diff --git a/CleanSpec.mk b/CleanSpec.mk
index ebe5f4a..6f6481f 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -80,3 +80,5 @@
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/recovery/root/)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/root/sbin/charger)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/recovery/root/sbin/charger)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/root/sbin)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/recovery/root/sbin)
diff --git a/adb/Android.bp b/adb/Android.bp
index 01e00dd..114eb2a 100644
--- a/adb/Android.bp
+++ b/adb/Android.bp
@@ -26,6 +26,7 @@
         "-Wvla",
         "-DADB_HOST=1",         // overridden by adbd_defaults
         "-DALLOW_ADBD_ROOT=0",  // overridden by adbd_defaults
+        "-DANDROID_BASE_UNIQUE_FD_DISABLE_IMPLICIT_CONVERSION=1",
     ],
     cpp_std: "experimental",
 
@@ -59,6 +60,9 @@
                 // MinGW hides some things behind _POSIX_SOURCE.
                 "-D_POSIX_SOURCE",
 
+                // libusb uses __stdcall on a variadic function, which gets ignored.
+                "-Wno-ignored-attributes",
+
                 // Not supported yet.
                 "-Wno-thread-safety",
             ],
@@ -506,6 +510,52 @@
 }
 
 cc_binary {
+    name: "static_adbd",
+    defaults: ["adbd_defaults", "host_adbd_supported"],
+
+    recovery_available: false,
+    static_executable: true,
+    host_supported: false,
+
+    srcs: [
+        "daemon/main.cpp",
+    ],
+
+    cflags: [
+        "-D_GNU_SOURCE",
+        "-Wno-deprecated-declarations",
+    ],
+
+    strip: {
+        keep_symbols: true,
+    },
+
+    static_libs: [
+        "libadbd",
+        "libadbd_services",
+        "libasyncio",
+        "libavb_user",
+        "libbase",
+        "libbootloader_message",
+        "libcap",
+        "libcrypto",
+        "libcrypto_utils",
+        "libcutils",
+        "libdiagnose_usb",
+        "libext4_utils",
+        "libfec",
+        "libfec_rs",
+        "libfs_mgr",
+        "liblog",
+        "liblp",
+        "libmdnssd",
+        "libminijail",
+        "libselinux",
+        "libsquashfs_utils",
+    ],
+}
+
+cc_binary {
     name: "abb",
 
     defaults: ["adbd_defaults"],
diff --git a/adb/adb.cpp b/adb/adb.cpp
index 050ba49..d5e7be1 100644
--- a/adb/adb.cpp
+++ b/adb/adb.cpp
@@ -1052,9 +1052,9 @@
         // New transport selection protocol:
         // This is essentially identical to the previous version, except it returns the selected
         // transport id to the caller as well.
-        if (ConsumePrefix(&service, "tport:")) {
+        if (android::base::ConsumePrefix(&service, "tport:")) {
             legacy = false;
-            if (ConsumePrefix(&service, "serial:")) {
+            if (android::base::ConsumePrefix(&service, "serial:")) {
                 serial_storage = service;
                 serial = serial_storage.c_str();
             } else if (service == "usb") {
@@ -1068,7 +1068,7 @@
             // Selection by id is unimplemented, since you obviously already know the transport id
             // you're connecting to.
         } else {
-            if (ConsumePrefix(&service, "transport-id:")) {
+            if (android::base::ConsumePrefix(&service, "transport-id:")) {
                 if (!ParseUint(&transport_id, service)) {
                     SendFail(reply_fd, "invalid transport id");
                     return HostRequestResult::Handled;
@@ -1079,7 +1079,7 @@
                 type = kTransportLocal;
             } else if (service == "transport-any") {
                 type = kTransportAny;
-            } else if (ConsumePrefix(&service, "transport:")) {
+            } else if (android::base::ConsumePrefix(&service, "transport:")) {
                 serial_storage = service;
                 serial = serial_storage.c_str();
             }
@@ -1220,7 +1220,7 @@
     }
 
     // Indicates a new emulator instance has started.
-    if (ConsumePrefix(&service, "emulator:")) {
+    if (android::base::ConsumePrefix(&service, "emulator:")) {
         unsigned int port;
         if (!ParseUint(&port, service)) {
           LOG(ERROR) << "received invalid port for emulator: " << service;
diff --git a/adb/adb_io.cpp b/adb/adb_io.cpp
index f5cdcb5..bdb8efa 100644
--- a/adb/adb_io.cpp
+++ b/adb/adb_io.cpp
@@ -34,7 +34,7 @@
 #include "adb_utils.h"
 #include "sysdeps.h"
 
-bool SendProtocolString(int fd, std::string_view s) {
+bool SendProtocolString(borrowed_fd fd, std::string_view s) {
     unsigned int length = s.size();
     if (length > MAX_PAYLOAD - 4) {
         errno = EMSGSIZE;
@@ -47,7 +47,7 @@
     return WriteFdExactly(fd, str);
 }
 
-bool ReadProtocolString(int fd, std::string* s, std::string* error) {
+bool ReadProtocolString(borrowed_fd fd, std::string* s, std::string* error) {
     char buf[5];
     if (!ReadFdExactly(fd, buf, 4)) {
         *error = perror_str("protocol fault (couldn't read status length)");
@@ -65,57 +65,57 @@
     return true;
 }
 
-bool SendOkay(int fd) {
+bool SendOkay(borrowed_fd fd) {
     return WriteFdExactly(fd, "OKAY", 4);
 }
 
-bool SendFail(int fd, std::string_view reason) {
+bool SendFail(borrowed_fd fd, std::string_view reason) {
     return WriteFdExactly(fd, "FAIL", 4) && SendProtocolString(fd, reason);
 }
 
-bool ReadFdExactly(int fd, void* buf, size_t len) {
+bool ReadFdExactly(borrowed_fd fd, void* buf, size_t len) {
     char* p = reinterpret_cast<char*>(buf);
 
     size_t len0 = len;
 
-    D("readx: fd=%d wanted=%zu", fd, len);
+    D("readx: fd=%d wanted=%zu", fd.get(), len);
     while (len > 0) {
         int r = adb_read(fd, p, len);
         if (r > 0) {
             len -= r;
             p += r;
         } else if (r == -1) {
-            D("readx: fd=%d error %d: %s", fd, errno, strerror(errno));
+            D("readx: fd=%d error %d: %s", fd.get(), errno, strerror(errno));
             return false;
         } else {
-            D("readx: fd=%d disconnected", fd);
+            D("readx: fd=%d disconnected", fd.get());
             errno = 0;
             return false;
         }
     }
 
-    VLOG(RWX) << "readx: fd=" << fd << " wanted=" << len0 << " got=" << (len0 - len)
-              << " " << dump_hex(reinterpret_cast<const unsigned char*>(buf), len0);
+    VLOG(RWX) << "readx: fd=" << fd.get() << " wanted=" << len0 << " got=" << (len0 - len) << " "
+              << dump_hex(reinterpret_cast<const unsigned char*>(buf), len0);
 
     return true;
 }
 
-bool WriteFdExactly(int fd, const void* buf, size_t len) {
+bool WriteFdExactly(borrowed_fd fd, const void* buf, size_t len) {
     const char* p = reinterpret_cast<const char*>(buf);
     int r;
 
-    VLOG(RWX) << "writex: fd=" << fd << " len=" << len
-              << " " << dump_hex(reinterpret_cast<const unsigned char*>(buf), len);
+    VLOG(RWX) << "writex: fd=" << fd.get() << " len=" << len << " "
+              << dump_hex(reinterpret_cast<const unsigned char*>(buf), len);
 
     while (len > 0) {
         r = adb_write(fd, p, len);
         if (r == -1) {
-            D("writex: fd=%d error %d: %s", fd, errno, strerror(errno));
+            D("writex: fd=%d error %d: %s", fd.get(), errno, strerror(errno));
             if (errno == EAGAIN) {
                 std::this_thread::yield();
                 continue;
             } else if (errno == EPIPE) {
-                D("writex: fd=%d disconnected", fd);
+                D("writex: fd=%d disconnected", fd.get());
                 errno = 0;
                 return false;
             } else {
@@ -129,15 +129,15 @@
     return true;
 }
 
-bool WriteFdExactly(int fd, const char* str) {
+bool WriteFdExactly(borrowed_fd fd, const char* str) {
     return WriteFdExactly(fd, str, strlen(str));
 }
 
-bool WriteFdExactly(int fd, const std::string& str) {
+bool WriteFdExactly(borrowed_fd fd, const std::string& str) {
     return WriteFdExactly(fd, str.c_str(), str.size());
 }
 
-bool WriteFdFmt(int fd, const char* fmt, ...) {
+bool WriteFdFmt(borrowed_fd fd, const char* fmt, ...) {
     std::string str;
 
     va_list ap;
@@ -148,7 +148,7 @@
     return WriteFdExactly(fd, str);
 }
 
-bool ReadOrderlyShutdown(int fd) {
+bool ReadOrderlyShutdown(borrowed_fd fd) {
     char buf[16];
 
     // Only call this function if you're sure that the peer does
@@ -178,7 +178,7 @@
         // data. We don't repeatedly call adb_read() until we get zero because
         // we don't know how long that would take, but we do know that the
         // caller wants to close the socket soon.
-        VLOG(RWX) << "ReadOrderlyShutdown(" << fd << ") unexpectedly read "
+        VLOG(RWX) << "ReadOrderlyShutdown(" << fd.get() << ") unexpectedly read "
                   << dump_hex(buf, result);
         // Shutdown the socket to prevent the caller from reading or writing to
         // it which doesn't make sense if we just read and discarded some data.
diff --git a/adb/adb_io.h b/adb/adb_io.h
index d6e65d8..9628946 100644
--- a/adb/adb_io.h
+++ b/adb/adb_io.h
@@ -25,16 +25,16 @@
 #include "adb_unique_fd.h"
 
 // Sends the protocol "OKAY" message.
-bool SendOkay(int fd);
+bool SendOkay(borrowed_fd fd);
 
 // Sends the protocol "FAIL" message, with the given failure reason.
-bool SendFail(int fd, std::string_view reason);
+bool SendFail(borrowed_fd fd, std::string_view reason);
 
 // Writes a protocol-format string; a four hex digit length followed by the string data.
-bool SendProtocolString(int fd, std::string_view s);
+bool SendProtocolString(borrowed_fd fd, std::string_view s);
 
 // Reads a protocol-format string; a four hex digit length followed by the string data.
-bool ReadProtocolString(int fd, std::string* s, std::string* error);
+bool ReadProtocolString(borrowed_fd fd, std::string* s, std::string* error);
 
 // Reads exactly len bytes from fd into buf.
 //
@@ -42,7 +42,7 @@
 // were read. If EOF was found, errno will be set to 0.
 //
 // If this function fails, the contents of buf are undefined.
-bool ReadFdExactly(int fd, void* buf, size_t len);
+bool ReadFdExactly(borrowed_fd fd, void* buf, size_t len);
 
 // Given a client socket, wait for orderly/graceful shutdown. Call this:
 //
@@ -60,19 +60,19 @@
 // connect()s from the client to fail with WSAEADDRINUSE on Windows.
 // Returns true if it is sure that orderly/graceful shutdown has occurred with
 // no additional data read from the server.
-bool ReadOrderlyShutdown(int fd);
+bool ReadOrderlyShutdown(borrowed_fd fd);
 
 // Writes exactly len bytes from buf to fd.
 //
 // Returns false if there is an error or if the fd was closed before the write
 // completed. If the other end of the fd (such as in a socket, pipe, or fifo),
 // is closed, errno will be set to 0.
-bool WriteFdExactly(int fd, const void* buf, size_t len);
+bool WriteFdExactly(borrowed_fd fd, const void* buf, size_t len);
 
 // Same as above, but for strings.
-bool WriteFdExactly(int fd, const char* s);
-bool WriteFdExactly(int fd, const std::string& s);
+bool WriteFdExactly(borrowed_fd fd, const char* s);
+bool WriteFdExactly(borrowed_fd fd, const std::string& s);
 
 // Same as above, but formats the string to send.
-bool WriteFdFmt(int fd, const char* fmt, ...) __attribute__((__format__(__printf__, 2, 3)));
+bool WriteFdFmt(borrowed_fd fd, const char* fmt, ...) __attribute__((__format__(__printf__, 2, 3)));
 #endif /* ADB_IO_H */
diff --git a/adb/adb_unique_fd.h b/adb/adb_unique_fd.h
index d47213d..b6c910a 100644
--- a/adb/adb_unique_fd.h
+++ b/adb/adb_unique_fd.h
@@ -32,6 +32,8 @@
 using unique_fd = android::base::unique_fd;
 #endif
 
+using android::base::borrowed_fd;
+
 template <typename T>
 int adb_close(const android::base::unique_fd_impl<T>&)
         __attribute__((__unavailable__("adb_close called on unique_fd")));
diff --git a/adb/adb_utils.cpp b/adb/adb_utils.cpp
index 9791769..cf5fbc8 100644
--- a/adb/adb_utils.cpp
+++ b/adb/adb_utils.cpp
@@ -234,15 +234,15 @@
 
 #if !defined(_WIN32)
 // Windows version provided in sysdeps_win32.cpp
-bool set_file_block_mode(int fd, bool block) {
-    int flags = fcntl(fd, F_GETFL, 0);
+bool set_file_block_mode(borrowed_fd fd, bool block) {
+    int flags = fcntl(fd.get(), F_GETFL, 0);
     if (flags == -1) {
-        PLOG(ERROR) << "failed to fcntl(F_GETFL) for fd " << fd;
+        PLOG(ERROR) << "failed to fcntl(F_GETFL) for fd " << fd.get();
         return false;
     }
     flags = block ? (flags & ~O_NONBLOCK) : (flags | O_NONBLOCK);
-    if (fcntl(fd, F_SETFL, flags) != 0) {
-        PLOG(ERROR) << "failed to fcntl(F_SETFL) for fd " << fd << ", flags " << flags;
+    if (fcntl(fd.get(), F_SETFL, flags) != 0) {
+        PLOG(ERROR) << "failed to fcntl(F_SETFL) for fd " << fd.get() << ", flags " << flags;
         return false;
     }
     return true;
diff --git a/adb/adb_utils.h b/adb/adb_utils.h
index 5800a62..faad03d 100644
--- a/adb/adb_utils.h
+++ b/adb/adb_utils.h
@@ -26,6 +26,7 @@
 #include <android-base/macros.h>
 
 #include "adb.h"
+#include "adb_unique_fd.h"
 
 void close_stdin();
 
@@ -51,7 +52,7 @@
 [[noreturn]] void error_exit(const char* fmt, ...) __attribute__((__format__(__printf__, 1, 2)));
 [[noreturn]] void perror_exit(const char* fmt, ...) __attribute__((__format__(__printf__, 1, 2)));
 
-bool set_file_block_mode(int fd, bool block);
+bool set_file_block_mode(borrowed_fd fd, bool block);
 
 // Given forward/reverse targets, returns true if they look sane. If an error is found, fills
 // |error| and returns false.
@@ -141,11 +142,3 @@
 
     return true;
 }
-
-inline bool ConsumePrefix(std::string_view* str, std::string_view prefix) {
-  if (str->starts_with(prefix)) {
-    str->remove_prefix(prefix.size());
-    return true;
-  }
-  return false;
-}
diff --git a/adb/adb_utils_test.cpp b/adb/adb_utils_test.cpp
index bd676c2..cdca3aa 100644
--- a/adb/adb_utils_test.cpp
+++ b/adb/adb_utils_test.cpp
@@ -149,13 +149,13 @@
 TEST(adb_utils, set_file_block_mode) {
     unique_fd fd(adb_open("/dev/null", O_RDWR | O_APPEND));
     ASSERT_GE(fd, 0);
-    int flags = fcntl(fd, F_GETFL, 0);
+    int flags = fcntl(fd.get(), F_GETFL, 0);
     ASSERT_EQ(O_RDWR | O_APPEND, (flags & (O_RDWR | O_APPEND)));
     ASSERT_TRUE(set_file_block_mode(fd, false));
-    int new_flags = fcntl(fd, F_GETFL, 0);
+    int new_flags = fcntl(fd.get(), F_GETFL, 0);
     ASSERT_EQ(flags | O_NONBLOCK, new_flags);
     ASSERT_TRUE(set_file_block_mode(fd, true));
-    new_flags = fcntl(fd, F_GETFL, 0);
+    new_flags = fcntl(fd.get(), F_GETFL, 0);
     ASSERT_EQ(flags, new_flags);
 }
 #endif
diff --git a/adb/client/adb_client.cpp b/adb/client/adb_client.cpp
index 5a7bc8d..7e408a8 100644
--- a/adb/client/adb_client.cpp
+++ b/adb/client/adb_client.cpp
@@ -128,7 +128,7 @@
     return result;
 }
 
-bool adb_status(int fd, std::string* error) {
+bool adb_status(borrowed_fd fd, std::string* error) {
     char buf[5];
     if (!ReadFdExactly(fd, buf, 4)) {
         *error = perror_str("protocol fault (couldn't read status)");
diff --git a/adb/client/adb_client.h b/adb/client/adb_client.h
index 8d32c93..fe1e584 100644
--- a/adb/client/adb_client.h
+++ b/adb/client/adb_client.h
@@ -16,13 +16,14 @@
 
 #pragma once
 
-#include "adb.h"
-#include "sysdeps.h"
-#include "transport.h"
-
 #include <optional>
 #include <string>
 
+#include "adb.h"
+#include "adb_unique_fd.h"
+#include "sysdeps.h"
+#include "transport.h"
+
 // Explicitly check the adb server version.
 // All of the commands below do this implicitly.
 // Only the first invocation of this function will check the server version.
@@ -64,7 +65,7 @@
 
 // Reads a standard adb status response (OKAY|FAIL) and returns true in the
 // event of OKAY, false in the event of FAIL or protocol error.
-bool adb_status(int fd, std::string* _Nonnull error);
+bool adb_status(borrowed_fd fd, std::string* _Nonnull error);
 
 // Create a host command corresponding to selected transport type/serial.
 std::string format_host_command(const char* _Nonnull command);
diff --git a/adb/client/auth.cpp b/adb/client/auth.cpp
index 3eee426..ed6a9a8 100644
--- a/adb/client/auth.cpp
+++ b/adb/client/auth.cpp
@@ -53,6 +53,25 @@
     *new std::map<std::string, std::shared_ptr<RSA>>;
 static std::map<int, std::string>& g_monitored_paths = *new std::map<int, std::string>;
 
+static std::string get_user_info() {
+    std::string hostname;
+    if (getenv("HOSTNAME")) hostname = getenv("HOSTNAME");
+#if !defined(_WIN32)
+    char buf[64];
+    if (hostname.empty() && gethostname(buf, sizeof(buf)) != -1) hostname = buf;
+#endif
+    if (hostname.empty()) hostname = "unknown";
+
+    std::string username;
+    if (getenv("LOGNAME")) username = getenv("LOGNAME");
+#if !defined(_WIN32)
+    if (username.empty() && getlogin()) username = getlogin();
+#endif
+    if (username.empty()) hostname = "unknown";
+
+    return " " + username + "@" + hostname;
+}
+
 static bool calculate_public_key(std::string* out, RSA* private_key) {
     uint8_t binary_key_data[ANDROID_PUBKEY_ENCODED_SIZE];
     if (!android_pubkey_encode(private_key, binary_key_data, sizeof(binary_key_data))) {
@@ -70,6 +89,7 @@
     size_t actual_length = EVP_EncodeBlock(reinterpret_cast<uint8_t*>(out->data()), binary_key_data,
                                            sizeof(binary_key_data));
     out->resize(actual_length);
+    out->append(get_user_info());
     return true;
 }
 
@@ -79,6 +99,7 @@
     mode_t old_mask;
     FILE *f = nullptr;
     int ret = 0;
+    std::string pubkey;
 
     EVP_PKEY* pkey = EVP_PKEY_new();
     BIGNUM* exponent = BN_new();
@@ -92,6 +113,11 @@
     RSA_generate_key_ex(rsa, 2048, exponent, nullptr);
     EVP_PKEY_set1_RSA(pkey, rsa);
 
+    if (!calculate_public_key(&pubkey, rsa)) {
+        LOG(ERROR) << "failed to calculate public key";
+        goto out;
+    }
+
     old_mask = umask(077);
 
     f = fopen(file.c_str(), "w");
@@ -104,7 +130,12 @@
     umask(old_mask);
 
     if (!PEM_write_PrivateKey(f, pkey, nullptr, nullptr, 0, nullptr, nullptr)) {
-        D("Failed to write key");
+        LOG(ERROR) << "Failed to write key";
+        goto out;
+    }
+
+    if (!android::base::WriteStringToFile(pubkey, file + ".pub")) {
+        PLOG(ERROR) << "failed to write public key";
         goto out;
     }
 
diff --git a/adb/client/commandline.cpp b/adb/client/commandline.cpp
index e2a17c5..728e5c1 100644
--- a/adb/client/commandline.cpp
+++ b/adb/client/commandline.cpp
@@ -170,9 +170,6 @@
         "     remove this app package from the device\n"
         "     '-k': keep the data and cache directories\n"
         "\n"
-        "backup/restore:\n"
-        "   to show usage run \"adb shell bu help\"\n"
-        "\n"
         "debugging:\n"
         " bugreport [PATH]\n"
         "     write bugreport to given PATH [default=bugreport.zip];\n"
@@ -262,7 +259,7 @@
 // stdout/stderr are routed independently and the remote exit code will be
 // returned.
 // if |callback| is non-null, stdout/stderr output will be handled by it.
-int read_and_dump(int fd, bool use_shell_protocol = false,
+int read_and_dump(borrowed_fd fd, bool use_shell_protocol = false,
                   StandardStreamsCallbackInterface* callback = &DEFAULT_STANDARD_STREAMS_CALLBACK) {
     int exit_code = 0;
     if (fd < 0) return exit_code;
@@ -305,9 +302,9 @@
             }
             length = protocol->data_length();
         } else {
-            D("read_and_dump(): pre adb_read(fd=%d)", fd);
+            D("read_and_dump(): pre adb_read(fd=%d)", fd.get());
             length = adb_read(fd, raw_buffer, sizeof(raw_buffer));
-            D("read_and_dump(): post adb_read(fd=%d): length=%d", fd, length);
+            D("read_and_dump(): post adb_read(fd=%d): length=%d", fd.get(), length);
             if (length <= 0) {
                 break;
             }
@@ -887,7 +884,7 @@
             return -1;
         }
         fprintf(stderr, "adb: trying pre-KitKat sideload method...\n");
-        return adb_sideload_legacy(filename, package_fd, static_cast<int>(sb.st_size));
+        return adb_sideload_legacy(filename, package_fd.get(), static_cast<int>(sb.st_size));
     }
 
     int opt = SIDELOAD_HOST_BLOCK_SIZE;
@@ -1142,7 +1139,7 @@
     // If we were using a specific transport ID, there's nothing we can wait for.
     if (previous_id == 0) {
         adb_set_transport(previous_type, previous_serial, 0);
-        wait_for_device("wait-for-device", 3000ms);
+        wait_for_device("wait-for-device", 6000ms);
     }
 
     return true;
@@ -1207,14 +1204,14 @@
     return send_shell_command(cmd);
 }
 
-static void write_zeros(int bytes, int fd) {
+static void write_zeros(int bytes, borrowed_fd fd) {
     int old_stdin_mode = -1;
     int old_stdout_mode = -1;
     std::vector<char> buf(bytes);
 
-    D("write_zeros(%d) -> %d", bytes, fd);
+    D("write_zeros(%d) -> %d", bytes, fd.get());
 
-    stdinout_raw_prologue(-1, fd, old_stdin_mode, old_stdout_mode);
+    stdinout_raw_prologue(-1, fd.get(), old_stdin_mode, old_stdout_mode);
 
     if (fd == STDOUT_FILENO) {
         fwrite(buf.data(), 1, bytes, stdout);
@@ -1223,12 +1220,14 @@
         adb_write(fd, buf.data(), bytes);
     }
 
-    stdinout_raw_prologue(-1, fd, old_stdin_mode, old_stdout_mode);
+    stdinout_raw_prologue(-1, fd.get(), old_stdin_mode, old_stdout_mode);
 
     D("write_zeros() finished");
 }
 
 static int backup(int argc, const char** argv) {
+    fprintf(stdout, "WARNING: adb backup is deprecated and may be removed in a future release\n");
+
     const char* filename = "backup.ab";
 
     /* find, extract, and use any -f argument */
@@ -1278,6 +1277,8 @@
 }
 
 static int restore(int argc, const char** argv) {
+    fprintf(stdout, "WARNING: adb restore is deprecated and may be removed in a future release\n");
+
     if (argc != 2) error_exit("restore requires an argument");
 
     const char* filename = argv[1];
diff --git a/adb/client/console.cpp b/adb/client/console.cpp
index 1dbb6e2..d10f4de 100644
--- a/adb/client/console.cpp
+++ b/adb/client/console.cpp
@@ -71,7 +71,7 @@
         return -1;
     }
 
-    int port;
+    int port = -1;
     size_t emulator_count = 0;
     for (const auto& device : android::base::Split(devices, "\n")) {
         if (sscanf(device.c_str(), "emulator-%d", &port) == 1) {
diff --git a/adb/daemon/abb.cpp b/adb/daemon/abb.cpp
index eeac41a..425438e 100644
--- a/adb/daemon/abb.cpp
+++ b/adb/daemon/abb.cpp
@@ -17,6 +17,7 @@
 #include <sys/wait.h>
 
 #include <android-base/cmsg.h>
+#include <android-base/strings.h>
 #include <cmd.h>
 
 #include "adb.h"
@@ -28,11 +29,11 @@
 
 class AdbFdTextOutput : public android::TextOutput {
   public:
-    explicit AdbFdTextOutput(int fd) : mFD(fd) {}
+    explicit AdbFdTextOutput(borrowed_fd fd) : fd_(fd) {}
 
   private:
     android::status_t print(const char* txt, size_t len) override {
-        return WriteFdExactly(mFD, txt, len) ? android::OK : -errno;
+        return WriteFdExactly(fd_, txt, len) ? android::OK : -errno;
     }
     void moveIndent(int delta) override { /*not implemented*/
     }
@@ -43,7 +44,7 @@
     }
 
   private:
-    int mFD;
+    borrowed_fd fd_;
 };
 
 std::vector<std::string_view> parseCmdArgs(std::string_view args) {
@@ -67,10 +68,11 @@
 
 }  // namespace
 
-static int execCmd(std::string_view args, int in, int out, int err) {
+static int execCmd(std::string_view args, borrowed_fd in, borrowed_fd out, borrowed_fd err) {
     AdbFdTextOutput oin(out);
     AdbFdTextOutput oerr(err);
-    return cmdMain(parseCmdArgs(args), oin, oerr, in, out, err, RunMode::kLibrary);
+    return cmdMain(parseCmdArgs(args), oin, oerr, in.get(), out.get(), err.get(),
+                   RunMode::kLibrary);
 }
 
 int main(int argc, char* const argv[]) {
@@ -87,9 +89,9 @@
 
         std::string_view name = data;
         auto protocol = SubprocessProtocol::kShell;
-        if (ConsumePrefix(&name, "abb:")) {
+        if (android::base::ConsumePrefix(&name, "abb:")) {
             protocol = SubprocessProtocol::kShell;
-        } else if (ConsumePrefix(&name, "abb_exec:")) {
+        } else if (android::base::ConsumePrefix(&name, "abb_exec:")) {
             protocol = SubprocessProtocol::kNone;
         } else {
             LOG(FATAL) << "Unknown command prefix for abb: " << data;
diff --git a/adb/daemon/file_sync_service.cpp b/adb/daemon/file_sync_service.cpp
index e82a51f..0e70d47 100644
--- a/adb/daemon/file_sync_service.cpp
+++ b/adb/daemon/file_sync_service.cpp
@@ -229,17 +229,13 @@
 static bool handle_send_file(int s, const char* path, uint32_t* timestamp, uid_t uid, gid_t gid,
                              uint64_t capabilities, mode_t mode, std::vector<char>& buffer,
                              bool do_unlink) {
+    int rc;
     syncmsg msg;
 
     __android_log_security_bswrite(SEC_TAG_ADB_SEND_FILE, path);
 
     unique_fd fd(adb_open_mode(path, O_WRONLY | O_CREAT | O_EXCL | O_CLOEXEC, mode));
 
-    if (posix_fadvise(fd, 0, 0, POSIX_FADV_SEQUENTIAL | POSIX_FADV_NOREUSE | POSIX_FADV_WILLNEED) <
-        0) {
-        D("[ Failed to fadvise: %d ]", errno);
-    }
-
     if (fd < 0 && errno == ENOENT) {
         if (!secure_mkdirs(Dirname(path))) {
             SendSyncFailErrno(s, "secure_mkdirs failed");
@@ -270,6 +266,12 @@
         fchmod(fd.get(), mode);
     }
 
+    rc = posix_fadvise(fd.get(), 0, 0,
+                       POSIX_FADV_SEQUENTIAL | POSIX_FADV_NOREUSE | POSIX_FADV_WILLNEED);
+    if (rc != 0) {
+        D("[ Failed to fadvise: %s ]", strerror(rc));
+    }
+
     while (true) {
         if (!ReadFdExactly(s, &msg.data, sizeof(msg.data))) goto fail;
 
@@ -464,8 +466,9 @@
         return false;
     }
 
-    if (posix_fadvise(fd.get(), 0, 0, POSIX_FADV_SEQUENTIAL | POSIX_FADV_NOREUSE) < 0) {
-        D("[ Failed to fadvise: %d ]", errno);
+    int rc = posix_fadvise(fd.get(), 0, 0, POSIX_FADV_SEQUENTIAL | POSIX_FADV_NOREUSE);
+    if (rc != 0) {
+        D("[ Failed to fadvise: %s ]", strerror(rc));
     }
 
     syncmsg msg;
diff --git a/adb/daemon/jdwp_service.cpp b/adb/daemon/jdwp_service.cpp
index 66bfc0d..cd9b669 100644
--- a/adb/daemon/jdwp_service.cpp
+++ b/adb/daemon/jdwp_service.cpp
@@ -325,12 +325,12 @@
 
     addrlen = pathlen + sizeof(addr.sun_family);
 
-    if (bind(s, reinterpret_cast<sockaddr*>(&addr), addrlen) < 0) {
+    if (bind(s.get(), reinterpret_cast<sockaddr*>(&addr), addrlen) < 0) {
         D("could not bind vm debug control socket: %d: %s", errno, strerror(errno));
         return -1;
     }
 
-    if (listen(s, 4) < 0) {
+    if (listen(s.get(), 4) < 0) {
         D("listen failed in jdwp control socket: %d: %s", errno, strerror(errno));
         return -1;
     }
diff --git a/adb/daemon/reboot_service.cpp b/adb/daemon/reboot_service.cpp
index a5a11b8..13398af 100644
--- a/adb/daemon/reboot_service.cpp
+++ b/adb/daemon/reboot_service.cpp
@@ -58,7 +58,7 @@
 
         sockaddr_un addr = {.sun_family = AF_UNIX};
         strncpy(addr.sun_path, "/dev/socket/recovery", sizeof(addr.sun_path) - 1);
-        if (connect(sock, reinterpret_cast<sockaddr*>(&addr), sizeof(addr)) == -1) {
+        if (connect(sock.get(), reinterpret_cast<sockaddr*>(&addr), sizeof(addr)) == -1) {
             WriteFdFmt(fd, "reboot (%s) connect\n", strerror(errno));
             PLOG(ERROR) << "Couldn't connect to recovery socket";
             return;
diff --git a/adb/daemon/services.cpp b/adb/daemon/services.cpp
index b0cc450..e6f4499 100644
--- a/adb/daemon/services.cpp
+++ b/adb/daemon/services.cpp
@@ -223,13 +223,13 @@
         return create_jdwp_service_socket();
     } else if (name == "track-jdwp") {
         return create_jdwp_tracker_service_socket();
-    } else if (ConsumePrefix(&name, "sink:")) {
+    } else if (android::base::ConsumePrefix(&name, "sink:")) {
         uint64_t byte_count = 0;
         if (!ParseUint(&byte_count, name)) {
             return nullptr;
         }
         return new SinkSocket(byte_count);
-    } else if (ConsumePrefix(&name, "source:")) {
+    } else if (android::base::ConsumePrefix(&name, "source:")) {
         uint64_t byte_count = 0;
         if (!ParseUint(&byte_count, name)) {
             return nullptr;
@@ -250,11 +250,11 @@
 #if defined(__ANDROID__)
     if (name.starts_with("framebuffer:")) {
         return create_service_thread("fb", framebuffer_service);
-    } else if (ConsumePrefix(&name, "remount:")) {
+    } else if (android::base::ConsumePrefix(&name, "remount:")) {
         std::string arg(name);
         return create_service_thread("remount",
                                      std::bind(remount_service, std::placeholders::_1, arg));
-    } else if (ConsumePrefix(&name, "reboot:")) {
+    } else if (android::base::ConsumePrefix(&name, "reboot:")) {
         std::string arg(name);
         return create_service_thread("reboot",
                                      std::bind(reboot_service, std::placeholders::_1, arg));
@@ -262,7 +262,7 @@
         return create_service_thread("root", restart_root_service);
     } else if (name.starts_with("unroot:")) {
         return create_service_thread("unroot", restart_unroot_service);
-    } else if (ConsumePrefix(&name, "backup:")) {
+    } else if (android::base::ConsumePrefix(&name, "backup:")) {
         std::string cmd = "/system/bin/bu backup ";
         cmd += name;
         return StartSubprocess(cmd, nullptr, SubprocessType::kRaw, SubprocessProtocol::kNone);
@@ -275,7 +275,7 @@
     } else if (name.starts_with("enable-verity:")) {
         return create_service_thread("verity-off", std::bind(set_verity_enabled_state_service,
                                                              std::placeholders::_1, true));
-    } else if (ConsumePrefix(&name, "tcpip:")) {
+    } else if (android::base::ConsumePrefix(&name, "tcpip:")) {
         std::string str(name);
 
         int port;
@@ -289,22 +289,22 @@
     }
 #endif
 
-    if (ConsumePrefix(&name, "dev:")) {
+    if (android::base::ConsumePrefix(&name, "dev:")) {
         return unique_fd{unix_open(name, O_RDWR | O_CLOEXEC)};
-    } else if (ConsumePrefix(&name, "jdwp:")) {
+    } else if (android::base::ConsumePrefix(&name, "jdwp:")) {
         pid_t pid;
         if (!ParseUint(&pid, name)) {
             return unique_fd{};
         }
         return create_jdwp_connection_fd(pid);
-    } else if (ConsumePrefix(&name, "shell")) {
+    } else if (android::base::ConsumePrefix(&name, "shell")) {
         return ShellService(name, transport);
-    } else if (ConsumePrefix(&name, "exec:")) {
+    } else if (android::base::ConsumePrefix(&name, "exec:")) {
         return StartSubprocess(std::string(name), nullptr, SubprocessType::kRaw,
                                SubprocessProtocol::kNone);
     } else if (name.starts_with("sync:")) {
         return create_service_thread("sync", file_sync_service);
-    } else if (ConsumePrefix(&name, "reverse:")) {
+    } else if (android::base::ConsumePrefix(&name, "reverse:")) {
         return reverse_service(name, transport);
     } else if (name == "reconnect") {
         return create_service_thread(
diff --git a/adb/daemon/set_verity_enable_state_service.cpp b/adb/daemon/set_verity_enable_state_service.cpp
index 889229f..4fbccdb 100644
--- a/adb/daemon/set_verity_enable_state_service.cpp
+++ b/adb/daemon/set_verity_enable_state_service.cpp
@@ -58,7 +58,7 @@
     }
 
     int OFF = 0;
-    bool result = (ioctl(fd, BLKROSET, &OFF) != -1);
+    bool result = (ioctl(fd.get(), BLKROSET, &OFF) != -1);
     return result;
 }
 
@@ -111,8 +111,11 @@
             WriteFdFmt(fd, "%s overlayfs for %s\n", enable ? "disabling" : "using", mount_point);
         }
     } else if (errno) {
-        WriteFdFmt(fd, "Overlayfs %s for %s failed with error %s\n", enable ? "teardown" : "setup",
-                   mount_point, strerror(errno));
+        int expected_errno = enable ? EBUSY : ENOENT;
+        if (errno != expected_errno) {
+            WriteFdFmt(fd, "Overlayfs %s for %s failed with error %s\n",
+                       enable ? "teardown" : "setup", mount_point, strerror(errno));
+        }
     }
     WriteFdFmt(fd, "Verity %s on %s\n", enable ? "enabled" : "disabled", mount_point);
     return true;
@@ -194,7 +197,7 @@
         }
 
         if (!android::base::GetBoolProperty("ro.secure", false)) {
-            overlayfs_setup(fd, enable);
+            overlayfs_setup(fd.get(), enable);
             WriteFdExactly(fd.get(), "verity not enabled - ENG build\n");
             return;
         }
@@ -239,7 +242,7 @@
             }
         }
     }
-    if (!any_changed) any_changed = overlayfs_setup(fd, enable);
+    if (!any_changed) any_changed = overlayfs_setup(fd.get(), enable);
 
     if (any_changed) {
         WriteFdExactly(fd.get(), "Now reboot your device for settings to take effect\n");
diff --git a/adb/daemon/shell_service.cpp b/adb/daemon/shell_service.cpp
index 3c8f393..de97068 100644
--- a/adb/daemon/shell_service.cpp
+++ b/adb/daemon/shell_service.cpp
@@ -114,7 +114,7 @@
 namespace {
 
 // Reads from |fd| until close or failure.
-std::string ReadAll(int fd) {
+std::string ReadAll(borrowed_fd fd) {
     char buffer[512];
     std::string received;
 
@@ -317,9 +317,10 @@
             child_stdinout_sfd.reset(OpenPtyChildFd(pts_name, &child_error_sfd));
         }
 
-        dup2(child_stdinout_sfd, STDIN_FILENO);
-        dup2(child_stdinout_sfd, STDOUT_FILENO);
-        dup2(child_stderr_sfd != -1 ? child_stderr_sfd : child_stdinout_sfd, STDERR_FILENO);
+        dup2(child_stdinout_sfd.get(), STDIN_FILENO);
+        dup2(child_stdinout_sfd.get(), STDOUT_FILENO);
+        dup2(child_stderr_sfd != -1 ? child_stderr_sfd.get() : child_stdinout_sfd.get(),
+             STDERR_FILENO);
 
         // exec doesn't trigger destructors, close the FDs manually.
         stdinout_sfd_.reset(-1);
@@ -415,7 +416,7 @@
         }
     } else {
         // Raw protocol doesn't support multiple output streams, so combine stdout and stderr.
-        child_stderr_sfd.reset(dup(child_stdinout_sfd));
+        child_stderr_sfd.reset(dup(child_stdinout_sfd.get()));
     }
 
     D("execinprocess: stdin/stdout FD = %d, stderr FD = %d", stdinout_sfd_.get(),
@@ -537,7 +538,7 @@
     FD_ZERO(&master_write_set);
     for (unique_fd* sfd : {&protocol_sfd_, &stdinout_sfd_, &stderr_sfd_}) {
         if (*sfd != -1) {
-            FD_SET(*sfd, &master_read_set);
+            FD_SET(sfd->get(), &master_read_set);
         }
     }
 
@@ -547,8 +548,8 @@
         unique_fd* dead_sfd = SelectLoop(&master_read_set, &master_write_set);
         if (dead_sfd) {
             D("closing FD %d", dead_sfd->get());
-            FD_CLR(*dead_sfd, &master_read_set);
-            FD_CLR(*dead_sfd, &master_write_set);
+            FD_CLR(dead_sfd->get(), &master_read_set);
+            FD_CLR(dead_sfd->get(), &master_write_set);
             if (dead_sfd == &protocol_sfd_) {
                 // Using SIGHUP is a decent general way to indicate that the
                 // controlling process is going away. If specific signals are
@@ -573,7 +574,7 @@
 namespace {
 
 inline bool ValidAndInSet(const unique_fd& sfd, fd_set* set) {
-    return sfd != -1 && FD_ISSET(sfd, set);
+    return sfd != -1 && FD_ISSET(sfd.get(), set);
 }
 
 }   // namespace
@@ -581,7 +582,8 @@
 unique_fd* Subprocess::SelectLoop(fd_set* master_read_set_ptr,
                                   fd_set* master_write_set_ptr) {
     fd_set read_set, write_set;
-    int select_n = std::max(std::max(protocol_sfd_, stdinout_sfd_), stderr_sfd_) + 1;
+    int select_n =
+            std::max(std::max(protocol_sfd_.get(), stdinout_sfd_.get()), stderr_sfd_.get()) + 1;
     unique_fd* dead_sfd = nullptr;
 
     // Keep calling select() and passing data until an FD closes/errors.
@@ -614,8 +616,8 @@
             dead_sfd = PassInput();
             // If we didn't finish writing, block on stdin write.
             if (input_bytes_left_) {
-                FD_CLR(protocol_sfd_, master_read_set_ptr);
-                FD_SET(stdinout_sfd_, master_write_set_ptr);
+                FD_CLR(protocol_sfd_.get(), master_read_set_ptr);
+                FD_SET(stdinout_sfd_.get(), master_write_set_ptr);
             }
         }
 
@@ -624,8 +626,8 @@
             dead_sfd = PassInput();
             // If we finished writing, go back to blocking on protocol read.
             if (!input_bytes_left_) {
-                FD_SET(protocol_sfd_, master_read_set_ptr);
-                FD_CLR(stdinout_sfd_, master_write_set_ptr);
+                FD_SET(protocol_sfd_.get(), master_read_set_ptr);
+                FD_CLR(stdinout_sfd_.get(), master_write_set_ptr);
             }
         }
     }  // while (!dead_sfd)
@@ -639,7 +641,7 @@
         if (!input_->Read()) {
             // Read() uses ReadFdExactly() which sets errno to 0 on EOF.
             if (errno != 0) {
-                PLOG(ERROR) << "error reading protocol FD " << protocol_sfd_;
+                PLOG(ERROR) << "error reading protocol FD " << protocol_sfd_.get();
             }
             return &protocol_sfd_;
         }
@@ -655,7 +657,7 @@
                         ws.ws_col = cols;
                         ws.ws_xpixel = x_pixels;
                         ws.ws_ypixel = y_pixels;
-                        ioctl(stdinout_sfd_, TIOCSWINSZ, &ws);
+                        ioctl(stdinout_sfd_.get(), TIOCSWINSZ, &ws);
                     }
                     break;
                 case ShellProtocol::kIdStdin:
@@ -666,8 +668,7 @@
                         if (adb_shutdown(stdinout_sfd_, SHUT_WR) == 0) {
                             return nullptr;
                         }
-                        PLOG(ERROR) << "failed to shutdown writes to FD "
-                                    << stdinout_sfd_;
+                        PLOG(ERROR) << "failed to shutdown writes to FD " << stdinout_sfd_.get();
                         return &stdinout_sfd_;
                     } else {
                         // PTYs can't close just input, so rather than close the
@@ -688,7 +689,7 @@
         int bytes = adb_write(stdinout_sfd_, input_->data() + index, input_bytes_left_);
         if (bytes == 0 || (bytes < 0 && errno != EAGAIN)) {
             if (bytes < 0) {
-                PLOG(ERROR) << "error reading stdin FD " << stdinout_sfd_;
+                PLOG(ERROR) << "error reading stdin FD " << stdinout_sfd_.get();
             }
             // stdin is done, mark this packet as finished and we'll just start
             // dumping any further data received from the protocol FD.
@@ -708,14 +709,14 @@
         // read() returns EIO if a PTY closes; don't report this as an error,
         // it just means the subprocess completed.
         if (bytes < 0 && !(type_ == SubprocessType::kPty && errno == EIO)) {
-            PLOG(ERROR) << "error reading output FD " << *sfd;
+            PLOG(ERROR) << "error reading output FD " << sfd->get();
         }
         return sfd;
     }
 
     if (bytes > 0 && !output_->Write(id, bytes)) {
         if (errno != 0) {
-            PLOG(ERROR) << "error reading protocol FD " << protocol_sfd_;
+            PLOG(ERROR) << "error reading protocol FD " << protocol_sfd_.get();
         }
         return &protocol_sfd_;
     }
diff --git a/adb/daemon/shell_service.h b/adb/daemon/shell_service.h
index 3abd958..030228c 100644
--- a/adb/daemon/shell_service.h
+++ b/adb/daemon/shell_service.h
@@ -48,7 +48,7 @@
 // Sets up in/out and error streams to emulate shell-like behavior.
 //
 // Returns an open FD connected to the thread or -1 on failure.
-using Command = int(std::string_view args, int in, int out, int err);
+using Command = int(std::string_view args, borrowed_fd in, borrowed_fd out, borrowed_fd err);
 unique_fd StartCommandInProcess(std::string name, Command command, SubprocessProtocol protocol);
 
 // Create a pipe containing the error.
diff --git a/adb/daemon/shell_service_test.cpp b/adb/daemon/shell_service_test.cpp
index dc79d12..cdd8dbe 100644
--- a/adb/daemon/shell_service_test.cpp
+++ b/adb/daemon/shell_service_test.cpp
@@ -77,7 +77,7 @@
 namespace {
 
 // Reads raw data from |fd| until it closes or errors.
-std::string ReadRaw(int fd) {
+std::string ReadRaw(borrowed_fd fd) {
     char buffer[1024];
     char *cur_ptr = buffer, *end_ptr = buffer + sizeof(buffer);
 
@@ -93,12 +93,12 @@
 // Reads shell protocol data from |fd| until it closes or errors. Fills
 // |stdout| and |stderr| with their respective data, and returns the exit code
 // read from the protocol or -1 if an exit code packet was not received.
-int ReadShellProtocol(int fd, std::string* stdout, std::string* stderr) {
+int ReadShellProtocol(borrowed_fd fd, std::string* stdout, std::string* stderr) {
     int exit_code = -1;
     stdout->clear();
     stderr->clear();
 
-    auto protocol = std::make_unique<ShellProtocol>(fd);
+    auto protocol = std::make_unique<ShellProtocol>(fd.get());
     while (protocol->Read()) {
         switch (protocol->id()) {
             case ShellProtocol::kIdStdout:
diff --git a/adb/fastdeploy/deployagent/deployagent.sh b/adb/fastdeploy/deployagent/deployagent.sh
index 4f17eb7..91576ca 100755
--- a/adb/fastdeploy/deployagent/deployagent.sh
+++ b/adb/fastdeploy/deployagent/deployagent.sh
@@ -1,7 +1,4 @@
-# Script to start "deployagent" on the device, which has a very rudimentary
-# shell.
-#
+#!/system/bin/sh
 base=/data/local/tmp
 export CLASSPATH=$base/deployagent.jar
 exec app_process $base com.android.fastdeploy.DeployAgent "$@"
-
diff --git a/adb/services.cpp b/adb/services.cpp
index 335ffc4..6185aa6 100644
--- a/adb/services.cpp
+++ b/adb/services.cpp
@@ -100,7 +100,7 @@
     ConnectionState state;
 };
 
-static void wait_for_state(int fd, state_info* sinfo) {
+static void wait_for_state(unique_fd fd, state_info* sinfo) {
     D("wait_for_state %d", sinfo->state);
 
     while (true) {
@@ -122,7 +122,7 @@
         }
 
         if (!is_ambiguous) {
-            adb_pollfd pfd = {.fd = fd, .events = POLLIN};
+            adb_pollfd pfd = {.fd = fd.get(), .events = POLLIN};
             int rc = adb_poll(&pfd, 1, 100);
             if (rc < 0) {
                 SendFail(fd, error);
@@ -140,7 +140,6 @@
         }
     }
 
-    adb_close(fd);
     D("wait_for_state is done");
 }
 
@@ -203,7 +202,7 @@
         return create_device_tracker(false);
     } else if (name == "track-devices-l") {
         return create_device_tracker(true);
-    } else if (ConsumePrefix(&name, "wait-for-")) {
+    } else if (android::base::ConsumePrefix(&name, "wait-for-")) {
         std::shared_ptr<state_info> sinfo = std::make_shared<state_info>();
         if (sinfo == nullptr) {
             fprintf(stderr, "couldn't allocate state_info: %s", strerror(errno));
@@ -213,11 +212,11 @@
         sinfo->serial = serial;
         sinfo->transport_id = transport_id;
 
-        if (ConsumePrefix(&name, "local")) {
+        if (android::base::ConsumePrefix(&name, "local")) {
             sinfo->transport_type = kTransportLocal;
-        } else if (ConsumePrefix(&name, "usb")) {
+        } else if (android::base::ConsumePrefix(&name, "usb")) {
             sinfo->transport_type = kTransportUsb;
-        } else if (ConsumePrefix(&name, "any")) {
+        } else if (android::base::ConsumePrefix(&name, "any")) {
             sinfo->transport_type = kTransportAny;
         } else {
             return nullptr;
@@ -241,11 +240,10 @@
             return nullptr;
         }
 
-        unique_fd fd = create_service_thread("wait", [sinfo](int fd) {
-            wait_for_state(fd, sinfo.get());
-        });
+        unique_fd fd = create_service_thread(
+                "wait", [sinfo](unique_fd fd) { wait_for_state(std::move(fd), sinfo.get()); });
         return create_local_socket(std::move(fd));
-    } else if (ConsumePrefix(&name, "connect:")) {
+    } else if (android::base::ConsumePrefix(&name, "connect:")) {
         std::string host(name);
         unique_fd fd = create_service_thread(
                 "connect", std::bind(connect_service, std::placeholders::_1, host));
diff --git a/adb/shell_protocol.h b/adb/shell_protocol.h
index 2c82689..4aab813 100644
--- a/adb/shell_protocol.h
+++ b/adb/shell_protocol.h
@@ -21,6 +21,7 @@
 #include <android-base/macros.h>
 
 #include "adb.h"
+#include "adb_unique_fd.h"
 
 // Class to send and receive shell protocol packets.
 //
@@ -60,7 +61,7 @@
     // should be dynamically allocated on the heap instead.
     //
     // |fd| is an open file descriptor to be used to send or receive packets.
-    explicit ShellProtocol(int fd);
+    explicit ShellProtocol(borrowed_fd fd);
     virtual ~ShellProtocol();
 
     // Returns a pointer to the data buffer.
@@ -103,7 +104,7 @@
         kHeaderSize = sizeof(Id) + sizeof(length_t)
     };
 
-    int fd_;
+    borrowed_fd fd_;
     char buffer_[kBufferSize];
     size_t data_length_ = 0, bytes_left_ = 0;
 
diff --git a/adb/shell_service_protocol.cpp b/adb/shell_service_protocol.cpp
index 13b66ec..95afaff 100644
--- a/adb/shell_service_protocol.cpp
+++ b/adb/shell_service_protocol.cpp
@@ -22,7 +22,7 @@
 
 #include "adb_io.h"
 
-ShellProtocol::ShellProtocol(int fd) : fd_(fd) {
+ShellProtocol::ShellProtocol(borrowed_fd fd) : fd_(fd) {
     buffer_[0] = kIdInvalid;
 }
 
diff --git a/adb/socket_spec.cpp b/adb/socket_spec.cpp
index de4fff9..1333724 100644
--- a/adb/socket_spec.cpp
+++ b/adb/socket_spec.cpp
@@ -314,14 +314,14 @@
         addr.svm_port = port == 0 ? VMADDR_PORT_ANY : port;
         addr.svm_cid = VMADDR_CID_ANY;
         socklen_t addr_len = sizeof(addr);
-        if (bind(serverfd, reinterpret_cast<struct sockaddr*>(&addr), addr_len)) {
+        if (bind(serverfd.get(), reinterpret_cast<struct sockaddr*>(&addr), addr_len)) {
             return -1;
         }
-        if (listen(serverfd, 4)) {
+        if (listen(serverfd.get(), 4)) {
             return -1;
         }
         if (serverfd >= 0 && resolved_port) {
-            if (getsockname(serverfd, reinterpret_cast<sockaddr*>(&addr), &addr_len) == 0) {
+            if (getsockname(serverfd.get(), reinterpret_cast<sockaddr*>(&addr), &addr_len) == 0) {
                 *resolved_port = addr.svm_port;
             } else {
                 return -1;
diff --git a/adb/sockets.cpp b/adb/sockets.cpp
index 8a2bf9a..75993b3 100644
--- a/adb/sockets.cpp
+++ b/adb/sockets.cpp
@@ -31,6 +31,8 @@
 #include <string>
 #include <vector>
 
+#include <android-base/strings.h>
+
 #if !ADB_HOST
 #include <android-base/properties.h>
 #include <log/log_properties.h>
@@ -755,26 +757,26 @@
 
 #if ADB_HOST
     service = std::string_view(s->smart_socket_data).substr(4);
-    if (ConsumePrefix(&service, "host-serial:")) {
+    if (android::base::ConsumePrefix(&service, "host-serial:")) {
         // serial number should follow "host:" and could be a host:port string.
         if (!internal::parse_host_service(&serial, &service, service)) {
             LOG(ERROR) << "SS(" << s->id << "): failed to parse host service: " << service;
             goto fail;
         }
-    } else if (ConsumePrefix(&service, "host-transport-id:")) {
+    } else if (android::base::ConsumePrefix(&service, "host-transport-id:")) {
         if (!ParseUint(&transport_id, service, &service)) {
             LOG(ERROR) << "SS(" << s->id << "): failed to parse host transport id: " << service;
             return -1;
         }
-        if (!ConsumePrefix(&service, ":")) {
+        if (!android::base::ConsumePrefix(&service, ":")) {
             LOG(ERROR) << "SS(" << s->id << "): host-transport-id without command";
             return -1;
         }
-    } else if (ConsumePrefix(&service, "host-usb:")) {
+    } else if (android::base::ConsumePrefix(&service, "host-usb:")) {
         type = kTransportUsb;
-    } else if (ConsumePrefix(&service, "host-local:")) {
+    } else if (android::base::ConsumePrefix(&service, "host-local:")) {
         type = kTransportLocal;
-    } else if (ConsumePrefix(&service, "host:")) {
+    } else if (android::base::ConsumePrefix(&service, "host:")) {
         type = kTransportAny;
     } else {
         service = std::string_view{};
diff --git a/adb/sysdeps.h b/adb/sysdeps.h
index 15247e7..78abba5 100644
--- a/adb/sysdeps.h
+++ b/adb/sysdeps.h
@@ -36,6 +36,7 @@
 #include <android-base/unique_fd.h>
 #include <android-base/utf8.h>
 
+#include "adb_unique_fd.h"
 #include "sysdeps/errno.h"
 #include "sysdeps/network.h"
 #include "sysdeps/stat.h"
@@ -76,42 +77,40 @@
 
 extern int adb_thread_setname(const std::string& name);
 
-static __inline__ void  close_on_exec(int  fd)
-{
+static __inline__ void close_on_exec(borrowed_fd fd) {
     /* nothing really */
 }
 
-extern int  adb_unlink(const char*  path);
-#undef  unlink
-#define unlink  ___xxx_unlink
+extern int adb_unlink(const char* path);
+#undef unlink
+#define unlink ___xxx_unlink
 
 extern int adb_mkdir(const std::string& path, int mode);
-#undef   mkdir
-#define  mkdir  ___xxx_mkdir
+#undef mkdir
+#define mkdir ___xxx_mkdir
 
 // See the comments for the !defined(_WIN32) versions of adb_*().
 extern int adb_open(const char* path, int options);
 extern int adb_creat(const char* path, int mode);
-extern int adb_read(int fd, void* buf, int len);
-extern int adb_write(int fd, const void* buf, int len);
-extern int64_t adb_lseek(int fd, int64_t pos, int where);
-extern int adb_shutdown(int fd, int direction = SHUT_RDWR);
+extern int adb_read(borrowed_fd fd, void* buf, int len);
+extern int adb_write(borrowed_fd fd, const void* buf, int len);
+extern int64_t adb_lseek(borrowed_fd fd, int64_t pos, int where);
+extern int adb_shutdown(borrowed_fd fd, int direction = SHUT_RDWR);
 extern int adb_close(int fd);
 extern int adb_register_socket(SOCKET s);
 
 // See the comments for the !defined(_WIN32) version of unix_close().
-static __inline__ int  unix_close(int fd)
-{
+static __inline__ int unix_close(int fd) {
     return close(fd);
 }
-#undef   close
-#define  close   ____xxx_close
+#undef close
+#define close ____xxx_close
 
 // Like unix_read(), but may return EINTR.
-extern int  unix_read_interruptible(int  fd, void*  buf, size_t  len);
+extern int unix_read_interruptible(borrowed_fd fd, void* buf, size_t len);
 
 // See the comments for the !defined(_WIN32) version of unix_read().
-static __inline__ int unix_read(int fd, void* buf, size_t len) {
+static __inline__ int unix_read(borrowed_fd fd, void* buf, size_t len) {
     return TEMP_FAILURE_RETRY(unix_read_interruptible(fd, buf, len));
 }
 
@@ -119,23 +118,21 @@
 #define  read  ___xxx_read
 
 // See the comments for the !defined(_WIN32) version of unix_write().
-static __inline__  int  unix_write(int  fd, const void*  buf, size_t  len)
-{
-    return write(fd, buf, len);
+static __inline__ int unix_write(borrowed_fd fd, const void* buf, size_t len) {
+    return write(fd.get(), buf, len);
 }
 #undef   write
 #define  write  ___xxx_write
 
 // See the comments for the !defined(_WIN32) version of unix_lseek().
-static __inline__ int unix_lseek(int fd, int pos, int where) {
-    return lseek(fd, pos, where);
+static __inline__ int unix_lseek(borrowed_fd fd, int pos, int where) {
+    return lseek(fd.get(), pos, where);
 }
 #undef lseek
 #define lseek ___xxx_lseek
 
 // See the comments for the !defined(_WIN32) version of adb_open_mode().
-static __inline__ int  adb_open_mode(const char* path, int options, int mode)
-{
+static __inline__ int adb_open_mode(const char* path, int options, int mode) {
     return adb_open(path, options);
 }
 
@@ -152,7 +149,7 @@
 // with |fd| must have GENERIC_READ access (which console FDs have by default).
 // Returns 1 if |fd| is a console FD, 0 otherwise. The value of errno after
 // calling this function is unreliable and should not be used.
-int unix_isatty(int fd);
+int unix_isatty(borrowed_fd fd);
 #define  isatty  ___xxx_isatty
 
 int network_inaddr_any_server(int port, int type, std::string* error);
@@ -168,20 +165,21 @@
 int network_connect(const std::string& host, int port, int type, int timeout,
                     std::string* error);
 
-extern int  adb_socket_accept(int  serverfd, struct sockaddr*  addr, socklen_t  *addrlen);
+extern int adb_socket_accept(borrowed_fd serverfd, struct sockaddr* addr, socklen_t* addrlen);
 
 #undef   accept
 #define  accept  ___xxx_accept
 
 // Returns the local port number of a bound socket, or -1 on failure.
-int adb_socket_get_local_port(int fd);
+int adb_socket_get_local_port(borrowed_fd fd);
 
-extern int  adb_setsockopt(int  fd, int  level, int  optname, const void*  optval, socklen_t  optlen);
+extern int adb_setsockopt(borrowed_fd fd, int level, int optname, const void* optval,
+                          socklen_t optlen);
 
 #undef   setsockopt
 #define  setsockopt  ___xxx_setsockopt
 
-extern int  adb_socketpair( int  sv[2] );
+extern int adb_socketpair(int sv[2]);
 
 struct adb_pollfd {
     int fd;
@@ -214,8 +212,7 @@
 extern int adb_fputc(int ch, FILE* stream);
 extern int adb_putchar(int ch);
 extern int adb_puts(const char* buf);
-extern size_t adb_fwrite(const void* ptr, size_t size, size_t nmemb,
-                         FILE* stream);
+extern size_t adb_fwrite(const void* ptr, size_t size, size_t nmemb, FILE* stream);
 
 extern FILE* adb_fopen(const char* f, const char* m);
 
@@ -344,9 +341,8 @@
     return c == '/';
 }
 
-static __inline__ void  close_on_exec(int  fd)
-{
-    fcntl( fd, F_SETFD, FD_CLOEXEC );
+static __inline__ void close_on_exec(borrowed_fd fd) {
+    fcntl(fd.get(), F_SETFD, FD_CLOEXEC);
 }
 
 // Open a file and return a file descriptor that may be used with unix_read(),
@@ -374,12 +370,10 @@
 
 // Similar to the two-argument adb_open(), but takes a mode parameter for file
 // creation. See adb_open() for more info.
-static __inline__ int  adb_open_mode( const char*  pathname, int  options, int  mode )
-{
-    return TEMP_FAILURE_RETRY( open( pathname, options, mode ) );
+static __inline__ int adb_open_mode(const char* pathname, int options, int mode) {
+    return TEMP_FAILURE_RETRY(open(pathname, options, mode));
 }
 
-
 // Open a file and return a file descriptor that may be used with adb_read(),
 // adb_write(), adb_close(), but not unix_read(), unix_write(), unix_close().
 //
@@ -387,23 +381,21 @@
 // sysdeps_win32.cpp) uses Windows native file I/O and bypasses the C Runtime
 // and its CR/LF translation. The returned file descriptor should be used with
 // adb_read(), adb_write(), adb_close(), etc.
-static __inline__ int  adb_open( const char*  pathname, int  options )
-{
-    int  fd = TEMP_FAILURE_RETRY( open( pathname, options ) );
-    if (fd < 0)
-        return -1;
-    close_on_exec( fd );
+static __inline__ int adb_open(const char* pathname, int options) {
+    int fd = TEMP_FAILURE_RETRY(open(pathname, options));
+    if (fd < 0) return -1;
+    close_on_exec(fd);
     return fd;
 }
-#undef   open
-#define  open    ___xxx_open
+#undef open
+#define open ___xxx_open
 
-static __inline__ int adb_shutdown(int fd, int direction = SHUT_RDWR) {
-    return shutdown(fd, direction);
+static __inline__ int adb_shutdown(borrowed_fd fd, int direction = SHUT_RDWR) {
+    return shutdown(fd.get(), direction);
 }
 
-#undef   shutdown
-#define  shutdown   ____xxx_shutdown
+#undef shutdown
+#define shutdown ____xxx_shutdown
 
 // Closes a file descriptor that came from adb_open() or adb_open_mode(), but
 // not designed to take a file descriptor from unix_open(). See the comments
@@ -411,81 +403,76 @@
 __inline__ int adb_close(int fd) {
     return close(fd);
 }
-#undef   close
-#define  close   ____xxx_close
+#undef close
+#define close ____xxx_close
 
 // On Windows, ADB has an indirection layer for file descriptors. If we get a
 // Win32 SOCKET object from an external library, we have to map it in to that
 // indirection layer, which this does.
-__inline__ int  adb_register_socket(int s) {
+__inline__ int adb_register_socket(int s) {
     return s;
 }
 
-static __inline__  int  adb_read(int  fd, void*  buf, size_t  len)
-{
-    return TEMP_FAILURE_RETRY( read( fd, buf, len ) );
+static __inline__ int adb_read(borrowed_fd fd, void* buf, size_t len) {
+    return TEMP_FAILURE_RETRY(read(fd.get(), buf, len));
 }
 
 // Like unix_read(), but does not handle EINTR.
-static __inline__ int unix_read_interruptible(int fd, void* buf, size_t len) {
-    return read(fd, buf, len);
+static __inline__ int unix_read_interruptible(borrowed_fd fd, void* buf, size_t len) {
+    return read(fd.get(), buf, len);
 }
 
-#undef   read
-#define  read  ___xxx_read
+#undef read
+#define read ___xxx_read
 
-static __inline__  int  adb_write(int  fd, const void*  buf, size_t  len)
-{
-    return TEMP_FAILURE_RETRY( write( fd, buf, len ) );
+static __inline__ int adb_write(borrowed_fd fd, const void* buf, size_t len) {
+    return TEMP_FAILURE_RETRY(write(fd.get(), buf, len));
 }
 #undef   write
 #define  write  ___xxx_write
 
-static __inline__ int64_t adb_lseek(int fd, int64_t pos, int where) {
+static __inline__ int64_t adb_lseek(borrowed_fd fd, int64_t pos, int where) {
 #if defined(__APPLE__)
-    return lseek(fd, pos, where);
+    return lseek(fd.get(), pos, where);
 #else
-    return lseek64(fd, pos, where);
+    return lseek64(fd.get(), pos, where);
 #endif
 }
 #undef lseek
 #define lseek ___xxx_lseek
 
-static __inline__  int    adb_unlink(const char*  path)
-{
-    return  unlink(path);
+static __inline__ int adb_unlink(const char* path) {
+    return unlink(path);
 }
-#undef  unlink
-#define unlink  ___xxx_unlink
+#undef unlink
+#define unlink ___xxx_unlink
 
-static __inline__  int  adb_creat(const char*  path, int  mode)
-{
-    int  fd = TEMP_FAILURE_RETRY( creat( path, mode ) );
+static __inline__ int adb_creat(const char* path, int mode) {
+    int fd = TEMP_FAILURE_RETRY(creat(path, mode));
 
-    if ( fd < 0 )
-        return -1;
+    if (fd < 0) return -1;
 
     close_on_exec(fd);
     return fd;
 }
-#undef   creat
-#define  creat  ___xxx_creat
+#undef creat
+#define creat ___xxx_creat
 
-static __inline__ int unix_isatty(int fd) {
-    return isatty(fd);
+static __inline__ int unix_isatty(borrowed_fd fd) {
+    return isatty(fd.get());
 }
-#define  isatty  ___xxx_isatty
+#define isatty ___xxx_isatty
 
 // Helper for network_* functions.
 inline int _fd_set_error_str(int fd, std::string* error) {
-  if (fd == -1) {
-    *error = strerror(errno);
-  }
-  return fd;
+    if (fd == -1) {
+        *error = strerror(errno);
+    }
+    return fd;
 }
 
 inline int network_inaddr_any_server(int port, int type, std::string* error) {
-  return _fd_set_error_str(socket_inaddr_any_server(port, type), error);
+    return _fd_set_error_str(socket_inaddr_any_server(port, type), error);
 }
 
 inline int network_local_client(const char* name, int namespace_id, int type, std::string* error) {
@@ -498,22 +485,21 @@
 
 int network_connect(const std::string& host, int port, int type, int timeout, std::string* error);
 
-static __inline__ int  adb_socket_accept(int  serverfd, struct sockaddr*  addr, socklen_t  *addrlen)
-{
+static __inline__ int adb_socket_accept(borrowed_fd serverfd, struct sockaddr* addr,
+                                        socklen_t* addrlen) {
     int fd;
 
-    fd = TEMP_FAILURE_RETRY( accept( serverfd, addr, addrlen ) );
-    if (fd >= 0)
-        close_on_exec(fd);
+    fd = TEMP_FAILURE_RETRY(accept(serverfd.get(), addr, addrlen));
+    if (fd >= 0) close_on_exec(fd);
 
     return fd;
 }
 
-#undef   accept
-#define  accept  ___xxx_accept
+#undef accept
+#define accept ___xxx_accept
 
-inline int adb_socket_get_local_port(int fd) {
-    return socket_get_local_port(fd);
+inline int adb_socket_get_local_port(borrowed_fd fd) {
+    return socket_get_local_port(fd.get());
 }
 
 // Operate on a file descriptor returned from unix_open() or a well-known file
@@ -524,10 +510,10 @@
 // Windows implementations (in the ifdef above and in sysdeps_win32.cpp) call
 // into the C Runtime and its configurable CR/LF translation (which is settable
 // via _setmode()).
-#define  unix_read   adb_read
-#define  unix_write  adb_write
+#define unix_read adb_read
+#define unix_write adb_write
 #define unix_lseek adb_lseek
-#define  unix_close  adb_close
+#define unix_close adb_close
 
 static __inline__ int adb_thread_setname(const std::string& name) {
 #ifdef __APPLE__
@@ -542,34 +528,31 @@
 #endif
 }
 
-static __inline__ int  adb_setsockopt( int  fd, int  level, int  optname, const void*  optval, socklen_t  optlen )
-{
-    return setsockopt( fd, level, optname, optval, optlen );
+static __inline__ int adb_setsockopt(borrowed_fd fd, int level, int optname, const void* optval,
+                                     socklen_t optlen) {
+    return setsockopt(fd.get(), level, optname, optval, optlen);
 }
 
-#undef   setsockopt
-#define  setsockopt  ___xxx_setsockopt
+#undef setsockopt
+#define setsockopt ___xxx_setsockopt
 
-static __inline__ int  unix_socketpair( int  d, int  type, int  protocol, int sv[2] )
-{
-    return socketpair( d, type, protocol, sv );
+static __inline__ int unix_socketpair(int d, int type, int protocol, int sv[2]) {
+    return socketpair(d, type, protocol, sv);
 }
 
-static __inline__ int  adb_socketpair( int  sv[2] )
-{
-    int  rc;
+static __inline__ int adb_socketpair(int sv[2]) {
+    int rc;
 
-    rc = unix_socketpair( AF_UNIX, SOCK_STREAM, 0, sv );
-    if (rc < 0)
-        return -1;
+    rc = unix_socketpair(AF_UNIX, SOCK_STREAM, 0, sv);
+    if (rc < 0) return -1;
 
-    close_on_exec( sv[0] );
-    close_on_exec( sv[1] );
+    close_on_exec(sv[0]);
+    close_on_exec(sv[1]);
     return 0;
 }
 
-#undef   socketpair
-#define  socketpair   ___xxx_socketpair
+#undef socketpair
+#define socketpair ___xxx_socketpair
 
 typedef struct pollfd adb_pollfd;
 static __inline__ int adb_poll(adb_pollfd* fds, size_t nfds, int timeout) {
@@ -578,13 +561,12 @@
 
 #define poll ___xxx_poll
 
-static __inline__ int  adb_mkdir(const std::string& path, int mode)
-{
+static __inline__ int adb_mkdir(const std::string& path, int mode) {
     return mkdir(path.c_str(), mode);
 }
 
-#undef   mkdir
-#define  mkdir  ___xxx_mkdir
+#undef mkdir
+#define mkdir ___xxx_mkdir
 
 static __inline__ int adb_is_absolute_host_path(const char* path) {
     return path[0] == '/';
@@ -592,15 +574,15 @@
 
 #endif /* !_WIN32 */
 
-static inline void disable_tcp_nagle(int fd) {
+static inline void disable_tcp_nagle(borrowed_fd fd) {
     int off = 1;
-    adb_setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &off, sizeof(off));
+    adb_setsockopt(fd.get(), IPPROTO_TCP, TCP_NODELAY, &off, sizeof(off));
 }
 
 // Sets TCP socket |fd| to send a keepalive TCP message every |interval_sec| seconds. Set
 // |interval_sec| to 0 to disable keepalives. If keepalives are enabled, the connection will be
 // configured to drop after 10 missed keepalives. Returns true on success.
-bool set_tcp_keepalive(int fd, int interval_sec);
+bool set_tcp_keepalive(borrowed_fd fd, int interval_sec);
 
 #if defined(_WIN32)
 // Win32 defines ERROR, which we don't need, but which conflicts with google3 logging.
diff --git a/adb/sysdeps/posix/network.cpp b/adb/sysdeps/posix/network.cpp
index 4de240e..c5c2275 100644
--- a/adb/sysdeps/posix/network.cpp
+++ b/adb/sysdeps/posix/network.cpp
@@ -104,13 +104,13 @@
     socklen_t addrlen = sizeof(addr_storage);
     sockaddr* addr = (ipv6 ? loopback_addr6 : loopback_addr4)(&addr_storage, &addrlen, port);
 
-    if (bind(s, addr, addrlen) != 0) {
+    if (bind(s.get(), addr, addrlen) != 0) {
         set_error(error);
         return -1;
     }
 
     if (type == SOCK_STREAM || type == SOCK_SEQPACKET) {
-        if (listen(s, SOMAXCONN) != 0) {
+        if (listen(s.get(), SOMAXCONN) != 0) {
             set_error(error);
             return -1;
         }
diff --git a/adb/sysdeps/uio.h b/adb/sysdeps/uio.h
index d06ef89..ced884b 100644
--- a/adb/sysdeps/uio.h
+++ b/adb/sysdeps/uio.h
@@ -18,6 +18,8 @@
 
 #include <sys/types.h>
 
+#include "adb_unique_fd.h"
+
 #if defined(_WIN32)
 
 // Layout of this struct must match struct WSABUF (verified via static assert in sysdeps_win32.cpp)
@@ -26,13 +28,15 @@
     void* iov_base;
 };
 
-ssize_t adb_writev(int fd, const adb_iovec* iov, int iovcnt);
+ssize_t adb_writev(borrowed_fd fd, const adb_iovec* iov, int iovcnt);
 
 #else
 
 #include <sys/uio.h>
 using adb_iovec = struct iovec;
-#define adb_writev writev
+inline ssize_t adb_writev(borrowed_fd fd, const adb_iovec* iov, int iovcnt) {
+    return writev(fd.get(), iov, iovcnt);
+}
 
 #endif
 
diff --git a/adb/sysdeps_unix.cpp b/adb/sysdeps_unix.cpp
index 4445a44..3fdc917 100644
--- a/adb/sysdeps_unix.cpp
+++ b/adb/sysdeps_unix.cpp
@@ -16,7 +16,7 @@
 
 #include "sysdeps.h"
 
-bool set_tcp_keepalive(int fd, int interval_sec) {
+bool set_tcp_keepalive(borrowed_fd fd, int interval_sec) {
     int enable = (interval_sec > 0);
     if (adb_setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &enable, sizeof(enable))) {
         return false;
diff --git a/adb/sysdeps_win32.cpp b/adb/sysdeps_win32.cpp
index 4c5d8cb..886ded4 100644
--- a/adb/sysdeps_win32.cpp
+++ b/adb/sysdeps_win32.cpp
@@ -145,16 +145,14 @@
 static  FHRec        _win32_fhs[ WIN32_MAX_FHS ];
 static  int          _win32_fh_next;  // where to start search for free FHRec
 
-static FH
-_fh_from_int( int   fd, const char*   func )
-{
-    FH  f;
+static FH _fh_from_int(borrowed_fd bfd, const char* func) {
+    FH f;
 
+    int fd = bfd.get();
     fd -= WIN32_FH_BASE;
 
     if (fd < 0 || fd >= WIN32_MAX_FHS) {
-        D( "_fh_from_int: invalid fd %d passed to %s", fd + WIN32_FH_BASE,
-           func );
+        D("_fh_from_int: invalid fd %d passed to %s", fd + WIN32_FH_BASE, func);
         errno = EBADF;
         return nullptr;
     }
@@ -162,8 +160,7 @@
     f = &_win32_fhs[fd];
 
     if (f->used == 0) {
-        D( "_fh_from_int: invalid fd %d passed to %s", fd + WIN32_FH_BASE,
-           func );
+        D("_fh_from_int: invalid fd %d passed to %s", fd + WIN32_FH_BASE, func);
         errno = EBADF;
         return nullptr;
     }
@@ -171,20 +168,15 @@
     return f;
 }
 
-
-static int
-_fh_to_int( FH  f )
-{
+static int _fh_to_int(FH f) {
     if (f && f->used && f >= _win32_fhs && f < _win32_fhs + WIN32_MAX_FHS)
         return (int)(f - _win32_fhs) + WIN32_FH_BASE;
 
     return -1;
 }
 
-static FH
-_fh_alloc( FHClass  clazz )
-{
-    FH   f = nullptr;
+static FH _fh_alloc(FHClass clazz) {
+    FH f = nullptr;
 
     std::lock_guard<std::mutex> lock(_win32_lock);
 
@@ -206,10 +198,7 @@
     return nullptr;
 }
 
-
-static int
-_fh_close( FH   f )
-{
+static int _fh_close(FH f) {
     // Use lock so that closing only happens once and so that _fh_alloc can't
     // allocate a FH that we're in the middle of closing.
     std::lock_guard<std::mutex> lock(_win32_lock);
@@ -456,7 +445,7 @@
     return _fh_to_int(f);
 }
 
-int adb_read(int fd, void* buf, int len) {
+int adb_read(borrowed_fd fd, void* buf, int len) {
     FH f = _fh_from_int(fd, __func__);
 
     if (f == nullptr) {
@@ -467,7 +456,7 @@
     return f->clazz->_fh_read(f, buf, len);
 }
 
-int adb_write(int fd, const void* buf, int len) {
+int adb_write(borrowed_fd fd, const void* buf, int len) {
     FH f = _fh_from_int(fd, __func__);
 
     if (f == nullptr) {
@@ -478,7 +467,7 @@
     return f->clazz->_fh_write(f, buf, len);
 }
 
-ssize_t adb_writev(int fd, const adb_iovec* iov, int iovcnt) {
+ssize_t adb_writev(borrowed_fd fd, const adb_iovec* iov, int iovcnt) {
     FH f = _fh_from_int(fd, __func__);
 
     if (f == nullptr) {
@@ -489,7 +478,7 @@
     return f->clazz->_fh_writev(f, iov, iovcnt);
 }
 
-int64_t adb_lseek(int fd, int64_t pos, int where) {
+int64_t adb_lseek(borrowed_fd fd, int64_t pos, int where) {
     FH f = _fh_from_int(fd, __func__);
     if (!f) {
         errno = EBADF;
@@ -973,11 +962,11 @@
 }
 
 #undef accept
-int adb_socket_accept(int serverfd, struct sockaddr* addr, socklen_t* addrlen) {
+int adb_socket_accept(borrowed_fd serverfd, struct sockaddr* addr, socklen_t* addrlen) {
     FH serverfh = _fh_from_int(serverfd, __func__);
 
     if (!serverfh || serverfh->clazz != &_fh_socket_class) {
-        D("adb_socket_accept: invalid fd %d", serverfd);
+        D("adb_socket_accept: invalid fd %d", serverfd.get());
         errno = EBADF;
         return -1;
     }
@@ -992,7 +981,7 @@
     fh->fh_socket = accept(serverfh->fh_socket, addr, addrlen);
     if (fh->fh_socket == INVALID_SOCKET) {
         const DWORD err = WSAGetLastError();
-        LOG(ERROR) << "adb_socket_accept: accept on fd " << serverfd
+        LOG(ERROR) << "adb_socket_accept: accept on fd " << serverfd.get()
                    << " failed: " + android::base::SystemErrorCodeToString(err);
         _socket_set_errno(err);
         return -1;
@@ -1000,16 +989,16 @@
 
     const int fd = _fh_to_int(fh.get());
     snprintf(fh->name, sizeof(fh->name), "%d(accept:%s)", fd, serverfh->name);
-    D("adb_socket_accept on fd %d returns fd %d", serverfd, fd);
+    D("adb_socket_accept on fd %d returns fd %d", serverfd.get(), fd);
     fh.release();
     return fd;
 }
 
-int adb_setsockopt(int fd, int level, int optname, const void* optval, socklen_t optlen) {
+int adb_setsockopt(borrowed_fd fd, int level, int optname, const void* optval, socklen_t optlen) {
     FH fh = _fh_from_int(fd, __func__);
 
     if (!fh || fh->clazz != &_fh_socket_class) {
-        D("adb_setsockopt: invalid fd %d", fd);
+        D("adb_setsockopt: invalid fd %d", fd.get());
         errno = EBADF;
         return -1;
     }
@@ -1022,7 +1011,7 @@
         setsockopt(fh->fh_socket, level, optname, reinterpret_cast<const char*>(optval), optlen);
     if (result == SOCKET_ERROR) {
         const DWORD err = WSAGetLastError();
-        D("adb_setsockopt: setsockopt on fd %d level %d optname %d failed: %s\n", fd, level,
+        D("adb_setsockopt: setsockopt on fd %d level %d optname %d failed: %s\n", fd.get(), level,
           optname, android::base::SystemErrorCodeToString(err).c_str());
         _socket_set_errno(err);
         result = -1;
@@ -1030,11 +1019,11 @@
     return result;
 }
 
-int adb_getsockname(int fd, struct sockaddr* sockaddr, socklen_t* optlen) {
+static int adb_getsockname(borrowed_fd fd, struct sockaddr* sockaddr, socklen_t* optlen) {
     FH fh = _fh_from_int(fd, __func__);
 
     if (!fh || fh->clazz != &_fh_socket_class) {
-        D("adb_getsockname: invalid fd %d", fd);
+        D("adb_getsockname: invalid fd %d", fd.get());
         errno = EBADF;
         return -1;
     }
@@ -1042,7 +1031,7 @@
     int result = getsockname(fh->fh_socket, sockaddr, optlen);
     if (result == SOCKET_ERROR) {
         const DWORD err = WSAGetLastError();
-        D("adb_getsockname: setsockopt on fd %d failed: %s\n", fd,
+        D("adb_getsockname: setsockopt on fd %d failed: %s\n", fd.get(),
           android::base::SystemErrorCodeToString(err).c_str());
         _socket_set_errno(err);
         result = -1;
@@ -1050,7 +1039,7 @@
     return result;
 }
 
-int adb_socket_get_local_port(int fd) {
+int adb_socket_get_local_port(borrowed_fd fd) {
     sockaddr_storage addr_storage;
     socklen_t addr_len = sizeof(addr_storage);
 
@@ -1068,11 +1057,11 @@
     return ntohs(reinterpret_cast<sockaddr_in*>(&addr_storage)->sin_port);
 }
 
-int adb_shutdown(int fd, int direction) {
+int adb_shutdown(borrowed_fd fd, int direction) {
     FH f = _fh_from_int(fd, __func__);
 
     if (!f || f->clazz != &_fh_socket_class) {
-        D("adb_shutdown: invalid fd %d", fd);
+        D("adb_shutdown: invalid fd %d", fd.get());
         errno = EBADF;
         return -1;
     }
@@ -1080,7 +1069,7 @@
     D("adb_shutdown: %s", f->name);
     if (shutdown(f->fh_socket, direction) == SOCKET_ERROR) {
         const DWORD err = WSAGetLastError();
-        D("socket shutdown fd %d failed: %s", fd,
+        D("socket shutdown fd %d failed: %s", fd.get(),
           android::base::SystemErrorCodeToString(err).c_str());
         _socket_set_errno(err);
         return -1;
@@ -1138,12 +1127,12 @@
     return -1;
 }
 
-bool set_file_block_mode(int fd, bool block) {
+bool set_file_block_mode(borrowed_fd fd, bool block) {
     FH fh = _fh_from_int(fd, __func__);
 
     if (!fh || !fh->used) {
         errno = EBADF;
-        D("Setting nonblocking on bad file descriptor %d", fd);
+        D("Setting nonblocking on bad file descriptor %d", fd.get());
         return false;
     }
 
@@ -1152,22 +1141,22 @@
         if (ioctlsocket(fh->u.socket, FIONBIO, &x) != 0) {
             int error = WSAGetLastError();
             _socket_set_errno(error);
-            D("Setting %d nonblocking failed (%d)", fd, error);
+            D("Setting %d nonblocking failed (%d)", fd.get(), error);
             return false;
         }
         return true;
     } else {
         errno = ENOTSOCK;
-        D("Setting nonblocking on non-socket %d", fd);
+        D("Setting nonblocking on non-socket %d", fd.get());
         return false;
     }
 }
 
-bool set_tcp_keepalive(int fd, int interval_sec) {
+bool set_tcp_keepalive(borrowed_fd fd, int interval_sec) {
     FH fh = _fh_from_int(fd, __func__);
 
     if (!fh || fh->clazz != &_fh_socket_class) {
-        D("set_tcp_keepalive(%d) failed: invalid fd", fd);
+        D("set_tcp_keepalive(%d) failed: invalid fd", fd.get());
         errno = EBADF;
         return false;
     }
@@ -1181,7 +1170,7 @@
     if (WSAIoctl(fh->fh_socket, SIO_KEEPALIVE_VALS, &keepalive, sizeof(keepalive), nullptr, 0,
                  &bytes_returned, nullptr, nullptr) != 0) {
         const DWORD err = WSAGetLastError();
-        D("set_tcp_keepalive(%d) failed: %s", fd,
+        D("set_tcp_keepalive(%d) failed: %s", fd.get(),
           android::base::SystemErrorCodeToString(err).c_str());
         _socket_set_errno(err);
         return false;
@@ -1228,12 +1217,12 @@
 // Returns a console HANDLE if |fd| is a console, otherwise returns nullptr.
 // If a valid HANDLE is returned and |mode| is not null, |mode| is also filled
 // with the console mode. Requires GENERIC_READ access to the underlying HANDLE.
-static HANDLE _get_console_handle(int fd, DWORD* mode=nullptr) {
+static HANDLE _get_console_handle(borrowed_fd fd, DWORD* mode = nullptr) {
     // First check isatty(); this is very fast and eliminates most non-console
     // FDs, but returns 1 for both consoles and character devices like NUL.
 #pragma push_macro("isatty")
 #undef isatty
-    if (!isatty(fd)) {
+    if (!isatty(fd.get())) {
         return nullptr;
     }
 #pragma pop_macro("isatty")
@@ -1241,7 +1230,7 @@
     // To differentiate between character devices and consoles we need to get
     // the underlying HANDLE and use GetConsoleMode(), which is what requires
     // GENERIC_READ permissions.
-    const intptr_t intptr_handle = _get_osfhandle(fd);
+    const intptr_t intptr_handle = _get_osfhandle(fd.get());
     if (intptr_handle == -1) {
         return nullptr;
     }
@@ -1265,7 +1254,7 @@
     return _get_console_handle(fd);
 }
 
-int unix_isatty(int fd) {
+int unix_isatty(borrowed_fd fd) {
     return _get_console_handle(fd) ? 1 : 0;
 }
 
@@ -1645,7 +1634,7 @@
 
 // Prefix the len bytes in buf with the escape character, and then return the
 // new buffer length.
-size_t _escape_prefix(char* const buf, const size_t len) {
+static size_t _escape_prefix(char* const buf, const size_t len) {
     // If nothing to prefix, don't do anything. We might be called with
     // len == 0, if alt was held down with a dead key which produced nothing.
     if (len == 0) {
@@ -2073,7 +2062,7 @@
 }
 
 // Called by 'adb shell' and 'adb exec-in' (via unix_read()) to read from stdin.
-int unix_read_interruptible(int fd, void* buf, size_t len) {
+int unix_read_interruptible(borrowed_fd fd, void* buf, size_t len) {
     if ((fd == STDIN_FILENO) && (_console_handle != nullptr)) {
         // If it is a request to read from stdin, and stdin_raw_init() has been
         // called, and it successfully configured the console, then read from
@@ -2093,7 +2082,7 @@
         // plain read() in favor of unix_read() or adb_read().
 #pragma push_macro("read")
 #undef read
-        return read(fd, buf, len);
+        return read(fd.get(), buf, len);
 #pragma pop_macro("read")
     }
 }
diff --git a/base/Android.bp b/base/Android.bp
index 38f301a..340f814 100644
--- a/base/Android.bp
+++ b/base/Android.bp
@@ -29,6 +29,7 @@
     vendor_available: true,
     recovery_available: true,
     host_supported: true,
+    native_bridge_supported: true,
     export_include_dirs: ["include"],
 
     target: {
@@ -45,6 +46,7 @@
     name: "libbase_defaults",
     defaults: ["libbase_cflags_defaults"],
     srcs: [
+        "abi_compatibility.cpp",
         "chrono_utils.cpp",
         "cmsg.cpp",
         "file.cpp",
@@ -100,6 +102,7 @@
     vendor_available: true,
     recovery_available: true,
     host_supported: true,
+    native_bridge_supported: true,
     vndk: {
         enabled: true,
         support_system_process: true,
diff --git a/base/abi_compatibility.cpp b/base/abi_compatibility.cpp
new file mode 100644
index 0000000..06a7801
--- /dev/null
+++ b/base/abi_compatibility.cpp
@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <memory>
+
+#include "android-base/cmsg.h"
+#include "android-base/file.h"
+#include "android-base/mapped_file.h"
+#include "android-base/unique_fd.h"
+
+namespace android {
+namespace base {
+
+// These ABI-compatibility shims are in a separate file for two reasons:
+//   1. If they were in the file with the actual functions, it prevents calls to
+//      those functions by other functions in the file, due to ambiguity.
+//   2. We will hopefully be able to delete these quickly.
+
+#if !defined(_WIN32)
+ssize_t SendFileDescriptorVector(int sockfd, const void* data, size_t len,
+                                 const std::vector<int>& fds) {
+  return SendFileDescriptorVector(borrowed_fd(sockfd), data, len, fds);
+}
+
+ssize_t ReceiveFileDescriptorVector(int sockfd, void* data, size_t len, size_t max_fds,
+                                    std::vector<unique_fd>* fds) {
+  return ReceiveFileDescriptorVector(borrowed_fd(sockfd), data, len, max_fds, fds);
+}
+#endif
+
+bool ReadFdToString(int fd, std::string* content) {
+  return ReadFdToString(borrowed_fd(fd), content);
+}
+
+bool WriteStringToFd(const std::string& content, int fd) {
+  return WriteStringToFd(content, borrowed_fd(fd));
+}
+
+bool ReadFully(int fd, void* data, size_t byte_count) {
+  return ReadFully(borrowed_fd(fd), data, byte_count);
+}
+
+bool ReadFullyAtOffset(int fd, void* data, size_t byte_count, off64_t offset) {
+  return ReadFullyAtOffset(borrowed_fd(fd), data, byte_count, offset);
+}
+
+bool WriteFully(int fd, const void* data, size_t byte_count) {
+  return WriteFully(borrowed_fd(fd), data, byte_count);
+}
+
+#if defined(__LP64__)
+#define MAPPEDFILE_FROMFD _ZN10MappedFile6FromFdEilmi
+#else
+#define MAPPEDFILE_FROMFD _ZN10MappedFile6FromFdEixmi
+#endif
+
+#pragma clang diagnostic ignored "-Wreturn-type-c-linkage"
+extern "C" std::unique_ptr<MappedFile> MAPPEDFILE_FROMFD(int fd, off64_t offset, size_t length,
+                                                         int prot) {
+  return MappedFile::FromFd(fd, offset, length, prot);
+}
+
+}  // namespace base
+}  // namespace android
diff --git a/base/cmsg.cpp b/base/cmsg.cpp
index 42866f8..1fa873c 100644
--- a/base/cmsg.cpp
+++ b/base/cmsg.cpp
@@ -29,7 +29,7 @@
 namespace android {
 namespace base {
 
-ssize_t SendFileDescriptorVector(int sockfd, const void* data, size_t len,
+ssize_t SendFileDescriptorVector(borrowed_fd sockfd, const void* data, size_t len,
                                  const std::vector<int>& fds) {
   size_t cmsg_space = CMSG_SPACE(sizeof(int) * fds.size());
   size_t cmsg_len = CMSG_LEN(sizeof(int) * fds.size());
@@ -67,10 +67,10 @@
   int flags = 0;
 #endif
 
-  return TEMP_FAILURE_RETRY(sendmsg(sockfd, &msg, flags));
+  return TEMP_FAILURE_RETRY(sendmsg(sockfd.get(), &msg, flags));
 }
 
-ssize_t ReceiveFileDescriptorVector(int sockfd, void* data, size_t len, size_t max_fds,
+ssize_t ReceiveFileDescriptorVector(borrowed_fd sockfd, void* data, size_t len, size_t max_fds,
                                     std::vector<unique_fd>* fds) {
   fds->clear();
 
@@ -98,7 +98,7 @@
   flags |= MSG_CMSG_CLOEXEC | MSG_NOSIGNAL;
 #endif
 
-  ssize_t rc = TEMP_FAILURE_RETRY(recvmsg(sockfd, &msg, flags));
+  ssize_t rc = TEMP_FAILURE_RETRY(recvmsg(sockfd.get(), &msg, flags));
 
   if (rc == -1) {
     return -1;
diff --git a/base/file.cpp b/base/file.cpp
index adc8984..3dfcfbb 100644
--- a/base/file.cpp
+++ b/base/file.cpp
@@ -176,20 +176,20 @@
 // Versions of standard library APIs that support UTF-8 strings.
 using namespace android::base::utf8;
 
-bool ReadFdToString(int fd, std::string* content) {
+bool ReadFdToString(borrowed_fd fd, std::string* content) {
   content->clear();
 
   // Although original we had small files in mind, this code gets used for
   // very large files too, where the std::string growth heuristics might not
   // be suitable. https://code.google.com/p/android/issues/detail?id=258500.
   struct stat sb;
-  if (fstat(fd, &sb) != -1 && sb.st_size > 0) {
+  if (fstat(fd.get(), &sb) != -1 && sb.st_size > 0) {
     content->reserve(sb.st_size);
   }
 
   char buf[BUFSIZ];
   ssize_t n;
-  while ((n = TEMP_FAILURE_RETRY(read(fd, &buf[0], sizeof(buf)))) > 0) {
+  while ((n = TEMP_FAILURE_RETRY(read(fd.get(), &buf[0], sizeof(buf)))) > 0) {
     content->append(buf, n);
   }
   return (n == 0) ? true : false;
@@ -206,11 +206,11 @@
   return ReadFdToString(fd, content);
 }
 
-bool WriteStringToFd(const std::string& content, int fd) {
+bool WriteStringToFd(const std::string& content, borrowed_fd fd) {
   const char* p = content.data();
   size_t left = content.size();
   while (left > 0) {
-    ssize_t n = TEMP_FAILURE_RETRY(write(fd, p, left));
+    ssize_t n = TEMP_FAILURE_RETRY(write(fd.get(), p, left));
     if (n == -1) {
       return false;
     }
@@ -269,11 +269,11 @@
   return WriteStringToFd(content, fd) || CleanUpAfterFailedWrite(path);
 }
 
-bool ReadFully(int fd, void* data, size_t byte_count) {
+bool ReadFully(borrowed_fd fd, void* data, size_t byte_count) {
   uint8_t* p = reinterpret_cast<uint8_t*>(data);
   size_t remaining = byte_count;
   while (remaining > 0) {
-    ssize_t n = TEMP_FAILURE_RETRY(read(fd, p, remaining));
+    ssize_t n = TEMP_FAILURE_RETRY(read(fd.get(), p, remaining));
     if (n <= 0) return false;
     p += n;
     remaining -= n;
@@ -284,14 +284,14 @@
 #if defined(_WIN32)
 // Windows implementation of pread. Note that this DOES move the file descriptors read position,
 // but it does so atomically.
-static ssize_t pread(int fd, void* data, size_t byte_count, off64_t offset) {
+static ssize_t pread(borrowed_fd fd, void* data, size_t byte_count, off64_t offset) {
   DWORD bytes_read;
   OVERLAPPED overlapped;
   memset(&overlapped, 0, sizeof(OVERLAPPED));
   overlapped.Offset = static_cast<DWORD>(offset);
   overlapped.OffsetHigh = static_cast<DWORD>(offset >> 32);
-  if (!ReadFile(reinterpret_cast<HANDLE>(_get_osfhandle(fd)), data, static_cast<DWORD>(byte_count),
-                &bytes_read, &overlapped)) {
+  if (!ReadFile(reinterpret_cast<HANDLE>(_get_osfhandle(fd.get())), data,
+                static_cast<DWORD>(byte_count), &bytes_read, &overlapped)) {
     // In case someone tries to read errno (since this is masquerading as a POSIX call)
     errno = EIO;
     return -1;
@@ -300,10 +300,10 @@
 }
 #endif
 
-bool ReadFullyAtOffset(int fd, void* data, size_t byte_count, off64_t offset) {
+bool ReadFullyAtOffset(borrowed_fd fd, void* data, size_t byte_count, off64_t offset) {
   uint8_t* p = reinterpret_cast<uint8_t*>(data);
   while (byte_count > 0) {
-    ssize_t n = TEMP_FAILURE_RETRY(pread(fd, p, byte_count, offset));
+    ssize_t n = TEMP_FAILURE_RETRY(pread(fd.get(), p, byte_count, offset));
     if (n <= 0) return false;
     p += n;
     byte_count -= n;
@@ -312,11 +312,11 @@
   return true;
 }
 
-bool WriteFully(int fd, const void* data, size_t byte_count) {
+bool WriteFully(borrowed_fd fd, const void* data, size_t byte_count) {
   const uint8_t* p = reinterpret_cast<const uint8_t*>(data);
   size_t remaining = byte_count;
   while (remaining > 0) {
-    ssize_t n = TEMP_FAILURE_RETRY(write(fd, p, remaining));
+    ssize_t n = TEMP_FAILURE_RETRY(write(fd.get(), p, remaining));
     if (n == -1) return false;
     p += n;
     remaining -= n;
diff --git a/base/include/android-base/cmsg.h b/base/include/android-base/cmsg.h
index 7f93ddc..e4197b1 100644
--- a/base/include/android-base/cmsg.h
+++ b/base/include/android-base/cmsg.h
@@ -51,20 +51,20 @@
 // Note that the write can return short if the socket type is SOCK_STREAM. When
 // this happens, file descriptors are still sent to the other end, but with
 // truncated data. For this reason, using SOCK_SEQPACKET or SOCK_DGRAM is recommended.
-ssize_t SendFileDescriptorVector(int sock, const void* data, size_t len,
+ssize_t SendFileDescriptorVector(borrowed_fd sock, const void* data, size_t len,
                                  const std::vector<int>& fds);
 
 // Receive file descriptors from a Unix domain socket.
 //
 // If more FDs (or bytes, for datagram sockets) are received than expected,
 // -1 is returned with errno set to EMSGSIZE, and all received FDs are thrown away.
-ssize_t ReceiveFileDescriptorVector(int sock, void* data, size_t len, size_t max_fds,
+ssize_t ReceiveFileDescriptorVector(borrowed_fd sock, void* data, size_t len, size_t max_fds,
                                     std::vector<android::base::unique_fd>* fds);
 
 // Helper for SendFileDescriptorVector that constructs a std::vector for you, e.g.:
 //   SendFileDescriptors(sock, "foo", 3, std::move(fd1), std::move(fd2))
 template <typename... Args>
-ssize_t SendFileDescriptors(int sock, const void* data, size_t len, Args&&... sent_fds) {
+ssize_t SendFileDescriptors(borrowed_fd sock, const void* data, size_t len, Args&&... sent_fds) {
   // Do not allow implicit conversion to int: people might try to do something along the lines of:
   //   SendFileDescriptors(..., std::move(a_unique_fd))
   // and be surprised when the unique_fd isn't closed afterwards.
@@ -79,7 +79,7 @@
 // If fewer file descriptors are received than requested, -1 is returned with errno set to ENOMSG.
 // In both cases, all arguments are cleared and any received FDs are thrown away.
 template <typename... Args>
-ssize_t ReceiveFileDescriptors(int sock, void* data, size_t len, Args&&... received_fds) {
+ssize_t ReceiveFileDescriptors(borrowed_fd sock, void* data, size_t len, Args&&... received_fds) {
   std::vector<unique_fd*> fds;
   Append(fds, std::forward<Args>(received_fds)...);
 
diff --git a/base/include/android-base/file.h b/base/include/android-base/file.h
index f8748b5..c622562 100644
--- a/base/include/android-base/file.h
+++ b/base/include/android-base/file.h
@@ -21,8 +21,9 @@
 
 #include <string>
 
-#include <android-base/macros.h>
+#include "android-base/macros.h"
 #include "android-base/off64_t.h"
+#include "android-base/unique_fd.h"
 
 #if !defined(_WIN32) && !defined(O_BINARY)
 /** Windows needs O_BINARY, but Unix never mangles line endings. */
@@ -77,13 +78,13 @@
 namespace android {
 namespace base {
 
-bool ReadFdToString(int fd, std::string* content);
+bool ReadFdToString(borrowed_fd fd, std::string* content);
 bool ReadFileToString(const std::string& path, std::string* content,
                       bool follow_symlinks = false);
 
 bool WriteStringToFile(const std::string& content, const std::string& path,
                        bool follow_symlinks = false);
-bool WriteStringToFd(const std::string& content, int fd);
+bool WriteStringToFd(const std::string& content, borrowed_fd fd);
 
 #if !defined(_WIN32)
 bool WriteStringToFile(const std::string& content, const std::string& path,
@@ -91,7 +92,7 @@
                        bool follow_symlinks = false);
 #endif
 
-bool ReadFully(int fd, void* data, size_t byte_count);
+bool ReadFully(borrowed_fd fd, void* data, size_t byte_count);
 
 // Reads `byte_count` bytes from the file descriptor at the specified offset.
 // Returns false if there was an IO error or EOF was reached before reading `byte_count` bytes.
@@ -101,9 +102,9 @@
 // get modified. This means that ReadFullyAtOffset can be used concurrently with other calls to the
 // same function, but concurrently seeking or reading incrementally can lead to unexpected
 // behavior.
-bool ReadFullyAtOffset(int fd, void* data, size_t byte_count, off64_t offset);
+bool ReadFullyAtOffset(borrowed_fd fd, void* data, size_t byte_count, off64_t offset);
 
-bool WriteFully(int fd, const void* data, size_t byte_count);
+bool WriteFully(borrowed_fd fd, const void* data, size_t byte_count);
 
 bool RemoveFileIfExists(const std::string& path, std::string* err = nullptr);
 
diff --git a/base/include/android-base/mapped_file.h b/base/include/android-base/mapped_file.h
index 80513b1..b719646 100644
--- a/base/include/android-base/mapped_file.h
+++ b/base/include/android-base/mapped_file.h
@@ -16,13 +16,14 @@
 
 #pragma once
 
-#include "android-base/macros.h"
-#include "android-base/off64_t.h"
-
 #include <sys/types.h>
 
 #include <memory>
 
+#include "android-base/macros.h"
+#include "android-base/off64_t.h"
+#include "android-base/unique_fd.h"
+
 #if defined(_WIN32)
 #include <windows.h>
 #define PROT_READ 1
@@ -44,7 +45,8 @@
    * `offset` does not need to be page-aligned. If `PROT_WRITE` is set in `prot`, the mapping
    * will be writable, otherwise it will be read-only. Mappings are always `MAP_SHARED`.
    */
-  static std::unique_ptr<MappedFile> FromFd(int fd, off64_t offset, size_t length, int prot);
+  static std::unique_ptr<MappedFile> FromFd(borrowed_fd fd, off64_t offset, size_t length,
+                                            int prot);
 
   /**
    * Removes the mapping.
diff --git a/base/include/android-base/strings.h b/base/include/android-base/strings.h
index 8e9716f..b1c22c9 100644
--- a/base/include/android-base/strings.h
+++ b/base/include/android-base/strings.h
@@ -18,6 +18,7 @@
 
 #include <sstream>
 #include <string>
+#include <string_view>
 #include <vector>
 
 namespace android {
@@ -68,5 +69,21 @@
 // Tests whether 'lhs' equals 'rhs', ignoring case.
 bool EqualsIgnoreCase(std::string_view lhs, std::string_view rhs);
 
+// Removes `prefix` from the start of the given string and returns true (if
+// it was present), false otherwise.
+inline bool ConsumePrefix(std::string_view* s, std::string_view prefix) {
+  if (!StartsWith(*s, prefix)) return false;
+  s->remove_prefix(prefix.size());
+  return true;
+}
+
+// Removes `suffix` from the end of the given string and returns true (if
+// it was present), false otherwise.
+inline bool ConsumeSuffix(std::string_view* s, std::string_view suffix) {
+  if (!EndsWith(*s, suffix)) return false;
+  s->remove_suffix(suffix.size());
+  return true;
+}
+
 }  // namespace base
 }  // namespace android
diff --git a/base/include/android-base/unique_fd.h b/base/include/android-base/unique_fd.h
index 3fa3bea..3a02cff 100644
--- a/base/include/android-base/unique_fd.h
+++ b/base/include/android-base/unique_fd.h
@@ -103,7 +103,17 @@
   void reset(int new_value = -1) { reset(new_value, nullptr); }
 
   int get() const { return fd_; }
+
+#if !defined(ANDROID_BASE_UNIQUE_FD_DISABLE_IMPLICIT_CONVERSION)
+  // unique_fd's operator int is dangerous, but we have way too much code that
+  // depends on it, so make this opt-in at first.
   operator int() const { return get(); }  // NOLINT
+#endif
+
+  bool operator>=(int rhs) const { return get() >= rhs; }
+  bool operator<(int rhs) const { return get() < rhs; }
+  bool operator==(int rhs) const { return get() == rhs; }
+  bool operator!=(int rhs) const { return get() != rhs; }
 
   // Catch bogus error checks (i.e.: "!fd" instead of "fd != -1").
   bool operator!() const = delete;
@@ -246,6 +256,22 @@
 
 #endif  // !defined(_WIN32)
 
+// A wrapper type that can be implicitly constructed from either int or unique_fd.
+struct borrowed_fd {
+  /* implicit */ borrowed_fd(int fd) : fd_(fd) {}
+  template <typename T>
+  /* implicit */ borrowed_fd(const unique_fd_impl<T>& ufd) : fd_(ufd.get()) {}
+
+  int get() const { return fd_; }
+
+  bool operator>=(int rhs) const { return get() >= rhs; }
+  bool operator<(int rhs) const { return get() < rhs; }
+  bool operator==(int rhs) const { return get() == rhs; }
+  bool operator!=(int rhs) const { return get() != rhs; }
+
+ private:
+  int fd_ = -1;
+};
 }  // namespace base
 }  // namespace android
 
diff --git a/base/mapped_file.cpp b/base/mapped_file.cpp
index 7c65dc3..f689bfa 100644
--- a/base/mapped_file.cpp
+++ b/base/mapped_file.cpp
@@ -18,6 +18,8 @@
 
 #include <errno.h>
 
+#include "android-base/unique_fd.h"
+
 namespace android {
 namespace base {
 
@@ -31,7 +33,8 @@
 #endif
 }
 
-std::unique_ptr<MappedFile> MappedFile::FromFd(int fd, off64_t offset, size_t length, int prot) {
+std::unique_ptr<MappedFile> MappedFile::FromFd(borrowed_fd fd, off64_t offset, size_t length,
+                                               int prot) {
   static off64_t page_size = InitPageSize();
   size_t slop = offset % page_size;
   off64_t file_offset = offset - slop;
@@ -39,7 +42,7 @@
 
 #if defined(_WIN32)
   HANDLE handle =
-      CreateFileMapping(reinterpret_cast<HANDLE>(_get_osfhandle(fd)), nullptr,
+      CreateFileMapping(reinterpret_cast<HANDLE>(_get_osfhandle(fd.get())), nullptr,
                         (prot & PROT_WRITE) ? PAGE_READWRITE : PAGE_READONLY, 0, 0, nullptr);
   if (handle == nullptr) {
     // http://b/119818070 "app crashes when reading asset of zero length".
@@ -58,7 +61,7 @@
   return std::unique_ptr<MappedFile>(
       new MappedFile{static_cast<char*>(base), length, slop, handle});
 #else
-  void* base = mmap(nullptr, file_length, prot, MAP_SHARED, fd, file_offset);
+  void* base = mmap(nullptr, file_length, prot, MAP_SHARED, fd.get(), file_offset);
   if (base == MAP_FAILED) {
     // http://b/119818070 "app crashes when reading asset of zero length".
     // mmap fails with EINVAL for a zero length region.
diff --git a/base/strings_test.cpp b/base/strings_test.cpp
index 9d74094..ca3c0b8 100644
--- a/base/strings_test.cpp
+++ b/base/strings_test.cpp
@@ -295,3 +295,19 @@
 TEST(strings, ubsan_28729303) {
   android::base::Split("/dev/null", ":");
 }
+
+TEST(strings, ConsumePrefix) {
+  std::string_view s{"foo.bar"};
+  ASSERT_FALSE(android::base::ConsumePrefix(&s, "bar."));
+  ASSERT_EQ("foo.bar", s);
+  ASSERT_TRUE(android::base::ConsumePrefix(&s, "foo."));
+  ASSERT_EQ("bar", s);
+}
+
+TEST(strings, ConsumeSuffix) {
+  std::string_view s{"foo.bar"};
+  ASSERT_FALSE(android::base::ConsumeSuffix(&s, ".foo"));
+  ASSERT_EQ("foo.bar", s);
+  ASSERT_TRUE(android::base::ConsumeSuffix(&s, ".bar"));
+  ASSERT_EQ("foo", s);
+}
diff --git a/bootstat/boot_reason_test.sh b/bootstat/boot_reason_test.sh
index cb09433..8979b0c 100755
--- a/bootstat/boot_reason_test.sh
+++ b/bootstat/boot_reason_test.sh
@@ -1253,7 +1253,12 @@
         echo 1 reboot,empty # negative test (ID for unknown is 1)
         ;;
       reboot)
-        echo 1 reboo        # negative test (ID for unknown is 1)
+        echo 1 reboog       # negative test (ID for unknown is 1)
+        ;;
+      'reboot,pmic_off_fault,.*')
+        echo ${id} reboot,pmic_off_fault,hello,world
+        echo ${id} reboot,pmic_off_fault,
+        echo 1 reboot,pmic_off_fault
         ;;
     esac
     echo ${id} "${match}"   # matches b/c of exact
@@ -1266,6 +1271,8 @@
 - (wait until screen is up, boot has completed)
 - read bootstat for kBootReasonMap entries and test them all" ]
 test_kBootReasonMap() {
+  checkDebugBuild || return
+  duration_test 15
   local tempfile="`mktemp`"
   local arg=--boot_reason_enum
   adb_su bootstat ${arg} </dev/null 2>/dev/null |
@@ -1295,7 +1302,8 @@
   report_bootstat_logs -t${T} \
     '-bootstat: Service started: bootstat --boot_reason_enum=' \
     '-bootstat: Unknown boot reason: reboot,empty' \
-    '-bootstat: Unknown boot reason: reboo'
+    '-bootstat: Unknown boot reason: reboog' \
+    '-bootstat: Unknown boot reason: reboot,pmic_off_fault'
 }
 
 [ "USAGE: ${progname} [-s SERIAL] [tests]...
diff --git a/bootstat/bootstat.cpp b/bootstat/bootstat.cpp
index 558e6c4..c091ff7 100644
--- a/bootstat/bootstat.cpp
+++ b/bootstat/bootstat.cpp
@@ -1183,6 +1183,7 @@
   boot_event_store.AddBootEventWithValue(boot_complete_prefix, uptime_s.count());
 
   RecordInitBootTimeProp(&boot_event_store, "ro.boottime.init");
+  RecordInitBootTimeProp(&boot_event_store, "ro.boottime.init.first_stage");
   RecordInitBootTimeProp(&boot_event_store, "ro.boottime.init.selinux");
   RecordInitBootTimeProp(&boot_event_store, "ro.boottime.init.cold_boot_wait");
 
diff --git a/debuggerd/crasher/crasher.cpp b/debuggerd/crasher/crasher.cpp
index f0bdfbf..3041664 100644
--- a/debuggerd/crasher/crasher.cpp
+++ b/debuggerd/crasher/crasher.cpp
@@ -193,6 +193,7 @@
     fprintf(stderr, "  kuser_memory_barrier  call kuser_memory_barrier\n");
     fprintf(stderr, "  kuser_cmpxchg64       call kuser_cmpxchg64\n");
 #endif
+    fprintf(stderr, "  xom                   read execute-only memory\n");
     fprintf(stderr, "\n");
     fprintf(stderr, "  LOG_ALWAYS_FATAL      call liblog LOG_ALWAYS_FATAL\n");
     fprintf(stderr, "  LOG_ALWAYS_FATAL_IF   call liblog LOG_ALWAYS_FATAL_IF\n");
@@ -314,6 +315,11 @@
     } else if (!strcasecmp(arg, "seccomp")) {
       set_system_seccomp_filter();
       syscall(99999);
+#if defined(__LP64__)
+    } else if (!strcasecmp(arg, "xom")) {
+      // Try to read part of our code, which will fail if XOM is active.
+      printf("*%lx = %lx\n", reinterpret_cast<long>(usage), *reinterpret_cast<long*>(usage));
+#endif
 #if defined(__arm__)
     } else if (!strcasecmp(arg, "kuser_helper_version")) {
         return __kuser_helper_version;
diff --git a/demangle/Demangler.cpp b/demangle/Demangler.cpp
index 7a3aa81..7bae356 100644
--- a/demangle/Demangler.cpp
+++ b/demangle/Demangler.cpp
@@ -15,6 +15,7 @@
  */
 
 #include <assert.h>
+#include <string.h>
 
 #include <cctype>
 #include <stack>
diff --git a/fastboot/device/usb_client.cpp b/fastboot/device/usb_client.cpp
index fb51a90..511bd5c 100644
--- a/fastboot/device/usb_client.cpp
+++ b/fastboot/device/usb_client.cpp
@@ -257,7 +257,7 @@
         auto bytes_to_read = std::min(len - bytes_read_total, kFbFfsNumBufs * kFbFfsBufSize);
         auto bytes_read_now = handle_->read(handle_.get(), char_data, bytes_to_read);
         if (bytes_read_now < 0) {
-            return bytes_read_total;
+            return bytes_read_total == 0 ? -1 : bytes_read_total;
         }
         bytes_read_total += bytes_read_now;
         char_data += bytes_read_now;
@@ -278,7 +278,7 @@
         auto bytes_to_write = std::min(len - bytes_written_total, kFbFfsNumBufs * kFbFfsBufSize);
         auto bytes_written_now = handle_->write(handle_.get(), data, bytes_to_write);
         if (bytes_written_now < 0) {
-            return bytes_written_total;
+            return bytes_written_total == 0 ? -1 : bytes_written_total;
         }
         bytes_written_total += bytes_written_now;
         char_data += bytes_written_now;
diff --git a/fastboot/fastboot.cpp b/fastboot/fastboot.cpp
index c8caa67..39abc4a 100644
--- a/fastboot/fastboot.cpp
+++ b/fastboot/fastboot.cpp
@@ -502,9 +502,8 @@
 
 static bool UnzipToMemory(ZipArchiveHandle zip, const std::string& entry_name,
                           std::vector<char>* out) {
-    ZipString zip_entry_name(entry_name.c_str());
     ZipEntry zip_entry;
-    if (FindEntry(zip, zip_entry_name, &zip_entry) != 0) {
+    if (FindEntry(zip, entry_name, &zip_entry) != 0) {
         fprintf(stderr, "archive does not contain '%s'\n", entry_name.c_str());
         return false;
     }
@@ -614,9 +613,8 @@
 static int unzip_to_file(ZipArchiveHandle zip, const char* entry_name) {
     unique_fd fd(make_temporary_fd(entry_name));
 
-    ZipString zip_entry_name(entry_name);
     ZipEntry zip_entry;
-    if (FindEntry(zip, zip_entry_name, &zip_entry) != 0) {
+    if (FindEntry(zip, entry_name, &zip_entry) != 0) {
         fprintf(stderr, "archive does not contain '%s'\n", entry_name);
         errno = ENOENT;
         return -1;
diff --git a/fastboot/usb_osx.cpp b/fastboot/usb_osx.cpp
index f597f50..8a3c213 100644
--- a/fastboot/usb_osx.cpp
+++ b/fastboot/usb_osx.cpp
@@ -106,7 +106,7 @@
     kr = (*dev)->CreateInterfaceIterator(dev, &request, &iterator);
 
     if (kr != 0) {
-        ERR("Couldn't create a device interface iterator: (%08x)\n", kr);
+        WARN("Couldn't create a device interface iterator: (%08x)\n", kr);
         return -1;
     }
 
diff --git a/fs_mgr/Android.bp b/fs_mgr/Android.bp
index 4ee9624..ffde114 100644
--- a/fs_mgr/Android.bp
+++ b/fs_mgr/Android.bp
@@ -121,9 +121,14 @@
     shared_libs: [
         "libbootloader_message",
         "libbase",
+        "libcutils",
         "libcrypto",
+        "libext4_utils",
         "libfec",
         "libfs_mgr",
+        "liblog",
+        "liblp",
+        "libselinux",
     ],
     header_libs: [
         "libcutils_headers",
diff --git a/fs_mgr/README.overlayfs.md b/fs_mgr/README.overlayfs.md
index f89e598..d204bfd 100644
--- a/fs_mgr/README.overlayfs.md
+++ b/fs_mgr/README.overlayfs.md
@@ -117,3 +117,25 @@
   be used to clear scratch storage to permit the flash.
   Then reinstate the overrides and continue.
 - File bugs or submit fixes for review.
+- There are other subtle caveats requiring complex logic to solve.
+  Have evaluated them as too complex or not worth the trouble, please
+  File a bug if a use case needs to be covered.
+  - The backing storage is treated fragile, if anything else has
+    issue with the space taken, the backing storage will be cleared
+    out and we reserve the right to not inform, if the layering
+    does not prevent any messaging.
+  - Space remaining threshold is hard coded.  If 1% or more space
+    still remains, overlayfs will not be used, yet that amount of
+    space remaining is problematic.
+  - Flashing a partition via bootloader fastboot, as opposed to user
+    space fastbootd, is not detected, thus a partition may have
+    override content remaining.  adb enable-verity to wipe.
+  - Space is limited, there is near unlimited space on userdata,
+    we have made an architectural decision to not utilize
+    /data/overlay/ at this time.  Acquiring space to use for
+    backing remains an ongoing battle.
+  - First stage init, or ramdisk, can not be overriden.
+  - Backing storage will be discarded or ignored on errors, leading
+    to confusion.  When debugging using **adb remount** it is
+    currently advised to confirm update is present after a reboot
+    to develop confidence.
diff --git a/fs_mgr/fs_mgr.cpp b/fs_mgr/fs_mgr.cpp
index 3ea479e..56ea92c 100644
--- a/fs_mgr/fs_mgr.cpp
+++ b/fs_mgr/fs_mgr.cpp
@@ -1610,38 +1610,6 @@
     return ret;
 }
 
-bool fs_mgr_load_verity_state(int* mode) {
-    /* return the default mode, unless any of the verified partitions are in
-     * logging mode, in which case return that */
-    *mode = VERITY_MODE_DEFAULT;
-
-    Fstab fstab;
-    if (!ReadDefaultFstab(&fstab)) {
-        LERROR << "Failed to read default fstab";
-        return false;
-    }
-
-    for (const auto& entry : fstab) {
-        if (entry.fs_mgr_flags.avb) {
-            *mode = VERITY_MODE_RESTART;  // avb only supports restart mode.
-            break;
-        } else if (!entry.fs_mgr_flags.verify) {
-            continue;
-        }
-
-        int current;
-        if (load_verity_state(entry, &current) < 0) {
-            continue;
-        }
-        if (current != VERITY_MODE_DEFAULT) {
-            *mode = current;
-            break;
-        }
-    }
-
-    return true;
-}
-
 bool fs_mgr_is_verity_enabled(const FstabEntry& entry) {
     if (!entry.fs_mgr_flags.verify && !entry.fs_mgr_flags.avb) {
         return false;
diff --git a/fs_mgr/fs_mgr_fstab.cpp b/fs_mgr/fs_mgr_fstab.cpp
index e7c175f..0cbdcce 100644
--- a/fs_mgr/fs_mgr_fstab.cpp
+++ b/fs_mgr/fs_mgr_fstab.cpp
@@ -261,10 +261,6 @@
                     LWARNING << "Warning: zramsize= flag malformed: " << arg;
                 }
             }
-        } else if (StartsWith(flag, "verify=")) {
-            // If the verify flag is followed by an = and the location for the verity state.
-            entry->fs_mgr_flags.verify = true;
-            entry->verity_loc = arg;
         } else if (StartsWith(flag, "forceencrypt=")) {
             // The forceencrypt flag is followed by an = and the location of the keys.
             entry->fs_mgr_flags.force_crypt = true;
@@ -807,8 +803,11 @@
 std::string GetVerityDeviceName(const FstabEntry& entry) {
     std::string base_device;
     if (entry.mount_point == "/") {
-        // In AVB, the dm device name is vroot instead of system.
-        base_device = entry.fs_mgr_flags.avb ? "vroot" : "system";
+        // When using system-as-root, the device name is fixed as "vroot".
+        if (entry.fs_mgr_flags.avb) {
+            return "vroot";
+        }
+        base_device = "system";
     } else {
         base_device = android::base::Basename(entry.mount_point);
     }
diff --git a/fs_mgr/fs_mgr_overlayfs.cpp b/fs_mgr/fs_mgr_overlayfs.cpp
index c252ab5..a649975 100644
--- a/fs_mgr/fs_mgr_overlayfs.cpp
+++ b/fs_mgr/fs_mgr_overlayfs.cpp
@@ -621,7 +621,9 @@
         if (!dm.GetDmDevicePathByName(partition_name, &path)) {
             // non-DAP A/B device?
             if (fs_mgr_access(super_device)) return "";
-            path = kPhysicalDevice + "system" + (slot_number ? "_a" : "_b");
+            auto other_slot = fs_mgr_get_other_slot_suffix();
+            if (other_slot.empty()) return "";
+            path = kPhysicalDevice + "system" + other_slot;
         }
     }
     return scratch_device_cache = path;
@@ -650,6 +652,25 @@
     return true;
 }
 
+static void TruncatePartitionsWithSuffix(MetadataBuilder* builder, const std::string& suffix) {
+    auto& dm = DeviceMapper::Instance();
+
+    // Remove <other> partitions
+    for (const auto& group : builder->ListGroups()) {
+        for (const auto& part : builder->ListPartitionsInGroup(group)) {
+            const auto& name = part->name();
+            if (!android::base::EndsWith(name, suffix)) {
+                continue;
+            }
+            if (dm.GetState(name) != DmDeviceState::INVALID && !DestroyLogicalPartition(name, 2s)) {
+                continue;
+            }
+            builder->ResizePartition(builder->FindPartition(name), 0);
+        }
+    }
+}
+
+// This is where we find and steal backing storage from the system.
 bool fs_mgr_overlayfs_create_scratch(const Fstab& fstab, std::string* scratch_device,
                                      bool* partition_exists, bool* change) {
     *scratch_device = fs_mgr_overlayfs_scratch_device();
@@ -696,15 +717,24 @@
             // the adb remount overrides :-( .
             auto margin_size = uint64_t(3 * 256 * 1024);
             BlockDeviceInfo info;
-            if (builder->GetBlockDeviceInfo(partition_name, &info)) {
+            if (builder->GetBlockDeviceInfo(fs_mgr_get_super_partition_name(slot_number), &info)) {
                 margin_size = 3 * info.logical_block_size;
             }
             partition_size = std::max(std::min(kMinimumSize, partition_size - margin_size),
                                       partition_size / 2);
             if (partition_size > partition->size()) {
                 if (!builder->ResizePartition(partition, partition_size)) {
-                    LERROR << "resize " << partition_name;
-                    return false;
+                    // Try to free up space by deallocating partitions in the other slot.
+                    TruncatePartitionsWithSuffix(builder.get(), fs_mgr_get_other_slot_suffix());
+
+                    partition_size =
+                            builder->AllocatableSpace() - builder->UsedSpace() + partition->size();
+                    partition_size = std::max(std::min(kMinimumSize, partition_size - margin_size),
+                                              partition_size / 2);
+                    if (!builder->ResizePartition(partition, partition_size)) {
+                        LERROR << "resize " << partition_name;
+                        return false;
+                    }
                 }
                 if (!partition_create) DestroyLogicalPartition(partition_name, 10s);
                 changed = true;
diff --git a/fs_mgr/fs_mgr_priv.h b/fs_mgr/fs_mgr_priv.h
index 70abf5b..c36fd3d 100644
--- a/fs_mgr/fs_mgr_priv.h
+++ b/fs_mgr/fs_mgr_priv.h
@@ -99,7 +99,6 @@
 bool fs_mgr_is_device_unlocked();
 const std::string& get_android_dt_dir();
 bool is_dt_compatible();
-int load_verity_state(const android::fs_mgr::FstabEntry& entry, int* mode);
 
 bool fs_mgr_is_ext4(const std::string& blk_device);
 bool fs_mgr_is_f2fs(const std::string& blk_device);
diff --git a/fs_mgr/fs_mgr_remount.cpp b/fs_mgr/fs_mgr_remount.cpp
index fcacd2a..6482ed3 100644
--- a/fs_mgr/fs_mgr_remount.cpp
+++ b/fs_mgr/fs_mgr_remount.cpp
@@ -249,6 +249,7 @@
 
     // Check verity and optionally setup overlayfs backing.
     auto reboot_later = false;
+    auto user_please_reboot_later = false;
     auto uses_overlayfs = fs_mgr_overlayfs_valid() != OverlayfsValidResult::kNotSupported;
     for (auto it = partitions.begin(); it != partitions.end();) {
         auto& entry = *it;
@@ -262,7 +263,7 @@
                             false);
                     avb_ops_user_free(ops);
                     if (ret) {
-                        LOG(WARNING) << "Disable verity for " << mount_point;
+                        LOG(WARNING) << "Disabling verity for " << mount_point;
                         reboot_later = can_reboot;
                         if (reboot_later) {
                             // w/o overlayfs available, also check for dedupe
@@ -272,20 +273,22 @@
                             }
                             reboot(false);
                         }
+                        user_please_reboot_later = true;
                     } else if (fs_mgr_set_blk_ro(entry.blk_device, false)) {
                         fec::io fh(entry.blk_device.c_str(), O_RDWR);
                         if (fh && fh.set_verity_status(false)) {
-                            LOG(WARNING) << "Disable verity for " << mount_point;
+                            LOG(WARNING) << "Disabling verity for " << mount_point;
                             reboot_later = can_reboot;
                             if (reboot_later && !uses_overlayfs) {
                                 ++it;
                                 continue;
                             }
+                            user_please_reboot_later = true;
                         }
                     }
                 }
             }
-            LOG(ERROR) << "Skipping " << mount_point;
+            LOG(ERROR) << "Skipping " << mount_point << " for remount";
             it = partitions.erase(it);
             continue;
         }
@@ -307,6 +310,10 @@
 
     if (partitions.empty()) {
         if (reboot_later) reboot(false);
+        if (user_please_reboot_later) {
+            LOG(INFO) << "Now reboot your device for settings to take effect";
+            return 0;
+        }
         LOG(WARNING) << "No partitions to remount";
         return retval;
     }
@@ -383,6 +390,10 @@
     }
 
     if (reboot_later) reboot(false);
+    if (user_please_reboot_later) {
+        LOG(INFO) << "Now reboot your device for settings to take effect";
+        return 0;
+    }
 
     return retval;
 }
diff --git a/fs_mgr/fs_mgr_roots.cpp b/fs_mgr/fs_mgr_roots.cpp
index 58ef9b6..1e65587 100644
--- a/fs_mgr/fs_mgr_roots.cpp
+++ b/fs_mgr/fs_mgr_roots.cpp
@@ -101,7 +101,9 @@
         }
     }
 
-    auto mounted = GetMountState(rec->mount_point);
+    const std::string mount_point = mount_pt.empty() ? rec->mount_point : mount_pt;
+
+    auto mounted = GetMountState(mount_point);
     if (mounted == MountState::ERROR) {
         return false;
     }
@@ -109,8 +111,6 @@
         return true;
     }
 
-    const std::string mount_point = mount_pt.empty() ? rec->mount_point : mount_pt;
-
     static const std::vector<std::string> supported_fs{"ext4", "squashfs", "vfat", "f2fs", "none"};
     if (std::find(supported_fs.begin(), supported_fs.end(), rec->fs_type) == supported_fs.end()) {
         LERROR << "unknown fs_type \"" << rec->fs_type << "\" for " << mount_point;
diff --git a/fs_mgr/fs_mgr_verity.cpp b/fs_mgr/fs_mgr_verity.cpp
index 3f09157..1deb1ac 100644
--- a/fs_mgr/fs_mgr_verity.cpp
+++ b/fs_mgr/fs_mgr_verity.cpp
@@ -275,248 +275,6 @@
     return 0;
 }
 
-static int check_verity_restart(const char *fname)
-{
-    char buffer[VERITY_KMSG_BUFSIZE + 1];
-    int fd;
-    int rc = 0;
-    ssize_t size;
-    struct stat s;
-
-    fd = TEMP_FAILURE_RETRY(open(fname, O_RDONLY | O_CLOEXEC));
-
-    if (fd == -1) {
-        if (errno != ENOENT) {
-            PERROR << "Failed to open " << fname;
-        }
-        goto out;
-    }
-
-    if (fstat(fd, &s) == -1) {
-        PERROR << "Failed to fstat " << fname;
-        goto out;
-    }
-
-    size = VERITY_KMSG_BUFSIZE;
-
-    if (size > s.st_size) {
-        size = s.st_size;
-    }
-
-    if (lseek(fd, s.st_size - size, SEEK_SET) == -1) {
-        PERROR << "Failed to lseek " << (intmax_t)(s.st_size - size) << " " << fname;
-        goto out;
-    }
-
-    if (!android::base::ReadFully(fd, buffer, size)) {
-        PERROR << "Failed to read " << size << " bytes from " << fname;
-        goto out;
-    }
-
-    buffer[size] = '\0';
-
-    if (strstr(buffer, VERITY_KMSG_RESTART) != NULL) {
-        rc = 1;
-    }
-
-out:
-    if (fd != -1) {
-        close(fd);
-    }
-
-    return rc;
-}
-
-static int was_verity_restart()
-{
-    static const char* files[] = {
-        // clang-format off
-        "/sys/fs/pstore/console-ramoops-0",
-        "/sys/fs/pstore/console-ramoops",
-        "/proc/last_kmsg",
-        NULL
-        // clang-format on
-    };
-    int i;
-
-    for (i = 0; files[i]; ++i) {
-        if (check_verity_restart(files[i])) {
-            return 1;
-        }
-    }
-
-    return 0;
-}
-
-static int metadata_add(FILE *fp, long start, const char *tag,
-        unsigned int length, off64_t *offset)
-{
-    if (fseek(fp, start, SEEK_SET) < 0 ||
-        fprintf(fp, "%s %u\n", tag, length) < 0) {
-        return -1;
-    }
-
-    *offset = ftell(fp);
-
-    if (fseek(fp, length, SEEK_CUR) < 0 ||
-        fprintf(fp, METADATA_EOD " 0\n") < 0) {
-        return -1;
-    }
-
-    return 0;
-}
-
-static int metadata_find(const char *fname, const char *stag,
-        unsigned int slength, off64_t *offset)
-{
-    char tag[METADATA_TAG_MAX_LENGTH + 1];
-    int rc = -1;
-    int n;
-    long start = 0x4000; /* skip cryptfs metadata area */
-    uint32_t magic;
-    unsigned int length = 0;
-
-    if (!fname) {
-        return -1;
-    }
-
-    auto fp = std::unique_ptr<FILE, decltype(&fclose)>{fopen(fname, "re+"), fclose};
-
-    if (!fp) {
-        PERROR << "Failed to open " << fname;
-        return -1;
-    }
-
-    /* check magic */
-    if (fseek(fp.get(), start, SEEK_SET) < 0 || fread(&magic, sizeof(magic), 1, fp.get()) != 1) {
-        PERROR << "Failed to read magic from " << fname;
-        return -1;
-    }
-
-    if (magic != METADATA_MAGIC) {
-        magic = METADATA_MAGIC;
-
-        if (fseek(fp.get(), start, SEEK_SET) < 0 ||
-            fwrite(&magic, sizeof(magic), 1, fp.get()) != 1) {
-            PERROR << "Failed to write magic to " << fname;
-            return -1;
-        }
-
-        rc = metadata_add(fp.get(), start + sizeof(magic), stag, slength, offset);
-        if (rc < 0) {
-            PERROR << "Failed to add metadata to " << fname;
-        }
-
-        return rc;
-    }
-
-    start += sizeof(magic);
-
-    while (1) {
-        n = fscanf(fp.get(), "%" STRINGIFY(METADATA_TAG_MAX_LENGTH) "s %u\n", tag, &length);
-
-        if (n == 2 && strcmp(tag, METADATA_EOD)) {
-            /* found a tag */
-            start = ftell(fp.get());
-
-            if (!strcmp(tag, stag) && length == slength) {
-                *offset = start;
-                return 0;
-            }
-
-            start += length;
-
-            if (fseek(fp.get(), length, SEEK_CUR) < 0) {
-                PERROR << "Failed to seek " << fname;
-                return -1;
-            }
-        } else {
-            rc = metadata_add(fp.get(), start, stag, slength, offset);
-            if (rc < 0) {
-                PERROR << "Failed to write metadata to " << fname;
-            }
-            return rc;
-        }
-    }
-}
-
-static int write_verity_state(const char *fname, off64_t offset, int32_t mode)
-{
-    int fd;
-    int rc = -1;
-    struct verity_state s = { VERITY_STATE_HEADER, VERITY_STATE_VERSION, mode };
-
-    fd = TEMP_FAILURE_RETRY(open(fname, O_WRONLY | O_SYNC | O_CLOEXEC));
-
-    if (fd == -1) {
-        PERROR << "Failed to open " << fname;
-        goto out;
-    }
-
-    if (TEMP_FAILURE_RETRY(pwrite64(fd, &s, sizeof(s), offset)) != sizeof(s)) {
-        PERROR << "Failed to write " << sizeof(s) << " bytes to " << fname
-               << " to offset " << offset;
-        goto out;
-    }
-
-    rc = 0;
-
-out:
-    if (fd != -1) {
-        close(fd);
-    }
-
-    return rc;
-}
-
-static int read_verity_state(const char *fname, off64_t offset, int *mode)
-{
-    int fd = -1;
-    int rc = -1;
-    struct verity_state s;
-
-    fd = TEMP_FAILURE_RETRY(open(fname, O_RDONLY | O_CLOEXEC));
-
-    if (fd == -1) {
-        PERROR << "Failed to open " << fname;
-        goto out;
-    }
-
-    if (TEMP_FAILURE_RETRY(pread64(fd, &s, sizeof(s), offset)) != sizeof(s)) {
-        PERROR << "Failed to read " <<  sizeof(s) << " bytes from " << fname
-               << " offset " << offset;
-        goto out;
-    }
-
-    if (s.header != VERITY_STATE_HEADER) {
-        /* space allocated, but no state written. write default state */
-        *mode = VERITY_MODE_DEFAULT;
-        rc = write_verity_state(fname, offset, *mode);
-        goto out;
-    }
-
-    if (s.version != VERITY_STATE_VERSION) {
-        LERROR << "Unsupported verity state version (" << s.version << ")";
-        goto out;
-    }
-
-    if (s.mode < VERITY_MODE_EIO ||
-        s.mode > VERITY_MODE_LAST) {
-        LERROR << "Unsupported verity mode (" << s.mode << ")";
-        goto out;
-    }
-
-    *mode = s.mode;
-    rc = 0;
-
-out:
-    if (fd != -1) {
-        close(fd);
-    }
-
-    return rc;
-}
-
 static int read_partition(const char *path, uint64_t size)
 {
     char buf[READ_BUF_SIZE];
@@ -540,119 +298,23 @@
     return 0;
 }
 
-static int compare_last_signature(const FstabEntry& entry, int* match) {
-    char tag[METADATA_TAG_MAX_LENGTH + 1];
-    int fd = -1;
-    int rc = -1;
-    off64_t offset = 0;
-    struct fec_handle *f = NULL;
-    struct fec_verity_metadata verity;
-    uint8_t curr[SHA256_DIGEST_LENGTH];
-    uint8_t prev[SHA256_DIGEST_LENGTH];
-
-    *match = 1;
-
-    if (fec_open(&f, entry.blk_device.c_str(), O_RDONLY, FEC_VERITY_DISABLE, FEC_DEFAULT_ROOTS) ==
-        -1) {
-        PERROR << "Failed to open '" << entry.blk_device << "'";
-        return rc;
-    }
-
-    // read verity metadata
-    if (fec_verity_get_metadata(f, &verity) == -1) {
-        PERROR << "Failed to get verity metadata '" << entry.blk_device << "'";
-        goto out;
-    }
-
-    SHA256(verity.signature, sizeof(verity.signature), curr);
-
-    if (snprintf(tag, sizeof(tag), VERITY_LASTSIG_TAG "_%s", basename(entry.mount_point.c_str())) >=
-        (int)sizeof(tag)) {
-        LERROR << "Metadata tag name too long for " << entry.mount_point;
-        goto out;
-    }
-
-    if (metadata_find(entry.verity_loc.c_str(), tag, SHA256_DIGEST_LENGTH, &offset) < 0) {
-        goto out;
-    }
-
-    fd = TEMP_FAILURE_RETRY(open(entry.verity_loc.c_str(), O_RDWR | O_SYNC | O_CLOEXEC));
-
-    if (fd == -1) {
-        PERROR << "Failed to open " << entry.verity_loc;
-        goto out;
-    }
-
-    if (TEMP_FAILURE_RETRY(pread64(fd, prev, sizeof(prev), offset)) != sizeof(prev)) {
-        PERROR << "Failed to read " << sizeof(prev) << " bytes from " << entry.verity_loc
-               << " offset " << offset;
-        goto out;
-    }
-
-    *match = !memcmp(curr, prev, SHA256_DIGEST_LENGTH);
-
-    if (!*match) {
-        /* update current signature hash */
-        if (TEMP_FAILURE_RETRY(pwrite64(fd, curr, sizeof(curr),
-                offset)) != sizeof(curr)) {
-            PERROR << "Failed to write " << sizeof(curr) << " bytes to " << entry.verity_loc
-                   << " offset " << offset;
-            goto out;
-        }
-    }
-
-    rc = 0;
-
-out:
-    fec_close(f);
-    return rc;
-}
-
-static int get_verity_state_offset(const FstabEntry& entry, off64_t* offset) {
-    char tag[METADATA_TAG_MAX_LENGTH + 1];
-
-    if (snprintf(tag, sizeof(tag), VERITY_STATE_TAG "_%s", basename(entry.mount_point.c_str())) >=
-        (int)sizeof(tag)) {
-        LERROR << "Metadata tag name too long for " << entry.mount_point;
-        return -1;
-    }
-
-    return metadata_find(entry.verity_loc.c_str(), tag, sizeof(struct verity_state), offset);
-}
-
-int load_verity_state(const FstabEntry& entry, int* mode) {
+bool fs_mgr_load_verity_state(int* mode) {
     // unless otherwise specified, use EIO mode.
     *mode = VERITY_MODE_EIO;
 
-    // use the kernel parameter if set.
-    std::string veritymode;
-    if (fs_mgr_get_boot_config("veritymode", &veritymode)) {
-        if (veritymode == "enforcing") {
-            *mode = VERITY_MODE_DEFAULT;
-        }
-        return 0;
+    // The bootloader communicates verity mode via the kernel commandline
+    std::string verity_mode;
+    if (!fs_mgr_get_boot_config("veritymode", &verity_mode)) {
+        return false;
     }
 
-    off64_t offset = 0;
-    if (get_verity_state_offset(entry, &offset) < 0) {
-        /* fall back to stateless behavior */
-        return 0;
-    }
-
-    if (was_verity_restart()) {
-        /* device was restarted after dm-verity detected a corrupted
-         * block, so use EIO mode */
-        return write_verity_state(entry.verity_loc.c_str(), offset, *mode);
-    }
-
-    int match = 0;
-    if (!compare_last_signature(entry, &match) && !match) {
-        /* partition has been reflashed, reset dm-verity state */
+    if (verity_mode == "enforcing") {
         *mode = VERITY_MODE_DEFAULT;
-        return write_verity_state(entry.verity_loc.c_str(), offset, *mode);
+    } else if (verity_mode == "logging") {
+        *mode = VERITY_MODE_LOGGING;
     }
 
-    return read_verity_state(entry.verity_loc.c_str(), offset, mode);
+    return true;
 }
 
 // Update the verity table using the actual block device path.
@@ -759,7 +421,7 @@
 
     params.ecc_dev = entry->blk_device.c_str();
 
-    if (load_verity_state(*entry, &params.mode) < 0) {
+    if (!fs_mgr_load_verity_state(&params.mode)) {
         /* if accessing or updating the state failed, switch to the default
          * safe mode. This makes sure the device won't end up in an endless
          * restart loop, and no corrupted data will be exposed to userspace
diff --git a/fs_mgr/include_fstab/fstab/fstab.h b/fs_mgr/include_fstab/fstab/fstab.h
index d7afed6..c7193ab 100644
--- a/fs_mgr/include_fstab/fstab/fstab.h
+++ b/fs_mgr/include_fstab/fstab/fstab.h
@@ -38,7 +38,6 @@
     std::string fs_options;
     std::string key_loc;
     std::string key_dir;
-    std::string verity_loc;
     off64_t length = 0;
     std::string label;
     int partnum = -1;
diff --git a/fs_mgr/libdm/dm.cpp b/fs_mgr/libdm/dm.cpp
index a4614d0..c2917a4 100644
--- a/fs_mgr/libdm/dm.cpp
+++ b/fs_mgr/libdm/dm.cpp
@@ -210,6 +210,20 @@
     return true;
 }
 
+bool DeviceMapper::GetTargetByName(const std::string& name, DmTargetTypeInfo* info) {
+    std::vector<DmTargetTypeInfo> targets;
+    if (!GetAvailableTargets(&targets)) {
+        return false;
+    }
+    for (const auto& target : targets) {
+        if (target.name() == name) {
+            if (info) *info = target;
+            return true;
+        }
+    }
+    return false;
+}
+
 bool DeviceMapper::GetAvailableDevices(std::vector<DmBlockDevice>* devices) {
     devices->clear();
 
diff --git a/fs_mgr/libdm/dm_target.cpp b/fs_mgr/libdm/dm_target.cpp
index cb33eea..da1013e 100644
--- a/fs_mgr/libdm/dm_target.cpp
+++ b/fs_mgr/libdm/dm_target.cpp
@@ -16,8 +16,12 @@
 
 #include "libdm/dm_target.h"
 
+#include <stdio.h>
+#include <sys/types.h>
+
 #include <android-base/logging.h>
 #include <android-base/macros.h>
+#include <android-base/parseint.h>
 #include <android-base/strings.h>
 
 #include <libdm/dm.h>
@@ -115,5 +119,107 @@
     return keyid_ + " " + block_device_;
 }
 
+std::string DmTargetSnapshot::name() const {
+    if (mode_ == SnapshotStorageMode::Merge) {
+        return "snapshot-merge";
+    }
+    return "snapshot";
+}
+
+std::string DmTargetSnapshot::GetParameterString() const {
+    std::string mode;
+    switch (mode_) {
+        case SnapshotStorageMode::Persistent:
+        case SnapshotStorageMode::Merge:
+            // Note: "O" lets us query for overflow in the status message. This
+            // is only supported on kernels 4.4+. On earlier kernels, an overflow
+            // will be reported as "Invalid" in the status string.
+            mode = "P";
+            if (ReportsOverflow(name())) {
+                mode += "O";
+            }
+            break;
+        case SnapshotStorageMode::Transient:
+            mode = "N";
+            break;
+        default:
+            LOG(ERROR) << "DmTargetSnapshot unknown mode";
+            break;
+    }
+    return base_device_ + " " + cow_device_ + " " + mode + " " + std::to_string(chunk_size_);
+}
+
+bool DmTargetSnapshot::ReportsOverflow(const std::string& target_type) {
+    DeviceMapper& dm = DeviceMapper::Instance();
+    DmTargetTypeInfo info;
+    if (!dm.GetTargetByName(target_type, &info)) {
+        return false;
+    }
+    if (target_type == "snapshot") {
+        return info.IsAtLeast(1, 15, 0);
+    }
+    if (target_type == "snapshot-merge") {
+        return info.IsAtLeast(1, 4, 0);
+    }
+    return false;
+}
+
+bool DmTargetSnapshot::ParseStatusText(const std::string& text, Status* status) {
+    auto sections = android::base::Split(text, " ");
+    if (sections.size() == 1) {
+        // This is probably an error code, "Invalid" is possible as is "Overflow"
+        // on 4.4+.
+        status->error = text;
+        return true;
+    }
+    if (sections.size() != 2) {
+        LOG(ERROR) << "snapshot status should have two components";
+        return false;
+    }
+    auto sector_info = android::base::Split(sections[0], "/");
+    if (sector_info.size() != 2) {
+        LOG(ERROR) << "snapshot sector info should have two components";
+        return false;
+    }
+    if (!android::base::ParseUint(sections[1], &status->metadata_sectors)) {
+        LOG(ERROR) << "could not parse metadata sectors";
+        return false;
+    }
+    if (!android::base::ParseUint(sector_info[0], &status->sectors_allocated)) {
+        LOG(ERROR) << "could not parse sectors allocated";
+        return false;
+    }
+    if (!android::base::ParseUint(sector_info[1], &status->total_sectors)) {
+        LOG(ERROR) << "could not parse total sectors";
+        return false;
+    }
+    return true;
+}
+
+std::string DmTargetCrypt::GetParameterString() const {
+    std::vector<std::string> argv = {
+            cipher_,
+            key_,
+            std::to_string(iv_sector_offset_),
+            device_,
+            std::to_string(device_sector_),
+    };
+
+    std::vector<std::string> extra_argv;
+    if (allow_discards_) extra_argv.emplace_back("allow_discards");
+    if (allow_encrypt_override_) extra_argv.emplace_back("allow_encrypt_override");
+    if (iv_large_sectors_) extra_argv.emplace_back("iv_large_sectors");
+    if (sector_size_) extra_argv.emplace_back("sector_size:" + std::to_string(sector_size_));
+
+    if (!extra_argv.empty()) argv.emplace_back(std::to_string(extra_argv.size()));
+
+    argv.insert(argv.end(), extra_argv.begin(), extra_argv.end());
+    return android::base::Join(argv, " ");
+}
+
+std::string DmTargetDefaultKey::GetParameterString() const {
+    return cipher_ + " " + key_ + " " + blockdev_ + " " + std::to_string(start_sector_);
+}
+
 }  // namespace dm
 }  // namespace android
diff --git a/fs_mgr/libdm/dm_test.cpp b/fs_mgr/libdm/dm_test.cpp
index 70823c6..dc47c33 100644
--- a/fs_mgr/libdm/dm_test.cpp
+++ b/fs_mgr/libdm/dm_test.cpp
@@ -24,6 +24,7 @@
 
 #include <chrono>
 #include <ctime>
+#include <iostream>
 #include <map>
 #include <thread>
 
@@ -35,21 +36,15 @@
 #include "test_util.h"
 
 using namespace std;
+using namespace std::chrono_literals;
 using namespace android::dm;
 using unique_fd = android::base::unique_fd;
 
 TEST(libdm, HasMinimumTargets) {
+    DmTargetTypeInfo info;
+
     DeviceMapper& dm = DeviceMapper::Instance();
-    vector<DmTargetTypeInfo> targets;
-    ASSERT_TRUE(dm.GetAvailableTargets(&targets));
-
-    map<string, DmTargetTypeInfo> by_name;
-    for (const auto& target : targets) {
-        by_name[target.name()] = target;
-    }
-
-    auto iter = by_name.find("linear");
-    EXPECT_NE(iter, by_name.end());
+    ASSERT_TRUE(dm.GetTargetByName("linear", &info));
 }
 
 // Helper to ensure that device mapper devices are released.
@@ -201,3 +196,268 @@
             "2 fec_blocks 126955 fec_start 126955 restart_on_corruption ignore_zero_blocks";
     EXPECT_EQ(target.GetParameterString(), expected);
 }
+
+TEST(libdm, DmSnapshotArgs) {
+    DmTargetSnapshot target1(0, 512, "base", "cow", SnapshotStorageMode::Persistent, 8);
+    if (DmTargetSnapshot::ReportsOverflow("snapshot")) {
+        EXPECT_EQ(target1.GetParameterString(), "base cow PO 8");
+    } else {
+        EXPECT_EQ(target1.GetParameterString(), "base cow P 8");
+    }
+    EXPECT_EQ(target1.name(), "snapshot");
+
+    DmTargetSnapshot target2(0, 512, "base", "cow", SnapshotStorageMode::Transient, 8);
+    EXPECT_EQ(target2.GetParameterString(), "base cow N 8");
+    EXPECT_EQ(target2.name(), "snapshot");
+
+    DmTargetSnapshot target3(0, 512, "base", "cow", SnapshotStorageMode::Merge, 8);
+    if (DmTargetSnapshot::ReportsOverflow("snapshot-merge")) {
+        EXPECT_EQ(target3.GetParameterString(), "base cow PO 8");
+    } else {
+        EXPECT_EQ(target3.GetParameterString(), "base cow P 8");
+    }
+    EXPECT_EQ(target3.name(), "snapshot-merge");
+}
+
+TEST(libdm, DmSnapshotOriginArgs) {
+    DmTargetSnapshotOrigin target(0, 512, "base");
+    EXPECT_EQ(target.GetParameterString(), "base");
+    EXPECT_EQ(target.name(), "snapshot-origin");
+}
+
+class SnapshotTestHarness final {
+  public:
+    bool Setup();
+    bool Merge();
+
+    std::string origin_dev() const { return origin_dev_->path(); }
+    std::string snapshot_dev() const { return snapshot_dev_->path(); }
+
+    int base_fd() const { return base_fd_; }
+
+    static const uint64_t kBaseDeviceSize = 1024 * 1024;
+    static const uint64_t kCowDeviceSize = 1024 * 64;
+    static const uint64_t kSectorSize = 512;
+
+  private:
+    void SetupImpl();
+    void MergeImpl();
+
+    unique_fd base_fd_;
+    unique_fd cow_fd_;
+    unique_ptr<LoopDevice> base_loop_;
+    unique_ptr<LoopDevice> cow_loop_;
+    unique_ptr<TempDevice> origin_dev_;
+    unique_ptr<TempDevice> snapshot_dev_;
+    bool setup_ok_ = false;
+    bool merge_ok_ = false;
+};
+
+bool SnapshotTestHarness::Setup() {
+    SetupImpl();
+    return setup_ok_;
+}
+
+void SnapshotTestHarness::SetupImpl() {
+    base_fd_ = CreateTempFile("base_device", kBaseDeviceSize);
+    ASSERT_GE(base_fd_, 0);
+    cow_fd_ = CreateTempFile("cow_device", kCowDeviceSize);
+    ASSERT_GE(cow_fd_, 0);
+
+    base_loop_ = std::make_unique<LoopDevice>(base_fd_);
+    ASSERT_TRUE(base_loop_->valid());
+    cow_loop_ = std::make_unique<LoopDevice>(cow_fd_);
+    ASSERT_TRUE(cow_loop_->valid());
+
+    DmTable origin_table;
+    ASSERT_TRUE(origin_table.AddTarget(make_unique<DmTargetSnapshotOrigin>(
+            0, kBaseDeviceSize / kSectorSize, base_loop_->device())));
+    ASSERT_TRUE(origin_table.valid());
+
+    origin_dev_ = std::make_unique<TempDevice>("libdm-test-dm-snapshot-origin", origin_table);
+    ASSERT_TRUE(origin_dev_->valid());
+    ASSERT_FALSE(origin_dev_->path().empty());
+    ASSERT_TRUE(origin_dev_->WaitForUdev());
+
+    // chunk size = 4K blocks.
+    DmTable snap_table;
+    ASSERT_TRUE(snap_table.AddTarget(make_unique<DmTargetSnapshot>(
+            0, kBaseDeviceSize / kSectorSize, base_loop_->device(), cow_loop_->device(),
+            SnapshotStorageMode::Persistent, 8)));
+    ASSERT_TRUE(snap_table.valid());
+
+    snapshot_dev_ = std::make_unique<TempDevice>("libdm-test-dm-snapshot", snap_table);
+    ASSERT_TRUE(snapshot_dev_->valid());
+    ASSERT_FALSE(snapshot_dev_->path().empty());
+    ASSERT_TRUE(snapshot_dev_->WaitForUdev());
+
+    setup_ok_ = true;
+}
+
+bool SnapshotTestHarness::Merge() {
+    MergeImpl();
+    return merge_ok_;
+}
+
+void SnapshotTestHarness::MergeImpl() {
+    DmTable merge_table;
+    ASSERT_TRUE(merge_table.AddTarget(
+            make_unique<DmTargetSnapshot>(0, kBaseDeviceSize / kSectorSize, base_loop_->device(),
+                                          cow_loop_->device(), SnapshotStorageMode::Merge, 8)));
+    ASSERT_TRUE(merge_table.valid());
+
+    DeviceMapper& dm = DeviceMapper::Instance();
+    ASSERT_TRUE(dm.LoadTableAndActivate("libdm-test-dm-snapshot", merge_table));
+
+    while (true) {
+        vector<DeviceMapper::TargetInfo> status;
+        ASSERT_TRUE(dm.GetTableStatus("libdm-test-dm-snapshot", &status));
+        ASSERT_EQ(status.size(), 1);
+        ASSERT_EQ(strncmp(status[0].spec.target_type, "snapshot-merge", strlen("snapshot-merge")),
+                  0);
+
+        DmTargetSnapshot::Status merge_status;
+        ASSERT_TRUE(DmTargetSnapshot::ParseStatusText(status[0].data, &merge_status));
+        ASSERT_TRUE(merge_status.error.empty());
+        if (merge_status.sectors_allocated == merge_status.metadata_sectors) {
+            break;
+        }
+
+        std::this_thread::sleep_for(250ms);
+    }
+
+    merge_ok_ = true;
+}
+
+bool CheckSnapshotAvailability() {
+    DmTargetTypeInfo info;
+
+    DeviceMapper& dm = DeviceMapper::Instance();
+    if (!dm.GetTargetByName("snapshot", &info)) {
+        cout << "snapshot module not enabled; skipping test" << std::endl;
+        return false;
+    }
+    if (!dm.GetTargetByName("snapshot-merge", &info)) {
+        cout << "snapshot-merge module not enabled; skipping test" << std::endl;
+        return false;
+    }
+    if (!dm.GetTargetByName("snapshot-origin", &info)) {
+        cout << "snapshot-origin module not enabled; skipping test" << std::endl;
+        return false;
+    }
+    return true;
+}
+
+TEST(libdm, DmSnapshot) {
+    if (!CheckSnapshotAvailability()) {
+        return;
+    }
+
+    SnapshotTestHarness harness;
+    ASSERT_TRUE(harness.Setup());
+
+    // Open the dm devices.
+    unique_fd origin_fd(open(harness.origin_dev().c_str(), O_RDONLY | O_CLOEXEC));
+    ASSERT_GE(origin_fd, 0);
+    unique_fd snapshot_fd(open(harness.snapshot_dev().c_str(), O_RDWR | O_CLOEXEC | O_SYNC));
+    ASSERT_GE(snapshot_fd, 0);
+
+    // Write to the first block of the snapshot device.
+    std::string data("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz");
+    ASSERT_TRUE(android::base::WriteFully(snapshot_fd, data.data(), data.size()));
+    ASSERT_EQ(lseek(snapshot_fd, 0, SEEK_SET), 0);
+
+    // We should get the same data back from the snapshot device.
+    std::string read(data.size(), '\0');
+    ASSERT_TRUE(android::base::ReadFully(snapshot_fd, read.data(), read.size()));
+    ASSERT_EQ(read, data);
+
+    // We should see the original data from the origin device.
+    std::string zeroes(data.size(), '\0');
+    ASSERT_TRUE(android::base::ReadFully(origin_fd, read.data(), read.size()));
+    ASSERT_EQ(lseek(snapshot_fd, 0, SEEK_SET), 0);
+    ASSERT_EQ(read, zeroes);
+
+    // We should also see the original data from the base device.
+    ASSERT_TRUE(android::base::ReadFully(harness.base_fd(), read.data(), read.size()));
+    ASSERT_EQ(lseek(harness.base_fd(), 0, SEEK_SET), 0);
+    ASSERT_EQ(read, zeroes);
+
+    // Now, perform the merge and wait.
+    ASSERT_TRUE(harness.Merge());
+
+    // Reading from the base device should give us the modified data.
+    ASSERT_TRUE(android::base::ReadFully(harness.base_fd(), read.data(), read.size()));
+    ASSERT_EQ(lseek(harness.base_fd(), 0, SEEK_SET), 0);
+    ASSERT_EQ(read, data);
+}
+
+TEST(libdm, DmSnapshotOverflow) {
+    if (!CheckSnapshotAvailability()) {
+        return;
+    }
+
+    SnapshotTestHarness harness;
+    ASSERT_TRUE(harness.Setup());
+
+    // Open the dm devices.
+    unique_fd snapshot_fd(open(harness.snapshot_dev().c_str(), O_RDWR | O_CLOEXEC));
+    ASSERT_GE(snapshot_fd, 0);
+
+    // Fill the copy-on-write device until it overflows.
+    uint64_t bytes_remaining = SnapshotTestHarness::kCowDeviceSize;
+    uint8_t byte = 1;
+    while (bytes_remaining) {
+        std::string data(4096, char(byte));
+        if (!android::base::WriteFully(snapshot_fd, data.data(), data.size())) {
+            ASSERT_EQ(errno, EIO);
+            break;
+        }
+        bytes_remaining -= data.size();
+    }
+
+    // If writes succeed (because they are buffered), then we should expect an
+    // fsync to fail with EIO.
+    if (!bytes_remaining) {
+        ASSERT_EQ(fsync(snapshot_fd), -1);
+        ASSERT_EQ(errno, EIO);
+    }
+
+    DeviceMapper& dm = DeviceMapper::Instance();
+
+    vector<DeviceMapper::TargetInfo> target_status;
+    ASSERT_TRUE(dm.GetTableStatus("libdm-test-dm-snapshot", &target_status));
+    ASSERT_EQ(target_status.size(), 1);
+    ASSERT_EQ(strncmp(target_status[0].spec.target_type, "snapshot", strlen("snapshot")), 0);
+
+    DmTargetSnapshot::Status status;
+    ASSERT_TRUE(DmTargetSnapshot::ParseStatusText(target_status[0].data, &status));
+    if (DmTargetSnapshot::ReportsOverflow("snapshot")) {
+        ASSERT_EQ(status.error, "Overflow");
+    } else {
+        ASSERT_EQ(status.error, "Invalid");
+    }
+}
+
+TEST(libdm, CryptArgs) {
+    DmTargetCrypt target1(0, 512, "sha1", "abcdefgh", 50, "/dev/loop0", 100);
+    ASSERT_EQ(target1.name(), "crypt");
+    ASSERT_TRUE(target1.Valid());
+    ASSERT_EQ(target1.GetParameterString(), "sha1 abcdefgh 50 /dev/loop0 100");
+
+    DmTargetCrypt target2(0, 512, "sha1", "abcdefgh", 50, "/dev/loop0", 100);
+    target2.SetSectorSize(64);
+    target2.AllowDiscards();
+    target2.SetIvLargeSectors();
+    target2.AllowEncryptOverride();
+    ASSERT_EQ(target2.GetParameterString(),
+              "sha1 abcdefgh 50 /dev/loop0 100 4 allow_discards allow_encrypt_override "
+              "iv_large_sectors sector_size:64");
+}
+
+TEST(libdm, DefaultKeyArgs) {
+    DmTargetDefaultKey target(0, 4096, "AES-256-XTS", "abcdef0123456789", "/dev/loop0", 0);
+    ASSERT_EQ(target.name(), "default-key");
+    ASSERT_TRUE(target.Valid());
+    ASSERT_EQ(target.GetParameterString(), "AES-256-XTS abcdef0123456789 /dev/loop0 0");
+}
diff --git a/fs_mgr/libdm/include/libdm/dm.h b/fs_mgr/libdm/include/libdm/dm.h
index 28e6e01..d7e8aa9 100644
--- a/fs_mgr/libdm/include/libdm/dm.h
+++ b/fs_mgr/libdm/include/libdm/dm.h
@@ -96,6 +96,10 @@
     // successfully read and stored in 'targets'. Returns 'false' otherwise.
     bool GetAvailableTargets(std::vector<DmTargetTypeInfo>* targets);
 
+    // Finds a target by name and returns its information if found. |info| may
+    // be null to check for the existence of a target.
+    bool GetTargetByName(const std::string& name, DmTargetTypeInfo* info);
+
     // Return 'true' if it can successfully read the list of device mapper block devices
     // currently created. 'devices' will be empty if the kernel interactions
     // were successful and there are no block devices at the moment. Returns
diff --git a/fs_mgr/libdm/include/libdm/dm_table.h b/fs_mgr/libdm/include/libdm/dm_table.h
index 5c639be..ee66653 100644
--- a/fs_mgr/libdm/include/libdm/dm_table.h
+++ b/fs_mgr/libdm/include/libdm/dm_table.h
@@ -43,12 +43,20 @@
     // successfully removed.
     bool RemoveTarget(std::unique_ptr<DmTarget>&& target);
 
+    // Adds a target, constructing it in-place for convenience. For example,
+    //
+    //   table.Emplace<DmTargetZero>(0, num_sectors);
+    template <typename T, typename... Args>
+    bool Emplace(Args&&... args) {
+        return AddTarget(std::make_unique<T>(std::forward<Args>(args)...));
+    }
+
     // Checks the table to make sure it is valid. i.e. Checks for range overlaps, range gaps
     // and returns 'true' if the table is ready to be loaded into kernel. Returns 'false' if the
     // table is malformed.
     bool valid() const;
 
-    // Returns the toatl number of targets.
+    // Returns the total number of targets.
     size_t num_targets() const { return targets_.size(); }
 
     // Returns the total size represented by the table in terms of number of 512-byte sectors.
diff --git a/fs_mgr/libdm/include/libdm/dm_target.h b/fs_mgr/libdm/include/libdm/dm_target.h
index 175b0f0..722922d 100644
--- a/fs_mgr/libdm/include/libdm/dm_target.h
+++ b/fs_mgr/libdm/include/libdm/dm_target.h
@@ -40,6 +40,18 @@
         return std::to_string(major_) + "." + std::to_string(minor_) + "." + std::to_string(patch_);
     }
 
+    uint32_t major_version() const { return major_; }
+    uint32_t minor_version() const { return minor_; }
+    uint32_t patch_level() const { return patch_; }
+
+    bool IsAtLeast(uint32_t major, uint32_t minor, uint32_t patch) const {
+        if (major_ > major) return true;
+        if (major_ < major) return false;
+        if (minor_ > minor) return true;
+        if (minor_ < minor) return false;
+        return patch_ >= patch;
+    }
+
   private:
     std::string name_;
     uint32_t major_;
@@ -170,6 +182,119 @@
     std::string target_string_;
 };
 
+enum class SnapshotStorageMode {
+    // The snapshot will be persisted to the COW device.
+    Persistent,
+    // The snapshot will be lost on reboot.
+    Transient,
+    // The snapshot will be merged from the COW device into the base device,
+    // in the background.
+    Merge
+};
+
+// Writes to a snapshot device will be written to the given COW device. Reads
+// will read from the COW device or base device. The chunk size is specified
+// in sectors.
+class DmTargetSnapshot final : public DmTarget {
+  public:
+    DmTargetSnapshot(uint64_t start, uint64_t length, const std::string& base_device,
+                     const std::string& cow_device, SnapshotStorageMode mode, uint64_t chunk_size)
+        : DmTarget(start, length),
+          base_device_(base_device),
+          cow_device_(cow_device),
+          mode_(mode),
+          chunk_size_(chunk_size) {}
+
+    std::string name() const override;
+    std::string GetParameterString() const override;
+    bool Valid() const override { return true; }
+
+    struct Status {
+        uint64_t sectors_allocated;
+        uint64_t total_sectors;
+        uint64_t metadata_sectors;
+        std::string error;
+    };
+
+    static bool ParseStatusText(const std::string& text, Status* status);
+    static bool ReportsOverflow(const std::string& target_type);
+
+  private:
+    std::string base_device_;
+    std::string cow_device_;
+    SnapshotStorageMode mode_;
+    uint64_t chunk_size_;
+};
+
+// snapshot-origin will read/write directly to the backing device, updating any
+// snapshot devices with a matching origin.
+class DmTargetSnapshotOrigin final : public DmTarget {
+  public:
+    DmTargetSnapshotOrigin(uint64_t start, uint64_t length, const std::string& device)
+        : DmTarget(start, length), device_(device) {}
+
+    std::string name() const override { return "snapshot-origin"; }
+    std::string GetParameterString() const override { return device_; }
+    bool Valid() const override { return true; }
+
+  private:
+    std::string device_;
+};
+
+class DmTargetCrypt final : public DmTarget {
+  public:
+    DmTargetCrypt(uint64_t start, uint64_t length, const std::string& cipher,
+                  const std::string& key, uint64_t iv_sector_offset, const std::string& device,
+                  uint64_t device_sector)
+        : DmTarget(start, length),
+          cipher_(cipher),
+          key_(key),
+          iv_sector_offset_(iv_sector_offset),
+          device_(device),
+          device_sector_(device_sector) {}
+
+    void AllowDiscards() { allow_discards_ = true; }
+    void AllowEncryptOverride() { allow_encrypt_override_ = true; }
+    void SetIvLargeSectors() { iv_large_sectors_ = true; }
+    void SetSectorSize(uint32_t sector_size) { sector_size_ = sector_size; }
+
+    std::string name() const override { return "crypt"; }
+    bool Valid() const override { return true; }
+    std::string GetParameterString() const override;
+
+  private:
+    std::string cipher_;
+    std::string key_;
+    uint64_t iv_sector_offset_;
+    std::string device_;
+    uint64_t device_sector_;
+    bool allow_discards_ = false;
+    bool allow_encrypt_override_ = false;
+    bool iv_large_sectors_ = false;
+    uint32_t sector_size_ = 0;
+};
+
+class DmTargetDefaultKey final : public DmTarget {
+  public:
+    DmTargetDefaultKey(uint64_t start, uint64_t length, const std::string& cipher,
+                       const std::string& key, const std::string& blockdev, uint64_t start_sector)
+        : DmTarget(start, length),
+          cipher_(cipher),
+          key_(key),
+          blockdev_(blockdev),
+          start_sector_(start_sector) {}
+
+    std::string name() const override { return "default-key"; }
+    bool Valid() const override { return true; }
+    std::string GetParameterString() const override;
+
+  private:
+    std::string cipher_;
+    std::string key_;
+    std::string blockdev_;
+    uint64_t start_sector_;
+};
+
 }  // namespace dm
 }  // namespace android
 
diff --git a/fs_mgr/liblp/builder.cpp b/fs_mgr/liblp/builder.cpp
index 27222af..41c01da 100644
--- a/fs_mgr/liblp/builder.cpp
+++ b/fs_mgr/liblp/builder.cpp
@@ -1057,7 +1057,7 @@
     if (sABOverrideSet) {
         return sABOverrideValue;
     }
-    return android::base::GetBoolProperty("ro.build.ab_update", false);
+    return !android::base::GetProperty("ro.boot.slot_suffix", "").empty();
 }
 
 bool MetadataBuilder::IsRetrofitDevice() const {
diff --git a/fs_mgr/liblp/partition_opener.cpp b/fs_mgr/liblp/partition_opener.cpp
index bb8ec9c..3b12213 100644
--- a/fs_mgr/liblp/partition_opener.cpp
+++ b/fs_mgr/liblp/partition_opener.cpp
@@ -26,6 +26,7 @@
 #include <unistd.h>
 
 #include <android-base/file.h>
+#include <android-base/strings.h>
 
 #include "utility.h"
 
@@ -37,7 +38,7 @@
 namespace {
 
 std::string GetPartitionAbsolutePath(const std::string& path) {
-    if (path[0] == '/') {
+    if (android::base::StartsWith(path, "/")) {
         return path;
     }
     return "/dev/block/by-name/" + path;
diff --git a/fs_mgr/tests/adb-remount-sh.xml b/fs_mgr/tests/adb-remount-sh.xml
index 716e324..fa0d63f 100644
--- a/fs_mgr/tests/adb-remount-sh.xml
+++ b/fs_mgr/tests/adb-remount-sh.xml
@@ -18,6 +18,8 @@
     <!-- This test requires a device, so it's not annotated with a null-device -->
     <test class="com.android.tradefed.testtype.binary.ExecutableHostTest" >
         <option name="binary" value="adb-remount-test.sh" />
+        <!-- Increase default timeout as script is quite long -->
+        <option name="per-binary-timeout" value="1h" />
     </test>
 </configuration>
 
diff --git a/fs_mgr/tests/fs_mgr_test.cpp b/fs_mgr/tests/fs_mgr_test.cpp
index 72afa69..6d87594 100644
--- a/fs_mgr/tests/fs_mgr_test.cpp
+++ b/fs_mgr/tests/fs_mgr_test.cpp
@@ -394,7 +394,7 @@
     std::string fstab_contents = R"fs(
 source none0       swap   defaults      encryptable,forceencrypt,fileencryption,forcefdeorfbe,keydirectory,length,swapprio,zramsize,max_comp_streams,reservedsize,eraseblk,logicalblk,sysfs_path,zram_loopback_path,zram_loopback_size,zram_backing_dev_path
 
-source none1       swap   defaults      encryptable=,forceencrypt=,fileencryption=,keydirectory=,length=,swapprio=,zramsize=,max_comp_streams=,verify=,avb=,reservedsize=,eraseblk=,logicalblk=,sysfs_path=,zram_loopback_path=,zram_loopback_size=,zram_backing_dev_path=
+source none1       swap   defaults      encryptable=,forceencrypt=,fileencryption=,keydirectory=,length=,swapprio=,zramsize=,max_comp_streams=,avb=,reservedsize=,eraseblk=,logicalblk=,sysfs_path=,zram_loopback_path=,zram_loopback_size=,zram_backing_dev_path=
 
 source none2       swap   defaults      forcefdeorfbe=
 
@@ -413,7 +413,6 @@
     }
     EXPECT_EQ("", entry->key_loc);
     EXPECT_EQ("", entry->key_dir);
-    EXPECT_EQ("", entry->verity_loc);
     EXPECT_EQ(0, entry->length);
     EXPECT_EQ("", entry->label);
     EXPECT_EQ(-1, entry->partnum);
@@ -437,13 +436,11 @@
         flags.crypt = true;
         flags.force_crypt = true;
         flags.file_encryption = true;
-        flags.verify = true;
         flags.avb = true;
         EXPECT_TRUE(CompareFlags(flags, entry->fs_mgr_flags));
     }
     EXPECT_EQ("", entry->key_loc);
     EXPECT_EQ("", entry->key_dir);
-    EXPECT_EQ("", entry->verity_loc);
     EXPECT_EQ(0, entry->length);
     EXPECT_EQ("", entry->label);
     EXPECT_EQ(-1, entry->partnum);
@@ -639,29 +636,6 @@
     EXPECT_EQ(0, entry->zram_size);
 }
 
-TEST(fs_mgr, ReadFstabFromFile_FsMgrOptions_Verify) {
-    TemporaryFile tf;
-    ASSERT_TRUE(tf.fd != -1);
-    std::string fstab_contents = R"fs(
-source none0       swap   defaults      verify=/dir/key
-)fs";
-
-    ASSERT_TRUE(android::base::WriteStringToFile(fstab_contents, tf.path));
-
-    Fstab fstab;
-    EXPECT_TRUE(ReadFstabFromFile(tf.path, &fstab));
-    ASSERT_EQ(1U, fstab.size());
-
-    auto entry = fstab.begin();
-    EXPECT_EQ("none0", entry->mount_point);
-
-    FstabEntry::FsMgrFlags flags = {};
-    flags.verify = true;
-    EXPECT_TRUE(CompareFlags(flags, entry->fs_mgr_flags));
-
-    EXPECT_EQ("/dir/key", entry->verity_loc);
-}
-
 TEST(fs_mgr, ReadFstabFromFile_FsMgrOptions_ForceEncrypt) {
     TemporaryFile tf;
     ASSERT_TRUE(tf.fd != -1);
diff --git a/fs_mgr/tools/dmctl.cpp b/fs_mgr/tools/dmctl.cpp
index 9309aad..7e6ad5b 100644
--- a/fs_mgr/tools/dmctl.cpp
+++ b/fs_mgr/tools/dmctl.cpp
@@ -38,15 +38,7 @@
 #include <vector>
 
 using namespace std::literals::string_literals;
-
-using DeviceMapper = ::android::dm::DeviceMapper;
-using DmTable = ::android::dm::DmTable;
-using DmTarget = ::android::dm::DmTarget;
-using DmTargetLinear = ::android::dm::DmTargetLinear;
-using DmTargetZero = ::android::dm::DmTargetZero;
-using DmTargetAndroidVerity = ::android::dm::DmTargetAndroidVerity;
-using DmTargetBow = ::android::dm::DmTargetBow;
-using DmTargetTypeInfo = ::android::dm::DmTargetTypeInfo;
+using namespace android::dm;
 using DmBlockDevice = ::android::dm::DeviceMapper::DmBlockDevice;
 
 static int Usage(void) {
@@ -57,6 +49,7 @@
     std::cerr << "  delete <dm-name>" << std::endl;
     std::cerr << "  list <devices | targets> [-v]" << std::endl;
     std::cerr << "  getpath <dm-name>" << std::endl;
+    std::cerr << "  status <dm-name>" << std::endl;
     std::cerr << "  table <dm-name>" << std::endl;
     std::cerr << "  help" << std::endl;
     std::cerr << std::endl;
@@ -122,6 +115,62 @@
             }
             std::string block_device = NextArg();
             return std::make_unique<DmTargetBow>(start_sector, num_sectors, block_device);
+        } else if (target_type == "snapshot-origin") {
+            if (!HasArgs(1)) {
+                std::cerr << "Expected \"snapshot-origin\" <block_device>" << std::endl;
+                return nullptr;
+            }
+            std::string block_device = NextArg();
+            return std::make_unique<DmTargetSnapshotOrigin>(start_sector, num_sectors,
+                                                            block_device);
+        } else if (target_type == "snapshot") {
+            if (!HasArgs(4)) {
+                std::cerr
+                        << "Expected \"snapshot\" <block_device> <block_device> <mode> <chunk_size>"
+                        << std::endl;
+                return nullptr;
+            }
+            std::string base_device = NextArg();
+            std::string cow_device = NextArg();
+            std::string mode_str = NextArg();
+            std::string chunk_size_str = NextArg();
+
+            SnapshotStorageMode mode;
+            if (mode_str == "P") {
+                mode = SnapshotStorageMode::Persistent;
+            } else if (mode_str == "N") {
+                mode = SnapshotStorageMode::Transient;
+            } else {
+                std::cerr << "Unrecognized mode: " << mode_str << "\n";
+                return nullptr;
+            }
+
+            uint32_t chunk_size;
+            if (!android::base::ParseUint(chunk_size_str, &chunk_size)) {
+                std::cerr << "Chunk size must be an unsigned integer.\n";
+                return nullptr;
+            }
+            return std::make_unique<DmTargetSnapshot>(start_sector, num_sectors, base_device,
+                                                      cow_device, mode, chunk_size);
+        } else if (target_type == "snapshot-merge") {
+            if (!HasArgs(3)) {
+                std::cerr
+                        << "Expected \"snapshot-merge\" <block_device> <block_device> <chunk_size>"
+                        << std::endl;
+                return nullptr;
+            }
+            std::string base_device = NextArg();
+            std::string cow_device = NextArg();
+            std::string chunk_size_str = NextArg();
+            SnapshotStorageMode mode = SnapshotStorageMode::Merge;
+
+            uint32_t chunk_size;
+            if (!android::base::ParseUint(chunk_size_str, &chunk_size)) {
+                std::cerr << "Chunk size must be an unsigned integer.\n";
+                return nullptr;
+            }
+            return std::make_unique<DmTargetSnapshot>(start_sector, num_sectors, base_device,
+                                                      cow_device, mode, chunk_size);
         } else {
             std::cerr << "Unrecognized target type: " << target_type << std::endl;
             return nullptr;
@@ -308,7 +357,7 @@
     return 0;
 }
 
-static int TableCmdHandler(int argc, char** argv) {
+static int DumpTable(const std::string& mode, int argc, char** argv) {
     if (argc != 1) {
         std::cerr << "Invalid arguments, see \'dmctl help\'" << std::endl;
         return -EINVAL;
@@ -316,9 +365,18 @@
 
     DeviceMapper& dm = DeviceMapper::Instance();
     std::vector<DeviceMapper::TargetInfo> table;
-    if (!dm.GetTableInfo(argv[0], &table)) {
-        std::cerr << "Could not query table status of device \"" << argv[0] << "\"." << std::endl;
-        return -EINVAL;
+    if (mode == "status") {
+        if (!dm.GetTableStatus(argv[0], &table)) {
+            std::cerr << "Could not query table status of device \"" << argv[0] << "\"."
+                      << std::endl;
+            return -EINVAL;
+        }
+    } else if (mode == "table") {
+        if (!dm.GetTableInfo(argv[0], &table)) {
+            std::cerr << "Could not query table status of device \"" << argv[0] << "\"."
+                      << std::endl;
+            return -EINVAL;
+        }
     }
     std::cout << "Targets in the device-mapper table for " << argv[0] << ":" << std::endl;
     for (const auto& target : table) {
@@ -333,6 +391,14 @@
     return 0;
 }
 
+static int TableCmdHandler(int argc, char** argv) {
+    return DumpTable("table", argc, argv);
+}
+
+static int StatusCmdHandler(int argc, char** argv) {
+    return DumpTable("status", argc, argv);
+}
+
 static std::map<std::string, std::function<int(int, char**)>> cmdmap = {
         // clang-format off
         {"create", DmCreateCmdHandler},
@@ -341,6 +407,7 @@
         {"help", HelpCmdHandler},
         {"getpath", GetPathCmdHandler},
         {"table", TableCmdHandler},
+        {"status", StatusCmdHandler},
         // clang-format on
 };
 
diff --git a/healthd/healthd_mode_charger.cpp b/healthd/healthd_mode_charger.cpp
index 0e5aa4f..edf34f7 100644
--- a/healthd/healthd_mode_charger.cpp
+++ b/healthd/healthd_mode_charger.cpp
@@ -78,6 +78,7 @@
 #define UNPLUGGED_SHUTDOWN_TIME (10 * MSEC_PER_SEC)
 #define UNPLUGGED_DISPLAY_TIME (3 * MSEC_PER_SEC)
 #define MAX_BATT_LEVEL_WAIT_TIME (3 * MSEC_PER_SEC)
+#define UNPLUGGED_SHUTDOWN_TIME_PROP "ro.product.charger.unplugged_shutdown_time"
 
 #define LAST_KMSG_MAX_SZ (32 * 1024)
 
@@ -513,6 +514,7 @@
 }
 
 static void handle_power_supply_state(charger* charger, int64_t now) {
+    int timer_shutdown = UNPLUGGED_SHUTDOWN_TIME;
     if (!charger->have_battery_state) return;
 
     if (!charger->charger_connected) {
@@ -525,12 +527,14 @@
              * Reset & kick animation to show complete animation cycles
              * when charger disconnected.
              */
+            timer_shutdown =
+                    property_get_int32(UNPLUGGED_SHUTDOWN_TIME_PROP, UNPLUGGED_SHUTDOWN_TIME);
             charger->next_screen_transition = now - 1;
             reset_animation(charger->batt_anim);
             kick_animation(charger->batt_anim);
-            charger->next_pwr_check = now + UNPLUGGED_SHUTDOWN_TIME;
+            charger->next_pwr_check = now + timer_shutdown;
             LOGW("[%" PRId64 "] device unplugged: shutting down in %" PRId64 " (@ %" PRId64 ")\n",
-                 now, (int64_t)UNPLUGGED_SHUTDOWN_TIME, charger->next_pwr_check);
+                 now, (int64_t)timer_shutdown, charger->next_pwr_check);
         } else if (now >= charger->next_pwr_check) {
             LOGW("[%" PRId64 "] shutting down\n", now);
             reboot(RB_POWER_OFF);
diff --git a/init/README.md b/init/README.md
index 1b8b848..806bfa7 100644
--- a/init/README.md
+++ b/init/README.md
@@ -57,7 +57,7 @@
 The intention of these directories is:
 
    1. /system/etc/init/ is for core system items such as
-      SurfaceFlinger, MediaService, and logcatd.
+      SurfaceFlinger, MediaService, and logd.
    2. /vendor/etc/init/ is for SoC vendor items such as actions or
       daemons needed for core SoC functionality.
    3. /odm/etc/init/ is for device manufacturer items such as
@@ -72,7 +72,7 @@
 init .rc file should additionally contain any actions associated with
 its service.
 
-An example is the logcatd.rc and Android.mk files located in the
+An example is the userdebug logcatd.rc and Android.mk files located in the
 system/core/logcat directory.  The LOCAL\_INIT\_RC macro in the
 Android.mk file places logcatd.rc in /system/etc/init/ during the
 build process.  Init loads logcatd.rc during the mount\_all command and
@@ -317,7 +317,7 @@
   See the below section on debugging for how this can be used.
 
 `socket <name> <type> <perm> [ <user> [ <group> [ <seclabel> ] ] ]`
-> Create a unix domain socket named /dev/socket/_name_ and pass its fd to the
+> Create a UNIX domain socket named /dev/socket/_name_ and pass its fd to the
   launched process.  _type_ must be "dgram", "stream" or "seqpacket".  User and
   group default to 0.  'seclabel' is the SELinux security context for the
   socket.  It defaults to the service security context, as specified by
@@ -497,7 +497,11 @@
   This is included in the default init.rc.
 
 `loglevel <level>`
-> Sets the kernel log level to level. Properties are expanded within _level_.
+> Sets init's log level to the integer level, from 7 (all logging) to 0
+  (fatal logging only). The numeric values correspond to the kernel log
+  levels, but this command does not affect the kernel log level. Use the
+  `write` command to write to `/proc/sys/kernel/printk` to change that.
+  Properties are expanded within _level_.
 
 `mark_post_data`
 > Used to mark the point right after /data is mounted. Used to implement the
@@ -519,10 +523,10 @@
 > Attempt to mount the named device at the directory _dir_
   _flag_s include "ro", "rw", "remount", "noatime", ...
   _options_ include "barrier=1", "noauto\_da\_alloc", "discard", ... as
-  a comma separated string, eg: barrier=1,noauto\_da\_alloc
+  a comma separated string, e.g. barrier=1,noauto\_da\_alloc
 
 `parse_apex_configs`
-> Parses config file(s) from the mounted APEXes. Intented to be used only once
+> Parses config file(s) from the mounted APEXes. Intended to be used only once
   when apexd notifies the mount event by setting apexd.status to ready.
 
 `restart <service>`
@@ -585,7 +589,7 @@
 `symlink <target> <path>`
 > Create a symbolic link at _path_ with the value _target_
 
-`sysclktz <mins_west_of_gmt>`
+`sysclktz <minutes_west_of_gmt>`
 > Set the system clock base (0 if system clock ticks in GMT)
 
 `trigger <event>`
@@ -595,9 +599,6 @@
 `umount <path>`
 > Unmount the filesystem mounted at that path.
 
-`verity_load_state`
-> Internal implementation detail used to load dm-verity state.
-
 `verity_update_state <mount-point>`
 > Internal implementation detail used to update dm-verity state and
   set the partition._mount-point_.verified properties used by adb remount
@@ -648,7 +649,7 @@
 earlier executed trigger, or 2) place it in an Action with the same
 trigger within the same file at an earlier line.
 
-Nonetheless, the defacto order for first stage mount devices is:
+Nonetheless, the de facto order for first stage mount devices is:
 1. /init.rc is parsed then recursively each of its imports are
    parsed.
 2. The contents of /system/etc/init/ are alphabetized and parsed
@@ -695,8 +696,11 @@
 > Time after boot in ns (via the CLOCK\_BOOTTIME clock) at which the first
   stage of init started.
 
+`ro.boottime.init.first_stage`
+> How long in ns it took to run first stage.
+
 `ro.boottime.init.selinux`
-> How long it took the first stage to initialize SELinux.
+> How long in ns it took to run SELinux stage.
 
 `ro.boottime.init.cold_boot_wait`
 > How long init waited for ueventd's coldboot phase to end.
@@ -738,7 +742,7 @@
 A handy script named compare-bootcharts.py can be used to compare the
 start/end time of selected processes. The aforementioned grab-bootchart.sh
 will leave a bootchart tarball named bootchart.tgz at /tmp/android-bootchart.
-If two such barballs are preserved on the host machine under different
+If two such tarballs are preserved on the host machine under different
 directories, the script can list the timestamps differences. For example:
 
 Usage: system/core/init/compare-bootcharts.py _base-bootchart-dir_ _exp-bootchart-dir_
@@ -786,7 +790,7 @@
 This option will send SIGSTOP to a service immediately before calling exec. This gives a window
 where developers can attach a debugger, strace, etc before continuing the service with SIGCONT.
 
-This flag can also be dynamically controled via the ctl.sigstop_on and ctl.sigstop_off properties.
+This flag can also be dynamically controlled via the ctl.sigstop_on and ctl.sigstop_off properties.
 
 Below is an example of dynamically debugging logd via the above:
 
diff --git a/init/builtins.cpp b/init/builtins.cpp
index 25f324c..6ce7736 100644
--- a/init/builtins.cpp
+++ b/init/builtins.cpp
@@ -474,78 +474,6 @@
     if (false) DumpState();
 }
 
-/* handle_fstab
- *
- *  Read the given fstab file and execute func on it.
- */
-static Result<int> handle_fstab(const std::string& fstabfile, std::function<int(Fstab*)> func) {
-    /*
-     * Call fs_mgr_[u]mount_all() to [u]mount all filesystems.  We fork(2) and
-     * do the call in the child to provide protection to the main init
-     * process if anything goes wrong (crash or memory leak), and wait for
-     * the child to finish in the parent.
-     */
-    pid_t pid = fork();
-    if (pid > 0) {
-        /* Parent.  Wait for the child to return */
-        int status;
-        int wp_ret = TEMP_FAILURE_RETRY(waitpid(pid, &status, 0));
-        if (wp_ret == -1) {
-            // Unexpected error code. We will continue anyway.
-            PLOG(WARNING) << "waitpid failed";
-        }
-
-        if (WIFEXITED(status)) {
-            return WEXITSTATUS(status);
-        } else {
-            return Error() << "child aborted";
-        }
-    } else if (pid == 0) {
-        /* child, call fs_mgr_[u]mount_all() */
-
-        // So we can always see what fs_mgr_[u]mount_all() does.
-        // Only needed if someone explicitly changes the default log level in their init.rc.
-        android::base::ScopedLogSeverity info(android::base::INFO);
-
-        Fstab fstab;
-        ReadFstabFromFile(fstabfile, &fstab);
-
-        int child_ret = func(&fstab);
-
-        _exit(child_ret);
-    } else {
-        return Error() << "fork() failed";
-    }
-}
-
-/* mount_fstab
- *
- *  Call fs_mgr_mount_all() to mount the given fstab
- */
-static Result<int> mount_fstab(const std::string& fstabfile, int mount_mode) {
-    return handle_fstab(fstabfile, [mount_mode](Fstab* fstab) {
-        int ret = fs_mgr_mount_all(fstab, mount_mode);
-        if (ret == -1) {
-            PLOG(ERROR) << "fs_mgr_mount_all returned an error";
-        }
-        return ret;
-    });
-}
-
-/* umount_fstab
- *
- *  Call fs_mgr_umount_all() to umount the given fstab
- */
-static Result<int> umount_fstab(const std::string& fstabfile) {
-    return handle_fstab(fstabfile, [](Fstab* fstab) {
-        int ret = fs_mgr_umount_all(fstab);
-        if (ret != 0) {
-            PLOG(ERROR) << "fs_mgr_umount_all returned " << ret;
-        }
-        return ret;
-    });
-}
-
 /* Queue event based on fs_mgr return code.
  *
  * code: return code of fs_mgr_mount_all
@@ -632,7 +560,7 @@
     bool import_rc = true;
     bool queue_event = true;
     int mount_mode = MOUNT_MODE_DEFAULT;
-    const auto& fstabfile = args[1];
+    const auto& fstab_file = args[1];
     std::size_t path_arg_end = args.size();
     const char* prop_post_fix = "default";
 
@@ -652,10 +580,12 @@
 
     std::string prop_name = "ro.boottime.init.mount_all."s + prop_post_fix;
     android::base::Timer t;
-    auto mount_fstab_return_code = mount_fstab(fstabfile, mount_mode);
-    if (!mount_fstab_return_code) {
-        return Error() << "mount_fstab() failed " << mount_fstab_return_code.error();
+
+    Fstab fstab;
+    if (!ReadFstabFromFile(fstab_file, &fstab)) {
+        return Error() << "Could not read fstab";
     }
+    auto mount_fstab_return_code = fs_mgr_mount_all(&fstab, mount_mode);
     property_set(prop_name, std::to_string(t.duration().count()));
 
     if (import_rc) {
@@ -666,7 +596,7 @@
     if (queue_event) {
         /* queue_fs_event will queue event based on mount_fstab return code
          * and return processed return code*/
-        auto queue_fs_result = queue_fs_event(*mount_fstab_return_code);
+        auto queue_fs_result = queue_fs_event(mount_fstab_return_code);
         if (!queue_fs_result) {
             return Error() << "queue_fs_event() failed: " << queue_fs_result.error();
         }
@@ -677,9 +607,13 @@
 
 /* umount_all <fstab> */
 static Result<Success> do_umount_all(const BuiltinArguments& args) {
-    auto umount_fstab_return_code = umount_fstab(args[1]);
-    if (!umount_fstab_return_code) {
-        return Error() << "umount_fstab() failed " << umount_fstab_return_code.error();
+    Fstab fstab;
+    if (!ReadFstabFromFile(args[1], &fstab)) {
+        return Error() << "Could not read fstab";
+    }
+
+    if (auto result = fs_mgr_umount_all(&fstab); result != 0) {
+        return Error() << "umount_fstab() failed " << result;
     }
     return Success();
 }
@@ -796,17 +730,6 @@
     return Success();
 }
 
-static Result<Success> do_verity_load_state(const BuiltinArguments& args) {
-    int mode = -1;
-    bool loaded = fs_mgr_load_verity_state(&mode);
-    if (loaded && mode != VERITY_MODE_DEFAULT) {
-        ActionManager::GetInstance().QueueEventTrigger("verity-logging");
-    }
-    if (!loaded) return Error() << "Could not load verity state";
-
-    return Success();
-}
-
 static Result<Success> do_verity_update_state(const BuiltinArguments& args) {
     int mode;
     if (!fs_mgr_load_verity_state(&mode)) {
@@ -1248,7 +1171,6 @@
         {"symlink",                 {2,     2,    {true,   do_symlink}}},
         {"sysclktz",                {1,     1,    {false,  do_sysclktz}}},
         {"trigger",                 {1,     1,    {false,  do_trigger}}},
-        {"verity_load_state",       {0,     0,    {false,  do_verity_load_state}}},
         {"verity_update_state",     {0,     0,    {false,  do_verity_update_state}}},
         {"wait",                    {1,     2,    {true,   do_wait}}},
         {"wait_for_prop",           {2,     2,    {false,  do_wait_for_prop}}},
diff --git a/init/first_stage_init.cpp b/init/first_stage_init.cpp
index 8b95e38..7dd3ad4 100644
--- a/init/first_stage_init.cpp
+++ b/init/first_stage_init.cpp
@@ -235,9 +235,8 @@
 
     SetInitAvbVersionInRecovery();
 
-    static constexpr uint32_t kNanosecondsPerMillisecond = 1e6;
-    uint64_t start_ms = start_time.time_since_epoch().count() / kNanosecondsPerMillisecond;
-    setenv("INIT_STARTED_AT", std::to_string(start_ms).c_str(), 1);
+    setenv(kEnvFirstStageStartedAt, std::to_string(start_time.time_since_epoch().count()).c_str(),
+           1);
 
     const char* path = "/system/bin/init";
     const char* args[] = {path, "selinux_setup", nullptr};
diff --git a/init/first_stage_init.h b/init/first_stage_init.h
index 0476e44..7de816f 100644
--- a/init/first_stage_init.h
+++ b/init/first_stage_init.h
@@ -21,5 +21,7 @@
 
 int FirstStageMain(int argc, char** argv);
 
+static constexpr char kEnvFirstStageStartedAt[] = "FIRST_STAGE_STARTED_AT";
+
 }  // namespace init
 }  // namespace android
diff --git a/init/first_stage_mount.cpp b/init/first_stage_mount.cpp
index 3e76556..1a5ed28 100644
--- a/init/first_stage_mount.cpp
+++ b/init/first_stage_mount.cpp
@@ -276,14 +276,12 @@
 // required_devices_partition_names_. Found partitions will then be removed from it
 // for the subsequent member function to check which devices are NOT created.
 bool FirstStageMount::InitRequiredDevices() {
-    if (required_devices_partition_names_.empty()) {
-        return true;
+    if (!InitDeviceMapper()) {
+        return false;
     }
 
-    if (IsDmLinearEnabled() || need_dm_verity_) {
-        if (!InitDeviceMapper()) {
-            return false;
-        }
+    if (required_devices_partition_names_.empty()) {
+        return true;
     }
 
     auto uevent_callback = [this](const Uevent& uevent) { return UeventCallback(uevent); };
@@ -604,12 +602,6 @@
         return;
     }
 
-    // Device-mapper might not be ready if the device doesn't use DAP or verity
-    // (for example, hikey).
-    if (access("/dev/device-mapper", F_OK) && !InitDeviceMapper()) {
-        return;
-    }
-
     // Find the name of the super partition for the GSI. It will either be
     // "userdata", or a block device such as an sdcard. There are no by-name
     // partitions other than userdata that we support installing GSIs to.
@@ -644,7 +636,6 @@
 }
 
 bool FirstStageMountVBootV1::GetDmVerityDevices() {
-    std::string verity_loc_device;
     need_dm_verity_ = false;
 
     for (const auto& fstab_entry : fstab_) {
@@ -657,21 +648,9 @@
         if (fstab_entry.fs_mgr_flags.verify) {
             need_dm_verity_ = true;
         }
-        // Checks if verity metadata is on a separate partition. Note that it is
-        // not partition specific, so there must be only one additional partition
-        // that carries verity state.
-        if (!fstab_entry.verity_loc.empty()) {
-            if (verity_loc_device.empty()) {
-                verity_loc_device = fstab_entry.verity_loc;
-            } else if (verity_loc_device != fstab_entry.verity_loc) {
-                LOG(ERROR) << "More than one verity_loc found: " << verity_loc_device << ", "
-                           << fstab_entry.verity_loc;
-                return false;
-            }
-        }
     }
 
-    // Includes the partition names of fstab records and verity_loc_device (if any).
+    // Includes the partition names of fstab records.
     // Notes that fstab_rec->blk_device has A/B suffix updated by fs_mgr when A/B is used.
     for (const auto& fstab_entry : fstab_) {
         if (!fstab_entry.fs_mgr_flags.logical) {
@@ -679,10 +658,6 @@
         }
     }
 
-    if (!verity_loc_device.empty()) {
-        required_devices_partition_names_.emplace(basename(verity_loc_device.c_str()));
-    }
-
     return true;
 }
 
diff --git a/init/init.cpp b/init/init.cpp
index c79e459..1f3c2fc 100644
--- a/init/init.cpp
+++ b/init/init.cpp
@@ -35,6 +35,7 @@
 #include <android-base/chrono_utils.h>
 #include <android-base/file.h>
 #include <android-base/logging.h>
+#include <android-base/parseint.h>
 #include <android-base/properties.h>
 #include <android-base/stringprintf.h>
 #include <android-base/strings.h>
@@ -55,6 +56,7 @@
 #include "action_parser.h"
 #include "boringssl_self_test.h"
 #include "epoll.h"
+#include "first_stage_init.h"
 #include "first_stage_mount.h"
 #include "import_parser.h"
 #include "keychords.h"
@@ -627,11 +629,38 @@
     }
 }
 
+static void RecordStageBoottimes(const boot_clock::time_point& second_stage_start_time) {
+    int64_t first_stage_start_time_ns = -1;
+    if (auto first_stage_start_time_str = getenv(kEnvFirstStageStartedAt);
+        first_stage_start_time_str) {
+        property_set("ro.boottime.init", first_stage_start_time_str);
+        android::base::ParseInt(first_stage_start_time_str, &first_stage_start_time_ns);
+    }
+    unsetenv(kEnvFirstStageStartedAt);
+
+    int64_t selinux_start_time_ns = -1;
+    if (auto selinux_start_time_str = getenv(kEnvSelinuxStartedAt); selinux_start_time_str) {
+        android::base::ParseInt(selinux_start_time_str, &selinux_start_time_ns);
+    }
+    unsetenv(kEnvSelinuxStartedAt);
+
+    if (selinux_start_time_ns == -1) return;
+    if (first_stage_start_time_ns == -1) return;
+
+    property_set("ro.boottime.init.first_stage",
+                 std::to_string(selinux_start_time_ns - first_stage_start_time_ns));
+    property_set("ro.boottime.init.selinux",
+                 std::to_string(second_stage_start_time.time_since_epoch().count() -
+                                selinux_start_time_ns));
+}
+
 int SecondStageMain(int argc, char** argv) {
     if (REBOOT_BOOTLOADER_ON_PANIC) {
         InstallRebootSignalHandlers();
     }
 
+    boot_clock::time_point start_time = boot_clock::now();
+
     // We need to set up stdin/stdout/stderr again now that we're running in init's context.
     InitKernelLogging(argv, InitAborter);
     LOG(INFO) << "init second stage started!";
@@ -663,9 +692,8 @@
     // used by init as well as the current required properties.
     export_kernel_boot_props();
 
-    // Make the time that init started available for bootstat to log.
-    property_set("ro.boottime.init", getenv("INIT_STARTED_AT"));
-    property_set("ro.boottime.init.selinux", getenv("INIT_SELINUX_TOOK"));
+    // Make the time that init stages started available for bootstat to log.
+    RecordStageBoottimes(start_time);
 
     // Set libavb version for Framework-only OTA match in Treble build.
     const char* avb_version = getenv("INIT_AVB_VERSION");
@@ -678,8 +706,6 @@
     }
 
     // Clean up our environment.
-    unsetenv("INIT_STARTED_AT");
-    unsetenv("INIT_SELINUX_TOOK");
     unsetenv("INIT_AVB_VERSION");
     unsetenv("INIT_FORCE_DEBUGGABLE");
 
diff --git a/init/property_service.cpp b/init/property_service.cpp
index bca73c9..a1e9551 100644
--- a/init/property_service.cpp
+++ b/init/property_service.cpp
@@ -41,7 +41,9 @@
 
 #include <map>
 #include <memory>
+#include <mutex>
 #include <queue>
+#include <thread>
 #include <vector>
 
 #include <android-base/chrono_utils.h>
@@ -83,6 +85,8 @@
 namespace android {
 namespace init {
 
+static constexpr const char kRestoreconProperty[] = "selinux.restorecon_recursive";
+
 static bool persistent_properties_loaded = false;
 
 static int property_set_fd = -1;
@@ -100,7 +104,24 @@
     const char* name;
 };
 
+static int PropertyAuditCallback(void* data, security_class_t /*cls*/, char* buf, size_t len) {
+    auto* d = reinterpret_cast<PropertyAuditData*>(data);
+
+    if (!d || !d->name || !d->cr) {
+        LOG(ERROR) << "AuditCallback invoked with null data arguments!";
+        return 0;
+    }
+
+    snprintf(buf, len, "property=%s pid=%d uid=%d gid=%d", d->name, d->cr->pid, d->cr->uid,
+             d->cr->gid);
+    return 0;
+}
+
 void property_init() {
+    selinux_callback cb;
+    cb.func_audit = PropertyAuditCallback;
+    selinux_set_callback(SELINUX_CB_AUDIT, cb);
+
     mkdir("/dev/__properties__", S_IRWXU | S_IXGRP | S_IXOTH);
     CreateSerializedPropertyInfo();
     if (__system_property_area_init()) {
@@ -187,88 +208,51 @@
     return PROP_SUCCESS;
 }
 
-typedef int (*PropertyAsyncFunc)(const std::string&, const std::string&);
+class AsyncRestorecon {
+  public:
+    void TriggerRestorecon(const std::string& path) {
+        auto guard = std::lock_guard{mutex_};
+        paths_.emplace(path);
 
-struct PropertyChildInfo {
-    pid_t pid;
-    PropertyAsyncFunc func;
-    std::string name;
-    std::string value;
+        if (!thread_started_) {
+            thread_started_ = true;
+            std::thread{&AsyncRestorecon::ThreadFunction, this}.detach();
+        }
+    }
+
+  private:
+    void ThreadFunction() {
+        auto lock = std::unique_lock{mutex_};
+
+        while (!paths_.empty()) {
+            auto path = paths_.front();
+            paths_.pop();
+
+            lock.unlock();
+            if (selinux_android_restorecon(path.c_str(), SELINUX_ANDROID_RESTORECON_RECURSE) != 0) {
+                LOG(ERROR) << "Asynchronous restorecon of '" << path << "' failed'";
+            }
+            android::base::SetProperty(kRestoreconProperty, path);
+            lock.lock();
+        }
+
+        thread_started_ = false;
+    }
+
+    std::mutex mutex_;
+    std::queue<std::string> paths_;
+    bool thread_started_ = false;
 };
 
-static std::queue<PropertyChildInfo> property_children;
-
-static void PropertyChildLaunch() {
-    auto& info = property_children.front();
-    pid_t pid = fork();
-    if (pid < 0) {
-        LOG(ERROR) << "Failed to fork for property_set_async";
-        while (!property_children.empty()) {
-            property_children.pop();
-        }
-        return;
-    }
-    if (pid != 0) {
-        info.pid = pid;
-    } else {
-        if (info.func(info.name, info.value) != 0) {
-            LOG(ERROR) << "property_set_async(\"" << info.name << "\", \"" << info.value
-                       << "\") failed";
-        }
-        _exit(0);
-    }
-}
-
-bool PropertyChildReap(pid_t pid) {
-    if (property_children.empty()) {
-        return false;
-    }
-    auto& info = property_children.front();
-    if (info.pid != pid) {
-        return false;
-    }
-    std::string error;
-    if (PropertySet(info.name, info.value, &error) != PROP_SUCCESS) {
-        LOG(ERROR) << "Failed to set async property " << info.name << " to " << info.value << ": "
-                   << error;
-    }
-    property_children.pop();
-    if (!property_children.empty()) {
-        PropertyChildLaunch();
-    }
-    return true;
-}
-
-static uint32_t PropertySetAsync(const std::string& name, const std::string& value,
-                                 PropertyAsyncFunc func, std::string* error) {
-    if (value.empty()) {
-        return PropertySet(name, value, error);
-    }
-
-    PropertyChildInfo info;
-    info.func = func;
-    info.name = name;
-    info.value = value;
-    property_children.push(info);
-    if (property_children.size() == 1) {
-        PropertyChildLaunch();
-    }
-    return PROP_SUCCESS;
-}
-
-static int RestoreconRecursiveAsync(const std::string& name, const std::string& value) {
-    return selinux_android_restorecon(value.c_str(), SELINUX_ANDROID_RESTORECON_RECURSE);
-}
-
 uint32_t InitPropertySet(const std::string& name, const std::string& value) {
     if (StartsWith(name, "ctl.")) {
         LOG(ERROR) << "InitPropertySet: Do not set ctl. properties from init; call the Service "
                       "functions directly";
         return PROP_ERROR_INVALID_NAME;
     }
-    if (name == "selinux.restorecon_recursive") {
-        LOG(ERROR) << "InitPropertySet: Do not set selinux.restorecon_recursive from init; use the "
-                      "restorecon builtin directly";
+    if (name == kRestoreconProperty) {
+        LOG(ERROR) << "InitPropertySet: Do not set '" << kRestoreconProperty
+                   << "' from init; use the restorecon builtin directly";
         return PROP_ERROR_INVALID_NAME;
     }
 
@@ -329,18 +313,20 @@
         return result == sizeof(value);
     }
 
+    bool GetSourceContext(std::string* source_context) const {
+        char* c_source_context = nullptr;
+        if (getpeercon(socket_, &c_source_context) != 0) {
+            return false;
+        }
+        *source_context = c_source_context;
+        freecon(c_source_context);
+        return true;
+    }
+
     int socket() { return socket_; }
 
     const ucred& cred() { return cred_; }
 
-    std::string source_context() const {
-        char* source_context = nullptr;
-        getpeercon(socket_, &source_context);
-        std::string result = source_context;
-        freecon(source_context);
-        return result;
-    }
-
   private:
     bool PollIn(uint32_t* timeout_ms) {
         struct pollfd ufds[1];
@@ -506,8 +492,14 @@
                   << process_log_string;
     }
 
-    if (name == "selinux.restorecon_recursive") {
-        return PropertySetAsync(name, value, RestoreconRecursiveAsync, error);
+    // If a process other than init is writing a non-empty value, it means that process is
+    // requesting that init performs a restorecon operation on the path specified by 'value'.
+    // We use a thread to do this restorecon operation to prevent holding up init, as it may take
+    // a long time to complete.
+    if (name == kRestoreconProperty && cr.pid != 1 && !value.empty()) {
+        static AsyncRestorecon async_restorecon;
+        async_restorecon.TriggerRestorecon(value);
+        return PROP_SUCCESS;
     }
 
     return PropertySet(name, value, error);
@@ -553,14 +545,18 @@
         prop_name[PROP_NAME_MAX-1] = 0;
         prop_value[PROP_VALUE_MAX-1] = 0;
 
+        std::string source_context;
+        if (!socket.GetSourceContext(&source_context)) {
+            PLOG(ERROR) << "Unable to set property '" << prop_name << "': getpeercon() failed";
+            return;
+        }
+
         const auto& cr = socket.cred();
         std::string error;
-        uint32_t result =
-            HandlePropertySet(prop_name, prop_value, socket.source_context(), cr, &error);
+        uint32_t result = HandlePropertySet(prop_name, prop_value, source_context, cr, &error);
         if (result != PROP_SUCCESS) {
-            LOG(ERROR) << "Unable to set property '" << prop_name << "' to '" << prop_value
-                       << "' from uid:" << cr.uid << " gid:" << cr.gid << " pid:" << cr.pid << ": "
-                       << error;
+            LOG(ERROR) << "Unable to set property '" << prop_name << "' from uid:" << cr.uid
+                       << " gid:" << cr.gid << " pid:" << cr.pid << ": " << error;
         }
 
         break;
@@ -576,13 +572,19 @@
           return;
         }
 
+        std::string source_context;
+        if (!socket.GetSourceContext(&source_context)) {
+            PLOG(ERROR) << "Unable to set property '" << name << "': getpeercon() failed";
+            socket.SendUint32(PROP_ERROR_PERMISSION_DENIED);
+            return;
+        }
+
         const auto& cr = socket.cred();
         std::string error;
-        uint32_t result = HandlePropertySet(name, value, socket.source_context(), cr, &error);
+        uint32_t result = HandlePropertySet(name, value, source_context, cr, &error);
         if (result != PROP_SUCCESS) {
-            LOG(ERROR) << "Unable to set property '" << name << "' to '" << value
-                       << "' from uid:" << cr.uid << " gid:" << cr.gid << " pid:" << cr.pid << ": "
-                       << error;
+            LOG(ERROR) << "Unable to set property '" << name << "' from uid:" << cr.uid
+                       << " gid:" << cr.gid << " pid:" << cr.pid << ": " << error;
         }
         socket.SendUint32(result);
         break;
@@ -663,7 +665,7 @@
             }
 
             if (StartsWith(key, "ctl.") || key == "sys.powerctl"s ||
-                key == "selinux.restorecon_recursive"s) {
+                std::string{key} == kRestoreconProperty) {
                 LOG(ERROR) << "Ignoring disallowed property '" << key
                            << "' with special meaning in prop file '" << filename << "'";
                 continue;
@@ -908,19 +910,6 @@
     update_sys_usb_config();
 }
 
-static int SelinuxAuditCallback(void* data, security_class_t /*cls*/, char* buf, size_t len) {
-    auto* d = reinterpret_cast<PropertyAuditData*>(data);
-
-    if (!d || !d->name || !d->cr) {
-        LOG(ERROR) << "AuditCallback invoked with null data arguments!";
-        return 0;
-    }
-
-    snprintf(buf, len, "property=%s pid=%d uid=%d gid=%d", d->name, d->cr->pid, d->cr->uid,
-             d->cr->gid);
-    return 0;
-}
-
 bool LoadPropertyInfoFromFile(const std::string& filename,
                               std::vector<PropertyInfoEntry>* property_infos) {
     auto file_contents = std::string();
@@ -991,10 +980,6 @@
 }
 
 void StartPropertyService(Epoll* epoll) {
-    selinux_callback cb;
-    cb.func_audit = SelinuxAuditCallback;
-    selinux_set_callback(SELINUX_CB_AUDIT, cb);
-
     property_set("ro.property_service.version", "2");
 
     property_set_fd = CreateSocket(PROP_SERVICE_NAME, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
diff --git a/init/property_service.h b/init/property_service.h
index 85e7bc0..7f9f844 100644
--- a/init/property_service.h
+++ b/init/property_service.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _INIT_PROPERTY_H
-#define _INIT_PROPERTY_H
+#pragma once
 
 #include <sys/socket.h>
 
@@ -33,15 +32,10 @@
 uint32_t HandlePropertySet(const std::string& name, const std::string& value,
                            const std::string& source_context, const ucred& cr, std::string* error);
 
-extern bool PropertyChildReap(pid_t pid);
-
-void property_init(void);
-void property_load_boot_defaults(bool);
-void load_persist_props(void);
-void load_system_props(void);
+void property_init();
+void property_load_boot_defaults(bool load_debug_prop);
+void load_persist_props();
 void StartPropertyService(Epoll* epoll);
 
 }  // namespace init
 }  // namespace android
-
-#endif  /* _INIT_PROPERTY_H */
diff --git a/init/reboot.cpp b/init/reboot.cpp
index 5b90969..0966b6c 100644
--- a/init/reboot.cpp
+++ b/init/reboot.cpp
@@ -19,13 +19,14 @@
 #include <dirent.h>
 #include <fcntl.h>
 #include <linux/fs.h>
-#include <mntent.h>
 #include <linux/loop.h>
+#include <mntent.h>
+#include <semaphore.h>
 #include <sys/cdefs.h>
 #include <sys/ioctl.h>
 #include <sys/mount.h>
-#include <sys/swap.h>
 #include <sys/stat.h>
+#include <sys/swap.h>
 #include <sys/syscall.h>
 #include <sys/types.h>
 #include <sys/wait.h>
@@ -57,11 +58,14 @@
 #include "service.h"
 #include "sigchld_handler.h"
 
+#define PROC_SYSRQ "/proc/sysrq-trigger"
+
 using android::base::GetBoolProperty;
 using android::base::Split;
 using android::base::StringPrintf;
 using android::base::Timer;
 using android::base::unique_fd;
+using android::base::WriteStringToFile;
 
 namespace android {
 namespace init {
@@ -207,8 +211,8 @@
     }
     FindPartitionsToUmount(nullptr, nullptr, true);
     // dump current CPU stack traces and uninterruptible tasks
-    android::base::WriteStringToFile("l", "/proc/sysrq-trigger");
-    android::base::WriteStringToFile("w", "/proc/sysrq-trigger");
+    WriteStringToFile("l", PROC_SYSRQ);
+    WriteStringToFile("w", PROC_SYSRQ);
 }
 
 static UmountStat UmountPartitions(std::chrono::milliseconds timeout) {
@@ -248,7 +252,91 @@
     }
 }
 
-static void KillAllProcesses() { android::base::WriteStringToFile("i", "/proc/sysrq-trigger"); }
+static void KillAllProcesses() {
+    WriteStringToFile("i", PROC_SYSRQ);
+}
+
+// Create reboot/shutdwon monitor thread
+void RebootMonitorThread(unsigned int cmd, const std::string& rebootTarget, sem_t* reboot_semaphore,
+                         std::chrono::milliseconds shutdown_timeout, bool* reboot_monitor_run) {
+    unsigned int remaining_shutdown_time = 0;
+
+    // 30 seconds more than the timeout passed to the thread as there is a final Umount pass
+    // after the timeout is reached.
+    constexpr unsigned int shutdown_watchdog_timeout_default = 30;
+    auto shutdown_watchdog_timeout = android::base::GetUintProperty(
+            "ro.build.shutdown.watchdog.timeout", shutdown_watchdog_timeout_default);
+    remaining_shutdown_time = shutdown_watchdog_timeout + shutdown_timeout.count() / 1000;
+
+    while (*reboot_monitor_run == true) {
+        if (TEMP_FAILURE_RETRY(sem_wait(reboot_semaphore)) == -1) {
+            LOG(ERROR) << "sem_wait failed and exit RebootMonitorThread()";
+            return;
+        }
+
+        timespec shutdown_timeout_timespec;
+        if (clock_gettime(CLOCK_MONOTONIC, &shutdown_timeout_timespec) == -1) {
+            LOG(ERROR) << "clock_gettime() fail! exit RebootMonitorThread()";
+            return;
+        }
+
+        // If there are some remaining shutdown time left from previous round, we use
+        // remaining time here.
+        shutdown_timeout_timespec.tv_sec += remaining_shutdown_time;
+
+        LOG(INFO) << "shutdown_timeout_timespec.tv_sec: " << shutdown_timeout_timespec.tv_sec;
+
+        int sem_return = 0;
+        while ((sem_return = sem_timedwait_monotonic_np(reboot_semaphore,
+                                                        &shutdown_timeout_timespec)) == -1 &&
+               errno == EINTR) {
+        }
+
+        if (sem_return == -1) {
+            LOG(ERROR) << "Reboot thread timed out";
+
+            if (android::base::GetBoolProperty("ro.debuggable", false) == true) {
+                LOG(INFO) << "Try to dump init process call trace:";
+                const char* vdc_argv[] = {"/system/bin/debuggerd", "-b", "1"};
+                int status;
+                android_fork_execvp_ext(arraysize(vdc_argv), (char**)vdc_argv, &status, true,
+                                        LOG_KLOG, true, nullptr, nullptr, 0);
+
+                LOG(INFO) << "Show stack for all active CPU:";
+                WriteStringToFile("l", PROC_SYSRQ);
+
+                LOG(INFO) << "Show tasks that are in disk sleep(uninterruptable sleep), which are "
+                             "like "
+                             "blocked in mutex or hardware register access:";
+                WriteStringToFile("w", PROC_SYSRQ);
+            }
+
+            // In shutdown case,notify kernel to sync and umount fs to read-only before shutdown.
+            if (cmd == ANDROID_RB_POWEROFF || cmd == ANDROID_RB_THERMOFF) {
+                WriteStringToFile("s", PROC_SYSRQ);
+
+                WriteStringToFile("u", PROC_SYSRQ);
+
+                RebootSystem(cmd, rebootTarget);
+            }
+
+            LOG(ERROR) << "Trigger crash at last!";
+            WriteStringToFile("c", PROC_SYSRQ);
+        } else {
+            timespec current_time_timespec;
+
+            if (clock_gettime(CLOCK_MONOTONIC, &current_time_timespec) == -1) {
+                LOG(ERROR) << "clock_gettime() fail! exit RebootMonitorThread()";
+                return;
+            }
+
+            remaining_shutdown_time =
+                    shutdown_timeout_timespec.tv_sec - current_time_timespec.tv_sec;
+
+            LOG(INFO) << "remaining_shutdown_time: " << remaining_shutdown_time;
+        }
+    }
+}
 
 /* Try umounting all emulated file systems R/W block device cfile systems.
  * This will just try umount and give it up if it fails.
@@ -259,7 +347,8 @@
  *
  * return true when umount was successful. false when timed out.
  */
-static UmountStat TryUmountAndFsck(bool runFsck, std::chrono::milliseconds timeout) {
+static UmountStat TryUmountAndFsck(unsigned int cmd, const std::string& rebootTarget, bool runFsck,
+                                   std::chrono::milliseconds timeout, sem_t* reboot_semaphore) {
     Timer t;
     std::vector<MountEntry> block_devices;
     std::vector<MountEntry> emulated_devices;
@@ -279,11 +368,17 @@
     }
 
     if (stat == UMOUNT_STAT_SUCCESS && runFsck) {
+        LOG(INFO) << "Pause reboot monitor thread before fsck";
+        sem_post(reboot_semaphore);
+
         // fsck part is excluded from timeout check. It only runs for user initiated shutdown
         // and should not affect reboot time.
         for (auto& entry : block_devices) {
             entry.DoFsck();
         }
+
+        LOG(INFO) << "Resume reboot monitor thread after fsck";
+        sem_post(reboot_semaphore);
     }
     return stat;
 }
@@ -311,7 +406,7 @@
     }
     LOG(INFO) << "swapoff() took " << swap_timer;;
 
-    if (!android::base::WriteStringToFile("1", ZRAM_RESET)) {
+    if (!WriteStringToFile("1", ZRAM_RESET)) {
         LOG(ERROR) << "zram_backing_dev: reset (" << backing_dev << ")" << " failed";
         return;
     }
@@ -369,6 +464,23 @@
     }
     LOG(INFO) << "Shutdown timeout: " << shutdown_timeout.count() << " ms";
 
+    sem_t reboot_semaphore;
+    if (sem_init(&reboot_semaphore, false, 0) == -1) {
+        // These should never fail, but if they do, skip the graceful reboot and reboot immediately.
+        LOG(ERROR) << "sem_init() fail and RebootSystem() return!";
+        RebootSystem(cmd, rebootTarget);
+    }
+
+    // Start a thread to monitor init shutdown process
+    LOG(INFO) << "Create reboot monitor thread.";
+    bool reboot_monitor_run = true;
+    std::thread reboot_monitor_thread(&RebootMonitorThread, cmd, rebootTarget, &reboot_semaphore,
+                                      shutdown_timeout, &reboot_monitor_run);
+    reboot_monitor_thread.detach();
+
+    // Start reboot monitor thread
+    sem_post(&reboot_semaphore);
+
     // keep debugging tools until non critical ones are all gone.
     const std::set<std::string> kill_after_apps{"tombstoned", "logd", "adbd"};
     // watchdogd is a vendor specific component but should be alive to complete shutdown safely.
@@ -497,7 +609,8 @@
     // 5. drop caches and disable zram backing device, if exist
     KillZramBackingDevice();
 
-    UmountStat stat = TryUmountAndFsck(runFsck, shutdown_timeout - t.duration());
+    UmountStat stat = TryUmountAndFsck(cmd, rebootTarget, runFsck, shutdown_timeout - t.duration(),
+                                       &reboot_semaphore);
     // Follow what linux shutdown is doing: one more sync with little bit delay
     {
         Timer sync_timer;
@@ -507,6 +620,11 @@
     }
     if (!is_thermal_shutdown) std::this_thread::sleep_for(100ms);
     LogShutdownTime(stat, &t);
+
+    // Send signal to terminate reboot monitor thread.
+    reboot_monitor_run = false;
+    sem_post(&reboot_semaphore);
+
     // Reboot regardless of umount status. If umount fails, fsck after reboot will fix it.
     RebootSystem(cmd, rebootTarget);
     abort();
diff --git a/init/selinux.cpp b/init/selinux.cpp
index 132fc13..8a63363 100644
--- a/init/selinux.cpp
+++ b/init/selinux.cpp
@@ -331,6 +331,12 @@
     }
     std::string plat_mapping_file("/system/etc/selinux/mapping/" + vend_plat_vers + ".cil");
 
+    std::string plat_compat_cil_file("/system/etc/selinux/mapping/" + vend_plat_vers +
+                                     ".compat.cil");
+    if (access(plat_compat_cil_file.c_str(), F_OK) == -1) {
+        plat_compat_cil_file.clear();
+    }
+
     std::string product_policy_cil_file("/product/etc/selinux/product_sepolicy.cil");
     if (access(product_policy_cil_file.c_str(), F_OK) == -1) {
         product_policy_cil_file.clear();
@@ -376,6 +382,9 @@
     };
     // clang-format on
 
+    if (!plat_compat_cil_file.empty()) {
+        compile_args.push_back(plat_compat_cil_file.c_str());
+    }
     if (!product_policy_cil_file.empty()) {
         compile_args.push_back(product_policy_cil_file.c_str());
     }
@@ -422,8 +431,6 @@
 }
 
 void SelinuxInitialize() {
-    Timer t;
-
     LOG(INFO) << "Loading SELinux policy";
     if (!LoadPolicy()) {
         LOG(FATAL) << "Unable to load SELinux policy";
@@ -440,9 +447,6 @@
     if (auto result = WriteFile("/sys/fs/selinux/checkreqprot", "0"); !result) {
         LOG(FATAL) << "Unable to write to /sys/fs/selinux/checkreqprot: " << result.error();
     }
-
-    // init's first stage can't set properties, so pass the time to the second stage.
-    setenv("INIT_SELINUX_TOOK", std::to_string(t.duration().count()).c_str(), 1);
 }
 
 }  // namespace
@@ -526,6 +530,8 @@
         InstallRebootSignalHandlers();
     }
 
+    boot_clock::time_point start_time = boot_clock::now();
+
     // Set up SELinux, loading the SELinux policy.
     SelinuxSetupKernelLogging();
     SelinuxInitialize();
@@ -538,6 +544,8 @@
         PLOG(FATAL) << "restorecon failed of /system/bin/init failed";
     }
 
+    setenv(kEnvSelinuxStartedAt, std::to_string(start_time.time_since_epoch().count()).c_str(), 1);
+
     const char* path = "/system/bin/init";
     const char* args[] = {path, "second_stage", nullptr};
     execv(path, const_cast<char**>(args));
diff --git a/init/selinux.h b/init/selinux.h
index 3aa9406..c7d6647 100644
--- a/init/selinux.h
+++ b/init/selinux.h
@@ -35,6 +35,8 @@
                                        const std::vector<std::string>& aliases, int type,
                                        std::string* result);
 
+static constexpr char kEnvSelinuxStartedAt[] = "SELINUX_STARTED_AT";
+
 }  // namespace init
 }  // namespace android
 
diff --git a/init/sigchld_handler.cpp b/init/sigchld_handler.cpp
index 0b03324..987b2f9 100644
--- a/init/sigchld_handler.cpp
+++ b/init/sigchld_handler.cpp
@@ -29,7 +29,6 @@
 #include <android-base/stringprintf.h>
 
 #include "init.h"
-#include "property_service.h"
 #include "service.h"
 
 using android::base::StringPrintf;
@@ -61,9 +60,7 @@
     std::string wait_string;
     Service* service = nullptr;
 
-    if (PropertyChildReap(pid)) {
-        name = "Async property child";
-    } else if (SubcontextChildReap(pid)) {
+    if (SubcontextChildReap(pid)) {
         name = "Subcontext";
     } else {
         service = ServiceList::GetInstance().FindService(pid, &Service::pid);
diff --git a/libbacktrace/Android.bp b/libbacktrace/Android.bp
index 7f9a18a..e171155 100644
--- a/libbacktrace/Android.bp
+++ b/libbacktrace/Android.bp
@@ -42,6 +42,7 @@
     name: "libbacktrace_headers",
     vendor_available: true,
     recovery_available: true,
+    native_bridge_supported: true,
     export_include_dirs: ["include"],
 }
 
diff --git a/libcutils/Android.bp b/libcutils/Android.bp
index 619bc56..319a73a 100644
--- a/libcutils/Android.bp
+++ b/libcutils/Android.bp
@@ -34,6 +34,7 @@
     vendor_available: true,
     recovery_available: true,
     host_supported: true,
+    native_bridge_supported: true,
     export_include_dirs: ["include"],
     target: {
         vendor: {
@@ -57,6 +58,7 @@
     },
     recovery_available: true,
     host_supported: true,
+    native_bridge_supported: true,
     srcs: [
         "config_utils.cpp",
         "canned_fs_config.cpp",
diff --git a/libcutils/fs_config.cpp b/libcutils/fs_config.cpp
index 6217bc8..494a06f 100644
--- a/libcutils/fs_config.cpp
+++ b/libcutils/fs_config.cpp
@@ -88,7 +88,6 @@
     { 00771, AID_SYSTEM,       AID_SYSTEM,       0, "data" },
     { 00755, AID_ROOT,         AID_SYSTEM,       0, "mnt" },
     { 00751, AID_ROOT,         AID_SHELL,        0, "product/bin" },
-    { 00750, AID_ROOT,         AID_SHELL,        0, "sbin" },
     { 00777, AID_ROOT,         AID_ROOT,         0, "sdcard" },
     { 00751, AID_ROOT,         AID_SDCARD_R,     0, "storage" },
     { 00751, AID_ROOT,         AID_SHELL,        0, "system/bin" },
@@ -171,7 +170,6 @@
     { 00600, AID_ROOT,      AID_ROOT,      0, "product_services/build.prop" },
     { 00444, AID_ROOT,      AID_ROOT,      0, product_services_conf_dir + 1 },
     { 00444, AID_ROOT,      AID_ROOT,      0, product_services_conf_file + 1 },
-    { 00750, AID_ROOT,      AID_SHELL,     0, "sbin/fs_mgr" },
     { 00755, AID_ROOT,      AID_SHELL,     0, "system/bin/crash_dump32" },
     { 00755, AID_ROOT,      AID_SHELL,     0, "system/bin/crash_dump64" },
     { 00755, AID_ROOT,      AID_SHELL,     0, "system/bin/debuggerd" },
@@ -216,8 +214,8 @@
     { 00755, AID_ROOT,      AID_ROOT,      0, "bin/*" },
     { 00640, AID_ROOT,      AID_SHELL,     0, "fstab.*" },
     { 00750, AID_ROOT,      AID_SHELL,     0, "init*" },
+    { 00755, AID_ROOT,      AID_SHELL,     0, "odm/bin/*" },
     { 00755, AID_ROOT,      AID_SHELL,     0, "product/bin/*" },
-    { 00750, AID_ROOT,      AID_SHELL,     0, "sbin/*" },
     { 00755, AID_ROOT,      AID_SHELL,     0, "system/bin/*" },
     { 00755, AID_ROOT,      AID_SHELL,     0, "system/xbin/*" },
     { 00755, AID_ROOT,      AID_SHELL,     0, "system/apex/*/bin/*" },
@@ -295,20 +293,21 @@
     const int fnm_flags = FNM_NOESCAPE;
     if (fnmatch(pattern.c_str(), input.c_str(), fnm_flags) == 0) return true;
 
-    static constexpr const char* kSystem = "system/";
-    if (StartsWith(input, kSystem)) {
-        input.erase(0, strlen(kSystem));
-    } else if (input.size() <= strlen(kSystem)) {
-        return false;
-    } else if (StartsWith(pattern, kSystem)) {
-        pattern.erase(0, strlen(kSystem));
-    } else {
-        return false;
+    // Check match between logical partition's files and patterns.
+    static constexpr const char* kLogicalPartitions[] = {"system/product/",
+                                                         "system/product_services/",
+                                                         "system/vendor/",
+                                                         "vendor/odm/"};
+    for (auto& logical_partition : kLogicalPartitions) {
+        if (StartsWith(input, logical_partition)) {
+            std::string input_in_partition = input.substr(input.find('/') + 1);
+            if (!is_partition(input_in_partition)) continue;
+            if (fnmatch(pattern.c_str(), input_in_partition.c_str(), fnm_flags) == 0) {
+                return true;
+            }
+        }
     }
-
-    if (!is_partition(pattern)) return false;
-    if (!is_partition(input)) return false;
-    return fnmatch(pattern.c_str(), input.c_str(), fnm_flags) == 0;
+    return false;
 }
 #ifndef __ANDROID_VNDK__
 auto __for_testing_only__fs_config_cmp = fs_config_cmp;
diff --git a/libion/ion_4.12.h b/libion/ion_4.12.h
index 6ae79d4..614510c 100644
--- a/libion/ion_4.12.h
+++ b/libion/ion_4.12.h
@@ -1,125 +1,50 @@
-/*
- * Adapted from drivers/staging/android/uapi/ion.h
- *
- * Copyright (C) 2011 Google, Inc.
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- */
-
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   This header was automatically generated from a Linux kernel header
+ ***   of the same name, to make information necessary for userspace to
+ ***   call into the kernel available to libc.  It contains only constants,
+ ***   structures, and macros generated from the original header, and thus,
+ ***   contains no copyrightable information.
+ ***
+ ***   To edit the content of this header, modify the corresponding
+ ***   source file (e.g. under external/kernel-headers/original/) then
+ ***   run bionic/libc/kernel/tools/update_all.py
+ ***
+ ***   Any manual change here will be lost the next time this script will
+ ***   be run. You've been warned!
+ ***
+ ****************************************************************************
+ ****************************************************************************/
 #ifndef _UAPI_LINUX_ION_NEW_H
 #define _UAPI_LINUX_ION_NEW_H
-
 #include <linux/ioctl.h>
 #include <linux/types.h>
-
 #define ION_NUM_HEAP_IDS (sizeof(unsigned int) * 8)
-
-/**
- * DOC: Ion Userspace API
- *
- * create a client by opening /dev/ion
- * most operations handled via following ioctls
- *
- */
-
-/**
- * struct ion_new_allocation_data - metadata passed from userspace for allocations
- * @len:		size of the allocation
- * @heap_id_mask:	mask of heap ids to allocate from
- * @flags:		flags passed to heap
- * @handle:		pointer that will be populated with a cookie to use to
- *			refer to this allocation
- *
- * Provided by userspace as an argument to the ioctl - added _new to denote
- * this belongs to the new ION interface.
- */
 struct ion_new_allocation_data {
-    __u64 len;
-    __u32 heap_id_mask;
-    __u32 flags;
-    __u32 fd;
-    __u32 unused;
+  __u64 len;
+  __u32 heap_id_mask;
+  __u32 flags;
+  __u32 fd;
+  __u32 unused;
 };
-
 #define MAX_HEAP_NAME 32
-
-/**
- * struct ion_heap_data - data about a heap
- * @name - first 32 characters of the heap name
- * @type - heap type
- * @heap_id - heap id for the heap
- */
 struct ion_heap_data {
-    char name[MAX_HEAP_NAME];
-    __u32 type;
-    __u32 heap_id;
-    __u32 reserved0;
-    __u32 reserved1;
-    __u32 reserved2;
+  char name[MAX_HEAP_NAME];
+  __u32 type;
+  __u32 heap_id;
+  __u32 reserved0;
+  __u32 reserved1;
+  __u32 reserved2;
 };
-
-/**
- * struct ion_heap_query - collection of data about all heaps
- * @cnt - total number of heaps to be copied
- * @heaps - buffer to copy heap data
- */
 struct ion_heap_query {
-    __u32 cnt;       /* Total number of heaps to be copied */
-    __u32 reserved0; /* align to 64bits */
-    __u64 heaps;     /* buffer to be populated */
-    __u32 reserved1;
-    __u32 reserved2;
+  __u32 cnt;
+  __u32 reserved0;
+  __u64 heaps;
+  __u32 reserved1;
+  __u32 reserved2;
 };
-
 #define ION_IOC_MAGIC 'I'
-
-/**
- * DOC: ION_IOC_NEW_ALLOC - allocate memory
- *
- * Takes an ion_allocation_data struct and returns it with the handle field
- * populated with the opaque handle for the allocation.
- * TODO: This IOCTL will clash by design; however, only one of
- *  ION_IOC_ALLOC or ION_IOC_NEW_ALLOC paths will be exercised,
- *  so this should not conflict.
- */
 #define ION_IOC_NEW_ALLOC _IOWR(ION_IOC_MAGIC, 0, struct ion_new_allocation_data)
-
-/**
- * DOC: ION_IOC_FREE - free memory
- *
- * Takes an ion_handle_data struct and frees the handle.
- *
- * #define ION_IOC_FREE		_IOWR(ION_IOC_MAGIC, 1, struct ion_handle_data)
- * This will come from the older kernels, so don't redefine here
- */
-
-/**
- * DOC: ION_IOC_SHARE - creates a file descriptor to use to share an allocation
- *
- * Takes an ion_fd_data struct with the handle field populated with a valid
- * opaque handle.  Returns the struct with the fd field set to a file
- * descriptor open in the current address space.  This file descriptor
- * can then be passed to another process.  The corresponding opaque handle can
- * be retrieved via ION_IOC_IMPORT.
- *
- * #define ION_IOC_SHARE		_IOWR(ION_IOC_MAGIC, 4, struct ion_fd_data)
- * This will come from the older kernels, so don't redefine here
- */
-
-/**
- * DOC: ION_IOC_HEAP_QUERY - information about available heaps
- *
- * Takes an ion_heap_query structure and populates information about
- * available Ion heaps.
- */
 #define ION_IOC_HEAP_QUERY _IOWR(ION_IOC_MAGIC, 8, struct ion_heap_query)
-
-#endif /* _UAPI_LINUX_ION_NEW_H */
+#endif
diff --git a/libion/original-kernel-headers/linux/ion_4.12.h b/libion/original-kernel-headers/linux/ion_4.12.h
new file mode 100644
index 0000000..6ae79d4
--- /dev/null
+++ b/libion/original-kernel-headers/linux/ion_4.12.h
@@ -0,0 +1,125 @@
+/*
+ * Adapted from drivers/staging/android/uapi/ion.h
+ *
+ * Copyright (C) 2011 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef _UAPI_LINUX_ION_NEW_H
+#define _UAPI_LINUX_ION_NEW_H
+
+#include <linux/ioctl.h>
+#include <linux/types.h>
+
+#define ION_NUM_HEAP_IDS (sizeof(unsigned int) * 8)
+
+/**
+ * DOC: Ion Userspace API
+ *
+ * create a client by opening /dev/ion
+ * most operations handled via following ioctls
+ *
+ */
+
+/**
+ * struct ion_new_allocation_data - metadata passed from userspace for allocations
+ * @len:		size of the allocation
+ * @heap_id_mask:	mask of heap ids to allocate from
+ * @flags:		flags passed to heap
+ * @handle:		pointer that will be populated with a cookie to use to
+ *			refer to this allocation
+ *
+ * Provided by userspace as an argument to the ioctl - added _new to denote
+ * this belongs to the new ION interface.
+ */
+struct ion_new_allocation_data {
+    __u64 len;
+    __u32 heap_id_mask;
+    __u32 flags;
+    __u32 fd;
+    __u32 unused;
+};
+
+#define MAX_HEAP_NAME 32
+
+/**
+ * struct ion_heap_data - data about a heap
+ * @name - first 32 characters of the heap name
+ * @type - heap type
+ * @heap_id - heap id for the heap
+ */
+struct ion_heap_data {
+    char name[MAX_HEAP_NAME];
+    __u32 type;
+    __u32 heap_id;
+    __u32 reserved0;
+    __u32 reserved1;
+    __u32 reserved2;
+};
+
+/**
+ * struct ion_heap_query - collection of data about all heaps
+ * @cnt - total number of heaps to be copied
+ * @heaps - buffer to copy heap data
+ */
+struct ion_heap_query {
+    __u32 cnt;       /* Total number of heaps to be copied */
+    __u32 reserved0; /* align to 64bits */
+    __u64 heaps;     /* buffer to be populated */
+    __u32 reserved1;
+    __u32 reserved2;
+};
+
+#define ION_IOC_MAGIC 'I'
+
+/**
+ * DOC: ION_IOC_NEW_ALLOC - allocate memory
+ *
+ * Takes an ion_allocation_data struct and returns it with the handle field
+ * populated with the opaque handle for the allocation.
+ * TODO: This IOCTL will clash by design; however, only one of
+ *  ION_IOC_ALLOC or ION_IOC_NEW_ALLOC paths will be exercised,
+ *  so this should not conflict.
+ */
+#define ION_IOC_NEW_ALLOC _IOWR(ION_IOC_MAGIC, 0, struct ion_new_allocation_data)
+
+/**
+ * DOC: ION_IOC_FREE - free memory
+ *
+ * Takes an ion_handle_data struct and frees the handle.
+ *
+ * #define ION_IOC_FREE		_IOWR(ION_IOC_MAGIC, 1, struct ion_handle_data)
+ * This will come from the older kernels, so don't redefine here
+ */
+
+/**
+ * DOC: ION_IOC_SHARE - creates a file descriptor to use to share an allocation
+ *
+ * Takes an ion_fd_data struct with the handle field populated with a valid
+ * opaque handle.  Returns the struct with the fd field set to a file
+ * descriptor open in the current address space.  This file descriptor
+ * can then be passed to another process.  The corresponding opaque handle can
+ * be retrieved via ION_IOC_IMPORT.
+ *
+ * #define ION_IOC_SHARE		_IOWR(ION_IOC_MAGIC, 4, struct ion_fd_data)
+ * This will come from the older kernels, so don't redefine here
+ */
+
+/**
+ * DOC: ION_IOC_HEAP_QUERY - information about available heaps
+ *
+ * Takes an ion_heap_query structure and populates information about
+ * available Ion heaps.
+ */
+#define ION_IOC_HEAP_QUERY _IOWR(ION_IOC_MAGIC, 8, struct ion_heap_query)
+
+#endif /* _UAPI_LINUX_ION_NEW_H */
diff --git a/libkeyutils/mini_keyctl_utils.cpp b/libkeyutils/mini_keyctl_utils.cpp
index 56afea4..79b4680 100644
--- a/libkeyutils/mini_keyctl_utils.cpp
+++ b/libkeyutils/mini_keyctl_utils.cpp
@@ -18,6 +18,7 @@
 
 #include <dirent.h>
 #include <errno.h>
+#include <error.h>
 #include <sys/types.h>
 #include <unistd.h>
 
@@ -29,7 +30,6 @@
 #include <vector>
 
 #include <android-base/file.h>
-#include <android-base/logging.h>
 #include <android-base/parseint.h>
 #include <android-base/properties.h>
 #include <android-base/strings.h>
@@ -47,22 +47,18 @@
 // kernel keyring, the id is looked up from /proc/keys. The keyring description may contain other
 // information in the descritption section depending on the key type, only the first word in the
 // keyring description is used for searching.
-static bool GetKeyringId(const std::string& keyring_desc, key_serial_t* keyring_id) {
-  if (!keyring_id) {
-    LOG(ERROR) << "keyring_id is null";
-    return false;
-  }
-
+static key_serial_t GetKeyringIdOrDie(const std::string& keyring_desc) {
   // If the keyring id is already a hex number, directly convert it to keyring id
-  if (android::base::ParseInt(keyring_desc.c_str(), keyring_id)) {
-    return true;
+  key_serial_t keyring_id;
+  if (android::base::ParseInt(keyring_desc.c_str(), &keyring_id)) {
+    return keyring_id;
   }
 
   // Only keys allowed by SELinux rules will be shown here.
   std::ifstream proc_keys_file("/proc/keys");
   if (!proc_keys_file.is_open()) {
-    PLOG(ERROR) << "Failed to open /proc/keys";
-    return false;
+    error(1, errno, "Failed to open /proc/keys");
+    return -1;
   }
 
   std::string line;
@@ -71,7 +67,7 @@
     if (tokens.size() < 9) {
       continue;
     }
-    std::string key_id = tokens[0];
+    std::string key_id = "0x" + tokens[0];
     std::string key_type = tokens[7];
     // The key description may contain space.
     std::string key_desc_prefix = tokens[8];
@@ -80,21 +76,19 @@
     if (key_type != "keyring" || key_desc_prefix != key_desc_pattern) {
       continue;
     }
-    *keyring_id = std::stoi(key_id, nullptr, 16);
-    return true;
+    if (!android::base::ParseInt(key_id.c_str(), &keyring_id)) {
+      error(1, 0, "Unexpected key format in /proc/keys: %s", key_id.c_str());
+      return -1;
+    }
+    return keyring_id;
   }
-  return false;
+  return -1;
 }
 
 int Unlink(key_serial_t key, const std::string& keyring) {
-  key_serial_t keyring_id;
-  if (!GetKeyringId(keyring, &keyring_id)) {
-    LOG(ERROR) << "Can't find keyring " << keyring;
-    return 1;
-  }
-
+  key_serial_t keyring_id = GetKeyringIdOrDie(keyring);
   if (keyctl_unlink(key, keyring_id) < 0) {
-    PLOG(ERROR) << "Failed to unlink key 0x" << std::hex << key << " from keyring " << keyring_id;
+    error(1, errno, "Failed to unlink key %x from keyring %s", key, keyring.c_str());
     return 1;
   }
   return 0;
@@ -103,63 +97,49 @@
 int Add(const std::string& type, const std::string& desc, const std::string& data,
         const std::string& keyring) {
   if (data.size() > kMaxCertSize) {
-    LOG(ERROR) << "Certificate too large";
+    error(1, 0, "Certificate too large");
     return 1;
   }
 
-  key_serial_t keyring_id;
-  if (!GetKeyringId(keyring, &keyring_id)) {
-    LOG(ERROR) << "Can not find keyring id";
-    return 1;
-  }
-
+  key_serial_t keyring_id = GetKeyringIdOrDie(keyring);
   key_serial_t key = add_key(type.c_str(), desc.c_str(), data.c_str(), data.size(), keyring_id);
 
   if (key < 0) {
-    PLOG(ERROR) << "Failed to add key";
+    error(1, errno, "Failed to add key");
     return 1;
   }
 
-  LOG(INFO) << "Key " << desc << " added to " << keyring << " with key id: 0x" << std::hex << key;
+  std::cout << key << std::endl;
   return 0;
 }
 
 int Padd(const std::string& type, const std::string& desc, const std::string& keyring) {
-  key_serial_t keyring_id;
-  if (!GetKeyringId(keyring, &keyring_id)) {
-    LOG(ERROR) << "Can not find keyring id";
-    return 1;
-  }
+  key_serial_t keyring_id = GetKeyringIdOrDie(keyring);
 
   // read from stdin to get the certificates
   std::istreambuf_iterator<char> begin(std::cin), end;
   std::string data(begin, end);
 
   if (data.size() > kMaxCertSize) {
-    LOG(ERROR) << "Certificate too large";
+    error(1, 0, "Certificate too large");
     return 1;
   }
 
   key_serial_t key = add_key(type.c_str(), desc.c_str(), data.c_str(), data.size(), keyring_id);
 
   if (key < 0) {
-    PLOG(ERROR) << "Failed to add key";
+    error(1, errno, "Failed to add key");
     return 1;
   }
 
-  LOG(INFO) << "Key " << desc << " added to " << keyring << " with key id: 0x" << std::hex << key;
+  std::cout << key << std::endl;
   return 0;
 }
 
 int RestrictKeyring(const std::string& keyring) {
-  key_serial_t keyring_id;
-  if (!GetKeyringId(keyring, &keyring_id)) {
-    LOG(ERROR) << "Cannot find keyring id";
-    return 1;
-  }
-
+  key_serial_t keyring_id = GetKeyringIdOrDie(keyring);
   if (keyctl_restrict_keyring(keyring_id, nullptr, nullptr) < 0) {
-    PLOG(ERROR) << "Cannot restrict keyring " << keyring;
+    error(1, errno, "Cannot restrict keyring '%s'", keyring.c_str());
     return 1;
   }
   return 0;
@@ -172,11 +152,11 @@
   context.resize(kMaxSupportedSize);
   long retval = keyctl_get_security(key, context.data(), kMaxSupportedSize);
   if (retval < 0) {
-    PLOG(ERROR) << "Cannot get security context of key 0x" << std::hex << key;
+    error(1, errno, "Cannot get security context of key %x", key);
     return std::string();
   }
   if (retval > kMaxSupportedSize) {
-    LOG(ERROR) << "The key has unexpectedly long security context than " << kMaxSupportedSize;
+    error(1, 0, "The key has unexpectedly long security context than %d", kMaxSupportedSize);
     return std::string();
   }
   context.resize(retval);
diff --git a/liblog/Android.bp b/liblog/Android.bp
index da475cb..53d3ab3 100644
--- a/liblog/Android.bp
+++ b/liblog/Android.bp
@@ -45,6 +45,7 @@
     host_supported: true,
     vendor_available: true,
     recovery_available: true,
+    native_bridge_supported: true,
     export_include_dirs: ["include"],
     system_shared_libs: [],
     stl: "none",
@@ -67,6 +68,7 @@
     name: "liblog",
     host_supported: true,
     recovery_available: true,
+    native_bridge_supported: true,
     srcs: liblog_sources,
 
     target: {
@@ -138,6 +140,7 @@
 
 llndk_library {
     name: "liblog",
+    native_bridge_supported: true,
     symbol_file: "liblog.map.txt",
     export_include_dirs: ["include_vndk"],
 }
diff --git a/liblog/include/android/log.h b/liblog/include/android/log.h
index b2f0ed9..935590d 100644
--- a/liblog/include/android/log.h
+++ b/liblog/include/android/log.h
@@ -122,9 +122,10 @@
  *
  * Most callers should use
  * [assert(3)](http://man7.org/linux/man-pages/man3/assert.3.html) from
- * `<assert.h>` instead, or the `__assert` and `__assert2` functions provided by
- * bionic if more control is needed. They support automatically including the
- * source filename and line number more conveniently than this function.
+ * `&lt;assert.h&gt;` instead, or the `__assert` and `__assert2` functions
+ * provided by bionic if more control is needed. They support automatically
+ * including the source filename and line number more conveniently than this
+ * function.
  */
 void __android_log_assert(const char* cond, const char* tag, const char* fmt,
                           ...)
diff --git a/liblog/log_portability.h b/liblog/log_portability.h
index 468a498..b7279d1 100644
--- a/liblog/log_portability.h
+++ b/liblog/log_portability.h
@@ -19,16 +19,6 @@
 #include <sys/cdefs.h>
 #include <unistd.h>
 
-/*
- * Declare this library function as reimplementation.
- * Prevent circular dependencies, but allow _real_ library to hijack
- */
-#if defined(_WIN32)
-#define LIBLOG_WEAK static /* Accept that it is totally private */
-#else
-#define LIBLOG_WEAK extern "C" __attribute__((weak, visibility("default")))
-#endif
-
 /* possible missing definitions in sys/cdefs.h */
 
 /* DECLS */
diff --git a/liblog/logprint.cpp b/liblog/logprint.cpp
index bc056cb..6b5ea4c 100644
--- a/liblog/logprint.cpp
+++ b/liblog/logprint.cpp
@@ -33,6 +33,7 @@
 #include <string.h>
 #include <sys/param.h>
 #include <sys/types.h>
+#include <wchar.h>
 
 #include <cutils/list.h>
 #include <log/log.h>
@@ -1134,66 +1135,13 @@
 }
 
 /*
- * One utf8 character at a time
- *
- * Returns the length of the utf8 character in the buffer,
- * or -1 if illegal or truncated
- *
- * Open coded from libutils/Unicode.cpp, borrowed from utf8_length(),
- * can not remove from here because of library circular dependencies.
- * Expect one-day utf8_character_length with the same signature could
- * _also_ be part of libutils/Unicode.cpp if its usefullness needs to
- * propagate globally.
- */
-LIBLOG_WEAK ssize_t utf8_character_length(const char* src, size_t len) {
-  const char* cur = src;
-  const char first_char = *cur++;
-  static const uint32_t kUnicodeMaxCodepoint = 0x0010FFFF;
-  int32_t mask, to_ignore_mask;
-  size_t num_to_read;
-  uint32_t utf32;
-
-  if ((first_char & 0x80) == 0) { /* ASCII */
-    return first_char ? 1 : -1;
-  }
-
-  /*
-   * (UTF-8's character must not be like 10xxxxxx,
-   *  but 110xxxxx, 1110xxxx, ... or 1111110x)
-   */
-  if ((first_char & 0x40) == 0) {
-    return -1;
-  }
-
-  for (utf32 = 1, num_to_read = 1, mask = 0x40, to_ignore_mask = 0x80;
-       num_to_read < 5 && (first_char & mask); num_to_read++, to_ignore_mask |= mask, mask >>= 1) {
-    if (num_to_read > len) {
-      return -1;
-    }
-    if ((*cur & 0xC0) != 0x80) { /* can not be 10xxxxxx? */
-      return -1;
-    }
-    utf32 = (utf32 << 6) + (*cur++ & 0b00111111);
-  }
-  /* "first_char" must be (110xxxxx - 11110xxx) */
-  if (num_to_read >= 5) {
-    return -1;
-  }
-  to_ignore_mask |= mask;
-  utf32 |= ((~to_ignore_mask) & first_char) << (6 * (num_to_read - 1));
-  if (utf32 > kUnicodeMaxCodepoint) {
-    return -1;
-  }
-  return num_to_read;
-}
-
-/*
  * Convert to printable from message to p buffer, return string length. If p is
  * NULL, do not copy, but still return the expected string length.
  */
-static size_t convertPrintable(char* p, const char* message, size_t messageLen) {
+size_t convertPrintable(char* p, const char* message, size_t messageLen) {
   char* begin = p;
   bool print = p != NULL;
+  mbstate_t mb_state = {};
 
   while (messageLen) {
     char buf[6];
@@ -1201,11 +1149,10 @@
     if ((size_t)len > messageLen) {
       len = messageLen;
     }
-    len = utf8_character_length(message, len);
+    len = mbrtowc(nullptr, message, len, &mb_state);
 
     if (len < 0) {
-      snprintf(buf, sizeof(buf), ((messageLen > 1) && isdigit(message[1])) ? "\\%03o" : "\\%o",
-               *message & 0377);
+      snprintf(buf, sizeof(buf), "\\x%02X", static_cast<unsigned char>(*message));
       len = 1;
     } else {
       buf[0] = '\0';
@@ -1225,7 +1172,7 @@
         } else if (*message == '\\') {
           strcpy(buf, "\\\\");
         } else if ((*message < ' ') || (*message & 0x80)) {
-          snprintf(buf, sizeof(buf), "\\%o", *message & 0377);
+          snprintf(buf, sizeof(buf), "\\x%02X", static_cast<unsigned char>(*message));
         }
       }
       if (!buf[0]) {
diff --git a/liblog/tests/Android.bp b/liblog/tests/Android.bp
index 50755ce..d9d1a21 100644
--- a/liblog/tests/Android.bp
+++ b/liblog/tests/Android.bp
@@ -62,6 +62,7 @@
         "log_system_test.cpp",
         "log_time_test.cpp",
         "log_wrap_test.cpp",
+        "logprint_test.cpp",
     ],
     shared_libs: [
         "libcutils",
diff --git a/liblog/tests/logprint_test.cpp b/liblog/tests/logprint_test.cpp
new file mode 100644
index 0000000..7ca02ac
--- /dev/null
+++ b/liblog/tests/logprint_test.cpp
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <gtest/gtest.h>
+
+size_t convertPrintable(char* p, const char* message, size_t messageLen);
+
+TEST(liblog, convertPrintable_ascii) {
+  auto input = "easy string, output same";
+  auto output_size = convertPrintable(nullptr, input, strlen(input));
+  EXPECT_EQ(output_size, strlen(input));
+
+  char output[output_size];
+
+  output_size = convertPrintable(output, input, strlen(input));
+  EXPECT_EQ(output_size, strlen(input));
+  EXPECT_STREQ(input, output);
+}
+
+TEST(liblog, convertPrintable_escapes) {
+  // Note that \t is not escaped.
+  auto input = "escape\a\b\t\v\f\r\\";
+  auto expected_output = "escape\\a\\b\t\\v\\f\\r\\\\";
+  auto output_size = convertPrintable(nullptr, input, strlen(input));
+  EXPECT_EQ(output_size, strlen(expected_output));
+
+  char output[output_size];
+
+  output_size = convertPrintable(output, input, strlen(input));
+  EXPECT_EQ(output_size, strlen(expected_output));
+  EXPECT_STREQ(expected_output, output);
+}
+
+TEST(liblog, convertPrintable_validutf8) {
+  auto input = u8"¢ह€𐍈";
+  auto output_size = convertPrintable(nullptr, input, strlen(input));
+  EXPECT_EQ(output_size, strlen(input));
+
+  char output[output_size];
+
+  output_size = convertPrintable(output, input, strlen(input));
+  EXPECT_EQ(output_size, strlen(input));
+  EXPECT_STREQ(input, output);
+}
+
+TEST(liblog, convertPrintable_invalidutf8) {
+  auto input = "\x80\xC2\x01\xE0\xA4\x06\xE0\x06\xF0\x90\x8D\x06\xF0\x90\x06\xF0\x0E";
+  auto expected_output =
+      "\\x80\\xC2\\x01\\xE0\\xA4\\x06\\xE0\\x06\\xF0\\x90\\x8D\\x06\\xF0\\x90\\x06\\xF0\\x0E";
+  auto output_size = convertPrintable(nullptr, input, strlen(input));
+  EXPECT_EQ(output_size, strlen(expected_output));
+
+  char output[output_size];
+
+  output_size = convertPrintable(output, input, strlen(input));
+  EXPECT_EQ(output_size, strlen(expected_output));
+  EXPECT_STREQ(expected_output, output);
+}
+
+TEST(liblog, convertPrintable_mixed) {
+  auto input =
+      u8"\x80\xC2¢ह€𐍈\x01\xE0\xA4\x06¢ह€𐍈\xE0\x06\a\b\xF0\x90¢ह€𐍈\x8D\x06\xF0\t\t\x90\x06\xF0\x0E";
+  auto expected_output =
+      u8"\\x80\\xC2¢ह€𐍈\\x01\\xE0\\xA4\\x06¢ह€𐍈\\xE0\\x06\\a\\b\\xF0\\x90¢ह€𐍈\\x8D\\x06\\xF0\t\t"
+      u8"\\x90\\x06\\xF0\\x0E";
+  auto output_size = convertPrintable(nullptr, input, strlen(input));
+  EXPECT_EQ(output_size, strlen(expected_output));
+
+  char output[output_size];
+
+  output_size = convertPrintable(output, input, strlen(input));
+  EXPECT_EQ(output_size, strlen(expected_output));
+  EXPECT_STREQ(expected_output, output);
+}
diff --git a/libnativeloader/Android.bp b/libnativeloader/Android.bp
index 66cb49f..debc43f 100644
--- a/libnativeloader/Android.bp
+++ b/libnativeloader/Android.bp
@@ -17,7 +17,9 @@
     name: "libnativeloader",
     defaults: ["libnativeloader-defaults"],
     host_supported: true,
-    srcs: ["native_loader.cpp"],
+    srcs: [
+        "native_loader.cpp",
+    ],
     shared_libs: [
         "libnativehelper",
         "liblog",
@@ -26,6 +28,11 @@
     ],
     target: {
         android: {
+            srcs: [
+                "library_namespaces.cpp",
+                "native_loader_namespace.cpp",
+                "public_libraries.cpp",
+            ],
             shared_libs: [
                 "libdl_android",
             ],
diff --git a/libnativeloader/README.md b/libnativeloader/README.md
new file mode 100644
index 0000000..46f6fdd
--- /dev/null
+++ b/libnativeloader/README.md
@@ -0,0 +1,84 @@
+libnativeloader
+===============================================================================
+
+Overview
+-------------------------------------------------------------------------------
+libnativeloader is responsible for loading native shared libraries (`*.so`
+files) inside the Android Runtime (ART). The native shared libraries could be
+app-provided JNI libraries or public native libraries like `libc.so` provided
+by the platform.
+
+The most typical use case of this library is calling `System.loadLibrary(name)`.
+When the method is called, the ART runtime delegates the call to this library
+along with the reference to the classloader where the call was made.  Then this
+library finds the linker namespace (named `classloader-namespace`) that is
+associated with the given classloader, and tries to load the requested library
+from the namespace. The actual searching, loading, and linking of the library
+is performed by the dynamic linker.
+
+The linker namespace is created when an APK is loaded into the process, and is
+associated with the classloader that loaded the APK. The linker namespace is
+configured so that only the JNI libraries embedded in the APK is accessible
+from the namespace, thus preventing an APK from loading JNI libraries of other
+APKs.
+
+The linker namespace is also configured differently depending on other
+characteristics of the APK such as whether or not the APK is bundled with the
+platform. In case of the unbundled, i.e., downloaded or updated APK, only the
+public native libraries that is listed in `/system/etc/public.libraries.txt`
+are available from the platform, whereas in case of the bundled, all libraries
+under `/system/lib` are available (i.e. shared). In case when the unbundled
+app is from `/vendor` or `/product` partition, the app is additionally provided
+with the [VNDK-SP](https://source.android.com/devices/architecture/vndk#sp-hal)
+libraries. As the platform is getting modularized with
+[APEX](https://android.googlesource.com/platform/system/apex/+/refs/heads/master/docs/README.md),
+some libraries are no longer provided from platform, but from the APEXes which
+have their own linker namespaces. For example, ICU libraries `libicuuc.so` and
+`libicui18n.so` are from the runtime APEX.
+
+The list of public native libraries is not static. The default set of libraries
+are defined in AOSP, but partners can extend it to include their own libraries.
+Currently, following extensions are available:
+
+- `/vendor/etc/public.libraries.txt`: libraries in `/vendor/lib` that are
+specific to the underlying SoC, e.g. GPU, DSP, etc.
+- `/{system|product}/etc/public.libraries-<companyname>.txt`: libraries in
+`/{system|system}/lib` that a device manufacturer has newly added. The
+libraries should be named as `lib<name>.<companyname>.so` as in
+`libFoo.acme.so`.
+
+Note that, due to the naming constraint requiring `.<companyname>.so` suffix, it
+is prohibited for a device manufacturer to expose an AOSP-defined private
+library, e.g. libgui.so, libart.so, etc., to APKs.
+
+Lastly, libnativeloader is responsible for abstracting the two types of the
+dynamic linker interface: `libdl.so` and `libnativebridge.so`. The former is
+for non-translated, e.g. ARM-on-ARM, libraries, while the latter is for
+loading libraries in a translated environment such as ARM-on-x86.
+
+Implementation
+-------------------------------------------------------------------------------
+Implementation wise, libnativeloader consists of four parts:
+
+- `native_loader.cpp`
+- `library_namespaces.cpp`
+- `native_loader_namespace.cpp`
+- `public_libraries.cpp`
+
+`native_loader.cpp` implements the public interface of this library. It is just
+a thin wrapper around `library_namespaces.cpp` and `native_loader_namespace.cpp`.
+
+`library_namespaces.cpp` implements the singleton class `LibraryNamespaces` which
+is a manager-like entity that is responsible for creating and configuring
+linker namespaces and finding an already created linker namespace for a given
+classloader.
+
+`native_loader_namesapces.cpp` implements the class `NativeLoaderNamespace` that
+models a linker namespace. It's main job is to abstract the two types of the
+dynamic linker interface so that other parts of this library do not have to know
+the differences of the interfaces.
+
+`public_libraries.cpp` is responsible for reading `*.txt` files for the public
+native libraries from the various partitions. It can be considered as a part of
+`LibraryNamespaces` but is separated from it to hide the details of the parsing
+routines.
diff --git a/libnativeloader/library_namespaces.cpp b/libnativeloader/library_namespaces.cpp
new file mode 100644
index 0000000..f7f972f
--- /dev/null
+++ b/libnativeloader/library_namespaces.cpp
@@ -0,0 +1,322 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "library_namespaces.h"
+
+#include <dirent.h>
+#include <dlfcn.h>
+
+#include <regex>
+#include <string>
+#include <vector>
+
+#include <android-base/file.h>
+#include <android-base/logging.h>
+#include <android-base/macros.h>
+#include <android-base/properties.h>
+#include <android-base/strings.h>
+#include <nativehelper/ScopedUtfChars.h>
+
+#include "nativeloader/dlext_namespaces.h"
+#include "public_libraries.h"
+#include "utils.h"
+
+namespace android::nativeloader {
+
+namespace {
+// The device may be configured to have the vendor libraries loaded to a separate namespace.
+// For historical reasons this namespace was named sphal but effectively it is intended
+// to use to load vendor libraries to separate namespace with controlled interface between
+// vendor and system namespaces.
+constexpr const char* kVendorNamespaceName = "sphal";
+constexpr const char* kVndkNamespaceName = "vndk";
+constexpr const char* kRuntimeNamespaceName = "runtime";
+
+// classloader-namespace is a linker namespace that is created for the loaded
+// app. To be specific, it is created for the app classloader. When
+// System.load() is called from a Java class that is loaded from the
+// classloader, the classloader-namespace namespace associated with that
+// classloader is selected for dlopen. The namespace is configured so that its
+// search path is set to the app-local JNI directory and it is linked to the
+// platform namespace with the names of libs listed in the public.libraries.txt.
+// This way an app can only load its own JNI libraries along with the public libs.
+constexpr const char* kClassloaderNamespaceName = "classloader-namespace";
+// Same thing for vendor APKs.
+constexpr const char* kVendorClassloaderNamespaceName = "vendor-classloader-namespace";
+
+// (http://b/27588281) This is a workaround for apps using custom classloaders and calling
+// System.load() with an absolute path which is outside of the classloader library search path.
+// This list includes all directories app is allowed to access this way.
+constexpr const char* kWhitelistedDirectories = "/data:/mnt/expand";
+
+constexpr const char* kVendorLibPath = "/vendor/" LIB;
+constexpr const char* kProductLibPath = "/product/" LIB ":/system/product/" LIB;
+
+const std::regex kVendorDexPathRegex("(^|:)/vendor/");
+const std::regex kProductDexPathRegex("(^|:)(/system)?/product/");
+
+// Define origin of APK if it is from vendor partition or product partition
+typedef enum {
+  APK_ORIGIN_DEFAULT = 0,
+  APK_ORIGIN_VENDOR = 1,
+  APK_ORIGIN_PRODUCT = 2,
+} ApkOrigin;
+
+jobject GetParentClassLoader(JNIEnv* env, jobject class_loader) {
+  jclass class_loader_class = env->FindClass("java/lang/ClassLoader");
+  jmethodID get_parent =
+      env->GetMethodID(class_loader_class, "getParent", "()Ljava/lang/ClassLoader;");
+
+  return env->CallObjectMethod(class_loader, get_parent);
+}
+
+ApkOrigin GetApkOriginFromDexPath(JNIEnv* env, jstring dex_path) {
+  ApkOrigin apk_origin = APK_ORIGIN_DEFAULT;
+
+  if (dex_path != nullptr) {
+    ScopedUtfChars dex_path_utf_chars(env, dex_path);
+
+    if (std::regex_search(dex_path_utf_chars.c_str(), kVendorDexPathRegex)) {
+      apk_origin = APK_ORIGIN_VENDOR;
+    }
+
+    if (std::regex_search(dex_path_utf_chars.c_str(), kProductDexPathRegex)) {
+      LOG_ALWAYS_FATAL_IF(apk_origin == APK_ORIGIN_VENDOR,
+                          "Dex path contains both vendor and product partition : %s",
+                          dex_path_utf_chars.c_str());
+
+      apk_origin = APK_ORIGIN_PRODUCT;
+    }
+  }
+  return apk_origin;
+}
+
+}  // namespace
+
+void LibraryNamespaces::Initialize() {
+  // Once public namespace is initialized there is no
+  // point in running this code - it will have no effect
+  // on the current list of public libraries.
+  if (initialized_) {
+    return;
+  }
+
+  // android_init_namespaces() expects all the public libraries
+  // to be loaded so that they can be found by soname alone.
+  //
+  // TODO(dimitry): this is a bit misleading since we do not know
+  // if the vendor public library is going to be opened from /vendor/lib
+  // we might as well end up loading them from /system/lib or /product/lib
+  // For now we rely on CTS test to catch things like this but
+  // it should probably be addressed in the future.
+  for (const auto& soname : android::base::Split(default_public_libraries(), ":")) {
+    LOG_ALWAYS_FATAL_IF(dlopen(soname.c_str(), RTLD_NOW | RTLD_NODELETE) == nullptr,
+                        "Error preloading public library %s: %s", soname.c_str(), dlerror());
+  }
+}
+
+NativeLoaderNamespace* LibraryNamespaces::Create(JNIEnv* env, uint32_t target_sdk_version,
+                                                 jobject class_loader, bool is_shared,
+                                                 jstring dex_path, jstring java_library_path,
+                                                 jstring java_permitted_path,
+                                                 std::string* error_msg) {
+  std::string library_path;  // empty string by default.
+
+  if (java_library_path != nullptr) {
+    ScopedUtfChars library_path_utf_chars(env, java_library_path);
+    library_path = library_path_utf_chars.c_str();
+  }
+
+  ApkOrigin apk_origin = GetApkOriginFromDexPath(env, dex_path);
+
+  // (http://b/27588281) This is a workaround for apps using custom
+  // classloaders and calling System.load() with an absolute path which
+  // is outside of the classloader library search path.
+  //
+  // This part effectively allows such a classloader to access anything
+  // under /data and /mnt/expand
+  std::string permitted_path = kWhitelistedDirectories;
+
+  if (java_permitted_path != nullptr) {
+    ScopedUtfChars path(env, java_permitted_path);
+    if (path.c_str() != nullptr && path.size() > 0) {
+      permitted_path = permitted_path + ":" + path.c_str();
+    }
+  }
+
+  // Initialize the anonymous namespace with the first non-empty library path.
+  if (!library_path.empty() && !initialized_ &&
+      !InitPublicNamespace(library_path.c_str(), error_msg)) {
+    return nullptr;
+  }
+
+  bool found = FindNamespaceByClassLoader(env, class_loader);
+
+  LOG_ALWAYS_FATAL_IF(found, "There is already a namespace associated with this classloader");
+
+  std::string system_exposed_libraries = default_public_libraries();
+  const char* namespace_name = kClassloaderNamespaceName;
+  bool unbundled_vendor_or_product_app = false;
+  if ((apk_origin == APK_ORIGIN_VENDOR ||
+       (apk_origin == APK_ORIGIN_PRODUCT && target_sdk_version > 29)) &&
+      !is_shared) {
+    unbundled_vendor_or_product_app = true;
+    // For vendor / product apks, give access to the vendor / product lib even though
+    // they are treated as unbundled; the libs and apks are still bundled
+    // together in the vendor / product partition.
+    const char* origin_partition;
+    const char* origin_lib_path;
+
+    switch (apk_origin) {
+      case APK_ORIGIN_VENDOR:
+        origin_partition = "vendor";
+        origin_lib_path = kVendorLibPath;
+        break;
+      case APK_ORIGIN_PRODUCT:
+        origin_partition = "product";
+        origin_lib_path = kProductLibPath;
+        break;
+      default:
+        origin_partition = "unknown";
+        origin_lib_path = "";
+    }
+    library_path = library_path + ":" + origin_lib_path;
+    permitted_path = permitted_path + ":" + origin_lib_path;
+
+    // Also give access to LLNDK libraries since they are available to vendors
+    system_exposed_libraries = system_exposed_libraries + ":" + llndk_libraries().c_str();
+
+    // Different name is useful for debugging
+    namespace_name = kVendorClassloaderNamespaceName;
+    ALOGD("classloader namespace configured for unbundled %s apk. library_path=%s",
+          origin_partition, library_path.c_str());
+  } else {
+    // extended public libraries are NOT available to vendor apks, otherwise it
+    // would be system->vendor violation.
+    if (!extended_public_libraries().empty()) {
+      system_exposed_libraries = system_exposed_libraries + ':' + extended_public_libraries();
+    }
+  }
+
+  // Create the app namespace
+  NativeLoaderNamespace* parent_ns = FindParentNamespaceByClassLoader(env, class_loader);
+  auto app_ns =
+      NativeLoaderNamespace::Create(namespace_name, library_path, permitted_path, parent_ns,
+                                    is_shared, target_sdk_version < 24 /* is_greylist_enabled */);
+  if (app_ns.IsNil()) {
+    *error_msg = app_ns.GetError();
+    return nullptr;
+  }
+
+  // ... and link to other namespaces to allow access to some public libraries
+  bool is_bridged = app_ns.IsBridged();
+
+  auto platform_ns = NativeLoaderNamespace::GetPlatformNamespace(is_bridged);
+  if (!app_ns.Link(platform_ns, system_exposed_libraries)) {
+    *error_msg = app_ns.GetError();
+    return nullptr;
+  }
+
+  auto runtime_ns = NativeLoaderNamespace::GetExportedNamespace(kRuntimeNamespaceName, is_bridged);
+  // Runtime apex does not exist in host, and under certain build conditions.
+  if (!runtime_ns.IsNil()) {
+    if (!app_ns.Link(runtime_ns, runtime_public_libraries())) {
+      *error_msg = app_ns.GetError();
+      return nullptr;
+    }
+  }
+
+  // Give access to VNDK-SP libraries from the 'vndk' namespace.
+  if (unbundled_vendor_or_product_app && !vndksp_libraries().empty()) {
+    auto vndk_ns = NativeLoaderNamespace::GetExportedNamespace(kVndkNamespaceName, is_bridged);
+    if (!vndk_ns.IsNil() && !app_ns.Link(vndk_ns, vndksp_libraries())) {
+      *error_msg = app_ns.GetError();
+      return nullptr;
+    }
+  }
+
+  // Note that when vendor_ns is not configured, vendor_ns.IsNil() will be true
+  // and it will result in linking to the default namespace which is expected
+  // behavior in this case.
+  if (!vendor_public_libraries().empty()) {
+    auto vendor_ns = NativeLoaderNamespace::GetExportedNamespace(kVendorNamespaceName, is_bridged);
+    if (!app_ns.Link(vendor_ns, vendor_public_libraries())) {
+      *error_msg = dlerror();
+      return nullptr;
+    }
+  }
+
+  namespaces_.push_back(std::make_pair(env->NewWeakGlobalRef(class_loader), app_ns));
+
+  return &(namespaces_.back().second);
+}
+
+NativeLoaderNamespace* LibraryNamespaces::FindNamespaceByClassLoader(JNIEnv* env,
+                                                                     jobject class_loader) {
+  auto it = std::find_if(namespaces_.begin(), namespaces_.end(),
+                         [&](const std::pair<jweak, NativeLoaderNamespace>& value) {
+                           return env->IsSameObject(value.first, class_loader);
+                         });
+  if (it != namespaces_.end()) {
+    return &it->second;
+  }
+
+  return nullptr;
+}
+
+bool LibraryNamespaces::InitPublicNamespace(const char* library_path, std::string* error_msg) {
+  // Ask native bride if this apps library path should be handled by it
+  bool is_native_bridge = NativeBridgeIsPathSupported(library_path);
+
+  // (http://b/25844435) - Some apps call dlopen from generated code (mono jited
+  // code is one example) unknown to linker in which  case linker uses anonymous
+  // namespace. The second argument specifies the search path for the anonymous
+  // namespace which is the library_path of the classloader.
+  initialized_ = android_init_anonymous_namespace(default_public_libraries().c_str(),
+                                                  is_native_bridge ? nullptr : library_path);
+  if (!initialized_) {
+    *error_msg = dlerror();
+    return false;
+  }
+
+  // and now initialize native bridge namespaces if necessary.
+  if (NativeBridgeInitialized()) {
+    initialized_ = NativeBridgeInitAnonymousNamespace(default_public_libraries().c_str(),
+                                                      is_native_bridge ? library_path : nullptr);
+    if (!initialized_) {
+      *error_msg = NativeBridgeGetError();
+    }
+  }
+
+  return initialized_;
+}
+
+NativeLoaderNamespace* LibraryNamespaces::FindParentNamespaceByClassLoader(JNIEnv* env,
+                                                                           jobject class_loader) {
+  jobject parent_class_loader = GetParentClassLoader(env, class_loader);
+
+  while (parent_class_loader != nullptr) {
+    NativeLoaderNamespace* ns;
+    if ((ns = FindNamespaceByClassLoader(env, parent_class_loader)) != nullptr) {
+      return ns;
+    }
+
+    parent_class_loader = GetParentClassLoader(env, parent_class_loader);
+  }
+
+  return nullptr;
+}
+
+}  // namespace android::nativeloader
diff --git a/libnativeloader/library_namespaces.h b/libnativeloader/library_namespaces.h
new file mode 100644
index 0000000..fd46cdc
--- /dev/null
+++ b/libnativeloader/library_namespaces.h
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#pragma once
+#if !defined(__ANDROID__)
+#error "Not available for host"
+#endif
+
+#define LOG_TAG "nativeloader"
+
+#include "native_loader_namespace.h"
+
+#include <list>
+#include <string>
+
+#include <jni.h>
+
+namespace android::nativeloader {
+
+// LibraryNamespaces is a singleton object that manages NativeLoaderNamespace
+// objects for an app process. Its main job is to create (and configure) a new
+// NativeLoaderNamespace object for a Java ClassLoader, and to find an existing
+// object for a given ClassLoader.
+class LibraryNamespaces {
+ public:
+  LibraryNamespaces() : initialized_(false) {}
+
+  LibraryNamespaces(LibraryNamespaces&&) = default;
+  LibraryNamespaces(const LibraryNamespaces&) = delete;
+  LibraryNamespaces& operator=(const LibraryNamespaces&) = delete;
+
+  void Initialize();
+  void Reset() { namespaces_.clear(); }
+  NativeLoaderNamespace* Create(JNIEnv* env, uint32_t target_sdk_version, jobject class_loader,
+                                bool is_shared, jstring dex_path, jstring java_library_path,
+                                jstring java_permitted_path, std::string* error_msg);
+  NativeLoaderNamespace* FindNamespaceByClassLoader(JNIEnv* env, jobject class_loader);
+
+ private:
+  bool InitPublicNamespace(const char* library_path, std::string* error_msg);
+  NativeLoaderNamespace* FindParentNamespaceByClassLoader(JNIEnv* env, jobject class_loader);
+
+  bool initialized_;
+  std::list<std::pair<jweak, NativeLoaderNamespace>> namespaces_;
+};
+
+}  // namespace android::nativeloader
diff --git a/libnativeloader/native_loader.cpp b/libnativeloader/native_loader.cpp
index e460b1a..0c29324 100644
--- a/libnativeloader/native_loader.cpp
+++ b/libnativeloader/native_loader.cpp
@@ -14,728 +14,64 @@
  * limitations under the License.
  */
 
+#define LOG_TAG "nativeloader"
+
 #include "nativeloader/native_loader.h"
-#include <nativehelper/ScopedUtfChars.h>
 
 #include <dlfcn.h>
-#ifdef __ANDROID__
-#define LOG_TAG "libnativeloader"
-#include "nativeloader/dlext_namespaces.h"
-#include "log/log.h"
-#endif
-#include <dirent.h>
 #include <sys/types.h>
-#include "nativebridge/native_bridge.h"
 
-#include <algorithm>
-#include <list>
 #include <memory>
 #include <mutex>
-#include <regex>
 #include <string>
 #include <vector>
 
 #include <android-base/file.h>
 #include <android-base/macros.h>
 #include <android-base/strings.h>
+#include <nativebridge/native_bridge.h>
+#include <nativehelper/ScopedUtfChars.h>
 
-#ifdef __BIONIC__
-#include <android-base/properties.h>
+#ifdef __ANDROID__
+#include <log/log.h>
+#include "library_namespaces.h"
+#include "nativeloader/dlext_namespaces.h"
 #endif
 
-#define CHECK(predicate) LOG_ALWAYS_FATAL_IF(!(predicate),\
-                                             "%s:%d: %s CHECK '" #predicate "' failed.",\
-                                             __FILE__, __LINE__, __FUNCTION__)
-
-using namespace std::string_literals;
-
 namespace android {
 
+namespace {
 #if defined(__ANDROID__)
-struct NativeLoaderNamespace {
- public:
-  NativeLoaderNamespace()
-      : android_ns_(nullptr), native_bridge_ns_(nullptr) { }
+using android::nativeloader::LibraryNamespaces;
 
-  explicit NativeLoaderNamespace(android_namespace_t* ns)
-      : android_ns_(ns), native_bridge_ns_(nullptr) { }
+constexpr const char* kApexPath = "/apex/";
 
-  explicit NativeLoaderNamespace(native_bridge_namespace_t* ns)
-      : android_ns_(nullptr), native_bridge_ns_(ns) { }
+std::mutex g_namespaces_mutex;
+LibraryNamespaces* g_namespaces = new LibraryNamespaces;
 
-  NativeLoaderNamespace(NativeLoaderNamespace&& that) = default;
-  NativeLoaderNamespace(const NativeLoaderNamespace& that) = default;
-
-  NativeLoaderNamespace& operator=(const NativeLoaderNamespace& that) = default;
-
-  android_namespace_t* get_android_ns() const {
-    CHECK(native_bridge_ns_ == nullptr);
-    return android_ns_;
+android_namespace_t* FindExportedNamespace(const char* caller_location) {
+  std::string location = caller_location;
+  // Lots of implicit assumptions here: we expect `caller_location` to be of the form:
+  // /apex/com.android...modulename/...
+  //
+  // And we extract from it 'modulename', which is the name of the linker namespace.
+  if (android::base::StartsWith(location, kApexPath)) {
+    size_t slash_index = location.find_first_of('/', strlen(kApexPath));
+    LOG_ALWAYS_FATAL_IF((slash_index == std::string::npos),
+                        "Error finding namespace of apex: no slash in path %s", caller_location);
+    size_t dot_index = location.find_last_of('.', slash_index);
+    LOG_ALWAYS_FATAL_IF((dot_index == std::string::npos),
+                        "Error finding namespace of apex: no dot in apex name %s", caller_location);
+    std::string name = location.substr(dot_index + 1, slash_index - dot_index - 1);
+    android_namespace_t* boot_namespace = android_get_exported_namespace(name.c_str());
+    LOG_ALWAYS_FATAL_IF((boot_namespace == nullptr),
+                        "Error finding namespace of apex: no namespace called %s", name.c_str());
+    return boot_namespace;
   }
-
-  native_bridge_namespace_t* get_native_bridge_ns() const {
-    CHECK(android_ns_ == nullptr);
-    return native_bridge_ns_;
-  }
-
-  bool is_android_namespace() const {
-    return native_bridge_ns_ == nullptr;
-  }
-
- private:
-  // Only one of them can be not null
-  android_namespace_t* android_ns_;
-  native_bridge_namespace_t* native_bridge_ns_;
-};
-
-static constexpr const char kPublicNativeLibrariesSystemConfigPathFromRoot[] =
-    "/etc/public.libraries.txt";
-static constexpr const char kPublicNativeLibrariesExtensionConfigPrefix[] = "public.libraries-";
-static constexpr const size_t kPublicNativeLibrariesExtensionConfigPrefixLen =
-    sizeof(kPublicNativeLibrariesExtensionConfigPrefix) - 1;
-static constexpr const char kPublicNativeLibrariesExtensionConfigSuffix[] = ".txt";
-static constexpr const size_t kPublicNativeLibrariesExtensionConfigSuffixLen =
-    sizeof(kPublicNativeLibrariesExtensionConfigSuffix) - 1;
-static constexpr const char kPublicNativeLibrariesVendorConfig[] =
-    "/vendor/etc/public.libraries.txt";
-static constexpr const char kLlndkNativeLibrariesSystemConfigPathFromRoot[] =
-    "/etc/llndk.libraries.txt";
-static constexpr const char kVndkspNativeLibrariesSystemConfigPathFromRoot[] =
-    "/etc/vndksp.libraries.txt";
-
-static const std::vector<const std::string> kRuntimePublicLibraries = {
-    "libicuuc.so",
-    "libicui18n.so",
-};
-
-// The device may be configured to have the vendor libraries loaded to a separate namespace.
-// For historical reasons this namespace was named sphal but effectively it is intended
-// to use to load vendor libraries to separate namespace with controlled interface between
-// vendor and system namespaces.
-static constexpr const char* kVendorNamespaceName = "sphal";
-
-static constexpr const char* kVndkNamespaceName = "vndk";
-
-static constexpr const char* kDefaultNamespaceName = "default";
-static constexpr const char* kPlatformNamespaceName = "platform";
-static constexpr const char* kRuntimeNamespaceName = "runtime";
-
-// classloader-namespace is a linker namespace that is created for the loaded
-// app. To be specific, it is created for the app classloader. When
-// System.load() is called from a Java class that is loaded from the
-// classloader, the classloader-namespace namespace associated with that
-// classloader is selected for dlopen. The namespace is configured so that its
-// search path is set to the app-local JNI directory and it is linked to the
-// default namespace with the names of libs listed in the public.libraries.txt.
-// This way an app can only load its own JNI libraries along with the public libs.
-static constexpr const char* kClassloaderNamespaceName = "classloader-namespace";
-// Same thing for vendor APKs.
-static constexpr const char* kVendorClassloaderNamespaceName = "vendor-classloader-namespace";
-
-// (http://b/27588281) This is a workaround for apps using custom classloaders and calling
-// System.load() with an absolute path which is outside of the classloader library search path.
-// This list includes all directories app is allowed to access this way.
-static constexpr const char* kWhitelistedDirectories = "/data:/mnt/expand";
-
-static constexpr const char* kApexPath = "/apex/";
-
-#if defined(__LP64__)
-static constexpr const char* kRuntimeApexLibPath = "/apex/com.android.runtime/lib64";
-static constexpr const char* kVendorLibPath = "/vendor/lib64";
-static constexpr const char* kProductLibPath = "/product/lib64:/system/product/lib64";
-#else
-static constexpr const char* kRuntimeApexLibPath = "/apex/com.android.runtime/lib";
-static constexpr const char* kVendorLibPath = "/vendor/lib";
-static constexpr const char* kProductLibPath = "/product/lib:/system/product/lib";
-#endif
-
-static const std::regex kVendorDexPathRegex("(^|:)/vendor/");
-static const std::regex kProductDexPathRegex("(^|:)(/system)?/product/");
-
-// Define origin of APK if it is from vendor partition or product partition
-typedef enum {
-  APK_ORIGIN_DEFAULT = 0,
-  APK_ORIGIN_VENDOR = 1,
-  APK_ORIGIN_PRODUCT = 2,
-} ApkOrigin;
-
-static bool is_debuggable() {
-  bool debuggable = false;
-#ifdef __BIONIC__
-  debuggable = android::base::GetBoolProperty("ro.debuggable", false);
-#endif
-  return debuggable;
+  return nullptr;
 }
-
-static std::string vndk_version_str() {
-#ifdef __BIONIC__
-  std::string version = android::base::GetProperty("ro.vndk.version", "");
-  if (version != "" && version != "current") {
-    return "." + version;
-  }
-#endif
-  return "";
-}
-
-static void insert_vndk_version_str(std::string* file_name) {
-  CHECK(file_name != nullptr);
-  size_t insert_pos = file_name->find_last_of(".");
-  if (insert_pos == std::string::npos) {
-    insert_pos = file_name->length();
-  }
-  file_name->insert(insert_pos, vndk_version_str());
-}
-
-static const std::function<bool(const std::string&, std::string*)> always_true =
-    [](const std::string&, std::string*) { return true; };
-
-class LibraryNamespaces {
- public:
-  LibraryNamespaces() : initialized_(false) { }
-
-  NativeLoaderNamespace* Create(JNIEnv* env, uint32_t target_sdk_version, jobject class_loader,
-                                bool is_shared, jstring dex_path, jstring java_library_path,
-                                jstring java_permitted_path, std::string* error_msg) {
-    std::string library_path; // empty string by default.
-
-    if (java_library_path != nullptr) {
-      ScopedUtfChars library_path_utf_chars(env, java_library_path);
-      library_path = library_path_utf_chars.c_str();
-    }
-
-    ApkOrigin apk_origin = GetApkOriginFromDexPath(env, dex_path);
-
-    // (http://b/27588281) This is a workaround for apps using custom
-    // classloaders and calling System.load() with an absolute path which
-    // is outside of the classloader library search path.
-    //
-    // This part effectively allows such a classloader to access anything
-    // under /data and /mnt/expand
-    std::string permitted_path = kWhitelistedDirectories;
-
-    if (java_permitted_path != nullptr) {
-      ScopedUtfChars path(env, java_permitted_path);
-      if (path.c_str() != nullptr && path.size() > 0) {
-        permitted_path = permitted_path + ":" + path.c_str();
-      }
-    }
-
-    // Initialize the anonymous namespace with the first non-empty library path.
-    if (!library_path.empty() && !initialized_ &&
-        !InitPublicNamespace(library_path.c_str(), error_msg)) {
-      return nullptr;
-    }
-
-    bool found = FindNamespaceByClassLoader(env, class_loader);
-
-    LOG_ALWAYS_FATAL_IF(found,
-                        "There is already a namespace associated with this classloader");
-
-    uint64_t namespace_type = ANDROID_NAMESPACE_TYPE_ISOLATED;
-    if (is_shared) {
-      namespace_type |= ANDROID_NAMESPACE_TYPE_SHARED;
-    }
-
-    if (target_sdk_version < 24) {
-      namespace_type |= ANDROID_NAMESPACE_TYPE_GREYLIST_ENABLED;
-    }
-
-    NativeLoaderNamespace* parent_ns = FindParentNamespaceByClassLoader(env, class_loader);
-
-    bool is_native_bridge = false;
-
-    if (parent_ns != nullptr) {
-      is_native_bridge = !parent_ns->is_android_namespace();
-    } else if (!library_path.empty()) {
-      is_native_bridge = NativeBridgeIsPathSupported(library_path.c_str());
-    }
-
-    std::string system_exposed_libraries = system_public_libraries_;
-    const char* namespace_name = kClassloaderNamespaceName;
-    android_namespace_t* vndk_ns = nullptr;
-    if ((apk_origin == APK_ORIGIN_VENDOR ||
-         (apk_origin == APK_ORIGIN_PRODUCT && target_sdk_version > 29)) &&
-        !is_shared) {
-      LOG_FATAL_IF(is_native_bridge,
-                   "Unbundled vendor / product apk must not use translated architecture");
-
-      // For vendor / product apks, give access to the vendor / product lib even though
-      // they are treated as unbundled; the libs and apks are still bundled
-      // together in the vendor / product partition.
-      const char* origin_partition;
-      const char* origin_lib_path;
-
-      switch (apk_origin) {
-        case APK_ORIGIN_VENDOR:
-          origin_partition = "vendor";
-          origin_lib_path = kVendorLibPath;
-          break;
-        case APK_ORIGIN_PRODUCT:
-          origin_partition = "product";
-          origin_lib_path = kProductLibPath;
-          break;
-        default:
-          origin_partition = "unknown";
-          origin_lib_path = "";
-      }
-
-      LOG_FATAL_IF(is_native_bridge, "Unbundled %s apk must not use translated architecture",
-                   origin_partition);
-
-      library_path = library_path + ":" + origin_lib_path;
-      permitted_path = permitted_path + ":" + origin_lib_path;
-
-      // Also give access to LLNDK libraries since they are available to vendors
-      system_exposed_libraries = system_exposed_libraries + ":" + system_llndk_libraries_.c_str();
-
-      // Give access to VNDK-SP libraries from the 'vndk' namespace.
-      vndk_ns = android_get_exported_namespace(kVndkNamespaceName);
-      if (vndk_ns == nullptr) {
-        ALOGW("Cannot find \"%s\" namespace for %s apks", kVndkNamespaceName, origin_partition);
-      }
-
-      // Different name is useful for debugging
-      namespace_name = kVendorClassloaderNamespaceName;
-      ALOGD("classloader namespace configured for unbundled %s apk. library_path=%s",
-            origin_partition, library_path.c_str());
-    } else {
-      // oem and product public libraries are NOT available to vendor apks, otherwise it
-      // would be system->vendor violation.
-      if (!oem_public_libraries_.empty()) {
-        system_exposed_libraries = system_exposed_libraries + ':' + oem_public_libraries_;
-      }
-      if (!product_public_libraries_.empty()) {
-        system_exposed_libraries = system_exposed_libraries + ':' + product_public_libraries_;
-      }
-    }
-
-    std::string runtime_exposed_libraries = base::Join(kRuntimePublicLibraries, ":");
-
-    NativeLoaderNamespace native_loader_ns;
-    if (!is_native_bridge) {
-      android_namespace_t* android_parent_ns;
-      if (parent_ns != nullptr) {
-        android_parent_ns = parent_ns->get_android_ns();
-      } else {
-        // Fall back to the platform namespace if no parent is found. It is
-        // called "default" for binaries in /system and "platform" for those in
-        // the Runtime APEX. Try "platform" first since "default" always exists.
-        android_parent_ns = android_get_exported_namespace(kPlatformNamespaceName);
-        if (android_parent_ns == nullptr) {
-          android_parent_ns = android_get_exported_namespace(kDefaultNamespaceName);
-        }
-      }
-
-      android_namespace_t* ns = android_create_namespace(namespace_name,
-                                                         nullptr,
-                                                         library_path.c_str(),
-                                                         namespace_type,
-                                                         permitted_path.c_str(),
-                                                         android_parent_ns);
-      if (ns == nullptr) {
-        *error_msg = dlerror();
-        return nullptr;
-      }
-
-      // Note that when vendor_ns is not configured this function will return nullptr
-      // and it will result in linking vendor_public_libraries_ to the default namespace
-      // which is expected behavior in this case.
-      android_namespace_t* vendor_ns = android_get_exported_namespace(kVendorNamespaceName);
-
-      android_namespace_t* runtime_ns = android_get_exported_namespace(kRuntimeNamespaceName);
-
-      if (!android_link_namespaces(ns, nullptr, system_exposed_libraries.c_str())) {
-        *error_msg = dlerror();
-        return nullptr;
-      }
-
-      // Runtime apex does not exist in host, and under certain build conditions.
-      if (runtime_ns != nullptr) {
-        if (!android_link_namespaces(ns, runtime_ns, runtime_exposed_libraries.c_str())) {
-          *error_msg = dlerror();
-          return nullptr;
-        }
-      }
-
-      if (vndk_ns != nullptr && !system_vndksp_libraries_.empty()) {
-        // vendor apks are allowed to use VNDK-SP libraries.
-        if (!android_link_namespaces(ns, vndk_ns, system_vndksp_libraries_.c_str())) {
-          *error_msg = dlerror();
-          return nullptr;
-        }
-      }
-
-      if (!vendor_public_libraries_.empty()) {
-        if (!android_link_namespaces(ns, vendor_ns, vendor_public_libraries_.c_str())) {
-          *error_msg = dlerror();
-          return nullptr;
-        }
-      }
-
-      native_loader_ns = NativeLoaderNamespace(ns);
-    } else {
-      native_bridge_namespace_t* native_bridge_parent_namespace;
-      if (parent_ns != nullptr) {
-        native_bridge_parent_namespace = parent_ns->get_native_bridge_ns();
-      } else {
-        native_bridge_parent_namespace = NativeBridgeGetExportedNamespace(kPlatformNamespaceName);
-        if (native_bridge_parent_namespace == nullptr) {
-          native_bridge_parent_namespace = NativeBridgeGetExportedNamespace(kDefaultNamespaceName);
-        }
-      }
-
-      native_bridge_namespace_t* ns = NativeBridgeCreateNamespace(namespace_name,
-                                                                  nullptr,
-                                                                  library_path.c_str(),
-                                                                  namespace_type,
-                                                                  permitted_path.c_str(),
-                                                                  native_bridge_parent_namespace);
-      if (ns == nullptr) {
-        *error_msg = NativeBridgeGetError();
-        return nullptr;
-      }
-
-      native_bridge_namespace_t* vendor_ns = NativeBridgeGetExportedNamespace(kVendorNamespaceName);
-      native_bridge_namespace_t* runtime_ns =
-          NativeBridgeGetExportedNamespace(kRuntimeNamespaceName);
-
-      if (!NativeBridgeLinkNamespaces(ns, nullptr, system_exposed_libraries.c_str())) {
-        *error_msg = NativeBridgeGetError();
-        return nullptr;
-      }
-
-      // Runtime apex does not exist in host, and under certain build conditions.
-      if (runtime_ns != nullptr) {
-        if (!NativeBridgeLinkNamespaces(ns, runtime_ns, runtime_exposed_libraries.c_str())) {
-          *error_msg = NativeBridgeGetError();
-          return nullptr;
-        }
-      }
-      if (!vendor_public_libraries_.empty()) {
-        if (!NativeBridgeLinkNamespaces(ns, vendor_ns, vendor_public_libraries_.c_str())) {
-          *error_msg = NativeBridgeGetError();
-          return nullptr;
-        }
-      }
-
-      native_loader_ns = NativeLoaderNamespace(ns);
-    }
-
-    namespaces_.push_back(std::make_pair(env->NewWeakGlobalRef(class_loader), native_loader_ns));
-
-    return &(namespaces_.back().second);
-  }
-
-  NativeLoaderNamespace* FindNamespaceByClassLoader(JNIEnv* env, jobject class_loader) {
-    auto it = std::find_if(namespaces_.begin(), namespaces_.end(),
-                [&](const std::pair<jweak, NativeLoaderNamespace>& value) {
-                  return env->IsSameObject(value.first, class_loader);
-                });
-    if (it != namespaces_.end()) {
-      return &it->second;
-    }
-
-    return nullptr;
-  }
-
-  void Initialize() {
-    // Once public namespace is initialized there is no
-    // point in running this code - it will have no effect
-    // on the current list of public libraries.
-    if (initialized_) {
-      return;
-    }
-
-    std::vector<std::string> sonames;
-    const char* android_root_env = getenv("ANDROID_ROOT");
-    std::string root_dir = android_root_env != nullptr ? android_root_env : "/system";
-    std::string public_native_libraries_system_config =
-            root_dir + kPublicNativeLibrariesSystemConfigPathFromRoot;
-    std::string llndk_native_libraries_system_config =
-            root_dir + kLlndkNativeLibrariesSystemConfigPathFromRoot;
-    std::string vndksp_native_libraries_system_config =
-            root_dir + kVndkspNativeLibrariesSystemConfigPathFromRoot;
-
-    std::string product_public_native_libraries_dir = "/product/etc";
-
-    std::string error_msg;
-    LOG_ALWAYS_FATAL_IF(
-        !ReadConfig(public_native_libraries_system_config, &sonames, always_true, &error_msg),
-        "Error reading public native library list from \"%s\": %s",
-        public_native_libraries_system_config.c_str(), error_msg.c_str());
-
-    // For debuggable platform builds use ANDROID_ADDITIONAL_PUBLIC_LIBRARIES environment
-    // variable to add libraries to the list. This is intended for platform tests only.
-    if (is_debuggable()) {
-      const char* additional_libs = getenv("ANDROID_ADDITIONAL_PUBLIC_LIBRARIES");
-      if (additional_libs != nullptr && additional_libs[0] != '\0') {
-        std::vector<std::string> additional_libs_vector = base::Split(additional_libs, ":");
-        std::copy(additional_libs_vector.begin(), additional_libs_vector.end(),
-                  std::back_inserter(sonames));
-      }
-    }
-
-    // Remove the public libs in the runtime namespace.
-    // These libs are listed in public.android.txt, but we don't want the rest of android
-    // in default namespace to dlopen the libs.
-    // For example, libicuuc.so is exposed to classloader namespace from runtime namespace.
-    // Unfortunately, it does not have stable C symbols, and default namespace should only use
-    // stable symbols in libandroidicu.so. http://b/120786417
-    removePublicLibsIfExistsInRuntimeApex(sonames);
-
-    // android_init_namespaces() expects all the public libraries
-    // to be loaded so that they can be found by soname alone.
-    //
-    // TODO(dimitry): this is a bit misleading since we do not know
-    // if the vendor public library is going to be opened from /vendor/lib
-    // we might as well end up loading them from /system/lib or /product/lib
-    // For now we rely on CTS test to catch things like this but
-    // it should probably be addressed in the future.
-    for (const auto& soname : sonames) {
-      LOG_ALWAYS_FATAL_IF(dlopen(soname.c_str(), RTLD_NOW | RTLD_NODELETE) == nullptr,
-                          "Error preloading public library %s: %s", soname.c_str(), dlerror());
-    }
-
-    system_public_libraries_ = base::Join(sonames, ':');
-
-    // read /system/etc/public.libraries-<companyname>.txt which contain partner defined
-    // system libs that are exposed to apps. The libs in the txt files must be
-    // named as lib<name>.<companyname>.so.
-    sonames.clear();
-    ReadExtensionLibraries(base::Dirname(public_native_libraries_system_config).c_str(), &sonames);
-    oem_public_libraries_ = base::Join(sonames, ':');
-
-    // read /product/etc/public.libraries-<companyname>.txt which contain partner defined
-    // product libs that are exposed to apps.
-    sonames.clear();
-    ReadExtensionLibraries(product_public_native_libraries_dir.c_str(), &sonames);
-    product_public_libraries_ = base::Join(sonames, ':');
-
-    // Insert VNDK version to llndk and vndksp config file names.
-    insert_vndk_version_str(&llndk_native_libraries_system_config);
-    insert_vndk_version_str(&vndksp_native_libraries_system_config);
-
-    sonames.clear();
-    ReadConfig(llndk_native_libraries_system_config, &sonames, always_true);
-    system_llndk_libraries_ = base::Join(sonames, ':');
-
-    sonames.clear();
-    ReadConfig(vndksp_native_libraries_system_config, &sonames, always_true);
-    system_vndksp_libraries_ = base::Join(sonames, ':');
-
-    sonames.clear();
-    // This file is optional, quietly ignore if the file does not exist.
-    ReadConfig(kPublicNativeLibrariesVendorConfig, &sonames, always_true, nullptr);
-
-    vendor_public_libraries_ = base::Join(sonames, ':');
-  }
-
-  void Reset() { namespaces_.clear(); }
-
- private:
-  void ReadExtensionLibraries(const char* dirname, std::vector<std::string>* sonames) {
-    std::unique_ptr<DIR, decltype(&closedir)> dir(opendir(dirname), closedir);
-    if (dir != nullptr) {
-      // Failing to opening the dir is not an error, which can happen in
-      // webview_zygote.
-      while (struct dirent* ent = readdir(dir.get())) {
-        if (ent->d_type != DT_REG && ent->d_type != DT_LNK) {
-          continue;
-        }
-        const std::string filename(ent->d_name);
-        if (android::base::StartsWith(filename, kPublicNativeLibrariesExtensionConfigPrefix) &&
-            android::base::EndsWith(filename, kPublicNativeLibrariesExtensionConfigSuffix)) {
-          const size_t start = kPublicNativeLibrariesExtensionConfigPrefixLen;
-          const size_t end = filename.size() - kPublicNativeLibrariesExtensionConfigSuffixLen;
-          const std::string company_name = filename.substr(start, end - start);
-          const std::string config_file_path = dirname + "/"s + filename;
-          LOG_ALWAYS_FATAL_IF(
-              company_name.empty(),
-              "Error extracting company name from public native library list file path \"%s\"",
-              config_file_path.c_str());
-
-          std::string error_msg;
-
-          LOG_ALWAYS_FATAL_IF(
-              !ReadConfig(
-                  config_file_path, sonames,
-                  [&company_name](const std::string& soname, std::string* error_msg) {
-                    if (android::base::StartsWith(soname, "lib") &&
-                        android::base::EndsWith(soname, "." + company_name + ".so")) {
-                      return true;
-                    } else {
-                      *error_msg = "Library name \"" + soname +
-                                   "\" does not end with the company name: " + company_name + ".";
-                      return false;
-                    }
-                  },
-                  &error_msg),
-              "Error reading public native library list from \"%s\": %s", config_file_path.c_str(),
-              error_msg.c_str());
-        }
-      }
-    }
-  }
-
-  /**
-   * Remove the public libs in runtime namespace
-   */
-  void removePublicLibsIfExistsInRuntimeApex(std::vector<std::string>& sonames) {
-    for (const std::string& lib_name : kRuntimePublicLibraries) {
-      std::string path(kRuntimeApexLibPath);
-      path.append("/").append(lib_name);
-
-      struct stat s;
-      // Do nothing if the path in /apex does not exist.
-      // Runtime APEX must be mounted since libnativeloader is in the same APEX
-      if (stat(path.c_str(), &s) != 0) {
-        continue;
-      }
-
-      auto it = std::find(sonames.begin(), sonames.end(), lib_name);
-      if (it != sonames.end()) {
-        sonames.erase(it);
-      }
-    }
-  }
-
-  bool ReadConfig(const std::string& configFile, std::vector<std::string>* sonames,
-                  const std::function<bool(const std::string& /* soname */,
-                                           std::string* /* error_msg */)>& check_soname,
-                  std::string* error_msg = nullptr) {
-    // Read list of public native libraries from the config file.
-    std::string file_content;
-    if(!base::ReadFileToString(configFile, &file_content)) {
-      if (error_msg) *error_msg = strerror(errno);
-      return false;
-    }
-
-    std::vector<std::string> lines = base::Split(file_content, "\n");
-
-    for (auto& line : lines) {
-      auto trimmed_line = base::Trim(line);
-      if (trimmed_line[0] == '#' || trimmed_line.empty()) {
-        continue;
-      }
-      size_t space_pos = trimmed_line.rfind(' ');
-      if (space_pos != std::string::npos) {
-        std::string type = trimmed_line.substr(space_pos + 1);
-        if (type != "32" && type != "64") {
-          if (error_msg) *error_msg = "Malformed line: " + line;
-          return false;
-        }
-#if defined(__LP64__)
-        // Skip 32 bit public library.
-        if (type == "32") {
-          continue;
-        }
-#else
-        // Skip 64 bit public library.
-        if (type == "64") {
-          continue;
-        }
-#endif
-        trimmed_line.resize(space_pos);
-      }
-
-      if (check_soname(trimmed_line, error_msg)) {
-        sonames->push_back(trimmed_line);
-      } else {
-        return false;
-      }
-    }
-
-    return true;
-  }
-
-  bool InitPublicNamespace(const char* library_path, std::string* error_msg) {
-    // Ask native bride if this apps library path should be handled by it
-    bool is_native_bridge = NativeBridgeIsPathSupported(library_path);
-
-    // (http://b/25844435) - Some apps call dlopen from generated code (mono jited
-    // code is one example) unknown to linker in which  case linker uses anonymous
-    // namespace. The second argument specifies the search path for the anonymous
-    // namespace which is the library_path of the classloader.
-    initialized_ = android_init_anonymous_namespace(system_public_libraries_.c_str(),
-                                                    is_native_bridge ? nullptr : library_path);
-    if (!initialized_) {
-      *error_msg = dlerror();
-      return false;
-    }
-
-    // and now initialize native bridge namespaces if necessary.
-    if (NativeBridgeInitialized()) {
-      initialized_ = NativeBridgeInitAnonymousNamespace(system_public_libraries_.c_str(),
-                                                        is_native_bridge ? library_path : nullptr);
-      if (!initialized_) {
-        *error_msg = NativeBridgeGetError();
-      }
-    }
-
-    return initialized_;
-  }
-
-  jobject GetParentClassLoader(JNIEnv* env, jobject class_loader) {
-    jclass class_loader_class = env->FindClass("java/lang/ClassLoader");
-    jmethodID get_parent = env->GetMethodID(class_loader_class,
-                                            "getParent",
-                                            "()Ljava/lang/ClassLoader;");
-
-    return env->CallObjectMethod(class_loader, get_parent);
-  }
-
-  NativeLoaderNamespace* FindParentNamespaceByClassLoader(JNIEnv* env, jobject class_loader) {
-    jobject parent_class_loader = GetParentClassLoader(env, class_loader);
-
-    while (parent_class_loader != nullptr) {
-      NativeLoaderNamespace* ns;
-      if ((ns = FindNamespaceByClassLoader(env, parent_class_loader)) != nullptr) {
-        return ns;
-      }
-
-      parent_class_loader = GetParentClassLoader(env, parent_class_loader);
-    }
-
-    return nullptr;
-  }
-
-  ApkOrigin GetApkOriginFromDexPath(JNIEnv* env, jstring dex_path) {
-    ApkOrigin apk_origin = APK_ORIGIN_DEFAULT;
-
-    if (dex_path != nullptr) {
-      ScopedUtfChars dex_path_utf_chars(env, dex_path);
-
-      if (std::regex_search(dex_path_utf_chars.c_str(), kVendorDexPathRegex)) {
-        apk_origin = APK_ORIGIN_VENDOR;
-      }
-
-      if (std::regex_search(dex_path_utf_chars.c_str(), kProductDexPathRegex)) {
-        LOG_ALWAYS_FATAL_IF(apk_origin == APK_ORIGIN_VENDOR,
-                            "Dex path contains both vendor and product partition : %s",
-                            dex_path_utf_chars.c_str());
-
-        apk_origin = APK_ORIGIN_PRODUCT;
-      }
-    }
-
-    return apk_origin;
-  }
-
-  bool initialized_;
-  std::list<std::pair<jweak, NativeLoaderNamespace>> namespaces_;
-  std::string system_public_libraries_;
-  std::string vendor_public_libraries_;
-  std::string oem_public_libraries_;
-  std::string product_public_libraries_;
-  std::string system_llndk_libraries_;
-  std::string system_vndksp_libraries_;
-
-  DISALLOW_COPY_AND_ASSIGN(LibraryNamespaces);
-};
-
-static std::mutex g_namespaces_mutex;
-static LibraryNamespaces* g_namespaces = new LibraryNamespaces;
-#endif
+#endif  // #if defined(__ANDROID__)
+}  // namespace
 
 void InitializeNativeLoader() {
 #if defined(__ANDROID__)
@@ -769,30 +105,6 @@
   return nullptr;
 }
 
-#if defined(__ANDROID__)
-static android_namespace_t* FindExportedNamespace(const char* caller_location) {
-  std::string location = caller_location;
-  // Lots of implicit assumptions here: we expect `caller_location` to be of the form:
-  // /apex/com.android...modulename/...
-  //
-  // And we extract from it 'modulename', which is the name of the linker namespace.
-  if (android::base::StartsWith(location, kApexPath)) {
-    size_t slash_index = location.find_first_of('/', strlen(kApexPath));
-    LOG_ALWAYS_FATAL_IF((slash_index == std::string::npos),
-                        "Error finding namespace of apex: no slash in path %s", caller_location);
-    size_t dot_index = location.find_last_of('.', slash_index);
-    LOG_ALWAYS_FATAL_IF((dot_index == std::string::npos),
-                        "Error finding namespace of apex: no dot in apex name %s", caller_location);
-    std::string name = location.substr(dot_index + 1, slash_index - dot_index - 1);
-    android_namespace_t* boot_namespace = android_get_exported_namespace(name.c_str());
-    LOG_ALWAYS_FATAL_IF((boot_namespace == nullptr),
-                        "Error finding namespace of apex: no namespace called %s", name.c_str());
-    return boot_namespace;
-  }
-  return nullptr;
-}
-#endif
-
 void* OpenNativeLibrary(JNIEnv* env, int32_t target_sdk_version, const char* path,
                         jobject class_loader, const char* caller_location, jstring library_path,
                         bool* needs_native_bridge, char** error_msg) {
@@ -910,25 +222,12 @@
 #if defined(__ANDROID__)
 void* OpenNativeLibraryInNamespace(NativeLoaderNamespace* ns, const char* path,
                                    bool* needs_native_bridge, char** error_msg) {
-  if (ns->is_android_namespace()) {
-    android_dlextinfo extinfo;
-    extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
-    extinfo.library_namespace = ns->get_android_ns();
-
-    void* handle = android_dlopen_ext(path, RTLD_NOW, &extinfo);
-    if (handle == nullptr) {
-      *error_msg = strdup(dlerror());
-    }
-    *needs_native_bridge = false;
-    return handle;
-  } else {
-    void* handle = NativeBridgeLoadLibraryExt(path, RTLD_NOW, ns->get_native_bridge_ns());
-    if (handle == nullptr) {
-      *error_msg = strdup(NativeBridgeGetError());
-    }
-    *needs_native_bridge = true;
-    return handle;
+  void* handle = ns->Load(path);
+  if (handle == nullptr) {
+    *error_msg = ns->GetError();
   }
+  *needs_native_bridge = ns->IsBridged();
+  return handle;
 }
 
 // native_bridge_namespaces are not supported for callers of this function.
@@ -937,16 +236,16 @@
 android_namespace_t* FindNamespaceByClassLoader(JNIEnv* env, jobject class_loader) {
   std::lock_guard<std::mutex> guard(g_namespaces_mutex);
   NativeLoaderNamespace* ns = g_namespaces->FindNamespaceByClassLoader(env, class_loader);
-  if (ns != nullptr) {
-    return ns->is_android_namespace() ? ns->get_android_ns() : nullptr;
+  if (ns != nullptr && !ns->IsBridged()) {
+    return ns->ToRawAndroidNamespace();
   }
-
   return nullptr;
 }
+
 NativeLoaderNamespace* FindNativeLoaderNamespaceByClassLoader(JNIEnv* env, jobject class_loader) {
   std::lock_guard<std::mutex> guard(g_namespaces_mutex);
   return g_namespaces->FindNamespaceByClassLoader(env, class_loader);
 }
 #endif
 
-}; //  android namespace
+};  // namespace android
diff --git a/libnativeloader/native_loader_namespace.cpp b/libnativeloader/native_loader_namespace.cpp
new file mode 100644
index 0000000..58ac686
--- /dev/null
+++ b/libnativeloader/native_loader_namespace.cpp
@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "nativeloader"
+
+#include "native_loader_namespace.h"
+
+#include <dlfcn.h>
+
+#include <functional>
+
+#include <android-base/strings.h>
+#include <log/log.h>
+#include <nativebridge/native_bridge.h>
+
+#include "nativeloader/dlext_namespaces.h"
+
+namespace android {
+
+namespace {
+
+constexpr const char* kDefaultNamespaceName = "default";
+constexpr const char* kPlatformNamespaceName = "platform";
+
+}  // namespace
+
+NativeLoaderNamespace NativeLoaderNamespace::GetExportedNamespace(const std::string& name,
+                                                                  bool is_bridged) {
+  if (!is_bridged) {
+    return NativeLoaderNamespace(name, android_get_exported_namespace(name.c_str()));
+  } else {
+    return NativeLoaderNamespace(name, NativeBridgeGetExportedNamespace(name.c_str()));
+  }
+}
+
+char* NativeLoaderNamespace::GetError() const {
+  if (!IsBridged()) {
+    return strdup(dlerror());
+  } else {
+    return strdup(NativeBridgeGetError());
+  }
+}
+
+// The platform namespace is called "default" for binaries in /system and
+// "platform" for those in the Runtime APEX. Try "platform" first since
+// "default" always exists.
+NativeLoaderNamespace NativeLoaderNamespace::GetPlatformNamespace(bool is_bridged) {
+  NativeLoaderNamespace ns = GetExportedNamespace(kPlatformNamespaceName, is_bridged);
+  if (ns.IsNil()) {
+    ns = GetExportedNamespace(kDefaultNamespaceName, is_bridged);
+  }
+  return ns;
+}
+
+NativeLoaderNamespace NativeLoaderNamespace::Create(const std::string& name,
+                                                    const std::string& search_paths,
+                                                    const std::string& permitted_paths,
+                                                    const NativeLoaderNamespace* parent,
+                                                    bool is_shared, bool is_greylist_enabled) {
+  bool is_bridged = false;
+  if (parent != nullptr) {
+    is_bridged = parent->IsBridged();
+  } else if (!search_paths.empty()) {
+    is_bridged = NativeBridgeIsPathSupported(search_paths.c_str());
+  }
+
+  // Fall back to the platform namespace if no parent is set.
+  const NativeLoaderNamespace& effective_parent =
+      parent != nullptr ? *parent : GetPlatformNamespace(is_bridged);
+
+  uint64_t type = ANDROID_NAMESPACE_TYPE_ISOLATED;
+  if (is_shared) {
+    type |= ANDROID_NAMESPACE_TYPE_SHARED;
+  }
+  if (is_greylist_enabled) {
+    type |= ANDROID_NAMESPACE_TYPE_GREYLIST_ENABLED;
+  }
+
+  if (!is_bridged) {
+    android_namespace_t* raw =
+        android_create_namespace(name.c_str(), nullptr, search_paths.c_str(), type,
+                                 permitted_paths.c_str(), effective_parent.ToRawAndroidNamespace());
+    return NativeLoaderNamespace(name, raw);
+  } else {
+    native_bridge_namespace_t* raw = NativeBridgeCreateNamespace(
+        name.c_str(), nullptr, search_paths.c_str(), type, permitted_paths.c_str(),
+        effective_parent.ToRawNativeBridgeNamespace());
+    return NativeLoaderNamespace(name, raw);
+  }
+}
+
+bool NativeLoaderNamespace::Link(const NativeLoaderNamespace& target,
+                                 const std::string& shared_libs) const {
+  LOG_ALWAYS_FATAL_IF(shared_libs.empty(), "empty share lib when linking %s to %s",
+                      this->name().c_str(), target.name().c_str());
+  if (!IsBridged()) {
+    return android_link_namespaces(this->ToRawAndroidNamespace(), target.ToRawAndroidNamespace(),
+                                   shared_libs.c_str());
+  } else {
+    return NativeBridgeLinkNamespaces(this->ToRawNativeBridgeNamespace(),
+                                      target.ToRawNativeBridgeNamespace(), shared_libs.c_str());
+  }
+}
+
+void* NativeLoaderNamespace::Load(const char* lib_name) const {
+  if (!IsBridged()) {
+    android_dlextinfo extinfo;
+    extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
+    extinfo.library_namespace = this->ToRawAndroidNamespace();
+    return android_dlopen_ext(lib_name, RTLD_NOW, &extinfo);
+  } else {
+    return NativeBridgeLoadLibraryExt(lib_name, RTLD_NOW, this->ToRawNativeBridgeNamespace());
+  }
+}
+
+}  // namespace android
diff --git a/libnativeloader/native_loader_namespace.h b/libnativeloader/native_loader_namespace.h
new file mode 100644
index 0000000..71e4247
--- /dev/null
+++ b/libnativeloader/native_loader_namespace.h
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#pragma once
+#if defined(__ANDROID__)
+
+#include <string>
+#include <variant>
+#include <vector>
+
+#include <android-base/logging.h>
+#include <android/dlext.h>
+#include <log/log.h>
+#include <nativebridge/native_bridge.h>
+
+namespace android {
+
+// NativeLoaderNamespace abstracts a linker namespace for the native
+// architecture (ex: arm on arm) or the translated architecture (ex: arm on
+// x86). Instances of this class are managed by LibraryNamespaces object.
+struct NativeLoaderNamespace {
+ public:
+  // TODO(return with errors)
+  static NativeLoaderNamespace Create(const std::string& name, const std::string& search_paths,
+                                      const std::string& permitted_paths,
+                                      const NativeLoaderNamespace* parent, bool is_shared,
+                                      bool is_greylist_enabled);
+
+  NativeLoaderNamespace(NativeLoaderNamespace&&) = default;
+  NativeLoaderNamespace(const NativeLoaderNamespace&) = default;
+  NativeLoaderNamespace& operator=(const NativeLoaderNamespace&) = default;
+
+  android_namespace_t* ToRawAndroidNamespace() const { return std::get<0>(raw_); }
+  native_bridge_namespace_t* ToRawNativeBridgeNamespace() const { return std::get<1>(raw_); }
+
+  std::string name() const { return name_; }
+  bool IsBridged() const { return raw_.index() == 1; }
+  bool IsNil() const {
+    return IsBridged() ? std::get<1>(raw_) == nullptr : std::get<0>(raw_) == nullptr;
+  }
+
+  bool Link(const NativeLoaderNamespace& target, const std::string& shared_libs) const;
+  void* Load(const char* lib_name) const;
+  char* GetError() const;
+
+  static NativeLoaderNamespace GetExportedNamespace(const std::string& name, bool is_bridged);
+  static NativeLoaderNamespace GetPlatformNamespace(bool is_bridged);
+
+ private:
+  explicit NativeLoaderNamespace(const std::string& name, android_namespace_t* ns)
+      : name_(name), raw_(ns) {}
+  explicit NativeLoaderNamespace(const std::string& name, native_bridge_namespace_t* ns)
+      : name_(name), raw_(ns) {}
+
+  std::string name_;
+  std::variant<android_namespace_t*, native_bridge_namespace_t*> raw_;
+};
+
+}  // namespace android
+#endif  // #if defined(__ANDROID__)
diff --git a/libnativeloader/public_libraries.cpp b/libnativeloader/public_libraries.cpp
new file mode 100644
index 0000000..c205eb1
--- /dev/null
+++ b/libnativeloader/public_libraries.cpp
@@ -0,0 +1,302 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "nativeloader"
+
+#include "public_libraries.h"
+
+#include <dirent.h>
+
+#include <algorithm>
+#include <memory>
+
+#include <android-base/file.h>
+#include <android-base/logging.h>
+#include <android-base/properties.h>
+#include <android-base/strings.h>
+#include <log/log.h>
+
+#include "utils.h"
+
+namespace android::nativeloader {
+
+using namespace std::string_literals;
+
+namespace {
+
+constexpr const char* kDefaultPublicLibrariesFile = "/etc/public.libraries.txt";
+constexpr const char* kExtendedPublicLibrariesFilePrefix = "public.libraries-";
+constexpr const char* kExtendedPublicLibrariesFileSuffix = ".txt";
+constexpr const char* kVendorPublicLibrariesFile = "/vendor/etc/public.libraries.txt";
+constexpr const char* kLlndkLibrariesFile = "/system/etc/llndk.libraries.txt";
+constexpr const char* kVndkLibrariesFile = "/system/etc/vndksp.libraries.txt";
+
+const std::vector<const std::string> kRuntimePublicLibraries = {
+    "libicuuc.so",
+    "libicui18n.so",
+};
+
+constexpr const char* kRuntimeApexLibPath = "/apex/com.android.runtime/" LIB;
+
+// TODO(b/130388701): do we need this?
+std::string root_dir() {
+  static const char* android_root_env = getenv("ANDROID_ROOT");
+  return android_root_env != nullptr ? android_root_env : "/system";
+}
+
+bool debuggable() {
+  static bool debuggable = android::base::GetBoolProperty("ro.debuggable", false);
+  return debuggable;
+}
+
+std::string vndk_version_str() {
+  static std::string version = android::base::GetProperty("ro.vndk.version", "");
+  if (version != "" && version != "current") {
+    return "." + version;
+  }
+  return "";
+}
+
+// For debuggable platform builds use ANDROID_ADDITIONAL_PUBLIC_LIBRARIES environment
+// variable to add libraries to the list. This is intended for platform tests only.
+std::string additional_public_libraries() {
+  if (debuggable()) {
+    const char* val = getenv("ANDROID_ADDITIONAL_PUBLIC_LIBRARIES");
+    return val ? val : "";
+  }
+  return "";
+}
+
+void InsertVndkVersionStr(std::string* file_name) {
+  CHECK(file_name != nullptr);
+  size_t insert_pos = file_name->find_last_of(".");
+  if (insert_pos == std::string::npos) {
+    insert_pos = file_name->length();
+  }
+  file_name->insert(insert_pos, vndk_version_str());
+}
+
+const std::function<bool(const std::string&, std::string*)> always_true =
+    [](const std::string&, std::string*) { return true; };
+
+bool ReadConfig(const std::string& configFile, std::vector<std::string>* sonames,
+                const std::function<bool(const std::string& /* soname */,
+                                         std::string* /* error_msg */)>& check_soname,
+                std::string* error_msg = nullptr) {
+  // Read list of public native libraries from the config file.
+  std::string file_content;
+  if (!base::ReadFileToString(configFile, &file_content)) {
+    if (error_msg) *error_msg = strerror(errno);
+    return false;
+  }
+
+  std::vector<std::string> lines = base::Split(file_content, "\n");
+
+  for (auto& line : lines) {
+    auto trimmed_line = base::Trim(line);
+    if (trimmed_line[0] == '#' || trimmed_line.empty()) {
+      continue;
+    }
+    size_t space_pos = trimmed_line.rfind(' ');
+    if (space_pos != std::string::npos) {
+      std::string type = trimmed_line.substr(space_pos + 1);
+      if (type != "32" && type != "64") {
+        if (error_msg) *error_msg = "Malformed line: " + line;
+        return false;
+      }
+#if defined(__LP64__)
+      // Skip 32 bit public library.
+      if (type == "32") {
+        continue;
+      }
+#else
+      // Skip 64 bit public library.
+      if (type == "64") {
+        continue;
+      }
+#endif
+      trimmed_line.resize(space_pos);
+    }
+
+    if (check_soname(trimmed_line, error_msg)) {
+      sonames->push_back(trimmed_line);
+    } else {
+      return false;
+    }
+  }
+  return true;
+}
+
+void ReadExtensionLibraries(const char* dirname, std::vector<std::string>* sonames) {
+  std::unique_ptr<DIR, decltype(&closedir)> dir(opendir(dirname), closedir);
+  if (dir != nullptr) {
+    // Failing to opening the dir is not an error, which can happen in
+    // webview_zygote.
+    while (struct dirent* ent = readdir(dir.get())) {
+      if (ent->d_type != DT_REG && ent->d_type != DT_LNK) {
+        continue;
+      }
+      const std::string filename(ent->d_name);
+      std::string_view fn = filename;
+      if (android::base::ConsumePrefix(&fn, kExtendedPublicLibrariesFilePrefix) &&
+          android::base::ConsumeSuffix(&fn, kExtendedPublicLibrariesFileSuffix)) {
+        const std::string company_name(fn);
+        const std::string config_file_path = dirname + "/"s + filename;
+        LOG_ALWAYS_FATAL_IF(
+            company_name.empty(),
+            "Error extracting company name from public native library list file path \"%s\"",
+            config_file_path.c_str());
+
+        std::string error_msg;
+
+        LOG_ALWAYS_FATAL_IF(
+            !ReadConfig(config_file_path, sonames,
+                        [&company_name](const std::string& soname, std::string* error_msg) {
+                          if (android::base::StartsWith(soname, "lib") &&
+                              android::base::EndsWith(soname, "." + company_name + ".so")) {
+                            return true;
+                          } else {
+                            *error_msg = "Library name \"" + soname +
+                                         "\" does not end with the company name: " + company_name +
+                                         ".";
+                            return false;
+                          }
+                        },
+                        &error_msg),
+            "Error reading public native library list from \"%s\": %s", config_file_path.c_str(),
+            error_msg.c_str());
+      }
+    }
+  }
+}
+
+static std::string InitDefaultPublicLibraries() {
+  std::string config_file = root_dir() + kDefaultPublicLibrariesFile;
+  std::vector<std::string> sonames;
+  std::string error_msg;
+  LOG_ALWAYS_FATAL_IF(!ReadConfig(config_file, &sonames, always_true, &error_msg),
+                      "Error reading public native library list from \"%s\": %s",
+                      config_file.c_str(), error_msg.c_str());
+
+  std::string additional_libs = additional_public_libraries();
+  if (!additional_libs.empty()) {
+    auto vec = base::Split(additional_libs, ":");
+    std::copy(vec.begin(), vec.end(), std::back_inserter(sonames));
+  }
+
+  // Remove the public libs in the runtime namespace.
+  // These libs are listed in public.android.txt, but we don't want the rest of android
+  // in default namespace to dlopen the libs.
+  // For example, libicuuc.so is exposed to classloader namespace from runtime namespace.
+  // Unfortunately, it does not have stable C symbols, and default namespace should only use
+  // stable symbols in libandroidicu.so. http://b/120786417
+  for (const std::string& lib_name : kRuntimePublicLibraries) {
+    std::string path(kRuntimeApexLibPath);
+    path.append("/").append(lib_name);
+
+    struct stat s;
+    // Do nothing if the path in /apex does not exist.
+    // Runtime APEX must be mounted since libnativeloader is in the same APEX
+    if (stat(path.c_str(), &s) != 0) {
+      continue;
+    }
+
+    auto it = std::find(sonames.begin(), sonames.end(), lib_name);
+    if (it != sonames.end()) {
+      sonames.erase(it);
+    }
+  }
+  return android::base::Join(sonames, ':');
+}
+
+static std::string InitRuntimePublicLibraries() {
+  CHECK(sizeof(kRuntimePublicLibraries) > 0);
+  std::string list = android::base::Join(kRuntimePublicLibraries, ":");
+
+  std::string additional_libs = additional_public_libraries();
+  if (!additional_libs.empty()) {
+    list = list + ':' + additional_libs;
+  }
+  return list;
+}
+
+static std::string InitVendorPublicLibraries() {
+  // This file is optional, quietly ignore if the file does not exist.
+  std::vector<std::string> sonames;
+  ReadConfig(kVendorPublicLibrariesFile, &sonames, always_true, nullptr);
+  return android::base::Join(sonames, ':');
+}
+
+// read /system/etc/public.libraries-<companyname>.txt and
+// /product/etc/public.libraries-<companyname>.txt which contain partner defined
+// system libs that are exposed to apps. The libs in the txt files must be
+// named as lib<name>.<companyname>.so.
+static std::string InitExtendedPublicLibraries() {
+  std::vector<std::string> sonames;
+  ReadExtensionLibraries("/system/etc", &sonames);
+  ReadExtensionLibraries("/product/etc", &sonames);
+  return android::base::Join(sonames, ':');
+}
+
+static std::string InitLlndkLibraries() {
+  std::string config_file = kLlndkLibrariesFile;
+  InsertVndkVersionStr(&config_file);
+  std::vector<std::string> sonames;
+  ReadConfig(config_file, &sonames, always_true, nullptr);
+  return android::base::Join(sonames, ':');
+}
+
+static std::string InitVndkspLibraries() {
+  std::string config_file = kVndkLibrariesFile;
+  InsertVndkVersionStr(&config_file);
+  std::vector<std::string> sonames;
+  ReadConfig(config_file, &sonames, always_true, nullptr);
+  return android::base::Join(sonames, ':');
+}
+
+}  // namespace
+
+const std::string& default_public_libraries() {
+  static std::string list = InitDefaultPublicLibraries();
+  return list;
+}
+
+const std::string& runtime_public_libraries() {
+  static std::string list = InitRuntimePublicLibraries();
+  return list;
+}
+
+const std::string& vendor_public_libraries() {
+  static std::string list = InitVendorPublicLibraries();
+  return list;
+}
+
+const std::string& extended_public_libraries() {
+  static std::string list = InitExtendedPublicLibraries();
+  return list;
+}
+
+const std::string& llndk_libraries() {
+  static std::string list = InitLlndkLibraries();
+  return list;
+}
+
+const std::string& vndksp_libraries() {
+  static std::string list = InitVndkspLibraries();
+  return list;
+}
+
+}  // namespace android::nativeloader
diff --git a/libnativeloader/public_libraries.h b/libnativeloader/public_libraries.h
new file mode 100644
index 0000000..9b6dea8
--- /dev/null
+++ b/libnativeloader/public_libraries.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#pragma once
+
+#include <string>
+
+namespace android::nativeloader {
+
+// These provide the list of libraries that are available to the namespace for apps.
+// Not all of the libraries are available to apps. Depending on the context,
+// e.g., if it is a vendor app or not, different set of libraries are made available.
+const std::string& default_public_libraries();
+const std::string& runtime_public_libraries();
+const std::string& vendor_public_libraries();
+const std::string& extended_public_libraries();
+const std::string& llndk_libraries();
+const std::string& vndksp_libraries();
+
+};  // namespace android::nativeloader
diff --git a/libnativeloader/utils.h b/libnativeloader/utils.h
new file mode 100644
index 0000000..a1c2be5
--- /dev/null
+++ b/libnativeloader/utils.h
@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#pragma once
+
+namespace android::nativeloader {
+
+#if defined(__LP64__)
+#define LIB "lib64"
+#else
+#define LIB "lib"
+#endif
+
+}  // namespace android::nativeloader
diff --git a/libprocessgroup/Android.bp b/libprocessgroup/Android.bp
index 0207a75..52a297c 100644
--- a/libprocessgroup/Android.bp
+++ b/libprocessgroup/Android.bp
@@ -3,6 +3,7 @@
     vendor_available: true,
     recovery_available: true,
     host_supported: true,
+    native_bridge_supported: true,
     export_include_dirs: ["include"],
     target: {
         linux_bionic: {
@@ -25,6 +26,7 @@
     host_supported: true,
     recovery_available: true,
     vendor_available: true,
+    native_bridge_supported: true,
     vndk: {
         enabled: true,
         support_system_process: true,
diff --git a/libprocessgroup/cgrouprc/Android.bp b/libprocessgroup/cgrouprc/Android.bp
index 9d5afeb..0af75bb 100644
--- a/libprocessgroup/cgrouprc/Android.bp
+++ b/libprocessgroup/cgrouprc/Android.bp
@@ -21,6 +21,7 @@
     // modules should use libprocessgroup which links to the LL-NDK library
     // defined below. The static library is built for tests.
     vendor_available: false,
+    native_bridge_supported: true,
     srcs: [
         "cgroup_controller.cpp",
         "cgroup_file.cpp",
@@ -55,6 +56,7 @@
 llndk_library {
     name: "libcgrouprc",
     symbol_file: "libcgrouprc.llndk.txt",
+    native_bridge_supported: true,
     export_include_dirs: [
         "include",
     ],
diff --git a/libprocessgroup/cgrouprc_format/Android.bp b/libprocessgroup/cgrouprc_format/Android.bp
index dfbeed7..559a869 100644
--- a/libprocessgroup/cgrouprc_format/Android.bp
+++ b/libprocessgroup/cgrouprc_format/Android.bp
@@ -16,6 +16,7 @@
     name: "libcgrouprc_format",
     host_supported: true,
     recovery_available: true,
+    native_bridge_supported: true,
     srcs: [
         "cgroup_controller.cpp",
     ],
diff --git a/libsparse/sparse.cpp b/libsparse/sparse.cpp
index cb288c5..24c6379 100644
--- a/libsparse/sparse.cpp
+++ b/libsparse/sparse.cpp
@@ -188,7 +188,7 @@
                               int (*write)(void* priv, const void* data, size_t len,
                                            unsigned int block, unsigned int nr_blocks),
                               void* priv) {
-  int ret;
+  int ret = 0;
   int chunks;
   struct chunk_data chk;
   struct output_file* out;
diff --git a/libsync/Android.bp b/libsync/Android.bp
index e56f8ba..c996e1b 100644
--- a/libsync/Android.bp
+++ b/libsync/Android.bp
@@ -23,6 +23,7 @@
 cc_library {
     name: "libsync",
     recovery_available: true,
+    native_bridge_supported: true,
     defaults: ["libsync_defaults"],
 }
 
diff --git a/libsystem/Android.bp b/libsystem/Android.bp
index 2e22b43..b265b61 100644
--- a/libsystem/Android.bp
+++ b/libsystem/Android.bp
@@ -3,6 +3,7 @@
     vendor_available: true,
     recovery_available: true,
     host_supported: true,
+    native_bridge_supported: true,
     export_include_dirs: ["include"],
 
     target: {
diff --git a/libsysutils/Android.bp b/libsysutils/Android.bp
index da5d86c..ccda5d1 100644
--- a/libsysutils/Android.bp
+++ b/libsysutils/Android.bp
@@ -26,6 +26,19 @@
     ],
 
     export_include_dirs: ["include"],
+
+    tidy: true,
+    tidy_checks: [
+        "-*",
+        "cert-*",
+        "clang-analyzer-security*",
+        "android-*",
+    ],
+    tidy_checks_as_errors: [
+        "cert-*",
+        "clang-analyzer-security*",
+        "android-*",
+    ],
 }
 
 cc_test {
diff --git a/libsysutils/src/NetlinkEvent.cpp b/libsysutils/src/NetlinkEvent.cpp
index 9dc2699..8fe7854 100644
--- a/libsysutils/src/NetlinkEvent.cpp
+++ b/libsysutils/src/NetlinkEvent.cpp
@@ -39,9 +39,12 @@
 const int LOCAL_QLOG_NL_EVENT = 112;
 const int LOCAL_NFLOG_PACKET = NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET;
 
+#include <android-base/parseint.h>
 #include <log/log.h>
 #include <sysutils/NetlinkEvent.h>
 
+using android::base::ParseInt;
+
 NetlinkEvent::NetlinkEvent() {
     mAction = Action::kUnknown;
     memset(mParams, 0, sizeof(mParams));
@@ -301,8 +304,9 @@
         raw = (char*)nlAttrData(payload);
     }
 
-    char* hex = (char*) calloc(1, 5 + (len * 2));
-    strcpy(hex, "HEX=");
+    size_t hexSize = 5 + (len * 2);
+    char* hex = (char*)calloc(1, hexSize);
+    strlcpy(hex, "HEX=", hexSize);
     for (int i = 0; i < len; i++) {
         hex[4 + (i * 2)] = "0123456789abcdef"[(raw[i] >> 4) & 0xf];
         hex[5 + (i * 2)] = "0123456789abcdef"[raw[i] & 0xf];
@@ -474,23 +478,20 @@
         struct nd_opt_rdnss *rndss_opt = (struct nd_opt_rdnss *) opthdr;
         const uint32_t lifetime = ntohl(rndss_opt->nd_opt_rdnss_lifetime);
 
-        // Construct "SERVERS=<comma-separated string of DNS addresses>".
-        static const char kServerTag[] = "SERVERS=";
-        static const size_t kTagLength = strlen(kServerTag);
+        // Construct a comma-separated string of DNS addresses.
         // Reserve sufficient space for an IPv6 link-local address: all but the
         // last address are followed by ','; the last is followed by '\0'.
         static const size_t kMaxSingleAddressLength =
                 INET6_ADDRSTRLEN + strlen("%") + IFNAMSIZ + strlen(",");
-        const size_t bufsize = kTagLength + numaddrs * kMaxSingleAddressLength;
+        const size_t bufsize = numaddrs * kMaxSingleAddressLength;
         char *buf = (char *) malloc(bufsize);
         if (!buf) {
             SLOGE("RDNSS option: out of memory\n");
             return false;
         }
-        strcpy(buf, kServerTag);
-        size_t pos = kTagLength;
 
         struct in6_addr *addrs = (struct in6_addr *) (rndss_opt + 1);
+        size_t pos = 0;
         for (int i = 0; i < numaddrs; i++) {
             if (i > 0) {
                 buf[pos++] = ',';
@@ -508,7 +509,8 @@
         mSubsystem = strdup("net");
         asprintf(&mParams[0], "INTERFACE=%s", ifname);
         asprintf(&mParams[1], "LIFETIME=%u", lifetime);
-        mParams[2] = buf;
+        asprintf(&mParams[2], "SERVERS=%s", buf);
+        free(buf);
     } else if (opthdr->nd_opt_type == ND_OPT_DNSSL) {
         // TODO: support DNSSL.
     } else {
@@ -634,7 +636,9 @@
                 else if (!strcmp(a, "change"))
                     mAction = Action::kChange;
             } else if ((a = HAS_CONST_PREFIX(s, end, "SEQNUM=")) != nullptr) {
-                mSeq = atoi(a);
+                if (!ParseInt(a, &mSeq)) {
+                    SLOGE("NetlinkEvent::parseAsciiNetlinkMessage: failed to parse SEQNUM=%s", a);
+                }
             } else if ((a = HAS_CONST_PREFIX(s, end, "SUBSYSTEM=")) != nullptr) {
                 mSubsystem = strdup(a);
             } else if (param_idx < NL_PARAMS_MAX) {
diff --git a/libutils/Android.bp b/libutils/Android.bp
index 4f194c7..8be4dd0 100644
--- a/libutils/Android.bp
+++ b/libutils/Android.bp
@@ -17,6 +17,7 @@
     vendor_available: true,
     recovery_available: true,
     host_supported: true,
+    native_bridge_supported: true,
 
     header_libs: [
         "liblog_headers",
@@ -121,6 +122,7 @@
 cc_library {
     name: "libutils",
     defaults: ["libutils_defaults"],
+    native_bridge_supported: true,
 
     srcs: [
         "FileMap.cpp",
diff --git a/libutils/Looper.cpp b/libutils/Looper.cpp
index 2d696eb..14e3e35 100644
--- a/libutils/Looper.cpp
+++ b/libutils/Looper.cpp
@@ -14,7 +14,9 @@
 #define DEBUG_CALLBACKS 0
 
 #include <utils/Looper.h>
+
 #include <sys/eventfd.h>
+#include <cinttypes>
 
 namespace android {
 
diff --git a/libvndksupport/Android.bp b/libvndksupport/Android.bp
index 546c15c..e5b536c 100644
--- a/libvndksupport/Android.bp
+++ b/libvndksupport/Android.bp
@@ -2,6 +2,7 @@
 
 cc_library {
     name: "libvndksupport",
+    native_bridge_supported: true,
     srcs: ["linker.c"],
     cflags: [
         "-Wall",
@@ -22,6 +23,7 @@
 
 llndk_library {
     name: "libvndksupport",
+    native_bridge_supported: true,
     symbol_file: "libvndksupport.map.txt",
     export_include_dirs: ["include"],
 }
diff --git a/libziparchive/Android.bp b/libziparchive/Android.bp
index bc1543b..3843252 100644
--- a/libziparchive/Android.bp
+++ b/libziparchive/Android.bp
@@ -26,6 +26,8 @@
         // Incorrectly warns when C++11 empty brace {} initializer is used.
         // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61489
         "-Wno-missing-field-initializers",
+        "-Wconversion",
+        "-Wno-sign-conversion",
     ],
 
     // Enable -Wold-style-cast only for non-Windows targets.  _islower_l,
@@ -82,6 +84,7 @@
     host_supported: true,
     vendor_available: true,
     recovery_available: true,
+    native_bridge_supported: true,
     vndk: {
         enabled: true,
     },
diff --git a/libziparchive/entry_name_utils-inl.h b/libziparchive/entry_name_utils-inl.h
index 1714586..10311b5 100644
--- a/libziparchive/entry_name_utils-inl.h
+++ b/libziparchive/entry_name_utils-inl.h
@@ -20,9 +20,15 @@
 #include <stddef.h>
 #include <stdint.h>
 
+#include <limits>
+
 // Check if |length| bytes at |entry_name| constitute a valid entry name.
-// Entry names must be valid UTF-8 and must not contain '0'.
+// Entry names must be valid UTF-8 and must not contain '0'. They also must
+// fit into the central directory record.
 inline bool IsValidEntryName(const uint8_t* entry_name, const size_t length) {
+  if (length > std::numeric_limits<uint16_t>::max()) {
+    return false;
+  }
   for (size_t i = 0; i < length; ++i) {
     const uint8_t byte = entry_name[i];
     if (byte == 0) {
@@ -35,7 +41,8 @@
       return false;
     } else {
       // 2-5 byte sequences.
-      for (uint8_t first = (byte & 0x7f) << 1; first & 0x80; first = (first & 0x7f) << 1) {
+      for (uint8_t first = static_cast<uint8_t>((byte & 0x7f) << 1); first & 0x80;
+           first = static_cast<uint8_t>((first & 0x7f) << 1)) {
         ++i;
 
         // Missing continuation byte..
diff --git a/libziparchive/include/ziparchive/zip_archive.h b/libziparchive/include/ziparchive/zip_archive.h
index ab38dfd..7eead7e 100644
--- a/libziparchive/include/ziparchive/zip_archive.h
+++ b/libziparchive/include/ziparchive/zip_archive.h
@@ -25,6 +25,8 @@
 #include <sys/cdefs.h>
 #include <sys/types.h>
 
+#include <string_view>
+
 #include "android-base/off64_t.h"
 
 /* Zip compression methods we support */
@@ -39,10 +41,7 @@
 
   ZipString() {}
 
-  /*
-   * entry_name has to be an c-style string with only ASCII characters.
-   */
-  explicit ZipString(const char* entry_name);
+  explicit ZipString(std::string_view entry_name);
 
   bool operator==(const ZipString& rhs) const {
     return name && (name_length == rhs.name_length) && (memcmp(name, rhs.name, name_length) == 0);
@@ -149,8 +148,7 @@
 void CloseArchive(ZipArchiveHandle archive);
 
 /*
- * Find an entry in the Zip archive, by name. |entryName| must be a null
- * terminated string, and |data| must point to a writeable memory location.
+ * Find an entry in the Zip archive, by name. |data| must be non-null.
  *
  * Returns 0 if an entry is found, and populates |data| with information
  * about this entry. Returns negative values otherwise.
@@ -164,7 +162,7 @@
  * On non-Windows platforms this method does not modify internal state and
  * can be called concurrently.
  */
-int32_t FindEntry(const ZipArchiveHandle archive, const ZipString& entryName, ZipEntry* data);
+int32_t FindEntry(const ZipArchiveHandle archive, const std::string_view entryName, ZipEntry* data);
 
 /*
  * Start iterating over all entries of a zip file. The order of iteration
@@ -180,6 +178,10 @@
  * Returns 0 on success and negative values on failure.
  */
 int32_t StartIteration(ZipArchiveHandle archive, void** cookie_ptr,
+                       const std::string_view optional_prefix = "",
+                       const std::string_view optional_suffix = "");
+// TODO: remove this.
+int32_t StartIteration(ZipArchiveHandle archive, void** cookie_ptr,
                        const ZipString* optional_prefix, const ZipString* optional_suffix);
 
 /*
diff --git a/libziparchive/include/ziparchive/zip_writer.h b/libziparchive/include/ziparchive/zip_writer.h
index f6c8427..bd44fdb 100644
--- a/libziparchive/include/ziparchive/zip_writer.h
+++ b/libziparchive/include/ziparchive/zip_writer.h
@@ -76,7 +76,7 @@
     uint32_t uncompressed_size;
     uint16_t last_mod_time;
     uint16_t last_mod_date;
-    uint32_t padding_length;
+    uint16_t padding_length;
     off64_t local_file_header_offset;
   };
 
@@ -161,8 +161,8 @@
 
   int32_t HandleError(int32_t error_code);
   int32_t PrepareDeflate();
-  int32_t StoreBytes(FileEntry* file, const void* data, size_t len);
-  int32_t CompressBytes(FileEntry* file, const void* data, size_t len);
+  int32_t StoreBytes(FileEntry* file, const void* data, uint32_t len);
+  int32_t CompressBytes(FileEntry* file, const void* data, uint32_t len);
   int32_t FlushCompressedBytes(FileEntry* file);
 
   enum class State {
diff --git a/libziparchive/unzip.cpp b/libziparchive/unzip.cpp
index 6756007..3a3a694 100644
--- a/libziparchive/unzip.cpp
+++ b/libziparchive/unzip.cpp
@@ -17,6 +17,7 @@
 #include <errno.h>
 #include <error.h>
 #include <fcntl.h>
+#include <fnmatch.h>
 #include <getopt.h>
 #include <inttypes.h>
 #include <stdio.h>
@@ -52,9 +53,21 @@
 static uint64_t total_compressed_length = 0;
 static size_t file_count = 0;
 
-static bool Filter(const std::string& name) {
-  if (!excludes.empty() && excludes.find(name) != excludes.end()) return true;
-  if (!includes.empty() && includes.find(name) == includes.end()) return true;
+static bool ShouldInclude(const std::string& name) {
+  // Explicitly excluded?
+  if (!excludes.empty()) {
+    for (const auto& exclude : excludes) {
+      if (!fnmatch(exclude.c_str(), name.c_str(), 0)) return false;
+    }
+  }
+
+  // Implicitly included?
+  if (includes.empty()) return true;
+
+  // Explicitly included?
+  for (const auto& include : includes) {
+    if (!fnmatch(include.c_str(), name.c_str(), 0)) return true;
+  }
   return false;
 }
 
@@ -72,7 +85,7 @@
 
 static int CompressionRatio(int64_t uncompressed, int64_t compressed) {
   if (uncompressed == 0) return 0;
-  return (100LL * (uncompressed - compressed)) / uncompressed;
+  return static_cast<int>((100LL * (uncompressed - compressed)) / uncompressed);
 }
 
 static void MaybeShowHeader() {
@@ -236,7 +249,7 @@
   // libziparchive iteration order doesn't match the central directory.
   // We could sort, but that would cost extra and wouldn't match either.
   void* cookie;
-  int err = StartIteration(zah, &cookie, nullptr, nullptr);
+  int err = StartIteration(zah, &cookie);
   if (err != 0) {
     error(1, 0, "couldn't iterate %s: %s", archive_name, ErrorCodeString(err));
   }
@@ -245,7 +258,7 @@
   ZipString string;
   while ((err = Next(cookie, &entry, &string)) >= 0) {
     std::string name(string.name, string.name + string.name_length);
-    if (!Filter(name)) ProcessOne(zah, entry, name);
+    if (ShouldInclude(name)) ProcessOne(zah, entry, name);
   }
 
   if (err < -1) error(1, 0, "failed iterating %s: %s", archive_name, ErrorCodeString(err));
@@ -260,7 +273,8 @@
 
   printf(
       "\n"
-      "Extract FILEs from ZIP archive. Default is all files.\n"
+      "Extract FILEs from ZIP archive. Default is all files. Both the include and\n"
+      "exclude (-x) lists use shell glob patterns.\n"
       "\n"
       "-d DIR	Extract into DIR\n"
       "-l	List contents (-lq excludes archive name, -lv is verbose)\n"
diff --git a/libziparchive/zip_archive.cc b/libziparchive/zip_archive.cc
index 0710d0a..ac3e236 100644
--- a/libziparchive/zip_archive.cc
+++ b/libziparchive/zip_archive.cc
@@ -102,21 +102,8 @@
 }
 
 static uint32_t ComputeHash(const ZipString& name) {
-#if !defined(_WIN32)
-  return std::hash<std::string_view>{}(
-      std::string_view(reinterpret_cast<const char*>(name.name), name.name_length));
-#else
-  // Remove this code path once the windows compiler knows how to compile the above statement.
-  uint32_t hash = 0;
-  uint16_t len = name.name_length;
-  const uint8_t* str = name.name;
-
-  while (len--) {
-    hash = hash * 31 + *str++;
-  }
-
-  return hash;
-#endif
+  return static_cast<uint32_t>(std::hash<std::string_view>{}(
+      std::string_view(reinterpret_cast<const char*>(name.name), name.name_length)));
 }
 
 static bool isZipStringEqual(const uint8_t* start, const ZipString& zip_string,
@@ -159,7 +146,7 @@
 /*
  * Add a new entry to the hash table.
  */
-static int32_t AddToHash(ZipStringOffset* hash_table, const uint64_t hash_table_size,
+static int32_t AddToHash(ZipStringOffset* hash_table, const uint32_t hash_table_size,
                          const ZipString& name, const uint8_t* start) {
   const uint64_t hash = ComputeHash(name);
   uint32_t ent = hash & (hash_table_size - 1);
@@ -227,7 +214,7 @@
 }
 
 static int32_t MapCentralDirectory0(const char* debug_file_name, ZipArchive* archive,
-                                    off64_t file_length, off64_t read_amount,
+                                    off64_t file_length, uint32_t read_amount,
                                     uint8_t* scan_buffer) {
   const off64_t search_start = file_length - read_amount;
 
@@ -243,7 +230,8 @@
    * doing an initial minimal read; if we don't find it, retry with a
    * second read as above.)
    */
-  int i = read_amount - sizeof(EocdRecord);
+  CHECK_LE(read_amount, std::numeric_limits<int32_t>::max());
+  int32_t i = read_amount - sizeof(EocdRecord);
   for (; i >= 0; i--) {
     if (scan_buffer[i] == 0x50) {
       uint32_t* sig_addr = reinterpret_cast<uint32_t*>(&scan_buffer[i]);
@@ -346,9 +334,9 @@
    *
    * We start by pulling in the last part of the file.
    */
-  off64_t read_amount = kMaxEOCDSearch;
+  uint32_t read_amount = kMaxEOCDSearch;
   if (file_length < read_amount) {
-    read_amount = file_length;
+    read_amount = static_cast<uint32_t>(file_length);
   }
 
   std::vector<uint8_t> scan_buffer(read_amount);
@@ -545,7 +533,7 @@
   return 0;
 }
 
-static int32_t FindEntry(const ZipArchive* archive, const int ent, ZipEntry* data) {
+static int32_t FindEntry(const ZipArchive* archive, const int32_t ent, ZipEntry* data) {
   const uint16_t nameLen = archive->hash_table[ent].name_length;
 
   // Recover the start of the central directory entry from the filename
@@ -701,72 +689,78 @@
 }
 
 struct IterationHandle {
-  uint32_t position;
-  // We're not using vector here because this code is used in the Windows SDK
-  // where the STL is not available.
-  ZipString prefix;
-  ZipString suffix;
   ZipArchive* archive;
 
-  IterationHandle(const ZipString* in_prefix, const ZipString* in_suffix) {
-    if (in_prefix) {
-      uint8_t* name_copy = new uint8_t[in_prefix->name_length];
-      memcpy(name_copy, in_prefix->name, in_prefix->name_length);
-      prefix.name = name_copy;
-      prefix.name_length = in_prefix->name_length;
-    } else {
-      prefix.name = NULL;
-      prefix.name_length = 0;
-    }
-    if (in_suffix) {
-      uint8_t* name_copy = new uint8_t[in_suffix->name_length];
-      memcpy(name_copy, in_suffix->name, in_suffix->name_length);
-      suffix.name = name_copy;
-      suffix.name_length = in_suffix->name_length;
-    } else {
-      suffix.name = NULL;
-      suffix.name_length = 0;
-    }
-  }
+  std::string prefix_holder;
+  ZipString prefix;
 
-  ~IterationHandle() {
-    delete[] prefix.name;
-    delete[] suffix.name;
-  }
+  std::string suffix_holder;
+  ZipString suffix;
+
+  uint32_t position = 0;
+
+  IterationHandle(ZipArchive* archive, const std::string_view in_prefix,
+                  const std::string_view in_suffix)
+      : archive(archive),
+        prefix_holder(in_prefix),
+        prefix(prefix_holder),
+        suffix_holder(in_suffix),
+        suffix(suffix_holder) {}
 };
 
 int32_t StartIteration(ZipArchiveHandle archive, void** cookie_ptr,
-                       const ZipString* optional_prefix, const ZipString* optional_suffix) {
+                       const std::string_view optional_prefix,
+                       const std::string_view optional_suffix) {
   if (archive == NULL || archive->hash_table == NULL) {
     ALOGW("Zip: Invalid ZipArchiveHandle");
     return kInvalidHandle;
   }
 
-  IterationHandle* cookie = new IterationHandle(optional_prefix, optional_suffix);
-  cookie->position = 0;
-  cookie->archive = archive;
+  if (optional_prefix.size() > static_cast<size_t>(UINT16_MAX) ||
+      optional_suffix.size() > static_cast<size_t>(UINT16_MAX)) {
+    ALOGW("Zip: prefix/suffix too long");
+    return kInvalidEntryName;
+  }
 
-  *cookie_ptr = cookie;
+  *cookie_ptr = new IterationHandle(archive, optional_prefix, optional_suffix);
   return 0;
 }
 
+// TODO: remove this.
+int32_t StartIteration(ZipArchiveHandle archive, void** cookie_ptr,
+                       const ZipString* optional_prefix, const ZipString* optional_suffix) {
+  std::string prefix;
+  if (optional_prefix) {
+    prefix = std::string(reinterpret_cast<const char*>(optional_prefix->name),
+                         optional_prefix->name_length);
+  }
+  std::string suffix;
+  if (optional_suffix) {
+    suffix = std::string(reinterpret_cast<const char*>(optional_suffix->name),
+                         optional_suffix->name_length);
+  }
+  return StartIteration(archive, cookie_ptr, prefix.c_str(), suffix.c_str());
+}
+
 void EndIteration(void* cookie) {
   delete reinterpret_cast<IterationHandle*>(cookie);
 }
 
-int32_t FindEntry(const ZipArchiveHandle archive, const ZipString& entryName, ZipEntry* data) {
-  if (entryName.name_length == 0) {
-    ALOGW("Zip: Invalid filename %.*s", entryName.name_length, entryName.name);
+int32_t FindEntry(const ZipArchiveHandle archive, const std::string_view entryName,
+                  ZipEntry* data) {
+  if (entryName.empty() || entryName.size() > static_cast<size_t>(UINT16_MAX)) {
+    ALOGW("Zip: Invalid filename of length %zu", entryName.size());
     return kInvalidEntryName;
   }
 
-  const int64_t ent = EntryToIndex(archive->hash_table, archive->hash_table_size, entryName,
-                                   archive->central_directory.GetBasePtr());
+  const int64_t ent = EntryToIndex(archive->hash_table, archive->hash_table_size,
+                                   ZipString(entryName), archive->central_directory.GetBasePtr());
   if (ent < 0) {
-    ALOGV("Zip: Could not find entry %.*s", entryName.name_length, entryName.name);
-    return ent;
+    ALOGV("Zip: Could not find entry %.*s", static_cast<int>(entryName.size()), entryName.data());
+    return static_cast<int32_t>(ent);  // kEntryNotFound is safe to truncate.
   }
-  return FindEntry(archive, ent, data);
+  // We know there are at most hash_table_size entries, safe to truncate.
+  return FindEntry(archive, static_cast<uint32_t>(ent), data);
 }
 
 int32_t Next(void* cookie, ZipEntry* data, ZipString* name) {
@@ -849,7 +843,6 @@
       return FileWriter{};
     }
 
-    int result = 0;
 #if defined(__linux__)
     if (declared_length > 0) {
       // Make sure we have enough space on the volume to extract the compressed
@@ -861,7 +854,7 @@
       // EOPNOTSUPP error when issued in other filesystems.
       // Hence, check for the return error code before concluding that the
       // disk does not have enough space.
-      result = TEMP_FAILURE_RETRY(fallocate(fd, 0, current_offset, declared_length));
+      long result = TEMP_FAILURE_RETRY(fallocate(fd, 0, current_offset, declared_length));
       if (result == -1 && errno == ENOSPC) {
         ALOGW("Zip: unable to allocate %" PRId64 " bytes at offset %" PRId64 ": %s",
               static_cast<int64_t>(declared_length), static_cast<int64_t>(current_offset),
@@ -879,7 +872,7 @@
 
     // Block device doesn't support ftruncate(2).
     if (!S_ISBLK(sb.st_mode)) {
-      result = TEMP_FAILURE_RETRY(ftruncate(fd, declared_length + current_offset));
+      long result = TEMP_FAILURE_RETRY(ftruncate(fd, declared_length + current_offset));
       if (result == -1) {
         ALOGW("Zip: unable to truncate file to %" PRId64 ": %s",
               static_cast<int64_t>(declared_length + current_offset), strerror(errno));
@@ -998,16 +991,16 @@
   std::unique_ptr<z_stream, decltype(zstream_deleter)> zstream_guard(&zstream, zstream_deleter);
 
   const bool compute_crc = (crc_out != nullptr);
-  uint64_t crc = 0;
+  uLong crc = 0;
   uint32_t remaining_bytes = compressed_length;
   do {
     /* read as much as we can */
     if (zstream.avail_in == 0) {
-      const size_t read_size = (remaining_bytes > kBufSize) ? kBufSize : remaining_bytes;
+      const uint32_t read_size = (remaining_bytes > kBufSize) ? kBufSize : remaining_bytes;
       const uint32_t offset = (compressed_length - remaining_bytes);
       // Make sure to read at offset to ensure concurrent access to the fd.
       if (!reader.ReadAtOffset(read_buf.data(), read_size, offset)) {
-        ALOGW("Zip: inflate read failed, getSize = %zu: %s", read_size, strerror(errno));
+        ALOGW("Zip: inflate read failed, getSize = %u: %s", read_size, strerror(errno));
         return kIoError;
       }
 
@@ -1031,7 +1024,8 @@
       if (!writer->Append(&write_buf[0], write_size)) {
         return kIoError;
       } else if (compute_crc) {
-        crc = crc32(crc, &write_buf[0], write_size);
+        DCHECK_LE(write_size, kBufSize);
+        crc = crc32(crc, &write_buf[0], static_cast<uint32_t>(write_size));
       }
 
       zstream.next_out = &write_buf[0];
@@ -1076,17 +1070,17 @@
 
   const uint32_t length = entry->uncompressed_length;
   uint32_t count = 0;
-  uint64_t crc = 0;
+  uLong crc = 0;
   while (count < length) {
     uint32_t remaining = length - count;
     off64_t offset = entry->offset + count;
 
     // Safe conversion because kBufSize is narrow enough for a 32 bit signed value.
-    const size_t block_size = (remaining > kBufSize) ? kBufSize : remaining;
+    const uint32_t block_size = (remaining > kBufSize) ? kBufSize : remaining;
 
     // Make sure to read at offset to ensure concurrent access to the fd.
     if (!mapped_zip.ReadAtOffset(buf.data(), block_size, offset)) {
-      ALOGW("CopyFileToFile: copy read failed, block_size = %zu, offset = %" PRId64 ": %s",
+      ALOGW("CopyFileToFile: copy read failed, block_size = %u, offset = %" PRId64 ": %s",
             block_size, static_cast<int64_t>(offset), strerror(errno));
       return kIoError;
     }
@@ -1163,8 +1157,9 @@
   return archive->mapped_zip.GetFileDescriptor();
 }
 
-ZipString::ZipString(const char* entry_name) : name(reinterpret_cast<const uint8_t*>(entry_name)) {
-  size_t len = strlen(entry_name);
+ZipString::ZipString(std::string_view entry_name)
+    : name(reinterpret_cast<const uint8_t*>(entry_name.data())) {
+  size_t len = entry_name.size();
   CHECK_LE(len, static_cast<size_t>(UINT16_MAX));
   name_length = static_cast<uint16_t>(len);
 }
diff --git a/libziparchive/zip_archive_benchmark.cpp b/libziparchive/zip_archive_benchmark.cpp
index 46aa5a6..434f2e1 100644
--- a/libziparchive/zip_archive_benchmark.cpp
+++ b/libziparchive/zip_archive_benchmark.cpp
@@ -55,7 +55,7 @@
 
   // In order to walk through all file names in the archive, look for a name
   // that does not exist in the archive.
-  ZipString name("thisFileNameDoesNotExist");
+  std::string_view name("thisFileNameDoesNotExist");
 
   // Start the benchmark.
   while (state.KeepRunning()) {
@@ -75,7 +75,7 @@
 
   while (state.KeepRunning()) {
     OpenArchive(temp_file->path, &handle);
-    StartIteration(handle, &iteration_cookie, nullptr, nullptr);
+    StartIteration(handle, &iteration_cookie);
     while (Next(iteration_cookie, &data, &name) == 0) {
     }
     EndIteration(iteration_cookie);
diff --git a/libziparchive/zip_archive_stream_entry.cc b/libziparchive/zip_archive_stream_entry.cc
index 9ec89b1..1ec95b6 100644
--- a/libziparchive/zip_archive_stream_entry.cc
+++ b/libziparchive/zip_archive_stream_entry.cc
@@ -27,6 +27,7 @@
 #include <vector>
 
 #include <android-base/file.h>
+#include <android-base/logging.h>
 #include <log/log.h>
 
 #include <ziparchive/zip_archive.h>
@@ -77,6 +78,12 @@
 }
 
 const std::vector<uint8_t>* ZipArchiveStreamEntryUncompressed::Read() {
+  // Simple sanity check. The vector should *only* be handled by this code. A caller
+  // should not const-cast and modify the capacity. This may invalidate next_out.
+  //
+  // Note: it would be better to store the results of data() across Read calls.
+  CHECK_EQ(data_.capacity(), kBufSize);
+
   if (length_ == 0) {
     return nullptr;
   }
@@ -97,7 +104,8 @@
   if (bytes < data_.size()) {
     data_.resize(bytes);
   }
-  computed_crc32_ = crc32(computed_crc32_, data_.data(), data_.size());
+  computed_crc32_ = static_cast<uint32_t>(
+      crc32(computed_crc32_, data_.data(), static_cast<uint32_t>(data_.size())));
   length_ -= bytes;
   offset_ += bytes;
   return &data_;
@@ -192,9 +200,15 @@
 }
 
 const std::vector<uint8_t>* ZipArchiveStreamEntryCompressed::Read() {
+  // Simple sanity check. The vector should *only* be handled by this code. A caller
+  // should not const-cast and modify the capacity. This may invalidate next_out.
+  //
+  // Note: it would be better to store the results of data() across Read calls.
+  CHECK_EQ(out_.capacity(), kBufSize);
+
   if (z_stream_.avail_out == 0) {
     z_stream_.next_out = out_.data();
-    z_stream_.avail_out = out_.size();
+    z_stream_.avail_out = static_cast<uint32_t>(out_.size());
     ;
   }
 
@@ -203,7 +217,9 @@
       if (compressed_length_ == 0) {
         return nullptr;
       }
-      size_t bytes = (compressed_length_ > in_.size()) ? in_.size() : compressed_length_;
+      DCHECK_LE(in_.size(), std::numeric_limits<uint32_t>::max());  // Should be buf size = 64k.
+      uint32_t bytes = (compressed_length_ > in_.size()) ? static_cast<uint32_t>(in_.size())
+                                                         : compressed_length_;
       ZipArchive* archive = reinterpret_cast<ZipArchive*>(handle_);
       errno = 0;
       if (!archive->mapped_zip.ReadAtOffset(in_.data(), bytes, offset_)) {
@@ -230,14 +246,16 @@
 
     if (z_stream_.avail_out == 0) {
       uncompressed_length_ -= out_.size();
-      computed_crc32_ = crc32(computed_crc32_, out_.data(), out_.size());
+      computed_crc32_ = static_cast<uint32_t>(
+          crc32(computed_crc32_, out_.data(), static_cast<uint32_t>(out_.size())));
       return &out_;
     }
     if (zerr == Z_STREAM_END) {
       if (z_stream_.avail_out != 0) {
         // Resize the vector down to the actual size of the data.
         out_.resize(out_.size() - z_stream_.avail_out);
-        computed_crc32_ = crc32(computed_crc32_, out_.data(), out_.size());
+        computed_crc32_ = static_cast<uint32_t>(
+            crc32(computed_crc32_, out_.data(), static_cast<uint32_t>(out_.size())));
         uncompressed_length_ -= out_.size();
         return &out_;
       }
diff --git a/libziparchive/zip_archive_test.cc b/libziparchive/zip_archive_test.cc
index cea42d4..993c975 100644
--- a/libziparchive/zip_archive_test.cc
+++ b/libziparchive/zip_archive_test.cc
@@ -27,6 +27,7 @@
 #include <vector>
 
 #include <android-base/file.h>
+#include <android-base/logging.h>
 #include <android-base/mapped_file.h>
 #include <android-base/unique_fd.h>
 #include <gtest/gtest.h>
@@ -63,11 +64,6 @@
   return OpenArchive(abs_path.c_str(), handle);
 }
 
-static void SetZipString(ZipString* zip_str, const std::string& str) {
-  zip_str->name = reinterpret_cast<const uint8_t*>(str.c_str());
-  zip_str->name_length = str.size();
-}
-
 TEST(ziparchive, Open) {
   ZipArchiveHandle handle;
   ASSERT_EQ(0, OpenArchiveWrapper(kValidZip, &handle));
@@ -111,7 +107,7 @@
   close(fd);
 }
 
-static void AssertIterationOrder(const ZipString* prefix, const ZipString* suffix,
+static void AssertIterationOrder(const std::string_view prefix, const std::string_view suffix,
                                  const std::vector<std::string>& expected_names_sorted) {
   ZipArchiveHandle handle;
   ASSERT_EQ(0, OpenArchiveWrapper(kValidZip, &handle));
@@ -141,30 +137,26 @@
   static const std::vector<std::string> kExpectedMatchesSorted = {"a.txt", "b.txt", "b/", "b/c.txt",
                                                                   "b/d.txt"};
 
-  AssertIterationOrder(nullptr, nullptr, kExpectedMatchesSorted);
+  AssertIterationOrder("", "", kExpectedMatchesSorted);
 }
 
 TEST(ziparchive, IterationWithPrefix) {
-  ZipString prefix("b/");
   static const std::vector<std::string> kExpectedMatchesSorted = {"b/", "b/c.txt", "b/d.txt"};
 
-  AssertIterationOrder(&prefix, nullptr, kExpectedMatchesSorted);
+  AssertIterationOrder("b/", "", kExpectedMatchesSorted);
 }
 
 TEST(ziparchive, IterationWithSuffix) {
-  ZipString suffix(".txt");
   static const std::vector<std::string> kExpectedMatchesSorted = {"a.txt", "b.txt", "b/c.txt",
                                                                   "b/d.txt"};
 
-  AssertIterationOrder(nullptr, &suffix, kExpectedMatchesSorted);
+  AssertIterationOrder("", ".txt", kExpectedMatchesSorted);
 }
 
 TEST(ziparchive, IterationWithPrefixAndSuffix) {
-  ZipString prefix("b");
-  ZipString suffix(".txt");
   static const std::vector<std::string> kExpectedMatchesSorted = {"b.txt", "b/c.txt", "b/d.txt"};
 
-  AssertIterationOrder(&prefix, &suffix, kExpectedMatchesSorted);
+  AssertIterationOrder("b", ".txt", kExpectedMatchesSorted);
 }
 
 TEST(ziparchive, IterationWithBadPrefixAndSuffix) {
@@ -172,9 +164,7 @@
   ASSERT_EQ(0, OpenArchiveWrapper(kValidZip, &handle));
 
   void* iteration_cookie;
-  ZipString prefix("x");
-  ZipString suffix("y");
-  ASSERT_EQ(0, StartIteration(handle, &iteration_cookie, &prefix, &suffix));
+  ASSERT_EQ(0, StartIteration(handle, &iteration_cookie, "x", "y"));
 
   ZipEntry data;
   ZipString name;
@@ -190,9 +180,7 @@
   ASSERT_EQ(0, OpenArchiveWrapper(kValidZip, &handle));
 
   ZipEntry data;
-  ZipString name;
-  SetZipString(&name, kATxtName);
-  ASSERT_EQ(0, FindEntry(handle, name, &data));
+  ASSERT_EQ(0, FindEntry(handle, kATxtName, &data));
 
   // Known facts about a.txt, from zipinfo -v.
   ASSERT_EQ(63, data.offset);
@@ -203,9 +191,28 @@
   ASSERT_EQ(static_cast<uint32_t>(0x438a8005), data.mod_time);
 
   // An entry that doesn't exist. Should be a negative return code.
-  ZipString absent_name;
-  SetZipString(&absent_name, kNonexistentTxtName);
-  ASSERT_LT(FindEntry(handle, absent_name, &data), 0);
+  ASSERT_LT(FindEntry(handle, kNonexistentTxtName, &data), 0);
+
+  CloseArchive(handle);
+}
+
+TEST(ziparchive, FindEntry_empty) {
+  ZipArchiveHandle handle;
+  ASSERT_EQ(0, OpenArchiveWrapper(kValidZip, &handle));
+
+  ZipEntry data;
+  ASSERT_EQ(kInvalidEntryName, FindEntry(handle, "", &data));
+
+  CloseArchive(handle);
+}
+
+TEST(ziparchive, FindEntry_too_long) {
+  ZipArchiveHandle handle;
+  ASSERT_EQ(0, OpenArchiveWrapper(kValidZip, &handle));
+
+  std::string very_long_name(65536, 'x');
+  ZipEntry data;
+  ASSERT_EQ(kInvalidEntryName, FindEntry(handle, very_long_name, &data));
 
   CloseArchive(handle);
 }
@@ -215,7 +222,7 @@
   ASSERT_EQ(0, OpenArchiveWrapper("declaredlength.zip", &handle));
 
   void* iteration_cookie;
-  ASSERT_EQ(0, StartIteration(handle, &iteration_cookie, nullptr, nullptr));
+  ASSERT_EQ(0, StartIteration(handle, &iteration_cookie));
 
   ZipString name;
   ZipEntry data;
@@ -232,9 +239,7 @@
 
   // An entry that's deflated.
   ZipEntry data;
-  ZipString a_name;
-  SetZipString(&a_name, kATxtName);
-  ASSERT_EQ(0, FindEntry(handle, a_name, &data));
+  ASSERT_EQ(0, FindEntry(handle, kATxtName, &data));
   const uint32_t a_size = data.uncompressed_length;
   ASSERT_EQ(a_size, kATxtContents.size());
   uint8_t* buffer = new uint8_t[a_size];
@@ -243,9 +248,7 @@
   delete[] buffer;
 
   // An entry that's stored.
-  ZipString b_name;
-  SetZipString(&b_name, kBTxtName);
-  ASSERT_EQ(0, FindEntry(handle, b_name, &data));
+  ASSERT_EQ(0, FindEntry(handle, kBTxtName, &data));
   const uint32_t b_size = data.uncompressed_length;
   ASSERT_EQ(b_size, kBTxtContents.size());
   buffer = new uint8_t[b_size];
@@ -300,9 +303,7 @@
   ASSERT_EQ(0, OpenArchiveFd(tmp_file.fd, "EmptyEntriesTest", &handle, false));
 
   ZipEntry entry;
-  ZipString empty_name;
-  SetZipString(&empty_name, kEmptyTxtName);
-  ASSERT_EQ(0, FindEntry(handle, empty_name, &entry));
+  ASSERT_EQ(0, FindEntry(handle, kEmptyTxtName, &entry));
   ASSERT_EQ(static_cast<uint32_t>(0), entry.uncompressed_length);
   uint8_t buffer[1];
   ASSERT_EQ(0, ExtractToMemory(handle, &entry, buffer, 1));
@@ -325,14 +326,12 @@
   ASSERT_EQ(0, OpenArchiveFd(tmp_file.fd, "EntryLargerThan32KTest", &handle, false));
 
   ZipEntry entry;
-  ZipString ab_name;
-  SetZipString(&ab_name, kAbTxtName);
-  ASSERT_EQ(0, FindEntry(handle, ab_name, &entry));
+  ASSERT_EQ(0, FindEntry(handle, kAbTxtName, &entry));
   ASSERT_EQ(kAbUncompressedSize, entry.uncompressed_length);
 
   // Extract the entry to memory.
   std::vector<uint8_t> buffer(kAbUncompressedSize);
-  ASSERT_EQ(0, ExtractToMemory(handle, &entry, &buffer[0], buffer.size()));
+  ASSERT_EQ(0, ExtractToMemory(handle, &entry, &buffer[0], static_cast<uint32_t>(buffer.size())));
 
   // Extract the entry to a file.
   TemporaryFile tmp_output_file;
@@ -384,9 +383,7 @@
   ASSERT_EQ(0, OpenArchiveWrapper(kValidZip, &handle));
 
   ZipEntry entry;
-  ZipString name;
-  SetZipString(&name, kATxtName);
-  ASSERT_EQ(0, FindEntry(handle, name, &entry));
+  ASSERT_EQ(0, FindEntry(handle, kATxtName, &entry));
   ASSERT_EQ(0, ExtractEntryToFile(handle, &entry, tmp_file.fd));
 
   // Assert that the first 8 bytes of the file haven't been clobbered.
@@ -415,16 +412,15 @@
   ASSERT_EQ(0, fstat(fd, &sb));
 
   // Memory map the file first and open the archive from the memory region.
-  auto file_map{android::base::MappedFile::FromFd(fd, 0, sb.st_size, PROT_READ)};
+  auto file_map{
+      android::base::MappedFile::FromFd(fd, 0, static_cast<size_t>(sb.st_size), PROT_READ)};
   ZipArchiveHandle handle;
   ASSERT_EQ(0,
             OpenArchiveFromMemory(file_map->data(), file_map->size(), zip_path.c_str(), &handle));
 
   // Assert one entry can be found and extracted correctly.
-  std::string BINARY_PATH("META-INF/com/google/android/update-binary");
-  ZipString binary_path(BINARY_PATH.c_str());
   ZipEntry binary_entry;
-  ASSERT_EQ(0, FindEntry(handle, binary_path, &binary_entry));
+  ASSERT_EQ(0, FindEntry(handle, "META-INF/com/google/android/update-binary", &binary_entry));
   TemporaryFile tmp_binary;
   ASSERT_NE(-1, tmp_binary.fd);
   ASSERT_EQ(0, ExtractEntryToFile(handle, &binary_entry, tmp_binary.fd));
@@ -433,9 +429,7 @@
 
 static void ZipArchiveStreamTest(ZipArchiveHandle& handle, const std::string& entry_name, bool raw,
                                  bool verified, ZipEntry* entry, std::vector<uint8_t>* read_data) {
-  ZipString name;
-  SetZipString(&name, entry_name);
-  ASSERT_EQ(0, FindEntry(handle, name, entry));
+  ASSERT_EQ(0, FindEntry(handle, entry_name, entry));
   std::unique_ptr<ZipArchiveStreamEntry> stream;
   if (raw) {
     stream.reset(ZipArchiveStreamEntry::CreateRaw(handle, *entry));
@@ -488,7 +482,8 @@
 
   std::vector<uint8_t> cmp_data(entry.uncompressed_length);
   ASSERT_EQ(entry.uncompressed_length, read_data.size());
-  ASSERT_EQ(0, ExtractToMemory(handle, &entry, cmp_data.data(), cmp_data.size()));
+  ASSERT_EQ(
+      0, ExtractToMemory(handle, &entry, cmp_data.data(), static_cast<uint32_t>(cmp_data.size())));
   ASSERT_TRUE(memcmp(read_data.data(), cmp_data.data(), read_data.size()) == 0);
 
   CloseArchive(handle);
@@ -585,11 +580,7 @@
   // an entry whose name is "name" and whose size is 12 (contents =
   // "abdcdefghijk").
   ZipEntry entry;
-  ZipString name;
-  std::string name_str = "name";
-  SetZipString(&name, name_str);
-
-  ASSERT_EQ(0, FindEntry(handle, name, &entry));
+  ASSERT_EQ(0, FindEntry(handle, "name", &entry));
   ASSERT_EQ(static_cast<uint32_t>(12), entry.uncompressed_length);
 
   entry_out->resize(12);
@@ -737,8 +728,8 @@
 };
 
 TEST(ziparchive, Inflate) {
-  const uint32_t compressed_length = kATxtContentsCompressed.size();
-  const uint32_t uncompressed_length = kATxtContents.size();
+  const uint32_t compressed_length = static_cast<uint32_t>(kATxtContentsCompressed.size());
+  const uint32_t uncompressed_length = static_cast<uint32_t>(kATxtContents.size());
 
   const VectorReader reader(kATxtContentsCompressed);
   {
diff --git a/libziparchive/zip_writer.cc b/libziparchive/zip_writer.cc
index 0df0fa5..ae9d145 100644
--- a/libziparchive/zip_writer.cc
+++ b/libziparchive/zip_writer.cc
@@ -169,8 +169,8 @@
     year = 80;
   }
 
-  *out_date = (year - 80) << 9 | (ptm->tm_mon + 1) << 5 | ptm->tm_mday;
-  *out_time = ptm->tm_hour << 11 | ptm->tm_min << 5 | ptm->tm_sec >> 1;
+  *out_date = static_cast<uint16_t>((year - 80) << 9 | (ptm->tm_mon + 1) << 5 | ptm->tm_mday);
+  *out_time = static_cast<uint16_t>(ptm->tm_hour << 11 | ptm->tm_min << 5 | ptm->tm_sec >> 1);
 }
 
 static void CopyFromFileEntry(const ZipWriter::FileEntry& src, bool use_data_descriptor,
@@ -193,7 +193,8 @@
   dst->compression_method = src.compression_method;
   dst->last_mod_time = src.last_mod_time;
   dst->last_mod_date = src.last_mod_date;
-  dst->file_name_length = src.path.size();
+  DCHECK_LE(src.path.size(), std::numeric_limits<uint16_t>::max());
+  dst->file_name_length = static_cast<uint16_t>(src.path.size());
   dst->extra_field_length = src.padding_length;
 }
 
@@ -203,6 +204,11 @@
     return kInvalidState;
   }
 
+  // Can only have 16535 entries because of zip records.
+  if (files_.size() == std::numeric_limits<uint16_t>::max()) {
+    return HandleError(kIoError);
+  }
+
   if (flags & kAlign32) {
     return kInvalidAlign32Flag;
   }
@@ -210,10 +216,17 @@
   if (powerof2(alignment) == 0) {
     return kInvalidAlignment;
   }
+  if (alignment > std::numeric_limits<uint16_t>::max()) {
+    return kInvalidAlignment;
+  }
 
   FileEntry file_entry = {};
   file_entry.local_file_header_offset = current_offset_;
   file_entry.path = path;
+  // No support for larger than 4GB files.
+  if (file_entry.local_file_header_offset > std::numeric_limits<uint32_t>::max()) {
+    return HandleError(kIoError);
+  }
 
   if (!IsValidEntryName(reinterpret_cast<const uint8_t*>(file_entry.path.data()),
                         file_entry.path.size())) {
@@ -237,7 +250,7 @@
   std::vector<char> zero_padding;
   if (alignment != 0 && (offset & (alignment - 1))) {
     // Pad the extra field so the data will be aligned.
-    uint16_t padding = alignment - (offset % alignment);
+    uint16_t padding = static_cast<uint16_t>(alignment - (offset % alignment));
     file_entry.padding_length = padding;
     offset += padding;
     zero_padding.resize(padding, 0);
@@ -314,7 +327,8 @@
   }
 
   z_stream_->next_out = buffer_.data();
-  z_stream_->avail_out = buffer_.size();
+  DCHECK_EQ(buffer_.size(), kBufSize);
+  z_stream_->avail_out = static_cast<uint32_t>(buffer_.size());
   return kNoError;
 }
 
@@ -322,25 +336,31 @@
   if (state_ != State::kWritingEntry) {
     return HandleError(kInvalidState);
   }
+  // Need to be able to mark down data correctly.
+  if (len + static_cast<uint64_t>(current_file_entry_.uncompressed_size) >
+      std::numeric_limits<uint32_t>::max()) {
+    return HandleError(kIoError);
+  }
+  uint32_t len32 = static_cast<uint32_t>(len);
 
   int32_t result = kNoError;
   if (current_file_entry_.compression_method & kCompressDeflated) {
-    result = CompressBytes(&current_file_entry_, data, len);
+    result = CompressBytes(&current_file_entry_, data, len32);
   } else {
-    result = StoreBytes(&current_file_entry_, data, len);
+    result = StoreBytes(&current_file_entry_, data, len32);
   }
 
   if (result != kNoError) {
     return result;
   }
 
-  current_file_entry_.crc32 =
-      crc32(current_file_entry_.crc32, reinterpret_cast<const Bytef*>(data), len);
-  current_file_entry_.uncompressed_size += len;
+  current_file_entry_.crc32 = static_cast<uint32_t>(
+      crc32(current_file_entry_.crc32, reinterpret_cast<const Bytef*>(data), len32));
+  current_file_entry_.uncompressed_size += len32;
   return kNoError;
 }
 
-int32_t ZipWriter::StoreBytes(FileEntry* file, const void* data, size_t len) {
+int32_t ZipWriter::StoreBytes(FileEntry* file, const void* data, uint32_t len) {
   CHECK(state_ == State::kWritingEntry);
 
   if (fwrite(data, 1, len, file_) != len) {
@@ -351,7 +371,7 @@
   return kNoError;
 }
 
-int32_t ZipWriter::CompressBytes(FileEntry* file, const void* data, size_t len) {
+int32_t ZipWriter::CompressBytes(FileEntry* file, const void* data, uint32_t len) {
   CHECK(state_ == State::kWritingEntry);
   CHECK(z_stream_);
   CHECK(z_stream_->next_out != nullptr);
@@ -379,7 +399,8 @@
 
       // Reset the output buffer for the next input.
       z_stream_->next_out = buffer_.data();
-      z_stream_->avail_out = buffer_.size();
+      DCHECK_EQ(buffer_.size(), kBufSize);
+      z_stream_->avail_out = static_cast<uint32_t>(buffer_.size());
     }
   }
   return kNoError;
@@ -404,7 +425,8 @@
     current_offset_ += write_bytes;
 
     z_stream_->next_out = buffer_.data();
-    z_stream_->avail_out = buffer_.size();
+    DCHECK_EQ(buffer_.size(), kBufSize);
+    z_stream_->avail_out = static_cast<uint32_t>(buffer_.size());
   }
   if (zerr != Z_STREAM_END) {
     return HandleError(kZlibError);
@@ -491,7 +513,11 @@
     cdr.crc32 = file.crc32;
     cdr.compressed_size = file.compressed_size;
     cdr.uncompressed_size = file.uncompressed_size;
-    cdr.file_name_length = file.path.size();
+    // Checked in IsValidEntryName.
+    DCHECK_LE(file.path.size(), std::numeric_limits<uint16_t>::max());
+    cdr.file_name_length = static_cast<uint16_t>(file.path.size());
+    // Checked in StartAlignedEntryWithTime.
+    DCHECK_LE(file.local_file_header_offset, std::numeric_limits<uint32_t>::max());
     cdr.local_file_header_offset = static_cast<uint32_t>(file.local_file_header_offset);
     if (fwrite(&cdr, sizeof(cdr), 1, file_) != 1) {
       return HandleError(kIoError);
@@ -508,10 +534,15 @@
   er.eocd_signature = EocdRecord::kSignature;
   er.disk_num = 0;
   er.cd_start_disk = 0;
-  er.num_records_on_disk = files_.size();
-  er.num_records = files_.size();
-  er.cd_size = current_offset_ - startOfCdr;
-  er.cd_start_offset = startOfCdr;
+  // Checked when adding entries.
+  DCHECK_LE(files_.size(), std::numeric_limits<uint16_t>::max());
+  er.num_records_on_disk = static_cast<uint16_t>(files_.size());
+  er.num_records = static_cast<uint16_t>(files_.size());
+  if (current_offset_ > std::numeric_limits<uint32_t>::max()) {
+    return HandleError(kIoError);
+  }
+  er.cd_size = static_cast<uint32_t>(current_offset_ - startOfCdr);
+  er.cd_start_offset = static_cast<uint32_t>(startOfCdr);
 
   if (fwrite(&er, sizeof(er), 1, file_) != 1) {
     return HandleError(kIoError);
diff --git a/libziparchive/zip_writer_test.cc b/libziparchive/zip_writer_test.cc
index c284273..c3da23c 100644
--- a/libziparchive/zip_writer_test.cc
+++ b/libziparchive/zip_writer_test.cc
@@ -62,7 +62,7 @@
   ASSERT_EQ(0, OpenArchiveFd(fd_, "temp", &handle, false));
 
   ZipEntry data;
-  ASSERT_EQ(0, FindEntry(handle, ZipString("file.txt"), &data));
+  ASSERT_EQ(0, FindEntry(handle, "file.txt", &data));
   EXPECT_EQ(kCompressStored, data.method);
   EXPECT_EQ(0u, data.has_data_descriptor);
   EXPECT_EQ(strlen(expected), data.compressed_length);
@@ -95,19 +95,19 @@
 
   ZipEntry data;
 
-  ASSERT_EQ(0, FindEntry(handle, ZipString("file.txt"), &data));
+  ASSERT_EQ(0, FindEntry(handle, "file.txt", &data));
   EXPECT_EQ(kCompressStored, data.method);
   EXPECT_EQ(2u, data.compressed_length);
   ASSERT_EQ(2u, data.uncompressed_length);
   ASSERT_TRUE(AssertFileEntryContentsEq("he", handle, &data));
 
-  ASSERT_EQ(0, FindEntry(handle, ZipString("file/file.txt"), &data));
+  ASSERT_EQ(0, FindEntry(handle, "file/file.txt", &data));
   EXPECT_EQ(kCompressStored, data.method);
   EXPECT_EQ(3u, data.compressed_length);
   ASSERT_EQ(3u, data.uncompressed_length);
   ASSERT_TRUE(AssertFileEntryContentsEq("llo", handle, &data));
 
-  ASSERT_EQ(0, FindEntry(handle, ZipString("file/file2.txt"), &data));
+  ASSERT_EQ(0, FindEntry(handle, "file/file2.txt", &data));
   EXPECT_EQ(kCompressStored, data.method);
   EXPECT_EQ(0u, data.compressed_length);
   EXPECT_EQ(0u, data.uncompressed_length);
@@ -129,7 +129,7 @@
   ASSERT_EQ(0, OpenArchiveFd(fd_, "temp", &handle, false));
 
   ZipEntry data;
-  ASSERT_EQ(0, FindEntry(handle, ZipString("align.txt"), &data));
+  ASSERT_EQ(0, FindEntry(handle, "align.txt", &data));
   EXPECT_EQ(0, data.offset & 0x03);
 
   CloseArchive(handle);
@@ -163,7 +163,7 @@
   ASSERT_EQ(0, OpenArchiveFd(fd_, "temp", &handle, false));
 
   ZipEntry data;
-  ASSERT_EQ(0, FindEntry(handle, ZipString("align.txt"), &data));
+  ASSERT_EQ(0, FindEntry(handle, "align.txt", &data));
   EXPECT_EQ(0, data.offset & 0x03);
 
   struct tm mod = data.GetModificationTime();
@@ -191,7 +191,7 @@
   ASSERT_EQ(0, OpenArchiveFd(fd_, "temp", &handle, false));
 
   ZipEntry data;
-  ASSERT_EQ(0, FindEntry(handle, ZipString("align.txt"), &data));
+  ASSERT_EQ(0, FindEntry(handle, "align.txt", &data));
   EXPECT_EQ(0, data.offset & 0xfff);
 
   CloseArchive(handle);
@@ -213,7 +213,7 @@
   ASSERT_EQ(0, OpenArchiveFd(fd_, "temp", &handle, false));
 
   ZipEntry data;
-  ASSERT_EQ(0, FindEntry(handle, ZipString("align.txt"), &data));
+  ASSERT_EQ(0, FindEntry(handle, "align.txt", &data));
   EXPECT_EQ(0, data.offset & 0xfff);
 
   struct tm mod = data.GetModificationTime();
@@ -241,7 +241,7 @@
   ASSERT_EQ(0, OpenArchiveFd(fd_, "temp", &handle, false));
 
   ZipEntry data;
-  ASSERT_EQ(0, FindEntry(handle, ZipString("file.txt"), &data));
+  ASSERT_EQ(0, FindEntry(handle, "file.txt", &data));
   EXPECT_EQ(kCompressDeflated, data.method);
   ASSERT_EQ(4u, data.uncompressed_length);
   ASSERT_TRUE(AssertFileEntryContentsEq("helo", handle, &data));
@@ -257,7 +257,7 @@
   std::vector<uint8_t> buffer(kBufSize);
   size_t prev = 1;
   for (size_t i = 0; i < kBufSize; i++) {
-    buffer[i] = i + prev;
+    buffer[i] = static_cast<uint8_t>(i + prev);
     prev = i;
   }
 
@@ -273,13 +273,14 @@
   ASSERT_EQ(0, OpenArchiveFd(fd_, "temp", &handle, false));
 
   ZipEntry data;
-  ASSERT_EQ(0, FindEntry(handle, ZipString("file.txt"), &data));
+  ASSERT_EQ(0, FindEntry(handle, "file.txt", &data));
   EXPECT_EQ(kCompressDeflated, data.method);
   EXPECT_EQ(kBufSize, data.uncompressed_length);
 
   std::vector<uint8_t> decompress(kBufSize);
   memset(decompress.data(), 0, kBufSize);
-  ASSERT_EQ(0, ExtractToMemory(handle, &data, decompress.data(), decompress.size()));
+  ASSERT_EQ(0, ExtractToMemory(handle, &data, decompress.data(),
+                               static_cast<uint32_t>(decompress.size())));
   EXPECT_EQ(0, memcmp(decompress.data(), buffer.data(), kBufSize))
       << "Input buffer and output buffer are different.";
 
@@ -339,12 +340,12 @@
   ASSERT_EQ(0, OpenArchiveFd(fd_, "temp", &handle, false));
 
   ZipEntry data;
-  ASSERT_EQ(0, FindEntry(handle, ZipString("keep.txt"), &data));
+  ASSERT_EQ(0, FindEntry(handle, "keep.txt", &data));
   ASSERT_TRUE(AssertFileEntryContentsEq(kKeepThis, handle, &data));
 
-  ASSERT_NE(0, FindEntry(handle, ZipString("drop.txt"), &data));
+  ASSERT_NE(0, FindEntry(handle, "drop.txt", &data));
 
-  ASSERT_EQ(0, FindEntry(handle, ZipString("replace.txt"), &data));
+  ASSERT_EQ(0, FindEntry(handle, "replace.txt", &data));
   ASSERT_TRUE(AssertFileEntryContentsEq(kReplaceWithThis, handle, &data));
 
   CloseArchive(handle);
@@ -391,7 +392,7 @@
   actual.resize(expected.size());
 
   uint8_t* buffer = reinterpret_cast<uint8_t*>(&*actual.begin());
-  if (ExtractToMemory(handle, zip_entry, buffer, actual.size()) != 0) {
+  if (ExtractToMemory(handle, zip_entry, buffer, static_cast<uint32_t>(actual.size())) != 0) {
     return ::testing::AssertionFailure() << "failed to extract entry";
   }
 
diff --git a/lmkd/lmkd.c b/lmkd/lmkd.c
index 2de7378..48140b8 100644
--- a/lmkd/lmkd.c
+++ b/lmkd/lmkd.c
@@ -189,8 +189,8 @@
 /* vmpressure event handler data */
 static struct event_handler_info vmpressure_hinfo[VMPRESS_LEVEL_COUNT];
 
-/* 3 memory pressure levels, 1 ctrl listen socket, 2 ctrl data socket */
-#define MAX_EPOLL_EVENTS (1 + MAX_DATA_CONN + VMPRESS_LEVEL_COUNT)
+/* 3 memory pressure levels, 1 ctrl listen socket, 2 ctrl data socket, 1 lmk events */
+#define MAX_EPOLL_EVENTS (2 + MAX_DATA_CONN + VMPRESS_LEVEL_COUNT)
 static int epollfd;
 static int maxevents;
 
@@ -1863,6 +1863,74 @@
     return false;
 }
 
+#ifdef LMKD_LOG_STATS
+static int kernel_poll_fd = -1;
+
+static void poll_kernel() {
+    if (kernel_poll_fd == -1) {
+        // not waiting
+        return;
+    }
+
+    while (1) {
+        char rd_buf[256];
+        int bytes_read =
+                TEMP_FAILURE_RETRY(pread(kernel_poll_fd, (void*)rd_buf, sizeof(rd_buf), 0));
+        if (bytes_read <= 0) break;
+        rd_buf[bytes_read] = '\0';
+
+        int64_t pid;
+        int64_t uid;
+        int64_t group_leader_pid;
+        int64_t min_flt;
+        int64_t maj_flt;
+        int64_t rss_in_pages;
+        int16_t oom_score_adj;
+        int16_t min_score_adj;
+        int64_t starttime;
+        char* taskname = 0;
+        int fields_read = sscanf(rd_buf,
+                                 "%" SCNd64 " %" SCNd64 " %" SCNd64 " %" SCNd64 " %" SCNd64
+                                 " %" SCNd64 " %" SCNd16 " %" SCNd16 " %" SCNd64 "\n%m[^\n]",
+                                 &pid, &uid, &group_leader_pid, &min_flt, &maj_flt, &rss_in_pages,
+                                 &oom_score_adj, &min_score_adj, &starttime, &taskname);
+
+        /* only the death of the group leader process is logged */
+        if (fields_read == 10 && group_leader_pid == pid) {
+            int64_t process_start_time_ns = starttime * (NS_PER_SEC / sysconf(_SC_CLK_TCK));
+            stats_write_lmk_kill_occurred(log_ctx, LMK_KILL_OCCURRED, uid, taskname, oom_score_adj,
+                                          min_flt, maj_flt, rss_in_pages * PAGE_SIZE, 0, 0,
+                                          process_start_time_ns, min_score_adj);
+        }
+
+        free(taskname);
+    }
+}
+
+static struct event_handler_info kernel_poll_hinfo = {0, poll_kernel};
+
+static void init_poll_kernel() {
+    struct epoll_event epev;
+    kernel_poll_fd =
+            TEMP_FAILURE_RETRY(open("/proc/lowmemorykiller", O_RDONLY | O_NONBLOCK | O_CLOEXEC));
+
+    if (kernel_poll_fd < 0) {
+        ALOGE("kernel lmk event file could not be opened; errno=%d", kernel_poll_fd);
+        return;
+    }
+
+    epev.events = EPOLLIN;
+    epev.data.ptr = (void*)&kernel_poll_hinfo;
+    if (epoll_ctl(epollfd, EPOLL_CTL_ADD, kernel_poll_fd, &epev) != 0) {
+        ALOGE("epoll_ctl for lmk events failed; errno=%d", errno);
+        close(kernel_poll_fd);
+        kernel_poll_fd = -1;
+    } else {
+        maxevents++;
+    }
+}
+#endif
+
 static int init(void) {
     struct epoll_event epev;
     int i;
@@ -1910,6 +1978,11 @@
 
     if (use_inkernel_interface) {
         ALOGI("Using in-kernel low memory killer interface");
+#ifdef LMKD_LOG_STATS
+        if (enable_stats_log) {
+            init_poll_kernel();
+        }
+#endif
     } else {
         /* Try to use psi monitor first if kernel has it */
         use_psi_monitors = property_get_bool("ro.lmk.use_psi", true) &&
diff --git a/logd/LogAudit.cpp b/logd/LogAudit.cpp
index a21555c..5a375ec 100644
--- a/logd/LogAudit.cpp
+++ b/logd/LogAudit.cpp
@@ -229,70 +229,17 @@
         static const char log_warning[] = { KMSG_PRIORITY(LOG_WARNING) };
         static const char newline[] = "\n";
 
-        // Dedupe messages, checking for identical messages starting with avc:
-        static unsigned count;
-        static char* last_str;
-        static bool last_info;
+        auditParse(str, uid, &denial_metadata);
+        iov[0].iov_base = info ? const_cast<char*>(log_info) : const_cast<char*>(log_warning);
+        iov[0].iov_len = info ? sizeof(log_info) : sizeof(log_warning);
+        iov[1].iov_base = str;
+        iov[1].iov_len = strlen(str);
+        iov[2].iov_base = const_cast<char*>(denial_metadata.c_str());
+        iov[2].iov_len = denial_metadata.length();
+        iov[3].iov_base = const_cast<char*>(newline);
+        iov[3].iov_len = strlen(newline);
 
-        if (last_str != nullptr) {
-            static const char avc[] = "): avc: ";
-            char* avcl = strstr(last_str, avc);
-            bool skip = false;
-
-            if (avcl) {
-                char* avcr = strstr(str, avc);
-
-                skip = avcr &&
-                       !fastcmp<strcmp>(avcl + strlen(avc), avcr + strlen(avc));
-                if (skip) {
-                    ++count;
-                    free(last_str);
-                    last_str = strdup(str);
-                    last_info = info;
-                }
-            }
-            if (!skip) {
-                static const char resume[] = " duplicate messages suppressed\n";
-                iov[0].iov_base = last_info ? const_cast<char*>(log_info)
-                                            : const_cast<char*>(log_warning);
-                iov[0].iov_len =
-                    last_info ? sizeof(log_info) : sizeof(log_warning);
-                iov[1].iov_base = last_str;
-                iov[1].iov_len = strlen(last_str);
-                iov[2].iov_base = const_cast<char*>(denial_metadata.c_str());
-                iov[2].iov_len = denial_metadata.length();
-                if (count > 1) {
-                    iov[3].iov_base = const_cast<char*>(resume);
-                    iov[3].iov_len = strlen(resume);
-                } else {
-                    iov[3].iov_base = const_cast<char*>(newline);
-                    iov[3].iov_len = strlen(newline);
-                }
-
-                writev(fdDmesg, iov, arraysize(iov));
-                free(last_str);
-                last_str = nullptr;
-            }
-        }
-        if (last_str == nullptr) {
-            count = 0;
-            last_str = strdup(str);
-            last_info = info;
-        }
-        if (count == 0) {
-            auditParse(str, uid, &denial_metadata);
-            iov[0].iov_base = info ? const_cast<char*>(log_info)
-                                   : const_cast<char*>(log_warning);
-            iov[0].iov_len = info ? sizeof(log_info) : sizeof(log_warning);
-            iov[1].iov_base = str;
-            iov[1].iov_len = strlen(str);
-            iov[2].iov_base = const_cast<char*>(denial_metadata.c_str());
-            iov[2].iov_len = denial_metadata.length();
-            iov[3].iov_base = const_cast<char*>(newline);
-            iov[3].iov_len = strlen(newline);
-
-            writev(fdDmesg, iov, arraysize(iov));
-        }
+        writev(fdDmesg, iov, arraysize(iov));
     }
 
     if (!main && !events) {
diff --git a/logd/tests/Android.bp b/logd/tests/Android.bp
index 83a194f..d39da8a 100644
--- a/logd/tests/Android.bp
+++ b/logd/tests/Android.bp
@@ -35,12 +35,12 @@
 
     srcs: ["logd_test.cpp"],
 
-    shared_libs: [
+    static_libs: [
         "libbase",
         "libcutils",
         "libselinux",
+        "liblog",
     ],
-    static_libs: ["liblog"],
 }
 
 // Build tests for the logger. Run with:
diff --git a/mkbootimg/mkbootimg.py b/mkbootimg/mkbootimg.py
index 92b11a5..934f28e 100644
--- a/mkbootimg/mkbootimg.py
+++ b/mkbootimg/mkbootimg.py
@@ -113,6 +113,10 @@
         args.output.write(pack('I', BOOT_IMAGE_HEADER_V2_SIZE))
 
     if args.header_version > 1:
+
+        if filesize(args.dtb) == 0:
+            raise ValueError("DTB image must not be empty.")
+
         args.output.write(pack('I', filesize(args.dtb)))   # size in bytes
         args.output.write(pack('Q', args.base + args.dtb_offset)) # dtb physical load address
     pad_file(args.output, args.pagesize)
diff --git a/property_service/libpropertyinfoparser/Android.bp b/property_service/libpropertyinfoparser/Android.bp
index 5c57d69..ac802b5 100644
--- a/property_service/libpropertyinfoparser/Android.bp
+++ b/property_service/libpropertyinfoparser/Android.bp
@@ -3,6 +3,7 @@
     host_supported: true,
     vendor_available: true,
     recovery_available: true,
+    native_bridge_supported: true,
     srcs: ["property_info_parser.cpp"],
 
     cpp_std: "experimental",
diff --git a/property_service/libpropertyinfoserializer/property_info_serializer_test.cpp b/property_service/libpropertyinfoserializer/property_info_serializer_test.cpp
index f484550..33da1f1 100644
--- a/property_service/libpropertyinfoserializer/property_info_serializer_test.cpp
+++ b/property_service/libpropertyinfoserializer/property_info_serializer_test.cpp
@@ -585,6 +585,7 @@
       {"ro.boottime.imsdatadaemon", "u:object_r:boottime_prop:s0"},
       {"ro.boottime.imsqmidaemon", "u:object_r:boottime_prop:s0"},
       {"ro.boottime.init", "u:object_r:boottime_prop:s0"},
+      {"ro.boottime.init.first_stage", "u:object_r:boottime_prop:s0"},
       {"ro.boottime.init.cold_boot_wait", "u:object_r:boottime_prop:s0"},
       {"ro.boottime.init.mount_all.default", "u:object_r:boottime_prop:s0"},
       {"ro.boottime.init.selinux", "u:object_r:boottime_prop:s0"},
diff --git a/rootdir/Android.mk b/rootdir/Android.mk
index 7ff1588..f084cd2 100644
--- a/rootdir/Android.mk
+++ b/rootdir/Android.mk
@@ -89,7 +89,7 @@
 
 EXPORT_GLOBAL_GCOV_OPTIONS :=
 ifeq ($(NATIVE_COVERAGE),true)
-  EXPORT_GLOBAL_GCOV_OPTIONS := export GCOV_PREFIX /data/misc/gcov
+  EXPORT_GLOBAL_GCOV_OPTIONS := export GCOV_PREFIX /data/misc/trace
 endif
 
 # Put it here instead of in init.rc module definition,
@@ -97,7 +97,7 @@
 #
 # create some directories (some are mount points) and symlinks
 LOCAL_POST_INSTALL_CMD := mkdir -p $(addprefix $(TARGET_ROOT_OUT)/, \
-    sbin dev proc sys system data odm oem acct config storage mnt apex debug_ramdisk $(BOARD_ROOT_EXTRA_FOLDERS)); \
+    dev proc sys system data odm oem acct config storage mnt apex debug_ramdisk $(BOARD_ROOT_EXTRA_FOLDERS)); \
     ln -sf /system/bin $(TARGET_ROOT_OUT)/bin; \
     ln -sf /system/etc $(TARGET_ROOT_OUT)/etc; \
     ln -sf /data/user_de/0/com.android.shell/files/bugreports $(TARGET_ROOT_OUT)/bugreports; \
diff --git a/rootdir/etc/ld.config.legacy.txt b/rootdir/etc/ld.config.legacy.txt
index a5db374..f6b5e95 100644
--- a/rootdir/etc/ld.config.legacy.txt
+++ b/rootdir/etc/ld.config.legacy.txt
@@ -20,6 +20,9 @@
 
 [legacy]
 namespace.default.isolated = false
+# Visible to allow links to be created at runtime, e.g. through
+# android_link_namespaces in libnativeloader.
+namespace.default.visible = true
 
 namespace.default.search.paths  = /system/${LIB}
 namespace.default.search.paths += /product/${LIB}
@@ -41,7 +44,7 @@
 
 additional.namespaces = runtime,conscrypt,media,resolv
 
-# Keep in sync with ld.config.txt in the com.android.runtime APEX.
+# Keep in sync with the "platform" namespace in art/build/apex/ld.config.txt.
 # If a shared library or an executable requests a shared library that
 # cannot be loaded into the default namespace, the dynamic linker tries
 # to load the shared library from the runtime namespace. And then, if the
@@ -50,14 +53,15 @@
 # Finally, if all attempts fail, the dynamic linker returns an error.
 namespace.default.links = runtime,resolv
 namespace.default.asan.links = runtime,resolv
-# Visible because some libraries are dlopen'ed, e.g. libopenjdk is dlopen'ed by
-# libart.
-namespace.default.visible = true
-namespace.default.link.runtime.shared_libs  = libdexfile_external.so
+namespace.default.link.runtime.shared_libs  = libandroidicu.so
+namespace.default.link.runtime.shared_libs += libdexfile_external.so
+namespace.default.link.runtime.shared_libs += libdexfiled_external.so
+# libicuuc.so and libicui18n.so are kept for app compat reason. http://b/130788466
+namespace.default.link.runtime.shared_libs += libicui18n.so
+namespace.default.link.runtime.shared_libs += libicuuc.so
 namespace.default.link.runtime.shared_libs += libnativebridge.so
 namespace.default.link.runtime.shared_libs += libnativehelper.so
 namespace.default.link.runtime.shared_libs += libnativeloader.so
-namespace.default.link.runtime.shared_libs += libandroidicu.so
 
 # TODO(b/122876336): Remove libpac.so once it's migrated to Webview
 namespace.default.link.runtime.shared_libs += libpac.so
@@ -71,16 +75,20 @@
 # "runtime" APEX namespace
 #
 # This namespace exposes externally accessible libraries from the Runtime APEX.
+# Keep in sync with the "runtime" namespace in art/build/apex/ld.config.txt.
 ###############################################################################
 namespace.runtime.isolated = true
+# Visible to allow links to be created at runtime, e.g. through
+# android_link_namespaces in libnativeloader.
 namespace.runtime.visible = true
 
-# Keep in sync with ld.config.txt in the com.android.runtime APEX.
 namespace.runtime.search.paths = /apex/com.android.runtime/${LIB}
 namespace.runtime.asan.search.paths = /apex/com.android.runtime/${LIB}
 namespace.runtime.links = default
-# TODO(b/119867084): Restrict to Bionic dlopen dependencies and PALette library
-# when it exists.
+# Need allow_all_shared_libs because libart.so can dlopen oat files in
+# /system/framework and /data.
+# TODO(b/130340935): Use a dynamically created linker namespace similar to
+# classloader-namespace for oat files, and tighten this up.
 namespace.runtime.link.default.allow_all_shared_libs = true
 
 ###############################################################################
@@ -117,11 +125,11 @@
 # "conscrypt" APEX namespace
 #
 # This namespace is for libraries within the conscrypt APEX.
+# Keep in sync with the "conscrypt" namespace in art/build/apex/ld.config.txt.
 ###############################################################################
 namespace.conscrypt.isolated = true
 namespace.conscrypt.visible = true
 
-# Keep in sync with ld.config.txt in the com.android.runtime APEX.
 namespace.conscrypt.search.paths = /apex/com.android.conscrypt/${LIB}
 namespace.conscrypt.asan.search.paths = /apex/com.android.conscrypt/${LIB}
 namespace.conscrypt.links = runtime,default
diff --git a/rootdir/etc/ld.config.txt b/rootdir/etc/ld.config.txt
index 72aaa84..c033d53 100644
--- a/rootdir/etc/ld.config.txt
+++ b/rootdir/etc/ld.config.txt
@@ -43,6 +43,9 @@
 # can't be loaded in this namespace.
 ###############################################################################
 namespace.default.isolated = true
+# Visible to allow links to be created at runtime, e.g. through
+# android_link_namespaces in libnativeloader.
+namespace.default.visible = true
 
 namespace.default.search.paths  = /system/${LIB}
 namespace.default.search.paths += /%PRODUCT%/${LIB}
@@ -121,7 +124,7 @@
 namespace.default.asan.permitted.paths += /apex/com.android.runtime/${LIB}/bionic
 namespace.default.asan.permitted.paths += /system/${LIB}/bootstrap
 
-# Keep in sync with ld.config.txt in the com.android.runtime APEX.
+# Keep in sync with the "platform" namespace in art/build/apex/ld.config.txt.
 # If a shared library or an executable requests a shared library that
 # cannot be loaded into the default namespace, the dynamic linker tries
 # to load the shared library from the runtime namespace. And then, if the
@@ -129,17 +132,19 @@
 # dynamic linker tries to load the shared library from the resolv namespace.
 # Finally, if all attempts fail, the dynamic linker returns an error.
 namespace.default.links = runtime,resolv
-# Visible because some libraries are dlopen'ed, e.g. libopenjdk is dlopen'ed by
-# libart.
-namespace.default.visible = true
-namespace.default.link.runtime.shared_libs  = libdexfile_external.so
+namespace.default.link.runtime.shared_libs  = libandroidicu.so
+namespace.default.link.runtime.shared_libs += libdexfile_external.so
+namespace.default.link.runtime.shared_libs += libdexfiled_external.so
+# libicuuc.so and libicui18n.so are kept for app compat reason. http://b/130788466
+namespace.default.link.runtime.shared_libs += libicui18n.so
+namespace.default.link.runtime.shared_libs += libicuuc.so
 namespace.default.link.runtime.shared_libs += libnativebridge.so
 namespace.default.link.runtime.shared_libs += libnativehelper.so
 namespace.default.link.runtime.shared_libs += libnativeloader.so
-namespace.default.link.runtime.shared_libs += libandroidicu.so
 
 # TODO(b/122876336): Remove libpac.so once it's migrated to Webview
 namespace.default.link.runtime.shared_libs += libpac.so
+namespace.default.link.runtime.shared_libs += %SANITIZER_RUNTIME_LIBRARIES%
 
 # When libnetd_resolv.so can't be found in the default namespace, search for it
 # in the resolv namespace. Don't allow any other libraries from the resolv namespace
@@ -150,16 +155,20 @@
 # "runtime" APEX namespace
 #
 # This namespace exposes externally accessible libraries from the Runtime APEX.
+# Keep in sync with the "runtime" namespace in art/build/apex/ld.config.txt.
 ###############################################################################
 namespace.runtime.isolated = true
+# Visible to allow links to be created at runtime, e.g. through
+# android_link_namespaces in libnativeloader.
 namespace.runtime.visible = true
 
-# Keep in sync with ld.config.txt in the com.android.runtime APEX.
 namespace.runtime.search.paths = /apex/com.android.runtime/${LIB}
 namespace.runtime.asan.search.paths = /apex/com.android.runtime/${LIB}
 namespace.runtime.links = default
-# TODO(b/119867084): Restrict to Bionic dlopen dependencies and PALette library
-# when it exists.
+# Need allow_all_shared_libs because libart.so can dlopen oat files in
+# /system/framework and /data.
+# TODO(b/130340935): Use a dynamically created linker namespace similar to
+# classloader-namespace for oat files, and tighten this up.
 namespace.runtime.link.default.allow_all_shared_libs = true
 
 ###############################################################################
@@ -186,11 +195,11 @@
 # "conscrypt" APEX namespace
 #
 # This namespace is for libraries within the conscrypt APEX.
+# Keep in sync with the "conscrypt" namespace in art/build/apex/ld.config.txt.
 ###############################################################################
 namespace.conscrypt.isolated = true
 namespace.conscrypt.visible = true
 
-# Keep in sync with ld.config.txt in the com.android.runtime APEX.
 namespace.conscrypt.search.paths = /apex/com.android.conscrypt/${LIB}
 namespace.conscrypt.asan.search.paths = /apex/com.android.conscrypt/${LIB}
 namespace.conscrypt.links = runtime,default
@@ -233,6 +242,8 @@
 # Note that there is no link from the default namespace to this namespace.
 ###############################################################################
 namespace.sphal.isolated = true
+# Visible to allow links to be created at runtime, e.g. through
+# android_link_namespaces in libnativeloader.
 namespace.sphal.visible = true
 
 namespace.sphal.search.paths  = /odm/${LIB}
@@ -322,6 +333,8 @@
 # This namespace is exclusively for vndk-sp libs.
 ###############################################################################
 namespace.vndk.isolated = true
+# Visible to allow links to be created at runtime, e.g. through
+# android_link_namespaces in libnativeloader.
 namespace.vndk.visible = true
 
 namespace.vndk.search.paths  = /odm/${LIB}/vndk-sp
@@ -359,7 +372,7 @@
 # The "vndk" namespace links to "default" namespace for LLNDK libs and links to
 # "sphal" namespace for vendor libs.  The ordering matters.  The "default"
 # namespace has higher priority than the "sphal" namespace.
-namespace.vndk.links = default,sphal
+namespace.vndk.links = default,sphal,runtime
 
 # When these NDK libs are required inside this namespace, then it is redirected
 # to the default namespace. This is possible since their ABI is stable across
@@ -367,6 +380,8 @@
 namespace.vndk.link.default.shared_libs  = %LLNDK_LIBRARIES%
 namespace.vndk.link.default.shared_libs += %SANITIZER_RUNTIME_LIBRARIES%
 
+namespace.vndk.link.runtime.shared_libs = %SANITIZER_RUNTIME_LIBRARIES%
+
 # Allow VNDK-SP extensions to use vendor libraries
 namespace.vndk.link.sphal.allow_all_shared_libs = true
 
@@ -419,8 +434,10 @@
 namespace.default.asan.permitted.paths += /data/asan/vendor
 namespace.default.asan.permitted.paths +=           /vendor
 
-namespace.default.links = system,vndk%VNDK_IN_SYSTEM_NS%
-namespace.default.link.system.shared_libs = %LLNDK_LIBRARIES%
+namespace.default.links = system,vndk%VNDK_IN_SYSTEM_NS%,runtime
+namespace.default.link.runtime.shared_libs = %SANITIZER_RUNTIME_LIBRARIES%
+namespace.default.link.system.shared_libs  = %LLNDK_LIBRARIES%
+namespace.default.link.system.shared_libs += %SANITIZER_RUNTIME_LIBRARIES%
 namespace.default.link.vndk_in_system.shared_libs = %VNDK_USING_CORE_VARIANT_LIBRARIES%
 namespace.default.link.vndk.shared_libs  = %VNDK_SAMEPROCESS_LIBRARIES%
 namespace.default.link.vndk.shared_libs += %VNDK_CORE_LIBRARIES%
@@ -429,15 +446,15 @@
 # "runtime" APEX namespace
 #
 # This namespace exposes externally accessible libraries from the Runtime APEX.
+# Keep in sync with the "runtime" namespace in art/build/apex/ld.config.txt.
 ###############################################################################
 namespace.runtime.isolated = true
 
-# Keep in sync with ld.config.txt in the com.android.runtime APEX.
 namespace.runtime.search.paths = /apex/com.android.runtime/${LIB}
 namespace.runtime.asan.search.paths = /apex/com.android.runtime/${LIB}
 namespace.runtime.links = system
-# TODO(b/119867084): Restrict to Bionic dlopen dependencies and PALette library
-# when it exists.
+# TODO(b/130340935): Use a dynamically created linker namespace similar to
+# classloader-namespace for oat files, and tighten this up.
 namespace.runtime.link.system.allow_all_shared_libs = true
 
 ###############################################################################
@@ -473,13 +490,15 @@
 # Android releases.  The links here should be identical to that of the
 # 'vndk_in_system' namespace, except for the link between 'vndk' and
 # 'vndk_in_system'.
-namespace.vndk.links = system,default%VNDK_IN_SYSTEM_NS%
+namespace.vndk.links = system,default%VNDK_IN_SYSTEM_NS%,runtime
 
 namespace.vndk.link.system.shared_libs  = %LLNDK_LIBRARIES%
 namespace.vndk.link.system.shared_libs += %SANITIZER_RUNTIME_LIBRARIES%
 
 namespace.vndk.link.default.allow_all_shared_libs = true
 
+namespace.vndk.link.runtime.shared_libs = %SANITIZER_RUNTIME_LIBRARIES%
+
 namespace.vndk.link.vndk_in_system.shared_libs = %VNDK_USING_CORE_VARIANT_LIBRARIES%
 
 ###############################################################################
@@ -503,11 +522,16 @@
 
 namespace.system.links = runtime
 namespace.system.link.runtime.shared_libs  = libdexfile_external.so
+namespace.system.link.runtime.shared_libs += libdexfiled_external.so
+# libicuuc.so and libicui18n.so are kept for app compat reason. http://b/130788466
+namespace.system.link.runtime.shared_libs += libicui18n.so
+namespace.system.link.runtime.shared_libs += libicuuc.so
 namespace.system.link.runtime.shared_libs += libnativebridge.so
 namespace.system.link.runtime.shared_libs += libnativehelper.so
 namespace.system.link.runtime.shared_libs += libnativeloader.so
 # Workaround for b/124772622
 namespace.system.link.runtime.shared_libs += libandroidicu.so
+namespace.system.link.runtime.shared_libs += %SANITIZER_RUNTIME_LIBRARIES%
 
 ###############################################################################
 # "vndk_in_system" namespace
@@ -546,7 +570,8 @@
 #   1. 'vndk_in_system' needs to be freely linked back to 'vndk'.
 #   2. 'vndk_in_system' does not need to link to 'default', as any library that
 #      requires anything vendor would not be a vndk_in_system library.
-namespace.vndk_in_system.links = vndk,system
+namespace.vndk_in_system.links = vndk,system,runtime
+namespace.vndk_in_system.link.runtime.shared_libs = %SANITIZER_RUNTIME_LIBRARIES%
 
 namespace.vndk_in_system.link.system.shared_libs  = %LLNDK_LIBRARIES%
 namespace.vndk_in_system.link.system.shared_libs += %SANITIZER_RUNTIME_LIBRARIES%
@@ -563,6 +588,10 @@
 [unrestricted]
 additional.namespaces = runtime,media,conscrypt,resolv
 
+# Visible to allow links to be created at runtime, e.g. through
+# android_link_namespaces in libnativeloader.
+namespace.default.visible = true
+
 namespace.default.search.paths  = /system/${LIB}
 namespace.default.search.paths += /odm/${LIB}
 namespace.default.search.paths += /vendor/${LIB}
@@ -574,15 +603,17 @@
 namespace.default.asan.search.paths += /data/asan/vendor/${LIB}
 namespace.default.asan.search.paths +=           /vendor/${LIB}
 
-# Keep in sync with ld.config.txt in the com.android.runtime APEX.
+# Keep in sync with the "platform" namespace in art/build/apex/ld.config.txt.
 namespace.default.links = runtime,resolv
-namespace.default.visible = true
-
-namespace.default.link.runtime.shared_libs  = libdexfile_external.so
+namespace.default.link.runtime.shared_libs  = libandroidicu.so
+namespace.default.link.runtime.shared_libs += libdexfile_external.so
+namespace.default.link.runtime.shared_libs += libdexfiled_external.so
+# libicuuc.so and libicui18n.so are kept for app compat reason. http://b/130788466
+namespace.default.link.runtime.shared_libs += libicui18n.so
+namespace.default.link.runtime.shared_libs += libicuuc.so
 namespace.default.link.runtime.shared_libs += libnativebridge.so
 namespace.default.link.runtime.shared_libs += libnativehelper.so
 namespace.default.link.runtime.shared_libs += libnativeloader.so
-namespace.default.link.runtime.shared_libs += libandroidicu.so
 
 # TODO(b/122876336): Remove libpac.so once it's migrated to Webview
 namespace.default.link.runtime.shared_libs += libpac.so
@@ -593,16 +624,18 @@
 # "runtime" APEX namespace
 #
 # This namespace exposes externally accessible libraries from the Runtime APEX.
+# Keep in sync with the "runtime" namespace in art/build/apex/ld.config.txt.
 ###############################################################################
 namespace.runtime.isolated = true
+# Visible to allow links to be created at runtime, e.g. through
+# android_link_namespaces in libnativeloader.
 namespace.runtime.visible = true
 
-# Keep in sync with ld.config.txt in the com.android.runtime APEX.
 namespace.runtime.search.paths = /apex/com.android.runtime/${LIB}
 namespace.runtime.asan.search.paths = /apex/com.android.runtime/${LIB}
 namespace.runtime.links = default
-# TODO(b/119867084): Restrict to Bionic dlopen dependencies and PALette library
-# when it exists.
+# TODO(b/130340935): Use a dynamically created linker namespace similar to
+# classloader-namespace for oat files, and tighten this up.
 namespace.runtime.link.default.allow_all_shared_libs = true
 
 ###############################################################################
@@ -629,11 +662,11 @@
 # "conscrypt" APEX namespace
 #
 # This namespace is for libraries within the conscrypt APEX.
+# Keep in sync with the "conscrypt" namespace in art/build/apex/ld.config.txt.
 ###############################################################################
 namespace.conscrypt.isolated = true
 namespace.conscrypt.visible = true
 
-# Keep in sync with ld.config.txt in the com.android.runtime APEX.
 namespace.conscrypt.search.paths = /apex/com.android.conscrypt/${LIB}
 namespace.conscrypt.asan.search.paths = /apex/com.android.conscrypt/${LIB}
 namespace.conscrypt.links = runtime,default
@@ -674,3 +707,5 @@
 namespace.default.search.paths  = /system/${LIB}
 namespace.default.search.paths += /%PRODUCT%/${LIB}
 namespace.default.search.paths += /%PRODUCT_SERVICES%/${LIB}
+
+namespace.default.link.runtime.shared_libs = %SANITIZER_RUNTIME_LIBRARIES%
diff --git a/rootdir/etc/ld.config.vndk_lite.txt b/rootdir/etc/ld.config.vndk_lite.txt
index 11729ee..d616582 100644
--- a/rootdir/etc/ld.config.vndk_lite.txt
+++ b/rootdir/etc/ld.config.vndk_lite.txt
@@ -43,6 +43,9 @@
 # partitions are also allowed temporarily.
 ###############################################################################
 namespace.default.isolated = false
+# Visible because some libraries are dlopen'ed, e.g. libopenjdk is dlopen'ed by
+# libart.
+namespace.default.visible = true
 
 namespace.default.search.paths  = /system/${LIB}
 namespace.default.search.paths += /odm/${LIB}
@@ -61,8 +64,7 @@
 namespace.default.asan.search.paths += /data/asan/%PRODUCT_SERVICES%/${LIB}
 namespace.default.asan.search.paths +=           /%PRODUCT_SERVICES%/${LIB}
 
-# Keep in sync with the platform namespace in the com.android.runtime APEX
-# ld.config.txt.
+# Keep in sync with the "platform" namespace in art/build/apex/ld.config.txt.
 # If a shared library or an executable requests a shared library that
 # cannot be loaded into the default namespace, the dynamic linker tries
 # to load the shared library from the runtime namespace. And then, if the
@@ -70,14 +72,15 @@
 # dynamic linker tries to load the shared library from the resolv namespace.
 # Finally, if all attempts fail, the dynamic linker returns an error.
 namespace.default.links = runtime,resolv
-# Visible because some libraries are dlopen'ed, e.g. libopenjdk is dlopen'ed by
-# libart.
-namespace.default.visible = true
-namespace.default.link.runtime.shared_libs  = libdexfile_external.so
+namespace.default.link.runtime.shared_libs  = libandroidicu.so
+namespace.default.link.runtime.shared_libs += libdexfile_external.so
+namespace.default.link.runtime.shared_libs += libdexfiled_external.so
+# libicuuc.so and libicui18n.so are kept for app compat reason. http://b/130788466
+namespace.default.link.runtime.shared_libs += libicui18n.so
+namespace.default.link.runtime.shared_libs += libicuuc.so
 namespace.default.link.runtime.shared_libs += libnativebridge.so
 namespace.default.link.runtime.shared_libs += libnativehelper.so
 namespace.default.link.runtime.shared_libs += libnativeloader.so
-namespace.default.link.runtime.shared_libs += libandroidicu.so
 
 # TODO(b/122876336): Remove libpac.so once it's migrated to Webview
 namespace.default.link.runtime.shared_libs += libpac.so
@@ -91,17 +94,20 @@
 # "runtime" APEX namespace
 #
 # This namespace pulls in externally accessible libs from the Runtime APEX.
+# Keep in sync with the "runtime" namespace in art/build/apex/ld.config.txt.
 ###############################################################################
 namespace.runtime.isolated = true
+# Visible to allow links to be created at runtime, e.g. through
+# android_link_namespaces in libnativeloader.
 namespace.runtime.visible = true
 
-# Keep in sync with the default namespace in the com.android.runtime APEX
-# ld.config.txt.
 namespace.runtime.search.paths = /apex/com.android.runtime/${LIB}
 namespace.runtime.asan.search.paths = /apex/com.android.runtime/${LIB}
 namespace.runtime.links = default
-# TODO(b/119867084): Restrict to Bionic dlopen dependencies and PALette library
-# when it exists.
+# Need allow_all_shared_libs because libart.so can dlopen oat files in
+# /system/framework and /data.
+# TODO(b/130340935): Use a dynamically created linker namespace similar to
+# classloader-namespace for oat files, and tighten this up.
 namespace.runtime.link.default.allow_all_shared_libs = true
 
 ###############################################################################
@@ -127,11 +133,11 @@
 # "conscrypt" APEX namespace
 #
 # This namespace is for libraries within the conscrypt APEX.
+# Keep in sync with the "conscrypt" namespace in art/build/apex/ld.config.txt.
 ###############################################################################
 namespace.conscrypt.isolated = true
 namespace.conscrypt.visible = true
 
-# Keep in sync with ld.config.txt in the com.android.runtime APEX.
 namespace.conscrypt.search.paths = /apex/com.android.conscrypt/${LIB}
 namespace.conscrypt.asan.search.paths = /apex/com.android.conscrypt/${LIB}
 namespace.conscrypt.links = runtime,default
@@ -174,6 +180,8 @@
 # Note that there is no link from the default namespace to this namespace.
 ###############################################################################
 namespace.sphal.isolated = true
+# Visible to allow links to be created at runtime, e.g. through
+# android_link_namespaces in libnativeloader.
 namespace.sphal.visible = true
 
 namespace.sphal.search.paths  = /odm/${LIB}
@@ -263,6 +271,8 @@
 # This namespace is exclusively for vndk-sp libs.
 ###############################################################################
 namespace.vndk.isolated = true
+# Visible to allow links to be created at runtime, e.g. through
+# android_link_namespaces in libnativeloader.
 namespace.vndk.visible = true
 
 namespace.vndk.search.paths  = /odm/${LIB}/vndk-sp
@@ -355,6 +365,10 @@
 
 namespace.default.links = runtime
 namespace.default.link.runtime.shared_libs  = libdexfile_external.so
+namespace.default.link.runtime.shared_libs += libdexfiled_external.so
+# libicuuc.so and libicui18n.so are kept for app compat reason. http://b/130788466
+namespace.default.link.runtime.shared_libs += libicui18n.so
+namespace.default.link.runtime.shared_libs += libicuuc.so
 namespace.default.link.runtime.shared_libs += libnativebridge.so
 namespace.default.link.runtime.shared_libs += libnativehelper.so
 namespace.default.link.runtime.shared_libs += libnativeloader.so
@@ -365,15 +379,15 @@
 # "runtime" APEX namespace
 #
 # This namespace exposes externally accessible libraries from the Runtime APEX.
+# Keep in sync with the "runtime" namespace in art/build/apex/ld.config.txt.
 ###############################################################################
 namespace.runtime.isolated = true
 
-# Keep in sync with ld.config.txt in the com.android.runtime APEX.
 namespace.runtime.search.paths = /apex/com.android.runtime/${LIB}
 namespace.runtime.asan.search.paths = /apex/com.android.runtime/${LIB}
 namespace.runtime.links = default
-# TODO(b/119867084): Restrict to Bionic dlopen dependencies and PALette library
-# when it exists.
+# TODO(b/130340935): Use a dynamically created linker namespace similar to
+# classloader-namespace for oat files, and tighten this up.
 namespace.runtime.link.default.allow_all_shared_libs = true
 
 ###############################################################################
@@ -385,6 +399,10 @@
 [unrestricted]
 additional.namespaces = runtime,media,conscrypt,resolv
 
+# Visible to allow links to be created at runtime, e.g. through
+# android_link_namespaces in libnativeloader.
+namespace.default.visible = true
+
 namespace.default.search.paths  = /system/${LIB}
 namespace.default.search.paths += /odm/${LIB}
 namespace.default.search.paths += /vendor/${LIB}
@@ -396,15 +414,17 @@
 namespace.default.asan.search.paths += /data/asan/vendor/${LIB}
 namespace.default.asan.search.paths +=           /vendor/${LIB}
 
-# Keep in sync with ld.config.txt in the com.android.runtime APEX.
+# Keep in sync with the "platform" namespace in art/build/apex/ld.config.txt.
 namespace.default.links = runtime,resolv
-namespace.default.visible = true
-
-namespace.default.link.runtime.shared_libs  = libdexfile_external.so
+namespace.default.link.runtime.shared_libs  = libandroidicu.so
+namespace.default.link.runtime.shared_libs += libdexfile_external.so
+namespace.default.link.runtime.shared_libs += libdexfiled_external.so
+# libicuuc.so and libicui18n.so are kept for app compat reason. http://b/130788466
+namespace.default.link.runtime.shared_libs += libicui18n.so
+namespace.default.link.runtime.shared_libs += libicuuc.so
 namespace.default.link.runtime.shared_libs += libnativebridge.so
 namespace.default.link.runtime.shared_libs += libnativehelper.so
 namespace.default.link.runtime.shared_libs += libnativeloader.so
-namespace.default.link.runtime.shared_libs += libandroidicu.so
 
 # TODO(b/122876336): Remove libpac.so once it's migrated to Webview
 namespace.default.link.runtime.shared_libs += libpac.so
@@ -415,16 +435,18 @@
 # "runtime" APEX namespace
 #
 # This namespace exposes externally accessible libraries from the Runtime APEX.
+# Keep in sync with the "runtime" namespace in art/build/apex/ld.config.txt.
 ###############################################################################
 namespace.runtime.isolated = true
+# Visible to allow links to be created at runtime, e.g. through
+# android_link_namespaces in libnativeloader.
 namespace.runtime.visible = true
 
-# Keep in sync with ld.config.txt in the com.android.runtime APEX.
 namespace.runtime.search.paths = /apex/com.android.runtime/${LIB}
 namespace.runtime.asan.search.paths = /apex/com.android.runtime/${LIB}
 namespace.runtime.links = default
-# TODO(b/119867084): Restrict to Bionic dlopen dependencies and PALette library
-# when it exists.
+# TODO(b/130340935): Use a dynamically created linker namespace similar to
+# classloader-namespace for oat files, and tighten this up.
 namespace.runtime.link.default.allow_all_shared_libs = true
 
 ###############################################################################
@@ -450,11 +472,11 @@
 # "conscrypt" APEX namespace
 #
 # This namespace is for libraries within the conscrypt APEX.
+# Keep in sync with the "conscrypt" namespace in art/build/apex/ld.config.txt.
 ###############################################################################
 namespace.conscrypt.isolated = true
 namespace.conscrypt.visible = true
 
-# Keep in sync with ld.config.txt in the com.android.runtime APEX.
 namespace.conscrypt.search.paths = /apex/com.android.conscrypt/${LIB}
 namespace.conscrypt.asan.search.paths = /apex/com.android.conscrypt/${LIB}
 namespace.conscrypt.links = runtime,default
diff --git a/rootdir/fsverity_init.sh b/rootdir/fsverity_init.sh
index 29e4519..4fee15f 100644
--- a/rootdir/fsverity_init.sh
+++ b/rootdir/fsverity_init.sh
@@ -24,6 +24,9 @@
     log -p e -t fsverity_init "Failed to load $cert"
 done
 
-# Prevent future key links to .fs-verity keyring
-/system/bin/mini-keyctl restrict_keyring .fs-verity ||
-  log -p e -t fsverity_init "Failed to restrict .fs-verity keyring"
+DEBUGGABLE=$(getprop ro.debuggable)
+if [ $DEBUGGABLE != "1" ]; then
+  # Prevent future key links to .fs-verity keyring
+  /system/bin/mini-keyctl restrict_keyring .fs-verity ||
+    log -p e -t fsverity_init "Failed to restrict .fs-verity keyring"
+fi
diff --git a/toolbox/Android.bp b/toolbox/Android.bp
index 1f852ff..5289976 100644
--- a/toolbox/Android.bp
+++ b/toolbox/Android.bp
@@ -56,14 +56,6 @@
     defaults: ["toolbox_binary_defaults"],
 }
 
-// We only want 'r' on userdebug and eng builds.
-cc_binary {
-    name: "r",
-    defaults: ["toolbox_defaults"],
-    srcs: ["r.c"],
-    vendor_available: true,
-}
-
 // We build BSD grep separately (but see http://b/111849261).
 cc_defaults {
     name: "grep_common",
diff --git a/toolbox/r.c b/toolbox/r.c
deleted file mode 100644
index b96cdb2..0000000
--- a/toolbox/r.c
+++ /dev/null
@@ -1,102 +0,0 @@
-#include <fcntl.h>
-#include <inttypes.h>
-#include <stdbool.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/mman.h>
-#include <unistd.h>
-
-#if __LP64__
-#define strtoptr strtoull
-#else
-#define strtoptr strtoul
-#endif
-
-static int usage()
-{
-    fprintf(stderr,"r [-b|-s] <address> [<value>]\n");
-    return -1;
-}
-
-int main(int argc, char *argv[])
-{
-    if(argc < 2) return usage();
-
-    int width = 4;
-    if(!strcmp(argv[1], "-b")) {
-        width = 1;
-        argc--;
-        argv++;
-    } else if(!strcmp(argv[1], "-s")) {
-        width = 2;
-        argc--;
-        argv++;
-    }
-
-    if(argc < 2) return usage();
-    uintptr_t addr = strtoptr(argv[1], 0, 16);
-
-    uintptr_t endaddr = 0;
-    char* end = strchr(argv[1], '-');
-    if (end)
-        endaddr = strtoptr(end + 1, 0, 16);
-
-    if (!endaddr)
-        endaddr = addr + width - 1;
-
-    if (endaddr <= addr) {
-        fprintf(stderr, "end address <= start address\n");
-        return -1;
-    }
-
-    bool set = false;
-    uint32_t value = 0;
-    if(argc > 2) {
-        set = true;
-        value = strtoul(argv[2], 0, 16);
-    }
-
-    int fd = open("/dev/mem", O_RDWR | O_SYNC);
-    if(fd < 0) {
-        fprintf(stderr,"cannot open /dev/mem\n");
-        return -1;
-    }
-
-    off64_t mmap_start = addr & ~(PAGE_SIZE - 1);
-    size_t mmap_size = endaddr - mmap_start + 1;
-    mmap_size = (mmap_size + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1);
-
-    void* page = mmap64(0, mmap_size, PROT_READ | PROT_WRITE,
-                        MAP_SHARED, fd, mmap_start);
-
-    if(page == MAP_FAILED){
-        fprintf(stderr,"cannot mmap region\n");
-        return -1;
-    }
-
-    while (addr <= endaddr) {
-        switch(width){
-        case 4: {
-            uint32_t* x = (uint32_t*) (((uintptr_t) page) + (addr & 4095));
-            if(set) *x = value;
-            fprintf(stderr,"%08"PRIxPTR": %08x\n", addr, *x);
-            break;
-        }
-        case 2: {
-            uint16_t* x = (uint16_t*) (((uintptr_t) page) + (addr & 4095));
-            if(set) *x = value;
-            fprintf(stderr,"%08"PRIxPTR": %04x\n", addr, *x);
-            break;
-        }
-        case 1: {
-            uint8_t* x = (uint8_t*) (((uintptr_t) page) + (addr & 4095));
-            if(set) *x = value;
-            fprintf(stderr,"%08"PRIxPTR": %02x\n", addr, *x);
-            break;
-        }
-        }
-        addr += width;
-    }
-    return 0;
-}
diff --git a/trusty/keymaster/4.0/TrustyKeymaster4Device.cpp b/trusty/keymaster/4.0/TrustyKeymaster4Device.cpp
new file mode 100644
index 0000000..b5fc6bf
--- /dev/null
+++ b/trusty/keymaster/4.0/TrustyKeymaster4Device.cpp
@@ -0,0 +1,571 @@
+/*
+ **
+ ** Copyright 2018, The Android Open Source Project
+ **
+ ** Licensed under the Apache License, Version 2.0 (the "License");
+ ** you may not use this file except in compliance with the License.
+ ** You may obtain a copy of the License at
+ **
+ **     http://www.apache.org/licenses/LICENSE-2.0
+ **
+ ** Unless required by applicable law or agreed to in writing, software
+ ** distributed under the License is distributed on an "AS IS" BASIS,
+ ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ ** See the License for the specific language governing permissions and
+ ** limitations under the License.
+ */
+
+#define LOG_TAG "android.hardware.keymaster@4.0-impl.trusty"
+
+#include <authorization_set.h>
+#include <cutils/log.h>
+#include <keymaster/android_keymaster_messages.h>
+#include <trusty_keymaster/TrustyKeymaster4Device.h>
+#include <trusty_keymaster/ipc/trusty_keymaster_ipc.h>
+
+using ::keymaster::AbortOperationRequest;
+using ::keymaster::AbortOperationResponse;
+using ::keymaster::AddEntropyRequest;
+using ::keymaster::AddEntropyResponse;
+using ::keymaster::AttestKeyRequest;
+using ::keymaster::AttestKeyResponse;
+using ::keymaster::AuthorizationSet;
+using ::keymaster::BeginOperationRequest;
+using ::keymaster::BeginOperationResponse;
+using ::keymaster::ExportKeyRequest;
+using ::keymaster::ExportKeyResponse;
+using ::keymaster::FinishOperationRequest;
+using ::keymaster::FinishOperationResponse;
+using ::keymaster::GenerateKeyRequest;
+using ::keymaster::GenerateKeyResponse;
+using ::keymaster::GetKeyCharacteristicsRequest;
+using ::keymaster::GetKeyCharacteristicsResponse;
+using ::keymaster::ImportKeyRequest;
+using ::keymaster::ImportKeyResponse;
+using ::keymaster::UpdateOperationRequest;
+using ::keymaster::UpdateOperationResponse;
+using ::keymaster::ng::Tag;
+
+namespace keymaster {
+namespace V4_0 {
+namespace {
+
+inline keymaster_tag_t legacy_enum_conversion(const Tag value) {
+    return keymaster_tag_t(value);
+}
+inline Tag legacy_enum_conversion(const keymaster_tag_t value) {
+    return Tag(value);
+}
+inline keymaster_purpose_t legacy_enum_conversion(const KeyPurpose value) {
+    return keymaster_purpose_t(value);
+}
+inline keymaster_key_format_t legacy_enum_conversion(const KeyFormat value) {
+    return keymaster_key_format_t(value);
+}
+
+inline SecurityLevel legacy_enum_conversion(const keymaster_security_level_t value) {
+    return static_cast<SecurityLevel>(value);
+}
+
+inline hw_authenticator_type_t legacy_enum_conversion(const HardwareAuthenticatorType value) {
+    return static_cast<hw_authenticator_type_t>(value);
+}
+
+inline ErrorCode legacy_enum_conversion(const keymaster_error_t value) {
+    return ErrorCode(value);
+}
+
+inline keymaster_tag_type_t typeFromTag(const keymaster_tag_t tag) {
+    return keymaster_tag_get_type(tag);
+}
+
+class KmParamSet : public keymaster_key_param_set_t {
+  public:
+    KmParamSet(const hidl_vec<KeyParameter>& keyParams) {
+        params = new keymaster_key_param_t[keyParams.size()];
+        length = keyParams.size();
+        for (size_t i = 0; i < keyParams.size(); ++i) {
+            auto tag = legacy_enum_conversion(keyParams[i].tag);
+            switch (typeFromTag(tag)) {
+                case KM_ENUM:
+                case KM_ENUM_REP:
+                    params[i] = keymaster_param_enum(tag, keyParams[i].f.integer);
+                    break;
+                case KM_UINT:
+                case KM_UINT_REP:
+                    params[i] = keymaster_param_int(tag, keyParams[i].f.integer);
+                    break;
+                case KM_ULONG:
+                case KM_ULONG_REP:
+                    params[i] = keymaster_param_long(tag, keyParams[i].f.longInteger);
+                    break;
+                case KM_DATE:
+                    params[i] = keymaster_param_date(tag, keyParams[i].f.dateTime);
+                    break;
+                case KM_BOOL:
+                    if (keyParams[i].f.boolValue)
+                        params[i] = keymaster_param_bool(tag);
+                    else
+                        params[i].tag = KM_TAG_INVALID;
+                    break;
+                case KM_BIGNUM:
+                case KM_BYTES:
+                    params[i] = keymaster_param_blob(tag, &keyParams[i].blob[0],
+                                                     keyParams[i].blob.size());
+                    break;
+                case KM_INVALID:
+                default:
+                    params[i].tag = KM_TAG_INVALID;
+                    /* just skip */
+                    break;
+            }
+        }
+    }
+    KmParamSet(KmParamSet&& other) noexcept
+        : keymaster_key_param_set_t{other.params, other.length} {
+        other.length = 0;
+        other.params = nullptr;
+    }
+    KmParamSet(const KmParamSet&) = delete;
+    ~KmParamSet() { delete[] params; }
+};
+
+inline hidl_vec<uint8_t> kmBlob2hidlVec(const keymaster_key_blob_t& blob) {
+    hidl_vec<uint8_t> result;
+    result.setToExternal(const_cast<unsigned char*>(blob.key_material), blob.key_material_size);
+    return result;
+}
+
+inline hidl_vec<uint8_t> kmBlob2hidlVec(const keymaster_blob_t& blob) {
+    hidl_vec<uint8_t> result;
+    result.setToExternal(const_cast<unsigned char*>(blob.data), blob.data_length);
+    return result;
+}
+
+inline hidl_vec<uint8_t> kmBuffer2hidlVec(const ::keymaster::Buffer& buf) {
+    hidl_vec<uint8_t> result;
+    result.setToExternal(const_cast<unsigned char*>(buf.peek_read()), buf.available_read());
+    return result;
+}
+
+inline static hidl_vec<hidl_vec<uint8_t>> kmCertChain2Hidl(
+        const keymaster_cert_chain_t& cert_chain) {
+    hidl_vec<hidl_vec<uint8_t>> result;
+    if (!cert_chain.entry_count || !cert_chain.entries) return result;
+
+    result.resize(cert_chain.entry_count);
+    for (size_t i = 0; i < cert_chain.entry_count; ++i) {
+        result[i] = kmBlob2hidlVec(cert_chain.entries[i]);
+    }
+
+    return result;
+}
+
+static inline hidl_vec<KeyParameter> kmParamSet2Hidl(const keymaster_key_param_set_t& set) {
+    hidl_vec<KeyParameter> result;
+    if (set.length == 0 || set.params == nullptr) return result;
+
+    result.resize(set.length);
+    keymaster_key_param_t* params = set.params;
+    for (size_t i = 0; i < set.length; ++i) {
+        auto tag = params[i].tag;
+        result[i].tag = legacy_enum_conversion(tag);
+        switch (typeFromTag(tag)) {
+            case KM_ENUM:
+            case KM_ENUM_REP:
+                result[i].f.integer = params[i].enumerated;
+                break;
+            case KM_UINT:
+            case KM_UINT_REP:
+                result[i].f.integer = params[i].integer;
+                break;
+            case KM_ULONG:
+            case KM_ULONG_REP:
+                result[i].f.longInteger = params[i].long_integer;
+                break;
+            case KM_DATE:
+                result[i].f.dateTime = params[i].date_time;
+                break;
+            case KM_BOOL:
+                result[i].f.boolValue = params[i].boolean;
+                break;
+            case KM_BIGNUM:
+            case KM_BYTES:
+                result[i].blob.setToExternal(const_cast<unsigned char*>(params[i].blob.data),
+                                             params[i].blob.data_length);
+                break;
+            case KM_INVALID:
+            default:
+                params[i].tag = KM_TAG_INVALID;
+                /* just skip */
+                break;
+        }
+    }
+    return result;
+}
+
+void addClientAndAppData(const hidl_vec<uint8_t>& clientId, const hidl_vec<uint8_t>& appData,
+                         ::keymaster::AuthorizationSet* params) {
+    params->Clear();
+    if (clientId.size()) {
+        params->push_back(::keymaster::TAG_APPLICATION_ID, clientId.data(), clientId.size());
+    }
+    if (appData.size()) {
+        params->push_back(::keymaster::TAG_APPLICATION_DATA, appData.data(), appData.size());
+    }
+}
+
+}  // anonymous namespace
+
+TrustyKeymaster4Device::TrustyKeymaster4Device(TrustyKeymaster* impl) : impl_(impl) {}
+
+TrustyKeymaster4Device::~TrustyKeymaster4Device() {}
+
+Return<void> TrustyKeymaster4Device::getHardwareInfo(getHardwareInfo_cb _hidl_cb) {
+    _hidl_cb(SecurityLevel::TRUSTED_ENVIRONMENT, "TrustyKeymaster", "Google");
+    return Void();
+}
+
+Return<void> TrustyKeymaster4Device::getHmacSharingParameters(
+        getHmacSharingParameters_cb _hidl_cb) {
+    const GetHmacSharingParametersResponse response = impl_->GetHmacSharingParameters();
+    // response.params is not the same as the HIDL structure, we need to convert it
+    V4_0::HmacSharingParameters params;
+    params.seed.setToExternal(const_cast<uint8_t*>(response.params.seed.data),
+                              response.params.seed.data_length);
+    static_assert(sizeof(response.params.nonce) == params.nonce.size(), "Nonce sizes don't match");
+    memcpy(params.nonce.data(), response.params.nonce, params.nonce.size());
+    _hidl_cb(legacy_enum_conversion(response.error), params);
+    return Void();
+}
+
+Return<void> TrustyKeymaster4Device::computeSharedHmac(
+        const hidl_vec<HmacSharingParameters>& params, computeSharedHmac_cb _hidl_cb) {
+    ComputeSharedHmacRequest request;
+    request.params_array.params_array = new keymaster::HmacSharingParameters[params.size()];
+    request.params_array.num_params = params.size();
+    for (size_t i = 0; i < params.size(); ++i) {
+        request.params_array.params_array[i].seed = {params[i].seed.data(), params[i].seed.size()};
+        static_assert(sizeof(request.params_array.params_array[i].nonce) ==
+                              decltype(params[i].nonce)::size(),
+                      "Nonce sizes don't match");
+        memcpy(request.params_array.params_array[i].nonce, params[i].nonce.data(),
+               params[i].nonce.size());
+    }
+
+    auto response = impl_->ComputeSharedHmac(request);
+    hidl_vec<uint8_t> sharing_check;
+    if (response.error == KM_ERROR_OK) {
+        sharing_check = kmBlob2hidlVec(response.sharing_check);
+    }
+
+    _hidl_cb(legacy_enum_conversion(response.error), sharing_check);
+    return Void();
+}
+
+Return<void> TrustyKeymaster4Device::verifyAuthorization(
+        uint64_t challenge, const hidl_vec<KeyParameter>& parametersToVerify,
+        const HardwareAuthToken& authToken, verifyAuthorization_cb _hidl_cb) {
+    VerifyAuthorizationRequest request;
+    request.challenge = challenge;
+    request.parameters_to_verify.Reinitialize(KmParamSet(parametersToVerify));
+    request.auth_token.challenge = authToken.challenge;
+    request.auth_token.user_id = authToken.userId;
+    request.auth_token.authenticator_id = authToken.authenticatorId;
+    request.auth_token.authenticator_type = legacy_enum_conversion(authToken.authenticatorType);
+    request.auth_token.timestamp = authToken.timestamp;
+    KeymasterBlob mac(authToken.mac.data(), authToken.mac.size());
+    request.auth_token.mac = mac;
+
+    auto response = impl_->VerifyAuthorization(request);
+
+    ::android::hardware::keymaster::V4_0::VerificationToken token;
+    token.challenge = response.token.challenge;
+    token.timestamp = response.token.timestamp;
+    token.parametersVerified = kmParamSet2Hidl(response.token.parameters_verified);
+    token.securityLevel = legacy_enum_conversion(response.token.security_level);
+    token.mac = kmBlob2hidlVec(response.token.mac);
+
+    _hidl_cb(legacy_enum_conversion(response.error), token);
+
+    return Void();
+}
+
+Return<ErrorCode> TrustyKeymaster4Device::addRngEntropy(const hidl_vec<uint8_t>& data) {
+    if (data.size() == 0) return ErrorCode::OK;
+    AddEntropyRequest request;
+    request.random_data.Reinitialize(data.data(), data.size());
+
+    AddEntropyResponse response;
+    impl_->AddRngEntropy(request, &response);
+
+    return legacy_enum_conversion(response.error);
+}
+
+Return<void> TrustyKeymaster4Device::generateKey(const hidl_vec<KeyParameter>& keyParams,
+                                                 generateKey_cb _hidl_cb) {
+    GenerateKeyRequest request;
+    request.key_description.Reinitialize(KmParamSet(keyParams));
+
+    GenerateKeyResponse response;
+    impl_->GenerateKey(request, &response);
+
+    KeyCharacteristics resultCharacteristics;
+    hidl_vec<uint8_t> resultKeyBlob;
+    if (response.error == KM_ERROR_OK) {
+        resultKeyBlob = kmBlob2hidlVec(response.key_blob);
+        resultCharacteristics.hardwareEnforced = kmParamSet2Hidl(response.enforced);
+        resultCharacteristics.softwareEnforced = kmParamSet2Hidl(response.unenforced);
+    }
+    _hidl_cb(legacy_enum_conversion(response.error), resultKeyBlob, resultCharacteristics);
+    return Void();
+}
+
+Return<void> TrustyKeymaster4Device::getKeyCharacteristics(const hidl_vec<uint8_t>& keyBlob,
+                                                           const hidl_vec<uint8_t>& clientId,
+                                                           const hidl_vec<uint8_t>& appData,
+                                                           getKeyCharacteristics_cb _hidl_cb) {
+    GetKeyCharacteristicsRequest request;
+    request.SetKeyMaterial(keyBlob.data(), keyBlob.size());
+    addClientAndAppData(clientId, appData, &request.additional_params);
+
+    GetKeyCharacteristicsResponse response;
+    impl_->GetKeyCharacteristics(request, &response);
+
+    KeyCharacteristics resultCharacteristics;
+    if (response.error == KM_ERROR_OK) {
+        resultCharacteristics.hardwareEnforced = kmParamSet2Hidl(response.enforced);
+        resultCharacteristics.softwareEnforced = kmParamSet2Hidl(response.unenforced);
+    }
+    _hidl_cb(legacy_enum_conversion(response.error), resultCharacteristics);
+    return Void();
+}
+
+Return<void> TrustyKeymaster4Device::importKey(const hidl_vec<KeyParameter>& params,
+                                               KeyFormat keyFormat,
+                                               const hidl_vec<uint8_t>& keyData,
+                                               importKey_cb _hidl_cb) {
+    ImportKeyRequest request;
+    request.key_description.Reinitialize(KmParamSet(params));
+    request.key_format = legacy_enum_conversion(keyFormat);
+    request.SetKeyMaterial(keyData.data(), keyData.size());
+
+    ImportKeyResponse response;
+    impl_->ImportKey(request, &response);
+
+    KeyCharacteristics resultCharacteristics;
+    hidl_vec<uint8_t> resultKeyBlob;
+    if (response.error == KM_ERROR_OK) {
+        resultKeyBlob = kmBlob2hidlVec(response.key_blob);
+        resultCharacteristics.hardwareEnforced = kmParamSet2Hidl(response.enforced);
+        resultCharacteristics.softwareEnforced = kmParamSet2Hidl(response.unenforced);
+    }
+    _hidl_cb(legacy_enum_conversion(response.error), resultKeyBlob, resultCharacteristics);
+    return Void();
+}
+
+Return<void> TrustyKeymaster4Device::importWrappedKey(
+        const hidl_vec<uint8_t>& wrappedKeyData, const hidl_vec<uint8_t>& wrappingKeyBlob,
+        const hidl_vec<uint8_t>& maskingKey, const hidl_vec<KeyParameter>& unwrappingParams,
+        uint64_t passwordSid, uint64_t biometricSid, importWrappedKey_cb _hidl_cb) {
+    ImportWrappedKeyRequest request;
+    request.SetWrappedMaterial(wrappedKeyData.data(), wrappedKeyData.size());
+    request.SetWrappingMaterial(wrappingKeyBlob.data(), wrappingKeyBlob.size());
+    request.SetMaskingKeyMaterial(maskingKey.data(), maskingKey.size());
+    request.additional_params.Reinitialize(KmParamSet(unwrappingParams));
+    request.password_sid = passwordSid;
+    request.biometric_sid = biometricSid;
+
+    ImportWrappedKeyResponse response;
+    impl_->ImportWrappedKey(request, &response);
+
+    KeyCharacteristics resultCharacteristics;
+    hidl_vec<uint8_t> resultKeyBlob;
+    if (response.error == KM_ERROR_OK) {
+        resultKeyBlob = kmBlob2hidlVec(response.key_blob);
+        resultCharacteristics.hardwareEnforced = kmParamSet2Hidl(response.enforced);
+        resultCharacteristics.softwareEnforced = kmParamSet2Hidl(response.unenforced);
+    }
+    _hidl_cb(legacy_enum_conversion(response.error), resultKeyBlob, resultCharacteristics);
+    return Void();
+}
+
+Return<void> TrustyKeymaster4Device::exportKey(KeyFormat exportFormat,
+                                               const hidl_vec<uint8_t>& keyBlob,
+                                               const hidl_vec<uint8_t>& clientId,
+                                               const hidl_vec<uint8_t>& appData,
+                                               exportKey_cb _hidl_cb) {
+    ExportKeyRequest request;
+    request.key_format = legacy_enum_conversion(exportFormat);
+    request.SetKeyMaterial(keyBlob.data(), keyBlob.size());
+    addClientAndAppData(clientId, appData, &request.additional_params);
+
+    ExportKeyResponse response;
+    impl_->ExportKey(request, &response);
+
+    hidl_vec<uint8_t> resultKeyBlob;
+    if (response.error == KM_ERROR_OK) {
+        resultKeyBlob.setToExternal(response.key_data, response.key_data_length);
+    }
+    _hidl_cb(legacy_enum_conversion(response.error), resultKeyBlob);
+    return Void();
+}
+
+Return<void> TrustyKeymaster4Device::attestKey(const hidl_vec<uint8_t>& keyToAttest,
+                                               const hidl_vec<KeyParameter>& attestParams,
+                                               attestKey_cb _hidl_cb) {
+    AttestKeyRequest request;
+    request.SetKeyMaterial(keyToAttest.data(), keyToAttest.size());
+    request.attest_params.Reinitialize(KmParamSet(attestParams));
+
+    AttestKeyResponse response;
+    impl_->AttestKey(request, &response);
+
+    hidl_vec<hidl_vec<uint8_t>> resultCertChain;
+    if (response.error == KM_ERROR_OK) {
+        resultCertChain = kmCertChain2Hidl(response.certificate_chain);
+    }
+    _hidl_cb(legacy_enum_conversion(response.error), resultCertChain);
+    return Void();
+}
+
+Return<void> TrustyKeymaster4Device::upgradeKey(const hidl_vec<uint8_t>& keyBlobToUpgrade,
+                                                const hidl_vec<KeyParameter>& upgradeParams,
+                                                upgradeKey_cb _hidl_cb) {
+    UpgradeKeyRequest request;
+    request.SetKeyMaterial(keyBlobToUpgrade.data(), keyBlobToUpgrade.size());
+    request.upgrade_params.Reinitialize(KmParamSet(upgradeParams));
+
+    UpgradeKeyResponse response;
+    impl_->UpgradeKey(request, &response);
+
+    if (response.error == KM_ERROR_OK) {
+        _hidl_cb(ErrorCode::OK, kmBlob2hidlVec(response.upgraded_key));
+    } else {
+        _hidl_cb(legacy_enum_conversion(response.error), hidl_vec<uint8_t>());
+    }
+    return Void();
+}
+
+Return<ErrorCode> TrustyKeymaster4Device::deleteKey(const hidl_vec<uint8_t>& keyBlob) {
+    DeleteKeyRequest request;
+    request.SetKeyMaterial(keyBlob.data(), keyBlob.size());
+
+    DeleteKeyResponse response;
+    impl_->DeleteKey(request, &response);
+
+    return legacy_enum_conversion(response.error);
+}
+
+Return<ErrorCode> TrustyKeymaster4Device::deleteAllKeys() {
+    DeleteAllKeysRequest request;
+    DeleteAllKeysResponse response;
+    impl_->DeleteAllKeys(request, &response);
+
+    return legacy_enum_conversion(response.error);
+}
+
+Return<ErrorCode> TrustyKeymaster4Device::destroyAttestationIds() {
+    return ErrorCode::UNIMPLEMENTED;
+}
+
+Return<void> TrustyKeymaster4Device::begin(KeyPurpose purpose, const hidl_vec<uint8_t>& key,
+                                           const hidl_vec<KeyParameter>& inParams,
+                                           const HardwareAuthToken& authToken, begin_cb _hidl_cb) {
+    (void)authToken;
+    BeginOperationRequest request;
+    request.purpose = legacy_enum_conversion(purpose);
+    request.SetKeyMaterial(key.data(), key.size());
+    request.additional_params.Reinitialize(KmParamSet(inParams));
+
+    BeginOperationResponse response;
+    impl_->BeginOperation(request, &response);
+
+    hidl_vec<KeyParameter> resultParams;
+    if (response.error == KM_ERROR_OK) {
+        resultParams = kmParamSet2Hidl(response.output_params);
+    }
+
+    _hidl_cb(legacy_enum_conversion(response.error), resultParams, response.op_handle);
+    return Void();
+}
+
+Return<void> TrustyKeymaster4Device::update(uint64_t operationHandle,
+                                            const hidl_vec<KeyParameter>& inParams,
+                                            const hidl_vec<uint8_t>& input,
+                                            const HardwareAuthToken& authToken,
+                                            const VerificationToken& verificationToken,
+                                            update_cb _hidl_cb) {
+    (void)authToken;
+    (void)verificationToken;
+    UpdateOperationRequest request;
+    UpdateOperationResponse response;
+    hidl_vec<KeyParameter> resultParams;
+    hidl_vec<uint8_t> resultBlob;
+    uint32_t resultConsumed = 0;
+
+    request.op_handle = operationHandle;
+    request.additional_params.Reinitialize(KmParamSet(inParams));
+
+    size_t inp_size = input.size();
+    size_t ser_size = request.SerializedSize();
+
+    if (ser_size > TRUSTY_KEYMASTER_SEND_BUF_SIZE) {
+        response.error = KM_ERROR_INVALID_INPUT_LENGTH;
+    } else {
+        if (ser_size + inp_size > TRUSTY_KEYMASTER_SEND_BUF_SIZE) {
+            inp_size = TRUSTY_KEYMASTER_SEND_BUF_SIZE - ser_size;
+        }
+        request.input.Reinitialize(input.data(), inp_size);
+
+        impl_->UpdateOperation(request, &response);
+
+        if (response.error == KM_ERROR_OK) {
+            resultConsumed = response.input_consumed;
+            resultParams = kmParamSet2Hidl(response.output_params);
+            resultBlob = kmBuffer2hidlVec(response.output);
+        }
+    }
+    _hidl_cb(legacy_enum_conversion(response.error), resultConsumed, resultParams, resultBlob);
+    return Void();
+}
+
+Return<void> TrustyKeymaster4Device::finish(uint64_t operationHandle,
+                                            const hidl_vec<KeyParameter>& inParams,
+                                            const hidl_vec<uint8_t>& input,
+                                            const hidl_vec<uint8_t>& signature,
+                                            const HardwareAuthToken& authToken,
+                                            const VerificationToken& verificationToken,
+                                            finish_cb _hidl_cb) {
+    (void)authToken;
+    (void)verificationToken;
+    FinishOperationRequest request;
+    request.op_handle = operationHandle;
+    request.input.Reinitialize(input.data(), input.size());
+    request.signature.Reinitialize(signature.data(), signature.size());
+    request.additional_params.Reinitialize(KmParamSet(inParams));
+
+    FinishOperationResponse response;
+    impl_->FinishOperation(request, &response);
+
+    hidl_vec<KeyParameter> resultParams;
+    hidl_vec<uint8_t> resultBlob;
+    if (response.error == KM_ERROR_OK) {
+        resultParams = kmParamSet2Hidl(response.output_params);
+        resultBlob = kmBuffer2hidlVec(response.output);
+    }
+    _hidl_cb(legacy_enum_conversion(response.error), resultParams, resultBlob);
+    return Void();
+}
+
+Return<ErrorCode> TrustyKeymaster4Device::abort(uint64_t operationHandle) {
+    AbortOperationRequest request;
+    request.op_handle = operationHandle;
+
+    AbortOperationResponse response;
+    impl_->AbortOperation(request, &response);
+
+    return legacy_enum_conversion(response.error);
+}
+}  // namespace V4_0
+}  // namespace keymaster
diff --git a/trusty/keymaster/4.0/android.hardware.keymaster@4.0-service.trusty.rc b/trusty/keymaster/4.0/android.hardware.keymaster@4.0-service.trusty.rc
new file mode 100644
index 0000000..72c9167
--- /dev/null
+++ b/trusty/keymaster/4.0/android.hardware.keymaster@4.0-service.trusty.rc
@@ -0,0 +1,4 @@
+service vendor.keymaster-4-0 /vendor/bin/hw/android.hardware.keymaster@4.0-service.trusty
+    class early_hal
+    user nobody
+    group drmrpc
diff --git a/trusty/keymaster/4.0/service.cpp b/trusty/keymaster/4.0/service.cpp
new file mode 100644
index 0000000..96eb584
--- /dev/null
+++ b/trusty/keymaster/4.0/service.cpp
@@ -0,0 +1,43 @@
+/*
+**
+** Copyright 2018, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+**
+**     http://www.apache.org/licenses/LICENSE-2.0
+**
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+*/
+
+#include <android-base/logging.h>
+#include <android/hardware/keymaster/4.0/IKeymasterDevice.h>
+#include <hidl/HidlTransportSupport.h>
+#include <trusty_keymaster/TrustyKeymaster.h>
+#include <trusty_keymaster/TrustyKeymaster4Device.h>
+
+int main() {
+    ::android::hardware::configureRpcThreadpool(1, true);
+    auto trustyKeymaster = new keymaster::TrustyKeymaster();
+    int err = trustyKeymaster->Initialize();
+    if (err != 0) {
+        LOG(FATAL) << "Could not initialize TrustyKeymaster (" << err << ")";
+        return -1;
+    }
+
+    auto keymaster = new ::keymaster::V4_0::TrustyKeymaster4Device(trustyKeymaster);
+
+    auto status = keymaster->registerAsService();
+    if (status != android::OK) {
+        LOG(FATAL) << "Could not register service for Keymaster 4.0 (" << status << ")";
+        return -1;
+    }
+
+    android::hardware::joinRpcThreadpool();
+    return -1;  // Should never get here.
+}
diff --git a/trusty/keymaster/Android.bp b/trusty/keymaster/Android.bp
index 819851f..d107b78 100644
--- a/trusty/keymaster/Android.bp
+++ b/trusty/keymaster/Android.bp
@@ -108,3 +108,34 @@
         "android.hardware.keymaster@3.0"
     ],
 }
+
+cc_binary {
+    name: "android.hardware.keymaster@4.0-service.trusty",
+    defaults: ["hidl_defaults"],
+    relative_install_path: "hw",
+    vendor: true,
+    init_rc: ["4.0/android.hardware.keymaster@4.0-service.trusty.rc"],
+    srcs: [
+        "4.0/service.cpp",
+        "4.0/TrustyKeymaster4Device.cpp",
+        "ipc/trusty_keymaster_ipc.cpp",
+        "TrustyKeymaster.cpp",
+    ],
+
+    local_include_dirs: ["include"],
+
+    shared_libs: [
+        "liblog",
+        "libcutils",
+        "libdl",
+        "libbase",
+        "libutils",
+        "libhardware",
+        "libhidlbase",
+        "libhidltransport",
+        "libtrusty",
+        "libkeymaster_messages",
+        "libkeymaster4",
+        "android.hardware.keymaster@4.0"
+    ],
+}
diff --git a/trusty/keymaster/TrustyKeymaster.cpp b/trusty/keymaster/TrustyKeymaster.cpp
index 7f5e87f..f3ef747 100644
--- a/trusty/keymaster/TrustyKeymaster.cpp
+++ b/trusty/keymaster/TrustyKeymaster.cpp
@@ -172,24 +172,25 @@
     ForwardCommand(KM_ABORT_OPERATION, request, response);
 }
 
-/* Methods for Keymaster 4.0 functionality -- not yet implemented */
 GetHmacSharingParametersResponse TrustyKeymaster::GetHmacSharingParameters() {
+    // Dummy empty buffer to allow ForwardCommand to have something to serialize
+    Buffer request;
     GetHmacSharingParametersResponse response;
-    response.error = KM_ERROR_UNIMPLEMENTED;
+    ForwardCommand(KM_GET_HMAC_SHARING_PARAMETERS, request, &response);
     return response;
 }
 
 ComputeSharedHmacResponse TrustyKeymaster::ComputeSharedHmac(
-        const ComputeSharedHmacRequest& /* request */) {
+        const ComputeSharedHmacRequest& request) {
     ComputeSharedHmacResponse response;
-    response.error = KM_ERROR_UNIMPLEMENTED;
+    ForwardCommand(KM_COMPUTE_SHARED_HMAC, request, &response);
     return response;
 }
 
 VerifyAuthorizationResponse TrustyKeymaster::VerifyAuthorization(
-        const VerifyAuthorizationRequest& /* request */) {
+        const VerifyAuthorizationRequest& request) {
     VerifyAuthorizationResponse response;
-    response.error = KM_ERROR_UNIMPLEMENTED;
+    ForwardCommand(KM_VERIFY_AUTHORIZATION, request, &response);
     return response;
 }
 
diff --git a/trusty/keymaster/include/trusty_keymaster/TrustyKeymaster4Device.h b/trusty/keymaster/include/trusty_keymaster/TrustyKeymaster4Device.h
new file mode 100644
index 0000000..2be15bc
--- /dev/null
+++ b/trusty/keymaster/include/trusty_keymaster/TrustyKeymaster4Device.h
@@ -0,0 +1,105 @@
+/*
+ **
+ ** Copyright 2017, The Android Open Source Project
+ **
+ ** Licensed under the Apache License, Version 2.0 (the "License");
+ ** you may not use this file except in compliance with the License.
+ ** You may obtain a copy of the License at
+ **
+ **     http://www.apache.org/licenses/LICENSE-2.0
+ **
+ ** Unless required by applicable law or agreed to in writing, software
+ ** distributed under the License is distributed on an "AS IS" BASIS,
+ ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ ** See the License for the specific language governing permissions and
+ ** limitations under the License.
+ */
+
+#ifndef keymaster_V4_0_TrustyKeymaster4Device_H_
+#define keymaster_V4_0_TrustyKeymaster4Device_H_
+
+#include <android/hardware/keymaster/4.0/IKeymasterDevice.h>
+#include <hidl/Status.h>
+#include <trusty_keymaster/TrustyKeymaster.h>
+
+namespace keymaster {
+
+namespace V4_0 {
+
+using ::android::sp;
+using ::android::hardware::hidl_vec;
+using ::android::hardware::Return;
+using ::android::hardware::Void;
+using ::android::hardware::keymaster::V4_0::ErrorCode;
+using ::android::hardware::keymaster::V4_0::HardwareAuthenticatorType;
+using ::android::hardware::keymaster::V4_0::HardwareAuthToken;
+using ::android::hardware::keymaster::V4_0::HmacSharingParameters;
+using ::android::hardware::keymaster::V4_0::IKeymasterDevice;
+using ::android::hardware::keymaster::V4_0::KeyCharacteristics;
+using ::android::hardware::keymaster::V4_0::KeyFormat;
+using ::android::hardware::keymaster::V4_0::KeyParameter;
+using ::android::hardware::keymaster::V4_0::KeyPurpose;
+using ::android::hardware::keymaster::V4_0::SecurityLevel;
+using ::android::hardware::keymaster::V4_0::Tag;
+using ::android::hardware::keymaster::V4_0::VerificationToken;
+
+class TrustyKeymaster4Device : public IKeymasterDevice {
+  public:
+    explicit TrustyKeymaster4Device(TrustyKeymaster* impl);
+    virtual ~TrustyKeymaster4Device();
+
+    Return<void> getHardwareInfo(getHardwareInfo_cb _hidl_cb) override;
+    Return<void> getHmacSharingParameters(getHmacSharingParameters_cb _hidl_cb) override;
+    Return<void> computeSharedHmac(const hidl_vec<HmacSharingParameters>& params,
+                                   computeSharedHmac_cb) override;
+    Return<void> verifyAuthorization(uint64_t challenge,
+                                     const hidl_vec<KeyParameter>& parametersToVerify,
+                                     const HardwareAuthToken& authToken,
+                                     verifyAuthorization_cb _hidl_cb) override;
+    Return<ErrorCode> addRngEntropy(const hidl_vec<uint8_t>& data) override;
+    Return<void> generateKey(const hidl_vec<KeyParameter>& keyParams,
+                             generateKey_cb _hidl_cb) override;
+    Return<void> getKeyCharacteristics(const hidl_vec<uint8_t>& keyBlob,
+                                       const hidl_vec<uint8_t>& clientId,
+                                       const hidl_vec<uint8_t>& appData,
+                                       getKeyCharacteristics_cb _hidl_cb) override;
+    Return<void> importKey(const hidl_vec<KeyParameter>& params, KeyFormat keyFormat,
+                           const hidl_vec<uint8_t>& keyData, importKey_cb _hidl_cb) override;
+    Return<void> importWrappedKey(const hidl_vec<uint8_t>& wrappedKeyData,
+                                  const hidl_vec<uint8_t>& wrappingKeyBlob,
+                                  const hidl_vec<uint8_t>& maskingKey,
+                                  const hidl_vec<KeyParameter>& unwrappingParams,
+                                  uint64_t passwordSid, uint64_t biometricSid,
+                                  importWrappedKey_cb _hidl_cb) override;
+    Return<void> exportKey(KeyFormat exportFormat, const hidl_vec<uint8_t>& keyBlob,
+                           const hidl_vec<uint8_t>& clientId, const hidl_vec<uint8_t>& appData,
+                           exportKey_cb _hidl_cb) override;
+    Return<void> attestKey(const hidl_vec<uint8_t>& keyToAttest,
+                           const hidl_vec<KeyParameter>& attestParams,
+                           attestKey_cb _hidl_cb) override;
+    Return<void> upgradeKey(const hidl_vec<uint8_t>& keyBlobToUpgrade,
+                            const hidl_vec<KeyParameter>& upgradeParams,
+                            upgradeKey_cb _hidl_cb) override;
+    Return<ErrorCode> deleteKey(const hidl_vec<uint8_t>& keyBlob) override;
+    Return<ErrorCode> deleteAllKeys() override;
+    Return<ErrorCode> destroyAttestationIds() override;
+    Return<void> begin(KeyPurpose purpose, const hidl_vec<uint8_t>& key,
+                       const hidl_vec<KeyParameter>& inParams, const HardwareAuthToken& authToken,
+                       begin_cb _hidl_cb) override;
+    Return<void> update(uint64_t operationHandle, const hidl_vec<KeyParameter>& inParams,
+                        const hidl_vec<uint8_t>& input, const HardwareAuthToken& authToken,
+                        const VerificationToken& verificationToken, update_cb _hidl_cb) override;
+    Return<void> finish(uint64_t operationHandle, const hidl_vec<KeyParameter>& inParams,
+                        const hidl_vec<uint8_t>& input, const hidl_vec<uint8_t>& signature,
+                        const HardwareAuthToken& authToken,
+                        const VerificationToken& verificationToken, finish_cb _hidl_cb) override;
+    Return<ErrorCode> abort(uint64_t operationHandle) override;
+
+  private:
+    std::unique_ptr<::keymaster::TrustyKeymaster> impl_;
+};
+
+}  // namespace V4_0
+}  // namespace keymaster
+
+#endif  // keymaster_V4_0_TrustyKeymaster4Device_H_
diff --git a/trusty/trusty-base.mk b/trusty/trusty-base.mk
index 0a0ecec..445d3ce 100644
--- a/trusty/trusty-base.mk
+++ b/trusty/trusty-base.mk
@@ -19,8 +19,13 @@
 # to pull in the baseline set of Trusty specific modules.
 #
 
+# For gatekeeper, we include the generic -service and -impl to use legacy
+# HAL loading of gatekeeper.trusty.
+
 PRODUCT_PACKAGES += \
-	android.hardware.keymaster@3.0-service.trusty \
+	android.hardware.keymaster@4.0-service.trusty \
+	android.hardware.gatekeeper@1.0-service \
+	android.hardware.gatekeeper@1.0-impl \
 	gatekeeper.trusty
 
 PRODUCT_PROPERTY_OVERRIDES += \