diff --git a/debuggerd/libdebuggerd/tombstone.cpp b/debuggerd/libdebuggerd/tombstone.cpp
index 8798ad3..c08afda 100644
--- a/debuggerd/libdebuggerd/tombstone.cpp
+++ b/debuggerd/libdebuggerd/tombstone.cpp
@@ -316,7 +316,7 @@
   std::shared_ptr<unwindstack::Memory>& process_memory = unwinder->GetProcessMemory();
 
   std::string line;
-  for (unwindstack::MapInfo* map_info : *maps) {
+  for (auto const& map_info : *maps) {
     line = "    ";
     if (print_fault_address_marker) {
       if (addr < map_info->start) {
diff --git a/fs_mgr/fs_mgr_remount.cpp b/fs_mgr/fs_mgr_remount.cpp
index 6312734..5c4008c 100644
--- a/fs_mgr/fs_mgr_remount.cpp
+++ b/fs_mgr/fs_mgr_remount.cpp
@@ -263,35 +263,43 @@
 
     // Check verity and optionally setup overlayfs backing.
     auto reboot_later = false;
+    auto uses_overlayfs = fs_mgr_overlayfs_valid() != OverlayfsValidResult::kNotSupported;
     for (auto it = partitions.begin(); it != partitions.end();) {
         auto& entry = *it;
         auto& mount_point = entry.mount_point;
         if (fs_mgr_is_verity_enabled(entry)) {
-            LOG(WARNING) << "Verity enabled on " << mount_point;
-            if (can_reboot &&
-                (android::base::GetProperty("ro.boot.vbmeta.devices_state", "") != "locked")) {
+            retval = VERITY_PARTITION;
+            if (android::base::GetProperty("ro.boot.vbmeta.devices_state", "") != "locked") {
                 if (AvbOps* ops = avb_ops_user_new()) {
                     auto ret = avb_user_verity_set(
                             ops, android::base::GetProperty("ro.boot.slot_suffix", "").c_str(),
                             false);
                     avb_ops_user_free(ops);
                     if (ret) {
-                        if (fs_mgr_overlayfs_valid() == OverlayfsValidResult::kNotSupported) {
-                            retval = VERITY_PARTITION;
+                        LOG(WARNING) << "Disable verity for " << mount_point;
+                        reboot_later = can_reboot;
+                        if (reboot_later) {
                             // w/o overlayfs available, also check for dedupe
-                            reboot_later = true;
-                            ++it;
-                            continue;
+                            if (!uses_overlayfs) {
+                                ++it;
+                                continue;
+                            }
+                            reboot(false);
                         }
-                        reboot(false);
                     } 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)) reboot_later = true;
+                        if (fh && fh.set_verity_status(false)) {
+                            LOG(WARNING) << "Disable verity for " << mount_point;
+                            reboot_later = can_reboot;
+                            if (reboot_later && !uses_overlayfs) {
+                                ++it;
+                                continue;
+                            }
+                        }
                     }
                 }
             }
             LOG(ERROR) << "Skipping " << mount_point;
-            retval = VERITY_PARTITION;
             it = partitions.erase(it);
             continue;
         }
@@ -318,7 +326,8 @@
     }
 
     // Mount overlayfs.
-    if (!fs_mgr_overlayfs_mount_all(&partitions)) {
+    errno = 0;
+    if (!fs_mgr_overlayfs_mount_all(&partitions) && errno) {
         retval = BAD_OVERLAY;
         PLOG(ERROR) << "Can not mount overlayfs for partitions";
     }
@@ -346,11 +355,15 @@
                 break;
             }
             if ((mount_point == "/") && (rentry.mount_point == "/system")) {
-                if (blk_device != "/dev/root") blk_device = rentry.blk_device;
+                blk_device = rentry.blk_device;
                 mount_point = "/system";
                 break;
             }
         }
+        if (blk_device == "/dev/root") {
+            auto from_fstab = GetEntryForMountPoint(&fstab, mount_point);
+            if (from_fstab) blk_device = from_fstab->blk_device;
+        }
         fs_mgr_set_blk_ro(blk_device, false);
 
         // Now remount!
diff --git a/fs_mgr/libfiemap_writer/Android.bp b/fs_mgr/libfiemap_writer/Android.bp
index f4d03ec..7463810 100644
--- a/fs_mgr/libfiemap_writer/Android.bp
+++ b/fs_mgr/libfiemap_writer/Android.bp
@@ -25,6 +25,12 @@
 
     srcs: [
         "fiemap_writer.cpp",
+        "split_fiemap_writer.cpp",
+        "utility.cpp",
+    ],
+
+    static_libs: [
+        "libext4_utils",
     ],
 
     header_libs: [
diff --git a/fs_mgr/libfiemap_writer/fiemap_writer.cpp b/fs_mgr/libfiemap_writer/fiemap_writer.cpp
index 9aa56e1..3d41876 100644
--- a/fs_mgr/libfiemap_writer/fiemap_writer.cpp
+++ b/fs_mgr/libfiemap_writer/fiemap_writer.cpp
@@ -624,8 +624,8 @@
     fmap->fs_type_ = fs_type;
     fmap->block_size_ = blocksz;
 
-    LOG(INFO) << "Successfully created FiemapWriter for file " << abs_path << " on block device "
-              << bdev_path;
+    LOG(VERBOSE) << "Successfully created FiemapWriter for file " << abs_path << " on block device "
+                 << bdev_path;
     return fmap;
 }
 
diff --git a/fs_mgr/libfiemap_writer/fiemap_writer_test.cpp b/fs_mgr/libfiemap_writer/fiemap_writer_test.cpp
index e01a0fb..ab4efae 100644
--- a/fs_mgr/libfiemap_writer/fiemap_writer_test.cpp
+++ b/fs_mgr/libfiemap_writer/fiemap_writer_test.cpp
@@ -33,8 +33,10 @@
 #include <android-base/unique_fd.h>
 #include <gtest/gtest.h>
 #include <libdm/loop_control.h>
-
 #include <libfiemap_writer/fiemap_writer.h>
+#include <libfiemap_writer/split_fiemap_writer.h>
+
+#include "utility.h"
 
 using namespace std;
 using namespace std::string_literals;
@@ -59,6 +61,24 @@
     std::string testfile;
 };
 
+class SplitFiemapTest : public ::testing::Test {
+  protected:
+    void SetUp() override {
+        const ::testing::TestInfo* tinfo = ::testing::UnitTest::GetInstance()->current_test_info();
+        testfile = gTestDir + "/"s + tinfo->name();
+    }
+
+    void TearDown() override {
+        std::string message;
+        if (!SplitFiemap::RemoveSplitFiles(testfile, &message)) {
+            cerr << "Could not remove all split files: " << message;
+        }
+    }
+
+    // name of the file we use for testing
+    std::string testfile;
+};
+
 TEST_F(FiemapWriterTest, CreateImpossiblyLargeFile) {
     // Try creating a file of size ~100TB but aligned to
     // 512 byte to make sure block alignment tests don't
@@ -168,6 +188,52 @@
     EXPECT_EQ(errno, ENOENT);
 }
 
+TEST_F(FiemapWriterTest, MaxBlockSize) {
+    ASSERT_GT(DetermineMaximumFileSize(testfile), 0);
+}
+
+TEST_F(SplitFiemapTest, Create) {
+    auto ptr = SplitFiemap::Create(testfile, 1024 * 768, 1024 * 32);
+    ASSERT_NE(ptr, nullptr);
+
+    auto extents = ptr->extents();
+
+    // Destroy the fiemap, closing file handles. This should not delete them.
+    ptr = nullptr;
+
+    std::vector<std::string> files;
+    ASSERT_TRUE(SplitFiemap::GetSplitFileList(testfile, &files));
+    for (const auto& path : files) {
+        EXPECT_EQ(access(path.c_str(), F_OK), 0);
+    }
+
+    ASSERT_GE(extents.size(), files.size());
+}
+
+TEST_F(SplitFiemapTest, Open) {
+    {
+        auto ptr = SplitFiemap::Create(testfile, 1024 * 768, 1024 * 32);
+        ASSERT_NE(ptr, nullptr);
+    }
+
+    auto ptr = SplitFiemap::Open(testfile);
+    ASSERT_NE(ptr, nullptr);
+
+    auto extents = ptr->extents();
+    ASSERT_GE(extents.size(), 24);
+}
+
+TEST_F(SplitFiemapTest, DeleteOnFail) {
+    auto ptr = SplitFiemap::Create(testfile, 1024 * 1024 * 10, 1);
+    ASSERT_EQ(ptr, nullptr);
+
+    std::string first_file = testfile + ".0001";
+    ASSERT_NE(access(first_file.c_str(), F_OK), 0);
+    ASSERT_EQ(errno, ENOENT);
+    ASSERT_NE(access(testfile.c_str(), F_OK), 0);
+    ASSERT_EQ(errno, ENOENT);
+}
+
 class VerifyBlockWritesExt4 : public ::testing::Test {
     // 2GB Filesystem and 4k block size by default
     static constexpr uint64_t block_size = 4096;
diff --git a/fs_mgr/libfiemap_writer/include/libfiemap_writer/split_fiemap_writer.h b/fs_mgr/libfiemap_writer/include/libfiemap_writer/split_fiemap_writer.h
new file mode 100644
index 0000000..765cc84
--- /dev/null
+++ b/fs_mgr/libfiemap_writer/include/libfiemap_writer/split_fiemap_writer.h
@@ -0,0 +1,79 @@
+/*
+ * 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 <stdint.h>
+
+#include <functional>
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "fiemap_writer.h"
+
+namespace android {
+namespace fiemap_writer {
+
+// Wrapper around FiemapWriter that is able to split images across files if
+// necessary.
+class SplitFiemap final {
+  public:
+    using ProgressCallback = std::function<bool(uint64_t, uint64_t)>;
+
+    // Create a new split fiemap file. If |max_piece_size| is 0, the number of
+    // pieces will be determined automatically by detecting the filesystem.
+    // Otherwise, the file will be split evenly (with the remainder in the
+    // final file).
+    static std::unique_ptr<SplitFiemap> Create(const std::string& file_path, uint64_t file_size,
+                                               uint64_t max_piece_size,
+                                               ProgressCallback progress = {});
+
+    // Open an existing split fiemap file.
+    static std::unique_ptr<SplitFiemap> Open(const std::string& file_path);
+
+    ~SplitFiemap();
+
+    // Return a list of all files created for a split file.
+    static bool GetSplitFileList(const std::string& file_path, std::vector<std::string>* list);
+
+    // Destroy all components of a split file. If the root file does not exist,
+    // this returns true and does not report an error.
+    static bool RemoveSplitFiles(const std::string& file_path, std::string* message = nullptr);
+
+    const std::vector<struct fiemap_extent>& extents();
+    uint32_t block_size() const;
+    uint64_t size() const { return total_size_; }
+
+    // Non-copyable & Non-movable
+    SplitFiemap(const SplitFiemap&) = delete;
+    SplitFiemap& operator=(const SplitFiemap&) = delete;
+    SplitFiemap& operator=(SplitFiemap&&) = delete;
+    SplitFiemap(SplitFiemap&&) = delete;
+
+  private:
+    SplitFiemap() = default;
+    void AddFile(FiemapUniquePtr&& file);
+
+    bool creating_ = false;
+    std::string list_file_;
+    std::vector<FiemapUniquePtr> files_;
+    std::vector<struct fiemap_extent> extents_;
+    uint64_t total_size_ = 0;
+};
+
+}  // namespace fiemap_writer
+}  // namespace android
diff --git a/fs_mgr/libfiemap_writer/split_fiemap_writer.cpp b/fs_mgr/libfiemap_writer/split_fiemap_writer.cpp
new file mode 100644
index 0000000..1f80370
--- /dev/null
+++ b/fs_mgr/libfiemap_writer/split_fiemap_writer.cpp
@@ -0,0 +1,214 @@
+/*
+ * 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 <libfiemap_writer/split_fiemap_writer.h>
+
+#include <fcntl.h>
+#include <stdint.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include <android-base/file.h>
+#include <android-base/logging.h>
+#include <android-base/stringprintf.h>
+#include <android-base/strings.h>
+#include <android-base/unique_fd.h>
+
+#include "utility.h"
+
+namespace android {
+namespace fiemap_writer {
+
+using android::base::unique_fd;
+
+// We use a four-digit suffix at the end of filenames.
+static const size_t kMaxFilePieces = 500;
+
+std::unique_ptr<SplitFiemap> SplitFiemap::Create(const std::string& file_path, uint64_t file_size,
+                                                 uint64_t max_piece_size,
+                                                 ProgressCallback progress) {
+    if (!file_size) {
+        LOG(ERROR) << "Cannot create a fiemap for a 0-length file: " << file_path;
+        return nullptr;
+    }
+
+    if (!max_piece_size) {
+        max_piece_size = DetermineMaximumFileSize(file_path);
+        if (!max_piece_size) {
+            LOG(ERROR) << "Could not determine maximum file size for " << file_path;
+            return nullptr;
+        }
+    }
+
+    // Call |progress| only when the total percentage would significantly change.
+    int permille = -1;
+    uint64_t total_bytes_written = 0;
+    auto on_progress = [&](uint64_t written, uint64_t) -> bool {
+        uint64_t actual_written = total_bytes_written + written;
+        int new_permille = (actual_written * 1000) / file_size;
+        if (new_permille != permille && actual_written < file_size) {
+            if (progress && !progress(actual_written, file_size)) {
+                return false;
+            }
+            permille = new_permille;
+        }
+        return true;
+    };
+
+    std::unique_ptr<SplitFiemap> out(new SplitFiemap());
+    out->creating_ = true;
+    out->list_file_ = file_path;
+
+    // Create the split files.
+    uint64_t remaining_bytes = file_size;
+    while (remaining_bytes) {
+        if (out->files_.size() >= kMaxFilePieces) {
+            LOG(ERROR) << "Requested size " << file_size << " created too many split files";
+            return nullptr;
+        }
+        std::string chunk_path =
+                android::base::StringPrintf("%s.%04d", file_path.c_str(), (int)out->files_.size());
+        uint64_t chunk_size = std::min(max_piece_size, remaining_bytes);
+        auto writer = FiemapWriter::Open(chunk_path, chunk_size, true, on_progress);
+        if (!writer) {
+            return nullptr;
+        }
+
+        // To make sure the alignment doesn't create too much inconsistency, we
+        // account the *actual* size, not the requested size.
+        total_bytes_written += writer->size();
+        remaining_bytes -= writer->size();
+
+        out->AddFile(std::move(writer));
+    }
+
+    // Create the split file list.
+    unique_fd fd(open(out->list_file_.c_str(), O_CREAT | O_WRONLY | O_CLOEXEC, 0660));
+    if (fd < 0) {
+        PLOG(ERROR) << "Failed to open " << file_path;
+        return nullptr;
+    }
+
+    for (const auto& writer : out->files_) {
+        std::string line = android::base::Basename(writer->file_path()) + "\n";
+        if (!android::base::WriteFully(fd, line.data(), line.size())) {
+            PLOG(ERROR) << "Write failed " << file_path;
+            return nullptr;
+        }
+    }
+
+    // Unset this bit, so we don't unlink on destruction.
+    out->creating_ = false;
+    return out;
+}
+
+std::unique_ptr<SplitFiemap> SplitFiemap::Open(const std::string& file_path) {
+    std::vector<std::string> files;
+    if (!GetSplitFileList(file_path, &files)) {
+        return nullptr;
+    }
+
+    std::unique_ptr<SplitFiemap> out(new SplitFiemap());
+    out->list_file_ = file_path;
+
+    for (const auto& file : files) {
+        auto writer = FiemapWriter::Open(file, 0, false);
+        if (!writer) {
+            // Error was logged in Open().
+            return nullptr;
+        }
+        out->AddFile(std::move(writer));
+    }
+    return out;
+}
+
+bool SplitFiemap::GetSplitFileList(const std::string& file_path, std::vector<std::string>* list) {
+    // This is not the most efficient thing, but it is simple and recovering
+    // the fiemap/fibmap is much more expensive.
+    std::string contents;
+    if (!android::base::ReadFileToString(file_path, &contents, true)) {
+        PLOG(ERROR) << "Error reading file: " << file_path;
+        return false;
+    }
+
+    std::vector<std::string> names = android::base::Split(contents, "\n");
+    std::string dir = android::base::Dirname(file_path);
+    for (const auto& name : names) {
+        if (!name.empty()) {
+            list->emplace_back(dir + "/" + name);
+        }
+    }
+    return true;
+}
+
+bool SplitFiemap::RemoveSplitFiles(const std::string& file_path, std::string* message) {
+    // Early exit if this does not exist, and do not report an error.
+    if (access(file_path.c_str(), F_OK) && errno == ENOENT) {
+        return true;
+    }
+
+    bool ok = true;
+    std::vector<std::string> files;
+    if (GetSplitFileList(file_path, &files)) {
+        for (const auto& file : files) {
+            ok &= android::base::RemoveFileIfExists(file, message);
+        }
+    }
+    ok &= android::base::RemoveFileIfExists(file_path, message);
+    return ok;
+}
+
+const std::vector<struct fiemap_extent>& SplitFiemap::extents() {
+    if (extents_.empty()) {
+        for (const auto& file : files_) {
+            const auto& extents = file->extents();
+            extents_.insert(extents_.end(), extents.begin(), extents.end());
+        }
+    }
+    return extents_;
+}
+
+SplitFiemap::~SplitFiemap() {
+    if (!creating_) {
+        return;
+    }
+
+    // We failed to finish creating, so unlink everything.
+    unlink(list_file_.c_str());
+    for (auto&& file : files_) {
+        std::string path = file->file_path();
+        file = nullptr;
+
+        unlink(path.c_str());
+    }
+}
+
+void SplitFiemap::AddFile(FiemapUniquePtr&& file) {
+    total_size_ += file->size();
+    files_.emplace_back(std::move(file));
+}
+
+uint32_t SplitFiemap::block_size() const {
+    return files_[0]->block_size();
+}
+
+}  // namespace fiemap_writer
+}  // namespace android
diff --git a/fs_mgr/libfiemap_writer/utility.cpp b/fs_mgr/libfiemap_writer/utility.cpp
new file mode 100644
index 0000000..192ec16
--- /dev/null
+++ b/fs_mgr/libfiemap_writer/utility.cpp
@@ -0,0 +1,66 @@
+/*
+ * 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 "utility.h"
+
+#include <stdint.h>
+#include <sys/vfs.h>
+#include <unistd.h>
+
+#include <android-base/logging.h>
+#include <libfiemap_writer/fiemap_writer.h>
+
+namespace android {
+namespace fiemap_writer {
+
+uint64_t DetermineMaximumFileSize(const std::string& file_path) {
+    // Create the smallest file possible (one block).
+    auto writer = FiemapWriter::Open(file_path, 1);
+    if (!writer) {
+        return 0;
+    }
+
+    uint64_t result = 0;
+    switch (writer->fs_type()) {
+        case EXT4_SUPER_MAGIC:
+            // The minimum is 16GiB, so just report that. If we wanted we could parse the
+            // superblock and figure out if 64-bit support is enabled.
+            result = 17179869184ULL;
+            break;
+        case F2FS_SUPER_MAGIC:
+            // Formula is from https://www.kernel.org/doc/Documentation/filesystems/f2fs.txt
+            // 4KB * (923 + 2 * 1018 + 2 * 1018 * 1018 + 1018 * 1018 * 1018) := 3.94TB.
+            result = 4329690886144ULL;
+            break;
+        case MSDOS_SUPER_MAGIC:
+            // 4GB-1, which we want aligned to the block size.
+            result = 4294967295;
+            result -= (result % writer->block_size());
+            break;
+        default:
+            LOG(ERROR) << "Unknown file system type: " << writer->fs_type();
+            break;
+    }
+
+    // Close and delete the temporary file.
+    writer = nullptr;
+    unlink(file_path.c_str());
+
+    return result;
+}
+
+}  // namespace fiemap_writer
+}  // namespace android
diff --git a/fs_mgr/libfiemap_writer/utility.h b/fs_mgr/libfiemap_writer/utility.h
new file mode 100644
index 0000000..2d418da
--- /dev/null
+++ b/fs_mgr/libfiemap_writer/utility.h
@@ -0,0 +1,30 @@
+/*
+ * 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 {
+namespace fiemap_writer {
+
+// Given a file that will be created, determine the maximum size its containing
+// filesystem allows. Note this is a theoretical maximum size; free space is
+// ignored entirely.
+uint64_t DetermineMaximumFileSize(const std::string& file_path);
+
+}  // namespace fiemap_writer
+}  // namespace android
diff --git a/fs_mgr/tests/adb-remount-test.sh b/fs_mgr/tests/adb-remount-test.sh
index a6baf1d..bd5a4fe 100755
--- a/fs_mgr/tests/adb-remount-test.sh
+++ b/fs_mgr/tests/adb-remount-test.sh
@@ -48,6 +48,7 @@
 TMPDIR=${TMPDIR:-/tmp}
 print_time=false
 start_time=`date +%s`
+ACTIVE_SLOT=
 
 ##
 ##  Helper Functions
@@ -77,6 +78,7 @@
       wc -l | grep '^1$' >/dev/null
     fi
 }
+
 [ "USAGE: inRecovery
 
 Returns: true if device is in recovery mode" ]
@@ -221,15 +223,23 @@
 
 Returns: waits until the device has returned for adb or optional timeout" ]
 adb_wait() {
+  local ret
   if [ -n "${1}" ]; then
     echo -n ". . . waiting `format_duration ${1}`" ${ANDROID_SERIAL} ${USB_ADDRESS} "${CR}"
     timeout --preserve-status --signal=KILL ${1} adb wait-for-device 2>/dev/null
-    local ret=${?}
+    ret=${?}
     echo -n "                                                                             ${CR}"
-    return ${ret}
   else
     adb wait-for-device
+    ret=${?}
   fi
+  if [ 0 = ${ret} -a -n "${ACTIVE_SLOT}" ]; then
+    local active_slot=`get_active_slot`
+    if [ X"${ACTIVE_SLOT}" != X"${active_slot}" ]; then
+      echo "${ORANGE}[  WARNING ]${NORMAL} Active slot changed from ${ACTIVE_SLOT} to ${active_slot}" >&2
+    fi
+  fi
+  return ${ret}
 }
 
 [ "USAGE: usb_status > stdout
@@ -254,33 +264,50 @@
 
 Returns: waits until the device has returned for fastboot or optional timeout" ]
 fastboot_wait() {
+  local ret
   # fastboot has no wait-for-device, but it does an automatic
   # wait and requires (even a nonsensical) command to do so.
   if [ -n "${1}" ]; then
     echo -n ". . . waiting `format_duration ${1}`" ${ANDROID_SERIAL} ${USB_ADDRESS} "${CR}"
     timeout --preserve-status --signal=KILL ${1} fastboot wait-for-device >/dev/null 2>/dev/null
-    local ret=${?}
+    ret=${?}
     echo -n "                                                                             ${CR}"
     ( exit ${ret} )
   else
     fastboot wait-for-device >/dev/null 2>/dev/null
   fi ||
     inFastboot
+  ret=${?}
+  if [ 0 = ${ret} -a -n "${ACTIVE_SLOT}" ]; then
+    local active_slot=`get_active_slot`
+    if [ X"${ACTIVE_SLOT}" != X"${active_slot}" ]; then
+      echo "${ORANGE}[  WARNING ]${NORMAL} Active slot changed from ${ACTIVE_SLOT} to ${active_slot}" >&2
+    fi
+  fi
+  return ${ret}
 }
 
 [ "USAGE: recovery_wait [timeout]
 
 Returns: waits until the device has returned for recovery or optional timeout" ]
 recovery_wait() {
+  local ret
   if [ -n "${1}" ]; then
     echo -n ". . . waiting `format_duration ${1}`" ${ANDROID_SERIAL} ${USB_ADDRESS} "${CR}"
     timeout --preserve-status --signal=KILL ${1} adb wait-for-recovery 2>/dev/null
-    local ret=${?}
+    ret=${?}
     echo -n "                                                                             ${CR}"
-    return ${ret}
   else
     adb wait-for-recovery
+    ret=${?}
   fi
+  if [ 0 = ${ret} -a -n "${ACTIVE_SLOT}" ]; then
+    local active_slot=`get_active_slot`
+    if [ X"${ACTIVE_SLOT}" != X"${active_slot}" ]; then
+      echo "${ORANGE}[  WARNING ]${NORMAL} Active slot changed from ${ACTIVE_SLOT} to ${active_slot}" >&2
+    fi
+  fi
+  return ${ret}
 }
 
 [ "any_wait [timeout]
@@ -326,7 +353,7 @@
     [ root != "`adb_sh echo '${USER}' </dev/null`" ]
 }
 
-[ "USAGE: fastboot_getvar var expected
+[ "USAGE: fastboot_getvar var expected >/dev/stderr
 
 Returns: true if var output matches expected" ]
 fastboot_getvar() {
@@ -350,6 +377,19 @@
   echo ${O} >&2
 }
 
+[ "USAGE: get_active_slot >/dev/stdout
+
+Returns: with a or b string reporting active slot" ]
+get_active_slot() {
+  if inAdb || inRecovery; then
+    get_property ro.boot.slot_suffix | tr -d _
+  elif inFastboot; then
+    fastboot_getvar current-slot 2>&1 | sed -n 's/current-slot: //p'
+  else
+    false
+  fi
+}
+
 [ "USAGE: restore
 
 Do nothing: should be redefined when necessary.  Called after cleanup.
@@ -583,6 +623,9 @@
 BUILD_DESCRIPTION=`get_property ro.build.description`
 [ -z "${BUILD_DESCRIPTION}" ] ||
   echo "${BLUE}[     INFO ]${NORMAL} ${BUILD_DESCRIPTION}" >&2
+ACTIVE_SLOT=`get_active_slot`
+[ -z "${ACTIVE_SLOT}" ] ||
+  echo "${BLUE}[     INFO ]${NORMAL} active slot is ${ACTIVE_SLOT}" >&2
 
 # Report existing partition sizes
 adb_sh ls -l /dev/block/by-name/ </dev/null 2>/dev/null |
@@ -1031,13 +1074,7 @@
   check_eq "${A}" "${B}" system after flash vendor
   adb_root ||
     die "adb root"
-  B="`adb_cat /vendor/hello`" &&
-    if ${is_userspace_fastboot} || ! ${overlayfs_needed}; then
-      die "re-read /vendor/hello after flash vendor"
-    else
-      echo "${ORANGE}[  WARNING ]${NORMAL} user fastboot missing required to invalidate, ignoring a failure" >&2
-      echo "${ORANGE}[  WARNING ]${NORMAL} re-read /vendor/hello after flash vendor" >&2
-    fi
+  B="`adb_cat /vendor/hello`"
   if ${is_userspace_fastboot} || ! ${overlayfs_needed}; then
     check_eq "cat: /vendor/hello: No such file or directory" "${B}" \
              vendor content after flash vendor
diff --git a/gatekeeperd/Android.bp b/gatekeeperd/Android.bp
index 8e9c7ea..2b7db79 100644
--- a/gatekeeperd/Android.bp
+++ b/gatekeeperd/Android.bp
@@ -31,6 +31,7 @@
     shared_libs: [
         "libbinder",
         "libgatekeeper",
+        "libgsi",
         "liblog",
         "libhardware",
         "libbase",
diff --git a/gatekeeperd/gatekeeperd.cpp b/gatekeeperd/gatekeeperd.cpp
index 446b66e..8700c34 100644
--- a/gatekeeperd/gatekeeperd.cpp
+++ b/gatekeeperd/gatekeeperd.cpp
@@ -26,6 +26,8 @@
 #include <memory>
 
 #include <android/security/keystore/IKeystoreService.h>
+#include <android-base/logging.h>
+#include <android-base/properties.h>
 #include <binder/IPCThreadState.h>
 #include <binder/IServiceManager.h>
 #include <binder/PermissionCache.h>
@@ -34,6 +36,7 @@
 #include <hardware/hw_auth_token.h>
 #include <keystore/keystore.h> // For error code
 #include <keystore/keystore_return_types.h>
+#include <libgsi/libgsi.h>
 #include <log/log.h>
 #include <utils/Log.h>
 #include <utils/String16.h>
@@ -59,6 +62,7 @@
     GateKeeperProxy() {
         clear_state_if_needed_done = false;
         hw_device = IGatekeeper::getService();
+        is_running_gsi = android::base::GetBoolProperty(android::gsi::kGsiBootedProp, false);
 
         if (hw_device == nullptr) {
             ALOGW("falling back to software GateKeeper");
@@ -86,7 +90,7 @@
             return;
         }
 
-        if (mark_cold_boot()) {
+        if (mark_cold_boot() && !is_running_gsi) {
             ALOGI("cold boot: clearing state");
             if (hw_device != nullptr) {
                 hw_device->deleteAllUsers([](const GatekeeperResponse &){});
@@ -138,6 +142,18 @@
         }
     }
 
+    // This should only be called on uids being passed to the GateKeeper HAL. It ensures that
+    // secure storage shared across a GSI image and a host image will not overlap.
+    uint32_t adjust_uid(uint32_t uid) {
+        static constexpr uint32_t kGsiOffset = 1000000;
+        CHECK(uid < kGsiOffset);
+        CHECK(hw_device != nullptr);
+        if (is_running_gsi) {
+            return uid + kGsiOffset;
+        }
+        return uid;
+    }
+
     virtual int enroll(uint32_t uid,
             const uint8_t *current_password_handle, uint32_t current_password_handle_length,
             const uint8_t *current_password, uint32_t current_password_length,
@@ -181,7 +197,8 @@
             newPwd.setToExternal(const_cast<uint8_t*>(desired_password),
                                  desired_password_length);
 
-            Return<void> hwRes = hw_device->enroll(uid, curPwdHandle, curPwd, newPwd,
+            uint32_t hw_uid = adjust_uid(uid);
+            Return<void> hwRes = hw_device->enroll(hw_uid, curPwdHandle, curPwd, newPwd,
                               [&ret, enrolled_password_handle, enrolled_password_handle_length]
                                    (const GatekeeperResponse &rsp) {
                 ret = static_cast<int>(rsp.code); // propagate errors
@@ -266,13 +283,14 @@
             // handle version 0 does not have hardware backed flag, and thus cannot be upgraded to
             // a HAL if there was none before
             if (handle->version == 0 || handle->hardware_backed) {
+                uint32_t hw_uid = adjust_uid(uid);
                 android::hardware::hidl_vec<uint8_t> curPwdHandle;
                 curPwdHandle.setToExternal(const_cast<uint8_t*>(enrolled_password_handle),
                                            enrolled_password_handle_length);
                 android::hardware::hidl_vec<uint8_t> enteredPwd;
                 enteredPwd.setToExternal(const_cast<uint8_t*>(provided_password),
                                          provided_password_length);
-                Return<void> hwRes = hw_device->verify(uid, challenge, curPwdHandle, enteredPwd,
+                Return<void> hwRes = hw_device->verify(hw_uid, challenge, curPwdHandle, enteredPwd,
                                         [&ret, request_reenroll, auth_token, auth_token_length]
                                              (const GatekeeperResponse &rsp) {
                     ret = static_cast<int>(rsp.code); // propagate errors
@@ -354,7 +372,8 @@
         clear_sid(uid);
 
         if (hw_device != nullptr) {
-            hw_device->deleteUser(uid, [] (const GatekeeperResponse &){});
+            uint32_t hw_uid = adjust_uid(uid);
+            hw_device->deleteUser(hw_uid, [] (const GatekeeperResponse &){});
         }
     }
 
@@ -394,6 +413,7 @@
     std::unique_ptr<SoftGateKeeperDevice> soft_device;
 
     bool clear_state_if_needed_done;
+    bool is_running_gsi;
 };
 }// namespace android
 
diff --git a/init/Android.bp b/init/Android.bp
index 639d8d1..9aeb837 100644
--- a/init/Android.bp
+++ b/init/Android.bp
@@ -132,7 +132,7 @@
         "ueventd_parser.cpp",
         "util.cpp",
     ],
-    whole_static_libs: ["libcap"],
+    whole_static_libs: ["libcap", "com.android.sysprop.apex"],
     header_libs: ["bootimg_headers"],
     proto: {
         type: "lite",
diff --git a/init/Android.mk b/init/Android.mk
index 59d7f11..ac05542 100644
--- a/init/Android.mk
+++ b/init/Android.mk
@@ -93,6 +93,7 @@
     libselinux \
     libcap \
     libgsi \
+    libcom.android.sysprop.apex \
 
 LOCAL_SANITIZE := signed-integer-overflow
 # First stage init is weird: it may start without stdout/stderr, and no /proc.
diff --git a/init/mount_namespace.cpp b/init/mount_namespace.cpp
index 327446a..4161df2 100644
--- a/init/mount_namespace.cpp
+++ b/init/mount_namespace.cpp
@@ -21,6 +21,7 @@
 #include <string>
 #include <vector>
 
+#include <ApexProperties.sysprop.h>
 #include <android-base/file.h>
 #include <android-base/logging.h>
 #include <android-base/properties.h>
@@ -132,9 +133,9 @@
     return true;
 }
 
-static bool IsBionicUpdatable() {
-    static bool result = android::base::GetBoolProperty("ro.apex.IsBionicUpdatable", false);
-    return result;
+static bool IsApexUpdatable() {
+    static bool updatable = android::sysprop::ApexProperties::updatable().value_or(false);
+    return updatable;
 }
 
 static android::base::unique_fd bootstrap_ns_fd;
@@ -187,7 +188,7 @@
     // bind-mounted. In the namespace for post-apexd processes, the bionic from
     // the runtime APEX is bind-mounted.
     bool success = true;
-    if (IsBionicUpdatable() && !IsRecoveryMode()) {
+    if (IsApexUpdatable() && !IsRecoveryMode()) {
         // Creating a new namespace by cloning, saving, and switching back to
         // the original namespace.
         if (unshare(CLONE_NEWNS) == -1) {
@@ -244,7 +245,7 @@
         return true;
     }
     // Bind-mount bionic from the runtime APEX since it is now available. Note
-    // that in case of IsBionicUpdatable() == false, these mounts are over the
+    // that in case of IsApexUpdatable() == false, these mounts are over the
     // existing existing bind mounts for the bootstrap bionic, which effectively
     // becomes hidden.
     if (!BindMountBionic(kRuntimeLinkerPath, kRuntimeBionicLibsDir, kLinkerMountPoint,
@@ -264,7 +265,7 @@
         return true;
     }
     if (bootstrap_ns_id != GetMountNamespaceId() && bootstrap_ns_fd.get() != -1 &&
-        IsBionicUpdatable()) {
+        IsApexUpdatable()) {
         if (setns(bootstrap_ns_fd.get(), CLONE_NEWNS) == -1) {
             PLOG(ERROR) << "Failed to switch to bootstrap mount namespace.";
             return false;
diff --git a/libbacktrace/UnwindStackMap.cpp b/libbacktrace/UnwindStackMap.cpp
index 9d15af2..4518891 100644
--- a/libbacktrace/UnwindStackMap.cpp
+++ b/libbacktrace/UnwindStackMap.cpp
@@ -55,7 +55,7 @@
   }
 
   // Iterate through the maps and fill in the backtrace_map_t structure.
-  for (auto* map_info : *stack_maps_) {
+  for (const auto& map_info : *stack_maps_) {
     backtrace_map_t map;
     map.start = map_info->start;
     map.end = map_info->end;
diff --git a/libunwindstack/Global.cpp b/libunwindstack/Global.cpp
index fdfd705..a20be00 100644
--- a/libunwindstack/Global.cpp
+++ b/libunwindstack/Global.cpp
@@ -77,7 +77,7 @@
   //   f0000-f2000 0 r-- /system/lib/libc.so
   //   f2000-f3000 2000 rw- /system/lib/libc.so
   MapInfo* map_start = nullptr;
-  for (MapInfo* info : *maps) {
+  for (const auto& info : *maps) {
     if (map_start != nullptr) {
       if (map_start->name == info->name) {
         if (info->offset != 0 &&
@@ -96,7 +96,7 @@
     }
     if (map_start == nullptr && (info->flags & PROT_READ) && info->offset == 0 &&
         !info->name.empty()) {
-      map_start = info;
+      map_start = info.get();
     }
   }
 }
diff --git a/libunwindstack/Maps.cpp b/libunwindstack/Maps.cpp
index 1e4f72e..5da73e4 100644
--- a/libunwindstack/Maps.cpp
+++ b/libunwindstack/Maps.cpp
@@ -47,9 +47,9 @@
   size_t last = maps_.size();
   while (first < last) {
     size_t index = (first + last) / 2;
-    MapInfo* cur = maps_[index];
+    const auto& cur = maps_[index];
     if (pc >= cur->start && pc < cur->end) {
-      return cur;
+      return cur.get();
     } else if (pc < cur->start) {
       last = index;
     } else {
@@ -67,34 +67,31 @@
         if (strncmp(name, "/dev/", 5) == 0 && strncmp(name + 5, "ashmem/", 7) != 0) {
           flags |= unwindstack::MAPS_FLAGS_DEVICE_MAP;
         }
-        maps_.push_back(
-            new MapInfo(maps_.empty() ? nullptr : maps_.back(), start, end, pgoff, flags, name));
+        maps_.emplace_back(
+            new MapInfo(maps_.empty() ? nullptr : maps_.back().get(), start, end, pgoff,
+                        flags, name));
       });
 }
 
 void Maps::Add(uint64_t start, uint64_t end, uint64_t offset, uint64_t flags,
                const std::string& name, uint64_t load_bias) {
-  MapInfo* map_info =
-      new MapInfo(maps_.empty() ? nullptr : maps_.back(), start, end, offset, flags, name);
+  auto map_info =
+      std::make_unique<MapInfo>(maps_.empty() ? nullptr : maps_.back().get(), start, end, offset,
+                                flags, name);
   map_info->load_bias = load_bias;
-  maps_.push_back(map_info);
+  maps_.emplace_back(std::move(map_info));
 }
 
 void Maps::Sort() {
   std::sort(maps_.begin(), maps_.end(),
-            [](const MapInfo* a, const MapInfo* b) { return a->start < b->start; });
+            [](const std::unique_ptr<MapInfo>& a, const std::unique_ptr<MapInfo>& b) {
+              return a->start < b->start; });
 
   // Set the prev_map values on the info objects.
   MapInfo* prev_map = nullptr;
-  for (MapInfo* map_info : maps_) {
+  for (const auto& map_info : maps_) {
     map_info->prev_map = prev_map;
-    prev_map = map_info;
-  }
-}
-
-Maps::~Maps() {
-  for (auto& map : maps_) {
-    delete map;
+    prev_map = map_info.get();
   }
 }
 
@@ -107,8 +104,9 @@
         if (strncmp(name, "/dev/", 5) == 0 && strncmp(name + 5, "ashmem/", 7) != 0) {
           flags |= unwindstack::MAPS_FLAGS_DEVICE_MAP;
         }
-        maps_.push_back(
-            new MapInfo(maps_.empty() ? nullptr : maps_.back(), start, end, pgoff, flags, name));
+        maps_.emplace_back(
+            new MapInfo(maps_.empty() ? nullptr : maps_.back().get(), start, end, pgoff,
+                        flags, name));
       });
 }
 
@@ -124,10 +122,6 @@
   // New maps will be added at the end without deleting the old ones.
   size_t last_map_idx = maps_.size();
   if (!Parse()) {
-    // Delete any maps added by the Parse call.
-    for (size_t i = last_map_idx; i < maps_.size(); i++) {
-      delete maps_[i];
-    }
     maps_.resize(last_map_idx);
     return false;
   }
@@ -135,17 +129,16 @@
   size_t total_entries = maps_.size();
   size_t search_map_idx = 0;
   for (size_t new_map_idx = last_map_idx; new_map_idx < maps_.size(); new_map_idx++) {
-    MapInfo* new_map_info = maps_[new_map_idx];
+    auto& new_map_info = maps_[new_map_idx];
     uint64_t start = new_map_info->start;
     uint64_t end = new_map_info->end;
     uint64_t flags = new_map_info->flags;
     std::string* name = &new_map_info->name;
     for (size_t old_map_idx = search_map_idx; old_map_idx < last_map_idx; old_map_idx++) {
-      MapInfo* info = maps_[old_map_idx];
+      auto& info = maps_[old_map_idx];
       if (start == info->start && end == info->end && flags == info->flags && *name == info->name) {
         // No need to check
         search_map_idx = old_map_idx + 1;
-        delete new_map_info;
         maps_[new_map_idx] = nullptr;
         total_entries--;
         break;
@@ -158,7 +151,7 @@
       // Never delete these maps, they may be in use. The assumption is
       // that there will only every be a handfull of these so waiting
       // to destroy them is not too expensive.
-      saved_maps_.push_back(info);
+      saved_maps_.emplace_back(std::move(info));
       maps_[old_map_idx] = nullptr;
       total_entries--;
     }
@@ -169,14 +162,14 @@
 
   // Now move out any of the maps that never were found.
   for (size_t i = search_map_idx; i < last_map_idx; i++) {
-    saved_maps_.push_back(maps_[i]);
+    saved_maps_.emplace_back(std::move(maps_[i]));
     maps_[i] = nullptr;
     total_entries--;
   }
 
   // Sort all of the values such that the nullptrs wind up at the end, then
   // resize them away.
-  std::sort(maps_.begin(), maps_.end(), [](const auto* a, const auto* b) {
+  std::sort(maps_.begin(), maps_.end(), [](const auto& a, const auto& b) {
     if (a == nullptr) {
       return false;
     } else if (b == nullptr) {
@@ -189,10 +182,4 @@
   return true;
 }
 
-LocalUpdatableMaps::~LocalUpdatableMaps() {
-  for (auto map_info : saved_maps_) {
-    delete map_info;
-  }
-}
-
 }  // namespace unwindstack
diff --git a/libunwindstack/benchmarks/unwind_benchmarks.cpp b/libunwindstack/benchmarks/unwind_benchmarks.cpp
index 8caecc7..de9137a 100644
--- a/libunwindstack/benchmarks/unwind_benchmarks.cpp
+++ b/libunwindstack/benchmarks/unwind_benchmarks.cpp
@@ -92,9 +92,9 @@
 
   // Find the libc.so share library and use that for benchmark purposes.
   *build_id_map_info = nullptr;
-  for (unwindstack::MapInfo* map_info : maps) {
+  for (auto& map_info : maps) {
     if (map_info->offset == 0 && map_info->GetBuildID() != "") {
-      *build_id_map_info = map_info;
+      *build_id_map_info = map_info.get();
       break;
     }
   }
diff --git a/libunwindstack/include/unwindstack/Maps.h b/libunwindstack/include/unwindstack/Maps.h
index 67fbed2..1784394 100644
--- a/libunwindstack/include/unwindstack/Maps.h
+++ b/libunwindstack/include/unwindstack/Maps.h
@@ -20,6 +20,7 @@
 #include <sys/types.h>
 #include <unistd.h>
 
+#include <memory>
 #include <string>
 #include <vector>
 
@@ -37,8 +38,16 @@
 
 class Maps {
  public:
+  virtual ~Maps() = default;
+
   Maps() = default;
-  virtual ~Maps();
+
+  // Maps are not copyable but movable, because they own pointers to MapInfo
+  // objects.
+  Maps(const Maps&) = delete;
+  Maps& operator=(const Maps&) = delete;
+  Maps(Maps&&) = default;
+  Maps& operator=(Maps&&) = default;
 
   MapInfo* Find(uint64_t pc);
 
@@ -51,11 +60,11 @@
 
   void Sort();
 
-  typedef std::vector<MapInfo*>::iterator iterator;
+  typedef std::vector<std::unique_ptr<MapInfo>>::iterator iterator;
   iterator begin() { return maps_.begin(); }
   iterator end() { return maps_.end(); }
 
-  typedef std::vector<MapInfo*>::const_iterator const_iterator;
+  typedef std::vector<std::unique_ptr<MapInfo>>::const_iterator const_iterator;
   const_iterator begin() const { return maps_.begin(); }
   const_iterator end() const { return maps_.end(); }
 
@@ -63,11 +72,11 @@
 
   MapInfo* Get(size_t index) {
     if (index >= maps_.size()) return nullptr;
-    return maps_[index];
+    return maps_[index].get();
   }
 
  protected:
-  std::vector<MapInfo*> maps_;
+  std::vector<std::unique_ptr<MapInfo>> maps_;
 };
 
 class RemoteMaps : public Maps {
@@ -90,14 +99,14 @@
 class LocalUpdatableMaps : public Maps {
  public:
   LocalUpdatableMaps() : Maps() {}
-  virtual ~LocalUpdatableMaps();
+  virtual ~LocalUpdatableMaps() = default;
 
   bool Reparse();
 
   const std::string GetMapsFile() const override;
 
  private:
-  std::vector<MapInfo*> saved_maps_;
+  std::vector<std::unique_ptr<MapInfo>> saved_maps_;
 };
 
 class BufferMaps : public Maps {
diff --git a/libunwindstack/tests/MapsTest.cpp b/libunwindstack/tests/MapsTest.cpp
index b4197f2..9e7a6ab 100644
--- a/libunwindstack/tests/MapsTest.cpp
+++ b/libunwindstack/tests/MapsTest.cpp
@@ -61,6 +61,26 @@
   ASSERT_EQ(0U, info->load_bias.load());
 }
 
+TEST(MapsTest, map_move) {
+  Maps maps;
+
+  maps.Add(0x1000, 0x2000, 0, PROT_READ, "fake_map", 0);
+  maps.Add(0x3000, 0x4000, 0x10, 0, "", 0x1234);
+  maps.Add(0x5000, 0x6000, 1, 2, "fake_map2", static_cast<uint64_t>(-1));
+
+  Maps maps2 = std::move(maps);
+
+  ASSERT_EQ(3U, maps2.Total());
+  MapInfo* info = maps2.Get(0);
+  ASSERT_EQ(0x1000U, info->start);
+  ASSERT_EQ(0x2000U, info->end);
+  ASSERT_EQ(0U, info->offset);
+  ASSERT_EQ(PROT_READ, info->flags);
+  ASSERT_EQ("fake_map", info->name);
+  ASSERT_EQ(0U, info->elf_offset);
+  ASSERT_EQ(0U, info->load_bias.load());
+}
+
 TEST(MapsTest, verify_parse_line) {
   MapInfo info(nullptr, 0, 0, 0, 0, "");
 
diff --git a/libunwindstack/tests/UnwinderTest.cpp b/libunwindstack/tests/UnwinderTest.cpp
index d88531f..2dc5118 100644
--- a/libunwindstack/tests/UnwinderTest.cpp
+++ b/libunwindstack/tests/UnwinderTest.cpp
@@ -49,7 +49,7 @@
     std::string str_name(name);
     maps_->Add(start, end, offset, flags, name, static_cast<uint64_t>(-1));
     if (elf != nullptr) {
-      MapInfo* map_info = *--maps_->end();
+      const auto& map_info = *--maps_->end();
       map_info->elf.reset(elf);
     }
   }
@@ -85,7 +85,7 @@
     AddMapInfo(0x53000, 0x54000, 0, PROT_READ | PROT_WRITE, "/fake/fake.oat");
 
     AddMapInfo(0xa3000, 0xa4000, 0, PROT_READ | PROT_WRITE | PROT_EXEC, "/fake/fake.vdex");
-    MapInfo* info = *--maps_->end();
+    const auto& info = *--maps_->end();
     info->load_bias = 0;
 
     elf = new ElfFake(new MemoryFake);
@@ -98,8 +98,8 @@
     elf->FakeSetInterface(new ElfInterfaceFake(nullptr));
     AddMapInfo(0xa7000, 0xa8000, 0, PROT_READ | PROT_WRITE | PROT_EXEC, "/fake/fake_offset.oat",
                elf);
-    info = *--maps_->end();
-    info->elf_offset = 0x8000;
+    const auto& info2 = *--maps_->end();
+    info2->elf_offset = 0x8000;
 
     process_memory_.reset(new MemoryFake);
   }
diff --git a/mkbootimg/unpack_bootimg.py b/mkbootimg/unpack_bootimg.py
index 6b5d5d0..36a5f9f 100755
--- a/mkbootimg/unpack_bootimg.py
+++ b/mkbootimg/unpack_bootimg.py
@@ -103,10 +103,11 @@
                                  ) # header + kernel
     image_info_list.append((ramdisk_offset, ramdisk_size, 'ramdisk'))
 
-    second_offset = page_size * (
-        num_header_pages + num_kernel_pages + num_ramdisk_pages
-    )  # header + kernel + ramdisk
-    image_info_list.append((second_offset, second_size, 'second'))
+    if second_size > 0:
+        second_offset = page_size * (
+                num_header_pages + num_kernel_pages + num_ramdisk_pages
+                )  # header + kernel + ramdisk
+        image_info_list.append((second_offset, second_size, 'second'))
 
     if recovery_dtbo_size > 0:
         image_info_list.append((recovery_dtbo_offset, recovery_dtbo_size,
diff --git a/trusty/storage/proxy/proxy.c b/trusty/storage/proxy/proxy.c
index 41263e5..9a71ae3 100644
--- a/trusty/storage/proxy/proxy.c
+++ b/trusty/storage/proxy/proxy.c
@@ -17,8 +17,8 @@
 #include <getopt.h>
 #include <stdbool.h>
 #include <stdint.h>
-#include <string.h>
 #include <stdlib.h>
+#include <string.h>
 #include <sys/capability.h>
 #include <sys/prctl.h>
 #include <sys/stat.h>
@@ -34,28 +34,24 @@
 #define REQ_BUFFER_SIZE 4096
 static uint8_t req_buffer[REQ_BUFFER_SIZE + 1];
 
-static const char *ss_data_root;
-static const char *trusty_devname;
-static const char *rpmb_devname;
-static const char *ss_srv_name = STORAGE_DISK_PROXY_PORT;
+static const char* ss_data_root;
+static const char* trusty_devname;
+static const char* rpmb_devname;
+static const char* ss_srv_name = STORAGE_DISK_PROXY_PORT;
 
-static const char *_sopts = "hp:d:r:";
-static const struct option _lopts[] =  {
-    {"help",       no_argument,       NULL, 'h'},
-    {"trusty_dev", required_argument, NULL, 'd'},
-    {"data_path",  required_argument, NULL, 'p'},
-    {"rpmb_dev",   required_argument, NULL, 'r'},
-    {0, 0, 0, 0}
-};
+static const char* _sopts = "hp:d:r:";
+static const struct option _lopts[] = {{"help", no_argument, NULL, 'h'},
+                                       {"trusty_dev", required_argument, NULL, 'd'},
+                                       {"data_path", required_argument, NULL, 'p'},
+                                       {"rpmb_dev", required_argument, NULL, 'r'},
+                                       {0, 0, 0, 0}};
 
-static void show_usage_and_exit(int code)
-{
+static void show_usage_and_exit(int code) {
     ALOGE("usage: storageproxyd -d <trusty_dev> -p <data_path> -r <rpmb_dev>\n");
     exit(code);
 }
 
-static int drop_privs(void)
-{
+static int drop_privs(void) {
     struct __user_cap_header_struct capheader;
     struct __user_cap_data_struct capdata[2];
 
@@ -95,12 +91,10 @@
     return 0;
 }
 
-static int handle_req(struct storage_msg *msg, const void *req, size_t req_len)
-{
+static int handle_req(struct storage_msg* msg, const void* req, size_t req_len) {
     int rc;
 
-    if ((msg->flags & STORAGE_MSG_FLAG_POST_COMMIT) &&
-        (msg->cmd != STORAGE_RPMB_SEND)) {
+    if ((msg->flags & STORAGE_MSG_FLAG_POST_COMMIT) && (msg->cmd != STORAGE_RPMB_SEND)) {
         /*
          * handling post commit messages on non rpmb commands are not
          * implemented as there is no use case for this yet.
@@ -119,42 +113,42 @@
     }
 
     switch (msg->cmd) {
-    case STORAGE_FILE_DELETE:
-        rc = storage_file_delete(msg, req, req_len);
-        break;
+        case STORAGE_FILE_DELETE:
+            rc = storage_file_delete(msg, req, req_len);
+            break;
 
-    case STORAGE_FILE_OPEN:
-        rc = storage_file_open(msg, req, req_len);
-        break;
+        case STORAGE_FILE_OPEN:
+            rc = storage_file_open(msg, req, req_len);
+            break;
 
-    case STORAGE_FILE_CLOSE:
-        rc = storage_file_close(msg, req, req_len);
-        break;
+        case STORAGE_FILE_CLOSE:
+            rc = storage_file_close(msg, req, req_len);
+            break;
 
-    case STORAGE_FILE_WRITE:
-        rc = storage_file_write(msg, req, req_len);
-        break;
+        case STORAGE_FILE_WRITE:
+            rc = storage_file_write(msg, req, req_len);
+            break;
 
-    case STORAGE_FILE_READ:
-        rc = storage_file_read(msg, req, req_len);
-        break;
+        case STORAGE_FILE_READ:
+            rc = storage_file_read(msg, req, req_len);
+            break;
 
-    case STORAGE_FILE_GET_SIZE:
-        rc = storage_file_get_size(msg, req, req_len);
-        break;
+        case STORAGE_FILE_GET_SIZE:
+            rc = storage_file_get_size(msg, req, req_len);
+            break;
 
-    case STORAGE_FILE_SET_SIZE:
-        rc = storage_file_set_size(msg, req, req_len);
-        break;
+        case STORAGE_FILE_SET_SIZE:
+            rc = storage_file_set_size(msg, req, req_len);
+            break;
 
-    case STORAGE_RPMB_SEND:
-        rc = rpmb_send(msg, req, req_len);
-        break;
+        case STORAGE_RPMB_SEND:
+            rc = rpmb_send(msg, req, req_len);
+            break;
 
-    default:
-        ALOGE("unhandled command 0x%x\n", msg->cmd);
-        msg->result = STORAGE_ERR_UNIMPLEMENTED;
-        rc = 1;
+        default:
+            ALOGE("unhandled command 0x%x\n", msg->cmd);
+            msg->result = STORAGE_ERR_UNIMPLEMENTED;
+            rc = 1;
     }
 
     if (rc > 0) {
@@ -164,58 +158,50 @@
     return rc;
 }
 
-static int proxy_loop(void)
-{
+static int proxy_loop(void) {
     ssize_t rc;
     struct storage_msg msg;
 
     /* enter main message handling loop */
     while (true) {
-
         /* get incoming message */
         rc = ipc_get_msg(&msg, req_buffer, REQ_BUFFER_SIZE);
-        if (rc < 0)
-            return rc;
+        if (rc < 0) return rc;
 
         /* handle request */
         req_buffer[rc] = 0; /* force zero termination */
         rc = handle_req(&msg, req_buffer, rc);
-        if (rc)
-            return rc;
+        if (rc) return rc;
     }
 
     return 0;
 }
 
-static void parse_args(int argc, char *argv[])
-{
+static void parse_args(int argc, char* argv[]) {
     int opt;
     int oidx = 0;
 
     while ((opt = getopt_long(argc, argv, _sopts, _lopts, &oidx)) != -1) {
         switch (opt) {
+            case 'd':
+                trusty_devname = strdup(optarg);
+                break;
 
-        case 'd':
-            trusty_devname = strdup(optarg);
-            break;
+            case 'p':
+                ss_data_root = strdup(optarg);
+                break;
 
-        case 'p':
-            ss_data_root = strdup(optarg);
-            break;
+            case 'r':
+                rpmb_devname = strdup(optarg);
+                break;
 
-        case 'r':
-            rpmb_devname = strdup(optarg);
-            break;
-
-        default:
-            ALOGE("unrecognized option (%c):\n", opt);
-            show_usage_and_exit(EXIT_FAILURE);
+            default:
+                ALOGE("unrecognized option (%c):\n", opt);
+                show_usage_and_exit(EXIT_FAILURE);
         }
     }
 
-    if (ss_data_root == NULL ||
-        trusty_devname == NULL ||
-        rpmb_devname == NULL) {
+    if (ss_data_root == NULL || trusty_devname == NULL || rpmb_devname == NULL) {
         ALOGE("missing required argument(s)\n");
         show_usage_and_exit(EXIT_FAILURE);
     }
@@ -226,31 +212,26 @@
     ALOGI("rpmb dev: %s\n", rpmb_devname);
 }
 
-int main(int argc, char *argv[])
-{
+int main(int argc, char* argv[]) {
     int rc;
 
     /* drop privileges */
-    if (drop_privs() < 0)
-        return EXIT_FAILURE;
+    if (drop_privs() < 0) return EXIT_FAILURE;
 
     /* parse arguments */
     parse_args(argc, argv);
 
     /* initialize secure storage directory */
     rc = storage_init(ss_data_root);
-    if (rc < 0)
-        return EXIT_FAILURE;
+    if (rc < 0) return EXIT_FAILURE;
 
     /* open rpmb device */
     rc = rpmb_open(rpmb_devname);
-    if (rc < 0)
-        return EXIT_FAILURE;
+    if (rc < 0) return EXIT_FAILURE;
 
     /* connect to Trusty secure storage server */
     rc = ipc_connect(trusty_devname, ss_srv_name);
-    if (rc < 0)
-        return EXIT_FAILURE;
+    if (rc < 0) return EXIT_FAILURE;
 
     /* enter main loop */
     rc = proxy_loop();
diff --git a/trusty/storage/proxy/rpmb.c b/trusty/storage/proxy/rpmb.c
index 9c79105..e706d0a 100644
--- a/trusty/storage/proxy/rpmb.c
+++ b/trusty/storage/proxy/rpmb.c
@@ -54,14 +54,12 @@
 
 #ifdef RPMB_DEBUG
 
-static void print_buf(const char *prefix, const uint8_t *buf, size_t size)
-{
+static void print_buf(const char* prefix, const uint8_t* buf, size_t size) {
     size_t i;
 
     printf("%s @%p [%zu]", prefix, buf, size);
     for (i = 0; i < size; i++) {
-        if (i && i % 32 == 0)
-            printf("\n%*s", (int) strlen(prefix), "");
+        if (i && i % 32 == 0) printf("\n%*s", (int)strlen(prefix), "");
         printf(" %02x", buf[i]);
     }
     printf("\n");
@@ -70,34 +68,29 @@
 
 #endif
 
-
-int rpmb_send(struct storage_msg *msg, const void *r, size_t req_len)
-{
+int rpmb_send(struct storage_msg* msg, const void* r, size_t req_len) {
     int rc;
     struct {
         struct mmc_ioc_multi_cmd multi;
         struct mmc_ioc_cmd cmd_buf[3];
     } mmc = {};
-    struct mmc_ioc_cmd *cmd = mmc.multi.cmds;
-    const struct storage_rpmb_send_req *req = r;
+    struct mmc_ioc_cmd* cmd = mmc.multi.cmds;
+    const struct storage_rpmb_send_req* req = r;
 
     if (req_len < sizeof(*req)) {
-        ALOGW("malformed rpmb request: invalid length (%zu < %zu)\n",
-              req_len, sizeof(*req));
+        ALOGW("malformed rpmb request: invalid length (%zu < %zu)\n", req_len, sizeof(*req));
         msg->result = STORAGE_ERR_NOT_VALID;
         goto err_response;
     }
 
-    size_t expected_len =
-            sizeof(*req) + req->reliable_write_size + req->write_size;
+    size_t expected_len = sizeof(*req) + req->reliable_write_size + req->write_size;
     if (req_len != expected_len) {
-        ALOGW("malformed rpmb request: invalid length (%zu != %zu)\n",
-              req_len, expected_len);
+        ALOGW("malformed rpmb request: invalid length (%zu != %zu)\n", req_len, expected_len);
         msg->result = STORAGE_ERR_NOT_VALID;
         goto err_response;
     }
 
-    const uint8_t *write_buf = req->payload;
+    const uint8_t* write_buf = req->payload;
     if (req->reliable_write_size) {
         if ((req->reliable_write_size % MMC_BLOCK_SIZE) != 0) {
             ALOGW("invalid reliable write size %u\n", req->reliable_write_size);
@@ -143,8 +136,7 @@
     }
 
     if (req->read_size) {
-        if (req->read_size % MMC_BLOCK_SIZE != 0 ||
-            req->read_size > sizeof(read_buf)) {
+        if (req->read_size % MMC_BLOCK_SIZE != 0 || req->read_size > sizeof(read_buf)) {
             ALOGE("%s: invalid read size %u\n", __func__, req->read_size);
             msg->result = STORAGE_ERR_NOT_VALID;
             goto err_response;
@@ -152,8 +144,7 @@
 
         cmd->write_flag = MMC_WRITE_FLAG_R;
         cmd->opcode = MMC_READ_MULTIPLE_BLOCK;
-        cmd->flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC,
-        cmd->blksz = MMC_BLOCK_SIZE;
+        cmd->flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC, cmd->blksz = MMC_BLOCK_SIZE;
         cmd->blocks = req->read_size / MMC_BLOCK_SIZE;
         mmc_ioc_cmd_set_data((*cmd), read_buf);
 #ifdef RPMB_DEBUG
@@ -170,8 +161,7 @@
         goto err_response;
     }
 #ifdef RPMB_DEBUG
-    if (req->read_size)
-        print_buf("response: ", read_buf, req->read_size);
+    if (req->read_size) print_buf("response: ", read_buf, req->read_size);
 #endif
 
     if (msg->flags & STORAGE_MSG_FLAG_POST_COMMIT) {
@@ -188,24 +178,19 @@
     return ipc_respond(msg, NULL, 0);
 }
 
-
-int rpmb_open(const char *rpmb_devname)
-{
+int rpmb_open(const char* rpmb_devname) {
     int rc;
 
     rc = open(rpmb_devname, O_RDWR, 0);
     if (rc < 0) {
-        ALOGE("unable (%d) to open rpmb device '%s': %s\n",
-              errno, rpmb_devname, strerror(errno));
+        ALOGE("unable (%d) to open rpmb device '%s': %s\n", errno, rpmb_devname, strerror(errno));
         return rc;
     }
     rpmb_fd = rc;
     return 0;
 }
 
-void rpmb_close(void)
-{
+void rpmb_close(void) {
     close(rpmb_fd);
     rpmb_fd = -1;
 }
-
diff --git a/trusty/storage/proxy/rpmb.h b/trusty/storage/proxy/rpmb.h
index 85cff44..5107361 100644
--- a/trusty/storage/proxy/rpmb.h
+++ b/trusty/storage/proxy/rpmb.h
@@ -18,6 +18,6 @@
 #include <stdint.h>
 #include <trusty/interface/storage.h>
 
-int rpmb_open(const char *rpmb_devname);
-int rpmb_send(struct storage_msg *msg, const void *r, size_t req_len);
+int rpmb_open(const char* rpmb_devname);
+int rpmb_send(struct storage_msg* msg, const void* r, size_t req_len);
 void rpmb_close(void);