diff --git a/adb/daemon/file_sync_service.cpp b/adb/daemon/file_sync_service.cpp
index 8c39a20..d55096a 100644
--- a/adb/daemon/file_sync_service.cpp
+++ b/adb/daemon/file_sync_service.cpp
@@ -32,6 +32,10 @@
 #include <unistd.h>
 #include <utime.h>
 
+#include <memory>
+#include <string>
+#include <vector>
+
 #include <android-base/file.h>
 #include <android-base/stringprintf.h>
 #include <android-base/strings.h>
@@ -47,6 +51,7 @@
 #include "security_log_tags.h"
 #include "sysdeps/errno.h"
 
+using android::base::Dirname;
 using android::base::StringPrintf;
 
 static bool should_use_fs_config(const std::string& path) {
@@ -219,7 +224,7 @@
     }
 
     if (fd < 0 && errno == ENOENT) {
-        if (!secure_mkdirs(android::base::Dirname(path))) {
+        if (!secure_mkdirs(Dirname(path))) {
             SendSyncFailErrno(s, "secure_mkdirs failed");
             goto fail;
         }
@@ -327,8 +332,6 @@
 #else
 static bool handle_send_link(int s, const std::string& path, std::vector<char>& buffer) {
     syncmsg msg;
-    unsigned int len;
-    int ret;
 
     if (!ReadFdExactly(s, &msg.data, sizeof(msg.data))) return false;
 
@@ -337,24 +340,28 @@
         return false;
     }
 
-    len = msg.data.size;
+    unsigned int len = msg.data.size;
     if (len > buffer.size()) { // TODO: resize buffer?
         SendSyncFail(s, "oversize data message");
         return false;
     }
     if (!ReadFdExactly(s, &buffer[0], len)) return false;
 
-    ret = symlink(&buffer[0], path.c_str());
-    if (ret && errno == ENOENT) {
-        if (!secure_mkdirs(android::base::Dirname(path))) {
-            SendSyncFailErrno(s, "secure_mkdirs failed");
+    std::string buf_link;
+    if (!android::base::Readlink(path, &buf_link) || (buf_link != &buffer[0])) {
+        adb_unlink(path.c_str());
+        auto ret = symlink(&buffer[0], path.c_str());
+        if (ret && errno == ENOENT) {
+            if (!secure_mkdirs(Dirname(path))) {
+                SendSyncFailErrno(s, "secure_mkdirs failed");
+                return false;
+            }
+            ret = symlink(&buffer[0], path.c_str());
+        }
+        if (ret) {
+            SendSyncFailErrno(s, "symlink failed");
             return false;
         }
-        ret = symlink(&buffer[0], path.c_str());
-    }
-    if (ret) {
-        SendSyncFailErrno(s, "symlink failed");
-        return false;
     }
 
     if (!ReadFdExactly(s, &msg.data, sizeof(msg.data))) return false;
@@ -391,7 +398,8 @@
 
     // Don't delete files before copying if they are not "regular" or symlinks.
     struct stat st;
-    bool do_unlink = (lstat(path.c_str(), &st) == -1) || S_ISREG(st.st_mode) || S_ISLNK(st.st_mode);
+    bool do_unlink = (lstat(path.c_str(), &st) == -1) || S_ISREG(st.st_mode) ||
+                     (S_ISLNK(st.st_mode) && !S_ISLNK(mode));
     if (do_unlink) {
         adb_unlink(path.c_str());
     }
diff --git a/fastboot/device/commands.cpp b/fastboot/device/commands.cpp
index 3f663ef..b3fce54 100644
--- a/fastboot/device/commands.cpp
+++ b/fastboot/device/commands.cpp
@@ -131,6 +131,11 @@
     if (args.size() < 2) {
         return device->WriteStatus(FastbootResult::FAIL, "Invalid arguments");
     }
+
+    if (GetDeviceLockStatus()) {
+        return device->WriteStatus(FastbootResult::FAIL, "Erase is not allowed on locked devices");
+    }
+
     PartitionHandle handle;
     if (!OpenPartition(device, args[1], &handle)) {
         return device->WriteStatus(FastbootResult::FAIL, "Partition doesn't exist");
@@ -163,6 +168,12 @@
     if (args.size() < 2) {
         return device->WriteStatus(FastbootResult::FAIL, "size argument unspecified");
     }
+
+    if (GetDeviceLockStatus()) {
+        return device->WriteStatus(FastbootResult::FAIL,
+                                   "Download is not allowed on locked devices");
+    }
+
     // arg[0] is the command name, arg[1] contains size of data to be downloaded
     unsigned int size;
     if (!android::base::ParseUint("0x" + args[1], &size, UINT_MAX)) {
@@ -203,6 +214,11 @@
         return device->WriteStatus(FastbootResult::FAIL, "Missing slot argument");
     }
 
+    if (GetDeviceLockStatus()) {
+        return device->WriteStatus(FastbootResult::FAIL,
+                                   "set_active command is not allowed on locked devices");
+    }
+
     // Slot suffix needs to be between 'a' and 'z'.
     Slot slot;
     if (!GetSlotNumber(args[1], &slot)) {
diff --git a/libcutils/include/private/android_filesystem_config.h b/libcutils/include/private/android_filesystem_config.h
index 3be8ad0..845c586 100644
--- a/libcutils/include/private/android_filesystem_config.h
+++ b/libcutils/include/private/android_filesystem_config.h
@@ -131,6 +131,7 @@
 #define AID_SECURE_ELEMENT 1068  /* secure element subsystem */
 #define AID_LMKD 1069            /* low memory killer daemon */
 #define AID_LLKD 1070            /* live lock daemon */
+#define AID_IORAPD 1071          /* input/output readahead and pin daemon */
 /* Changes to this file must be made in AOSP, *not* in internal branches. */
 
 #define AID_SHELL 2000 /* adb and debug shell user */
diff --git a/llkd/include/llkd.h b/llkd/include/llkd.h
index c724fce..1e2df2f 100644
--- a/llkd/include/llkd.h
+++ b/llkd/include/llkd.h
@@ -57,7 +57,7 @@
 #define LLK_BLACKLIST_UID_PROPERTY     "ro.llk.blacklist.uid"
 #define LLK_BLACKLIST_UID_DEFAULT      ""
 #define LLK_BLACKLIST_STACK_PROPERTY   "ro.llk.blacklist.process.stack"
-#define LLK_BLACKLIST_STACK_DEFAULT    "init,lmkd.llkd,llkd,keystore,/system/bin/keystore"
+#define LLK_BLACKLIST_STACK_DEFAULT    "init,lmkd.llkd,llkd,keystore,/system/bin/keystore,ueventd"
 /* clang-format on */
 
 __END_DECLS