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/base/include/android-base/parseint.h b/base/include/android-base/parseint.h
index 9444fdd..be8b97b 100644
--- a/base/include/android-base/parseint.h
+++ b/base/include/android-base/parseint.h
@@ -22,6 +22,7 @@
 
 #include <limits>
 #include <string>
+#include <type_traits>
 
 namespace android {
 namespace base {
@@ -33,6 +34,7 @@
 template <typename T>
 bool ParseUint(const char* s, T* out, T max = std::numeric_limits<T>::max(),
                bool allow_suffixes = false) {
+  static_assert(std::is_unsigned<T>::value, "ParseUint can only be used with unsigned types");
   while (isspace(*s)) {
     s++;
   }
@@ -96,6 +98,7 @@
 bool ParseInt(const char* s, T* out,
               T min = std::numeric_limits<T>::min(),
               T max = std::numeric_limits<T>::max()) {
+  static_assert(std::is_signed<T>::value, "ParseInt can only be used with signed types");
   while (isspace(*s)) {
     s++;
   }
diff --git a/fastboot/device/commands.cpp b/fastboot/device/commands.cpp
index 3f663ef..d5ea6db 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");
@@ -163,9 +168,15 @@
     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)) {
+    if (!android::base::ParseUint("0x" + args[1], &size, kMaxDownloadSizeDefault)) {
         return device->WriteStatus(FastbootResult::FAIL, "Invalid size");
     }
     device->download_data().resize(size);
@@ -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/fastboot/device/commands.h b/fastboot/device/commands.h
index 9df43a9..bb1f988 100644
--- a/fastboot/device/commands.h
+++ b/fastboot/device/commands.h
@@ -19,6 +19,8 @@
 #include <string>
 #include <vector>
 
+constexpr unsigned int kMaxDownloadSizeDefault = 0x20000000;
+
 class FastbootDevice;
 
 enum class FastbootResult {
diff --git a/fastboot/device/utility.cpp b/fastboot/device/utility.cpp
index 528abec..b844b9f 100644
--- a/fastboot/device/utility.cpp
+++ b/fastboot/device/utility.cpp
@@ -23,6 +23,7 @@
 
 #include <android-base/file.h>
 #include <android-base/logging.h>
+#include <android-base/strings.h>
 #include <fs_mgr.h>
 #include <fs_mgr_dm_linear.h>
 #include <liblp/liblp.h>
@@ -82,6 +83,10 @@
 }
 
 std::optional<std::string> FindPhysicalPartition(const std::string& name) {
+    // Check for an invalid file name
+    if (android::base::StartsWith(name, "../") || name.find("/../") != std::string::npos) {
+        return {};
+    }
     std::string path = "/dev/block/by-name/" + name;
     if (access(path.c_str(), W_OK) < 0) {
         return {};
@@ -164,6 +169,9 @@
 
 bool GetDeviceLockStatus() {
     std::string cmdline;
-    android::base::ReadFileToString("/proc/cmdline", &cmdline);
+    // Return lock status true if unable to read kernel command line.
+    if (!android::base::ReadFileToString("/proc/cmdline", &cmdline)) {
+        return true;
+    }
     return cmdline.find("androidboot.verifiedbootstate=orange") == std::string::npos;
 }
diff --git a/fastboot/device/variables.cpp b/fastboot/device/variables.cpp
index 2de79b1..630e22d 100644
--- a/fastboot/device/variables.cpp
+++ b/fastboot/device/variables.cpp
@@ -36,7 +36,6 @@
 using ::android::hardware::fastboot::V1_0::Result;
 using ::android::hardware::fastboot::V1_0::Status;
 
-constexpr int kMaxDownloadSizeDefault = 0x20000000;
 constexpr char kFastbootProtocolVersion[] = "0.4";
 
 bool GetVersion(FastbootDevice* /* device */, const std::vector<std::string>& /* args */,
diff --git a/fs_mgr/fs_mgr.cpp b/fs_mgr/fs_mgr.cpp
index 3ab9732..7f9d9a4 100644
--- a/fs_mgr/fs_mgr.cpp
+++ b/fs_mgr/fs_mgr.cpp
@@ -37,6 +37,7 @@
 #include <memory>
 #include <string>
 #include <thread>
+#include <utility>
 #include <vector>
 
 #include <android-base/file.h>
@@ -1500,16 +1501,17 @@
     bool system_root = android::base::GetProperty("ro.build.system_root_image", "") == "true";
 
     for (int i = 0; i < fstab->num_entries; i++) {
-        if (!fs_mgr_is_verified(&fstab->recs[i]) && !fs_mgr_is_avb(&fstab->recs[i])) {
+        auto fsrec = &fstab->recs[i];
+        if (!fs_mgr_is_verified(fsrec) && !fs_mgr_is_avb(fsrec)) {
             continue;
         }
 
         std::string mount_point;
-        if (system_root && !strcmp(fstab->recs[i].mount_point, "/")) {
+        if (system_root && !strcmp(fsrec->mount_point, "/")) {
             // In AVB, the dm device name is vroot instead of system.
-            mount_point = fs_mgr_is_avb(&fstab->recs[i]) ? "vroot" : "system";
+            mount_point = fs_mgr_is_avb(fsrec) ? "vroot" : "system";
         } else {
-            mount_point = basename(fstab->recs[i].mount_point);
+            mount_point = basename(fsrec->mount_point);
         }
 
         if (dm.GetState(mount_point) == DmDeviceState::INVALID) {
@@ -1517,15 +1519,14 @@
             continue;
         }
 
-        const char* status = nullptr;
+        const char* status;
         std::vector<DeviceMapper::TargetInfo> table;
         if (!dm.GetTableStatus(mount_point, &table) || table.empty() || table[0].data.empty()) {
-            if (fstab->recs[i].fs_mgr_flags & MF_VERIFYATBOOT) {
-                status = "V";
-            } else {
-                PERROR << "Failed to query DM_TABLE_STATUS for " << mount_point.c_str();
+            if (!fs_mgr_is_verifyatboot(fsrec)) {
+                PERROR << "Failed to query DM_TABLE_STATUS for " << mount_point;
                 continue;
             }
+            status = "V";
         } else {
             status = table[0].data.c_str();
         }
@@ -1535,7 +1536,7 @@
         // instead of [partition.vroot.verified].
         if (mount_point == "vroot") mount_point = "system";
         if (*status == 'C' || *status == 'V') {
-            callback(&fstab->recs[i], mount_point.c_str(), mode, *status);
+            callback(fsrec, mount_point.c_str(), mode, *status);
         }
     }
 
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