Merge branch 'cm-13.0' of https://github.com/CyanogenMod/android_system_core into replicant-6.0

40 files changed, 1205 insertions, 287 deletions

diff --git a/adb/Android.mk b/adb/Android.mk
index 425bf9b..d4adbfb 100644
--- a/adb/Android.mk
+++ b/adb/Android.mk
@@ -200,7 +200,10 @@ endif
 # will violate ODR
 LOCAL_SHARED_LIBRARIES :=
 
+# Don't build the host adb on Windows (this branch should only be used for security updates.)
+ifneq ($(HOST_OS),windows)
 include $(BUILD_HOST_EXECUTABLE)
+endif
 
 $(call dist-for-goals,dist_files sdk,$(LOCAL_BUILT_MODULE))
 
diff --git a/adb/mutex_list.h b/adb/mutex_list.h
index ff72751..15e383c 100644
--- a/adb/mutex_list.h
+++ b/adb/mutex_list.h
@@ -6,7 +6,6 @@
 #ifndef ADB_MUTEX
 #error ADB_MUTEX not defined when including this file
 #endif
-ADB_MUTEX(socket_list_lock)
 ADB_MUTEX(transport_lock)
 #if ADB_HOST
 ADB_MUTEX(local_transports_lock)
diff --git a/adb/sockets.cpp b/adb/sockets.cpp
index 32ca17d..3919147 100644
--- a/adb/sockets.cpp
+++ b/adb/sockets.cpp
@@ -25,18 +25,25 @@
 #include <string.h>
 #include <unistd.h>
 
+#include <algorithm>
+#include <mutex>
+#include <string>
+#include <vector>
+
 #if !ADB_HOST
 #include "cutils/properties.h"
 #endif
 
 #include "adb.h"
 #include "adb_io.h"
+#include "sysdeps/mutex.h"
 #include "transport.h"
 
-ADB_MUTEX_DEFINE( socket_list_lock );
-
-static void local_socket_close_locked(asocket *s);
+#if !defined(__BIONIC__)
+using std::recursive_mutex;
+#endif
 
+static recursive_mutex& local_socket_list_lock = *new recursive_mutex();
 static unsigned local_socket_next_id = 1;
 
 static asocket local_socket_list = {
@@ -61,7 +68,7 @@ asocket *find_local_socket(unsigned local_id, unsigned peer_id)
     asocket *s;
     asocket *result = NULL;
 
-    adb_mutex_lock(&socket_list_lock);
+    std::lock_guard<recursive_mutex> lock(local_socket_list_lock);
     for (s = local_socket_list.next; s != &local_socket_list; s = s->next) {
         if (s->id != local_id)
             continue;
@@ -70,7 +77,6 @@ asocket *find_local_socket(unsigned local_id, unsigned peer_id)
         }
         break;
     }
-    adb_mutex_unlock(&socket_list_lock);
 
     return result;
 }
@@ -84,20 +90,17 @@ insert_local_socket(asocket*  s, asocket*  list)
     s->next->prev = s;
 }
 
-
-void install_local_socket(asocket *s)
-{
-    adb_mutex_lock(&socket_list_lock);
+void install_local_socket(asocket* s) {
+    std::lock_guard<recursive_mutex> lock(local_socket_list_lock);
 
     s->id = local_socket_next_id++;
 
     // Socket ids should never be 0.
-    if (local_socket_next_id == 0)
-      local_socket_next_id = 1;
+    if (local_socket_next_id == 0) {
+        fatal("local socket id overflow");
+    }
 
     insert_local_socket(s, &local_socket_list);
-
-    adb_mutex_unlock(&socket_list_lock);
 }
 
 void remove_socket(asocket *s)
@@ -116,19 +119,17 @@ void remove_socket(asocket *s)
 void close_all_sockets(atransport *t)
 {
     asocket *s;
-
-        /* this is a little gross, but since s->close() *will* modify
-        ** the list out from under you, your options are limited.
-        */
-    adb_mutex_lock(&socket_list_lock);
+    /* this is a little gross, but since s->close() *will* modify
+    ** the list out from under you, your options are limited.
+    */
+    std::lock_guard<recursive_mutex> lock(local_socket_list_lock);
 restart:
-    for(s = local_socket_list.next; s != &local_socket_list; s = s->next){
-        if(s->transport == t || (s->peer && s->peer->transport == t)) {
-            local_socket_close_locked(s);
+    for (s = local_socket_list.next; s != &local_socket_list; s = s->next) {
+        if (s->transport == t || (s->peer && s->peer->transport == t)) {
+            s->close(s);
             goto restart;
         }
     }
-    adb_mutex_unlock(&socket_list_lock);
 }
 
 static int local_socket_enqueue(asocket *s, apacket *p)
@@ -191,13 +192,6 @@ static void local_socket_ready(asocket *s)
     fdevent_add(&s->fde, FDE_READ);
 }
 
-static void local_socket_close(asocket *s)
-{
-    adb_mutex_lock(&socket_list_lock);
-    local_socket_close_locked(s);
-    adb_mutex_unlock(&socket_list_lock);
-}
-
 // be sure to hold the socket list lock when calling this
 static void local_socket_destroy(asocket  *s)
 {
@@ -226,27 +220,21 @@ static void local_socket_destroy(asocket  *s)
     }
 }
 
-
-static void local_socket_close_locked(asocket *s)
-{
-    D("entered local_socket_close_locked. LS(%d) fd=%d\n", s->id, s->fd);
-    if(s->peer) {
-        D("LS(%d): closing peer. peer->id=%d peer->fd=%d\n",
-          s->id, s->peer->id, s->peer->fd);
+static void local_socket_close(asocket* s) {
+    D("entered local_socket_close. LS(%d) fd=%d", s->id, s->fd);
+    std::lock_guard<recursive_mutex> lock(local_socket_list_lock);
+    if (s->peer) {
+        D("LS(%d): closing peer. peer->id=%d peer->fd=%d", s->id, s->peer->id, s->peer->fd);
         /* Note: it's important to call shutdown before disconnecting from
          * the peer, this ensures that remote sockets can still get the id
          * of the local socket they're connected to, to send a CLOSE()
          * protocol event. */
-        if (s->peer->shutdown)
-          s->peer->shutdown(s->peer);
-        s->peer->peer = 0;
-        // tweak to avoid deadlock
-        if (s->peer->close == local_socket_close) {
-            local_socket_close_locked(s->peer);
-        } else {
-            s->peer->close(s->peer);
+        if (s->peer->shutdown) {
+            s->peer->shutdown(s->peer);
         }
-        s->peer = 0;
+        s->peer->peer = nullptr;
+        s->peer->close(s->peer);
+        s->peer = nullptr;
     }
 
         /* If we are already closing, or if there are no
diff --git a/adb/sysdeps/mutex.h b/adb/sysdeps/mutex.h
new file mode 100644
index 0000000..ef5d9b1
--- /dev/null
+++ b/adb/sysdeps/mutex.h
@@ -0,0 +1,143 @@
+#pragma once
+
+/*
+ * Copyright (C) 2016 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.
+ */
+
+#if defined(_WIN32)
+
+#include <windows.h>
+
+#include <android-base/macros.h>
+
+#include "adb.h"
+
+// The prebuilt version of mingw we use doesn't support mutex or recursive_mutex.
+// Therefore, implement our own using the Windows primitives.
+// Put them directly into the std namespace, so that when they're actually available, the build
+// breaks until they're removed.
+
+#include <mutex>
+namespace std {
+
+// CRITICAL_SECTION is recursive, so just wrap it in a Mutex-compatible class.
+class recursive_mutex {
+  public:
+    recursive_mutex() {
+        InitializeCriticalSection(&mutex_);
+    }
+
+    ~recursive_mutex() {
+        DeleteCriticalSection(&mutex_);
+    }
+
+    void lock() {
+        EnterCriticalSection(&mutex_);
+    }
+
+    bool try_lock() {
+        return TryEnterCriticalSection(&mutex_);
+    }
+
+    void unlock() {
+        LeaveCriticalSection(&mutex_);
+    }
+
+  private:
+    CRITICAL_SECTION mutex_;
+
+    DISALLOW_COPY_AND_ASSIGN(recursive_mutex);
+};
+
+class mutex {
+  public:
+    mutex() {
+    }
+
+    ~mutex() {
+    }
+
+    void lock() {
+        mutex_.lock();
+        if (++lock_count_ != 1) {
+            fatal("non-recursive mutex locked reentrantly");
+        }
+    }
+
+    void unlock() {
+        if (--lock_count_ != 0) {
+            fatal("non-recursive mutex unlock resulted in unexpected lock count: %d", lock_count_);
+        }
+        mutex_.unlock();
+    }
+
+    bool try_lock() {
+        if (!mutex_.try_lock()) {
+            return false;
+        }
+
+        if (lock_count_ != 0) {
+            mutex_.unlock();
+            return false;
+        }
+
+        ++lock_count_;
+        return true;
+    }
+
+  private:
+    recursive_mutex mutex_;
+    size_t lock_count_ = 0;
+};
+
+}
+
+#elif defined(__BIONIC__)
+
+// On M, the recovery image uses parts of adb that depends on recursive_mutex, and uses libstdc++,
+// which lacks it.
+
+#include <pthread.h>
+#include <mutex>
+
+#include <base/macros.h>
+
+class recursive_mutex {
+  public:
+    recursive_mutex() {
+    }
+
+    ~recursive_mutex() {
+    }
+
+    void lock() {
+        pthread_mutex_lock(&mutex_);
+    }
+
+    bool try_lock() {
+        return pthread_mutex_trylock(&mutex_);
+    }
+
+    void unlock() {
+        pthread_mutex_unlock(&mutex_);
+    }
+
+  private:
+    pthread_mutex_t mutex_ = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
+
+    DISALLOW_COPY_AND_ASSIGN(recursive_mutex);
+};
+
+#endif
diff --git a/debuggerd/backtrace.cpp b/debuggerd/backtrace.cpp
index b8084c5..ad6a6ee 100644
--- a/debuggerd/backtrace.cpp
+++ b/debuggerd/backtrace.cpp
@@ -67,8 +67,8 @@ static void dump_process_footer(log_t* log, pid_t pid) {
   _LOG(log, logtype::BACKTRACE, "\n----- end %d -----\n", pid);
 }
 
-static void dump_thread(
-    log_t* log, pid_t tid, bool attached, bool* detach_failed, int* total_sleep_time_usec) {
+static void dump_thread(log_t* log, pid_t pid, pid_t tid, bool attached,
+                        bool* detach_failed, int* total_sleep_time_usec) {
   char path[PATH_MAX];
   char threadnamebuf[1024];
   char* threadname = NULL;
@@ -88,7 +88,7 @@ static void dump_thread(
 
   _LOG(log, logtype::BACKTRACE, "\n\"%s\" sysTid=%d\n", threadname ? threadname : "<unknown>", tid);
 
-  if (!attached && ptrace(PTRACE_ATTACH, tid, 0, 0) < 0) {
+  if (!attached && !ptrace_attach_thread(pid, tid)) {
     _LOG(log, logtype::BACKTRACE, "Could not attach to thread: %s\n", strerror(errno));
     return;
   }
@@ -117,7 +117,7 @@ void dump_backtrace(int fd, int amfd, pid_t pid, pid_t tid, bool* detach_failed,
   log.amfd = amfd;
 
   dump_process_header(&log, pid);
-  dump_thread(&log, tid, true, detach_failed, total_sleep_time_usec);
+  dump_thread(&log, pid, tid, true, detach_failed, total_sleep_time_usec);
 
   char task_path[64];
   snprintf(task_path, sizeof(task_path), "/proc/%d/task", pid);
@@ -135,7 +135,7 @@ void dump_backtrace(int fd, int amfd, pid_t pid, pid_t tid, bool* detach_failed,
         continue;
       }
 
-      dump_thread(&log, new_tid, false, detach_failed, total_sleep_time_usec);
+      dump_thread(&log, pid, new_tid, false, detach_failed, total_sleep_time_usec);
     }
     closedir(d);
   }
diff --git a/debuggerd/debuggerd.cpp b/debuggerd/debuggerd.cpp
index 984b931..7f3fbc3 100644
--- a/debuggerd/debuggerd.cpp
+++ b/debuggerd/debuggerd.cpp
@@ -1,5 +1,6 @@
 /*
  * Copyright 2006, The Android Open Source Project
+ * Copyright (c) 2015, The Linux Foundation. All rights reserved.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -138,6 +139,84 @@ static int get_process_info(pid_t tid, pid_t* out_pid, uid_t* out_uid, uid_t* ou
   return fields == 7 ? 0 : -1;
 }
 
+static bool copy_file(const char* src, char* dest)
+{
+   #define BUF_SIZE 64
+   ssize_t bytes;
+   int  source_fh, dest_fh;
+   int  total_size = 0;
+   char buffer[BUF_SIZE];
+
+   if ((source_fh = open(src, O_RDONLY, O_NOFOLLOW)) == -1) {
+        ALOGE("Unable to open source file %s\n", src);
+   } else {
+        if((dest_fh = open(dest, O_WRONLY | O_CREAT | O_TRUNC | O_NOFOLLOW, 0640)) == -1) {
+            ALOGE("Unable to write destination file %s\n", dest);
+        } else {
+            while ((bytes = read(source_fh, buffer, BUF_SIZE)) > 0) {
+                if (write(dest_fh, buffer, bytes) < 0) {
+                    ALOGE("Write failed for destination file %s. Copied %d bytes\n",
+                            dest, total_size);
+                    break;
+                }
+                total_size += bytes;
+            }
+            ALOGI("Copied %s to %s - size: %d\n", src, dest, total_size);
+            fsync(dest_fh);
+            close(dest_fh);
+        }
+        close(source_fh);
+        if (total_size > 0) {
+            return true;
+        }
+    }
+    return false;
+}
+
+static void collect_etb_map(int cr_pid)
+{
+    struct stat s;
+    char   src_buf[64];
+    char   dest_buf[64];
+
+    snprintf(dest_buf, sizeof dest_buf, "/data/core/etb.%d", cr_pid);
+    if (!copy_file("/dev/coresight-tmc-etf", dest_buf)) {
+        ALOGE("Unable to copy ETB buffer file /dev/coresight-tmc-etf\n");
+    } else {
+        memset(src_buf, 0, sizeof(src_buf));
+        snprintf(src_buf, sizeof(src_buf), "/proc/%d/maps", cr_pid);
+        if(stat(src_buf, &s)) {
+            ALOGE("map file /proc/%d/maps does not exist for pid %d\n",
+                cr_pid, cr_pid);
+        } else {
+            snprintf(dest_buf, sizeof dest_buf, "/data/core/maps.%d", cr_pid);
+            if (!copy_file(src_buf, dest_buf)) {
+                ALOGE("Unable to copy map file /proc/%d/maps", cr_pid);
+            }
+        }
+    }
+}
+
+static void enable_etb_trace(struct ucred cr) {
+    char value[PROPERTY_VALUE_MAX];
+    property_get("persist.debug.trace", value, "");
+    if ((strcmp(value,"1") == 0)) {
+        /* Allow ETB collection only once; Note: in future this behavior can be changed
+        * To allow this, use a property to indicate whether the ETB has been collected */
+        property_get("debug.etb.collected", value, "");
+        if(strcmp(value,"1")) {
+            ALOGI("Collecting ETB dumps (from pid=%d uid=%d)\n",
+                     cr.pid, cr.uid);
+            property_set("debug.etb.collected", "1");
+            collect_etb_map(cr.pid);
+        }
+        else {
+            ALOGI("ETB already collected once, skipping (from pid=%d uid=%d)\n",
+                     cr.pid, cr.uid);
+        }
+    }
+}
+
 static int selinux_enabled;
 
 /*
@@ -229,14 +308,13 @@ static int read_request(int fd, debugger_request_t* out_request) {
 
   if (msg.action == DEBUGGER_ACTION_CRASH) {
     // Ensure that the tid reported by the crashing process is valid.
-    char buf[64];
-    struct stat s;
-    snprintf(buf, sizeof buf, "/proc/%d/task/%d", out_request->pid, out_request->tid);
-    if (stat(buf, &s)) {
+    // This check needs to happen again after ptracing the requested thread to prevent a race.
+    if (!pid_contains_tid(out_request->pid, out_request->tid)) {
       ALOGE("tid %d does not exist in pid %d. ignoring debug request\n",
-          out_request->tid, out_request->pid);
+            out_request->tid, out_request->pid);
       return -1;
     }
+    enable_etb_trace(cr);
   } else if (cr.uid == 0
             || (cr.uid == AID_SYSTEM && msg.action == DEBUGGER_ACTION_DUMP_BACKTRACE)) {
     // Only root or system can ask us to attach to any process and dump it explicitly.
@@ -396,9 +474,32 @@ static void handle_request(int fd) {
     // ensure that it can run as soon as we call PTRACE_CONT below.
     // See details in bionic/libc/linker/debugger.c, in function
     // debugger_signal_handler().
-    if (ptrace(PTRACE_ATTACH, request.tid, 0, 0)) {
+    if (!ptrace_attach_thread(request.pid, request.tid)) {
       ALOGE("ptrace attach failed: %s\n", strerror(errno));
     } else {
+      // DEBUGGER_ACTION_CRASH requests can come from arbitrary processes and the tid field in
+      // the request is sent from the other side. If an attacker can cause a process to be
+      // spawned with the pid of their process, they could trick debuggerd into dumping that
+      // process by exiting after sending the request. Validate the trusted request.uid/gid
+      // to defend against this.
+      if (request.action == DEBUGGER_ACTION_CRASH) {
+        pid_t pid;
+        uid_t uid;
+        gid_t gid;
+        if (get_process_info(request.tid, &pid, &uid, &gid) != 0) {
+          ALOGE("debuggerd: failed to get process info for tid '%d'", request.tid);
+          exit(1);
+        }
+
+        if (pid != request.pid || uid != request.uid || gid != request.gid) {
+          ALOGE(
+            "debuggerd: attached task %d does not match request: "
+            "expected pid=%d,uid=%d,gid=%d, actual pid=%d,uid=%d,gid=%d",
+            request.tid, request.pid, request.uid, request.gid, pid, uid, gid);
+          exit(1);
+        }
+      }
+
       bool detach_failed = false;
       bool tid_unresponsive = false;
       bool attach_gdb = should_attach_gdb(&request);
diff --git a/debuggerd/tombstone.cpp b/debuggerd/tombstone.cpp
index b0ad274..82d8fdf 100644
--- a/debuggerd/tombstone.cpp
+++ b/debuggerd/tombstone.cpp
@@ -167,10 +167,13 @@ static const char* get_sigcode(int signo, int code) {
 static void dump_header_info(log_t* log) {
   char fingerprint[PROPERTY_VALUE_MAX];
   char revision[PROPERTY_VALUE_MAX];
+  char cm_version[PROPERTY_VALUE_MAX];
 
+  property_get("ro.cm.version", cm_version, "unknown");
   property_get("ro.build.fingerprint", fingerprint, "unknown");
   property_get("ro.revision", revision, "unknown");
 
+  _LOG(log, logtype::HEADER, "CM Version: '%s'\n", cm_version);
   _LOG(log, logtype::HEADER, "Build fingerprint: '%s'\n", fingerprint);
   _LOG(log, logtype::HEADER, "Revision: '%s'\n", revision);
   _LOG(log, logtype::HEADER, "ABI: '%s'\n", ABI_STRING);
@@ -447,7 +450,7 @@ static bool dump_sibling_thread_report(
     }
 
     // Skip this thread if cannot ptrace it
-    if (ptrace(PTRACE_ATTACH, new_tid, 0, 0) < 0) {
+    if (!ptrace_attach_thread(pid, new_tid)) {
       _LOG(log, logtype::ERROR, "ptrace attach to %d failed: %s\n", new_tid, strerror(errno));
       continue;
     }
@@ -788,21 +791,8 @@ char* engrave_tombstone(pid_t pid, pid_t tid, int signal, int original_si_code,
   log.current_tid = tid;
   log.crashed_tid = tid;
 
-  if ((mkdir(TOMBSTONE_DIR, 0755) == -1) && (errno != EEXIST)) {
-    _LOG(&log, logtype::ERROR, "failed to create %s: %s\n", TOMBSTONE_DIR, strerror(errno));
-  }
-
-  if (chown(TOMBSTONE_DIR, AID_SYSTEM, AID_SYSTEM) == -1) {
-    _LOG(&log, logtype::ERROR, "failed to change ownership of %s: %s\n", TOMBSTONE_DIR, strerror(errno));
-  }
-
   int fd = -1;
-  char* path = NULL;
-  if (selinux_android_restorecon(TOMBSTONE_DIR, 0) == 0) {
-    path = find_and_open_tombstone(&fd);
-  } else {
-    _LOG(&log, logtype::ERROR, "Failed to restore security context, not writing tombstone.\n");
-  }
+  char* path = find_and_open_tombstone(&fd);
 
   if (fd < 0) {
     _LOG(&log, logtype::ERROR, "Skipping tombstone write, nothing to do.\n");
diff --git a/debuggerd/utility.cpp b/debuggerd/utility.cpp
index 9f340a8..236d667 100644
--- a/debuggerd/utility.cpp
+++ b/debuggerd/utility.cpp
@@ -20,6 +20,7 @@
 
 #include <errno.h>
 #include <signal.h>
+#include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 #include <sys/ptrace.h>
@@ -207,3 +208,31 @@ void dump_memory(log_t* log, Backtrace* backtrace, uintptr_t addr, const char* f
     _LOG(log, logtype::MEMORY, "%s  %s\n", logline.c_str(), ascii.c_str());
   }
 }
+
+bool pid_contains_tid(pid_t pid, pid_t tid) {
+  char task_path[PATH_MAX];
+  if (snprintf(task_path, PATH_MAX, "/proc/%d/task/%d", pid, tid) >= PATH_MAX) {
+    ALOGE("debuggerd: task path overflow (pid = %d, tid = %d)\n", pid, tid);
+    exit(1);
+  }
+
+  return access(task_path, F_OK) == 0;
+}
+
+// Attach to a thread, and verify that it's still a member of the given process
+bool ptrace_attach_thread(pid_t pid, pid_t tid) {
+  if (ptrace(PTRACE_ATTACH, tid, 0, 0) != 0) {
+    return false;
+  }
+
+  // Make sure that the task we attached to is actually part of the pid we're dumping.
+  if (!pid_contains_tid(pid, tid)) {
+    if (ptrace(PTRACE_DETACH, tid, 0, 0) != 0) {
+      ALOGE("debuggerd: failed to detach from thread '%d'", tid);
+      exit(1);
+    }
+    return false;
+  }
+
+  return true;
+}
diff --git a/debuggerd/utility.h b/debuggerd/utility.h
index 263374d..e8ec7ef 100644
--- a/debuggerd/utility.h
+++ b/debuggerd/utility.h
@@ -79,4 +79,9 @@ int wait_for_sigstop(pid_t, int*, bool*);
 
 void dump_memory(log_t* log, Backtrace* backtrace, uintptr_t addr, const char* fmt, ...);
 
+bool pid_contains_tid(pid_t pid, pid_t tid);
+
+// Attach to a thread, and verify that it's still a member of the given process
+bool ptrace_attach_thread(pid_t pid, pid_t tid);
+
 #endif // _DEBUGGERD_UTILITY_H
diff --git a/fastboot/fastboot.cpp b/fastboot/fastboot.cpp
index 5112c15..91152a4 100644
--- a/fastboot/fastboot.cpp
+++ b/fastboot/fastboot.cpp
@@ -207,7 +207,10 @@ int match_fastboot_with_serial(usb_ifc_info *info, const char *local_serial)
        (info->dev_vendor != 0x0421) &&  // Nokia
        (info->dev_vendor != 0x1ebf) &&  // Coolpad
        (info->dev_vendor != 0x2b4c) &&  // Zuk
-       (info->dev_vendor != 0x2a96))    // MMX
+       (info->dev_vendor != 0x2a96) &&  // MMX
+       (info->dev_vendor != 0x19d2) &&  // ZTE
+       (info->dev_vendor != 0x2c3f) &&  // Nextbit
+       (info->dev_vendor != 0x1bbb))    // Alcatel
             return -1;
     if(info->ifc_class != 0xff) return -1;
     if(info->ifc_subclass != 0x42) return -1;
diff --git a/fs_mgr/Android.mk b/fs_mgr/Android.mk
index d105b0b..43c64fb 100644
--- a/fs_mgr/Android.mk
+++ b/fs_mgr/Android.mk
@@ -23,6 +23,30 @@ endif
 
 include $(BUILD_STATIC_LIBRARY)
 
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES:= fs_mgr.c fs_mgr_verity.c fs_mgr_fstab.c
+LOCAL_SRC_FILES += fs_mgr_format.c
+
+LOCAL_C_INCLUDES := $(LOCAL_PATH)/include \
+    system/vold \
+    system/extras/ext4_utils \
+    external/openssl/include \
+    system/core/logwrapper/include
+
+LOCAL_MODULE:= libfs_mgr
+LOCAL_WHOLE_STATIC_LIBRARIES := liblogwrap libmincrypt libext4_utils_static libsquashfs_utils libsparse_static libext2_blkid libext2_uuid_static
+LOCAL_STATIC_LIBRARIES := libcutils liblog libsparse_static libz libselinux
+LOCAL_C_INCLUDES += system/extras/ext4_utils system/extras/squashfs_utils external/e2fsprogs/lib
+LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/include
+LOCAL_CFLAGS := -Werror
+
+ifneq (,$(filter userdebug,$(TARGET_BUILD_VARIANT)))
+LOCAL_CFLAGS += -DALLOW_ADBD_DISABLE_VERITY=1
+endif
+
+include $(BUILD_SHARED_LIBRARY)
+
 
 
 include $(CLEAR_VARS)
diff --git a/fs_mgr/fs_mgr.c b/fs_mgr/fs_mgr.c
index c80e531..e78b581 100644
--- a/fs_mgr/fs_mgr.c
+++ b/fs_mgr/fs_mgr.c
@@ -161,12 +161,12 @@ static void check_fs(char *blk_device, char *fs_type, char *target)
             }
         }
     } else if (!strcmp(fs_type, "f2fs")) {
-        char *f2fs_fsck_argv[] = {
-            F2FS_FSCK_BIN,
-            "-a",
-            blk_device
-        };
-        INFO("Running %s on %s\n", F2FS_FSCK_BIN, blk_device);
+            char *f2fs_fsck_argv[] = {
+                    F2FS_FSCK_BIN,
+                    "-a",
+                    blk_device
+            };
+        INFO("Running %s -a %s\n", F2FS_FSCK_BIN, blk_device);
 
         ret = android_fork_execvp_ext(ARRAY_SIZE(f2fs_fsck_argv), f2fs_fsck_argv,
                                       &status, true, LOG_KLOG | LOG_FILE,
diff --git a/healthd/Android.mk b/healthd/Android.mk
index d1e005e..f509ace 100644
--- a/healthd/Android.mk
+++ b/healthd/Android.mk
@@ -10,7 +10,7 @@ include $(BUILD_STATIC_LIBRARY)
 
 include $(CLEAR_VARS)
 LOCAL_SRC_FILES := healthd_board_msm.cpp
-LOCAL_MODULE := libhealthd.msm
+LOCAL_MODULE := libhealthd.qcom
 LOCAL_CFLAGS := -Werror
 include $(BUILD_STATIC_LIBRARY)
 
@@ -34,6 +34,7 @@ LOCAL_CFLAGS := -D__STDC_LIMIT_MACROS -Werror
 HEALTHD_CHARGER_DEFINES := RED_LED_PATH \
     GREEN_LED_PATH \
     BLUE_LED_PATH \
+    BLINK_PATH \
     BACKLIGHT_PATH \
     CHARGING_ENABLED_PATH
 
@@ -51,6 +52,10 @@ ifeq ($(strip $(BOARD_CHARGER_ENABLE_SUSPEND)),true)
 LOCAL_CFLAGS += -DCHARGER_ENABLE_SUSPEND
 endif
 
+ifeq ($(strip $(BOARD_NO_CHARGER_LED)),true)
+LOCAL_CFLAGS += -DNO_CHARGER_LED
+endif
+
 LOCAL_C_INCLUDES := bootable/recovery
 
 LOCAL_STATIC_LIBRARIES := libbatteryservice libbinder libminui libpng libz libutils libstdc++ libcutils liblog libm libc
@@ -62,7 +67,7 @@ endif
 LOCAL_HAL_STATIC_LIBRARIES := libhealthd
 
 ifeq ($(BOARD_USES_QCOM_HARDWARE),true)
-BOARD_HAL_STATIC_LIBRARIES ?= libhealthd.msm
+BOARD_HAL_STATIC_LIBRARIES ?= libhealthd.qcom
 endif
 
 # Symlink /charger to /sbin/healthd
diff --git a/healthd/BatteryMonitor.cpp b/healthd/BatteryMonitor.cpp
index 67a8ad0..86a4fc6 100644
--- a/healthd/BatteryMonitor.cpp
+++ b/healthd/BatteryMonitor.cpp
@@ -140,10 +140,14 @@ BatteryMonitor::PowerSupplyType BatteryMonitor::readPowerSupplyType(const String
             { "USB_ACA", ANDROID_POWER_SUPPLY_TYPE_AC },
             { "USB_HVDCP", ANDROID_POWER_SUPPLY_TYPE_AC },
             { "USB_HVDCP_3", ANDROID_POWER_SUPPLY_TYPE_AC },
+            { "USB_C", ANDROID_POWER_SUPPLY_TYPE_AC },
+            { "USB_PD", ANDROID_POWER_SUPPLY_TYPE_AC },
+            { "USB_PD_DRP", ANDROID_POWER_SUPPLY_TYPE_USB },
             { "Wireless", ANDROID_POWER_SUPPLY_TYPE_WIRELESS },
             { "Wipower", ANDROID_POWER_SUPPLY_TYPE_WIRELESS },
             { "DockBattery", ANDROID_POWER_SUPPLY_TYPE_DOCK_BATTERY },
             { "DockAC", ANDROID_POWER_SUPPLY_TYPE_DOCK_AC },
+            { "DASH", ANDROID_POWER_SUPPLY_TYPE_AC },
             { NULL, 0 },
     };
 
@@ -832,19 +836,15 @@ void BatteryMonitor::init(struct healthd_config *hc) {
         closedir(dir);
     }
 
-    // This indicates that there is no charger driver registered.
     // Typically the case for devices which do not have a battery and
     // and are always plugged into AC mains.
-    if (!mChargerNames.size()) {
-        KLOG_ERROR(LOG_TAG, "No charger supplies found\n");
-        mBatteryFixedCapacity = ALWAYS_PLUGGED_CAPACITY;
-        mBatteryFixedTemperature = FAKE_BATTERY_TEMPERATURE;
-        mAlwaysPluggedDevice = true;
-    }
     if (!mBatteryDevicePresent && !mDockBatteryDevicePresent) {
         KLOG_WARNING(LOG_TAG, "No battery devices found\n");
         hc->periodic_chores_interval_fast = -1;
         hc->periodic_chores_interval_slow = -1;
+        mBatteryFixedCapacity = ALWAYS_PLUGGED_CAPACITY;
+        mBatteryFixedTemperature = FAKE_BATTERY_TEMPERATURE;
+        mAlwaysPluggedDevice = true;
     } else {
         if (mHealthdConfig->batteryStatusPath.isEmpty())
             KLOG_WARNING(LOG_TAG, "BatteryStatusPath not found\n");
diff --git a/healthd/healthd_mode_charger.cpp b/healthd/healthd_mode_charger.cpp
index eb93d6a..6df9f12 100644
--- a/healthd/healthd_mode_charger.cpp
+++ b/healthd/healthd_mode_charger.cpp
@@ -82,6 +82,10 @@ char *locale;
 #define BLUE_LED_PATH           "/sys/class/leds/blue/brightness"
 #endif
 
+#ifndef BLINK_PATH
+#define BLINK_PATH              "/sys/class/leds/red/device/blink"
+#endif
+
 #define LOGE(x...) do { KLOG_ERROR("charger", x); } while (0)
 #define LOGW(x...) do { KLOG_WARNING("charger", x); } while (0)
 #define LOGV(x...) do { KLOG_DEBUG("charger", x); } while (0)
@@ -183,6 +187,7 @@ enum {
     BLUE_LED = 0x01 << 2,
 };
 
+#ifndef NO_CHARGER_LED
 struct led_ctl {
     int color;
     const char *path;
@@ -203,6 +208,7 @@ struct soc_led_color_mapping soc_leds[3] = {
     {90, RED_LED | GREEN_LED},
     {100, GREEN_LED},
 };
+#endif
 
 static struct charger charger_state;
 static struct healthd_config *healthd_config;
@@ -211,6 +217,27 @@ static int char_width;
 static int char_height;
 static bool minui_inited;
 
+#ifndef NO_CHARGER_LED
+static int set_blink(int val)
+{
+    int fd;
+    char buffer[10];
+
+    fd = open(BLINK_PATH, O_RDWR);
+    if (fd < 0) {
+        LOGE("Could not open blink file\n");
+        return -1;
+    }
+    snprintf(buffer, sizeof(buffer), "%d\n", val);
+    if (write(fd, buffer, strlen(buffer)) < 0) {
+        LOGE("Could not write to blink file\n");
+        close(fd);
+        return -1;
+    }
+    close(fd);
+    return 0;
+}
+
 static int set_tricolor_led(int on, int color)
 {
     int fd, i;
@@ -255,8 +282,12 @@ static int set_battery_soc_leds(int soc)
         LOGV("soc = %d, set led color 0x%x\n", soc, soc_leds[i].color);
     }
 
+    /* This is required to commit the changes to hardware */
+    set_blink(0);
+
     return 0;
 }
+#endif
 
 /* current time in milliseconds */
 static int64_t curr_time_ms(void)
@@ -667,14 +698,17 @@ static void handle_input_state(struct charger *charger, int64_t now)
 
 static void handle_power_supply_state(struct charger *charger, int64_t now)
 {
+#ifndef NO_CHARGER_LED
     static int old_soc = 0;
     int soc = 0;
+#endif
 
     if (!charger->have_battery_state)
         return;
 
     healthd_board_mode_charger_battery_update(batt_prop);
 
+#ifndef NO_CHARGER_LED
     if (batt_prop && batt_prop->batteryLevel >= 0) {
         soc = batt_prop->batteryLevel;
     }
@@ -683,6 +717,7 @@ static void handle_power_supply_state(struct charger *charger, int64_t now)
         old_soc = soc;
         set_battery_soc_leds(soc);
     }
+#endif
 
     if (!charger->charger_connected) {
 
diff --git a/include/android/log.h b/include/android/log.h
index 1c171b7..391c826 100644
--- a/include/android/log.h
+++ b/include/android/log.h
@@ -89,6 +89,11 @@ typedef enum android_LogPriority {
 } android_LogPriority;
 
 /*
+ * Release any logger resources (a new log write will immediately re-acquire)
+ */
+void __android_log_close();
+
+/*
  * Send a simple string to the log.
  */
 int __android_log_write(int prio, const char *tag, const char *text);
diff --git a/include/cutils/android_reboot.h b/include/cutils/android_reboot.h
index 85e1b7e..a3861a0 100644
--- a/include/cutils/android_reboot.h
+++ b/include/cutils/android_reboot.h
@@ -17,6 +17,8 @@
 #ifndef __CUTILS_ANDROID_REBOOT_H__
 #define __CUTILS_ANDROID_REBOOT_H__
 
+#include <mntent.h>
+
 __BEGIN_DECLS
 
 /* Commands */
@@ -28,6 +30,9 @@ __BEGIN_DECLS
 #define ANDROID_RB_PROPERTY "sys.powerctl"
 
 int android_reboot(int cmd, int flags, const char *arg);
+int android_reboot_with_callback(
+    int cmd, int flags, const char *arg,
+    void (*cb_on_remount)(const struct mntent*));
 
 __END_DECLS
 
diff --git a/include/sysutils/FrameworkListener.h b/include/sysutils/FrameworkListener.h
index 18049cd..2137069 100644
--- a/include/sysutils/FrameworkListener.h
+++ b/include/sysutils/FrameworkListener.h
@@ -32,6 +32,7 @@ private:
     int mCommandCount;
     bool mWithSeq;
     FrameworkCommandCollection *mCommands;
+    bool mSkipToNextNullByte;
 
 public:
     FrameworkListener(const char *socketName);
diff --git a/include/utils/Unicode.h b/include/utils/Unicode.h
index b76a5e2..4e17cc3 100644
--- a/include/utils/Unicode.h
+++ b/include/utils/Unicode.h
@@ -87,7 +87,7 @@ ssize_t utf32_to_utf8_length(const char32_t *src, size_t src_len);
  * "dst" becomes \xE3\x81\x82\xE3\x81\x84
  * (note that "dst" is NOT null-terminated, like strncpy)
  */
-void utf32_to_utf8(const char32_t* src, size_t src_len, char* dst);
+void utf32_to_utf8(const char32_t* src, size_t src_len, char* dst, size_t dst_len);
 
 /**
  * Returns the unicode value at "index".
@@ -109,7 +109,7 @@ ssize_t utf16_to_utf8_length(const char16_t *src, size_t src_len);
  * enough to fit the UTF-16 as measured by utf16_to_utf8_length with an added
  * NULL terminator.
  */
-void utf16_to_utf8(const char16_t* src, size_t src_len, char* dst);
+void utf16_to_utf8(const char16_t* src, size_t src_len, char* dst, size_t dst_len);
 
 /**
  * Returns the length of "src" when "src" is valid UTF-8 string.
diff --git a/init/Android.mk b/init/Android.mk
index aa32236..85dfbfc 100644
--- a/init/Android.mk
+++ b/init/Android.mk
@@ -68,6 +68,10 @@ ifneq ($(TARGET_IGNORE_RO_BOOT_REVISION),)
 LOCAL_CFLAGS += -DIGNORE_RO_BOOT_REVISION
 endif
 
+ifneq ($(TARGET_INIT_UMOUNT_AND_FSCK_IS_UNSAFE),)
+LOCAL_CFLAGS += -DUMOUNT_AND_FSCK_IS_UNSAFE
+endif
+
 LOCAL_MODULE:= init
 LOCAL_C_INCLUDES += \
     external/zlib \
diff --git a/init/builtins.cpp b/init/builtins.cpp
index b290ce3..1681d17 100644
--- a/init/builtins.cpp
+++ b/init/builtins.cpp
@@ -16,7 +16,9 @@
 
 #include <errno.h>
 #include <fcntl.h>
+#include <mntent.h>
 #include <net/if.h>
+#include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -38,6 +40,7 @@
 #include <base/stringprintf.h>
 #include <cutils/partition_utils.h>
 #include <cutils/android_reboot.h>
+#include <logwrap/logwrap.h>
 #include <private/android_filesystem_config.h>
 
 #include "init.h"
@@ -49,6 +52,8 @@
 #include "log.h"
 
 #define chmod DO_NOT_USE_CHMOD_USE_FCHMODAT_SYMLINK_NOFOLLOW
+#define UNMOUNT_CHECK_MS 5000
+#define UNMOUNT_CHECK_TIMES 10
 
 int add_environment(const char *name, const char *value);
 
@@ -109,6 +114,69 @@ static void service_start_if_not_disabled(struct service *svc)
     }
 }
 
+static void unmount_and_fsck(const struct mntent *entry)
+{
+#ifndef UMOUNT_AND_FSCK_IS_UNSAFE
+    if (strcmp(entry->mnt_type, "f2fs") && strcmp(entry->mnt_type, "ext4"))
+        return;
+
+    /* First, lazily unmount the directory. This unmount request finishes when
+     * all processes that open a file or directory in |entry->mnt_dir| exit.
+     */
+    TEMP_FAILURE_RETRY(umount2(entry->mnt_dir, MNT_DETACH));
+
+    /* Next, kill all processes except init, kthreadd, and kthreadd's
+     * children to finish the lazy unmount. Killing all processes here is okay
+     * because this callback function is only called right before reboot().
+     * It might be cleaner to selectively kill processes that actually use
+     * |entry->mnt_dir| rather than killing all, probably by reusing a function
+     * like killProcessesWithOpenFiles() in vold/, but the selinux policy does
+     * not allow init to scan /proc/<pid> files which the utility function
+     * heavily relies on. The policy does not allow the process to execute
+     * killall/pkill binaries either. Note that some processes might
+     * automatically restart after kill(), but that is not really a problem
+     * because |entry->mnt_dir| is no longer visible to such new processes.
+     */
+    service_for_each(service_stop);
+    TEMP_FAILURE_RETRY(kill(-1, SIGKILL));
+
+    int count = 0;
+    while (count++ < UNMOUNT_CHECK_TIMES) {
+        int fd = TEMP_FAILURE_RETRY(open(entry->mnt_fsname, O_RDONLY | O_EXCL));
+        if (fd >= 0) {
+            /* |entry->mnt_dir| has sucessfully been unmounted. */
+            close(fd);
+            break;
+        } else if (errno == EBUSY) {
+            /* Some processes using |entry->mnt_dir| are still alive. Wait for a
+             * while then retry.
+             */
+            TEMP_FAILURE_RETRY(
+                usleep(UNMOUNT_CHECK_MS * 1000 / UNMOUNT_CHECK_TIMES));
+            continue;
+        } else {
+            /* Cannot open the device. Give up. */
+            return;
+        }
+    }
+
+    int st;
+    if (!strcmp(entry->mnt_type, "f2fs")) {
+        const char *f2fs_argv[] = {
+            "/system/bin/fsck.f2fs", "-f", entry->mnt_fsname,
+        };
+        android_fork_execvp_ext(ARRAY_SIZE(f2fs_argv), (char **)f2fs_argv,
+                                &st, true, LOG_KLOG, true, NULL);
+    } else if (!strcmp(entry->mnt_type, "ext4")) {
+        const char *ext4_argv[] = {
+            "/system/bin/e2fsck", "-f", "-y", entry->mnt_fsname,
+        };
+        android_fork_execvp_ext(ARRAY_SIZE(ext4_argv), (char **)ext4_argv,
+                                &st, true, LOG_KLOG, true, NULL);
+    }
+#endif
+}
+
 int do_class_start(int nargs, char **args)
 {
     char prop[PROP_NAME_MAX];
@@ -577,6 +645,7 @@ int do_powerctl(int nargs, char **args)
     int len = 0;
     int cmd = 0;
     const char *reboot_target;
+    void (*callback_on_ro_remount)(const struct mntent*) = NULL;
 
     res = expand_props(command, args[1], sizeof(command));
     if (res) {
@@ -590,6 +659,7 @@ int do_powerctl(int nargs, char **args)
         }
         cmd = ANDROID_RB_POWEROFF;
         len = 8;
+        callback_on_ro_remount = unmount_and_fsck;
     } else if (strncmp(command, "reboot", 6) == 0) {
         cmd = ANDROID_RB_RESTART2;
         len = 6;
@@ -614,7 +684,8 @@ int do_powerctl(int nargs, char **args)
         return -EINVAL;
     }
 
-    return android_reboot(cmd, 0, reboot_target);
+    return android_reboot_with_callback(cmd, 0, reboot_target,
+                                        callback_on_ro_remount);
 }
 
 int do_trigger(int nargs, char **args)
diff --git a/init/init.cpp b/init/init.cpp
index 402331b..8ea42ca 100644
--- a/init/init.cpp
+++ b/init/init.cpp
@@ -642,7 +642,7 @@ static int wait_for_coldboot_done_action(int nargs, char **args) {
     // Any longer than 1s is an unreasonable length of time to delay booting.
     // If you're hitting this timeout, check that you didn't make your
     // sepolicy regular expressions too expensive (http://b/19899875).
-    if (wait_for_file(COLDBOOT_DONE, 1)) {
+    if (wait_for_file(COLDBOOT_DONE, 5)) {
         ERROR("Timed out waiting for %s\n", COLDBOOT_DONE);
     }
 
@@ -1012,8 +1012,10 @@ static int charging_mode_booting(void) {
     if (f < 0)
         return 0;
 
-    if (1 != read(f, (void *)&cmb,1))
+    if (1 != read(f, (void *)&cmb,1)) {
+        close(f);
         return 0;
+    }
 
     close(f);
     return ('1' == cmb);
diff --git a/libbacktrace/Backtrace.cpp b/libbacktrace/Backtrace.cpp
index 97f0ef4..42769ed 100644
--- a/libbacktrace/Backtrace.cpp
+++ b/libbacktrace/Backtrace.cpp
@@ -54,24 +54,8 @@ Backtrace::~Backtrace() {
   }
 }
 
-extern "C" char* __cxa_demangle(const char* mangled, char* buf, size_t* len,
-                                int* status);
-
 std::string Backtrace::GetFunctionName(uintptr_t pc, uintptr_t* offset) {
   std::string func_name = GetFunctionNameRaw(pc, offset);
-  if (!func_name.empty()) {
-#if defined(__APPLE__)
-    // Mac OS' __cxa_demangle demangles "f" as "float"; last tested on 10.7.
-    if (func_name[0] != '_') {
-      return func_name;
-    }
-#endif
-    char* name = __cxa_demangle(func_name.c_str(), 0, 0, 0);
-    if (name) {
-      func_name = name;
-      free(name);
-    }
-  }
   return func_name;
 }
 
diff --git a/libcutils/android_reboot.c b/libcutils/android_reboot.c
index 6ae23c1..af7e189 100644
--- a/libcutils/android_reboot.c
+++ b/libcutils/android_reboot.c
@@ -14,43 +14,108 @@
  * limitations under the License.
  */
 
-#include <unistd.h>
-#include <sys/reboot.h>
-#include <sys/syscall.h>
-#include <sys/types.h>
-#include <sys/stat.h>
+#include <errno.h>
 #include <fcntl.h>
 #include <mntent.h>
+#include <stdbool.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
+#include <sys/cdefs.h>
+#include <sys/mount.h>
+#include <sys/reboot.h>
+#include <sys/stat.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+#include <unistd.h>
 
 #include <cutils/android_reboot.h>
+#include <cutils/klog.h>
+#include <cutils/list.h>
 
-#define UNUSED __attribute__((unused))
+#define TAG "android_reboot"
+#define READONLY_CHECK_MS 5000
+#define READONLY_CHECK_TIMES 50
 
-/* Check to see if /proc/mounts contains any writeable filesystems
- * backed by a block device.
- * Return true if none found, else return false.
+typedef struct {
+    struct listnode list;
+    struct mntent entry;
+} mntent_list;
+
+static bool has_mount_option(const char* opts, const char* opt_to_find)
+{
+  bool ret = false;
+  char* copy = NULL;
+  char* opt;
+  char* rem;
+
+  while ((opt = strtok_r(copy ? NULL : (copy = strdup(opts)), ",", &rem))) {
+      if (!strcmp(opt, opt_to_find)) {
+          ret = true;
+          break;
+      }
+  }
+
+  free(copy);
+  return ret;
+}
+
+static bool is_block_device(const char* fsname)
+{
+    return !strncmp(fsname, "/dev/block", 10);
+}
+
+/* Find all read+write block devices in /proc/mounts and add them to
+ * |rw_entries|.
  */
-static int remount_ro_done(void)
+static void find_rw(struct listnode* rw_entries)
 {
     FILE* fp;
     struct mntent* mentry;
-    int found_rw_fs = 0;
 
     if ((fp = setmntent("/proc/mounts", "r")) == NULL) {
-        /* If we can't read /proc/mounts, just give up. */
-        return 1;
+        KLOG_WARNING(TAG, "Failed to open /proc/mounts.\n");
+        return;
     }
     while ((mentry = getmntent(fp)) != NULL) {
-        if (!strncmp(mentry->mnt_fsname, "/dev/block", 10) && strstr(mentry->mnt_opts, "rw,")) {
-            found_rw_fs = 1;
-            break;
+        if (is_block_device(mentry->mnt_fsname) &&
+            has_mount_option(mentry->mnt_opts, "rw")) {
+            mntent_list* item = (mntent_list*)calloc(1, sizeof(mntent_list));
+            item->entry = *mentry;
+            item->entry.mnt_fsname = strdup(mentry->mnt_fsname);
+            item->entry.mnt_dir = strdup(mentry->mnt_dir);
+            item->entry.mnt_type = strdup(mentry->mnt_type);
+            item->entry.mnt_opts = strdup(mentry->mnt_opts);
+            list_add_tail(rw_entries, &item->list);
         }
     }
     endmntent(fp);
+}
+
+static void free_entries(struct listnode* entries)
+{
+    struct listnode* node;
+    struct listnode* n;
+    list_for_each_safe(node, n, entries) {
+        mntent_list* item = node_to_item(node, mntent_list, list);
+        free(item->entry.mnt_fsname);
+        free(item->entry.mnt_dir);
+        free(item->entry.mnt_type);
+        free(item->entry.mnt_opts);
+        free(item);
+    }
+}
 
-    return !found_rw_fs;
+static mntent_list* find_item(struct listnode* rw_entries, const char* fsname_to_find)
+{
+    struct listnode* node;
+    list_for_each(node, rw_entries) {
+        mntent_list* item = node_to_item(node, mntent_list, list);
+        if (!strcmp(item->entry.mnt_fsname, fsname_to_find)) {
+            return item;
+        }
+    }
+    return NULL;
 }
 
 /* Remounting filesystems read-only is difficult when there are files
@@ -64,38 +129,92 @@ static int remount_ro_done(void)
  * repeatedly until there are no more writable filesystems mounted on
  * block devices.
  */
-static void remount_ro(void)
+static void remount_ro(void (*cb_on_remount)(const struct mntent*))
 {
-    int fd, cnt = 0;
+    int fd, cnt;
+    FILE* fp;
+    struct mntent* mentry;
+    struct listnode* node;
+
+    list_declare(rw_entries);
+    list_declare(ro_entries);
+
+    sync();
+    find_rw(&rw_entries);
 
     /* Trigger the remount of the filesystems as read-only,
      * which also marks them clean.
      */
-    fd = open("/proc/sysrq-trigger", O_WRONLY);
+    fd = TEMP_FAILURE_RETRY(open("/proc/sysrq-trigger", O_WRONLY));
     if (fd < 0) {
-        return;
+        KLOG_WARNING(TAG, "Failed to open sysrq-trigger.\n");
+        /* TODO: Try to remount each rw parition manually in readonly mode.
+         * This may succeed if no process is using the partition.
+         */
+        goto out;
+    }
+    if (TEMP_FAILURE_RETRY(write(fd, "u", 1)) != 1) {
+        close(fd);
+        KLOG_WARNING(TAG, "Failed to write to sysrq-trigger.\n");
+        /* TODO: The same. Manually remount the paritions. */
+        goto out;
     }
-    write(fd, "u", 1);
     close(fd);
 
-
     /* Now poll /proc/mounts till it's done */
-    while (!remount_ro_done() && (cnt < 50)) {
-        usleep(100000);
+    cnt = 0;
+    while (cnt < READONLY_CHECK_TIMES) {
+        if ((fp = setmntent("/proc/mounts", "r")) == NULL) {
+            /* If we can't read /proc/mounts, just give up. */
+            KLOG_WARNING(TAG, "Failed to open /proc/mounts.\n");
+            goto out;
+        }
+        while ((mentry = getmntent(fp)) != NULL) {
+            if (!is_block_device(mentry->mnt_fsname) ||
+                !has_mount_option(mentry->mnt_opts, "ro")) {
+                continue;
+            }
+            mntent_list* item = find_item(&rw_entries, mentry->mnt_fsname);
+            if (item) {
+                /* |item| has now been ro remounted. */
+                list_remove(&item->list);
+                list_add_tail(&ro_entries, &item->list);
+            }
+        }
+        endmntent(fp);
+        if (list_empty(&rw_entries)) {
+            /* All rw block devices are now readonly. */
+            break;
+        }
+        TEMP_FAILURE_RETRY(
+            usleep(READONLY_CHECK_MS * 1000 / READONLY_CHECK_TIMES));
         cnt++;
     }
 
-    return;
-}
+    list_for_each(node, &rw_entries) {
+        mntent_list* item = node_to_item(node, mntent_list, list);
+        KLOG_WARNING(TAG, "Failed to remount %s in readonly mode.\n",
+                     item->entry.mnt_fsname);
+    }
+
+    if (cb_on_remount) {
+        list_for_each(node, &ro_entries) {
+            mntent_list* item = node_to_item(node, mntent_list, list);
+            cb_on_remount(&item->entry);
+        }
+    }
 
+out:
+    free_entries(&rw_entries);
+    free_entries(&ro_entries);
+}
 
-int android_reboot(int cmd, int flags UNUSED, const char *arg)
+int android_reboot_with_callback(
+    int cmd, int flags __unused, const char *arg,
+    void (*cb_on_remount)(const struct mntent*))
 {
     int ret;
-
-    sync();
-    remount_ro();
-
+    remount_ro(cb_on_remount);
     switch (cmd) {
         case ANDROID_RB_RESTART:
             ret = reboot(RB_AUTOBOOT);
@@ -117,3 +236,7 @@ int android_reboot(int cmd, int flags UNUSED, const char *arg)
     return ret;
 }
 
+int android_reboot(int cmd, int flags, const char *arg)
+{
+    return android_reboot_with_callback(cmd, flags, arg, NULL);
+}
diff --git a/libcutils/ashmem-dev.c b/libcutils/ashmem-dev.c
index 3089a94..4a07d66 100644
--- a/libcutils/ashmem-dev.c
+++ b/libcutils/ashmem-dev.c
@@ -19,18 +19,119 @@
  * ashmem-enabled kernel. See ashmem-sim.c for the "fake" tmp-based version,
  * used by the simulator.
  */
+#define LOG_TAG "ashmem"
 
-#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <pthread.h>
 #include <string.h>
-#include <sys/types.h>
-#include <sys/stat.h>
 #include <sys/ioctl.h>
-#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
 
 #include <linux/ashmem.h>
+
 #include <cutils/ashmem.h>
+#include <log/log.h>
+
+#define ASHMEM_DEVICE "/dev/ashmem"
+
+/* ashmem identity */
+static dev_t __ashmem_rdev;
+/*
+ * If we trigger a signal handler in the middle of locked activity and the
+ * signal handler calls ashmem, we could get into a deadlock state.
+ */
+static pthread_mutex_t __ashmem_lock = PTHREAD_MUTEX_INITIALIZER;
+
+/* logistics of getting file descriptor for ashmem */
+static int __ashmem_open_locked()
+{
+    int ret;
+    struct stat st;
+
+    int fd = TEMP_FAILURE_RETRY(open(ASHMEM_DEVICE, O_RDWR));
+    if (fd < 0) {
+        return fd;
+    }
+
+    ret = TEMP_FAILURE_RETRY(fstat(fd, &st));
+    if (ret < 0) {
+        int save_errno = errno;
+        close(fd);
+        errno = save_errno;
+        return ret;
+    }
+    if (!S_ISCHR(st.st_mode) || !st.st_rdev) {
+        close(fd);
+        errno = ENOTTY;
+        return -1;
+    }
+
+    __ashmem_rdev = st.st_rdev;
+    return fd;
+}
 
-#define ASHMEM_DEVICE	"/dev/ashmem"
+static int __ashmem_open()
+{
+    int fd;
+
+    pthread_mutex_lock(&__ashmem_lock);
+    fd = __ashmem_open_locked();
+    pthread_mutex_unlock(&__ashmem_lock);
+
+    return fd;
+}
+
+/* Make sure file descriptor references ashmem, negative number means false */
+static int __ashmem_is_ashmem(int fd)
+{
+    dev_t rdev;
+    struct stat st;
+
+    if (TEMP_FAILURE_RETRY(fstat(fd, &st)) < 0) {
+        return -1;
+    }
+
+    rdev = 0; /* Too much complexity to sniff __ashmem_rdev */
+    if (S_ISCHR(st.st_mode) && st.st_rdev) {
+        pthread_mutex_lock(&__ashmem_lock);
+        rdev = __ashmem_rdev;
+        if (rdev) {
+            pthread_mutex_unlock(&__ashmem_lock);
+        } else {
+            int fd = __ashmem_open_locked();
+            if (fd < 0) {
+                pthread_mutex_unlock(&__ashmem_lock);
+                return -1;
+            }
+            rdev = __ashmem_rdev;
+            pthread_mutex_unlock(&__ashmem_lock);
+
+            close(fd);
+        }
+
+        if (st.st_rdev == rdev) {
+            return 0;
+        }
+    }
+
+    if (rdev) {
+        LOG_ALWAYS_FATAL("illegal fd=%d mode=0%o rdev=%d:%d expected 0%o %d:%d",
+          fd, st.st_mode, major(st.st_rdev), minor(st.st_rdev),
+          S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IRGRP,
+          major(rdev), minor(rdev));
+    } else {
+        LOG_ALWAYS_FATAL("illegal fd=%d mode=0%o rdev=%d:%d expected 0%o",
+          fd, st.st_mode, major(st.st_rdev), minor(st.st_rdev),
+          S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IRGRP);
+    }
+    /* NOTREACHED */
+
+    errno = ENOTTY;
+    return -1;
+}
 
 /*
  * ashmem_create_region - creates a new ashmem region and returns the file
@@ -41,50 +142,77 @@
  */
 int ashmem_create_region(const char *name, size_t size)
 {
-	int fd, ret;
+    int ret, save_errno;
 
-	fd = open(ASHMEM_DEVICE, O_RDWR);
-	if (fd < 0)
-		return fd;
+    int fd = __ashmem_open();
+    if (fd < 0) {
+        return fd;
+    }
 
-	if (name) {
-		char buf[ASHMEM_NAME_LEN] = {0};
+    if (name) {
+        char buf[ASHMEM_NAME_LEN] = {0};
 
-		strlcpy(buf, name, sizeof(buf));
-		ret = ioctl(fd, ASHMEM_SET_NAME, buf);
-		if (ret < 0)
-			goto error;
-	}
+        strlcpy(buf, name, sizeof(buf));
+        ret = TEMP_FAILURE_RETRY(ioctl(fd, ASHMEM_SET_NAME, buf));
+        if (ret < 0) {
+            goto error;
+        }
+    }
 
-	ret = ioctl(fd, ASHMEM_SET_SIZE, size);
-	if (ret < 0)
-		goto error;
+    ret = TEMP_FAILURE_RETRY(ioctl(fd, ASHMEM_SET_SIZE, size));
+    if (ret < 0) {
+        goto error;
+    }
 
-	return fd;
+    return fd;
 
 error:
-	close(fd);
-	return ret;
+    save_errno = errno;
+    close(fd);
+    errno = save_errno;
+    return ret;
 }
 
 int ashmem_set_prot_region(int fd, int prot)
 {
-	return ioctl(fd, ASHMEM_SET_PROT_MASK, prot);
+    int ret = __ashmem_is_ashmem(fd);
+    if (ret < 0) {
+        return ret;
+    }
+
+    return TEMP_FAILURE_RETRY(ioctl(fd, ASHMEM_SET_PROT_MASK, prot));
 }
 
 int ashmem_pin_region(int fd, size_t offset, size_t len)
 {
-	struct ashmem_pin pin = { offset, len };
-	return ioctl(fd, ASHMEM_PIN, &pin);
+    struct ashmem_pin pin = { offset, len };
+
+    int ret = __ashmem_is_ashmem(fd);
+    if (ret < 0) {
+        return ret;
+    }
+
+    return TEMP_FAILURE_RETRY(ioctl(fd, ASHMEM_PIN, &pin));
 }
 
 int ashmem_unpin_region(int fd, size_t offset, size_t len)
 {
-	struct ashmem_pin pin = { offset, len };
-	return ioctl(fd, ASHMEM_UNPIN, &pin);
+    struct ashmem_pin pin = { offset, len };
+
+    int ret = __ashmem_is_ashmem(fd);
+    if (ret < 0) {
+        return ret;
+    }
+
+    return TEMP_FAILURE_RETRY(ioctl(fd, ASHMEM_UNPIN, &pin));
 }
 
 int ashmem_get_size_region(int fd)
 {
-  return ioctl(fd, ASHMEM_GET_SIZE, NULL);
+    int ret = __ashmem_is_ashmem(fd);
+    if (ret < 0) {
+        return ret;
+    }
+
+    return TEMP_FAILURE_RETRY(ioctl(fd, ASHMEM_GET_SIZE, NULL));
 }
diff --git a/libcutils/ashmem-host.c b/libcutils/ashmem-host.c
index abc4f94..99a2759 100644
--- a/libcutils/ashmem-host.c
+++ b/libcutils/ashmem-host.c
@@ -73,8 +73,11 @@ int ashmem_get_size_region(int fd)
         return -1;
     }
 
-    // Check if this is an "ashmem" region.
-    // TODO: This is very hacky, and can easily break. We need some reliable indicator.
+    /*
+     * Check if this is an "ashmem" region.
+     * TODO: This is very hacky, and can easily break.
+     * We need some reliable indicator.
+     */
     if (!(buf.st_nlink == 0 && S_ISREG(buf.st_mode))) {
         errno = ENOTTY;
         return -1;
diff --git a/libcutils/sched_policy.c b/libcutils/sched_policy.c
index 70dc8c4..b302bef 100644
--- a/libcutils/sched_policy.c
+++ b/libcutils/sched_policy.c
@@ -53,8 +53,12 @@ static inline SchedPolicy _policy(SchedPolicy p)
 #define TIMER_SLACK_FG 50000
 
 static pthread_once_t the_once = PTHREAD_ONCE_INIT;
+static pthread_once_t sched_once = PTHREAD_ONCE_INIT;
+static pthread_once_t cpuset_once = PTHREAD_ONCE_INIT;
 
 static int __sys_supports_schedgroups = -1;
+static int __sys_supports_cpusets = -1;
+static char proc_name[32] = {0};
 
 // File descriptors open to /dev/cpuctl/../tasks, setup by initialize, or -1 on error.
 static int bg_cgroup_fd = -1;
@@ -65,15 +69,8 @@ static int system_bg_cpuset_fd = -1;
 static int bg_cpuset_fd = -1;
 static int fg_cpuset_fd = -1;
 
-/* Add tid to the scheduling group defined by the policy */
-static int add_tid_to_cgroup(int tid, int fd)
+static int write_tid_to_fd(int tid, int fd)
 {
-    if (fd < 0) {
-        SLOGE("add_tid_to_cgroup failed; fd=%d\n", fd);
-        errno = EINVAL;
-        return -1;
-    }
-
     // specialized itoa -- works for tid > 0
     char text[22];
     char *end = text + sizeof(text) - 1;
@@ -91,8 +88,42 @@ static int add_tid_to_cgroup(int tid, int fd)
          */
         if (errno == ESRCH)
                 return 0;
-        SLOGW("add_tid_to_cgroup failed to write '%s' (%s); fd=%d\n",
-              ptr, strerror(errno), fd);
+        return -1;
+    }
+
+    return 0;
+}
+
+/* Add tid to the scheduling group defined by the policy */
+static int add_tid_to_cgroup(int tid, int fd)
+{
+    if (fd < 0) {
+        SLOGE("%s add_tid_to_cgroup failed; fd=%d\n", proc_name, fd);
+        errno = EINVAL;
+        return -1;
+    }
+
+    if (write_tid_to_fd(tid, fd) != 0) {
+        SLOGW("%s add_tid_to_cgroup failed to write '%d' (%s); fd=%d\n",
+              proc_name, tid, strerror(errno), fd);
+        errno = EINVAL;
+        return -1;
+    }
+
+    return 0;
+}
+
+static int add_tid_to_cpuset(int tid, int fd)
+{
+    if (fd < 0) {
+        SLOGE("%s add_tid_to_cpuset failed; fd=%d\n", proc_name, fd);
+        errno = EINVAL;
+        return -1;
+    }
+
+    if (write_tid_to_fd(tid, fd) != 0) {
+        SLOGW("%s add_tid_to_cpuset failed to write '%d' (%s); fd=%d\n",
+              proc_name, tid, strerror(errno), fd);
         errno = EINVAL;
         return -1;
     }
@@ -101,34 +132,95 @@ static int add_tid_to_cgroup(int tid, int fd)
 }
 
 static void __initialize(void) {
+    int pfd;
+    int ptid = gettid();
+
+    sprintf(proc_name, "/proc/%d/cmdline", ptid);
+
+    pfd = open(proc_name, O_RDONLY);
+    memset(proc_name, 0, sizeof(proc_name));
+    if (pfd > 0) {
+        read(pfd, proc_name, sizeof(proc_name) - 1);
+        close(pfd);
+    }
+}
+
+static void __init_sched(void) {
     char* filename;
+
+    pthread_once(&the_once, __initialize);
+
     if (!access("/dev/cpuctl/tasks", F_OK)) {
         __sys_supports_schedgroups = 1;
 
         filename = "/dev/cpuctl/tasks";
         fg_cgroup_fd = open(filename, O_WRONLY | O_CLOEXEC);
         if (fg_cgroup_fd < 0) {
-            SLOGE("open of %s failed: %s\n", filename, strerror(errno));
+            SLOGE("%s open of %s failed: %s\n", proc_name, filename, strerror(errno));
+            __sys_supports_schedgroups = 0;
         }
 
         filename = "/dev/cpuctl/bg_non_interactive/tasks";
         bg_cgroup_fd = open(filename, O_WRONLY | O_CLOEXEC);
         if (bg_cgroup_fd < 0) {
-            SLOGE("open of %s failed: %s\n", filename, strerror(errno));
+            SLOGE("%s open of %s failed: %s\n", proc_name, filename, strerror(errno));
+            __sys_supports_schedgroups = 0;
+        }
+
+        if (!__sys_supports_schedgroups) {
+            close(bg_cgroup_fd);
+            bg_cgroup_fd = -1;
+
+            close(fg_cgroup_fd);
+            fg_cgroup_fd = -1;
         }
     } else {
         __sys_supports_schedgroups = 0;
     }
+}
+
+static void __init_cpuset(void) {
+    char *filename;
+
+    pthread_once(&the_once, __initialize);
 
 #ifdef USE_CPUSETS
     if (!access("/dev/cpuset/tasks", F_OK)) {
+        __sys_supports_cpusets = 1;
 
         filename = "/dev/cpuset/foreground/tasks";
         fg_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC);
+        if (fg_cpuset_fd < 0) {
+            SLOGE("%s open of %s failed %s\n", proc_name, filename, strerror(errno));
+            __sys_supports_cpusets = 0;
+        }
+
         filename = "/dev/cpuset/background/tasks";
         bg_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC);
+        if (bg_cpuset_fd < 0) {
+            SLOGE("%s open of %s failed %s\n", proc_name, filename, strerror(errno));
+            __sys_supports_cpusets = 0;
+        }
+
         filename = "/dev/cpuset/system-background/tasks";
         system_bg_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC);
+        if (system_bg_cpuset_fd < 0) {
+            SLOGE("%s open of %s failed %s\n", proc_name, filename, strerror(errno));
+            __sys_supports_cpusets = 0;
+        }
+
+        if (!__sys_supports_cpusets) {
+            close(fg_cpuset_fd);
+            fg_cpuset_fd = -1;
+
+            close(bg_cpuset_fd);
+            bg_cpuset_fd = -1;
+
+            close(system_bg_cpuset_fd);
+            system_bg_cpuset_fd = -1;
+        }
+    } else {
+        __sys_supports_cpusets = 0;
     }
 #endif
 
@@ -193,11 +285,11 @@ static int getSchedulerGroup(int tid, char* buf, size_t bufLen)
         return 0;
     }
 
-    SLOGE("Failed to find cpu subsys");
+    SLOGE("%s Failed to find cpu subsys", proc_name);
     fclose(fp);
     return -1;
  out_bad_data:
-    SLOGE("Bad cgroup data {%s}", lineBuf);
+    SLOGE("%s Bad cgroup data {%s}", proc_name, lineBuf);
     fclose(fp);
     return -1;
 #else
@@ -211,7 +303,8 @@ int get_sched_policy(int tid, SchedPolicy *policy)
     if (tid == 0) {
         tid = gettid();
     }
-    pthread_once(&the_once, __initialize);
+
+    pthread_once(&sched_once, __init_sched);
 
     if (__sys_supports_schedgroups) {
         char grpBuf[32];
@@ -250,8 +343,13 @@ int set_cpuset_policy(int tid, SchedPolicy policy)
     if (tid == 0) {
         tid = gettid();
     }
+
+    pthread_once(&cpuset_once, __init_cpuset);
+
+    if (!__sys_supports_cpusets)
+        return set_sched_policy(tid, policy);
+
     policy = _policy(policy);
-    pthread_once(&the_once, __initialize);
 
     int fd;
     switch (policy) {
@@ -271,7 +369,7 @@ int set_cpuset_policy(int tid, SchedPolicy policy)
         break;
     }
 
-    if (add_tid_to_cgroup(tid, fd) != 0) {
+    if (add_tid_to_cpuset(tid, fd) != 0) {
         if (errno != ESRCH && errno != ENOENT)
             return -errno;
     }
@@ -286,7 +384,8 @@ int set_sched_policy(int tid, SchedPolicy policy)
         tid = gettid();
     }
     policy = _policy(policy);
-    pthread_once(&the_once, __initialize);
+
+    pthread_once(&sched_once, __init_sched);
 
 #if POLICY_DEBUG
     char statfile[64];
diff --git a/liblog/logd_write.c b/liblog/logd_write.c
index bdee28f..9c4e481 100644
--- a/liblog/logd_write.c
+++ b/liblog/logd_write.c
@@ -323,6 +323,48 @@ const char *android_log_id_to_name(log_id_t log_id)
 }
 #endif
 
+/*
+ * Release any logger resources. A new log write will immediately re-acquire.
+ */
+void __android_log_close()
+{
+#if FAKE_LOG_DEVICE
+    int i;
+#endif
+
+#ifdef HAVE_PTHREADS
+    pthread_mutex_lock(&log_init_lock);
+#endif
+
+    write_to_log = __write_to_log_init;
+
+    /*
+     * Threads that are actively writing at this point are not held back
+     * by a lock and are at risk of dropping the messages with a return code
+     * -EBADF. Prefer to return error code than add the overhead of a lock to
+     * each log writing call to guarantee delivery. In addition, anyone
+     * calling this is doing so to release the logging resources and shut down,
+     * for them to do so with outstanding log requests in other threads is a
+     * disengenuous use of this function.
+     */
+#if FAKE_LOG_DEVICE
+    for (i = 0; i < LOG_ID_MAX; i++) {
+        fakeLogClose(log_fds[i]);
+        log_fds[i] = -1;
+    }
+#else
+    close(logd_fd);
+    logd_fd = -1;
+
+    close(pstore_fd);
+    pstore_fd = -1;
+#endif
+
+#ifdef HAVE_PTHREADS
+    pthread_mutex_unlock(&log_init_lock);
+#endif
+}
+
 static int __write_to_log_init(log_id_t log_id, struct iovec *vec, size_t nr)
 {
 #if !defined(_WIN32)
@@ -513,3 +555,42 @@ int __android_log_bswrite(int32_t tag, const char *payload)
 
     return write_to_log(LOG_ID_EVENTS, vec, 4);
 }
+
+#ifdef MTK_HARDWARE
+struct xlog_record {
+    const char *tag_str;
+    const char *fmt_str;
+    int prio;
+};
+
+void __attribute__((weak)) __xlog_buf_printf(__unused int bufid, const struct xlog_record *xlog_record, ...) {
+    va_list args;
+    va_start(args, xlog_record);
+#if    HAVE_LIBC_SYSTEM_PROPERTIES
+    int len = 0;
+    int do_xlog = 0;
+    char results[PROP_VALUE_MAX];
+
+
+    // MobileLog
+    len = __system_property_get ("debug.MB.running", results);
+    if (len && atoi(results))
+        do_xlog = 1;
+
+    // ModemLog
+    len = __system_property_get ("debug.mdlogger.Running", results);
+    if (len && atoi(results))
+        do_xlog = 1;
+
+    // Manual
+    len = __system_property_get ("persist.debug.xlog.enable", results);
+    if (len && atoi(results))
+        do_xlog = 1;
+
+    if (do_xlog > 0)
+#endif
+        __android_log_vprint(xlog_record->prio, xlog_record->tag_str, xlog_record->fmt_str, args);
+
+    return;
+}
+#endif
diff --git a/liblog/logd_write_kern.c b/liblog/logd_write_kern.c
index bd43238..f0c6cb2 100644
--- a/liblog/logd_write_kern.c
+++ b/liblog/logd_write_kern.c
@@ -106,6 +106,41 @@ static int __write_to_log_kernel(log_id_t log_id, struct iovec *vec, size_t nr)
     return ret;
 }
 
+/*
+ * Release any logger resources. A new log write will immediately re-acquire.
+ */
+void __android_log_close()
+{
+#ifdef HAVE_PTHREADS
+    pthread_mutex_lock(&log_init_lock);
+#endif
+
+    write_to_log = __write_to_log_init;
+
+    /*
+     * Threads that are actively writing at this point are not held back
+     * by a lock and are at risk of dropping the messages with a return code
+     * -EBADF. Prefer to return error code than add the overhead of a lock to
+     * each log writing call to guarantee delivery. In addition, anyone
+     * calling this is doing so to release the logging resources and shut down,
+     * for them to do so with outstanding log requests in other threads is a
+     * disengenuous use of this function.
+     */
+
+    log_close(log_fds[LOG_ID_MAIN]);
+    log_fds[LOG_ID_MAIN] = -1;
+    log_close(log_fds[LOG_ID_RADIO]);
+    log_fds[LOG_ID_RADIO] = -1;
+    log_close(log_fds[LOG_ID_EVENTS]);
+    log_fds[LOG_ID_EVENTS] = -1;
+    log_close(log_fds[LOG_ID_SYSTEM]);
+    log_fds[LOG_ID_SYSTEM] = -1;
+
+#ifdef HAVE_PTHREADS
+    pthread_mutex_unlock(&log_init_lock);
+#endif
+}
+
 static int __write_to_log_init(log_id_t log_id, struct iovec *vec, size_t nr)
 {
     pthread_mutex_lock(&log_init_lock);
diff --git a/liblog/tests/liblog_test.cpp b/liblog/tests/liblog_test.cpp
index c987041..0e7fec4 100644
--- a/liblog/tests/liblog_test.cpp
+++ b/liblog/tests/liblog_test.cpp
@@ -127,12 +127,17 @@ TEST(liblog, __android_log_btwrite__android_logger_list_read) {
     ASSERT_TRUE(NULL != (logger_list = android_logger_list_open(
         LOG_ID_EVENTS, ANDROID_LOG_RDONLY | ANDROID_LOG_NONBLOCK, 1000, pid)));
 
+    // Check that we can close and reopen the logger
     log_time ts(CLOCK_MONOTONIC);
-
     ASSERT_LT(0, __android_log_btwrite(0, EVENT_TYPE_LONG, &ts, sizeof(ts)));
+    __android_log_close();
+
+    log_time ts1(CLOCK_MONOTONIC);
+    ASSERT_LT(0, __android_log_btwrite(0, EVENT_TYPE_LONG, &ts1, sizeof(ts1)));
     usleep(1000000);
 
     int count = 0;
+    int second_count = 0;
 
     for (;;) {
         log_msg log_msg;
@@ -156,10 +161,13 @@ TEST(liblog, __android_log_btwrite__android_logger_list_read) {
         log_time tx(eventData + 4 + 1);
         if (ts == tx) {
             ++count;
+        } else if (ts1 == tx) {
+            ++second_count;
         }
     }
 
     EXPECT_EQ(1, count);
+    EXPECT_EQ(1, second_count);
 
     android_logger_list_close(logger_list);
 }
diff --git a/libnetutils/ifc_utils.c b/libnetutils/ifc_utils.c
index 3bd59c7..0bd7628 100644
--- a/libnetutils/ifc_utils.c
+++ b/libnetutils/ifc_utils.c
@@ -597,23 +597,26 @@ int ifc_disable(const char *ifname)
 int ifc_reset_connections(const char *ifname, const int reset_mask)
 {
 #ifdef HAVE_ANDROID_OS
-    int result, success;
+    int result = 0, success;
     in_addr_t myaddr = 0;
     struct ifreq ifr;
     struct in6_ifreq ifr6;
+    int ctl_sock = -1;
 
     if (reset_mask & RESET_IPV4_ADDRESSES) {
         /* IPv4. Clear connections on the IP address. */
-        ifc_init();
-        if (!(reset_mask & RESET_IGNORE_INTERFACE_ADDRESS)) {
-            ifc_get_info(ifname, &myaddr, NULL, NULL);
+        ctl_sock = socket(AF_INET, SOCK_DGRAM, 0);
+        if (ctl_sock >= 0) {
+            if (!(reset_mask & RESET_IGNORE_INTERFACE_ADDRESS)) {
+                ifc_get_info(ifname, &myaddr, NULL, NULL);
+            }
+            ifc_init_ifr(ifname, &ifr);
+            init_sockaddr_in(&ifr.ifr_addr, myaddr);
+            result = ioctl(ctl_sock, SIOCKILLADDR,  &ifr);
+            close(ctl_sock);
+        } else {
+            result = -1;
         }
-        ifc_init_ifr(ifname, &ifr);
-        init_sockaddr_in(&ifr.ifr_addr, myaddr);
-        result = ioctl(ifc_ctl_sock, SIOCKILLADDR,  &ifr);
-        ifc_close();
-    } else {
-        result = 0;
     }
 
     if (reset_mask & RESET_IPV6_ADDRESSES) {
@@ -623,14 +626,18 @@ int ifc_reset_connections(const char *ifname, const int reset_mask)
          * So we clear all unused IPv6 connections on the device by specifying an
          * empty IPv6 address.
          */
-        ifc_init6();
+        ctl_sock = socket(AF_INET6, SOCK_DGRAM, 0);
         // This implicitly specifies an address of ::, i.e., kill all IPv6 sockets.
         memset(&ifr6, 0, sizeof(ifr6));
-        success = ioctl(ifc_ctl_sock6, SIOCKILLADDR,  &ifr6);
-        if (result == 0) {
-            result = success;
+        if (ctl_sock >= 0) {
+            success = ioctl(ctl_sock, SIOCKILLADDR,  &ifr6);
+            if (result == 0) {
+                result = success;
+            }
+            close(ctl_sock);
+        } else {
+            result = -1;
         }
-        ifc_close6();
     }
 
     return result;
diff --git a/libsysutils/src/FrameworkListener.cpp b/libsysutils/src/FrameworkListener.cpp
index e7b3dd6..579ead9 100644
--- a/libsysutils/src/FrameworkListener.cpp
+++ b/libsysutils/src/FrameworkListener.cpp
@@ -49,6 +49,7 @@ void FrameworkListener::init(const char *socketName UNUSED, bool withSeq) {
     errorRate = 0;
     mCommandCount = 0;
     mWithSeq = withSeq;
+    mSkipToNextNullByte = false;
 }
 
 bool FrameworkListener::onDataAvailable(SocketClient *c) {
@@ -59,10 +60,15 @@ bool FrameworkListener::onDataAvailable(SocketClient *c) {
     if (len < 0) {
         SLOGE("read() failed (%s)", strerror(errno));
         return false;
-    } else if (!len)
+    } else if (!len) {
         return false;
-   if(buffer[len-1] != '\0')
+    } else if (buffer[len-1] != '\0') {
         SLOGW("String is not zero-terminated");
+        android_errorWriteLog(0x534e4554, "29831647");
+        c->sendMsg(500, "Command too large for buffer", false);
+        mSkipToNextNullByte = true;
+        return false;
+    }
 
     int offset = 0;
     int i;
@@ -70,11 +76,16 @@ bool FrameworkListener::onDataAvailable(SocketClient *c) {
     for (i = 0; i < len; i++) {
         if (buffer[i] == '\0') {
             /* IMPORTANT: dispatchCommand() expects a zero-terminated string */
-            dispatchCommand(c, buffer + offset);
+            if (mSkipToNextNullByte) {
+                mSkipToNextNullByte = false;
+            } else {
+                dispatchCommand(c, buffer + offset);
+            }
             offset = i + 1;
         }
     }
 
+    mSkipToNextNullByte = false;
     return true;
 }
 
diff --git a/libutils/String8.cpp b/libutils/String8.cpp
index ad65fdb..75dfa29 100644
--- a/libutils/String8.cpp
+++ b/libutils/String8.cpp
@@ -102,20 +102,21 @@ static char* allocFromUTF16(const char16_t* in, size_t len)
 {
     if (len == 0) return getEmptyString();
 
-    const ssize_t bytes = utf16_to_utf8_length(in, len);
-    if (bytes < 0) {
+     // Allow for closing '\0'
+    const ssize_t resultStrLen = utf16_to_utf8_length(in, len) + 1;
+    if (resultStrLen < 1) {
         return getEmptyString();
     }
 
-    SharedBuffer* buf = SharedBuffer::alloc(bytes+1);
+    SharedBuffer* buf = SharedBuffer::alloc(resultStrLen);
     ALOG_ASSERT(buf, "Unable to allocate shared buffer");
     if (!buf) {
         return getEmptyString();
     }
 
-    char* str = (char*)buf->data();
-    utf16_to_utf8(in, len, str);
-    return str;
+    char* resultStr = (char*)buf->data();
+    utf16_to_utf8(in, len, resultStr, resultStrLen);
+    return resultStr;
 }
 
 static char* allocFromUTF32(const char32_t* in, size_t len)
@@ -124,21 +125,21 @@ static char* allocFromUTF32(const char32_t* in, size_t len)
         return getEmptyString();
     }
 
-    const ssize_t bytes = utf32_to_utf8_length(in, len);
-    if (bytes < 0) {
+    const ssize_t resultStrLen = utf32_to_utf8_length(in, len) + 1;
+    if (resultStrLen < 1) {
         return getEmptyString();
     }
 
-    SharedBuffer* buf = SharedBuffer::alloc(bytes+1);
+    SharedBuffer* buf = SharedBuffer::alloc(resultStrLen);
     ALOG_ASSERT(buf, "Unable to allocate shared buffer");
     if (!buf) {
         return getEmptyString();
     }
 
-    char* str = (char*) buf->data();
-    utf32_to_utf8(in, len, str);
+    char* resultStr = (char*) buf->data();
+    utf32_to_utf8(in, len, resultStr, resultStrLen);
 
-    return str;
+    return resultStr;
 }
 
 // ---------------------------------------------------------------------------
diff --git a/libutils/SystemClock.cpp b/libutils/SystemClock.cpp
index c3b5d74..28ea817 100644
--- a/libutils/SystemClock.cpp
+++ b/libutils/SystemClock.cpp
@@ -121,9 +121,11 @@ int64_t elapsedRealtimeNano()
 #endif
 
     static int s_fd = -1;
+    bool need_unlock = false;
 
     if (clock_method < 0) {
         pthread_mutex_lock(&clock_lock);
+        need_unlock = true;
     }
 
     if (clock_method < 0 || clock_method == METHOD_IOCTL) {
@@ -143,6 +145,8 @@ int64_t elapsedRealtimeNano()
                 checkTimeStamps(timestamp, &prevTimestamp, &prevMethod, METHOD_IOCTL);
                 if (clock_method < 0) {
                     clock_method = METHOD_IOCTL;
+                }
+                if (need_unlock) {
                     pthread_mutex_unlock(&clock_lock);
                 }
                 return timestamp;
@@ -159,6 +163,8 @@ int64_t elapsedRealtimeNano()
                             METHOD_CLOCK_GETTIME);
             if (clock_method < 0) {
                 clock_method = METHOD_CLOCK_GETTIME;
+            }
+            if (need_unlock) {
                 pthread_mutex_unlock(&clock_lock);
             }
             return timestamp;
@@ -173,6 +179,8 @@ int64_t elapsedRealtimeNano()
                     METHOD_SYSTEMTIME);
     if (clock_method < 0) {
         clock_method = METHOD_SYSTEMTIME;
+    }
+    if (need_unlock) {
         pthread_mutex_unlock(&clock_lock);
     }
     return timestamp;
diff --git a/libutils/Unicode.cpp b/libutils/Unicode.cpp
index fb876c9..2b5293e 100644
--- a/libutils/Unicode.cpp
+++ b/libutils/Unicode.cpp
@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#include <log/log.h>
 #include <utils/Unicode.h>
 
 #include <stddef.h>
@@ -182,7 +183,7 @@ ssize_t utf32_to_utf8_length(const char32_t *src, size_t src_len)
     return ret;
 }
 
-void utf32_to_utf8(const char32_t* src, size_t src_len, char* dst)
+void utf32_to_utf8(const char32_t* src, size_t src_len, char* dst, size_t dst_len)
 {
     if (src == NULL || src_len == 0 || dst == NULL) {
         return;
@@ -193,9 +194,12 @@ void utf32_to_utf8(const char32_t* src, size_t src_len, char* dst)
     char *cur = dst;
     while (cur_utf32 < end_utf32) {
         size_t len = utf32_codepoint_utf8_length(*cur_utf32);
+        LOG_ALWAYS_FATAL_IF(dst_len < len, "%zu < %zu", dst_len, len);
         utf32_codepoint_to_utf8((uint8_t *)cur, *cur_utf32++, len);
         cur += len;
+        dst_len -= len;
     }
+    LOG_ALWAYS_FATAL_IF(dst_len < 1, "dst_len < 1: %zu < 1", dst_len);
     *cur = '\0';
 }
 
@@ -324,7 +328,7 @@ int strzcmp16_h_n(const char16_t *s1H, size_t n1, const char16_t *s2N, size_t n2
            : 0);
 }
 
-void utf16_to_utf8(const char16_t* src, size_t src_len, char* dst)
+void utf16_to_utf8(const char16_t* src, size_t src_len, char* dst, size_t dst_len)
 {
     if (src == NULL || src_len == 0 || dst == NULL) {
         return;
@@ -345,9 +349,12 @@ void utf16_to_utf8(const char16_t* src, size_t src_len, char* dst)
             utf32 = (char32_t) *cur_utf16++;
         }
         const size_t len = utf32_codepoint_utf8_length(utf32);
+        LOG_ALWAYS_FATAL_IF(dst_len < len, "%zu < %zu", dst_len, len);
         utf32_codepoint_to_utf8((uint8_t*)cur, utf32, len);
         cur += len;
+        dst_len -= len;
     }
+    LOG_ALWAYS_FATAL_IF(dst_len < 1, "%zu < 1", dst_len);
     *cur = '\0';
 }
 
@@ -408,10 +415,10 @@ ssize_t utf16_to_utf8_length(const char16_t *src, size_t src_len)
     const char16_t* const end = src + src_len;
     while (src < end) {
         if ((*src & 0xFC00) == 0xD800 && (src + 1) < end
-                && (*++src & 0xFC00) == 0xDC00) {
+                && (*(src + 1) & 0xFC00) == 0xDC00) {
             // surrogate pairs are always 4 bytes.
             ret += 4;
-            src++;
+            src += 2;
         } else {
             ret += utf32_codepoint_utf8_length((char32_t) *src++);
         }
diff --git a/libutils/tests/String8_test.cpp b/libutils/tests/String8_test.cpp
index c42c68d..7cd67d3 100644
--- a/libutils/tests/String8_test.cpp
+++ b/libutils/tests/String8_test.cpp
@@ -17,6 +17,7 @@
 #define LOG_TAG "String8_test"
 #include <utils/Log.h>
 #include <utils/String8.h>
+#include <utils/String16.h>
 
 #include <gtest/gtest.h>
 
@@ -72,4 +73,22 @@ TEST_F(String8Test, OperatorPlusEquals) {
     EXPECT_STREQ(src3, " Verify me.");
 }
 
+// http://b/29250543
+TEST_F(String8Test, CorrectInvalidSurrogate) {
+    // d841d8 is an invalid start for a surrogate pair. Make sure this is handled by ignoring the
+    // first character in the pair and handling the rest correctly.
+    String16 string16(u"\xd841\xd841\xdc41\x0000");
+    String8 string8(string16);
+
+    EXPECT_EQ(4U, string8.length());
+}
+
+TEST_F(String8Test, CheckUtf32Conversion) {
+    // Since bound checks were added, check the conversion can be done without fatal errors.
+    // The utf8 lengths of these are chars are 1 + 2 + 3 + 4 = 10.
+    const char32_t string32[] = U"\x0000007f\x000007ff\x0000911\x0010fffe";
+    String8 string8(string32);
+    EXPECT_EQ(10U, string8.length());
+}
+
 }
diff --git a/logwrapper/logwrap.c b/logwrapper/logwrap.c
index 83576fb..44455d1 100644
--- a/logwrapper/logwrap.c
+++ b/logwrapper/logwrap.c
@@ -355,7 +355,8 @@ static int parent(const char *tag, int parent_read, pid_t pid,
         }
 
         if (poll_fds[0].revents & POLLIN) {
-            sz = read(parent_read, &buffer[b], sizeof(buffer) - 1 - b);
+            sz = TEMP_FAILURE_RETRY(
+                read(parent_read, &buffer[b], sizeof(buffer) - 1 - b));
 
             sz += b;
             // Log one line at a time
@@ -490,7 +491,7 @@ int android_fork_execvp_ext(int argc, char* argv[], int *status, bool ignore_int
     }
 
     /* Use ptty instead of socketpair so that STDOUT is not buffered */
-    parent_ptty = open("/dev/ptmx", O_RDWR);
+    parent_ptty = TEMP_FAILURE_RETRY(open("/dev/ptmx", O_RDWR));
     if (parent_ptty < 0) {
         ERROR("Cannot create parent ptty\n");
         rc = -1;
@@ -505,7 +506,7 @@ int android_fork_execvp_ext(int argc, char* argv[], int *status, bool ignore_int
         goto err_ptty;
     }
 
-    child_ptty = open(child_devname, O_RDWR);
+    child_ptty = TEMP_FAILURE_RETRY(open(child_devname, O_RDWR));
     if (child_ptty < 0) {
         ERROR("Cannot open child_ptty\n");
         rc = -1;
diff --git a/rootdir/init.rc b/rootdir/init.rc
index 78adacc..1c6fca6 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -559,6 +559,11 @@ on property:sys.sysctl.extra_free_kbytes=*
 on property:sys.sysctl.tcp_def_init_rwnd=*
     write /proc/sys/net/ipv4/tcp_default_init_rwnd ${sys.sysctl.tcp_def_init_rwnd}
 
+on property:security.perf_harden=0
+    write /proc/sys/kernel/perf_event_paranoid 1
+
+on property:security.perf_harden=1
+    write /proc/sys/kernel/perf_event_paranoid 3
 
 ## Daemon processes to be run by init.
 ##
@@ -693,6 +698,7 @@ service bootanim /system/bin/bootanimation
     group graphics audio
     disabled
     oneshot
+    writepid /dev/cpuset/system-background/tasks
 
 service gatekeeperd /system/bin/gatekeeperd /data/misc/gatekeeper
     class late_start
diff --git a/rootdir/ueventd.rc b/rootdir/ueventd.rc
index f82d899..67eaabc 100644
--- a/rootdir/ueventd.rc
+++ b/rootdir/ueventd.rc
@@ -99,42 +99,3 @@ subsystem adf
 # DVB API device nodes
 /dev/dvb*                 0660   root       system
 
-# Governor permissions
-/sys/devices/system/cpu/cpu*   cpufreq/scaling_governor   0664  system system
-
-/sys/devices/system/cpu/cpufreq ondemand/boostfreq   0664    system  system
-/sys/devices/system/cpu/cpufreq ondemand/boostpulse  0664    system  system
-/sys/devices/system/cpu/cpufreq ondemand/boosttime   0664    system  system
-/sys/devices/system/cpu/cpufreq ondemand/down_differential   0664    system  system
-/sys/devices/system/cpu/cpufreq ondemand/down_differential_multi_core   0664    system  system
-/sys/devices/system/cpu/cpufreq ondemand/ignore_nice_load   0664    system  system
-/sys/devices/system/cpu/cpufreq ondemand/input_boost   0664    system  system
-/sys/devices/system/cpu/cpufreq ondemand/io_is_busy      0664    system  system
-/sys/devices/system/cpu/cpufreq ondemand/optimal_freq   0664    system  system
-/sys/devices/system/cpu/cpufreq ondemand/powersave_bias  0664    system  system
-/sys/devices/system/cpu/cpufreq ondemand/sampling_down_factor    0664    system  system
-/sys/devices/system/cpu/cpufreq ondemand/sampling_rate   0664    system  system
-/sys/devices/system/cpu/cpufreq ondemand/sampling_rate_min   0664    system  system
-/sys/devices/system/cpu/cpufreq ondemand/sync_freq   0664    system  system
-/sys/devices/system/cpu/cpufreq ondemand/up_threshold   0664    system  system
-/sys/devices/system/cpu/cpufreq ondemand/up_threshold_any_cpu_load   0664    system  system
-/sys/devices/system/cpu/cpufreq ondemand/up_threshold_multi_core   0664    system  system
-
-/sys/devices/system/cpu/cpufreq interactive/above_hispeed_delay 0664    system  system
-/sys/devices/system/cpu/cpufreq interactive/align_windows 0664    system  system
-/sys/devices/system/cpu/cpufreq interactive/boost  0664    system  system
-/sys/devices/system/cpu/cpufreq interactive/boostpulse  0664    system  system
-/sys/devices/system/cpu/cpufreq interactive/boostpulse_duration  0664    system  system
-/sys/devices/system/cpu/cpufreq interactive/go_hispeed_load 0664    system  system
-/sys/devices/system/cpu/cpufreq interactive/hispeed_freq    0664    system  system
-/sys/devices/system/cpu/cpufreq interactive/io_is_busy      0664    system  system
-/sys/devices/system/cpu/cpufreq interactive/max_freq_hysteresis 0664    system  system
-/sys/devices/system/cpu/cpufreq interactive/min_sample_rate 0664    system  system
-/sys/devices/system/cpu/cpufreq interactive/min_sample_time 0664    system  system
-/sys/devices/system/cpu/cpufreq interactive/sampling_down_factor 0664    system  system
-/sys/devices/system/cpu/cpufreq interactive/sync_freq 0664    system  system
-/sys/devices/system/cpu/cpufreq interactive/target_loads 0664    system  system
-/sys/devices/system/cpu/cpufreq interactive/timer_rate  0664    system  system
-/sys/devices/system/cpu/cpufreq interactive/timer_slack      0664    system  system
-/sys/devices/system/cpu/cpufreq interactive/up_threshold_any_cpu_freq      0664    system  system
-/sys/devices/system/cpu/cpufreq interactive/up_threshold_any_cpu_load      0664    system  system
diff --git a/sdcard/sdcard.c b/sdcard/sdcard.c
index 33b1509..227982c 100644
--- a/sdcard/sdcard.c
+++ b/sdcard/sdcard.c
@@ -41,6 +41,7 @@
 #include <cutils/hashmap.h>
 #include <cutils/log.h>
 #include <cutils/multiuser.h>
+#include <cutils/properties.h>
 
 #include <private/android_filesystem_config.h>
 
@@ -337,7 +338,7 @@ static ssize_t get_node_path_locked(struct node* node, char* buf, size_t bufsize
 
     ssize_t pathlen = 0;
     if (node->parent && node->graft_path == NULL) {
-        pathlen = get_node_path_locked(node->parent, buf, bufsize - namelen - 2);
+        pathlen = get_node_path_locked(node->parent, buf, bufsize - namelen - 1);
         if (pathlen < 0) {
             return -1;
         }
@@ -1776,24 +1777,39 @@ static int usage() {
     return 1;
 }
 
-static int fuse_setup(struct fuse* fuse, gid_t gid, mode_t mask) {
+static int fuse_setup(struct fuse* fuse, gid_t gid, mode_t mask, bool use_sdcardfs) {
     char opts[256];
 
-    fuse->fd = open("/dev/fuse", O_RDWR);
-    if (fuse->fd == -1) {
-        ERROR("failed to open fuse device: %s\n", strerror(errno));
-        return -1;
+    if (!use_sdcardfs) {
+        fuse->fd = open("/dev/fuse", O_RDWR);
+        if (fuse->fd == -1) {
+            ERROR("failed to open fuse device: %s\n", strerror(errno));
+            return -1;
+        }
     }
 
     umount2(fuse->dest_path, MNT_DETACH);
 
-    snprintf(opts, sizeof(opts),
-            "fd=%i,rootmode=40000,default_permissions,allow_other,user_id=%d,group_id=%d",
-            fuse->fd, fuse->global->uid, fuse->global->gid);
-    if (mount("/dev/fuse", fuse->dest_path, "fuse", MS_NOSUID | MS_NODEV | MS_NOEXEC |
-            MS_NOATIME, opts) != 0) {
-        ERROR("failed to mount fuse filesystem: %s\n", strerror(errno));
-        return -1;
+    if (use_sdcardfs) {
+        snprintf(opts, sizeof(opts),
+                "%sfsuid=%u,fsgid=%u,userid=%d,gid=%u,mask=%u,reserved_mb=20",
+                (fuse->global->multi_user ? "multiuser," : ""),
+                fuse->global->uid, fuse->global->gid,
+                fuse->global->root.userid, gid, mask);
+        if (mount(fuse->global->source_path, fuse->dest_path, "sdcardfs",
+                    MS_NOSUID | MS_NODEV | MS_NOEXEC | MS_NOATIME, opts) != 0) {
+            ERROR("failed to mount sdcardfs filesystem: %s\n",  strerror(errno));
+            return -1;
+        }
+    } else {
+        snprintf(opts, sizeof(opts),
+                "fd=%i,rootmode=40000,default_permissions,allow_other,user_id=%d,group_id=%d",
+                fuse->fd, fuse->global->uid, fuse->global->gid);
+        if (mount("/dev/fuse", fuse->dest_path, "fuse", MS_NOSUID | MS_NODEV | MS_NOEXEC |
+                MS_NOATIME, opts) != 0) {
+            ERROR("failed to mount fuse filesystem: %s\n", strerror(errno));
+            return -1;
+        }
     }
 
     fuse->gid = gid;
@@ -1803,7 +1819,7 @@ static int fuse_setup(struct fuse* fuse, gid_t gid, mode_t mask) {
 }
 
 static void run(const char* source_path, const char* label, uid_t uid,
-        gid_t gid, userid_t userid, bool multi_user, bool full_write) {
+        gid_t gid, userid_t userid, bool multi_user, bool full_write, bool use_sdcardfs) {
     struct fuse_global global;
     struct fuse fuse_default;
     struct fuse fuse_read;
@@ -1875,9 +1891,9 @@ static void run(const char* source_path, const char* label, uid_t uid,
     if (multi_user) {
         /* Multi-user storage is fully isolated per user, so "other"
          * permissions are completely masked off. */
-        if (fuse_setup(&fuse_default, AID_SDCARD_RW, 0006)
-                || fuse_setup(&fuse_read, AID_EVERYBODY, 0027)
-                || fuse_setup(&fuse_write, AID_EVERYBODY, full_write ? 0007 : 0027)) {
+        if (fuse_setup(&fuse_default, AID_SDCARD_RW, 0006, use_sdcardfs)
+                || fuse_setup(&fuse_read, AID_EVERYBODY, 0027, use_sdcardfs)
+                || fuse_setup(&fuse_write, AID_EVERYBODY, full_write ? 0007 : 0027, use_sdcardfs)) {
             ERROR("failed to fuse_setup\n");
             exit(1);
         }
@@ -1885,9 +1901,9 @@ static void run(const char* source_path, const char* label, uid_t uid,
         /* Physical storage is readable by all users on device, but
          * the Android directories are masked off to a single user
          * deep inside attr_from_stat(). */
-        if (fuse_setup(&fuse_default, AID_SDCARD_RW, 0006)
-                || fuse_setup(&fuse_read, AID_EVERYBODY, full_write ? 0027 : 0022)
-                || fuse_setup(&fuse_write, AID_EVERYBODY, full_write ? 0007 : 0022)) {
+        if (fuse_setup(&fuse_default, AID_SDCARD_RW, 0006, use_sdcardfs)
+                || fuse_setup(&fuse_read, AID_EVERYBODY, full_write ? 0027 : 0022, use_sdcardfs)
+                || fuse_setup(&fuse_write, AID_EVERYBODY, full_write ? 0007 : 0022, use_sdcardfs)) {
             ERROR("failed to fuse_setup\n");
             exit(1);
         }
@@ -1911,6 +1927,11 @@ static void run(const char* source_path, const char* label, uid_t uid,
         fs_prepare_dir(global.obb_path, 0775, uid, gid);
     }
 
+    // Nothing else for us to do if sdcardfs is in use!
+    if (use_sdcardfs) {
+        exit(0);
+    }
+
     if (pthread_create(&thread_default, NULL, start_handler, &handler_default)
             || pthread_create(&thread_read, NULL, start_handler, &handler_read)
             || pthread_create(&thread_write, NULL, start_handler, &handler_write)) {
@@ -1995,6 +2016,8 @@ int sdcard_main(int argc, char **argv) {
         sleep(1);
     }
 
-    run(source_path, label, uid, gid, userid, multi_user, full_write);
+    bool use_sdcardfs = property_get_bool("ro.sdcardfs.enable", false);
+
+    run(source_path, label, uid, gid, userid, multi_user, full_write, use_sdcardfs);
     return 1;
 }