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Fix Deadlock Issue On AppFuseBridge

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There are two locks used by AppFuseBridge.
First is it's object lock, and the second is a mutex lock in app fuse library.
There are two oppsite routines to get those locks.

  (Thread A) Got Java lock -> Try to get Native lock
  (Thread B)        Got Native lock -> Try to get Java lock

Bug : https://issuetracker.google.com/issues/145707568
Signed-off-by: hyeeun.jun@samsung.com <hyeeun.jun@samsung.com>

The order must be followed to obtain two locks.
If not, the dead lock will be caused.
Therefore we change the routine to get the mutex lock first, and the object lock later.
This commit is contained in:
hyeeun.jun@samsung.com 2020-01-29 17:10:17 +09:00 committed by Hyeeun Jun
parent e87527faa3
commit 49545ab897
2 changed files with 17 additions and 3 deletions
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14
libappfuse/FuseBridgeLoop.cc
View file

@ -311,6 +311,8 @@ class BridgeEpollController : private EpollController {
}
};
std::recursive_mutex FuseBridgeLoop::mutex_;
FuseBridgeLoop::FuseBridgeLoop() : opened_(true) {
base::unique_fd epoll_fd(epoll_create1(EPOLL_CLOEXEC));
if (epoll_fd.get() == -1) {
@ -328,7 +330,7 @@ bool FuseBridgeLoop::AddBridge(int mount_id, base::unique_fd dev_fd, base::uniqu
std::unique_ptr<FuseBridgeEntry> bridge(
new FuseBridgeEntry(mount_id, std::move(dev_fd), std::move(proxy_fd)));
std::lock_guard<std::mutex> lock(mutex_);
std::lock_guard<std::recursive_mutex> lock(mutex_);
if (!opened_) {
LOG(ERROR) << "Tried to add a mount to a closed bridge";
return false;
@ -372,7 +374,7 @@ void FuseBridgeLoop::Start(FuseBridgeLoopCallback* callback) {
const bool wait_result = epoll_controller_->Wait(bridges_.size(), &entries);
LOG(VERBOSE) << "Receive epoll events";
{
std::lock_guard<std::mutex> lock(mutex_);
std::lock_guard<std::recursive_mutex> lock(mutex_);
if (!(wait_result && ProcessEventLocked(entries, callback))) {
for (auto it = bridges_.begin(); it != bridges_.end();) {
callback->OnClosed(it->second->mount_id());
@ -385,5 +387,13 @@ void FuseBridgeLoop::Start(FuseBridgeLoopCallback* callback) {
}
}
void FuseBridgeLoop::Lock() {
mutex_.lock();
}
void FuseBridgeLoop::Unlock() {
mutex_.unlock();
}
} // namespace fuse
} // namespace android

6
libappfuse/include/libappfuse/FuseBridgeLoop.h
View file

@ -50,6 +50,10 @@ class FuseBridgeLoop final {
// thread from one which invokes |Start|.
bool AddBridge(int mount_id, base::unique_fd dev_fd, base::unique_fd proxy_fd);
static void Lock();
static void Unlock();
private:
bool ProcessEventLocked(const std::unordered_set<FuseBridgeEntry*>& entries,
FuseBridgeLoopCallback* callback);
@ -60,7 +64,7 @@ class FuseBridgeLoop final {
std::map<int, std::unique_ptr<FuseBridgeEntry>> bridges_;
// Lock for multi-threading.
std::mutex mutex_;
static std::recursive_mutex mutex_;
bool opened_;