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ANDROID: binder: remove waitqueue when thread exits. 

binder_poll() passes the thread->wait waitqueue that
can be slept on for work. When a thread that uses
epoll explicitly exits using BINDER_THREAD_EXIT,
the waitqueue is freed, but it is never removed
from the corresponding epoll data structure. When
the process subsequently exits, the epoll cleanup
code tries to access the waitlist, which results in
a use-after-free.

Prevent this by using POLLFREE when the thread exits.

Signed-off-by: Martijn Coenen <maco@android.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Cc: stable <stable@vger.kernel.org> # 4.14
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Martijn Coenen 2018-01-05 11:27:07 +01:00 committed by Greg Kroah-Hartman
parent 16ae30ea17
commit f5cb779ba1
1 changed files with 12 additions and 0 deletions
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12
drivers/android/binder.c
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@ -4365,6 +4365,18 @@ static int binder_thread_release(struct binder_proc *proc,
if (t)
spin_lock(&t->lock);
}
/*
* If this thread used poll, make sure we remove the waitqueue
* from any epoll data structures holding it with POLLFREE.
* waitqueue_active() is safe to use here because we're holding
* the inner lock.
*/
if ((thread->looper & BINDER_LOOPER_STATE_POLL) &&
waitqueue_active(&thread->wait)) {
wake_up_poll(&thread->wait, POLLHUP | POLLFREE);
}
binder_inner_proc_unlock(thread->proc);
if (send_reply)