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>

diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 82fcc1e64e82b586215e53bed26a5e3e3a7c2ee4..de4b67f09ddba7a3c5e5e888b618db680edfcd90 100644 (file)
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -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)