binder: signal epoll threads of self-work

commit 97830f3c3088638ff90b20dfba2eb4d487bf14d7 upstream.

In (e)poll mode, threads often depend on I/O events to determine when
data is ready for consumption. Within binder, a thread may initiate a
command via BINDER_WRITE_READ without a read buffer and then make use
of epoll_wait() or similar to consume any responses afterwards.

It is then crucial that epoll threads are signaled via wakeup when they
queue their own work. Otherwise, they risk waiting indefinitely for an
event leaving their work unhandled. What is worse, subsequent commands
won't trigger a wakeup either as the thread has pending work.

Fixes: 457b9a6f09f0 ("Staging: android: add binder driver")
Cc: Arve Hjønnevåg <arve@android.com>
Cc: Martijn Coenen <maco@android.com>
Cc: Alice Ryhl <aliceryhl@google.com>
Cc: Steven Moreland <smoreland@google.com>
Cc: stable@vger.kernel.org # v4.19+
Signed-off-by: Carlos Llamas <cmllamas@google.com>
Link: https://lore.kernel.org/r/20240131215347.1808751-1-cmllamas@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index b4b73093757f82ab3e4687eecf279ce94607d537..7547c4ed265c6f13a867e1ab8d3eb9bf9c157e17 100644 (file)
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -450,6 +450,16 @@ binder_enqueue_thread_work_ilocked(struct binder_thread *thread,
 {
        WARN_ON(!list_empty(&thread->waiting_thread_node));
        binder_enqueue_work_ilocked(work, &thread->todo);
+
+       /* (e)poll-based threads require an explicit wakeup signal when
+        * queuing their own work; they rely on these events to consume
+        * messages without I/O block. Without it, threads risk waiting
+        * indefinitely without handling the work.
+        */
+       if (thread->looper & BINDER_LOOPER_STATE_POLL &&
+           thread->pid == current->pid && !thread->process_todo)
+               wake_up_interruptible_sync(&thread->wait);
+
        thread->process_todo = true;
 }