signal: sys_pause() should check signal_pending()
ERESTART* is always wrong without TIF_SIGPENDING. Teach sys_pause()
to handle the spurious wakeup correctly.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
diff --git a/kernel/signal.c b/kernel/signal.c
index ad5e818..86c32b8 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -3023,8 +3023,10 @@
SYSCALL_DEFINE0(pause)
{
- current->state = TASK_INTERRUPTIBLE;
- schedule();
+ while (!signal_pending(current)) {
+ current->state = TASK_INTERRUPTIBLE;
+ schedule();
+ }
return -ERESTARTNOHAND;
}