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authorSasha Levin <sasha.levin@oracle.com>2016-02-05 15:36:05 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-02-05 18:10:40 -0800
commit823dd3224a07f618d652a7743c9603222d019de3 (patch)
tree56e8dd97ecfe996c6337c17e8255fa4bf716bcf2
parentdf48ab3c2f5ffca88b7803ffbadd074bd5a0a2ef (diff)
downloadlinux-823dd3224a07f618d652a7743c9603222d019de3.tar.bz2
signals: avoid random wakeups in sigsuspend()
A random wakeup can get us out of sigsuspend() without TIF_SIGPENDING being set. Avoid that by making sure we were signaled, like sys_pause() does. Signed-off-by: Sasha Levin <sasha.levin@oracle.com> Acked-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--kernel/signal.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/kernel/signal.c b/kernel/signal.c
index f3f1f7a972fd..0508544c8ced 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -3508,8 +3508,10 @@ static int sigsuspend(sigset_t *set)
current->saved_sigmask = current->blocked;
set_current_blocked(set);
- __set_current_state(TASK_INTERRUPTIBLE);
- schedule();
+ while (!signal_pending(current)) {
+ __set_current_state(TASK_INTERRUPTIBLE);
+ schedule();
+ }
set_restore_sigmask();
return -ERESTARTNOHAND;
}