Merge with /pub/scm/linux/kernel/git/torvalds/linux-2.6.git

1 files changed, 10 insertions, 1 deletions

diff --git a/kernel/signal.c b/kernel/signal.c
index 8f3debc77c5b..b3c24c732c5a 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -522,7 +522,16 @@ static int __dequeue_signal(struct sigpending *pending, sigset_t *mask,
 {
         int sig = 0;
 
-        sig = next_signal(pending, mask);
+        /* SIGKILL must have priority, otherwise it is quite easy
+         * to create an unkillable process, sending sig < SIGKILL
+         * to self */
+        if (unlikely(sigismember(&pending->signal, SIGKILL))) {
+                if (!sigismember(mask, SIGKILL))
+                        sig = SIGKILL;
+        }
+
+        if (likely(!sig))
+                sig = next_signal(pending, mask);
         if (sig) {
                 if (current->notifier) {
                         if (sigismember(current->notifier_mask, sig)) {