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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2007-06-12 08:16:18 +1000
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-06-18 10:18:32 -0700
commitcaec4e8dc85e0644ec24aeb36285e1ba02da58cc (patch)
treec40510afdc1676f268d14ecb8bfe2ab887cf0b0f
parentbd197234b0a616c8f04f6b682326a5a24b33ca92 (diff)
Fix signalfd interaction with thread-private signals
Don't let signalfd dequeue private signals off other threads (in the case of things like SIGILL or SIGSEGV, trying to do so would result in undefined behaviour on who actually gets the signal, since they are force unblocked). Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Davide Libenzi <davidel@xmailserver.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--kernel/signal.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/kernel/signal.c b/kernel/signal.c
index fe590e00db8..f9405609774 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -363,7 +363,13 @@ static int __dequeue_signal(struct sigpending *pending, sigset_t *mask,
*/
int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
{
- int signr = __dequeue_signal(&tsk->pending, mask, info);
+ int signr = 0;
+
+ /* We only dequeue private signals from ourselves, we don't let
+ * signalfd steal them
+ */
+ if (tsk == current)
+ signr = __dequeue_signal(&tsk->pending, mask, info);
if (!signr) {
signr = __dequeue_signal(&tsk->signal->shared_pending,
mask, info);