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Subject[PATCH] posix-timers: Prevent broadcast signals
Date
From: Thomas Gleixner <tglx@linutronix.de>

Posix timers should not send broadcast signals and kernel only
signals. Prevent it.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
kernel/time/posix-timers.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index b6899b5060bd..4c4cbebb0d71 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -435,6 +435,7 @@ static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer)
static struct pid *good_sigevent(sigevent_t * event)
{
struct task_struct *rtn = current->group_leader;
+ int sig = event->sigev_signo;

switch (event->sigev_notify) {
case SIGEV_SIGNAL | SIGEV_THREAD_ID:
@@ -444,7 +445,8 @@ static struct pid *good_sigevent(sigevent_t * event)
/* FALLTHRU */
case SIGEV_SIGNAL:
case SIGEV_THREAD:
- if (event->sigev_signo <= 0 || event->sigev_signo > SIGRTMAX)
+ if (sig <= 0 || sig > SIGRTMAX ||
+ sig_kernel_only(sig) || sig_kernel_coredump(sig))
return NULL;
/* FALLTHRU */
case SIGEV_NONE:
--
2.17.0
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