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From: Thomas Gleixner <tglx@linutronix.de>
Date: Fri, 3 Jul 2009 08:29:20 -0500
Subject: posix-timers: Prevent broadcast signals
Posix timers should not send broadcast signals and kernel only
signals. Prevent it.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
kernel/time/posix-timers.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -507,6 +507,7 @@ static enum hrtimer_restart posix_timer_
static struct pid *good_sigevent(sigevent_t * event)
{
struct task_struct *rtn = current->group_leader;
+ int sig = event->sigev_signo;
if ((event->sigev_notify & SIGEV_THREAD_ID ) &&
(!(rtn = find_task_by_vpid(event->sigev_notify_thread_id)) ||
@@ -515,7 +516,8 @@ static struct pid *good_sigevent(sigeven
return NULL;
if (((event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) &&
- ((event->sigev_signo <= 0) || (event->sigev_signo > SIGRTMAX)))
+ (sig <= 0 || sig > SIGRTMAX || sig_kernel_only(sig) ||
+ sig_kernel_coredump(sig)))
return NULL;
return task_pid(rtn);
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