| 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/posix-timers.c | 4 +++- |
| 1 file changed, 3 insertions(+), 1 deletion(-) |
| |
| --- a/kernel/posix-timers.c |
| +++ b/kernel/posix-timers.c |
| @@ -439,6 +439,7 @@ 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)) || |
| @@ -447,7 +448,8 @@ 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); |