rt-patches/0012-posix-timers-Prevent-broadcast-signals.patch

   1 From 59b8ba4d0d9d85285d5ccd518e7f678ee8f15d79 Mon Sep 17 00:00:00 2001
   2 From: Thomas Gleixner <tglx@linutronix.de>
   3 Date: Fri, 3 Jul 2009 08:29:20 -0500
   4 Subject: [PATCH 012/366] posix-timers: Prevent broadcast signals
   5
   6 Posix timers should not send broadcast signals and kernel only
   7 signals. Prevent it.
   8
   9 Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
  10 ---
  11  kernel/time/posix-timers.c | 4 +++-
  12  1 file changed, 3 insertions(+), 1 deletion(-)
  13
  14 diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
  15 index f2826c3..81aec84 100644
  16 --- a/kernel/time/posix-timers.c
  17 +++ b/kernel/time/posix-timers.c
  18 @@ -506,6 +506,7 @@ static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer)
  19  static struct pid *good_sigevent(sigevent_t * event)
  20  {
  21         struct task_struct *rtn = current->group_leader;
  22 +       int sig = event->sigev_signo;
  23
  24         if ((event->sigev_notify & SIGEV_THREAD_ID ) &&
  25                 (!(rtn = find_task_by_vpid(event->sigev_notify_thread_id)) ||
  26 @@ -514,7 +515,8 @@ static struct pid *good_sigevent(sigevent_t * event)
  27                 return NULL;
  28
  29         if (((event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) &&
  30 -           ((event->sigev_signo <= 0) || (event->sigev_signo > SIGRTMAX)))
  31 +           (sig <= 0 || sig > SIGRTMAX || sig_kernel_only(sig) ||
  32 +            sig_kernel_coredump(sig)))
  33                 return NULL;
  34
  35         return task_pid(rtn);
  36 --
  37 1.9.1
  38