Merge master.kernel.org:/pub/scm/linux/kernel/git/kyle/parisc-2.6

[linux-drm-fsl-dcu.git] / kernel / signal.c

diff --git a/kernel/signal.c b/kernel/signal.c
index 8072e568bbe0c41e68cffc8efa291488b4dcf0e7..3670225ecbc01eb5cd6898677ef34f17b4962990 100644 (file)
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -456,26 +456,50 @@ 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);
-       if (!signr)
+       if (!signr) {
                signr = __dequeue_signal(&tsk->signal->shared_pending,
                                         mask, info);
+               /*
+                * itimer signal ?
+                *
+                * itimers are process shared and we restart periodic
+                * itimers in the signal delivery path to prevent DoS
+                * attacks in the high resolution timer case. This is
+                * compliant with the old way of self restarting
+                * itimers, as the SIGALRM is a legacy signal and only
+                * queued once. Changing the restart behaviour to
+                * restart the timer in the signal dequeue path is
+                * reducing the timer noise on heavy loaded !highres
+                * systems too.
+                */
+               if (unlikely(signr == SIGALRM)) {
+                       struct hrtimer *tmr = &tsk->signal->real_timer;
+
+                       if (!hrtimer_is_queued(tmr) &&
+                           tsk->signal->it_real_incr.tv64 != 0) {
+                               hrtimer_forward(tmr, tmr->base->get_time(),
+                                               tsk->signal->it_real_incr);
+                               hrtimer_restart(tmr);
+                       }
+               }
+       }
        recalc_sigpending_tsk(tsk);
-       if (signr && unlikely(sig_kernel_stop(signr))) {
-               /*
-                * Set a marker that we have dequeued a stop signal.  Our
-                * caller might release the siglock and then the pending
-                * stop signal it is about to process is no longer in the
-                * pending bitmasks, but must still be cleared by a SIGCONT
-                * (and overruled by a SIGKILL).  So those cases clear this
-                * shared flag after we've set it.  Note that this flag may
-                * remain set after the signal we return is ignored or
-                * handled.  That doesn't matter because its only purpose
-                * is to alert stop-signal processing code when another
-                * processor has come along and cleared the flag.
-                */
-               if (!(tsk->signal->flags & SIGNAL_GROUP_EXIT))
-                       tsk->signal->flags |= SIGNAL_STOP_DEQUEUED;
-       }
+       if (signr && unlikely(sig_kernel_stop(signr))) {
+               /*
+                * Set a marker that we have dequeued a stop signal.  Our
+                * caller might release the siglock and then the pending
+                * stop signal it is about to process is no longer in the
+                * pending bitmasks, but must still be cleared by a SIGCONT
+                * (and overruled by a SIGKILL).  So those cases clear this
+                * shared flag after we've set it.  Note that this flag may
+                * remain set after the signal we return is ignored or
+                * handled.  That doesn't matter because its only purpose
+                * is to alert stop-signal processing code when another
+                * processor has come along and cleared the flag.
+                */
+               if (!(tsk->signal->flags & SIGNAL_GROUP_EXIT))
+                       tsk->signal->flags |= SIGNAL_STOP_DEQUEUED;
+       }
        if ( signr &&
             ((info->si_code & __SI_MASK) == __SI_TIMER) &&
             info->si_sys_private){
@@ -1116,7 +1140,8 @@ int kill_pid_info(int sig, struct siginfo *info, struct pid *pid)
        return error;
 }
 
-static int kill_proc_info(int sig, struct siginfo *info, pid_t pid)
+int
+kill_proc_info(int sig, struct siginfo *info, pid_t pid)
 {
        int error;
        rcu_read_lock();