[ARM] Fix ARM signal handling.

If we are unable to deliver a signal to the process (eg, due to stack
pointer corruption) block the signal so other fatal signals can kill
off the process.

diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
index 9901b5d010a079d9eaa6ad8fd0d8febb2006b8c1..139603ee611f11481e703f01365d5d6a4a2a2aea 100644 (file)
--- a/arch/arm/kernel/signal.c
+++ b/arch/arm/kernel/signal.c
@@ -497,18 +497,21 @@ handle_signal(unsigned long sig, siginfo_t *info, sigset_t *oldset,
         */
        ret |= !valid_user_regs(regs);
 
+       /*
+        * Block the signal if we were unsuccessful.
+        */
+       if (ret != 0 || !(ka->sa.sa_flags & SA_NODEFER)) {
+               spin_lock_irq(&tsk->sighand->siglock);
+               sigorsets(&tsk->blocked, &tsk->blocked,
+                         &ka->sa.sa_mask);
+               sigaddset(&tsk->blocked, sig);
+               recalc_sigpending();
+               spin_unlock_irq(&tsk->sighand->siglock);
+       }
+
        if (ret == 0) {
                if (ka->sa.sa_flags & SA_ONESHOT)
                        ka->sa.sa_handler = SIG_DFL;
-
-               if (!(ka->sa.sa_flags & SA_NODEFER)) {
-                       spin_lock_irq(&tsk->sighand->siglock);
-                       sigorsets(&tsk->blocked, &tsk->blocked,
-                                 &ka->sa.sa_mask);
-                       sigaddset(&tsk->blocked, sig);
-                       recalc_sigpending();
-                       spin_unlock_irq(&tsk->sighand->siglock);
-               }
                return;
        }