[PATCH] do_sigaction: cleanup ->sa_mask manipulation

Clear unblockable signals beforehand.

Signed-off-by: Oleg Nesterov <[email protected]>

--- RC-1/include/linux/sched.h~SAKILL	2006-02-07 01:40:51.000000000 +0300
+++ RC-1/include/linux/sched.h	2006-02-10 00:15:19.000000000 +0300
@@ -1097,7 +1097,7 @@ extern struct sigqueue *sigqueue_alloc(v
 extern void sigqueue_free(struct sigqueue *);
 extern int send_sigqueue(int, struct sigqueue *,  struct task_struct *);
 extern int send_group_sigqueue(int, struct sigqueue *,  struct task_struct *);
-extern int do_sigaction(int, const struct k_sigaction *, struct k_sigaction *);
+extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
 
 /* These can be the second arg to send_sig_info/send_group_sig_info.  */
--- RC-1/kernel/signal.c~SAKILL	2006-02-09 23:17:54.000000000 +0300
+++ RC-1/kernel/signal.c	2006-02-10 00:17:43.000000000 +0300
@@ -2430,7 +2430,7 @@ sys_rt_sigqueueinfo(int pid, int sig, si
 }
 
 int
-do_sigaction(int sig, const struct k_sigaction *act, struct k_sigaction *oact)
+do_sigaction(int sig, struct k_sigaction *act, struct k_sigaction *oact)
 {
 	struct k_sigaction *k;
 	sigset_t mask;
@@ -2454,6 +2454,8 @@ do_sigaction(int sig, const struct k_sig
 		*oact = *k;
 
 	if (act) {
+		sigdelsetmask(&act->sa.sa_mask,
+			      sigmask(SIGKILL) | sigmask(SIGSTOP));
 		/*
 		 * POSIX 3.3.1.3:
 		 *  "Setting a signal action to SIG_IGN for a signal that is
@@ -2479,8 +2481,6 @@ do_sigaction(int sig, const struct k_sig
 			read_lock(&tasklist_lock);
 			spin_lock_irq(&t->sighand->siglock);
 			*k = *act;
-			sigdelsetmask(&k->sa.sa_mask,
-				      sigmask(SIGKILL) | sigmask(SIGSTOP));
 			sigemptyset(&mask);
 			sigaddset(&mask, sig);
 			rm_from_queue_full(&mask, &t->signal->shared_pending);
@@ -2495,8 +2495,6 @@ do_sigaction(int sig, const struct k_sig
 		}
 
 		*k = *act;
-		sigdelsetmask(&k->sa.sa_mask,
-			      sigmask(SIGKILL) | sigmask(SIGSTOP));
 	}
 
 	spin_unlock_irq(&current->sighand->siglock);
-
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---

• References:
  • [PATCH] fix copy_sighand() vs do_sigaction() race
    • From: Oleg Nesterov <[email protected]>

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