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Commit 9ac95f2f authored by Oleg Nesterov's avatar Oleg Nesterov Committed by Linus Torvalds
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[PATCH] do_sigaction: cleanup ->sa_mask manipulation 



Clear unblockable signals beforehand.

Signed-off-by: default avatarOleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent c70d3d70

include/linux/sched.h

+1 −1
Original line number Diff line number Diff line
@@ -1098,7 +1098,7 @@ extern struct sigqueue *sigqueue_alloc(void); 
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.  */

kernel/signal.c

+3 −5
Original line number Diff line number Diff line
@@ -2430,7 +2430,7 @@ sys_rt_sigqueueinfo(int pid, int sig, siginfo_t __user *uinfo) 
}



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_sigaction *act, struct k_sigaction *oact) 
		*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_sigaction *act, struct k_sigaction *oact) 
			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_sigaction *act, struct k_sigaction *oact) 
		}



		*k = *act;

		sigdelsetmask(&k->sa.sa_mask,

			      sigmask(SIGKILL) | sigmask(SIGSTOP));

	}



	spin_unlock_irq(&current->sighand->siglock);