linux-kernel - [PATCH v2 1/1] signal: sys_sigprocmask() needs retarget_shared

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Date:	Sun, 1 May 2011 22:08:02 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>,
	"Nikita V. Youshchenko" <nyoushchenko@...sta.com>,
	Matt Fleming <matt@...sole-pimps.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/1] signal: sys_sigprocmask() needs
	retarget_shared_pending()

sys_sigprocmask() changes current->blocked by hand. Convert this code
to use set_current_blocked().

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---

 kernel/signal.c |   22 +++++++++-------------
 1 file changed, 9 insertions(+), 13 deletions(-)

--- sigprocmask/kernel/signal.c~14_old_sigprocmask_retarget	2011-04-30 19:07:11.000000000 +0200
+++ sigprocmask/kernel/signal.c	2011-05-01 21:34:51.000000000 +0200
@@ -2900,7 +2900,7 @@ SYSCALL_DEFINE3(sigprocmask, int, how, o
 		old_sigset_t __user *, oset)
 {
 	old_sigset_t old_set, new_set;
-	int error;
+	sigset_t new_blocked;
 
 	old_set = current->blocked.sig[0];
 
@@ -2909,27 +2909,23 @@ SYSCALL_DEFINE3(sigprocmask, int, how, o
 			return -EFAULT;
 		new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP));
 
-		error = 0;
-		spin_lock_irq(&current->sighand->siglock);
+		new_blocked = current->blocked;
+
 		switch (how) {
-		default:
-			error = -EINVAL;
-			break;
 		case SIG_BLOCK:
-			sigaddsetmask(&current->blocked, new_set);
+			sigaddsetmask(&new_blocked, new_set);
 			break;
 		case SIG_UNBLOCK:
-			sigdelsetmask(&current->blocked, new_set);
+			sigdelsetmask(&new_blocked, new_set);
 			break;
 		case SIG_SETMASK:
-			current->blocked.sig[0] = new_set;
+			new_blocked.sig[0] = new_set;
 			break;
+		default:
+			return -EINVAL;
 		}
 
-		recalc_sigpending();
-		spin_unlock_irq(&current->sighand->siglock);
-		if (error)
-			return error;
+		set_current_blocked(&new_blocked);
 	}
 
 	if (oset) {

--
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