linux-kernel - [PATCH v2 5/6] signal: sys_sigprocmask() needs retarget_shared

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Message-ID: <20110426195002.GF8520@redhat.com>
Date:	Tue, 26 Apr 2011 21:50:02 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	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 5/6] signal: sys_sigprocmask() needs
	retarget_shared_pending()

sys_sigprocmask() changes current->blocked by hand. Convert this code to
use sigprocmask() which implies the necessary retarget_shared_pending().

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

 kernel/signal.c |   24 ++++++------------------
 1 file changed, 6 insertions(+), 18 deletions(-)

--- sigprocmask/kernel/signal.c~5_old_sigprocmask_retarget	2011-04-26 19:54:09.000000000 +0200
+++ sigprocmask/kernel/signal.c	2011-04-26 19:54:20.000000000 +0200
@@ -2702,6 +2702,7 @@ SYSCALL_DEFINE3(sigprocmask, int, how, o
 		old_sigset_t __user *, oset)
 {
 	old_sigset_t old_set, new_set;
+	sigset_t new_full_set;
 	int error;
 
 	old_set = current->blocked.sig[0];
@@ -2711,25 +2712,12 @@ SYSCALL_DEFINE3(sigprocmask, int, how, o
 			return -EFAULT;
 		new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP));
 
-		error = 0;
-		spin_lock_irq(&current->sighand->siglock);
-		switch (how) {
-		default:
-			error = -EINVAL;
-			break;
-		case SIG_BLOCK:
-			sigaddsetmask(&current->blocked, new_set);
-			break;
-		case SIG_UNBLOCK:
-			sigdelsetmask(&current->blocked, new_set);
-			break;
-		case SIG_SETMASK:
-			current->blocked.sig[0] = new_set;
-			break;
-		}
+		sigemptyset(&new_full_set);
+		if (how == SIG_SETMASK)
+			new_full_set = current->blocked;
+		new_full_set.sig[0] = new_set;
 
-		recalc_sigpending();
-		spin_unlock_irq(&current->sighand->siglock);
+		error = sigprocmask(how, &new_full_set, NULL);
 		if (error)
 			return error;
 	}

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