linux-kernel - [PATCH 03/40] avr32: Don't mask signals in the error path

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 14 Feb 2012 11:40:36 +0000
From:	Matt Fleming <matt@...sole-pimps.org>
To:	linux-arch@...r.kernel.org
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Matt Fleming <matt.fleming@...el.com>,
	Hans-Christian Egtvedt <egtvedt@...fundet.no>
Subject: [PATCH 03/40] avr32: Don't mask signals in the error path

From: Matt Fleming <matt.fleming@...el.com>

The current handle_signal() implementation is broken - it will mask
signals if we fail to setup the signal stack frame, which isn't the
desired behaviour, we should only be masking signals if we succeed in
setting up the stack frame. It looks like this code was copied from
the old (broken) arm implementation but wasn't updated when the arm
code was fixed in commit a6c61e9dfdd0 ("[ARM] 3168/1: Update ARM
signal delivery and masking").

Cc: Hans-Christian Egtvedt <egtvedt@...fundet.no>
Acked-by: Havard Skinnemoen <hskinnemoen@...il.com>
Acked-by: Oleg Nesterov <oleg@...hat.com>
Signed-off-by: Matt Fleming <matt.fleming@...el.com>
---
 arch/avr32/kernel/signal.c |   25 ++++++++++++-------------
 1 files changed, 12 insertions(+), 13 deletions(-)

diff --git a/arch/avr32/kernel/signal.c b/arch/avr32/kernel/signal.c
index 64f886f..9c075e1 100644
--- a/arch/avr32/kernel/signal.c
+++ b/arch/avr32/kernel/signal.c
@@ -238,22 +238,21 @@ handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
 	 */
 	ret |= !valid_user_regs(regs);
 
+	if (ret != 0) {
+		force_sigsegv(sig, current);
+		return;
+	}
+
 	/*
-	 * Block the signal if we were unsuccessful.
+	 * Block the signal if we were successful.
 	 */
-	if (ret != 0 || !(ka->sa.sa_flags & SA_NODEFER)) {
-		spin_lock_irq(&current->sighand->siglock);
-		sigorsets(&current->blocked, &current->blocked,
-			  &ka->sa.sa_mask);
+	spin_lock_irq(&current->sighand->siglock);
+	sigorsets(&current->blocked, &current->blocked,
+		  &ka->sa.sa_mask);
+	if (!(ka->sa.sa_flags & SA_NODEFER))
 		sigaddset(&current->blocked, sig);
-		recalc_sigpending();
-		spin_unlock_irq(&current->sighand->siglock);
-	}
-
-	if (ret == 0)
-		return;
-
-	force_sigsegv(sig, current);
+	recalc_sigpending();
+	spin_unlock_irq(&current->sighand->siglock);
 }
 
 /*
-- 
1.7.4.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/