linux-kernel - [PATCH 3.2 41/46] parisc: fix a bug when syscall number of tracee is __NR_Linux

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Date:	Sun, 12 Jun 2016 22:34:42 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Helge Deller" <deller@....de>,
	"Dmitry V. Levin" <ldv@...linux.org>
Subject: [PATCH 3.2 41/46] parisc: fix a bug when syscall number of tracee
 is __NR_Linux_syscalls

3.2.81-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: "Dmitry V. Levin" <ldv@...linux.org>

commit f0b22d1bb2a37a665a969e95785c75a4f49d1499 upstream.

Do not load one entry beyond the end of the syscall table when the
syscall number of a traced process equals to __NR_Linux_syscalls.
Similar bug with regular processes was fixed by commit 3bb457af4fa8
("[PARISC] Fix bug when syscall nr is __NR_Linux_syscalls").

This bug was found by strace test suite.

Signed-off-by: Dmitry V. Levin <ldv@...linux.org>
Acked-by: Helge Deller <deller@....de>
Signed-off-by: Helge Deller <deller@....de>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/parisc/kernel/syscall.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/parisc/kernel/syscall.S
+++ b/arch/parisc/kernel/syscall.S
@@ -314,7 +314,7 @@ tracesys_next:
 	ldo	-16(%r30),%r29			/* Reference param save area */
 #endif
 
-	comiclr,>>=	__NR_Linux_syscalls, %r20, %r0
+	comiclr,>>	__NR_Linux_syscalls, %r20, %r0
 	b,n	.Lsyscall_nosys
 
 	LDREGX  %r20(%r19), %r19