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

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Date:	Wed, 27 Apr 2016 04:56:11 +0300
From:	"Dmitry V. Levin" <ldv@...linux.org>
To:	"James E.J. Bottomley" <jejb@...isc-linux.org>,
	Helge Deller <deller@....de>
Cc:	Mike Frysinger <vapier@...too.org>, linux-parisc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] parisc: fix a bug when syscall number of tracee is __NR_Linux_syscalls

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.

Cc: stable@...r.kernel.org
Signed-off-by: Dmitry V. Levin <ldv@...linux.org>
---
 arch/parisc/kernel/syscall.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/parisc/kernel/syscall.S b/arch/parisc/kernel/syscall.S
index c976ebf..57b4836 100644
--- a/arch/parisc/kernel/syscall.S
+++ b/arch/parisc/kernel/syscall.S
@@ -344,7 +344,7 @@ tracesys_next:
 #endif
 
 	cmpib,COND(=),n -1,%r20,tracesys_exit /* seccomp may have returned -1 */
-	comiclr,>>=	__NR_Linux_syscalls, %r20, %r0
+	comiclr,>>	__NR_Linux_syscalls, %r20, %r0
 	b,n	.Ltracesys_nosys
 
 	LDREGX  %r20(%r19), %r19
-- 
ldv