linux-kernel - [PATCH 4.5 62/88] parisc: fix a bug when syscall number of tracee is __NR_Linux

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Date:	Mon,  9 May 2016 09:21:51 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, "Dmitry V. Levin" <ldv@...linux.org>,
	Helge Deller <deller@....de>
Subject: [PATCH 4.5 62/88] parisc: fix a bug when syscall number of tracee is __NR_Linux_syscalls

4.5-stable 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>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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
@@ -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