linux-kernel - [PATCH 3.19.y-ckt 47/54] parisc: fix a bug when syscall number of tracee is __NR_Linux

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Date:	Mon,  9 May 2016 17:05:06 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	"Dmitry V . Levin" <ldv@...linux.org>,
	Helge Deller <deller@....de>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 47/54] parisc: fix a bug when syscall number of tracee is __NR_Linux_syscalls

3.19.8-ckt21 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

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: Kamal Mostafa <kamal@...onical.com>
---
 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 0b8d26d..7105610 100644
--- a/arch/parisc/kernel/syscall.S
+++ b/arch/parisc/kernel/syscall.S
@@ -342,7 +342,7 @@ tracesys_next:
 	stw     %r21, -56(%r30)                 /* 6th argument */
 #endif
 
-	comiclr,>>=	__NR_Linux_syscalls, %r20, %r0
+	comiclr,>>	__NR_Linux_syscalls, %r20, %r0
 	b,n	.Lsyscall_nosys
 
 	LDREGX  %r20(%r19), %r19
-- 
2.7.4