linux-kernel - [PATCH 3.12 69/72] Revert "fix minor infoleak in get_user

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Date:   Mon,  7 Nov 2016 14:30:49 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Jiri Slaby <jslaby@...e.cz>,
        Al Viro <viro@...iv.linux.org.uk>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 3.12 69/72] Revert "fix minor infoleak in get_user_ex()"

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

===============

This reverts commit d42924ab1ec523c0671f5560d51750996be31d3a which is
1c109fabbd51863475cd12ac206bdd249aee35af upstream.

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
---
 arch/x86/include/asm/uaccess.h | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h
index 01635e4e187a..5838fa911aa0 100644
--- a/arch/x86/include/asm/uaccess.h
+++ b/arch/x86/include/asm/uaccess.h
@@ -383,11 +383,7 @@ do {									\
 #define __get_user_asm_ex(x, addr, itype, rtype, ltype)			\
 	asm volatile("1:	mov"itype" %1,%"rtype"0\n"		\
 		     "2:\n"						\
-		     ".section .fixup,\"ax\"\n"				\
-                     "3:xor"itype" %"rtype"0,%"rtype"0\n"		\
-		     "  jmp 2b\n"					\
-		     ".previous\n"					\
-		     _ASM_EXTABLE_EX(1b, 3b)				\
+		     _ASM_EXTABLE_EX(1b, 2b)				\
 		     : ltype(x) : "m" (__m(addr)))
 
 #define __put_user_nocheck(x, ptr, size)			\
-- 
2.10.2