[PATCH 2/3] Revert "fix minor infoleak in get_user_ex()"

Tim Gardner tim.gardner at canonical.com
Tue Nov 1 12:25:15 UTC 2016


From: Greg Kroah-Hartman <gregkh at linuxfoundation.org>

BugLink: http://bugs.launchpad.net/bugs/1638272

This reverts commit 9d25c78ec01c402dc56272693c44ef9d72ecdd2e which is
1c109fabbd51863475cd12ac206bdd249aee35af upstream

Cc: Al Viro <viro at zeniv.linux.org.uk>
Cc: Linus Torvalds <torvalds at linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
Signed-off-by: Tim Gardner <tim.gardner at canonical.com>
---
 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 d42252c..09b1b0a 100644
--- a/arch/x86/include/asm/uaccess.h
+++ b/arch/x86/include/asm/uaccess.h
@@ -394,11 +394,7 @@ 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)			\
-- 
2.7.4





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