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fix minor infoleak in get_user_ex()

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commit 1c109fabbd upstream.

get_user_ex(x, ptr) should zero x on failure.  It's not a lot of a leak
(at most we are leaking uninitialized 64bit value off the kernel stack,
and in a fairly constrained situation, at that), but the fix is trivial,
so...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
[ This sat in different branch from the uaccess fixes since mid-August ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Al Viro
2016-09-15 02:35:29 +01:00
committed by Greg Kroah-Hartman
parent a14f64ca40
commit 9d25c78ec0
1 changed files with 5 additions and 1 deletions
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6
arch/x86/include/asm/uaccess.h
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@@ -394,7 +394,11 @@ do { \
#define __get_user_asm_ex(x, addr, itype, rtype, ltype) \ #define __get_user_asm_ex(x, addr, itype, rtype, ltype) \
asm volatile("1: mov"itype" %1,%"rtype"0\n" \ asm volatile("1: mov"itype" %1,%"rtype"0\n" \
"2:\n" \ "2:\n" \
_ASM_EXTABLE_EX(1b, 2b) \ ".section .fixup,\"ax\"\n" \
"3:xor"itype" %"rtype"0,%"rtype"0\n" \
" jmp 2b\n" \
".previous\n" \
_ASM_EXTABLE_EX(1b, 3b) \
: ltype(x) : "m" (__m(addr))) : ltype(x) : "m" (__m(addr)))
#define __put_user_nocheck(x, ptr, size) \ #define __put_user_nocheck(x, ptr, size) \