Commit 64340986 authored by Andy Lutomirski's avatar Andy Lutomirski Committed by Greg Kroah-Hartman

x86/asm/64: Clear AC on NMI entries

commit e93c1730 upstream.

This closes a hole in our SMAP implementation.

This patch comes from grsecurity. Good catch!
Signed-off-by: default avatarAndy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/314cc9f294e8f14ed85485727556ad4f15bb1659.1502159503.git.luto@kernel.orgSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c0b397fd
...@@ -1190,6 +1190,8 @@ ENTRY(nmi) ...@@ -1190,6 +1190,8 @@ ENTRY(nmi)
* other IST entries. * other IST entries.
*/ */
ASM_CLAC
/* Use %rdx as our temp variable throughout */ /* Use %rdx as our temp variable throughout */
pushq %rdx pushq %rdx
......
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