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x86/asm/64: Clear AC on NMI entries
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This closes a hole in our SMAP implementation.

This patch comes from grsecurity. Good catch!

Signed-off-by: Andy 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>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/314cc9f294e8f14ed85485727556ad4f15bb1659.1502159503.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Andy Lutomirski authored and Ingo Molnar committed Aug 10, 2017
1 parent 8d31f80 commit e93c173
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2 changes: 2 additions & 0 deletions arch/x86/entry/entry_64.S
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Original file line number Diff line number Diff line change
Expand Up @@ -1211,6 +1211,8 @@ ENTRY(nmi)
* other IST entries.
*/

ASM_CLAC

/* Use %rdx as our temp variable throughout */
pushq %rdx

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