x86/asm/64: Clear AC on NMI entries
authorAndy Lutomirski <luto@kernel.org>
Tue, 8 Aug 2017 02:43:13 +0000 (19:43 -0700)
committerIngo Molnar <mingo@kernel.org>
Thu, 10 Aug 2017 11:13:15 +0000 (13:13 +0200)
commite93c17301ac55321fc18e0f8316e924e58a83c8c
tree34dea282e59b05d5e40da598295d46af3602127b
parent8d31f80eb38819e4f2905ad21c0e8998382a08f7
x86/asm/64: Clear AC on NMI entries

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>
arch/x86/entry/entry_64.S