| From | Ben Hutchings <> | Date | Mon, 06 Nov 2017 23:03:02 +0000 | Subject | [PATCH 3.16 106/294] x86/asm/64: Clear AC on NMI entries |
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3.16.50-rc1 review patch. If anyone has any objections, please let me know.
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From: Andy Lutomirski <luto@kernel.org>
commit e93c17301ac55321fc18e0f8316e924e58a83c8c upstream.
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> Link: http://lkml.kernel.org/r/314cc9f294e8f14ed85485727556ad4f15bb1659.1502159503.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org> [bwh: Backported to 3.16: adjust filename, context] Signed-off-by: Ben Hutchings <ben@decadent.org.uk> --- arch/x86/kernel/entry_64.S | 2 ++ 1 file changed, 2 insertions(+)
--- a/arch/x86/kernel/entry_64.S +++ b/arch/x86/kernel/entry_64.S @@ -1476,6 +1476,8 @@ ENTRY(nmi) * other IST entries. */ + ASM_CLAC + /* Use %rdx as out temp variable throughout */ pushq_cfi %rdx CFI_REL_OFFSET rdx, 0
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