Messages in this thread Patch in this message | | | From | Andy Lutomirski <> | Subject | [PATCH urgent] x86/asm/64: Clear AC on NMI entries | Date | Mon, 7 Aug 2017 19:43:13 -0700 |
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This closes a hole in our SMAP implementation.
This patch comes from grsecurity. Good catch!
Cc: stable@vger.kernel.org Signed-off-by: Andy Lutomirski <luto@kernel.org> --- arch/x86/entry/entry_64.S | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index d271fb79248f..6d078b89a5e8 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -1211,6 +1211,8 @@ ENTRY(nmi) * other IST entries. */ + ASM_CLAC + /* Use %rdx as our temp variable throughout */ pushq %rdx -- 2.13.3
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