lkml.org 
[lkml]   [2017]   [Aug]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH urgent] x86/asm/64: Clear AC on NMI entries
Date
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
\
 
 \ /
  Last update: 2017-08-08 04:44    [W:0.051 / U:4.756 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site