From: Fenghua Yu <fenghua.yu@intel.com>
Date: Wed, 18 May 2011 01:44:26 +0000 (-0700)
Subject: x86, cpufeature: Add cpufeature flag for SMEP
X-Git-Tag: v3.0-rc1~393^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d0281a257f370b09c410e466571858b4e12869c9;p=pandora-kernel.git

x86, cpufeature: Add cpufeature flag for SMEP

Add support for newly documented SMEP (Supervisor Mode Execution Protection) CPU
feature flag.

SMEP prevents the CPU in kernel-mode to jump to an executable page
that has the user flag set in the PTE.  This prevents the kernel from
executing user-space code accidentally or maliciously, so it for
example prevents kernel exploits from jumping to specially prepared
user-mode shell code.

[ hpa: added better description by Ingo Molnar ]

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
LKML-Reference: <1305683069-25394-2-git-send-email-fenghua.yu@intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
---

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