Commits
Fenghua Yu committed d0281a257f3
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>