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    SubjectRe: [PATCH v2 3/4] x86, head_32/64.S: Enable SMEP
    On Mon, May 16, 2011 at 02:34:44PM -0700, Fenghua Yu wrote:
    > From: Fenghua Yu <>
    > Enable newly documented SMEP (Supervisor Mode Execution Protection) CPU
    > feature in kernel.
    > SMEP prevents the CPU in kernel-mode to jump to an executable page that does
    > not have the kernel/system 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. The violation will cause page fault #PF and will have error code
    > identical to XD violation.

    Are EFI runtime service pages currently set up appropriately?

    Matthew Garrett |

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