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    SubjectRe: [PATCH] Gerd Hoffman's move-vsyscall-into-user-address-range patch

    * Rusty Russell <rusty@rustcorp.com.au> wrote:

    > Thanks, I looked at the exec-shield patch. It has some rough
    > edges (at least the 2.6.16 version I found).

    the most recent one is always in the Fedora rawhide kernel RPM/SRPM.
    (that means it closely tracks upstream.)

    > Gerd's is basically a minimal subset of the exec-shield: we
    > can go further towards exec-shield by using get_unmapped_area for the
    > vsyscall page rather than nailing it above the stack, but it takes us
    > from a 280-line patch to a 480-line patch.

    certainly looks good to me! What are the changes you did to the
    exec-shield implementation of vdso randomization? The patch seems
    largely identical to the one in exec-shield.

    (and it would be nice to do this on x86_64 too - exploits already exist
    using the fixmapped VDSO there as a trampoline.)

    Signed-off-by: Ingo Molnar <mingo@elte.hu>

    Ingo
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