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    SubjectRe: [RFC PATCH v4 24/27] mm/mmap: Create a guard area between VMAs
    On Tue, Oct 2, 2018 at 9:55 PM Eugene Syromiatnikov <esyr@redhat.com> wrote:
    >
    > On Fri, Sep 21, 2018 at 08:03:48AM -0700, Yu-cheng Yu wrote:
    > > Create a guard area between VMAs, to detect memory corruption.
    >
    > Do I understand correctly that with this patch a user space program
    > no longer be able to place two mappings back to back? If it is so,
    > it will likely break a lot of things; for example, it's a common ring
    > buffer implementations technique, to map buffer memory twice back
    > to back in order to avoid special handling of items wrapping its end.

    I haven't checked what the patch actually does, but it shouldn't have
    any affect on MAP_FIXED or the new no-replace MAP_FIXED variant.

    --Andy

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