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    SubjectRe: [tip:perf/core] x86, 64-bit: Fix copy_[to/from]_user() checks for the userspace address limit

    * Linus Torvalds <> wrote:

    > On Wed, May 18, 2011 at 1:43 PM, tip-bot for Jiri Olsa <> wrote:
    > > As reported in BZ #30352:
    > >
    > >
    > >
    > > there's a kernel bug related to reading the last allowed page on x86_64.
    > Btw, I think this message is very misleading.
    > It has nothing what-so-ever to do with "the last allowed page".

    Yeah, i noticed that and this is why i added this bit from Brian's explanation
    to the end of the commit:

    The bug is that the last byte before the guard page can't be read
    because of the off-by-one error. The guard page is left in place.

    I should have fixed the original changelog instead of trying to clarify it via
    appending it ...


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