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    SubjectRe: [tip:perf/core] x86, 64-bit: Fix copy_[to/from]_user() checks for the userspace address limit
    On Wed, May 18, 2011 at 1:43 PM, tip-bot for Jiri Olsa <jolsa@redhat.com> wrote:
    > As reported in BZ #30352:
    >
    >  https://bugzilla.kernel.org/show_bug.cgi?id=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".

    It is not about pages at all. It's about bytes. It's the very last
    byte of the address space. The fact that the *test*program* uses mmap
    and then sends a single page is totally irrelevant both for the kernel
    and for the patch itself.

    Linus
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