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    SubjectRe: Filling holes in ext2
    Andrew Morton wrote:
    > Adrian Cox wrote:

    >>Can this actually be exploited? I assume the test on __copy_from_user()
    >>is there in case another thread changes memory mappings while
    >>generic_file_write() is running. My attempts to do this haven't yet
    > I'd expect it to occur if you simply pass an unmapped address
    > to write()?

    No, because the first thing generic_file_write does is an access_ok()
    check. It can only happen if the permissions change during the function.
    That's why it's hard to exploit for real.

    Adrian Cox

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