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    SubjectRe: mmap bug?
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       It seems that attempts to mmap a region of size zero causes
    mmap to return zero. Is this a bug?

    Since it doesn't return -1, it looks like success, but of
    course dereferencing this NULL pointer causes a crash.

    Why would you dereference it if you didn't specify any memory? It
    seems to me that this is valid kernel behavior, and that the program
    has the bug.

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