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    SubjectRe: [PATCH 2/2] Perform check in iov_iter_fault_in_readable() by check_readable_bytes()
    Andi Kleen wrote:
    > > It would be quite nice if it were safe to call read(), get EFAULT
    > Even with that patch it is not safe, not even for write, because
    > it's racy.

    That's not necessarily a problem for the applications I described,
    because they can be made to only increase access in parallel with
    access; decreasing access can be synchronised over the whole program.

    But I agree with you, as no application should depend on such subtle
    details, which would probably be broken again in a future kernel anyway.

    -- Jamie

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      Last update: 2009-05-15 16:41    [W:0.020 / U:5.592 seconds]
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