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    SubjectRe: [PATCH] new setprocuid syscall

    [BERECZ Szabolcs]
    > The conclusion: it's cannot be implemented without slowdown.

    Or: it cannot be implemented 100% safely and correctly without slowdown.

    If you know the use you wish to put this to, and are willing to risk a
    permission check somewhere being confused momentarily by a non-atomic
    update of a 32-bit number (or the non-atomic update between several
    32-bit numbers, which I think is less serious because then you are not
    granting more than the union of the two UIDs) go ahead and patch your

    > So ignore my patch.

    For official kernels, I agree. They need to be as safe and
    deterministic as possible, especially security-wise, and a semaphore on
    every permission check would be ridiculous.

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