Re: [PATCH] new setprocuid syscall

[Alan Cox <alan _at_ lxorguk.ukuu.org.uk>]

> Fair enough but could you explain the potential problems?  And how is
> it different from sys_setpriority?

Suppose you change a tasks uid in parallel with the set of conditionals
in setuid - just as one example. Or you change uid _during_ a quota operation.
Or during sys5 ipc ops.

All of these and more make assumptions. The idea of locking uid changes with
semaphores would produce some truely horrible performance impacts

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