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SubjectRe: [RFC/PATCH] revoke/frevoke system calls V2
On Mon, 7 Aug 2006, Edgar Toernig wrote:

>
> Your implementation is much cruder - it simply takes the fd
> away from the app; any future use gives EBADF. As a bonus,
> it works for regular files and even goes as far as destroying
> all mappings of the file from all processes (even root processes).
> IMVHO this is a disaster from a security and reliability point
> of view.
>

I can see the value in these system calls, but I agree that the
implementation is crude. "EBADF" is not something that applications are
taught to expect. Someone correct me if I'm wrong, but I can think of no
situation under which a file descriptor currently gets yanked out from
under your feet -- you should always have to formally abandon it with
close().

This kind of thing only looks proper if it leaves the file descriptor in
place and just returns errors / EOF when you attempt to access it.

Thanks,
Chase
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