Re: [RFC/PATCH] revoke/frevoke system calls V2

From: Alan Cox
Date: Wed Aug 09 2006 - 14:13:48 EST

Ar Mer, 2006-08-09 am 20:00 +0200, ysgrifennodd Edgar Toernig:
> And killing them is not OK? "fuser -km /dev/cdrom" already covers both
> cases, mounted somewhere and opened for special access.

fuser is quite easy to race, it doesn't handle all sorts of corner cases
like namespaces either. Its a crude blunt instrument that sometimes
works and is very slow.

> Sorry if I sound a little bit anal. IMO, a generic revoke is a pretty
> sharp sword which is given to ordinary users and I have a very uneasy
> feeling. They can dig in the innards of other people's processes - a
> clean headshot by root is something different ...

I can see your concern about arbitary files, but I'm not sure it holds
simply because the tricks already exist via other methods.

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