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

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Date:	Wed, 09 Aug 2006 19:35:48 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Edgar Toernig <froese@....de>
Cc:	Pekka Enberg <penberg@...helsinki.fi>, Pavel Machek <pavel@....cz>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	akpm@...l.org, viro@...iv.linux.org.uk, tytso@....edu,
	tigran@...itas.com
Subject: Re: [RFC/PATCH] revoke/frevoke system calls V2

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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