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

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Date:	Tue, 8 Aug 2006 12:57:47 +0000
From:	Pavel Machek <pavel@...e.cz>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Edgar Toernig <froese@....de>,
	Pekka Enberg <penberg@...helsinki.fi>,
	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

Hi!

> > 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.
> 
> Actually its no different than if it didn't. The two are identical
> behaviours.
> 
> To use revoke() I must own the file
> If I own the file I can make it a symlink to a pty/tty pair
> I can revoke a pty/tty pair

How can you symlink opened file?

-- 
Thanks for all the (sleeping) penguins.
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