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

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Date:	Tue, 8 Aug 2006 15:57:20 +0200
From:	Pavel Machek <pavel@....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!

> > > 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?
> 
> I make a symlink before running the app which opens it. Or if the app
> doesn't open it I pass the file handle of a pty/tty pair to it.

Okay, I guess marginal app could do open, then fstat to make sure it
is not pty/tty, then proceed assuming it can't go away. But I see that
chances of _that_ happening are slim.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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