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

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Message-Id: <1154023836.7190.3.camel@ubuntu>
Date:	Thu, 27 Jul 2006 21:10:36 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Petr Baudis <pasky@...e.cz>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	akpm@...l.org, viro@...iv.linux.org.uk, alan@...rguk.ukuu.org.uk,
	tytso@....edu, tigran@...itas.com
Subject: Re: [RFC/PATCH] revoke/frevoke system calls V2

On Thu, 2006-07-27 at 20:06 +0200, Petr Baudis wrote:
> Make that setuid root or just create log file owned by you and make root
> run it.  Should be innocent enough, right?
> 
> Well, except that you can revoke the log file before the shadow file is
> opened, at which point open() probably reuses the fd and the program
> conveniently logs to /etc/shadow.

No, the fd is leaked on purpose to avoid recycling. See revoke_fds for
details.

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