bugtraq - Re: /proc filesystem allows bypassing directory permissions on

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Message-ID: <20091104083110.GA13989@elf.ucw.cz>
Date: Wed, 4 Nov 2009 09:31:10 +0100
From: Pavel Machek <pavel@....cz>
To: psz@...hs.usyd.edu.au, mrex@....com, bugtraq@...urityfocus.com,
	dan@...htwave.net.ru, jim@...n.com, marco@....nl
Subject: Re: /proc filesystem allows bypassing directory permissions on

On Wed 2009-11-04 09:06:25, Gabor Gombas wrote:
> On Wed, Nov 04, 2009 at 10:17:13AM +1100, psz@...hs.usyd.edu.au wrote:
> 
> > But, mount requires root (and root can do anything, including shooting
> > himself in the foot).
> 
> Irrelevant. The statement was that if /proc is not mounted, then the
> link count tells if there are other ways to access the inode besides the
> path you have used to access it. I showed you that this statement is
> false.

You showed almost nothing. If you assume root interference, he can do
anything, including overwriting kernel with another one.

OTOH /proc is mounted by default...
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html