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Re: /proc filesystem allows bypassing directory permissions on

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On Wed
From: Pavel Machek <pavel ucw cz>
To: psz maths usyd edu au, mrex sap com, bugtraq securityfocus com, dan lightwave net ru, jim jtan com, marco osp nl
Cc:
Subject: Re: /proc filesystem allows bypassing directory permissions on
Date: Wed - Nov 04, 2009 12:22 AM


On Wed 2009-11-04 09:06:25, Gabor Gombas wrote:
> On Wed, Nov 04, 2009 at 10:17:13AM +1100, psz@maths.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.

Heck, root can create hardlink and then manually drop link count back
to 1 -- for example using debugfs.
                                                                        Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html




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