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

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Message-ID: <20091029110027.GA1445@ucw.cz>
Date: Thu, 29 Oct 2009 12:00:27 +0100
From: Pavel Machek <pavel@....cz>
To: Anton Ivanov <anton.ivanov@...-begemot.co.uk>
Cc: Dan Yefimov <dan@...htwave.net.ru>,
	Matthew Bergin <matt.bergin@...mail.com>, bugtraq@...urityfocus.com
Subject: Re: /proc filesystem allows bypassing directory permissions on
	Linux

Hi!

> > > Not that I would have expected anything different considering who posted
> > > it in the first place.
> > >
> > Thus Debian kernel team should be blamed for that misbehaviour. Don't worry, 
> > hardlinks behave just the same way, as you describe. Use authentic Linux 
> > kernels, if you dislike that.
> 
> Just tested it on my colo where the provider is using some homebrew
> derived from the upstream Linux kernel. In any case Pavel was most
> likely using Suse and I asked someone to give it a go on one of all
> Ubuntu varieties. So even if it is not present upstream it is in a patch
> which more than one distro has adopted (f.e. ptrace fixes).

Pavel was using pretty much vanilla kernel. (That is, patches in
drivers but nothing more significant.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html