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

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Message-ID: <20091030183126.GE7008@elf.ucw.cz>
Date: Fri, 30 Oct 2009 19:31:26 +0100
From: Pavel Machek <pavel@....cz>
To: Marco Verschuur <marco@....nl>
Cc: Jim Paris <jim@...n.com>, Dan Yefimov <dan@...htwave.net.ru>,
	bugtraq@...urityfocus.com
Subject: Re: /proc filesystem allows bypassing directory permissions on
 Linux

Hi!

(no html, please).

>    Proc does not need to be fixed, because /proc is referring to a file
>    inode.

Well, that does not mean /proc does not need fixing.

>    You are expecting transactional behavior in /proc, where /proc only
>    registers object information.
...
>    And I think you would agree about your mis-interpretation earlier
>    if not so
>    many people had the same mis-interpretation of the virtual /proc
>    mechanism

I think you understand the issue by now. But you think it should be
documented better, not fixed. I believe that fixing it is easier and
better option -- because surprises in security area are bad -- but of
course, if this is documented properly, it also stops being so big
problem.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html