linux-kernel - Re: [AppArmor 39/45] AppArmor: Profile loading and manipulation, pathname matching

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Date:	Mon, 25 Jun 2007 17:14:11 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Chris Mason <chris.mason@...cle.com>
Cc:	James Morris <jmorris@...ei.org>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	Lars Marowsky-Bree <lmb@...e.de>,
	Crispin Cowan <crispin@...ell.com>, Greg KH <greg@...ah.com>,
	Andreas Gruenbacher <agruen@...e.de>, jjohansen@...e.de,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [AppArmor 39/45] AppArmor: Profile loading and manipulation, pathname matching

Hi!

> We've been over the "AA is different" discussion in threads about a
> billion times, and at the last kernel summit.  I think Lars and others
> have done a pretty good job of describing the problems they are trying
> to solve, can we please move on to discussing technical issues around
> that?

Actually, I surprised Lars a lot by telling him ln /etc/shadow /tmp/
allows any user to make AA ineffective on large part of systems -- in
internal discussion. (It is not actually a _bug_, but it is certainly
unexpected).

(Does it surprise you, too? I'm pretty sure it would surprise many users).

James summarized it nicely:

# The design of the AppArmor is based on _appearing simple_, but at the
# expense of completeness and thus correctness.

If even Lars can be surprised by AAs behaviour, I do not think we can
say "AA is different". I'm afraid that AA is trap for users. It
appears simple, and mostly does what it is told, but does not do _what
user wants_.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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