linux-kernel - Re: TOMOYO Linux Security Goal

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Message-ID: <20071230000217.GA17828@ucw.cz>
Date:	Sun, 30 Dec 2007 00:02:17 +0000
From:	Pavel Machek <pavel@....cz>
To:	Valdis.Kletnieks@...edu
Cc:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	serue@...ibm.com, linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: TOMOYO Linux Security Goal

On Fri 2007-12-28 12:23:51, Valdis.Kletnieks@...edu wrote:
> On Fri, 28 Dec 2007 23:32:09 +0900, Tetsuo Handa said:
> 
> > You can run your system with only policy collected by learning mode.
> > Thus, you basically don't need manual intervention.
> > But since there are randomly named files (i.e. temporary files),
> > you pay a little time to modify policy.
> > 
> > The learning mode is to save time for permitting commonly accessed resources.
> > Administrator reviews policy collected by learning mode. Thus the readability
> > of policy is important so that administrator can understand what he/she is
> > going to allow or reject.
> 
> Please make a *big* notation someplace that "learning mode" is quite likely to
> *not* produce a totally correct policy.  In particular, it won't build rules for
> infrequently used code paths (such as error handling) unless you find a way to
> exercise those paths while in learning mode.
> 
> Particularly fun - when learning mode doesn't create an entry for the logfile
> for I/O errors.  Then when one actually happens, you have no idea what it was...

Yes... if you disallow access to /etc/nologin (or do something
similary stupid) you can even introduce security hole...
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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