linux-kernel - Re: [PATCH] Version 3 (2.6.23-rc8) Smack: Simplified Mandatory Access Control Kernel

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Message-ID: <4707DE96.4090400@tmr.com>
Date:	Sat, 06 Oct 2007 15:14:30 -0400
From:	Bill Davidsen <davidsen@....com>
To:	Kyle Moffett <mrmacman_g4@....com>
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	James Morris <jmorris@...ei.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	casey@...aufler-ca.com, linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org, "Serge E. Hallyn" <serge@...lyn.com>
Subject: Re: [PATCH] Version 3 (2.6.23-rc8) Smack: Simplified Mandatory Access
 Control Kernel

Kyle Moffett wrote:
> On Oct 04, 2007, at 21:44:02, Eric W. Biederman wrote:
>> What we want from the LSM is the ability to say -EPERM when we can 
>> clearly articulate that we want to disallow something.
> 
> This sort of depends on perspective; typically with security 
> infrastructure you actually want "... the ability to return success when 
> we can clearly articulate that we want to *ALLOW* something".  File 
> permissions work this way; we don't have a list of forbidden users 
> attached to each file, we have an owner, a group, and a mode 
> representing positive permissions.  With that said in certain high-risk 
> environments you need something even stronger that cannot be changed by 
> the "owner" of the file, if we don't entirely trust them,
> 
Other than ACLs, of course, which do allow blacklisting individual users.

-- 
Bill Davidsen <davidsen@....com>
   "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot
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