linux-kernel - Re: [PATCH 01/11] Security: Add hook to get full maclabel xattr name

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Message-ID: <Xine.LNX.4.64.0802291306141.9062@us.intercode.com.au>
Date:	Fri, 29 Feb 2008 13:15:16 +1100 (EST)
From:	James Morris <jmorris@...ei.org>
To:	Casey Schaufler <casey@...aufler-ca.com>
cc:	Dave Quigley <dpquigl@...ho.nsa.gov>,
	Christoph Hellwig <hch@...radead.org>,
	Stephen Smalley <sds@...ho.nsa.gov>, viro@....linux.org.uk,
	trond.myklebust@....uio.no, bfields@...ldses.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	LSM List <linux-security-module@...r.kernel.org>
Subject: Re: [PATCH 01/11] Security: Add hook to get full maclabel xattr name

On Thu, 28 Feb 2008, Casey Schaufler wrote:

> Easier may be pragmatic, but that does not make it right.
> I suggest, that in my opinion (there, is that sufficiently
> non-confrontational?) that Linux and the LSM are much better
> served by a general xattr protocol than by adding a single
> reccommended attribute.

An xattr protocol is overkill for conveying a MAC label over the network, 
and would still not provide the required semantics.

Please see prior discussion on this e.g.

http://marc.info/?l=linux-kernel&m=120424789929258&w=2

Note that RAs are already used to convey ACLs and all other system-managed 
metatdata.  i.e. an extensible, appropriate infrastructure already exists 
in the NFSv4 protocol, and has been used successfully for similar 
purposes.  We do not need to add a new, generalized protocol to NFSv4 
for this, especially one which does not meet the requirements.

- James
-- 
James Morris
<jmorris@...ei.org>
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