linux-kernel - Re: [PATCH 04/10] SELinux: Add new labeling type native labels

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Message-Id: <1278595878.2494.186.camel@moss-terrapins.epoch.ncsc.mil>
Date:	Thu, 08 Jul 2010 09:31:18 -0400
From:	"David P. Quigley" <dpquigl@...ho.nsa.gov>
To:	James Morris <jmorris@...ei.org>
Cc:	hch@...radead.org, viro@...iv.linux.org.uk, casey@...aufler-ca.com,
	sds@...ho.nsa.gov, "Matthew N. Dodd" <matthew.dodd@...rta.com>,
	trond.myklebust@....uio.no, bfields@...ldses.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-security-module@...r.kernel.org, selinux@...ho.nsa.gov,
	linux-nfs@...r.kernel.org
Subject: Re: [PATCH 04/10] SELinux: Add new labeling type native labels

On Thu, 2010-07-08 at 09:23 +1000, James Morris wrote:
> On Wed, 7 Jul 2010, David P. Quigley wrote:
> 
> > There currently doesn't exist a labeling type that is adequate for use with
> > labeled NFS. Since NFS doesn't really support xattrs we can't use the use xattr
> > labeling behavior. For this we developed a new labeling type. The native
> > labeling type is used solely by NFS to ensure NFS inodes are labeled at runtime
> > by the NFS code instead of relying on the SELinux security server on the client
> > end.
> 
> It would be useful to have the ability to specify labeling behavior on a 
> per-mount basis, with the default remaining as genfs.
> 
> Otherwise, this is a global policy decision which affects all NFSv4 
> mounts, right?
> 
> 

I don't believe we have that ability in any other file system. If you
want to decide that you want to use genfs style labels on NFSv4 just use
a context mount. That way you can have the default behavior be use
security label support unless you don't want to and then you can have a
context mount.


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