linux-kernel - Re: [PATCH 08/14] NFSv4: Add label recommended attribute and NFSv4 flags

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Message-Id: <1238761424.7541.68.camel@moss-terrapins.epoch.ncsc.mil>
Date:	Fri, 03 Apr 2009 08:23:44 -0400
From:	"David P. Quigley" <dpquigl@...ho.nsa.gov>
To:	James Morris <jmorris@...ei.org>
Cc:	casey@...aufler-ca.com, sds@...ho.nsa.gov,
	"Matthew N. Dodd" <matthew.dodd@...rta.com>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-security-module@...r.kernel.org, selinux@...ho.nsa.gov,
	labeled-nfs@...ux-nfs.org
Subject: Re: [PATCH 08/14] NFSv4: Add label recommended attribute and NFSv4
 flags

On Fri, 2009-04-03 at 22:43 +1100, James Morris wrote:
> On Fri, 3 Apr 2009, David P. Quigley wrote:
> 
> > We tried to change this to be dynamically allocated based on what was
> > coming off of the wire but we ran into a problem that it required us to
> > do allocations where they really shouldn't be done in the rpc/nfsv4
> > code. Trond suggested to make this static and that if someone really
> > needed more than a page for their label that something was horrifically
> > wrong. I'm tempted to agree with him on this but there are people trying
> > to send contexts with an MLS component with every other compartment set
> > which tend to be really large. 
> 
> Well, future labels might include cryptographic information, for example.
> 

<removing people from the CC who probably don't care about this>

Could you expand on why this might be needed or what applications would
use this? It's unclear to me what sort of crypto information would be in
a context. I know the ecryptfs guys were trying to make crypto decisions
based on SELinux context in some cases but I never heard of wanting to
put that kind of information into the context.

Dave

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