netdev - Re: [RFC PATCH v6 08/16] netlabel: Replace protocol/NetLabel linking with refrerence counts

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Date:	Wed, 1 Oct 2008 19:01:43 +1000 (EST)
From:	James Morris <jmorris@...ei.org>
To:	Paul Moore <paul.moore@...com>
cc:	selinux@...ho.nsa.gov, linux-security-module@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [RFC PATCH v6 08/16] netlabel: Replace protocol/NetLabel linking
 with refrerence counts

On Tue, 16 Sep 2008, Paul Moore wrote:

> NetLabel has always had a list of backpointers in the CIPSO DOI definition
> structure which pointed to the NetLabel LSM domain mapping structures which
> referenced the CIPSO DOI struct.  The rationale for this was that when an
> administrator removed a CIPSO DOI from the system all of the associated
> NetLabel LSM domain mappings should be removed as well; a list of
> backpointers made this a simple operation.
> 
> Unfortunately, while the backpointers did make the removal easier they were
> a bit of a mess from an implementation point of view which was making
> further development difficult.  Since the removal of a CIPSO DOI is a
> realtively rare event it seems to make sense to remove this backpointer
> list as the optimization was hurting us more then it was helping.  However,
> we still need to be able to track when a CIPSO DOI definition is being used
> so replace the backpointer list with a reference count.  In order to
> preserve the current functionality of removing the associated LSM domain
> mappings when a CIPSO DOI is removed we walk the LSM domain mapping table,
> removing the relevant entries.
> 
> Signed-off-by: Paul Moore <paul.moore@...com>

Reviewed-by: James Morris <jmorris@...ei.org>



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