netdev - Re: [RFC PATCH 0/2] selinux: avoid nf hooks overhead when not needed

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Date:	Wed, 06 Apr 2016 14:23:16 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	paul@...l-moore.com
Cc:	pabeni@...hat.com, linux-security-module@...r.kernel.org,
	james.l.morris@...cle.com, agruenba@...hat.com, sds@...ho.nsa.gov,
	fw@...len.de, netdev@...r.kernel.org, selinux@...ho.nsa.gov
Subject: Re: [RFC PATCH 0/2] selinux: avoid nf hooks overhead when not
 needed

From: Paul Moore <paul@...l-moore.com>
Date: Wed, 6 Apr 2016 10:07:27 -0400

> "While marking the LSM hook structure doesn't directly affect the
> SELinux netfilter hooks, once we remove the ability to deregister the
> LSM hooks we will have no need to support deregistering netfilter
> hooks and I expect we will drop that functionality as well to help
> decrease the risk of tampering."

This is not a reasonable postiion.

The performance implications are non-trivial for using netfilter hooks
when they aren't actually needed.