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

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Message-ID: <CAHC9VhT0444cEDKsfww7Yj22svSFOfY4ersVhh8up9ZrZ_8rng@mail.gmail.com>
Date:	Wed, 6 Apr 2016 14:36:43 -0400
From:	Paul Moore <paul@...l-moore.com>
To:	David Miller <davem@...emloft.net>
Cc:	pabeni@...hat.com, linux-security-module@...r.kernel.org,
	James Morris <james.l.morris@...cle.com>, agruenba@...hat.com,
	Stephen Smalley <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

On Wed, Apr 6, 2016 at 2:23 PM, David Miller <davem@...emloft.net> wrote:
> 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.

With all due respect, I think you've taken what I consider to be some
unreasonable positions when it comes to the network stack and LSMs in
the past.  We have different perspectives and different priorities as
a result, from my perspective the security advantage gained by
eliminating the ability to disable SELinux at runtime is more
important.

-- 
paul moore
www.paul-moore.com