linux-kernel - Re: Linux Security *Module* Framework (Was: LSM conversion to static interface)

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Date:	Wed, 24 Oct 2007 22:46:58 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Crispin Cowan <crispin@...spincowan.com>
cc:	Simon Arlott <simon@...e.lp0.eu>, Adrian Bunk <bunk@...nel.org>,
	Chris Wright <chrisw@...s-sol.org>,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andreas Gruenbacher <agruen@...e.de>,
	Thomas Fricaccia <thomas_fricacci@...oo.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	James Morris <jmorris@...ei.org>,
	Giacomo Catenazzi <cate@...ian.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: Linux Security *Module* Framework (Was: LSM conversion to static
 interface)

On Oct 24 2007 13:18, Crispin Cowan wrote:
>Jan Engelhardt wrote:
>> On Oct 24 2007 19:11, Simon Arlott wrote:
>>   
>>> * (I've got a list of access rules which are scanned in order until one of 
>>> them matches, and an array of one bit for every port for per-port default 
>>> allow/deny - although the latter could be removed.
>>> http://svn.lp0.eu/simon/portac/trunk/)
>>>     
>> Besides the 'feature' of inhibiting port binding,
>> is not this task of blocking connections something for a firewall?
>>   
>So now you are criticizing his module. Arguing about the merits of
>security semantics. This is exactly why Linus wanted LSM, so we don't
>have to have these kinds of discussions, at least not on LKML :)

This was a question. I was perfectly aware that iptables alone
does not prohibit binding, and there are reasons to inhibit binding.

But sometimes, a coder does not know where to start - chances are,
that someone else wanting to do bind(2) inhibiting is doing it
with a syscall table change. Or coder did not notice that a firewall
is sufficient for the task to be achieved (which is not always the
case - hence the question).
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