linux-kernel - Re: [PATCH try #2] security: Convert LSM into a static interface

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Date:	Mon, 25 Jun 2007 22:57:31 -0500
From:	"Serge E. Hallyn" <serge@...lyn.com>
To:	James Morris <jmorris@...ei.org>
Cc:	Andreas Gruenbacher <agruen@...e.de>,
	Chris Wright <chrisw@...s-sol.org>,
	linux-security-module@...r.kernel.org,
	"Serge E. Hallyn" <serue@...ibm.com>,
	Andrew Morgan <agm@...gle.com>,
	Andrew Morton <akpm@...gle.com>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	lkml <linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Greg KH <greg@...ah.com>, Eric Paris <eparis@...hat.com>
Subject: Re: [PATCH try #2] security: Convert LSM into a static interface

Quoting James Morris (jmorris@...ei.org):
> On Mon, 25 Jun 2007, Andreas Gruenbacher wrote:
> 
> > It's useful for some LSMs to be modular, and LSMs which are y/n options won't 
> > have any security architecture issues with unloading at all. 
> 
> Which LSMs?  Upstream, there are SELinux and capabilty, and they're not 
> safe as loadable modules.
> 
> > The mere fact 
> > that SELinux cannot be built as a module is a rather weak argument for 
> > disabling LSM modules as a whole, so  please don't.
> 
> That's not the argument.  Please review the thread.

The argument is 'abuse', right?

Abuse is defined as using the LSM hooks for non-security applications,
right?

It seems to me that the community is doing a good job of discouraging
such abuse - by redirecting the "wrong-doers" to implement proper
upstream solutions, i.e. taskstats, the audit subsystem, etc.

Such encouragement seems a far better response than taking away freedoms
and flexibility from everyone.

-serge
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