linux-kernel - Re: [PATCH 08/28] SECURITY: Allow kernel services to override LSM settings for task actions [try #2]

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Date:	Wed, 12 Dec 2007 09:41:55 -0500
From:	Karl MacMillan <kmacmill@...hat.com>
To:	Stephen Smalley <sds@...ho.nsa.gov>
Cc:	David Howells <dhowells@...hat.com>, viro@....linux.org.uk,
	hch@...radead.org, Trond.Myklebust@...app.com,
	casey@...aufler-ca.com, linux-kernel@...r.kernel.org,
	selinux@...ho.nsa.gov, linux-security-module@...r.kernel.org
Subject: Re: [PATCH 08/28] SECURITY: Allow kernel services to override LSM
	settings for task actions [try #2]


On Tue, 2007-12-11 at 14:37 -0500, Stephen Smalley wrote:
> On Mon, 2007-12-10 at 23:36 +0000, David Howells wrote:
> > Stephen Smalley <sds@...ho.nsa.gov> wrote:
> > 
> > > From a config file whose pathname would be provided by libselinux (ala
> > > the way in which dbusd imports contexts), or directly as a context
> > > returned by a libselinux function.
> > 
> > That sounds too SELinux specific.  How do I do it so that it works for any
> > LSM?
> 
> You can't.  There is no LSM for userspace; LSM specifically disavowed
> any common userspace API, and that was one of our original
> objections/concerns about it.
> 
> > Is linking against libselinux is a viable option if it's not available under
> > all LSM models?  Is it available under all LSM models?  Perhaps Casey can
> > answer this one.
> 
> Nope, they would all have their own libraries, if they have a library at
> all.  But that isn't your problem - your kernel interface should be
> generic, and your LSM hooks should be generic, but your userspace isn't
> required to be.  Have a look at how many programs in the distribution
> currently link against libselinux, whether directly or by dlopen'ing it.
> 
> > > > I use to do that, but someone objected...  Possibly Karl MacMillan.
> > > 
> > > Yes, but I think I disagreed then too.
> > 
> > So, who's right?
> 
> Karl isn't a maintainer of the SELinux kernel code.  And I had thought
> that even he had reconsidered this idea after further discussion.
> 

That's what I remember as well - I suggested the transition idea and
then, after discussion, agreed that it wasn't the best approach.

And, as Steve points out, it's not my call to make.

Karl

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