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Date:	Tue, 26 Feb 2008 07:39:36 -0500
From:	Stephen Smalley <sds@...ho.nsa.gov>
To:	James Morris <jmorris@...ei.org>
Cc:	Alexey Dobriyan <adobriyan@...ru>, linux-kernel@...r.kernel.org,
	eparis@...isplace.org, casey@...aufler-ca.com
Subject: Re: SMACK or SELinux, but not both


On Tue, 2008-02-26 at 20:28 +1100, James Morris wrote:
> On Tue, 26 Feb 2008, Alexey Dobriyan wrote:
> 
> > If SELinux is registered before SMACK, SMACK panics after
> > register_security() call.
> > 
> > If SMACK is registered before SELinux, SELinux panics after
> > register_security() call.
> > 
> > Consequently allmodconfig kernel doesn't boot. It would be nice if
> > some Kconfig magic to exclude each other will be in place.
> 
> People want to be able to select the security model at boot time, so the 
> option to build both LSMs is required.
> 
> You can stop SELinux from attempting to register as an LSM via selinux=0, 
> which should allow you to boot with just Smack enabled.

Ideally, one could just boot with security=<module> to select the
desired primary security module.  security=smack, security=selinux, or
security=capability.

Having to specify selinux=0 smack=0 foo=0 just to get bar wouldn't be
pretty.  Not that anyone would want to do that, of course...

-- 
Stephen Smalley
National Security Agency

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