linux-kernel - Re: [PATCH v2 5/5] LSM: LoadPin for kernel file loading restrictions

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Date:	Wed, 30 Mar 2016 16:24:01 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Kees Cook <keescook@...omium.org>,
	James Morris <jmorris@...ei.org>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Kalle Valo <kvalo@...eaurora.org>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Joe Perches <joe@...ches.com>,
	Guenter Roeck <linux@...ck-us.net>,
	Jiri Slaby <jslaby@...e.com>, Paul Moore <pmoore@...hat.com>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	Casey Schaufler <casey@...aufler-ca.com>,
	Andreas Gruenbacher <agruenba@...hat.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Vitaly Kuznetsov <vkuznets@...hat.com>,
	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 5/5] LSM: LoadPin for kernel file loading restrictions

On Mon, 2016-03-28 at 14:38 -0700, Andrew Morton wrote:
> On Mon, 28 Mar 2016 14:14:22 -0700 Kees Cook <keescook@...omium.org> wrote:
> 
> > This LSM enforces that kernel-loaded files (modules, firmware, etc)
> > must all come from the same filesystem, with the expectation that
> > such a filesystem is backed by a read-only device such as dm-verity
> > or CDROM. This allows systems that have a verified and/or unchangeable
> > filesystem to enforce module and firmware loading restrictions without
> > needing to sign the files individually.
> 
> Patchset generally looks good to me.  It's regrettable that a load of
> stuff was added to lib/ for one obscure LSM but hopefully (doubtfully)
> someone else will find a use for some of it.

I'm planning on adding support for measuring buffers, like the boot
command line, which will need to be string safe.

Mimi