linux-kernel - Re: [PATCH 12/12] Add option to automatically set trusted

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Date:	Thu, 27 Feb 2014 10:48:48 -0800
From:	Kees Cook <keescook@...omium.org>
To:	Matthew Garrett <matthew.garrett@...ula.com>
Cc:	"gnomes@...rguk.ukuu.org.uk" <gnomes@...rguk.ukuu.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"jmorris@...ei.org" <jmorris@...ei.org>,
	"hpa@...or.com" <hpa@...or.com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-security-module@...r.kernel.org" 
	<linux-security-module@...r.kernel.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>
Subject: Re: [PATCH 12/12] Add option to automatically set trusted_kernel when
 in Secure Boot mode

On Wed, Feb 26, 2014 at 2:48 PM, Matthew Garrett
<matthew.garrett@...ula.com> wrote:
> On Wed, 2014-02-26 at 22:41 +0000, One Thousand Gnomes wrote:
>> Another issue that needs addressing is firmware. Quite a few of our
>> request_firmware cases load device firmware which is not signed into DMA
>> capable hardware. Probably also worth checking what the
>> architectural guarantees on bogus microcode updates is. Maybe we need
>> firmware signing for such cases to match the mod signing ?
>
> Vendors keep telling me that they're validating firmware for new
> hardware, and I keep tending not to believe them. Meh. The big problem
> with firmware signatures is that we don't necessarily have the right to
> distribute modified versions of the firmware, so we'd need detached
> signature support. I'm certainly not against this.

I have been working on a patch series for this. It will have LSM hooks
for validating firmware origin (via fd) and contents (via blob),
similar to the changes I made for validating module origins. It just
need to finish testing, and I'll post the series. If you want to check
it out in its current state, it's here:

http://git.kernel.org/cgit/linux/kernel/git/kees/linux.git/log/?h=fw-restrict

-Kees

-- 
Kees Cook
Chrome OS Security
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