linux-kernel - Re: Trusted kernel patchset for Secure Boot lockdown

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Date:	Fri, 14 Mar 2014 20:43:57 +0000
From:	Matthew Garrett <matthew.garrett@...ula.com>
To:	"david@...g.hm" <david@...g.hm>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"jmorris@...ei.org" <jmorris@...ei.org>,
	"keescook@...omium.org" <keescook@...omium.org>,
	"linux-security-module@...r.kernel.org" 
	<linux-security-module@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"hpa@...or.com" <hpa@...or.com>,
	"jwboyer@...oraproject.org" <jwboyer@...oraproject.org>,
	"gnomes@...rguk.ukuu.org.uk" <gnomes@...rguk.ukuu.org.uk>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
Subject: Re: Trusted kernel patchset for Secure Boot lockdown

On Fri, 2014-03-14 at 13:37 -0700, David Lang wrote:
> On Fri, 14 Mar 2014, Matthew Garrett wrote:
> > As an example, imagine a platform with the bootloader and kernel on
> > read-only media. The platform can assert that the kernel is trusted even
> > if there's no measurement of the kernel.
> 
> Trusted by who?

The platform. If you don't trust the platform's ability to make that
decision then that's something that informs your own behaviour, not the
platform's.

> Alan is saying measured because then if it matches what the owner of that device 
> intends it's trusted, but just because you trust it doesn't mean that I trust 
> it, and it doesn't mean that the russian government should trust it, etc.

"Measured" has a specific meaning. If you trust a file based on its
source rather than some property of the file itself, you're not
measuring it.

-- 
Matthew Garrett <matthew.garrett@...ula.com>