linux-kernel - Re: Trusted kernel patchset

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Date:	Mon, 16 Mar 2015 22:54:54 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Matthew Garrett <matthew.garrett@...ula.com>
cc:	"gnomes@...rguk.ukuu.org.uk" <gnomes@...rguk.ukuu.org.uk>,
	"keescook@...omium.org" <keescook@...omium.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"james.l.morris@...cle.com" <james.l.morris@...cle.com>,
	"serge@...lyn.com" <serge@...lyn.com>,
	"linux-security-module@...r.kernel.org" 
	<linux-security-module@...r.kernel.org>,
	"hpa@...or.com" <hpa@...or.com>, jlee@...e.com
Subject: Re: Trusted kernel patchset

On Mon, 16 Mar 2015, Matthew Garrett wrote:

> > - All suspend/resumes allow modifying the kernel. I can boot Linux
> >   suspend, boot windows, modify the Linux restore image, boot Linux and
> >   own the box. You would need to sign the resume image somehow I think or
> >   just disable all suspend/resume
> 
> I'm kind of torn on this - yes, there are deployment scenarios where
> hibernation can be used to circumvent the restrictions, but there are
> also scenarios where that can be avoided (eg, the bootloader verifies
> some state with respect to the hibernation image).

[ adding Joey to CC ]

Just for completness -- there is a way around this:

	https://lkml.org/lkml/2013/9/14/183

The series is not really the optimal one, as Alan Stern later figured out 
that symmetric cryptography is strong enough to achieve the same goal, but 
I am not sure whether Joey implemented that idea already.

-- 
Jiri Kosina
SUSE Labs

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