linux-kernel - Re: Trusted kernel patchset

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Message-ID: <550962C5.5050400@collabora.co.uk>
Date:	Wed, 18 Mar 2015 11:34:29 +0000
From:	Simon McVittie <simon.mcvittie@...labora.co.uk>
To:	Matthew Garrett <matthew.garrett@...ula.com>
CC:	"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>,
	"gnomes@...rguk.ukuu.org.uk" <gnomes@...rguk.ukuu.org.uk>,
	"serge@...lyn.com" <serge@...lyn.com>,
	"linux-security-module@...r.kernel.org" 
	<linux-security-module@...r.kernel.org>,
	"hpa@...or.com" <hpa@...or.com>
Subject: Re: Trusted kernel patchset

On 17/03/15 20:42, Matthew Garrett wrote:
> On Tue, 2015-03-17 at 20:22 +0000, Simon McVittie wrote:
>> Is the intention instead that it will make privileged bits of userland
>> more careful to avoid breaking the trust chain in ways that would "fail
>> safe" by refusing to boot?
> 
> Not really. It's intended to avoid the situation where privileged
> userspace is able to modify the running kernel to an extent that's
> broadly equivalent to booting an arbitrary kernel.

Sorry, I was imprecise about what I meant by "it". I understand that the
intention of the patchset as a whole is to prevent privileged userspace
from subverting the kernel; I was asking about the intention of the
ability to read from /sys/kernel/security/trusted_kernel.

-- 
Simon McVittie
Collabora Ltd. <http://www.collabora.com/>

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