linux-kernel - Re: [PATCH 00/12] One more attempt at useful kernel lockdown

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Date:	Mon, 9 Sep 2013 20:17:41 +0000
From:	Matthew Garrett <matthew.garrett@...ula.com>
To:	David Lang <david@...g.hm>
CC:	"Valdis.Kletnieks@...edu" <Valdis.Kletnieks@...edu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"keescook@...omium.org" <keescook@...omium.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"hpa@...or.com" <hpa@...or.com>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	"jmorris@...ei.org" <jmorris@...ei.org>,
	"linux-security-module@...r.kernel.org" 
	<linux-security-module@...r.kernel.org>
Subject: Re: [PATCH 00/12] One more attempt at useful kernel lockdown

On Mon, 2013-09-09 at 13:15 -0700, David Lang wrote:
> On Mon, 9 Sep 2013, Matthew Garrett wrote:
> 
> > On Mon, 2013-09-09 at 12:59 -0700, David Lang wrote:
> >
> >> At least you should be able to unify the implementation, even if you don't unify
> >> the user visible knob
> >
> > Well sure, I could take this integer and merge another integer into it,
> > but now you have the same value being modified by two different
> > user-visible interfaces which aren't guaranteed to have the same
> > semantics.
> 
> It's not that you merge integers, it's that the knob that currently sets the 
> signed module only loading but not anything else would have it's implementation 
> changed so that instead of doing whatever it currently does, it would instead 
> make an internal call to set the "require signed modules" bit, and that one 
> place would implement the lockdown.

Thanks.

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