linux-kernel - Re: [PATCH 0/4] KEYS: validate key trust with owner and builtin keys only

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Date:	Tue, 10 Jun 2014 23:08:15 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
	Josh Boyer <jwboyer@...hat.com>,
	David Howells <dhowells@...hat.com>,
	Dmitry Kasatkin <d.kasatkin@...sung.com>,
	keyrings <keyrings@...ux-nfs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-security-module <linux-security-module@...r.kernel.org>
Subject: Re: [PATCH 0/4] KEYS: validate key trust with owner and builtin
 keys only

On Wed, 2014-06-11 at 03:22 +0100, Matthew Garrett wrote: 
> On Tue, Jun 10, 2014 at 09:24:53PM -0400, Mimi Zohar wrote:
> > On Tue, 2014-06-10 at 22:40 +0100, Matthew Garrett wrote: 
> > > The hole is that the system trusts keys that you don't trust. The 
> > > appropriate thing to do is to remove that trust from the entire system, 
> > > not just one layer of the system. If people gain the impression that 
> > > they can simply pass a kernel parameter and avoid trusting the vendor 
> > > keys, they'll be upset to discover that it's easily circumvented.
> > 
> > Assuming I remove all the keys I don't trust, there are still keys that
> > are trusted while booting, but are not necessary afterwards.  We should
> > be able to limit the scope of where and when keys are trusted.
> 
> Providing a userspace mechanism for selectively dropping keys from the 
> kernel seems like a good thing?

No, patch "KEYS: verify a certificate is signed by a 'trusted' key" adds
signed public keys.

Mimi

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