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From: Kyle McMartin <jkkm@jkkm.org>
To: Seth Forshee <seth.forshee@canonical.com>
Cc: "Luis R. Rodriguez" <mcgrof@suse.com>,
	linux-security-module@vger.kernel.org, james.l.morris@oracle.com,
	serge@hallyn.com, linux-kernel@vger.kernel.org,
	linux-wireless@vger.kernel.org,
	David Howells <dhowells@redhat.com>,
	David Woodhouse <david.woodhouse@intel.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Joey Lee <jlee@suse.de>, Rusty Russell <rusty@rustcorp.com.au>,
	zohar@linux.vnet.ibm.com, mricon@kernel.org
Subject: Re: [RFD] linux-firmware key arrangement for firmware signing
Date: Wed, 20 May 2015 16:35:51 -0400	[thread overview]
Message-ID: <20150520203551.GA13557@foundry.jkkm.org> (raw)
In-Reply-To: <20150520140426.GB126473@ubuntu-hedt>

On Wed, May 20, 2015 at 09:04:26AM -0500, Seth Forshee wrote:
> I raised the question of key revocation when we discussed this on irc,
> but it wasn't answered to my satisfaction. If a key signed by the
> kernel-embedded key is compromised, how can that key be revoked so that
> it is no longer trusted?
> 
> Someone mentioned UEFI blacklists, which I don't know much about, but
> not all systems have UEFI. The only reliable option that comes to mind
> for me is an in-kernel blacklist of keys which should no longer be
> trusted.
> 

I think the solution here is two-fold... first, we'll probably try some
to use a HSM for signing, so there's extremely low risk of compromise.
Secondly, if we annotate the key such that it can only be used for
firmware, a compromise of my key won't allow you to kexec or load kernel
modules.

regards, --Kyle

  parent reply	other threads:[~2015-05-20 20:35 UTC|newest]

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-05-19 20:02 [RFD] linux-firmware key arrangement for firmware signing Luis R. Rodriguez
2015-05-19 20:40 ` Luis R. Rodriguez
2015-05-19 20:59 ` Andy Lutomirski
2015-05-19 22:11   ` Luis R. Rodriguez
2015-05-19 22:40     ` Andy Lutomirski
2015-05-19 23:30   ` Julian Calaby
2015-05-19 23:42     ` Andy Lutomirski
2015-05-20  0:39       ` Luis R. Rodriguez
2015-05-20  0:41         ` Andy Lutomirski
2015-05-21 22:26           ` Luis R. Rodriguez
2015-05-21 23:15             ` Casey Schaufler
2015-05-21 15:51   ` David Howells
2015-05-21 16:30     ` Mimi Zohar
2015-05-21 16:39     ` Andy Lutomirski
2015-05-21 16:51       ` Petko Manolov
2015-05-21 16:55         ` Andy Lutomirski
2015-05-21 17:44           ` Petko Manolov
2015-05-21 16:43     ` Petko Manolov
2015-05-21 16:48       ` Andy Lutomirski
2015-05-21 16:58         ` Petko Manolov
2015-05-21 16:59       ` Mimi Zohar
2015-05-19 21:48 ` Mimi Zohar
2015-05-19 22:19   ` Luis R. Rodriguez
2015-05-19 23:37     ` Mimi Zohar
2015-05-20  0:22       ` Luis R. Rodriguez
2015-05-20  1:06         ` Mimi Zohar
2015-05-20  1:29           ` Andy Lutomirski
2015-05-20  2:05             ` Mimi Zohar
2015-05-20  2:10               ` Andy Lutomirski
2015-05-20 15:49                 ` Petko Manolov
2015-05-20 16:08         ` Petko Manolov
2015-05-20 14:04 ` Seth Forshee
2015-05-20 16:24   ` One Thousand Gnomes
2015-05-20 16:46     ` Petko Manolov
2015-05-21  4:41       ` Greg Kroah-Hartman
2015-05-21  5:41         ` Petko Manolov
2015-05-21  6:14           ` Greg Kroah-Hartman
2015-05-21 13:05             ` Mimi Zohar
2015-05-21 15:45               ` Greg Kroah-Hartman
2015-05-21 15:53                 ` Petko Manolov
2015-05-21 16:57                   ` Greg Kroah-Hartman
2015-05-26 17:08                   ` One Thousand Gnomes
2015-05-26 19:15                     ` Petko Manolov
2015-05-26 19:52                     ` Mimi Zohar
2015-05-26 23:06                   ` David Howells
2015-05-21 16:03                 ` Woodhouse, David
2015-05-21 16:22                   ` Mimi Zohar
2015-05-21 16:31                     ` Woodhouse, David
2015-05-21 17:02                   ` gregkh
2015-05-21 17:14                     ` Petko Manolov
2015-05-21 18:23                     ` Luis R. Rodriguez
2015-05-21 18:30                       ` Luis R. Rodriguez
2015-05-21 19:32                     ` Woodhouse, David
2015-05-21 17:49                   ` Luis R. Rodriguez
2015-05-21 14:45             ` Petko Manolov
2015-05-21 22:50     ` Luis R. Rodriguez
2015-05-20 20:35   ` Kyle McMartin [this message]
2015-05-20 15:08 ` David Howells
2015-05-20 15:47   ` Seth Forshee
2015-05-21 16:23   ` David Howells
2015-05-20 15:14 ` David Howells

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