linux-kernel - Re: [RFD] linux-firmware key arrangement for firmware signing

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Message-ID: <1432669955.2450.269.camel@linux.vnet.ibm.com>
Date:	Tue, 26 May 2015 15:52:35 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
Cc:	Petko Manolov <petkan@...-labs.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Seth Forshee <seth.forshee@...onical.com>,
	"Luis R. Rodriguez" <mcgrof@...e.com>,
	linux-security-module@...r.kernel.org, james.l.morris@...cle.com,
	serge@...lyn.com, linux-kernel@...r.kernel.org,
	linux-wireless@...r.kernel.org,
	David Howells <dhowells@...hat.com>,
	Kyle McMartin <kyle@...nel.org>,
	David Woodhouse <david.woodhouse@...el.com>,
	Joey Lee <jlee@...e.de>, Rusty Russell <rusty@...tcorp.com.au>,
	mricon@...nel.org
Subject: Re: [RFD] linux-firmware key arrangement for firmware signing

On Tue, 2015-05-26 at 18:08 +0100, One Thousand Gnomes wrote:

> IMHO we want the supplier of a given firmware providing signatures on
> the firmware git tree if this is done. A generic linux-firmware owned key
> would be both a horrendously inviting attack target, and a single point of
> failure.
> 
> Git can already do all the needed commit signing bits unless I'm missing
> something here ?

Nice!  I haven't tried signing commits yet.  Assuming the signatures can
be extracted from git, the firmware blob git commit signature could be
stored either as a security xattr or appended (eg. similar to kernel
modules).  The end system owner could then make the decision to load the
associated public key or not.

Mimi

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