linux-kernel - Re: [PATCH v1 02/12] kernel: generalize module signing as system data signing

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Message-ID: <14325.1430914129@warthog.procyon.org.uk>
Date:	Wed, 06 May 2015 13:08:49 +0100
From:	David Howells <dhowells@...hat.com>
To:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
Cc:	dhowells@...hat.com, rusty@...tcorp.com.au, ming.lei@...onical.com,
	seth.forshee@...onical.com, kyle@...nel.org,
	akpm@...ux-foundation.org, gregkh@...uxfoundation.org,
	keescook@...omium.org, casey@...aufler-ca.com, tiwai@...e.de,
	mjg59@...f.ucam.org, wireless-regdb@...ts.infradead.org,
	linux-wireless@...r.kernel.org, jlee@...e.com,
	linux-kernel@...r.kernel.org, "Luis R. Rodriguez" <mcgrof@...e.com>
Subject: Re: [PATCH v1 02/12] kernel: generalize module signing as system data signing

Luis R. Rodriguez <mcgrof@...not-panic.com> wrote:

> This generalizes the module signing code as helpers, we do
> this as we'll later re-use this same code for firmware and
> other system data signing.

I'm trying to move us to the use of PKCS#7 certificates as module signatures.
See here:

	http://git.kernel.org/cgit/linux/kernel/git/dhowells/linux-fs.git/log/?h=modsign-pkcs7

I would suggest you use this as a base.

Also, I would suggest, if you can manage it, either:

 (1) Keep the signature and the firmware blobs separate on disk for copyright
     and/or licensing purposes.

 (2) Put the firmware blob inside the PKCS#7 message as the embedded data.

David
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