linux-kernel - Re: [PATCH RFC 0/4] Add firmware signature file check

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Date:	Tue, 06 Nov 2012 00:05:25 +0000
From:	David Howells <dhowells@...hat.com>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	dhowells@...hat.com, Matthew Garrett <mjg59@...f.ucam.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, joeyli <jlee@...e.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, linux-efi@...r.kernel.org
Subject: Re: [PATCH RFC 0/4] Add firmware signature file check


David Howells <dhowells@...hat.com> wrote:

> Takashi Iwai <tiwai@...e.de> wrote:
> 
> > this is a patch series to add the support for firmware signature
> > check.  At this time, the kernel checks extra signature file (*.sig)
> > for each firmware, instead of embedded signature.
> > It's just a quick hack using the existing module signing mechanism,
> > thus provided only as a proof of concept for now.
> 
> There is another way to do this.  If you look at the patches I proposed to
> wrap keys in PE binaries, you'll find that that can handle PKCS#7 format
> messages as that's what's in the sort of signed PE binary we're dealing with.

See:

	http://git.kernel.org/?p=linux/kernel/git/dhowells/linux-modsign.git;a=shortlog;h=refs/heads/devel-pekey

> You could use this to put the firmware inside a signed-data PKCS#7 message.

Note that the ASN.1 decoder in the kernel would need altering to handle
messages larger than 64KB.

David
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