linux-kernel - Re: [PATCH] MODSIGN: Discard previous signature when signing modules

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Message-ID: <960.1364340890@warthog.procyon.org.uk>
Date:	Tue, 26 Mar 2013 23:34:50 +0000
From:	David Howells <dhowells@...hat.com>
To:	Michal Marek <mmarek@...e.cz>
Cc:	dhowells@...hat.com, Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] MODSIGN: Discard previous signature when signing modules

Michal Marek <mmarek@...e.cz> wrote:

> The format only supports one signature, so discard any previous
> signature before signing the module.

That's not totally true.  The format does not preclude multiple signatures.
You can just add another signature block on the end that signs everything
inside of that, including all previous signatures.  The alteration to the code
to check all of them would be very small, I think.

David
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