From: Michal Marek <mmarek@suse.cz>
To: David Howells <dhowells@redhat.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] MODSIGN: Discard previous signature when signing modules
Date: Wed, 27 Mar 2013 00:48:24 +0100 [thread overview]
Message-ID: <515233C8.40205@suse.cz> (raw)
In-Reply-To: <960.1364340890@warthog.procyon.org.uk>
On 27.3.2013 00:34, David Howells wrote:
> Michal Marek <mmarek@suse.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.
The question is if this would be useful and desired, as opposed to
supporting a list of signatures that all sign the *same* message. My bet
is that such chain of signatures is more likely going to indicate error
than intention. But I don't care much, I haven't run into this myself, I
just thought that others migh do.
Michal
prev parent reply other threads:[~2013-03-26 23:48 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-26 22:58 [PATCH] MODSIGN: Discard previous signature when signing modules Michal Marek
2013-03-26 23:34 ` David Howells
2013-03-26 23:48 ` Michal Marek [this message]
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