linux-kernel - Re: [PATCH 00/23] Crypto keys and module signing

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Message-ID: <CA+5PVA5qCiYNppOBihKfsqvyNWwBsBsyGD7SmJaphV_67HG1aQ@mail.gmail.com>
Date:	Thu, 31 May 2012 11:35:23 -0400
From:	Josh Boyer <jwboyer@...il.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	David Howells <dhowells@...hat.com>, kyle@...artin.ca,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, keyrings@...ux-nfs.org
Subject: Re: [PATCH 00/23] Crypto keys and module signing

On Sun, May 27, 2012 at 1:41 AM, Rusty Russell <rusty@...tcorp.com.au> wrote:
> On Thu, 24 May 2012 15:00:51 +0100, David Howells <dhowells@...hat.com> wrote:
>> > > Why would you want multiple signatures?  That just complicates things.
>> >
>> > The code above stays pretty simple; if the signature fails, you set size
>> > to i, and loop again.  As I said, if you know exactly how you're going
>> > to strip the modules, you can avoid storing the stripped module and
>> > simply append both signatures.
>>
>> You still haven't justified it.  One of your arguments about rejecting the ELF
>> parsing version was that it was too big for no useful extra value that I could
>> justify.  Supporting multiple signatures adds extra size and complexity for no
>> obvious value.
>
> One loop is a lot easier to justify that the ELF-parsing mess.  And it
> can be done in a backwards compatible way tomorrow: old kernels will
> only check the last signature.
>
> I had assumed you'd rather maintain a stable strip util which you can
> use on kernel modules than rework your module builds.  I guess not.

Could you elaborate on this part a bit?  Do you mean integrate a
standalone strip utility in the kernel sources and maintain that for
use during module builds?  Or am I misunderstanding and you meant
something else?

I can see how that sounds simple and desirable from one aspect, but
it seems somewhat odd to me to duplicate the existing (or create from
scratch) strip utilities.

josh
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