linux-kernel - Re: RFC: sign the modules at install time

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Message-ID: <87sj993ik2.fsf@rustcorp.com.au>
Date:	Sat, 20 Oct 2012 14:23:49 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	David Howells <dhowells@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: RFC: sign the modules at install time

Stephen Rothwell <sfr@...b.auug.org.au> writes:
> Hi Rusty,
>
> On Fri, 19 Oct 2012 11:53:15 +1030 Rusty Russell <rusty@...tcorp.com.au> wrote:
>>
>> Linus Torvalds <torvalds@...ux-foundation.org> writes:
>> > On Wed, Oct 17, 2012 at 10:34 PM, Rusty Russell <rusty@...tcorp.com.au> wrote:
>> >>
>> >> Hacking the keyid and signer-name to be extracted every time by
>> >> sign-file takes my modules_install time from 18.6 seconds to 19.1.  We'd
>> >> get that back easily by making sign-file a perl script anyway; it calls
>> >> out to perl 3 times already.
>> >
>> > Ok, that tiny slowdown seems worth the cleanup, especially if we'd get
>> > it back from somebody re-writing it in perl.
>> >
>> > Want to sign off on the two patches, or put them in your git tree?
>> 
>> Smerged them together: no point moving the x509keyid script now.
>> I dropped the optional dst arg, since we don't use it.
>
> So, this still generates the keys during the normal build, right?  That
> would be a problem for build servers that have limited randomness
> available to them, I think.

Yes.  You can either continue to disable module signatures, or copy some
pre-made keys in the toplevel: signing_key.priv and signing_key.x509.

Cheers,
Rusty.
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