Re: RFC: sign the modules at install time

From: Rusty Russell
Date: Sat Oct 20 2012 - 00:15:01 EST

Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> writes:
> Hi Rusty,
> On Fri, 19 Oct 2012 11:53:15 +1030 Rusty Russell <rusty@xxxxxxxxxxxxxxx> wrote:
>> Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> writes:
>> > On Wed, Oct 17, 2012 at 10:34 PM, Rusty Russell <rusty@xxxxxxxxxxxxxxx> 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.

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