linux-kernel - Re: [PATCH] MODSIGN: Change default key details [ver #2]

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Date:	Thu, 30 Apr 2015 11:00:00 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Sedat Dilek <sedat.dilek@...il.com>
Cc:	David Howells <dhowells@...hat.com>, keyrings@...ux-nfs.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	LKML <linux-kernel@...r.kernel.org>,
	LSM List <linux-security-module@...r.kernel.org>,
	James Morris <james.l.morris@...cle.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] MODSIGN: Change default key details [ver #2]

On Thu, Apr 30, 2015 at 10:49 AM, Sedat Dilek <sedat.dilek@...il.com> wrote:
>>
>> Yeah.  I've had other reports, but I can't see anything obvious.  I have a
>> suspicion there may be something not declared quite right in the makefile - or
>> even a race in make -jN, but I don't know how to reproduce it.
>
> Ah OK, (un)nice to read.

Yeah. I've gotten "X.509 certificate list changed" messages
occasionally, which makes no sense considering that I never have any
keys except for the default signing key.

So there is something odd foinf on with "kernel/.x509.list". The rules
to generate it aren't really _rules_. It's black magic. Actually, it's
*generated* with a rule, but then it has that magical "if the contents
don't match" thing that is _not_ a real make rule.

It would be lovely to replace that with a real "if_changed" rule,
because I do think the magic hackery is what the confuses make. Maybe
some concurrent build reads the file - to check if it's the same - in
one make instance while it's being generated in another. Something. [
Wild handwaving going on ].

                    Linus
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