linux-kernel - Re: 'make O=' indigestion with module signing

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Date:   Fri, 12 Mar 2021 09:01:36 +0000
From:   David Howells <dhowells@...hat.com>
To:     Valdis Kl=?utf-8?Q?=c4=93?=tnieks 
        <valdis.kletnieks@...edu>
Cc:     dhowells@...hat.com, David Woodhouse <dwmw2@...radead.org>,
        keyrings@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: 'make O=' indigestion with module signing

Valdis Klētnieks <valdis.kletnieks@...edu> wrote:

> So the root cause was: 'make mrproper doesn't clean certs/' out enough,
> and this chunk of certs/Makefile
> ...
> I admit not being sure how (or if) this should be fixed

It's tricky because CONFIG_MODULE_SIG_KEY may not point to a file, let alone a
file that was autogenerated - it can be given a PKCS#11 URI, for instance.  I
had to put in the autogeneration based on a magic config string value to stop
randconfig blowing up - but it only does the autogeneration if you don't put
in your own file there before building.

Possibly I can add something like:

	clean-files := signing_key.pem x509.genkey

inside the

	ifeq ($(CONFIG_MODULE_SIG_KEY),"certs/signing_key.pem")
	...
	endif

section.

David