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

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Date:   Sun, 9 May 2021 17:11:12 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     David Howells <dhowells@...hat.com>
Cc:     Valdis Klētnieks <valdis.kletnieks@...edu>,
        David Woodhouse <dwmw2@...radead.org>,
        keyrings@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: 'make O=' indigestion with module signing


* David Howells <dhowells@...hat.com> wrote:

> 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.

Note that this bug is now upstream in Linus's tree and has broken
the deb-pkg distro kernel build method.

Would be nice to make 'make mrproper' work again.

Thanks,

	Ingo