linux-kernel - Re: [PATCH] MODSIGN: Only sign modules if built in-tree

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Date:	Thu, 1 Nov 2012 10:50:14 -0400
From:	Josh Boyer <jwboyer@...hat.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Bruno Wolff III <bruno@...ff.to>, dhowells@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] MODSIGN: Only sign modules if built in-tree

On Thu, Nov 01, 2012 at 07:26:55AM -0400, Josh Boyer wrote:
> > I prefer something like this (untested):
> > 
> > diff --git a/Makefile b/Makefile
> > index 42d0e56..cb66c8d 100644
> > --- a/Makefile
> > +++ b/Makefile
> > @@ -722,8 +722,14 @@ export mod_strip_cmd
> >  ifeq ($(CONFIG_MODULE_SIG),y)
> >  MODSECKEY = ./signing_key.priv
> >  MODPUBKEY = ./signing_key.x509
> > +ifeq ($(KBUILD_EXTMOD),)
> > +SIGNFAIL = false
> > +else
> > +# External builds might not have a signing key, don't break module_install.
> > +SIGNFAIL = true
> > +endif # KBUILD_EXTMOD
> >  export MODPUBKEY
> > -mod_sign_cmd = perl $(srctree)/scripts/sign-file $(MODSECKEY) $(MODPUBKEY)
> > +mod_sign_cmd = perl $(srctree)/scripts/sign-file $(MODSECKEY) $(MODPUBKEY) || $(SIGNFAIL)
> >  else
> >  mod_sign_cmd = true
> >  endif
> 
> OK.  I'll give this a spin locally today, but at first glance it seems
> like it would do the same.

We need to put $(SIGNFAIL) before the perl script invocation or we get
errors because mod_sign_cmd is passed an argument and sign-file is
treating the "|| $(SIGNFAIL)" as something it's passed.  That was the
only change I needed to make and it works as expected.

Do you want me to send a v2 of the patch, or will you add it yourself
given you've basically written the code?  Either way works for me.

josh
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