linux-kernel - Re: [PATCH v2] MODSIGN: Only sign modules if built in-tree

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Date:	Mon, 5 Nov 2012 08:24:25 -0500
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 v2] MODSIGN: Only sign modules if built in-tree

On Mon, Nov 05, 2012 at 12:31:39PM +1030, Rusty Russell wrote:
> Josh Boyer <jwboyer@...hat.com> writes:
> > diff --git a/Makefile b/Makefile
> > index 14c93b3..7e27d51 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 = $(SIGNFAIL) || perl $(srctree)/scripts/sign-file $(MODSECKEY) $(MODPUBKEY)
> >  else
> >  mod_sign_cmd = true
> >  endif
> 
> Huh?  'true || perl' never runs perl due to short circuiting.

Right.  Why would we even bother running the perl fragment for
out-of-tree modules, when the entire purpose of the patch was to not
sign out-of-tree modules?

> Let's do this instead.  Tested here, please ack.

Sure, will test shortly.

josh
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