linux-kernel - Re: [PATCH v8 00/21] Compile-time stack validation

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Message-ID: <20150813145013.GF30251@treble.redhat.com>
Date:	Thu, 13 Aug 2015 09:50:13 -0500
From:	Josh Poimboeuf <jpoimboe@...hat.com>
To:	Chris J Arges <chris.j.arges@...onical.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Michal Marek <mmarek@...e.cz>,
	Peter Zijlstra <peterz@...radead.org>,
	Andy Lutomirski <luto@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Pedro Alves <palves@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	Bernd Petrovitsch <bernd@...rovitsch.priv.at>, x86@...nel.org,
	live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 00/21] Compile-time stack validation

On Thu, Aug 13, 2015 at 09:42:25AM -0500, Chris J Arges wrote:
> On Thu, Aug 13, 2015 at 06:22:20AM -0500, Josh Poimboeuf wrote:
> > On Wed, Aug 12, 2015 at 04:24:49PM -0500, Chris J Arges wrote:
> > > I still get build failures and I've pared it down to x86_64 defconfig plus:
> > > CONFIG_MODVERSIONS=y
> > > CONFIG_STACK_VALIDATION=y
> > > 
> > > And it seems like some modules may get the .tmp_foo.o treatment while
> > > others end up foo.o so something like the following will not work:
> > > 
> > > cmd_stackvalidate = $(if $(patsubst n%,, \
> > >         $(STACKVALIDATE_$(basetarget).o)$(STACKVALIDATE)y), \
> > >         $(__stackvalidate) $(nofp) "$(@D)/.tmp_$(@F)";)
> > 
> > Does this fix it?
> > 
> > diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> > index ec96c51..0181915 100644
> > --- a/scripts/Makefile.build
> > +++ b/scripts/Makefile.build
> > @@ -263,8 +263,8 @@ endif # CONFIG_STACK_VALIDATION
> >  define rule_cc_o_c
> >  	$(call echo-cmd,checksrc) $(cmd_checksrc)			  \
> >  	$(call echo-cmd,cc_o_c) $(cmd_cc_o_c);				  \
> > -	$(cmd_stackvalidate)						  \
> >  	$(cmd_modversions)						  \
> > +	$(cmd_stackvalidate)						  \
> >  	$(call echo-cmd,record_mcount)					  \
> >  	$(cmd_record_mcount)						  \
> >  	scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' >    \
> >
> 
> Josh,
> 
> Yes, this fixes my build. For completeness this is my current diff:

Great!  I'll roll both patches into v10.

-- 
Josh
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