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

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Message-ID: <20150813112220.GA30251@treble.redhat.com>
Date:	Thu, 13 Aug 2015 06:22:20 -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 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)' >    \
--
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