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

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Date:	Thu, 13 Aug 2015 09:42:25 -0500
From:	Chris J Arges <chris.j.arges@...onical.com>
To:	Josh Poimboeuf <jpoimboe@...hat.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 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:

diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index a1270d3..0181915 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -243,7 +243,7 @@ endif
 
 ifdef CONFIG_STACK_VALIDATION
 
-stackvalidate = $(objtree)/scripts/stackvalidate/stackvalidate
+__stackvalidate = $(objtree)/scripts/stackvalidate/stackvalidate
 
 ifndef CONFIG_FRAME_POINTER
 nofp = --no-frame-pointer
@@ -251,17 +251,20 @@ endif
 
 # Set STACKVALIDATE_foo.o=n to skip stack validation for a file.
 # Set STACKVALIDATE=n to skip stack validation for a directory.
+stackvalidate = $(if $(patsubst n%,, \
+	$(STACKVALIDATE_$(basetarget).o)$(STACKVALIDATE)y), \
+	$(__stackvalidate))
 cmd_stackvalidate = $(if $(patsubst n%,, \
 	$(STACKVALIDATE_$(basetarget).o)$(STACKVALIDATE)y), \
-	$(stackvalidate) $(nofp) "$(@)";)
+	$(__stackvalidate) $(nofp) "$(@)";)
 
 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)' >    \
diff --git a/scripts/mod/Makefile b/scripts/mod/Makefile
index c11212f..374c413 100644
--- a/scripts/mod/Makefile
+++ b/scripts/mod/Makefile
@@ -1,3 +1,5 @@
+STACKVALIDATE	:= n
+
 hostprogs-y	:= modpost mk_elfconfig
 always		:= $(hostprogs-y) empty.o

Thanks,
--chris
 
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