linux-kernel - Re: [PATCH v13.1 04/23] x86/stacktool: Compile-time stack metadata validation

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Message-ID: <20151001152553.GB4269@treble.redhat.com>
Date:	Thu, 1 Oct 2015 10:25:53 -0500
From:	Josh Poimboeuf <jpoimboe@...hat.com>
To:	Chris J Arges <chris.j.arges@...onical.com>
Cc:	Jiri Slaby <jslaby@...e.cz>, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, live-patching@...r.kernel.org,
	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>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v13.1 04/23] x86/stacktool: Compile-time stack metadata
 validation

On Thu, Oct 01, 2015 at 09:50:51AM -0500, Chris J Arges wrote:
> <snip>
> > +
> > +$(STACKTOOL_IN): FORCE
> > +	@$(MAKE) $(build)=stacktool
> > +
> > +$(STACKTOOL): $(STACKTOOL_IN)
> > +	@(test -d ../../kernel -a -d ../../tools -a -d ../stacktool && (( \
> > +	diff -I'^#include' arch/x86/insn/insn.c ../../arch/x86/lib/insn.c >/dev/null && \
> > +	diff -I'^#include' arch/x86/insn/inat.c ../../arch/x86/lib/inat.c >/dev/null && \
> > +	diff arch/x86/insn/x86-opcode-map.txt ../../arch/x86/lib/x86-opcode-map.txt >/dev/null && \
> > +	diff arch/x86/insn/gen-insn-attr-x86.awk ../../arch/x86/tools/gen-insn-attr-x86.awk >/dev/null && \
> > +	diff -I'^#include' arch/x86/insn/insn.h ../../arch/x86/include/asm/insn.h >/dev/null && \
> > +	diff -I'^#include' arch/x86/insn/inat.h ../../arch/x86/include/asm/inat.h >/dev/null && \
> > +	diff -I'^#include' arch/x86/insn/inat_types.h ../../arch/x86/include/asm/inat_types.h >/dev/null) \
> > +	|| echo "Warning: stacktool: x86 instruction decoder differs from kernel" >&2 )) || true
> > +	$(QUIET_LINK)$(CC) $(STACKTOOL_IN) $(LDFLAGS) -o $@
> > +
> > +clean:
> > +	$(call QUIET_CLEAN, stacktool) $(RM) $(STACKTOOL)
> > +	$(Q)find $(OUTPUT) -name '*.o' -delete -o -name '\.*.cmd' -delete -o -name '\.*.d' -delete
> > +	$(Q)$(RM) $(OUTPUT)arch/x86/insn/inat-tables.c
> > +
> > +FORCE:
> > +
> > +.PHONY: clean FORCE
> 
> Josh,
> 
> I'm getting the following error when the above makefile is called:
> Warning: stacktool: x86 instruction decoder differs from kernel

It's just a warning, not an error, right?  Just want to make sure it
didn't fail the build.  The files are in sync on tip/master.

> This was seen with your patches rebased on v4.3-rc2.
> 
> It is failing on this diff:
> diff arch/x86/insn/x86-opcode-map.txt ../../arch/x86/lib/x86-opcode-map.txt
> 
> And the output is as follows:
> 902,904d890
> < 3: xrstors
> < 4: xsavec
> < 5: xsaves
> 949,950c935,936
> < 6: XSAVEOPT | clwb (66) | mfence (11B)
> < 7: clflush | clflushopt (66) | sfence (11B) | pcommit (66),(11B)
> ---
> > 6: XSAVEOPT | mfence (11B)
> > 7: clflush | sfence (11B)
> 
> Why do these files essentially need to be duplicated? Would it be possible to
> point Make at the files that are already in ../../arch/x86/*?

They're duplicated because the "tools" dir is supposed to be source
independent from the rest of the kernel tree.

-- 
Josh
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