linux-kernel - Re: [kernel-hardening] [PATCH v1 0/2] Introduce the initify gcc plugin

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Message-ID: <20160629175222.GA8517@leverpostej>
Date:	Wed, 29 Jun 2016 18:52:27 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	Kees Cook <keescook@...omium.org>
Cc:	Emese Revfy <re.emese@...il.com>,
	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>,
	PaX Team <pageexec@...email.hu>,
	Brad Spengler <spender@...ecurity.net>,
	Michal Marek <mmarek@...e.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Masahiro Yamada <yamada.masahiro@...ionext.com>,
	linux-kbuild <linux-kbuild@...r.kernel.org>, minipli@...linux.so,
	Russell King <linux@...linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	David Brown <david.brown@...aro.org>,
	"benh@...nel.crashing.org" <benh@...nel.crashing.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	jlayton@...chiereds.net, Arnd Bergmann <arnd@...db.de>
Subject: Re: [kernel-hardening] [PATCH v1 0/2] Introduce the initify gcc
 plugin

On Wed, Jun 29, 2016 at 09:21:37AM +0100, Mark Rutland wrote:
> On Tue, Jun 28, 2016 at 01:46:04PM -0700, Kees Cook wrote:
> > On Tue, Jun 28, 2016 at 9:14 AM, Emese Revfy <re.emese@...il.com> wrote:
> > > On Tue, 28 Jun 2016 13:57:49 +0100
> > > Mark Rutland <mark.rutland@....com> wrote:
> > >
> > >> On Tue, Jun 28, 2016 at 01:34:07PM +0200, Emese Revfy wrote:
> > >> > This patch set is based on the "Add support for complex gcc plugins that
> > >> > don't fit in a single file" patch set (git/kees/linux.git#kspp HEAD:
> > >> > e5d4798b284cd192c8b).
> > >>
> > >> I was hoping to give this a spin on arm/arm64, but I couldn't find the
> > >> prerequisite branch/tag/commit in that tree:
> > >>
> > >> https://git.kernel.org/cgit/linux/kernel/git/kees/linux.git/commit/?id=e5d4798b284cd192c8b
> > >>
> > >> Where should I be looking?
> > >
> > > Sorry, this commit was disappear. You can apply these patches to this tree:
> > > https://github.com/ephox-gcc-plugins/gcc-plugins_linux-next.git (initify branch)
> > 
> > The linux-next tree should have what you need for the plugin support.
> > This is merging from my KSPP tree:
> > 
> > https://git.kernel.org/linux/kernel/git/kees/linux.git for-next/kspp
> 
> I didn't see the complex gcc plugins patch in that branch or linux-next,
> so I take it you mean a a base for applying the complex plugin patch and
> initify patches.
> 
> I'll try to give that a go shortly.

I tried to give this a go atop of kees's for-next/kspp branch, but this
doesn't seem to build. With the Linaro 15.08 AArch64 toolchain, I see:

[mark@...erpostej:~/src/linux]% uselinaro 15.08 make V=1 ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- 
set -e; : '  CHK     include/config/kernel.release'; mkdir -p include/config/;  echo "4.7.0-rc1$(/bin/bash ./scripts/setlocalversion .)" < include/config/auto.conf > include/config/kernel.release.tmp; if [ -r include/config/kernel.release ] && cmp -s include/config/kernel.release include/config/kernel.release.tmp; then rm -f include/config/kernel.release.tmp; else : '  UPD     include/config/kernel.release'; mv -f include/config/kernel.release.tmp include/config/kernel.release; fi
make -f ./scripts/Makefile.asm-generic \
                    src=asm obj=arch/arm64/include/generated/asm
make -f ./scripts/Makefile.asm-generic \
                    src=uapi/asm obj=arch/arm64/include/generated/uapi/asm
set -e; : '  CHK     include/generated/uapi/linux/version.h'; mkdir -p include/generated/uapi/linux/;   (echo \#define LINUX_VERSION_CODE 263936; echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) < Makefile > include/generated/uapi/linux/version.h.tmp; if [ -r include/generated/uapi/linux/version.h ] && cmp -s include/generated/uapi/linux/version.h include/generated/uapi/linux/version.h.tmp; then rm -f include/generated/uapi/linux/version.h.tmp; else : '  UPD     include/generated/uapi/linux/version.h'; mv -f include/generated/uapi/linux/version.h.tmp include/generated/uapi/linux/version.h; fi
rm -f include/linux/version.h
set -e; : '  CHK     include/generated/utsrelease.h'; mkdir -p include/generated/;      if [ `echo -n "4.7.0-rc1+" | wc -c ` -gt 64 ]; then echo '"4.7.0-rc1+" exceeds 64 characters' >&2; exit 1; fi; (echo \#define UTS_RELEASE \"4.7.0-rc1+\";) < include/config/kernel.release > include/generated/utsrelease.h.tmp; if [ -r include/generated/utsrelease.h ] && cmp -s include/generated/utsrelease.h include/generated/utsrelease.h.tmp; then rm -f include/generated/utsrelease.h.tmp; else : '  UPD     include/generated/utsrelease.h'; mv -f include/generated/utsrelease.h.tmp include/generated/utsrelease.h; fi
mkdir -p .tmp_versions ; rm -f .tmp_versions/*
test -e include/generated/autoksyms.h || \
            touch   include/generated/autoksyms.h
make -f ./scripts/Makefile.build obj=scripts/basic
(cat /dev/null; ) > scripts/basic/modules.order
rm -f .tmp_quiet_recordmcount
make -f ./scripts/Makefile.build obj=scripts/gcc-plugins
(cat /dev/null; ) > scripts/gcc-plugins/modules.order
  g++  -shared -o scripts/gcc-plugins/initify_plugin.so   
g++: fatal error: no input files
compilation terminated.
make[1]: *** [scripts/gcc-plugins/initify_plugin.so] Error 4
make: *** [gcc-plugins] Error 2

Any ideas?

Thanks,
Mark.