Date: Wed, 18 May 2016 18:51:10 +1000 From: Andrew Donnellan <andrew.donnellan@....ibm.com> To: kernel-hardening@...ts.openwall.com, linux-kbuild@...r.kernel.org Cc: pageexec@...email.hu, spender@...ecurity.net, mmarek@...e.com, keescook@...omium.org, linux@...musvillemoes.dk, fengguang.wu@...el.com, dvyukov@...gle.com, linux-kernel@...r.kernel.org, david.brown@...aro.org, yamada.masahiro@...ionext.com, linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>, Michael Ellerman <mpe@...erman.id.au>, Daniel Axtens <dja@...ens.net> Subject: Re: [PATCH v8 2/4] GCC plugin infrastructure On 13/05/16 09:57, Emese Revfy wrote: > This patch allows to build the whole kernel with GCC plugins. It was ported from > grsecurity/PaX. The infrastructure supports building out-of-tree modules and > building in a separate directory. Cross-compilation is supported too. > Currently the x86, arm, arm64 and uml architectures enable plugins. > > The directory of the gcc plugins is scripts/gcc-plugins. You can use a file or a directory > there. The plugins compile with these options: > * -fno-rtti: gcc is compiled with this option so the plugins must use it too > * -fno-exceptions: this is inherited from gcc too > * -fasynchronous-unwind-tables: this is inherited from gcc too > * -ggdb: it is useful for debugging a plugin (better backtrace on internal > errors) > * -Wno-narrowing: to suppress warnings from gcc headers (ipa-utils.h) > * -Wno-unused-variable: to suppress warnings from gcc headers (gcc_version > variable, plugin-version.h) > > The infrastructure introduces a new Makefile target called gcc-plugins. It > supports all gcc versions from 4.5 to 6.0. The scripts/gcc-plugin.sh script > chooses the proper host compiler (gcc-4.7 can be built by either gcc or g++). > This script also checks the availability of the included headers in > scripts/gcc-plugins/gcc-common.h. > > The gcc-common.h header contains frequently included headers for GCC plugins > and it has a compatibility layer for the supported gcc versions. > > The gcc-generate-*-pass.h headers automatically generate the registration > structures for GIMPLE, SIMPLE_IPA, IPA and RTL passes. > > Note that 'make clean' keeps the *.so files (only the distclean or mrproper > targets clean all) because they are needed for out-of-tree modules. > > The arm and arm64 architectures were tested by David Brown <david.brown@...aro.org>. > > Signed-off-by: Emese Revfy <re.emese@...il.com> I've done some basic sanity testing on powerpc with the cyclomatic complexity plugin (with LE native + cross-compilers) and it seems to work with the patch below. Signed-off-by: Andrew Donnellan <andrew.donnellan@....ibm.com> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index a18a0dc..0cfed5b 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -97,6 +97,7 @@ config PPC select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL select HAVE_FUNCTION_TRACER select HAVE_FUNCTION_GRAPH_TRACER + select HAVE_GCC_PLUGINS select SYSCTL_EXCEPTION_TRACE select ARCH_WANT_OPTIONAL_GPIOLIB select VIRT_TO_BUS if !PPC64 -- Andrew Donnellan OzLabs, ADL Canberra andrew.donnellan@....ibm.com IBM Australia Limited
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