From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e23smtp07.au.ibm.com (e23smtp07.au.ibm.com [202.81.31.140]) (using TLSv1.2 with cipher CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3r8nzx4MPHzDqCJ for ; Wed, 18 May 2016 18:53:48 +1000 (AEST) Received: from localhost by e23smtp07.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 18 May 2016 18:53:45 +1000 Received: from d23relay07.au.ibm.com (d23relay07.au.ibm.com [9.190.26.37]) by d23dlp02.au.ibm.com (Postfix) with ESMTP id 14ECB2BB0097 for ; Wed, 18 May 2016 18:53:18 +1000 (EST) Received: from d23av02.au.ibm.com (d23av02.au.ibm.com [9.190.235.138]) by d23relay07.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u4I8r4eE4588008 for ; Wed, 18 May 2016 18:53:12 +1000 Received: from d23av02.au.ibm.com (localhost [127.0.0.1]) by d23av02.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id u4I8qPnK025021 for ; Wed, 18 May 2016 18:52:26 +1000 Subject: Re: [kernel-hardening] [PATCH v8 2/4] GCC plugin infrastructure To: kernel-hardening@lists.openwall.com, linux-kbuild@vger.kernel.org References: <20160513015456.01415979f20a68eb7d2d9290@gmail.com> <20160513015725.30223ee16a2a3860b4392b90@gmail.com> Cc: pageexec@freemail.hu, spender@grsecurity.net, mmarek@suse.com, keescook@chromium.org, linux@rasmusvillemoes.dk, fengguang.wu@intel.com, dvyukov@google.com, linux-kernel@vger.kernel.org, david.brown@linaro.org, yamada.masahiro@socionext.com, linuxppc-dev , Michael Ellerman , Daniel Axtens From: Andrew Donnellan Message-ID: <573C2CFE.8060305@au1.ibm.com> Date: Wed, 18 May 2016 18:51:10 +1000 MIME-Version: 1.0 In-Reply-To: <20160513015725.30223ee16a2a3860b4392b90@gmail.com> Content-Type: text/plain; charset=windows-1252; format=flowed List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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 . > > Signed-off-by: Emese Revfy 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 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@au1.ibm.com IBM Australia Limited