Date: Tue, 1 Mar 2016 18:14:00 +0100 From: Emese Revfy <re.emese@...il.com> To: linux-kbuild@...r.kernel.org Cc: pageexec@...email.hu, spender@...ecurity.net, kernel-hardening@...ts.openwall.com, mmarek@...e.com, keescook@...omium.org, linux@...musvillemoes.dk, fengguang.wu@...el.com Subject: [PATCH v4 0/3] Introduce GCC plugin infrastructure This patch set introduce the GCC plugin infrastructure with examples for testing and documentation. GCC plugins are loadable modules that provide extra features to the compiler. They are useful for runtime instrumentation and static analysis. The infrastructure supports all gcc versions from 4.5 to 6.0, building out-of-tree modules and building in a separate directory. Cross-compilation is supported too but currently only the x86 architecture enables plugins. This infrastructure was ported from grsecurity/PaX. It is a CII project supported by the Linux Foundation. Emese Revfy (3): GCC plugin infrastructure Add Cyclomatic complexity plugin Documentations of the GCC plugin infrastructre Changes from v3: * Fix some indentation related warnings (Suggested by checkpatch.pl) * Add maintainer entries * Don't run gcc_plugin.sh when the GCC_PLUGINS option is disabled or unsupported (Reported-by: Fengguang Wu <fengguang.wu@...el.com>) I found a kbuild bug (or feature?) related to this patch. When a config option is disabled then the symbol gets undefined only when you run make clean. The easiest way to reproduce it is with e.g., CC_STACKPROTECTOR_STRONG: * patch in warning here: diff --git a/Makefile b/Makefile index a1a7708..9e6961f 100644 --- a/Makefile +++ b/Makefile @@ -664,6 +664,7 @@ ifdef CONFIG_CC_STACKPROTECTOR_REGULAR else ifdef CONFIG_CC_STACKPROTECTOR_STRONG stackp-flag := -fstack-protector-strong + $(warning AAAAAAAA) ifeq ($(call cc-option, $(stackp-flag)),) $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \ -fstack-protector-strong not supported by compiler) * enable CC_STACKPROTECTOR_STRONG in menuconfig * run make and it prints out the "AAAAAAAA" * enable CC_STACKPROTECTOR_NONE in menuconfig * run make and it prints out the "AAAAAAAA" * run make clean, run make again and it doesn't print out the "AAAAAAAA" Changes from v2: * Fixed incorrectly encoded characters * Generate the GIMPLE, IPA, SIMPLE_IPA and RTL pass structures (Suggested-by: Rasmus Villemoes <linux@...musvillemoes.dk>) * Write plugin related warning messages to stderr instead of stdout (Suggested-by: Kees Cook <keescook@...omium.org>) * Mention the installation of the gcc plugin headers (Documentation) Changes from v1: * Move the gcc-plugins make target into a separate Makefile because there may be a lot of plugins (Suggested-by: Rasmus Villemoes) * Simplify the dependencies of the plugin related config option (Suggested-by: Kees Cook <keescook@...omium.org>) * Removed the unnecessary example plugin --- Documentation/dontdiff | 1 + Documentation/gcc-plugins.txt | 82 ++++ MAINTAINERS | 8 + Makefile | 41 +- arch/Kconfig | 24 + arch/x86/Kconfig | 1 + init/Makefile | 3 + scripts/Makefile.build | 2 +- scripts/Makefile.clean | 3 +- scripts/Makefile.gcc-plugins | 32 ++ scripts/Makefile.host | 69 ++- scripts/gcc-plugin.sh | 51 ++ scripts/link-vmlinux.sh | 2 +- scripts/package/builddeb | 1 + tools/gcc/Makefile | 19 + tools/gcc/cyc_complexity_plugin.c | 73 +++ tools/gcc/gcc-common.h | 803 +++++++++++++++++++++++++++++++ tools/gcc/gcc-generate-gimple-pass.h | 173 +++++++ tools/gcc/gcc-generate-ipa-pass.h | 287 +++++++++++ tools/gcc/gcc-generate-rtl-pass.h | 173 +++++++ tools/gcc/gcc-generate-simple_ipa-pass.h | 173 +++++++ 21 files changed, 2006 insertions(+), 15 deletions(-)
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