linux-hardening - [PATCH 2/6] sancov: Split plugin build from plugin CFLAGS

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Date:   Tue,  3 May 2022 13:54:59 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Bill Wendling <morbo@...gle.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        linux-kbuild@...r.kernel.org, linux-hardening@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        David Howells <dhowells@...hat.com>,
        Jeff Layton <jlayton@...nel.org>, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: [PATCH 2/6] sancov: Split plugin build from plugin CFLAGS

When the sancov_plugin is enabled, it gets added to gcc-plugin-y which
is used to populate both GCC_PLUGIN (for building the plugin) and
GCC_PLUGINS_CFLAGS (for enabling and options). Instead of adding sancov
to both and then removing it from GCC_PLUGINS_CFLAGS, create a separate
list, gcc-plugin-external-y, which is only added to GCC_PLUGIN.

This will also be used by the coming randstruct build changes.

Cc: Masahiro Yamada <masahiroy@...nel.org>
Cc: linux-kbuild@...r.kernel.org
Cc: linux-hardening@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 scripts/Makefile.gcc-plugins | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/scripts/Makefile.gcc-plugins b/scripts/Makefile.gcc-plugins
index f67153b260c0..927c3dd57f84 100644
--- a/scripts/Makefile.gcc-plugins
+++ b/scripts/Makefile.gcc-plugins
@@ -8,8 +8,6 @@ ifdef CONFIG_GCC_PLUGIN_LATENT_ENTROPY
 endif
 export DISABLE_LATENT_ENTROPY_PLUGIN
 
-gcc-plugin-$(CONFIG_GCC_PLUGIN_SANCOV)		+= sancov_plugin.so
-
 gcc-plugin-$(CONFIG_GCC_PLUGIN_STRUCTLEAK)	+= structleak_plugin.so
 gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STRUCTLEAK_VERBOSE)	\
 		+= -fplugin-arg-structleak_plugin-verbose
@@ -53,13 +51,17 @@ export DISABLE_ARM_SSP_PER_TASK_PLUGIN
 # All the plugin CFLAGS are collected here in case a build target needs to
 # filter them out of the KBUILD_CFLAGS.
 GCC_PLUGINS_CFLAGS := $(strip $(addprefix -fplugin=$(objtree)/scripts/gcc-plugins/, $(gcc-plugin-y)) $(gcc-plugin-cflags-y))
-# The sancov_plugin.so is included via CFLAGS_KCOV, so it is removed here.
-GCC_PLUGINS_CFLAGS := $(filter-out %/sancov_plugin.so, $(GCC_PLUGINS_CFLAGS))
 export GCC_PLUGINS_CFLAGS
 
 # Add the flags to the build!
 KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
 
-# All enabled GCC plugins are collected here for building below.
-GCC_PLUGIN := $(gcc-plugin-y)
+# Some plugins are enabled outside of this Makefile, but they still need to
+# be included in GCC_PLUGIN so they can get built.
+gcc-plugin-external-$(CONFIG_GCC_PLUGIN_SANCOV)			\
+	+= sancov_plugin.so
+
+# All enabled GCC plugins are collected here for building in
+# scripts/gcc-scripts/Makefile.
+GCC_PLUGIN := $(gcc-plugin-y) $(gcc-plugin-external-y)
 export GCC_PLUGIN
-- 
2.32.0