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gcc-plugins/stackleak: Provide verbose mode

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In order to compare instrumentation between builds, make the verbose
mode of the plugin available during the build. This is rarely needed
(behind EXPERT) and very noisy (disabled for COMPILE_TEST).

Cc: Alexander Popov <alex.popov@linux.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Kees Cook 2022-02-06 09:20:08 -08:00
parent 26291c54e1
commit f154066b61
2 changed files with 12 additions and 0 deletions
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2
scripts/Makefile.gcc-plugins
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@ -37,6 +37,8 @@ gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STACKLEAK) \
+= -fplugin-arg-stackleak_plugin-track-min-size=$(CONFIG_STACKLEAK_TRACK_MIN_SIZE)
gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STACKLEAK) \
+= -fplugin-arg-stackleak_plugin-arch=$(SRCARCH)
gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STACKLEAK_VERBOSE) \
+= -fplugin-arg-stackleak_plugin-verbose
ifdef CONFIG_GCC_PLUGIN_STACKLEAK
DISABLE_STACKLEAK_PLUGIN += -fplugin-arg-stackleak_plugin-disable
endif

10
security/Kconfig.hardening
View File

@ -174,6 +174,16 @@ config GCC_PLUGIN_STACKLEAK
* https://grsecurity.net/
* https://pax.grsecurity.net/
config GCC_PLUGIN_STACKLEAK_VERBOSE
bool "Report stack depth analysis instrumentation" if EXPERT
depends on GCC_PLUGIN_STACKLEAK
depends on !COMPILE_TEST # too noisy
help
This option will cause a warning to be printed each time the
stackleak plugin finds a function it thinks needs to be
instrumented. This is useful for comparing coverage between
builds.
config STACKLEAK_TRACK_MIN_SIZE
int "Minimum stack frame size of functions tracked by STACKLEAK"
default 100