In order to make stack-protector failures warn instead of unconditionally
breaking the build, this moves the compiler output sanity-check earlier,
and sets a flag for later testing. Future patches can choose to warn or
fail, depending on the flag value.
Cc: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: linux-kbuild@xxxxxxxxxxxxxxx
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
---
Makefile | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/Makefile b/Makefile
index cf007a31d575..caa3f7e6f524 100644
--- a/Makefile
+++ b/Makefile
@@ -692,6 +692,12 @@ endif
ifdef CONFIG_CC_STACKPROTECTOR
stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
stackp-check := $(wildcard $(stackp-path))
+ # If the wildcard test matches a test script, run it to check functionality.
+ ifdef stackp-check
+ ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
+ stackp-broken := y
+ endif
+ endif
endif
KBUILD_CFLAGS += $(stackp-flag)
@@ -1087,11 +1093,9 @@ ifdef stackp-name
endif
endif
# Make sure compiler does not have buggy stack-protector support.
-ifdef stackp-check
- ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
+ifdef stackp-broken
@echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
$(stackp-flag) available but compiler is broken >&2 && exit 1
- endif
endif
@:
--
2.7.4
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