wire up -fsanitize=local-init

GrapheneOS · Feb 14, 2018 · d00d115 · d00d115
1 parent db20436
commit d00d115
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diff --git a/Makefile b/Makefile
@@ -698,6 +698,9 @@ endif
 KBUILD_CFLAGS += $(stackp-flag)
 
 ifeq ($(cc-name),clang)
+ifdef CONFIG_LOCAL_SANITIZE
+KBUILD_CFLAGS   += -fsanitize=local-sanitize
+endif
 ifneq ($(CROSS_COMPILE),)
 CLANG_TARGET	:= --target=$(notdir $(CROSS_COMPILE:%-=%))
 GCC_TOOLCHAIN	:= $(realpath $(dir $(shell which $(LD)))/..)

diff --git a/init/Kconfig b/init/Kconfig
@@ -1052,6 +1052,12 @@ config CC_OPTIMIZE_FOR_SIZE
 
 endchoice
 
+config LOCAL_SANITIZE
+	bool "Zero uninitialized locals"
+	help
+	  Zero-fill uninitialized local variables, other than variable-length
+	  arrays. Requires compiler support.
+
 config SYSCTL
 	bool