mm/kasan: Add MM_KASAN_ALL option

so the user could disable the full image instrumentation,
but enable the instrumentation by files or directories.

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

arch/arm/src/arm/Toolchain.defs

@@ -79,7 +79,7 @@ ifeq ($(CONFIG_ARCH_COVERAGE),y)
   ARCHOPTIMIZATION += -fprofile-generate -ftest-coverage
 endif
 
-ifeq ($(CONFIG_MM_KASAN),y)
+ifeq ($(CONFIG_MM_KASAN_ALL),y)
   ARCHOPTIMIZATION += -fsanitize=kernel-address
 endif
 

arch/arm/src/armv6-m/Toolchain.defs

@@ -165,7 +165,7 @@ endif
 
 # Architecture flags
 
-ifeq ($(CONFIG_MM_KASAN),y)
+ifeq ($(CONFIG_MM_KASAN_ALL),y)
   ARCHOPTIMIZATION += -fsanitize=kernel-address
 endif
 

arch/arm/src/armv7-a/Toolchain.defs

@@ -96,7 +96,7 @@ else
   ARCHCPUFLAGS += -mfloat-abi=soft
 endif
 
-ifeq ($(CONFIG_MM_KASAN),y)
+ifeq ($(CONFIG_MM_KASAN_ALL),y)
   ARCHOPTIMIZATION += -fsanitize=kernel-address
 endif
 

arch/arm/src/armv7-m/Toolchain.defs

@@ -179,7 +179,7 @@ else
 endif
 endif
 
-ifeq ($(CONFIG_MM_KASAN),y)
+ifeq ($(CONFIG_MM_KASAN_ALL),y)
   ARCHOPTIMIZATION += -fsanitize=kernel-address
 endif
 

arch/arm/src/armv7-r/Toolchain.defs

@@ -96,7 +96,7 @@ ifeq ($(CONFIG_ENDIAN_BIG),y)
   ARCHCPUFLAGS += -mbig-endian
 endif
 
-ifeq ($(CONFIG_MM_KASAN),y)
+ifeq ($(CONFIG_MM_KASAN_ALL),y)
   ARCHOPTIMIZATION += -fsanitize=kernel-address
 endif
 

arch/arm/src/armv8-m/Toolchain.defs

@@ -188,7 +188,7 @@ else
 endif
 endif
 
-ifeq ($(CONFIG_MM_KASAN),y)
+ifeq ($(CONFIG_MM_KASAN_ALL),y)
   ARCHOPTIMIZATION += -fsanitize=kernel-address
 endif
 

arch/arm/src/tlsr82/Toolchain.defs

@@ -140,7 +140,7 @@ endif
 
 # Architecture flags
 
-ifeq ($(CONFIG_MM_KASAN),y)
+ifeq ($(CONFIG_MM_KASAN_ALL),y)
   ARCHOPTIMIZATION += -fsanitize=kernel-address
 endif
 

arch/risc-v/src/common/Toolchain.defs

@@ -162,7 +162,7 @@ ifeq ($(CONFIG_RISCV_TOOLCHAIN),GNU_RVG)
 
 endif
 
-ifeq ($(CONFIG_MM_KASAN),y)
+ifeq ($(CONFIG_MM_KASAN_ALL),y)
   ARCHOPTIMIZATION += -fsanitize=kernel-address
 endif
 

arch/xtensa/src/lx6/Toolchain.defs

@@ -43,7 +43,7 @@ endif
 
 ARCHCPUFLAGS = -mlongcalls
 
-ifeq ($(CONFIG_MM_KASAN),y)
+ifeq ($(CONFIG_MM_KASAN_ALL),y)
   ARCHOPTIMIZATION += -fsanitize=kernel-address
 endif
 

arch/xtensa/src/lx7/Toolchain.defs

@@ -43,7 +43,7 @@ endif
 
 ARCHCPUFLAGS = -mlongcalls
 
-ifeq ($(CONFIG_MM_KASAN),y)
+ifeq ($(CONFIG_MM_KASAN_ALL),y)
   ARCHOPTIMIZATION += -fsanitize=kernel-address
 endif
 

boards/sim/sim/sim/scripts/Make.defs

@@ -73,7 +73,7 @@ endif
 
 ifeq ($(CONFIG_SIM_ASAN),y)
   ARCHOPTIMIZATION += -fsanitize=address
-else ifeq ($(CONFIG_MM_KASAN),y)
+else ifeq ($(CONFIG_MM_KASAN_ALL),y)
   ARCHOPTIMIZATION += -fsanitize=kernel-address
 endif
 

mm/Kconfig

@@ -191,6 +191,17 @@ config MM_KASAN
 		bugs in native code. After turn on this option, Please
 		add -fsanitize=kernel-address to CFLAGS/CXXFLAGS too.
 
+config MM_KASAN_ALL
+	bool "Enable KASan for the entire image"
+	depends on MM_KASAN
+	default y
+	---help---
+		This option activates address sanitizer for the entire image.
+		If you don't enable this option, you have to explicitly specify
+		"-fsanitize=kernel-address" for the files/directories you want
+		to check. Enabling this option will get image size increased
+		and performance decreased significantly.
+
 config MM_UBSAN
 	bool "Undefined Behavior Sanitizer"
 	default n