[PATCH v3 6/6] Enable KASan for arm

[Abbott Liu <liuwenliang@huawei.com>]

From: Andrey Ryabinin <a.ryabinin@samsung.com>

This patch enable kernel address sanitizer for arm.

Cc: Andrey Ryabinin <a.ryabinin@samsung.com>
Acked-by: Dmitry Vyukov <dvyukov@google.com>
Tested-by: Joel Stanley <joel@jms.id.au>
Tested-by: Florian Fainelli <f.fainelli@gmail.com>
Tested-by: Abbott Liu <liuwenliang@huawei.com>
Signed-off-by: Abbott Liu <liuwenliang@huawei.com>
---
 Documentation/dev-tools/kasan.rst | 2 +-
 arch/arm/Kconfig                  | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/Documentation/dev-tools/kasan.rst b/Documentation/dev-tools/kasan.rst
index f7a18f2..d92120d 100644
--- a/Documentation/dev-tools/kasan.rst
+++ b/Documentation/dev-tools/kasan.rst
@@ -12,7 +12,7 @@ KASAN uses compile-time instrumentation for checking every memory access,
 therefore you will need a GCC version 4.9.2 or later. GCC 5.0 or later is
 required for detection of out-of-bounds accesses to stack or global variables.
 
-Currently KASAN is supported only for the x86_64 and arm64 architectures.
+Currently KASAN is supported only for the x86_64, arm64 and arm architectures.
 
 Usage
 -----
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 7e3d535..ac2287b 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -49,6 +49,7 @@ config ARM
 	select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6
 	select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32 && MMU
 	select HAVE_ARCH_KGDB if !CPU_ENDIAN_BE32 && MMU
+	select HAVE_ARCH_KASAN if MMU
 	select HAVE_ARCH_MMAP_RND_BITS if MMU
 	select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT)
 	select HAVE_ARCH_THREAD_STRUCT_WHITELIST
-- 
2.9.0