[PATCH 4/4] kasan: add compiler support for clang

[Greg Hackmann]

For now we can hard-code ASAN ABI level 5, since historical clang builds
can't build the kernel anyway.  We also need to emulate gcc's
__SANITIZE_ADDRESS__ flag, or memset() calls won't be instrumented.

Signed-off-by: Greg Hackmann <ghackmann@xxxxxxxxxx>
---
 include/linux/compiler-clang.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/linux/compiler-clang.h b/include/linux/compiler-clang.h
index d614c5ea1b5e..8153f793b22a 100644
--- a/include/linux/compiler-clang.h
+++ b/include/linux/compiler-clang.h
@@ -23,3 +23,13 @@
  */
 #undef inline
 #define inline inline __attribute__((unused)) notrace
+
+/* all clang versions usable with the kernel support KASAN ABI version 5
+ */
+#define KASAN_ABI_VERSION 5
+
+/* emulate gcc's __SANITIZE_ADDRESS__ flag
+ */
+#if __has_feature(address_sanitizer)
+#define __SANITIZE_ADDRESS__
+#endif
-- 
2.13.2.725.g09c95d1e9-goog