The patch titled
Subject: kasan: add no_sanitize attribute for clang builds
has been added to the -mm tree. Its filename is
kasan-add-no_sanitize-attribute-for-clang-builds.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/kasan-add-no_sanitize-attribute-for-clang-builds.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/kasan-add-no_sanitize-attribute-for-clang-builds.patch
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------------------------------------------------------
From: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Subject: kasan: add no_sanitize attribute for clang builds
KASAN uses the __no_sanitize_address macro to disable instrumentation of
particular functions. Right now it's defined only for GCC build, which
causes false positives when clang is used.
This patch adds a definition for clang.
Note, that clang's revision 329612 or higher is required.
Link: http://lkml.kernel.org/r/4ad725cc903f8534f8c8a60f0daade5e3d674f8d.1523554166.git.andreyknvl@xxxxxxxxxx
Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: David Woodhouse <dwmw@xxxxxxxxxxxx>
Cc: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Lawrence <paullawrence@xxxxxxxxxx>
Cc: Sandipan Das <sandipan@xxxxxxxxxxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/compiler-clang.h | 5 +++++
1 file changed, 5 insertions(+)
diff -puN include/linux/compiler-clang.h~kasan-add-no_sanitize-attribute-for-clang-builds include/linux/compiler-clang.h
--- a/include/linux/compiler-clang.h~kasan-add-no_sanitize-attribute-for-clang-builds
+++ a/include/linux/compiler-clang.h
@@ -25,6 +25,11 @@
#define __SANITIZE_ADDRESS__
#endif
+#ifdef CONFIG_KASAN
+#undef __no_sanitize_address
+#define __no_sanitize_address __attribute__((no_sanitize("address")))
+#endif
+
/* Clang doesn't have a way to turn it off per-function, yet. */
#ifdef __noretpoline
#undef __noretpoline
_
Patches currently in -mm which might be from andreyknvl@xxxxxxxxxx are
kasan-add-no_sanitize-attribute-for-clang-builds.patch
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