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From: Andrey Konovalov <andreyknvl@google.com>
To: Andrey Ryabinin <aryabinin@virtuozzo.com>,
	Alexander Potapenko <glider@google.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	David Rientjes <rientjes@google.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@kernel.org>,
	David Woodhouse <dwmw@amazon.co.uk>,
	Andrey Konovalov <andreyknvl@google.com>,
	Will Deacon <will.deacon@arm.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Paul Lawrence <paullawrence@google.com>,
	Sandipan Das <sandipan@linux.vnet.ibm.com>,
	Kees Cook <keescook@chromium.org>,
	linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com,
	linux-mm@kvack.org
Cc: Kostya Serebryany <kcc@google.com>
Subject: [PATCH v2] kasan: add no_sanitize attribute for clang builds
Date: Tue, 17 Apr 2018 14:26:47 +0200
Message-ID: <c79aa31a2a2790f6131ed607c58b0dd45dd62a6c.1523967959.git.andreyknvl@google.com> (raw)

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.

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
---

Changes since v1:
- Removed redundant #ifdef CONFIG_KASAN check.

 include/linux/compiler-clang.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/compiler-clang.h b/include/linux/compiler-clang.h
index ceb96ecab96e..7d98e263e048 100644
--- a/include/linux/compiler-clang.h
+++ b/include/linux/compiler-clang.h
@@ -25,6 +25,9 @@
 #define __SANITIZE_ADDRESS__
 #endif
 
+#undef __no_sanitize_address
+#define __no_sanitize_address __attribute__((no_sanitize("address")))
+
 /* Clang doesn't have a way to turn it off per-function, yet. */
 #ifdef __noretpoline
 #undef __noretpoline
-- 
2.17.0.484.g0c8726318c-goog

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