4.9-stable review patch. If anyone has any objections, please let me know.
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From: Andrey Konovalov andreyknvl@google.com
commit 12c8f25a016dff69ee284aa3338bebfd2cfcba33 upstream.
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.
[andreyknvl@google.com: remove redundant #ifdef CONFIG_KASAN check] Link: http://lkml.kernel.org/r/c79aa31a2a2790f6131ed607c58b0dd45dd62a6c.1523967959... Link: http://lkml.kernel.org/r/4ad725cc903f8534f8c8a60f0daade5e3d674f8d.1523554166... Signed-off-by: Andrey Konovalov andreyknvl@google.com Acked-by: Andrey Ryabinin aryabinin@virtuozzo.com Cc: Alexander Potapenko glider@google.com Cc: Dmitry Vyukov dvyukov@google.com Cc: David Rientjes rientjes@google.com Cc: Thomas Gleixner tglx@linutronix.de Cc: Ingo Molnar mingo@kernel.org Cc: David Woodhouse dwmw@amazon.co.uk Cc: Andrey Konovalov andreyknvl@google.com Cc: Will Deacon will.deacon@arm.com Cc: Greg Kroah-Hartman gregkh@linuxfoundation.org Cc: Paul Lawrence paullawrence@google.com Cc: Sandipan Das sandipan@linux.vnet.ibm.com Cc: Kees Cook keescook@chromium.org Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Cc: Sodagudi Prasad psodagud@codeaurora.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- include/linux/compiler-clang.h | 3 +++ 1 file changed, 3 insertions(+)
--- a/include/linux/compiler-clang.h +++ b/include/linux/compiler-clang.h @@ -16,6 +16,9 @@ */ #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
+#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