Re: [PATCH v13 05/25] kasan: add CONFIG_KASAN_GENERIC and CONFIG_KASAN_SW_TAGS

[Luc Van Oostenryck]

On Thu, Dec 06, 2018 at 01:24:23PM +0100, Andrey Konovalov wrote:
> diff --git a/include/linux/compiler-clang.h b/include/linux/compiler-clang.h
> index 3e7dafb3ea80..39f668d5066b 100644
> --- a/include/linux/compiler-clang.h
> +++ b/include/linux/compiler-clang.h
> @@ -16,9 +16,13 @@
>  /* all clang versions usable with the kernel support KASAN ABI version 5 */
>  #define KASAN_ABI_VERSION 5
>  
> +#if __has_feature(address_sanitizer) || __has_feature(hwaddress_sanitizer)
>  /* emulate gcc's __SANITIZE_ADDRESS__ flag */
> -#if __has_feature(address_sanitizer)
>  #define __SANITIZE_ADDRESS__
> +#define __no_sanitize_address \
> +		__attribute__((no_sanitize("address", "hwaddress")))
> +#else
> +#define __no_sanitize_address
>  #endif
>  
>  /*
> diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
> index 2010493e1040..5776da43da97 100644
> --- a/include/linux/compiler-gcc.h
> +++ b/include/linux/compiler-gcc.h
> @@ -143,6 +143,12 @@
>  #define KASAN_ABI_VERSION 3
>  #endif
>  
> +#if __has_attribute(__no_sanitize_address__)
> +#define __no_sanitize_address __attribute__((no_sanitize_address))
> +#else
> +#define __no_sanitize_address
> +#endif

Not really important but it's the name with leading and trailing
underscores that is tested with __has_attribute() but then it's
the naked 'no_sanitize_address' that is used in the attribute.

-- Luc