linux-kernel - Re: [PATCH 4/4] kasan: add compiler support for clang

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Date:   Mon, 10 Jul 2017 13:34:24 +0300
From:   Andrey Ryabinin <aryabinin@...tuozzo.com>
To:     Greg Hackmann <ghackmann@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <mmarek@...e.com>
Cc:     linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com,
        linux-mm@...ck.org, linux-kbuild@...r.kernel.org,
        Matthias Kaehlcke <mka@...omium.org>,
        Michael Davidson <md@...gle.com>
Subject: Re: [PATCH 4/4] kasan: add compiler support for clang

On 07/07/2017 01:01 AM, Greg Hackmann wrote:
> 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@...gle.com>
> ---
>  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
> + */

 Enclosing */ should be on the same line for single-line comments.

> +#define KASAN_ABI_VERSION 5
> +
> +/* emulate gcc's __SANITIZE_ADDRESS__ flag
> + */

Ditto.

> +#if __has_feature(address_sanitizer)
> +#define __SANITIZE_ADDRESS__
> +#endif
>