linux-kernel - Re: [PATCH v2] string: use __builtin

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Message-Id: <168548824525.1351231.6995242566921339574.b4-ty@chromium.org>
Date:   Tue, 30 May 2023 16:10:46 -0700
From:   Kees Cook <keescook@...omium.org>
To:     andy@...nel.org, Andrew Morton <akpm@...ux-foundation.org>,
        glider@...gle.com
Cc:     Kees Cook <keescook@...omium.org>, nathan@...nel.org,
        dvyukov@...gle.com, elver@...gle.com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, kasan-dev@...glegroups.com,
        ndesaulniers@...gle.com
Subject: Re: [PATCH v2] string: use __builtin_memcpy() in strlcpy/strlcat

On Tue, 30 May 2023 10:39:11 +0200, Alexander Potapenko wrote:
> lib/string.c is built with -ffreestanding, which prevents the compiler
> from replacing certain functions with calls to their library versions.
> 
> On the other hand, this also prevents Clang and GCC from instrumenting
> calls to memcpy() when building with KASAN, KCSAN or KMSAN:
>  - KASAN normally replaces memcpy() with __asan_memcpy() with the
>    additional cc-param,asan-kernel-mem-intrinsic-prefix=1;
>  - KCSAN and KMSAN replace memcpy() with __tsan_memcpy() and
>    __msan_memcpy() by default.
> 
> [...]

Applied to for-next/hardening, thanks!

[1/1] string: use __builtin_memcpy() in strlcpy/strlcat
      https://git.kernel.org/kees/c/cfe93c8c9a7a

-- 
Kees Cook