linux-hardening - Re: [PATCH 5/5] Makefile: Enable -Wzero-length-bounds

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Message-ID: <CAKwvOd=bcs5W6eEDXGn5ROR2EuMiSp_2e6sLFxak=KK6yLWcvA@mail.gmail.com>
Date:   Wed, 25 Aug 2021 14:17:18 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Masahiro Yamada <masahiroy@...nel.org>,
        linux-kbuild@...r.kernel.org, clang-built-linux@...glegroups.com,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH 5/5] Makefile: Enable -Wzero-length-bounds

On Wed, Aug 18, 2021 at 1:11 AM Kees Cook <keescook@...omium.org> wrote:
>
> With all known internal zero-length accesses fixed, it is possible to
> enable -Wzero-length-bounds globally. Since this is included by default
> in -Warray-bounds, we just need to stop disabling it.
>
> Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Masahiro Yamada <masahiroy@...nel.org>
> Cc: linux-kbuild@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

> ---
>  Makefile | 1 -
>  1 file changed, 1 deletion(-)
>
> diff --git a/Makefile b/Makefile
> index af22b83cede7..3b6fb740584e 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -1071,7 +1071,6 @@ KBUILD_CFLAGS += -Wno-pointer-sign
>  KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
>
>  # We'll want to enable this eventually, but it's not going away for 5.7 at least
> -KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
>  KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
>
>  # Another good warning that we'll want to enable eventually
> --

-- 
Thanks,
~Nick Desaulniers