linux-hardening - Re: [PATCH] ubsan: Restore dependency on ARCH_HAS

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Date: Wed, 15 May 2024 08:38:15 +0200
From: Marco Elver <elver@...gle.com>
To: Kees Cook <keescook@...omium.org>
Cc: Masahiro Yamada <masahiroy@...nel.org>, Andrey Konovalov <andreyknvl@...il.com>, 
	Andrey Ryabinin <ryabinin.a.a@...il.com>, kasan-dev@...glegroups.com, 
	linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ubsan: Restore dependency on ARCH_HAS_UBSAN

On Wed, 15 May 2024 at 01:38, Kees Cook <keescook@...omium.org> wrote:
>
> While removing CONFIG_UBSAN_SANITIZE_ALL, ARCH_HAS_UBSAN wasn't correctly
> depended on. Restore this, as we do not want to attempt UBSAN builds
> unless it's actually been tested on a given architecture.
>
> Reported-by: Masahiro Yamada <masahiroy@...nel.org>
> Closes: https://lore.kernel.org/all/20240514095427.541201-1-masahiroy@kernel.org
> Fixes: 918327e9b7ff ("ubsan: Remove CONFIG_UBSAN_SANITIZE_ALL")
> Signed-off-by: Kees Cook <keescook@...omium.org>

Reviewed-by: Marco Elver <elver@...gle.com>

> ---
> Cc: Marco Elver <elver@...gle.com>
> Cc: Andrey Konovalov <andreyknvl@...il.com>
> Cc: Andrey Ryabinin <ryabinin.a.a@...il.com>
> Cc: kasan-dev@...glegroups.com
> Cc: linux-hardening@...r.kernel.org
> ---
>  lib/Kconfig.ubsan | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/lib/Kconfig.ubsan b/lib/Kconfig.ubsan
> index e81e1ac4a919..bdda600f8dfb 100644
> --- a/lib/Kconfig.ubsan
> +++ b/lib/Kconfig.ubsan
> @@ -4,6 +4,7 @@ config ARCH_HAS_UBSAN
>
>  menuconfig UBSAN
>         bool "Undefined behaviour sanity checker"
> +       depends on ARCH_HAS_UBSAN
>         help
>           This option enables the Undefined Behaviour sanity checker.
>           Compile-time instrumentation is used to detect various undefined
> --
> 2.34.1
>