linux-hardening - Re: [PATCH] ubsan: remove cc-option test for UBSAN

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Date:   Fri, 7 Apr 2023 14:58:24 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        linux-hardening@...r.kernel.org, Tom Rix <trix@...hat.com>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Miroslav Benes <mbenes@...e.cz>, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, linux-kbuild@...r.kernel.org
Subject: Re: [PATCH] ubsan: remove cc-option test for UBSAN_TRAP

On Fri, Apr 07, 2023 at 02:54:06PM -0700, Nick Desaulniers wrote:
> -fsanitize-undefined-trap-on-error has been supported since GCC 5.1 and
> Clang 3.2.  The minimum supported version of these according to
> Documentation/process/changes.rst is 5.1 and 11.0.0 respectively. Drop
> this cc-option check.
> 
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>

Reviewed-by: Nathan Chancellor <nathan@...nel.org>

As an aside, we should really consider having some standard format of
comment around cc-option checks so that we can easily remove them when
they become stale...

> ---
> Masahiro, Kees: get_maintainer.pl leaves much to be desired for this
> file. Can one of you please pick this up?
> 
>  lib/Kconfig.ubsan | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/lib/Kconfig.ubsan b/lib/Kconfig.ubsan
> index fd15230a703b..0e7ad0782399 100644
> --- a/lib/Kconfig.ubsan
> +++ b/lib/Kconfig.ubsan
> @@ -15,7 +15,6 @@ if UBSAN
>  config UBSAN_TRAP
>  	bool "On Sanitizer warnings, abort the running kernel code"
>  	depends on !COMPILE_TEST
> -	depends on $(cc-option, -fsanitize-undefined-trap-on-error)
>  	help
>  	  Building kernels with Sanitizer features enabled tends to grow
>  	  the kernel size by around 5%, due to adding all the debugging
> -- 
> 2.40.0.577.gac1e443424-goog
>