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

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Message-ID: <CAFP8O3L_RsaTMJvT7hmjD6ON49uob9Fb4mWg8ZUav_Y-FCgTMA@mail.gmail.com>
Date:   Wed, 17 May 2023 12:08:58 -0700
From:   Fangrui Song <maskray@...gle.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     ndesaulniers@...gle.com, masahiroy@...nel.org,
        linux-kbuild@...r.kernel.org, nathan@...nel.org,
        linux-hardening@...r.kernel.org, jpoimboe@...nel.org,
        llvm@...ts.linux.dev, mbenes@...e.cz, linux-kernel@...r.kernel.org,
        trix@...hat.com, peterz@...radead.org
Subject: Re: [PATCH] ubsan: remove cc-option test for UBSAN_TRAP

On Wed, May 17, 2023 at 12:02 PM Kees Cook <keescook@...omium.org> wrote:
>
> On Fri, 7 Apr 2023 14:54:06 -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.
> >
> >
>
> Applied to for-next/hardening, thanks!
>
> [1/1] ubsan: remove cc-option test for UBSAN_TRAP
>       https://git.kernel.org/kees/c/08e4044243a6
>
> --
> Kees Cook
>
>

For this -fsanitize-undefined-trap-on-error, I think we need a v2 patch that
tries -fsanitize-trap=all as well.

-fsanitize-undefined-trap-on-error has been deprecated in Clang for 8
years, and at some point we will remove the option.

GCC implements -fsanitize-trap=all later, but
-fsanitize-undefined-trap-on-error is documented as deprecated as
well.


-- 
宋方睿