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From:   Fangrui Song <maskray@google.com>
Date:   Wed, 17 May 2023 12:09:35 -0700
Message-ID: <CAFP8O3JivZh+AAV7N90Nk7U2BHRNST6MRP0zHtfQ-Vj0m4+pDA@mail.gmail.com>
Subject: Re: [PATCH] ubsan: remove cc-option test for UBSAN_TRAP
To:     Kees Cook <keescook@chromium.org>
Cc:     ndesaulniers@google.com, masahiroy@kernel.org,
        linux-kbuild@vger.kernel.org, nathan@kernel.org,
        linux-hardening@vger.kernel.org, jpoimboe@kernel.org,
        llvm@lists.linux.dev, mbenes@suse.cz, linux-kernel@vger.kernel.org,
        trix@redhat.com, peterz@infradead.org
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On Wed, May 17, 2023 at 12:08=E2=80=AFPM Fangrui Song <maskray@google.com> =
wrote:
>
> On Wed, May 17, 2023 at 12:02=E2=80=AFPM Kees Cook <keescook@chromium.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 a=
nd
> > > Clang 3.2.  The minimum supported version of these according to
> > > Documentation/process/changes.rst is 5.1 and 11.0.0 respectively. Dro=
p
> > > 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 t=
hat
> tries -fsanitize-trap=3Dall as well.

Correction: -fsanitize-trap=3Dundefined

> -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=3Dall later, but
> -fsanitize-undefined-trap-on-error is documented as deprecated as
> well.