linux-kernel - Re: [PATCH v2 8/8] x86, kcsan: Enable KCSAN for x86

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Date:   Tue, 22 Oct 2019 15:02:37 +0200
From:   Marco Elver <elver@...gle.com>
To:     Mark Rutland <mark.rutland@....com>
Cc:     LKMM Maintainers -- Akira Yokosawa <akiyks@...il.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Alexander Potapenko <glider@...gle.com>,
        Andrea Parri <parri.andrea@...il.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Boqun Feng <boqun.feng@...il.com>,
        Borislav Petkov <bp@...en8.de>, Daniel Axtens <dja@...ens.net>,
        Daniel Lustig <dlustig@...dia.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        David Howells <dhowells@...hat.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Jade Alglave <j.alglave@....ac.uk>,
        Joel Fernandes <joel@...lfernandes.org>,
        Jonathan Corbet <corbet@....net>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Luc Maranget <luc.maranget@...ia.fr>,
        Nicholas Piggin <npiggin@...il.com>,
        "Paul E. McKenney" <paulmck@...ux.ibm.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>,
        kasan-dev <kasan-dev@...glegroups.com>,
        linux-arch <linux-arch@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        linux-efi@...r.kernel.org,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        "the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: [PATCH v2 8/8] x86, kcsan: Enable KCSAN for x86

On Tue, 22 Oct 2019 at 14:59, Mark Rutland <mark.rutland@....com> wrote:
>
> On Thu, Oct 17, 2019 at 04:13:05PM +0200, Marco Elver wrote:
> > This patch enables KCSAN for x86, with updates to build rules to not use
> > KCSAN for several incompatible compilation units.
> >
> > Signed-off-by: Marco Elver <elver@...gle.com>
> > ---
> > v2:
> > * Document build exceptions where no previous above comment explained
> >   why we cannot instrument.
> > ---
> >  arch/x86/Kconfig                      | 1 +
> >  arch/x86/boot/Makefile                | 2 ++
> >  arch/x86/boot/compressed/Makefile     | 2 ++
> >  arch/x86/entry/vdso/Makefile          | 3 +++
> >  arch/x86/include/asm/bitops.h         | 6 +++++-
> >  arch/x86/kernel/Makefile              | 7 +++++++
> >  arch/x86/kernel/cpu/Makefile          | 3 +++
> >  arch/x86/lib/Makefile                 | 4 ++++
> >  arch/x86/mm/Makefile                  | 3 +++
> >  arch/x86/purgatory/Makefile           | 2 ++
> >  arch/x86/realmode/Makefile            | 3 +++
> >  arch/x86/realmode/rm/Makefile         | 3 +++
> >  drivers/firmware/efi/libstub/Makefile | 2 ++
> >  13 files changed, 40 insertions(+), 1 deletion(-)
>
> > diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile
> > index 0460c7581220..693d0a94b118 100644
> > --- a/drivers/firmware/efi/libstub/Makefile
> > +++ b/drivers/firmware/efi/libstub/Makefile
> > @@ -31,7 +31,9 @@ KBUILD_CFLAGS                       := $(cflags-y) -DDISABLE_BRANCH_PROFILING \
> >                                  -D__DISABLE_EXPORTS
> >
> >  GCOV_PROFILE                 := n
> > +# Sanitizer runtimes are unavailable and cannot be linked here.
> >  KASAN_SANITIZE                       := n
> > +KCSAN_SANITIZE                       := n
> >  UBSAN_SANITIZE                       := n
> >  OBJECT_FILES_NON_STANDARD    := y
>
> Not a big deal, but it might make sense to move the EFI stub exception
> to patch 3 since it isn't x86 specific (and will also apply for arm64).

Thanks for spotting, moved for v3.

-- Marco

> Otherwise this looks good to me.
>
> Thanks,
> Mark.