linux-kernel - Re: [PATCH v4 33/45] x86: kmsan: disable instrumentation of unsupported code

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Message-ID: <CAG_fn=Xf_VTgYPk8Bnk2Kc9JCArnaRUO-kKFREh6rDpqC3t1eg@mail.gmail.com>
Date:   Wed, 3 Aug 2022 12:52:21 +0200
From:   Alexander Potapenko <glider@...gle.com>
To:     Marco Elver <elver@...gle.com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        Christoph Hellwig <hch@....de>,
        Christoph Lameter <cl@...ux.com>,
        David Rientjes <rientjes@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Ilya Leoshkevich <iii@...ux.ibm.com>,
        Ingo Molnar <mingo@...hat.com>, Jens Axboe <axboe@...nel.dk>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Kees Cook <keescook@...omium.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthew Wilcox <willy@...radead.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Pekka Enberg <penberg@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Vegard Nossum <vegard.nossum@...cle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Linux-Arch <linux-arch@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 33/45] x86: kmsan: disable instrumentation of
 unsupported code

On Tue, Jul 12, 2022 at 3:44 PM Marco Elver <elver@...gle.com> wrote:
>
> On Fri, 1 Jul 2022 at 16:24, 'Alexander Potapenko' via kasan-dev
> <kasan-dev@...glegroups.com> wrote:
> [...]
> > ---
> >  arch/x86/boot/Makefile            | 1 +
> >  arch/x86/boot/compressed/Makefile | 1 +
> >  arch/x86/entry/vdso/Makefile      | 3 +++
> >  arch/x86/kernel/Makefile          | 2 ++
> >  arch/x86/kernel/cpu/Makefile      | 1 +
> >  arch/x86/mm/Makefile              | 2 ++
> >  arch/x86/realmode/rm/Makefile     | 1 +
> >  lib/Makefile                      | 2 ++
> [...]
> > --- a/lib/Makefile
> > +++ b/lib/Makefile
> > @@ -272,6 +272,8 @@ obj-$(CONFIG_POLYNOMIAL) += polynomial.o
> >  CFLAGS_stackdepot.o += -fno-builtin
> >  obj-$(CONFIG_STACKDEPOT) += stackdepot.o
> >  KASAN_SANITIZE_stackdepot.o := n
> > +# In particular, instrumenting stackdepot.c with KMSAN will result in infinite
> > +# recursion.
> >  KMSAN_SANITIZE_stackdepot.o := n
> >  KCOV_INSTRUMENT_stackdepot.o := n
>
> This is generic code and not x86, should it have been in the earlier patch?
Ack.


-- 
Alexander Potapenko
Software Engineer

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