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From:   Alexander Potapenko <glider@google.com>
Date:   Wed, 3 Aug 2022 12:52:21 +0200
Message-ID: <CAG_fn=Xf_VTgYPk8Bnk2Kc9JCArnaRUO-kKFREh6rDpqC3t1eg@mail.gmail.com>
Subject: Re: [PATCH v4 33/45] x86: kmsan: disable instrumentation of
 unsupported code
To:     Marco Elver <elver@google.com>
Cc:     Alexander Viro <viro@zeniv.linux.org.uk>,
        Alexei Starovoitov <ast@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Andrey Konovalov <andreyknvl@google.com>,
        Andy Lutomirski <luto@kernel.org>,
        Arnd Bergmann <arnd@arndb.de>, Borislav Petkov <bp@alien8.de>,
        Christoph Hellwig <hch@lst.de>,
        Christoph Lameter <cl@linux.com>,
        David Rientjes <rientjes@google.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        Eric Dumazet <edumazet@google.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        Ilya Leoshkevich <iii@linux.ibm.com>,
        Ingo Molnar <mingo@redhat.com>, Jens Axboe <axboe@kernel.dk>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        Kees Cook <keescook@chromium.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Matthew Wilcox <willy@infradead.org>,
        "Michael S. Tsirkin" <mst@redhat.com>,
        Pekka Enberg <penberg@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Petr Mladek <pmladek@suse.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Vasily Gorbik <gor@linux.ibm.com>,
        Vegard Nossum <vegard.nossum@oracle.com>,
        Vlastimil Babka <vbabka@suse.cz>,
        kasan-dev <kasan-dev@googlegroups.com>,
        Linux Memory Management List <linux-mm@kvack.org>,
        Linux-Arch <linux-arch@vger.kernel.org>,
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On Tue, Jul 12, 2022 at 3:44 PM Marco Elver <elver@google.com> wrote:
>
> On Fri, 1 Jul 2022 at 16:24, 'Alexander Potapenko' via kasan-dev
> <kasan-dev@googlegroups.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-$(CONFIG_POLYNOMIAL) +=3D polynomial.o
> >  CFLAGS_stackdepot.o +=3D -fno-builtin
> >  obj-$(CONFIG_STACKDEPOT) +=3D stackdepot.o
> >  KASAN_SANITIZE_stackdepot.o :=3D n
> > +# In particular, instrumenting stackdepot.c with KMSAN will result in =
infinite
> > +# recursion.
> >  KMSAN_SANITIZE_stackdepot.o :=3D n
> >  KCOV_INSTRUMENT_stackdepot.o :=3D n
>
> This is generic code and not x86, should it have been in the earlier patc=
h?
Ack.


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Alexander Potapenko
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