linux-kernel - Re: [PATCH v4 08/45] kmsan: mark noinstr as __no_sanitize

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Message-ID: <CANpmjNOb_aY5BrxKY=WzuDb7Y708XS1hSR0pJ8PKQi7Z8MDNCA@mail.gmail.com>
Date:   Tue, 12 Jul 2022 16:17:18 +0200
From:   Marco Elver <elver@...gle.com>
To:     Alexander Potapenko <glider@...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@...glegroups.com,
        linux-mm@...ck.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 08/45] kmsan: mark noinstr as __no_sanitize_memory

On Fri, 1 Jul 2022 at 16:23, Alexander Potapenko <glider@...gle.com> wrote:
>
> noinstr functions should never be instrumented, so make KMSAN skip them
> by applying the __no_sanitize_memory attribute.
>
> Signed-off-by: Alexander Potapenko <glider@...gle.com>

Reviewed-by: Marco Elver <elver@...gle.com>

> ---
> v2:
>  -- moved this patch earlier in the series per Mark Rutland's request
>
> Link: https://linux-review.googlesource.com/id/I3c9abe860b97b49bc0c8026918b17a50448dec0d
> ---
>  include/linux/compiler_types.h | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h
> index d08dfcb0ac687..fb5777e5228e7 100644
> --- a/include/linux/compiler_types.h
> +++ b/include/linux/compiler_types.h
> @@ -227,7 +227,8 @@ struct ftrace_likely_data {
>  /* Section for code which can't be instrumented at all */
>  #define noinstr                                                                \
>         noinline notrace __attribute((__section__(".noinstr.text")))    \
> -       __no_kcsan __no_sanitize_address __no_profile __no_sanitize_coverage
> +       __no_kcsan __no_sanitize_address __no_profile __no_sanitize_coverage \
> +       __no_sanitize_memory
>
>  #endif /* __KERNEL__ */
>
> --
> 2.37.0.rc0.161.g10f37bed90-goog
>