linux-kernel - Re: [PATCH] kcsan: Never set up watchpoints on NULL pointers

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Message-ID: <CANpmjNNyhPtb04np4bm6SgUyGfQaPt1RVb4ktjF3Uv=95NHxxg@mail.gmail.com>
Date:   Thu, 22 Oct 2020 13:47:30 +0200
From:   Marco Elver <elver@...gle.com>
To:     Marco Elver <elver@...gle.com>,
        "Paul E. McKenney" <paulmck@...nel.org>
Cc:     Mark Rutland <mark.rutland@....com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kcsan: Never set up watchpoints on NULL pointers

On Thu, 22 Oct 2020 at 13:30, Marco Elver <elver@...gle.com> wrote:
>
> Avoid setting up watchpoints on NULL pointers, as otherwise we would
> crash inside the KCSAN runtime (when checking for value changes) instead
> of the instrumented code.
>
> Because that may be confusing, skip any address less than PAGE_SIZE.
>
> Signed-off-by: Marco Elver <elver@...gle.com>
> ---

Please use the series at:
https://lkml.kernel.org/r/20201022114553.2440135-1-elver@google.com
which includes a prerequisite patch that was missing.

Thanks,
-- Marco