linux-kernel - RE: KCSAN Support on ARM64 Kernel

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Date:   Mon, 14 Oct 2019 14:59:58 +0530
From:   <sgrover@...eaurora.org>
To:     "'Marco Elver'" <elver@...gle.com>,
        "'Dmitry Vyukov'" <dvyukov@...gle.com>
Cc:     "'kasan-dev'" <kasan-dev@...glegroups.com>,
        "'LKML'" <linux-kernel@...r.kernel.org>,
        "'Paul E. McKenney'" <paulmck@...ux.ibm.com>,
        "'Will Deacon'" <willdeacon@...gle.com>,
        "'Andrea Parri'" <parri.andrea@...il.com>,
        "'Alan Stern'" <stern@...land.harvard.edu>,
        "'Mark Rutland'" <mark.rutland@....com>
Subject: RE: KCSAN Support on ARM64 Kernel

Hi Marco,

When can we expect upstream of KCSAN on kernel mainline. Any timeline?

Regards,
Sachin Grover

-----Original Message-----
From: Marco Elver <elver@...gle.com> 
Sent: Monday, 14 October, 2019 2:40 PM
To: Dmitry Vyukov <dvyukov@...gle.com>
Cc: sgrover@...eaurora.org; kasan-dev <kasan-dev@...glegroups.com>; LKML <linux-kernel@...r.kernel.org>; Paul E. McKenney <paulmck@...ux.ibm.com>; Will Deacon <willdeacon@...gle.com>; Andrea Parri <parri.andrea@...il.com>; Alan Stern <stern@...land.harvard.edu>; Mark Rutland <mark.rutland@....com>
Subject: Re: KCSAN Support on ARM64 Kernel

On Mon, 14 Oct 2019 at 10:40, Dmitry Vyukov <dvyukov@...gle.com> wrote:
>
> On Mon, Oct 14, 2019 at 7:11 AM <sgrover@...eaurora.org> wrote:
> >
> > Hi Dmitry,
> >
> > I am from Qualcomm Linux Security Team, just going through KCSAN and found that there was a thread for arm64 support (https://lkml.org/lkml/2019/9/20/804).
> >
> > Can you please tell me if KCSAN is supported on ARM64 now? Can I just rebase the KCSAN branch on top of our let’s say android mainline kernel, enable the config and run syzkaller on that for finding race conditions?
> >
> > It would be very helpful if you reply, we want to setup this for finding issues on our proprietary modules that are not part of kernel mainline.
> >
> > Regards,
> >
> > Sachin Grover
>
> +more people re KCSAN on ARM64

KCSAN does not yet have ARM64 support. Once it's upstream, I would expect that Mark's patches (from repo linked in LKML thread) will just cleanly apply to enable ARM64 support.

Thanks,
-- Marco