linux-kernel - Re: [PATCH 1/3] kcov: support comparison operands collection

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Date:   Thu, 31 Aug 2017 10:31:47 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Victor Chibotaru <tchibo@...gle.com>,
        Alexander Popov <alex.popov@...ux.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Kees Cook <keescook@...omium.org>,
        Vegard Nossum <vegard.nossum@...cle.com>,
        Quentin Casasnovas <quentin.casasnovas@...cle.com>,
        syzkaller <syzkaller@...glegroups.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] kcov: support comparison operands collection

On Wed, Aug 30, 2017 at 09:08:43PM +0200, Dmitry Vyukov wrote:
> On Wed, Aug 30, 2017 at 8:23 PM, Mark Rutland <mark.rutland@....com> wrote:
> > On Wed, Aug 30, 2017 at 06:23:29PM +0200, Dmitry Vyukov wrote:
> >> From: Victor Chibotaru <tchibo@...gle.com>
> >>
> >> Enables kcov to collect comparison operands from instrumented code.
> >> This is done by using Clang's -fsanitize=trace-cmp instrumentation
> >> (currently not available for GCC).

> >> Clang instrumentation:
> >> https://clang.llvm.org/docs/SanitizerCoverage.html#tracing-data-flow
> >
> > How stable is this?
> >
> > The comment at the end says "This interface is a subject to change."
> 
> The intention is that this is not subject to change anymore (since we
> are using it in kernel).
> I've mailed change to docs: https://reviews.llvm.org/D37303

Ok; thanks for confirming.

> FWIW, there is patch in flight that adds this instrumentation to gcc:
> https://groups.google.com/forum/#!topic/syzkaller/CSLynn6nI-A
> It seems to be stalled on review phase, though.

Let's hope it gets unblocked soon. :)

Thanks,
Mark.