linux-kernel - RE: perf: fuzzer KASAN slab-out-of-bounds in snb_uncore_imc_event

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Date:   Tue, 15 Nov 2016 18:18:02 +0000
From:   "Liang, Kan" <kan.liang@...el.com>
To:     Vince Weaver <vincent.weaver@...ne.edu>
CC:     Peter Zijlstra <peterz@...radead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        "Arnaldo Carvalho de Melo" <acme@...nel.org>,
        "davej@...emonkey.org.uk" <davej@...emonkey.org.uk>,
        "dvyukov@...gle.com" <dvyukov@...gle.com>,
        Stephane Eranian <eranian@...il.com>
Subject: RE: perf: fuzzer KASAN slab-out-of-bounds in
 snb_uncore_imc_event_del



> -----Original Message-----
> From: Vince Weaver [mailto:vincent.weaver@...ne.edu]
> Sent: Tuesday, November 15, 2016 12:39 PM
> To: Liang, Kan <kan.liang@...el.com>
> Cc: Peter Zijlstra <peterz@...radead.org>; Vince Weaver
> <vincent.weaver@...ne.edu>; linux-kernel@...r.kernel.org; Ingo Molnar
> <mingo@...hat.com>; Arnaldo Carvalho de Melo <acme@...nel.org>;
> davej@...emonkey.org.uk; dvyukov@...gle.com; Stephane Eranian
> <eranian@...il.com>
> Subject: RE: perf: fuzzer KASAN slab-out-of-bounds in
> snb_uncore_imc_event_del
> 
> On Tue, 15 Nov 2016, Liang, Kan wrote:
> 
> > For client IMC, there is no generic counters.
> > Current implementation defines its own fixed free running counters.
> > event_list and n_events are unused.
> > I think we can just remove them.
> >
> > Vince, could you please try the patch as below?
> >
> 
> With this patch I have not been able to trigger the imc/uncore issue.
> 
> Or at least I used to be able to trigger it within 5 minutes, now I go longer
> (maybe 10 minutes) before hitting an unrelated issue.
> 

Thanks a lot for the test.
I will submit the patch then.

Thanks,
Kan