linux-kernel - Re: [PATCH v8 2/4] libperf: Add evsel mmap support

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Message-ID: <CAL_JsqLEEeJjP1TmSLt=ruQUureSw1gk5sxP7RvMSm=jXAeOtw@mail.gmail.com>
Date:   Wed, 14 Apr 2021 11:53:41 -0500
From:   Rob Herring <robh@...nel.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Rutland <mark.rutland@....com>,
        Itaru Kitayama <itaru.kitayama@...il.com>
Subject: Re: [PATCH v8 2/4] libperf: Add evsel mmap support

On Wed, Apr 14, 2021 at 11:41 AM Namhyung Kim <namhyung@...nel.org> wrote:
>
> Hello,
>
> On Thu, Apr 15, 2021 at 1:07 AM Rob Herring <robh@...nel.org> wrote:
> > +void *perf_evsel__mmap_base(struct perf_evsel *evsel, int cpu, int thread)
> > +{
> > +       if (FD(evsel, cpu, thread) < 0 || MMAP(evsel, cpu, thread) == NULL)
> > +               return NULL;
>
> I think you should check the cpu and the thread is in
> a valid range.  Currently xyarray__entry() simply accesses
> the content without checking the boundaries.

Happy to add a patch to do that if desired, but I think that's
separate from this series. That would be something to add to
xyarray__entry().

Rob