linux-kernel - Re: [PATCH] perf jevents: Fix suspicious code in fixregex()

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Date:   Fri, 4 Sep 2020 10:38:35 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Ian Rogers <irogers@...gle.com>, Jiri Olsa <jolsa@...hat.com>,
        William Cohen <wcohen@...hat.com>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Stephane Eranian <eranian@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Andi Kleen <andi@...stfloor.org>,
        John Garry <john.garry@...wei.com>,
        Kajol Jain <kjain@...ux.ibm.com>
Subject: Re: [PATCH] perf jevents: Fix suspicious code in fixregex()

Hi Arnaldo and Ian,

On Fri, Sep 4, 2020 at 3:41 AM Arnaldo Carvalho de Melo <acme@...nel.org> wrote:
>
> Em Thu, Sep 03, 2020 at 10:47:39AM -0700, Ian Rogers escreveu:
> > On Thu, Sep 3, 2020 at 8:25 AM Namhyung Kim <namhyung@...nel.org> wrote:
> > > The new string should have enough space for the original string and
> > > the back slashes IMHO.
>
> > > Cc: John Garry <john.garry@...wei.com>
> > > Cc: Kajol Jain <kjain@...ux.ibm.com>
> > > Cc: Ian Rogers <irogers@...gle.com>
> > > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> >
> > Reviewed-by: Ian Rogers <irogers@...gle.com>
> >
> > Definitely looks like the right fix. I'm surprised this hasn't shown
> > up in sanitizer testing.

I guess the code didn't run on most arch (including x86) since
they don't have backslashes.

>
> Yeap, good catch! Namyung you forgot to add the Fixes tag + Cc the patch
> author that introduced that bug, I did it:
>
> Cc: William Cohen <wcohen@...hat.com>
> Fixes: fbc2844e84038ce3 ("perf vendor events: Use more flexible pattern matching for CPU identification for mapfile.csv"
>
> Please consider doing it next time :-)

Oh, right!  Will do it later..

Thanks
Namhyung