linux-kernel - Re: [PATCH 2/4] perf test: Pass the verbose option to shell tests

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Date:   Sat, 19 Jun 2021 10:03:36 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Song Liu <songliubraving@...com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH 2/4] perf test: Pass the verbose option to shell tests

Em Fri, Jun 18, 2021 at 09:45:05PM -0700, Ian Rogers escreveu:
> On Fri, Jun 18, 2021 at 9:49 AM Arnaldo Carvalho de Melo
> <acme@...nel.org> wrote:
> >
> > Em Thu, Jun 17, 2021 at 04:19:06PM -0300, Arnaldo Carvalho de Melo escreveu:
> > > Em Thu, Jun 17, 2021 at 11:42:14AM -0700, Ian Rogers escreveu:
> > > > Having a verbose option will allow shell tests to provide extra failure
> > > > details when the fail or skip.
> > >
> > >
> > > Thanks, applied to perf/core.
> > >
> > > - Arnaldo
> > >
> > > > Signed-off-by: Ian Rogers <irogers@...gle.com>
> > > > ---
> > > >  tools/perf/tests/builtin-test.c | 5 ++++-
> > > >  1 file changed, 4 insertions(+), 1 deletion(-)
> > > >
> > > > diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
> > > > index cbbfe48ab802..a8160b1684de 100644
> > > > --- a/tools/perf/tests/builtin-test.c
> > > > +++ b/tools/perf/tests/builtin-test.c
> > > > @@ -577,11 +577,14 @@ struct shell_test {
> > > >  static int shell_test__run(struct test *test, int subdir __maybe_unused)
> > > >  {
> > > >     int err;
> > > > -   char script[PATH_MAX];
> > > > +   char script[PATH_MAX + 3];
> > > >     struct shell_test *st = test->priv;
> > > >
> > > >     path__join(script, sizeof(script), st->dir, st->file);
> >
> > probably you need to add a  '- 3' after the sizeof above, right?
> 
> Either way is fine, but -3 is ok with me.
> 
> > > >
> > > > +   if (verbose)
> > > > +           strncat(script, " -v", sizeof(script));
> > > > +
> >
> > Seemed simple enough, but gcc knows better, I'm removing this one:
> >
> >     tests/builtin-test.c:586:26: error: the value of the size argument in 'strncat' is too large, might lead to a buffer overflow [-Werror,-Wstrncat-size]
> >                     strncat(script, " -v", sizeof(script));
> >                                            ^~~~~~~~~~~~~~
> >     tests/builtin-test.c:586:26: note: change the argument to be the free space in the destination buffer minus the terminating null byte
> >                     strncat(script, " -v", sizeof(script));
> >                                            ^~~~~~~~~~~~~~
> >                                            sizeof(script) - strlen(script) - 1
> >     1 error generated.
> >     make[3]: *** [/git/perf-5.13.0-rc4/tools/build/Makefile.build:139: tests] Error 2
> >   77    31.98 ubuntu:21.04                  : FAIL gcc version 10.3.0 (Ubuntu 10.3.0-1ubuntu1)
> >     tests/builtin-test.c:586:26: error: the value of the size argument in 'strncat' is too large, might lead to a buffer overflow [-Werror,-Wstrncat-size]
> >                     strncat(script, " -v", sizeof(script));
> >                                            ^~~~~~~~~~~~~~
> >     tests/builtin-test.c:586:26: note: change the argument to be the free space in the destination buffer minus the terminating null byte
> >                     strncat(script, " -v", sizeof(script));
> >                                            ^~~~~~~~~~~~~~
> >                                            sizeof(script) - strlen(script) - 1
> >     1 error generated.
> >     make[3]: *** [/git/perf-5.13.0-rc4/tools/build/Makefile.build:139: tests] Error 2
> 
> Thanks gcc :-) Do you want me to resend the patch?

In such cases please do,

- Arnaldo