linux-kernel - Re: [PATCH v4 6/8] perf tests: Use scandirat for shell script finding

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Date: Fri, 16 Feb 2024 12:22:12 -0800
From: Namhyung Kim <namhyung@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Adrian Hunter <adrian.hunter@...el.com>, Nathan Chancellor <nathan@...nel.org>, 
	Nick Desaulniers <ndesaulniers@...gle.com>, Bill Wendling <morbo@...gle.com>, 
	Justin Stitt <justinstitt@...gle.com>, James Clark <james.clark@....com>, 
	Athira Jajeev <atrajeev@...ux.vnet.ibm.com>, Kan Liang <kan.liang@...ux.intel.com>, 
	Yang Jihong <yangjihong1@...wei.com>, linux-kernel@...r.kernel.org, 
	linux-perf-users@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH v4 6/8] perf tests: Use scandirat for shell script finding

On Tue, Feb 13, 2024 at 8:54 PM Ian Rogers <irogers@...gle.com> wrote:
>
> Avoid filename appending buffers by using openat, faccessat and
> scandirat more widely. Turn the script's path back to a file name
> using readlink from /proc/<pid>/fd/<fd>.
>
> Read the script's description using api/io.h to avoid fdopen
> conversions. Whilst reading perform additional sanity checks on the
> script's contents.
>
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/perf/tests/builtin-test.c  |  21 ++---
>  tools/perf/tests/tests-scripts.c | 144 ++++++++++++++++++-------------
>  tools/perf/tests/tests-scripts.h |   1 -
>  3 files changed, 95 insertions(+), 71 deletions(-)
>
> diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
> index eff3c62e9b47..6d5001daaf63 100644
> --- a/tools/perf/tests/builtin-test.c
> +++ b/tools/perf/tests/builtin-test.c
> @@ -300,22 +300,20 @@ static int test_and_print(struct test_suite *t, int subtest)
>  }
>
>  struct shell_test {
> -       const char *dir;
>         const char *file;
>  };
>
>  static int shell_test__run(struct test_suite *test, int subdir __maybe_unused)
>  {
>         int err;
> -       char script[PATH_MAX];
>         struct shell_test *st = test->priv;
> +       char *cmd;
>
> -       path__join(script, sizeof(script) - 3, st->dir, st->file);
> -
> -       if (verbose > 0)
> -               strncat(script, " -v", sizeof(script) - strlen(script) - 1);
> -
> -       err = system(script);
> +       asprintf(&cmd, "%s%s", st->file, verbose ? " -v" : "");
> +       if (!cmd)
> +               return TEST_FAIL;

It fails to build.

tests/tests-scripts.c: In function ‘shell_test__run’:
tests/tests-scripts.c:130:9: error: ignoring return value of
‘asprintf’ declared with attribute ‘warn_unused_result’
[-Werror=unused-result]
  130 |         asprintf(&cmd, "%s%s", file, verbose ? " -v" : "");
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Thanks,
Namhyung


> +       err = system(cmd);
> +       free(cmd);
>         if (!err)
>                 return TEST_OK;
>