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Message-ID: <YoejAP5Yfnh7ViIZ@kernel.org>
Date: Fri, 20 May 2022 11:17:36 -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@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Riccardo Mancini <rickyman7@...il.com>,
Adrian Hunter <adrian.hunter@...el.com>,
Marco Elver <elver@...gle.com>,
Sohaib Mohamed <sohaib.amhmd@...il.com>,
linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH] perf test: Avoid shell test description infinite loop
Em Tue, May 17, 2022 at 01:41:44PM -0700, Ian Rogers escreveu:
> for_each_shell_test is already strict in expecting tests to be files and
> executable. It is sometimes possible when it iterates over all files
> that it finds one that is executable and lacks a newline character. When
> this happens the loop never terminates as it doesn't check for EOF. Add
> the EOF check to make this loop at least bounded by the file size.
>
> If the description is returned as NULL then also skip the test.
Thanks, applied.
- Arnaldo
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
> tools/perf/tests/builtin-test.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
> index 3c34cb766724..aa40eae1c9cf 100644
> --- a/tools/perf/tests/builtin-test.c
> +++ b/tools/perf/tests/builtin-test.c
> @@ -279,6 +279,7 @@ static const char *shell_test__description(char *description, size_t size,
> {
> FILE *fp;
> char filename[PATH_MAX];
> + int ch;
>
> path__join(filename, sizeof(filename), path, name);
> fp = fopen(filename, "r");
> @@ -286,7 +287,9 @@ static const char *shell_test__description(char *description, size_t size,
> return NULL;
>
> /* Skip shebang */
> - while (fgetc(fp) != '\n');
> + do {
> + ch = fgetc(fp);
> + } while (ch != EOF && ch != '\n');
>
> description = fgets(description, size, fp);
> fclose(fp);
> @@ -419,7 +422,8 @@ static int run_shell_tests(int argc, const char *argv[], int i, int width,
> .priv = &st,
> };
>
> - if (!perf_test__matches(test_suite.desc, curr, argc, argv))
> + if (test_suite.desc == NULL ||
> + !perf_test__matches(test_suite.desc, curr, argc, argv))
> continue;
>
> st.file = ent->d_name;
> --
> 2.36.0.550.gb090851708-goog
--
- Arnaldo
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