linux-kernel - [PATCH 6/9] perf pmu: Use relative path in perf_pmu__caps

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Date:   Fri, 31 Mar 2023 13:29:46 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>
Cc:     Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-perf-users@...r.kernel.org,
        Kan Liang <kan.liang@...ux.intel.com>,
        Leo Yan <leo.yan@...aro.org>
Subject: [PATCH 6/9] perf pmu: Use relative path in perf_pmu__caps_parse()

Likewise, it needs to traverse the pmu/caps directory, let's use
openat() with the dirfd instead of open() using the absolute path.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/util/pmu.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 9fc6b8b5732b..0c1d87f10b23 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -1804,6 +1804,7 @@ int perf_pmu__caps_parse(struct perf_pmu *pmu)
 	char caps_path[PATH_MAX];
 	DIR *caps_dir;
 	struct dirent *evt_ent;
+	int caps_fd;
 
 	if (pmu->caps_initialized)
 		return pmu->nr_caps;
@@ -1822,18 +1823,19 @@ int perf_pmu__caps_parse(struct perf_pmu *pmu)
 	if (!caps_dir)
 		return -EINVAL;
 
+	caps_fd = dirfd(caps_dir);
+
 	while ((evt_ent = readdir(caps_dir)) != NULL) {
-		char path[PATH_MAX + NAME_MAX + 1];
 		char *name = evt_ent->d_name;
 		char value[128];
 		FILE *file;
+		int fd;
 
 		if (!strcmp(name, ".") || !strcmp(name, ".."))
 			continue;
 
-		snprintf(path, sizeof(path), "%s/%s", caps_path, name);
-
-		file = fopen(path, "r");
+		fd = openat(caps_fd, name, O_RDONLY);
+		file = fdopen(fd, "r");
 		if (!file)
 			continue;
 
-- 
2.40.0.348.gf938b09366-goog