linux-kernel - [PATCH 4/4] perf tools: Honor namespace when synthesizing build-id

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Date:   Fri, 16 Sep 2022 10:59:02 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-perf-users@...r.kernel.org
Subject: [PATCH 4/4] perf tools: Honor namespace when synthesizing build-id

It needs to go into a namespace before reading a file.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/util/synthetic-events.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/perf/util/synthetic-events.c b/tools/perf/util/synthetic-events.c
index e6978b2dee8f..d0d540d09196 100644
--- a/tools/perf/util/synthetic-events.c
+++ b/tools/perf/util/synthetic-events.c
@@ -391,6 +391,8 @@ static void perf_record_mmap2__read_build_id(struct perf_record_mmap2 *event,
 	struct build_id _bid, *bid = &_bid;
 	struct dso *dso = NULL;
 	struct dso_id id;
+	struct nsinfo *nsi;
+	struct nscookie nc;
 	int rc;
 
 	if (is_kernel) {
@@ -410,8 +412,14 @@ static void perf_record_mmap2__read_build_id(struct perf_record_mmap2 *event,
 		goto out;
 	}
 
+	nsi = nsinfo__new(event->pid);
+	nsinfo__mountns_enter(nsi, &nc);
+
 	rc = filename__read_build_id(event->filename, bid) > 0 ? 0 : -1;
 
+	nsinfo__mountns_exit(&nc);
+	nsinfo__put(nsi);
+
 out:
 	if (rc == 0) {
 		memcpy(event->build_id, bid->data, sizeof(bid->data));
-- 
2.37.3.968.ga6b4b080e4-goog