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authorNamhyung Kim <namhyung@kernel.org>2022-09-21 01:28:21 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2022-09-21 22:08:00 +0300
commit999e4eaa4b3691acf85d094836260ec4b66c74fd (patch)
treebf14603518f8f4a8ef0e35793c7271c82b231da2
parent356edeca2e811642b5848605c2f5f9a7c6c32112 (diff)
downloadlinux-999e4eaa4b3691acf85d094836260ec4b66c74fd.tar.xz
perf tools: Honor namespace when synthesizing build-ids
It needs to enter the namespace before reading a file. Fixes: 4183a8d70a288627 ("perf tools: Allow synthesizing the build id for kernel/modules/tasks in PERF_RECORD_MMAP2") Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Ian Rogers <irogers@google.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lore.kernel.org/lkml/20220920222822.2171056-1-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
-rw-r--r--tools/perf/util/synthetic-events.c17
1 files changed, 14 insertions, 3 deletions
diff --git a/tools/perf/util/synthetic-events.c b/tools/perf/util/synthetic-events.c
index 812424dbf2d5..538790758e24 100644
--- a/tools/perf/util/synthetic-events.c
+++ b/tools/perf/util/synthetic-events.c
@@ -367,13 +367,24 @@ static void perf_record_mmap2__read_build_id(struct perf_record_mmap2 *event,
bool is_kernel)
{
struct build_id bid;
+ struct nsinfo *nsi;
+ struct nscookie nc;
int rc;
- if (is_kernel)
+ if (is_kernel) {
rc = sysfs__read_build_id("/sys/kernel/notes", &bid);
- else
- rc = filename__read_build_id(event->filename, &bid) > 0 ? 0 : -1;
+ 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));
event->build_id_size = (u8) bid.size;