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perf tools: Honor namespace when synthesizing build-ids

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[ Upstream commit 999e4eaa4b ]

It needs to enter the namespace before reading a file.

Fixes: 4183a8d70a ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Namhyung Kim 2022-09-20 15:28:21 -07:00 committed by Greg Kroah-Hartman
parent ee7036166b
commit 6acb3e83b5
1 changed files with 14 additions and 3 deletions
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17
tools/perf/util/synthetic-events.c
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@ -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;