[PATCH 62/63] perf symbols: Relax checks on perf-PID.map ownership

Arnaldo Carvalho de Melo
2018-12-18T22:17:48Z

Those are simple enough, and usually not produced by root, instead by
whatever user is running java, rust, Node.js JIT code that end up
generating those /tmp/perf-PID.map for resolution of symbols in the
anonymous executable maps.

Having to use --force to resolve symbols in 'perf top' is a distraction,
as recently I experienced when node.js symbols were not being resolved
by 'perf top'.

Acked-by: Ingo Molnar <mingo@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Hítalo Silva <hitalos@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/n/tip-tk2jgo2v4v2yjuj28axbpppo@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/symbol.c | 11 -----------
1 file changed, 11 deletions(-)

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index dcce74bae6de..01f2c7385e38 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1537,17 +1537,6 @@ int dso__load(struct dso *dso, struct map *map)
dso->adjust_symbols = 0;

if (perfmap) {
- struct stat st;
-
- if (lstat(map_path, &st) < 0)
- goto out;
-
- if (!symbol_conf.force && st.st_uid && (st.st_uid != geteuid())) {
- pr_warning("File %s not owned by current user or root, "
- "ignoring it (use -f to override).\n", map_path);
- goto out;
- }
-
ret = dso__load_perf_map(map_path, dso);
dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
DSO_BINARY_TYPE__NOT_FOUND;
--
2.19.2