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

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Date:   Tue, 18 Dec 2018 19:07:32 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Clark Williams <williams@...hat.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Hítalo Silva <hitalos@...il.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Pekka Enberg <penberg@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH 62/63] perf symbols: Relax checks on perf-PID.map ownership

From: Arnaldo Carvalho de Melo <acme@...hat.com>

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@...nel.org>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Hítalo Silva <hitalos@...il.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Pekka Enberg <penberg@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: https://lkml.kernel.org/n/tip-tk2jgo2v4v2yjuj28axbpppo@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.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