linux-kernel - [tip:perf/core] perf symbols: Relax checks on perf-PID.map ownership

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Date:   Thu, 20 Dec 2018 10:32:59 -0800
From:   tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mingo@...nel.org, namhyung@...nel.org, adrian.hunter@...el.com,
        penberg@...nel.org, peterz@...radead.org, tglx@...utronix.de,
        acme@...hat.com, fweisbec@...il.com, linux-kernel@...r.kernel.org,
        hitalos@...il.com, hpa@...or.com, jolsa@...nel.org
Subject: [tip:perf/core] perf symbols: Relax checks on perf-PID.map
 ownership

Commit-ID:  bc055c54b887961bc3545c54e61c844fd4499c2b
Gitweb:     https://git.kernel.org/tip/bc055c54b887961bc3545c54e61c844fd4499c2b
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Tue, 18 Dec 2018 12:39:08 -0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Tue, 18 Dec 2018 16:17:41 -0300

perf symbols: Relax checks on perf-PID.map ownership

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;