linux-kernel - [PATCH] perf tools: Check '/tmp/perf-' symbol file ownership

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Date:	Tue,  9 Aug 2011 22:54:18 +0300
From:	Pekka Enberg <penberg@...nel.org>
To:	linux-kernel@...r.kernel.org
Cc:	Pekka Enberg <penberg@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH] perf tools: Check '/tmp/perf-' symbol file ownership

The external symbol files are generated by JIT compilers, for example, but we
need to make sure they're ours before injecting them to 'perf report'.

Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Pekka Enberg <penberg@...nel.org>
---
 tools/perf/util/symbol.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index eec1963..a8b5371 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1504,6 +1504,17 @@ int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
 	dso->adjust_symbols = 0;
 
 	if (strncmp(dso->name, "/tmp/perf-", 10) == 0) {
+		struct stat st;
+
+		if (stat(dso->name, &st) < 0)
+			return -1;
+
+		if (st.st_uid && (st.st_uid != geteuid())) {
+			pr_warning("File %s not owned by current user or root, "
+				"ignoring it.\n", dso->name);
+			return -1;
+		}
+
 		ret = dso__load_perf_map(dso, map, filter);
 		dso->symtab_type = ret > 0 ? SYMTAB__JAVA_JIT :
 					      SYMTAB__NOT_FOUND;
-- 
1.7.0.4

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