linux-kernel - [PATCH 2/4] perf tools: Check $HOME/.perfconfig ownership

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Date:	Tue,  9 Aug 2011 16:43:06 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Ben Hutchings <ben@...adent.org.uk>,
	Christian Ohm <chr.ohm@....net>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jonathan Nieder <jrnieder@...il.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: [PATCH 2/4] perf tools: Check $HOME/.perfconfig ownership

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

Just like we do already for perf.data files.

Requested-by: Ingo Molnar <mingo@...e.hu>
Cc: Ben Hutchings <ben@...adent.org.uk>
Cc: Christian Ohm <chr.ohm@....net>
Cc: David Ahern <dsahern@...il.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Jonathan Nieder <jrnieder@...il.com>
Cc: Mike Galbraith <efault@....de>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/n/tip-qgokmxsmvppwpc5404qhyk7e@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/config.c |   27 +++++++++++++++++++++++----
 1 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/config.c b/tools/perf/util/config.c
index 6c86eca..fe02903 100644
--- a/tools/perf/util/config.c
+++ b/tools/perf/util/config.c
@@ -413,13 +413,32 @@ int perf_config(config_fn_t fn, void *data)
 	home = getenv("HOME");
 	if (perf_config_global() && home) {
 		char *user_config = strdup(mkpath("%s/.perfconfig", home));
-		if (!access(user_config, R_OK)) {
-			ret += perf_config_from_file(fn, user_config, data);
-			found += 1;
+		struct stat st;
+
+		if (user_config == NULL) {
+			warning("Not enough memory to process %s/.perfconfig, "
+				"ignoring it.", home);
+			goto out;
+		}
+
+		if (stat(user_config, &st) < 0)
+			goto out_free;
+
+		if (st.st_uid && (st.st_uid != geteuid())) {
+			warning("File %s not owned by current user or root, "
+				"ignoring it.", user_config);
+			goto out_free;
 		}
+
+		if (!st.st_size)
+			goto out_free;
+
+		ret += perf_config_from_file(fn, user_config, data);
+		found += 1;
+out_free:
 		free(user_config);
 	}
-
+out:
 	if (found == 0)
 		return -1;
 	return ret;
-- 
1.6.2.5

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