linux-kernel - [tip:perf/urgent] perf probe: Fix event namelist to duplicate string

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Message-ID: <tip-e1d2017b24fb31602f1128e6a8b2afc54c9283cd@git.kernel.org>
Date:	Mon, 7 Dec 2009 17:37:03 GMT
From:	tip-bot for Masami Hiramatsu <mhiramat@...hat.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com, hpa@...or.com,
	mingo@...hat.com, dle-develop@...ts.sourceforge.net,
	fweisbec@...il.com, tglx@...utronix.de, mhiramat@...hat.com,
	mingo@...e.hu, systemtap@...rces.redhat.com
Subject: [tip:perf/urgent] perf probe: Fix event namelist to duplicate string

Commit-ID:  e1d2017b24fb31602f1128e6a8b2afc54c9283cd
Gitweb:     http://git.kernel.org/tip/e1d2017b24fb31602f1128e6a8b2afc54c9283cd
Author:     Masami Hiramatsu <mhiramat@...hat.com>
AuthorDate: Mon, 7 Dec 2009 12:00:46 -0500
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Mon, 7 Dec 2009 18:33:21 +0100

perf probe: Fix event namelist to duplicate string

Fix event namelist to duplicate string. Without duplicating, adding
multiple probes causes stack overwrite bug, because it reuses a
buffer on stack while the buffer is already added in the namelist.
String duplication solves this bug because only contents of the
buffer is copied to the namelist.

Signed-off-by: Masami Hiramatsu <mhiramat@...hat.com>
Cc: systemtap <systemtap@...rces.redhat.com>
Cc: DLE <dle-develop@...ts.sourceforge.net>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
LKML-Reference: <20091207170046.19230.55557.stgit@...p-100-2-132.bos.redhat.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 tools/perf/util/probe-event.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index cd7fbda..de0d913 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -413,12 +413,13 @@ static struct strlist *get_perf_event_names(int fd)
 
 	rawlist = get_trace_kprobe_event_rawlist(fd);
 
-	sl = strlist__new(false, NULL);
+	sl = strlist__new(true, NULL);
 	for (i = 0; i < strlist__nr_entries(rawlist); i++) {
 		ent = strlist__entry(rawlist, i);
 		parse_trace_kprobe_event(ent->s, &group, &event, NULL);
 		strlist__add(sl, event);
 		free(group);
+		free(event);
 	}
 
 	strlist__delete(rawlist);
@@ -480,5 +481,6 @@ void add_trace_kprobe_events(struct probe_point *probes, int nr_probes)
 			strlist__add(namelist, event);
 		}
 	}
+	strlist__delete(namelist);
 	close(fd);
 }
--
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