linux-kernel - [PATCH -tip 2/3] [BUGFIX] perf probe: Fix probe

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Date:	Fri, 12 Mar 2010 18:22:17 -0500
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>, lkml <linux-kernel@...r.kernel.org>
Cc:	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: [PATCH -tip 2/3] [BUGFIX] perf probe: Fix probe_point buffer overrun

Fix probe_point array-size overrun problem. In some cases (e.g. inline
function), one user-specified probe-point can be translated to many
probe address, and it overruns pre-defined array-size.
This also removes redundant MAX_PROBES macro definition.

Signed-off-by: Masami Hiramatsu <mhiramat@...hat.com>
Cc: Ingo Molnar <mingo@...e.hu>
---

 tools/perf/builtin-probe.c     |    1 -
 tools/perf/util/probe-finder.c |    3 +++
 2 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index c30a335..152d6c9 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -47,7 +47,6 @@
 #include "util/probe-event.h"
 
 #define MAX_PATH_LEN 256
-#define MAX_PROBES 128
 
 /* Session management structure */
 static struct {
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 1e6c65e..f9cbbf1 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -455,6 +455,9 @@ static void show_probe_point(Dwarf_Die *sp_die, struct probe_finder *pf)
 	/* *pf->fb_ops will be cached in libdw. Don't free it. */
 	pf->fb_ops = NULL;
 
+	if (pp->found == MAX_PROBES)
+		die("Too many( > %d) probe point found.\n", MAX_PROBES);
+
 	pp->probes[pp->found] = strdup(tmp);
 	pp->found++;
 }


-- 
Masami Hiramatsu
e-mail: mhiramat@...hat.com
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