linux-kernel - [tip:tracing/urgent] tracing: Fix infinite recursion in ftrace_update_pid

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Date:	Thu, 1 Oct 2009 06:48:50 GMT
From:	tip-bot for Matt Fleming <matthew.fleming@...tec.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	fweisbec@...il.com, rostedt@...dmis.org, tglx@...utronix.de,
	matthew.fleming@...tec.com, mingo@...e.hu
Subject: [tip:tracing/urgent] tracing: Fix infinite recursion in ftrace_update_pid_func()

Commit-ID:  33974093c024f08caadd2fc71a83bd811ed1831d
Gitweb:     http://git.kernel.org/tip/33974093c024f08caadd2fc71a83bd811ed1831d
Author:     Matt Fleming <matthew.fleming@...tec.com>
AuthorDate: Mon, 28 Sep 2009 16:43:01 +0100
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Thu, 1 Oct 2009 08:19:24 +0200

tracing: Fix infinite recursion in ftrace_update_pid_func()

When CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST is enabled
__ftrace_trace_function contains the current trace function, not
ftrace_trace_function.

In ftrace_update_pid_func() we currently incorrectly assign the
value of ftrace_trace_function to __ftrace_trace_funcion before
returning.

Without this patch it is possible to execute an infinite recursion
whereby ftrace_test_stop_func() calls __ftrace_trace_function,
which was assigned ftrace_test_stop_func() in
ftrace_update_pid_func().

Signed-off-by: Matt Fleming <matthew.fleming@...tec.com>
Acked-by: Steven Rostedt <rostedt@...dmis.org>
Cc: Frederic Weisbecker <fweisbec@...il.com>
LKML-Reference: <1254152581-18347-1-git-send-email-matt@...sole-pimps.org>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 kernel/trace/ftrace.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 46592fe..3724756 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -225,7 +225,11 @@ static void ftrace_update_pid_func(void)
 	if (ftrace_trace_function == ftrace_stub)
 		return;
 
+#ifdef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST
 	func = ftrace_trace_function;
+#else
+	func = __ftrace_trace_function;
+#endif
 
 	if (ftrace_pid_trace) {
 		set_ftrace_pid_function(func);
--
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