linux-kernel - [PATCH 3/4] ftrace: Copy ftrace_graph

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Message-Id: <1255547598-5294-4-git-send-email-fweisbec@gmail.com>
Date:	Wed, 14 Oct 2009 21:13:17 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Li Zefan <lizf@...fujitsu.com>
Subject: [PATCH 3/4] ftrace: Copy ftrace_graph_filter boot param using strlcpy

We are using strncpy in the wrong way to copy the ftrace_graph_filter
boot param because we pass the buffer size instead of the max string
size it can contain (buffer size - 1). The end result might not be
NULL terminated as we are abusing the max string size.

Lets use strlcpy() instead.

Reported-by: Li Zefan <lizf@...fujitsu.com>
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
---
 kernel/trace/ftrace.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index aaea9cd..b10c0d9 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2293,7 +2293,7 @@ __setup("ftrace_filter=", set_ftrace_filter);
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 static int __init set_graph_function(char *str)
 {
-	strncpy(ftrace_graph_buf, str, FTRACE_FILTER_SIZE);
+	strlcpy(ftrace_graph_buf, str, FTRACE_FILTER_SIZE);
 	return 1;
 }
 __setup("ftrace_graph_filter=", set_graph_function);
-- 
1.6.2.3

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