linux-kernel - [PATCH 4/8] ksym_tracer: Fix validation of length of access type

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Date:	Tue, 07 Jul 2009 13:53:47 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	"K.Prasad" <prasad@...ux.vnet.ibm.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 4/8] ksym_tracer: Fix validation of length of access type

Don't take newline into account, otherwise:

 # echo 'pid_max:-w-' > ksym_trace_filter
 # echo -n 'pid_max:rw-' > ksym_trace_filter
 bash: echo: write error: Invalid argument

Signed-off-by: Li Zefan <lizf@...fujitsu.com>
---
 kernel/trace/trace_ksym.c |   14 +++++++-------
 1 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/kernel/trace/trace_ksym.c b/kernel/trace/trace_ksym.c
index 9556009..72fcb46 100644
--- a/kernel/trace/trace_ksym.c
+++ b/kernel/trace/trace_ksym.c
@@ -158,21 +158,21 @@ static int ksym_trace_get_access_type(char *str)
 static int parse_ksym_trace_str(char *input_string, char **ksymname,
 							unsigned long *addr)
 {
-	char *delimiter = ":";
 	int ret;
 
-	ret = -EINVAL;
-	*ksymname = strsep(&input_string, delimiter);
+	strstrip(input_string);
+
+	*ksymname = strsep(&input_string, ":");
 	*addr = kallsyms_lookup_name(*ksymname);
 
 	/* Check for malformed request: (2), (1) and (5) */
 	if ((!input_string) ||
-		(strlen(input_string) != (KSYM_TRACER_OP_LEN + 1)) ||
-			(*addr == 0))
-		goto return_code;
+	    (strlen(input_string) != KSYM_TRACER_OP_LEN) ||
+	    (*addr == 0))
+		return -EINVAL;;
+
 	ret = ksym_trace_get_access_type(input_string);
 
-return_code:
 	return ret;
 }
 
-- 
1.5.4.rc3
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