linux-kernel - [tip:perf/core] ksym_tracer: NIL-terminate user input filter

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Date:	Sat, 21 Nov 2009 13:34:45 GMT
From:	tip-bot for Li Zefan <lizf@...fujitsu.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	stern@...land.harvard.edu, lizf@...fujitsu.com, fweisbec@...il.com,
	rostedt@...dmis.org, tglx@...utronix.de, mingo@...e.hu,
	prasad@...ux.vnet.ibm.com
Subject: [tip:perf/core] ksym_tracer: NIL-terminate user input filter

Commit-ID:  011ed56853e07e30653d6f1bfddc56b396218664
Gitweb:     http://git.kernel.org/tip/011ed56853e07e30653d6f1bfddc56b396218664
Author:     Li Zefan <lizf@...fujitsu.com>
AuthorDate: Tue, 7 Jul 2009 13:54:08 +0800
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Fri, 10 Jul 2009 11:59:42 +0200

ksym_tracer: NIL-terminate user input filter

Make sure the user input string is NULL-terminated.

Signed-off-by: Li Zefan <lizf@...fujitsu.com>
Acked-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: "K.Prasad" <prasad@...ux.vnet.ibm.com>
Cc: Alan Stern <stern@...land.harvard.edu>
Cc: Steven Rostedt <rostedt@...dmis.org>
LKML-Reference: <4A52E300.7020601@...fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/trace/trace_ksym.c |    7 ++-----
 1 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/kernel/trace/trace_ksym.c b/kernel/trace/trace_ksym.c
index 72fcb46..8cbed5a 100644
--- a/kernel/trace/trace_ksym.c
+++ b/kernel/trace/trace_ksym.c
@@ -264,11 +264,7 @@ static ssize_t ksym_trace_filter_write(struct file *file,
 	unsigned long ksym_addr = 0;
 	int ret, op, changed = 0;
 
-	/* Ignore echo "" > ksym_trace_filter */
-	if (count == 0)
-		return 0;
-
-	input_string = kzalloc(count, GFP_KERNEL);
+	input_string = kzalloc(count + 1, GFP_KERNEL);
 	if (!input_string)
 		return -ENOMEM;
 
@@ -276,6 +272,7 @@ static ssize_t ksym_trace_filter_write(struct file *file,
 		kfree(input_string);
 		return -EFAULT;
 	}
+	input_string[count] = '\0';
 
 	ret = op = parse_ksym_trace_str(input_string, &ksymname, &ksym_addr);
 	if (ret < 0) {
--
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