linux-kernel - [RFC][PATCH v2 3/7] trace_events_filter.c: switch to memcmp() and memmem() for matching

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Message-Id: <1423195215-25134-3-git-send-email-viro@ZenIV.linux.org.uk>
Date:	Fri,  6 Feb 2015 04:00:11 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org
Subject: [RFC][PATCH v2 3/7] trace_events_filter.c: switch to memcmp() and memmem() for matching

From: Al Viro <viro@...iv.linux.org.uk>

we know the lengths in advance...

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 kernel/trace/trace_events_filter.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index ced69da..6c4a96b 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -271,21 +271,25 @@ static int filter_pred_none(struct filter_pred *pred, void *event)
 
 static int regex_match_full(char *str, struct regex *r, int len)
 {
-	if (strncmp(str, r->pattern, len) == 0)
+	if (len - 1 != r->len)
+		return 0;
+	if (memcmp(str, r->pattern, r->len) == 0)
 		return 1;
 	return 0;
 }
 
 static int regex_match_front(char *str, struct regex *r, int len)
 {
-	if (strncmp(str, r->pattern, r->len) == 0)
+	if (len - 1 < r->len)
+		return 0;
+	if (memcmp(str, r->pattern, r->len) == 0)
 		return 1;
 	return 0;
 }
 
 static int regex_match_middle(char *str, struct regex *r, int len)
 {
-	if (strnstr(str, r->pattern, len))
+	if (memmem(str, len, r->pattern, r->len))
 		return 1;
 	return 0;
 }
-- 
2.1.4

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