netdev - [PATCH net-next v3 08/10] net: netconsole: do not pass userdata up to the tail

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240910100410.2690012-9-leitao@debian.org>
Date: Tue, 10 Sep 2024 03:04:03 -0700
From: Breno Leitao <leitao@...ian.org>
To: kuba@...nel.org,
	davem@...emloft.net,
	edumazet@...gle.com,
	pabeni@...hat.com
Cc: thepacketgeek@...il.com,
	horms@...nel.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	davej@...emonkey.org.uk,
	vlad.wing@...il.com,
	max@...sevol.com
Subject: [PATCH net-next v3 08/10] net: netconsole: do not pass userdata up to the tail

Do not pass userdata to send_msg_fragmented, since we can get it later.

This will be more useful in the next patch, where send_msg_fragmented()
will be split even more, and userdata is only necessary in the last
function.

Suggested-by: Simon Horman <horms@...nel.org>
Signed-off-by: Breno Leitao <leitao@...ian.org>
---
 drivers/net/netconsole.c | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index 2cdd2d6a2a18..1de547b1deb7 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -1060,13 +1060,17 @@ static struct notifier_block netconsole_netdev_notifier = {
 
 static void send_msg_no_fragmentation(struct netconsole_target *nt,
 				      const char *msg,
-				      const char *userdata,
 				      int msg_len,
 				      int release_len)
 {
 	static char buf[MAX_PRINT_CHUNK]; /* protected by target_list_lock */
+	const char *userdata = NULL;
 	const char *release;
 
+#ifdef CONFIG_NETCONSOLE_DYNAMIC
+	userdata = nt->userdata_complete;
+#endif
+
 	if (release_len) {
 		release = init_utsname()->release;
 
@@ -1094,17 +1098,18 @@ static void append_release(char *buf)
 
 static void send_msg_fragmented(struct netconsole_target *nt,
 				const char *msg,
-				const char *userdata,
 				int msg_len,
 				int release_len)
 {
+	const char *header, *msgbody, *userdata;
 	int header_len, msgbody_len, body_len;
 	static char buf[MAX_PRINT_CHUNK]; /* protected by target_list_lock */
 	int offset = 0, userdata_len = 0;
-	const char *header, *msgbody;
 
-	if (userdata)
-		userdata_len = nt->userdata_length;
+#ifdef CONFIG_NETCONSOLE_DYNAMIC
+	userdata = nt->userdata_complete;
+	userdata_len = nt->userdata_length;
+#endif
 
 	/* need to insert extra header fields, detect header and msgbody */
 	header = msg;
@@ -1201,12 +1206,10 @@ static void send_msg_fragmented(struct netconsole_target *nt,
 static void send_ext_msg_udp(struct netconsole_target *nt, const char *msg,
 			     int msg_len)
 {
-	char *userdata = NULL;
 	int userdata_len = 0;
 	int release_len = 0;
 
 #ifdef CONFIG_NETCONSOLE_DYNAMIC
-	userdata = nt->userdata_complete;
 	userdata_len = nt->userdata_length;
 #endif
 
@@ -1214,10 +1217,9 @@ static void send_ext_msg_udp(struct netconsole_target *nt, const char *msg,
 		release_len = strlen(init_utsname()->release) + 1;
 
 	if (msg_len + release_len + userdata_len <= MAX_PRINT_CHUNK)
-		return send_msg_no_fragmentation(nt, msg, userdata, msg_len,
-						 release_len);
+		return send_msg_no_fragmentation(nt, msg, msg_len, release_len);
 
-	return send_msg_fragmented(nt, msg, userdata, msg_len, release_len);
+	return send_msg_fragmented(nt, msg, msg_len, release_len);
 }
 
 static void write_ext_msg(struct console *con, const char *msg,
-- 
2.43.5