netdev - [patch 2/8 2.6.32] udp: use limited socket backlog

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]

Date:	Sun, 13 Nov 2011 23:17:35 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <greg@...ah.com>, Zhu Yi <yi.zhu@...el.com>,
	netdev@...r.kernel.org, Eric Dumazet <eric.dumazet@...il.com>
Subject: [patch 2/8 2.6.32] udp: use limited socket backlog

I had to make some changes to the first chunk in net/ipv6/udp.c to
make this to apply.

>From 55349790d7cbf0d381873a7ece1dcafcffd4aaa9 Mon Sep 17 00:00:00 2001
From: Zhu Yi <yi.zhu@...el.com>
Date: Thu, 4 Mar 2010 18:01:42 +0000
Subject: [PATCH] udp: use limited socket backlog

Make udp adapt to the limited socket backlog change.

Cc: "David S. Miller" <davem@...emloft.net>
Cc: Alexey Kuznetsov <kuznet@....inr.ac.ru>
Cc: "Pekka Savola (ipv6)" <pekkas@...core.fi>
Cc: Patrick McHardy <kaber@...sh.net>
Signed-off-by: Zhu Yi <yi.zhu@...el.com>
Acked-by: Eric Dumazet <eric.dumazet@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 0ac8833..2eaeaf1 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1177,8 +1177,10 @@ int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
 	bh_lock_sock(sk);
 	if (!sock_owned_by_user(sk))
 		rc = __udp_queue_rcv_skb(sk, skb);
-	else
-		sk_add_backlog(sk, skb);
+	else if (sk_add_backlog_limited(sk, skb)) {
+		bh_unlock_sock(sk);
+		goto drop;
+	}
 	bh_unlock_sock(sk);
 
 	return rc;
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index ca520d4..4400eb0 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -473,16 +473,19 @@ static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
 			bh_lock_sock(sk2);
 			if (!sock_owned_by_user(sk2))
 				udpv6_queue_rcv_skb(sk2, buff);
-			else
-				sk_add_backlog(sk2, buff);
+			else if (sk_add_backlog_limited(sk2, buff)) {
+				kfree_skb(buff);
+				bh_unlock_sock(sk2);
+				goto out;
+			}
 			bh_unlock_sock(sk2);
 		}
 	}
 	bh_lock_sock(sk);
 	if (!sock_owned_by_user(sk))
 		udpv6_queue_rcv_skb(sk, skb);
-	else
-		sk_add_backlog(sk, skb);
+	else if (sk_add_backlog_limited(sk, skb))
+		kfree_skb(skb);
 	bh_unlock_sock(sk);
 out:
 	spin_unlock(&hslot->lock);
@@ -601,8 +604,12 @@ int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
 	bh_lock_sock(sk);
 	if (!sock_owned_by_user(sk))
 		udpv6_queue_rcv_skb(sk, skb);
-	else
-		sk_add_backlog(sk, skb);
+	else if (sk_add_backlog_limited(sk, skb)) {
+		atomic_inc(&sk->sk_drops);
+		bh_unlock_sock(sk);
+		sock_put(sk);
+		goto discard;
+	}
 	bh_unlock_sock(sk);
 	sock_put(sk);
 	return 0;
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html