Patch "udp: prevent skbs lingering in tunnel socket queues" has been added to the 4.4-stable tree
Subsystems (4)
This is a note to let you know that I've just added the patch titled
udp: prevent skbs lingering in tunnel socket queues
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
udp-prevent-skbs-lingering-in-tunnel-socket-queues.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.
Quoted 1 line
From foo@baz Fri Jun 17 11:18:18 PDT 2016
From: Hannes Frederic Sowa <[email protected]>
Date: Thu, 19 May 2016 15:58:33 +0200
Subject: udp: prevent skbs lingering in tunnel socket queues
From: Hannes Frederic Sowa <[email protected]>
[ Upstream commit e5aed006be918af163eb397e45aa5ea6cefd5e01 ]
In case we find a socket with encapsulation enabled we should call the encap_recv function even if just a udp header without payload is available. The callbacks are responsible for correctly verifying and dropping the packets.
Also, in case the header validation fails for geneve and vxlan we shouldn't put the skb back into the socket queue, no one will pick them up there. Instead we can simply discard them in the respective encap_recv functions.
--- drivers/net/geneve.c | 10 +++------- drivers/net/vxlan.c | 10 ++-------- net/ipv4/udp.c | 2 +- net/ipv6/udp.c | 2 +- 4 files changed, 7 insertions(+), 17 deletions(-)
drivers/net/geneve.c +3 -7
@@ -310,15 +310,15 @@ static int geneve_udp_encap_recv(struct/* Need Geneve and inner Ethernet header to be present */ if (unlikely (!pskb_may_pull (skb,GENEVE_BASE_HLEN ))) - goto error; + goto drop;/* Return packets with reserved bits set */ geneveh =geneve_hdr (skb);if (unlikely (geneveh->ver !=GENEVE_VER )) - goto error; + goto drop;if (unlikely (geneveh->proto_type !=htons (ETH_P_TEB ))) - goto error; + goto drop; opts_len = geneveh->opt_len *4 ; if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
@@ -336,10 +336,6 @@ drop:/* Consume bad packet */ kfree_skb (skb);return 0 ; - -error: -/* Let the UDP layer deal with the skb */ -return 1 ; } static struct socket *geneve_create_sock(struct net *net, bool ipv6,
drivers/net/vxlan.c +2 -8
@@ -1254,7 +1254,7 @@ static int vxlan_udp_encap_recv(struct s/* Need Vxlan and inner Ethernet header to be present */ if (!pskb_may_pull (skb,VXLAN_HLEN )) - goto error; + goto drop; vxh = (struct vxlanhdr *)(udp_hdr (skb) +1 ); flags =ntohl (vxh->vx_flags);
@@ -1344,13 +1344,7 @@ drop: bad_flags:netdev_dbg (skb->dev,"invalid vxlan flags=%#x vni=%#x\n" ,ntohl (vxh->vx_flags),ntohl (vxh->vx_vni)); - -error: -if (tun_dst) -dst_release ((struct dst_entry *)tun_dst); - -/* Return non vxlan pkt */ -return 1 ; + goto drop; }static int arp_reduce (struct net_device *dev,struct sk_buff *skb)
net/ipv4/udp.c +1 -1
@@ -1531,7 +1531,7 @@ int udp_queue_rcv_skb(struct sock *sk, s/* if we're overly short, let UDP handle it */ encap_rcv =ACCESS_ONCE (up->encap_rcv); -if (skb->len >sizeof (struct udphdr ) && encap_rcv) { +if (encap_rcv) {int ret;/* Verify checksum before giving to encap */
net/ipv6/udp.c +1 -1
@@ -647,7 +647,7 @@ int udpv6_queue_rcv_skb(struct sock *sk,/* if we're overly short, let UDP handle it */ encap_rcv =ACCESS_ONCE (up->encap_rcv); -if (skb->len >sizeof (struct udphdr ) && encap_rcv) { +if (encap_rcv) {int ret;/* Verify checksum before giving to encap */
Patches currently in stable-queue which might be from [email protected] are
queue-4.4/ipv6-skip-xfrm-lookup-if-dst_entry-in-socket-cache-is-valid.patch queue-4.4/bpf-use-mount_nodev-not-mount_ns-to-mount-the-bpf-filesystem.patch queue-4.4/udp-prevent-skbs-lingering-in-tunnel-socket-queues.patch queue-4.4/bpf-inode-disallow-userns-mounts.patch