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Message-ID: <20240405103035.171380-1-edumazet@google.com>
Date: Fri, 5 Apr 2024 10:30:34 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, eric.dumazet@...il.com,
Eric Dumazet <edumazet@...gle.com>, syzbot+9ee20ec1de7b3168db09@...kaller.appspotmail.com,
Phillip Potter <phil@...lpotter.co.uk>, Sabrina Dubroca <sd@...asysnail.net>
Subject: [PATCH v4 net] geneve: fix header validation in geneve[6]_xmit_skb
syzbot is able to trigger an uninit-value in geneve_xmit() [1]
Problem : While most ip tunnel helpers (like ip_tunnel_get_dsfield())
uses skb_protocol(skb, true), pskb_inet_may_pull() is only using
skb->protocol.
If anything else than ETH_P_IPV6 or ETH_P_IP is found in skb->protocol,
pskb_inet_may_pull() does nothing at all.
If a vlan tag was provided by the caller (af_packet in the syzbot case),
the network header might not point to the correct location, and skb
linear part could be smaller than expected.
Add skb_vlan_inet_prepare() to perform a complete mac validation.
Use this in geneve for the moment, I suspect we need to adopt this
more broadly.
v4 - Jakub reported v3 broke l2_tos_ttl_inherit.sh selftest
- Only call __vlan_get_protocol() for vlan types.
Link: https://lore.kernel.org/netdev/20240404100035.3270a7d5@kernel.org/
v2,v3 - Addressed Sabrina comments on v1 and v2
Link: https://lore.kernel.org/netdev/Zg1l9L2BNoZWZDZG@hog/
[1]
BUG: KMSAN: uninit-value in geneve_xmit_skb drivers/net/geneve.c:910 [inline]
BUG: KMSAN: uninit-value in geneve_xmit+0x302d/0x5420 drivers/net/geneve.c:1030
geneve_xmit_skb drivers/net/geneve.c:910 [inline]
geneve_xmit+0x302d/0x5420 drivers/net/geneve.c:1030
__netdev_start_xmit include/linux/netdevice.h:4903 [inline]
netdev_start_xmit include/linux/netdevice.h:4917 [inline]
xmit_one net/core/dev.c:3531 [inline]
dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3547
__dev_queue_xmit+0x348d/0x52c0 net/core/dev.c:4335
dev_queue_xmit include/linux/netdevice.h:3091 [inline]
packet_xmit+0x9c/0x6c0 net/packet/af_packet.c:276
packet_snd net/packet/af_packet.c:3081 [inline]
packet_sendmsg+0x8bb0/0x9ef0 net/packet/af_packet.c:3113
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg+0x30f/0x380 net/socket.c:745
__sys_sendto+0x685/0x830 net/socket.c:2191
__do_sys_sendto net/socket.c:2203 [inline]
__se_sys_sendto net/socket.c:2199 [inline]
__x64_sys_sendto+0x125/0x1d0 net/socket.c:2199
do_syscall_64+0xd5/0x1f0
entry_SYSCALL_64_after_hwframe+0x6d/0x75
Uninit was created at:
slab_post_alloc_hook mm/slub.c:3804 [inline]
slab_alloc_node mm/slub.c:3845 [inline]
kmem_cache_alloc_node+0x613/0xc50 mm/slub.c:3888
kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:577
__alloc_skb+0x35b/0x7a0 net/core/skbuff.c:668
alloc_skb include/linux/skbuff.h:1318 [inline]
alloc_skb_with_frags+0xc8/0xbf0 net/core/skbuff.c:6504
sock_alloc_send_pskb+0xa81/0xbf0 net/core/sock.c:2795
packet_alloc_skb net/packet/af_packet.c:2930 [inline]
packet_snd net/packet/af_packet.c:3024 [inline]
packet_sendmsg+0x722d/0x9ef0 net/packet/af_packet.c:3113
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg+0x30f/0x380 net/socket.c:745
__sys_sendto+0x685/0x830 net/socket.c:2191
__do_sys_sendto net/socket.c:2203 [inline]
__se_sys_sendto net/socket.c:2199 [inline]
__x64_sys_sendto+0x125/0x1d0 net/socket.c:2199
do_syscall_64+0xd5/0x1f0
entry_SYSCALL_64_after_hwframe+0x6d/0x75
CPU: 0 PID: 5033 Comm: syz-executor346 Not tainted 6.9.0-rc1-syzkaller-00005-g928a87efa423 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
Fixes: d13f048dd40e ("net: geneve: modify IP header check in geneve6_xmit_skb and geneve_xmit_skb")
Reported-by: syzbot+9ee20ec1de7b3168db09@...kaller.appspotmail.com
Closes: https://lore.kernel.org/netdev/000000000000d19c3a06152f9ee4@google.com/
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Phillip Potter <phil@...lpotter.co.uk>
Cc: Sabrina Dubroca <sd@...asysnail.net>
---
drivers/net/geneve.c | 4 ++--
include/net/ip_tunnels.h | 33 +++++++++++++++++++++++++++++++++
2 files changed, 35 insertions(+), 2 deletions(-)
diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
index 2f6739fe78af2e8e90c0a3b474c2e99c83e02994..6c2835086b57eacbcddb44a3c507e26d5a944427 100644
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -822,7 +822,7 @@ static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
__be16 sport;
int err;
- if (!pskb_inet_may_pull(skb))
+ if (!skb_vlan_inet_prepare(skb))
return -EINVAL;
if (!gs4)
@@ -929,7 +929,7 @@ static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
__be16 sport;
int err;
- if (!pskb_inet_may_pull(skb))
+ if (!skb_vlan_inet_prepare(skb))
return -EINVAL;
if (!gs6)
diff --git a/include/net/ip_tunnels.h b/include/net/ip_tunnels.h
index 5cd64bb2104df389250fb3c518ba00a3826c53f7..c286cc2e766ee04a77206b7c326b4283de43933e 100644
--- a/include/net/ip_tunnels.h
+++ b/include/net/ip_tunnels.h
@@ -361,6 +361,39 @@ static inline bool pskb_inet_may_pull(struct sk_buff *skb)
return pskb_network_may_pull(skb, nhlen);
}
+/* Variant of pskb_inet_may_pull().
+ */
+static inline bool skb_vlan_inet_prepare(struct sk_buff *skb)
+{
+ int nhlen = 0, maclen = ETH_HLEN;
+ __be16 type = skb->protocol;
+
+ /* Essentially this is skb_protocol(skb, true)
+ * And we get MAC len.
+ */
+ if (eth_type_vlan(type))
+ type = __vlan_get_protocol(skb, type, &maclen);
+
+ switch (type) {
+#if IS_ENABLED(CONFIG_IPV6)
+ case htons(ETH_P_IPV6):
+ nhlen = sizeof(struct ipv6hdr);
+ break;
+#endif
+ case htons(ETH_P_IP):
+ nhlen = sizeof(struct iphdr);
+ break;
+ }
+ /* For ETH_P_IPV6/ETH_P_IP we make sure to pull
+ * a base network header in skb->head.
+ */
+ if (!pskb_may_pull(skb, maclen + nhlen))
+ return false;
+
+ skb_set_network_header(skb, maclen);
+ return true;
+}
+
static inline int ip_encap_hlen(struct ip_tunnel_encap *e)
{
const struct ip_tunnel_encap_ops *ops;
--
2.44.0.478.gd926399ef9-goog
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