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Date:   Sun, 11 Oct 2020 12:11:29 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     netdev@...r.kernel.org
Cc:     Cong Wang <xiyou.wangcong@...il.com>,
        syzbot+4a2c52677a8a1aa283cb@...kaller.appspotmail.com,
        Xie He <xie.he.0141@...il.com>,
        William Tu <u9012063@...il.com>,
        Willem de Bruijn <willemdebruijn.kernel@...il.com>
Subject: [Patch net v2] ip_gre: set dev->hard_header_len and dev->needed_headroom properly

GRE tunnel has its own header_ops, ipgre_header_ops, and sets it
conditionally. When it is set, it assumes the outer IP header is
already created before ipgre_xmit().

This is not true when we send packets through a raw packet socket,
where L2 headers are supposed to be constructed by user. Packet
socket calls dev_validate_header() to validate the header. But
GRE tunnel does not set dev->hard_header_len, so that check can
be simply bypassed, therefore uninit memory could be passed down
to ipgre_xmit(). Similar for dev->needed_headroom.

dev->hard_header_len is supposed to be the length of the header
created by dev->header_ops->create(), so it should be used whenever
header_ops is set, and dev->needed_headroom should be used when it
is not set.

Reported-and-tested-by: syzbot+4a2c52677a8a1aa283cb@...kaller.appspotmail.com
Cc: Xie He <xie.he.0141@...il.com>
Cc: William Tu <u9012063@...il.com>
Cc: Willem de Bruijn <willemdebruijn.kernel@...il.com>
Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
---
Note, there are some other suspicious use of dev->hard_header_len in
the same file, but let's leave them to a separate patch if really
needed.

 net/ipv4/ip_gre.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 4e31f23e4117..82fee0010353 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -626,8 +626,7 @@ static netdev_tx_t ipgre_xmit(struct sk_buff *skb,
 
 	if (dev->header_ops) {
 		/* Need space for new headers */
-		if (skb_cow_head(skb, dev->needed_headroom -
-				      (tunnel->hlen + sizeof(struct iphdr))))
+		if (skb_cow_head(skb, dev->hard_header_len))
 			goto free_skb;
 
 		tnl_params = (const struct iphdr *)skb->data;
@@ -748,7 +747,11 @@ static void ipgre_link_update(struct net_device *dev, bool set_mtu)
 	len = tunnel->tun_hlen - len;
 	tunnel->hlen = tunnel->hlen + len;
 
-	dev->needed_headroom = dev->needed_headroom + len;
+	if (dev->header_ops)
+		dev->hard_header_len += len;
+	else
+		dev->needed_headroom += len;
+
 	if (set_mtu)
 		dev->mtu = max_t(int, dev->mtu - len, 68);
 
@@ -944,6 +947,7 @@ static void __gre_tunnel_init(struct net_device *dev)
 	tunnel->parms.iph.protocol = IPPROTO_GRE;
 
 	tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
+	dev->needed_headroom = tunnel->hlen + sizeof(tunnel->parms.iph);
 
 	dev->features		|= GRE_FEATURES;
 	dev->hw_features	|= GRE_FEATURES;
@@ -987,10 +991,14 @@ static int ipgre_tunnel_init(struct net_device *dev)
 				return -EINVAL;
 			dev->flags = IFF_BROADCAST;
 			dev->header_ops = &ipgre_header_ops;
+			dev->hard_header_len = tunnel->hlen + sizeof(*iph);
+			dev->needed_headroom = 0;
 		}
 #endif
 	} else if (!tunnel->collect_md) {
 		dev->header_ops = &ipgre_header_ops;
+		dev->hard_header_len = tunnel->hlen + sizeof(*iph);
+		dev->needed_headroom = 0;
 	}
 
 	return ip_tunnel_init(dev);
-- 
2.28.0

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