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authorCong Wang <xiyou.wangcong@gmail.com>2020-10-12 16:17:21 -0700
committerJakub Kicinski <kuba@kernel.org>2020-10-13 18:35:29 -0700
commitfdafed459998e2be0e877e6189b24cb7a0183224 (patch)
tree7b4f6180adf6214fe2e521460baa4727c7551087 /net
parent4e3bbb33e6f36e4b05be1b1b9b02e3dd5aaa3e69 (diff)
downloadlinux-fdafed459998e2be0e877e6189b24cb7a0183224.tar.bz2
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@syzkaller.appspotmail.com Cc: William Tu <u9012063@gmail.com> Acked-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Acked-by: Xie He <xie.he.0141@gmail.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/ip_gre.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 4e31f23e4117..e70291748889 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -625,9 +625,7 @@ 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, 0))
goto free_skb;
tnl_params = (const struct iphdr *)skb->data;
@@ -748,7 +746,11 @@ 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 +946,7 @@ 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 +990,14 @@ 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);