mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

net: avoid false positives in untrusted gso validation 

commit 9e8db59132 upstream.

GSO packets with vnet_hdr must conform to a small set of gso_types.
The below commit uses flow dissection to drop packets that do not.

But it has false positives when the skb is not fully initialized.
Dissection needs skb->protocol and skb->network_header.

Infer skb->protocol from gso_type as the two must agree.
SKB_GSO_UDP can use both ipv4 and ipv6, so try both.

Exclude callers for which network header offset is not known.

Fixes: d5be7f632b ("net: validate untrusted gso packets without csum offload")
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Willem de Bruijn 2019-02-18 23:37:12 -05:00 committed by Greg Kroah-Hartman
parent dac7d4432b
commit d996573ebd
1 changed files with 12 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
include/linux/virtio_net.h
View File

@ -61,10 +61,20 @@ static inline int virtio_net_hdr_to_skb(struct sk_buff *skb,
/* gso packets without NEEDS_CSUM do not set transport_offset.
* probe and drop if does not match one of the above types.
*/
if (gso_type) {
if (gso_type && skb->network_header) {
if (!skb->protocol)
virtio_net_hdr_set_proto(skb, hdr);
retry:
skb_probe_transport_header(skb, -1);
if (!skb_transport_header_was_set(skb))
if (!skb_transport_header_was_set(skb)) {
/* UFO does not specify ipv4 or 6: try both */
if (gso_type & SKB_GSO_UDP &&
skb->protocol == htons(ETH_P_IP)) {
skb->protocol = htons(ETH_P_IPV6);
goto retry;
}
return -EINVAL;
}
}
}