| Message ID | 20240724170452.16837-3-dongli.zhang@oracle.com (mailing list archive) |
|---|---|
| State | Accepted |
| Commit | 049584807f1d797fc3078b68035450a9769eb5c3 |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | tap/tun: harden by dropping short frame | expand |
diff --git a/drivers/net/tun.c b/drivers/net/tun.c index 9b24861464bc..1d06c560c5e6 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -2455,6 +2455,9 @@ static int tun_xdp_one(struct tun_struct *tun, bool skb_xdp = false; struct page *page; + if (unlikely(datasize < ETH_HLEN)) + return -EINVAL; + xdp_prog = rcu_dereference(tun->xdp_prog); if (xdp_prog) { if (gso->gso_type) {
The cited commit missed to check against the validity of the frame length in the tun_xdp_one() path, which could cause a corrupted skb to be sent downstack. Even before the skb is transmitted, the tun_xdp_one-->eth_type_trans() may access the Ethernet header although it can be less than ETH_HLEN. Once transmitted, this could either cause out-of-bound access beyond the actual length, or confuse the underlayer with incorrect or inconsistent header length in the skb metadata. In the alternative path, tun_get_user() already prohibits short frame which has the length less than Ethernet header size from being transmitted for IFF_TAP. This is to drop any frame shorter than the Ethernet header size just like how tun_get_user() does. CVE: CVE-2024-41091 Inspired-by: https://lore.kernel.org/netdev/1717026141-25716-1-git-send-email-si-wei.liu@oracle.com/ Fixes: 043d222f93ab ("tuntap: accept an array of XDP buffs through sendmsg()") Cc: Si-Wei Liu <si-wei.liu@oracle.com> Cc: stable@vger.kernel.org Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com> Reviewed-by: Si-Wei Liu <si-wei.liu@oracle.com> Reviewed-by: Willem de Bruijn <willemb@google.com> Reviewed-by: Paolo Abeni <pabeni@redhat.com> Reviewed-by: Jason Wang <jasowang@redhat.com> --- drivers/net/tun.c | 3 +++ 1 file changed, 3 insertions(+)