From: Daniel Borkmann <dan...@iogearbox.net>
Date: Fri, 14 Aug 2015 12:38:21 +0200
> diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
> index 67d2104..4307446 100644
> --- a/net/netlink/af_netlink.c
> +++ b/net/netlink/af_netlink.c
> @@ -238,6 +238,13 @@ static void __netlink_deliver_tap(struct sk_buff
> *skb)
>
> static void netlink_deliver_tap(struct sk_buff *skb)
> {
> + /* Netlink mmaped skbs must not access shared info, and thus
> + * are not allowed to be cloned. For now, just don't allow
> + * them to get inspected by taps.
> + */
> + if (netlink_skb_is_mmaped(skb))
> + return;
> +
I would seriously rather see us do an expensive full copy of the SKB
than to have traffic which is unexpectedly invisible to taps.
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