netdev - Re: [PATCH net 1/2] rose: limit sk

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Date:	Wed, 13 Jul 2016 00:49:13 +0200
From:	Daniel Borkmann <daniel@...earbox.net>
To:	Willem de Bruijn <willemdebruijn.kernel@...il.com>,
	netdev@...r.kernel.org
CC:	alexei.starovoitov@...il.com, davem@...emloft.net,
	hannes@...essinduktion.org, eric.dumazet@...il.com,
	Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH net 1/2] rose: limit sk_filter trim to payload

On 07/13/2016 12:18 AM, Willem de Bruijn wrote:
> From: Willem de Bruijn <willemb@...gle.com>
>
> Sockets can have a filter program attached that drops or trims
> incoming packets based on the filter program return value.
>
> Rose requires data packets to have at least ROSE_MIN_LEN bytes. It
> verifies this on arrival in rose_route_frame and unconditionally pulls
> the bytes in rose_recvmsg. The filter can trim packets to below this
> value in-between, causing pull to fail, leaving the partial header at
> the time of skb_copy_datagram_msg.
>
> Place a lower bound on the size to which sk_filter may trim packets
> by introducing sk_filter_trim_cap and call this for rose packets.
>
> Signed-off-by: Willem de Bruijn <willemb@...gle.com>

Acked-by: Daniel Borkmann <daniel@...earbox.net>