netdev - Re: [PATCH net] ip: Fix SO_MARK in RST, ACK and ICMP packets

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Date:   Wed, 01 Jul 2020 17:39:37 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     willemdebruijn.kernel@...il.com
Cc:     netdev@...r.kernel.org, kafai@...com, willemb@...gle.com
Subject: Re: [PATCH net] ip: Fix SO_MARK in RST, ACK and ICMP packets

From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
Date: Wed,  1 Jul 2020 16:00:06 -0400

> From: Willem de Bruijn <willemb@...gle.com>
> 
> When no full socket is available, skbs are sent over a per-netns
> control socket. Its sk_mark is temporarily adjusted to match that
> of the real (request or timewait) socket or to reflect an incoming
> skb, so that the outgoing skb inherits this in __ip_make_skb.
> 
> Introduction of the socket cookie mark field broke this. Now the
> skb is set through the cookie and cork:
> 
> <caller>		# init sockc.mark from sk_mark or cmsg
> ip_append_data
>   ip_setup_cork		# convert sockc.mark to cork mark
> ip_push_pending_frames
>   ip_finish_skb
>     __ip_make_skb	# set skb->mark to cork mark
> 
> But I missed these special control sockets. Update all callers of
> __ip(6)_make_skb that were originally missed.
> 
> For IPv6, the same two icmp(v6) paths are affected. The third
> case is not, as commit 92e55f412cff ("tcp: don't annotate
> mark on control socket from tcp_v6_send_response()") replaced
> the ctl_sk->sk_mark with passing the mark field directly as a
> function argument. That commit predates the commit that
> introduced the bug.
> 
> Fixes: c6af0c227a22 ("ip: support SO_MARK cmsg")
> Signed-off-by: Willem de Bruijn <willemb@...gle.com>
> Reported-by: Martin KaFai Lau <kafai@...com>

Applied and queued up for -stable, thanks.