netdev - Re: [PATCH bpf-next] flow_dissector: lookup netns by skb->sk if skb->dev is NULL

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Tue, 25 Sep 2018 17:38:15 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        netdev@...r.kernel.org
Cc:     ast@...nel.org, davem@...emloft.net,
        Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH bpf-next] flow_dissector: lookup netns by skb->sk if
 skb->dev is NULL

On 09/24/2018 10:49 PM, Willem de Bruijn wrote:
> From: Willem de Bruijn <willemb@...gle.com>
> 
> BPF flow dissectors are configured per network namespace.
> __skb_flow_dissect looks up the netns through dev_net(skb->dev).
> 
> In some dissector paths skb->dev is NULL, such as for Unix sockets.
> In these cases fall back to looking up the netns by socket.
> 
> Analyzing the codepaths leading to __skb_flow_dissect I did not find
> a case where both skb->dev and skb->sk are NULL. Warn and fall back to
> standard flow dissector if one is found.
> 
> Fixes: d58e468b1112 ("flow_dissector: implements flow dissector BPF hook")
> Reported-by: Eric Dumazet <edumazet@...gle.com>
> Signed-off-by: Willem de Bruijn <willemb@...gle.com>

Applied to bpf-next, thanks Willem!