netdev - Re: [PATCH bpf-next] bpf: prevent non-IPv4 socket to be added into sock hash

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Message-ID: <ee9f3172-14c5-3bf8-c61f-cf4e19c705f7@gmail.com>
Date:   Fri, 1 Jun 2018 00:56:11 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     Wei Wang <weiwan@...gle.com>, netdev <netdev@...r.kernel.org>,
        Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH bpf-next] bpf: prevent non-IPv4 socket to be added into
 sock hash

On 05/31/2018 06:00 PM, Eric Dumazet wrote:
> On Thu, May 31, 2018 at 7:32 PM John Fastabend <john.fastabend@...il.com> wrote:
>>
>>
>> Hi Wei,
>>
>> Thanks for the report and fix. It would be better to fix the
>> root cause so that IPv6 works as intended.
>>
>> I'm testing the following now,
>>
>> Author: John Fastabend <john.fastabend@...il.com>
>> Date:   Thu May 31 14:38:59 2018 -0700
>>
>>     sockmap: fix crash when ipv6 sock is added by adding support for IPv6
>>
>>     Apparently we had a testing escape and missed IPv6. This fixes a crash
>>     where we assign tcp_prot to IPv6 sockets instead of tcpv6_prot.
>>
>>     Signed-off-by: John Fastabend <john.fastabend@...il.com>
>>
> 
> Hi John
> 
> In any case, please forward correct attribution for Wei's work, and
> syzbot 'Reported-by'

Will send update with tags in a moment.

> 
> Are you sure you are handling IPv4 mapped in IPv6 sockets as well ?
> 

No, will look into it. Although I didn't see any code to handle it
in the ./net/tls case either so if there is some issue with this it
could possibly exist in both ULPs. I guess if ipv4 mapped ipv6
changes prot or callbacks then we could stomp on it.

> Thanks.
>