netdev - Re: [Patch net] ip: fix csum_sub() with csum_block

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]

Message-ID: <CANn89iLqG5bEsJPfeNsm51P6UEkJOu4j0hFFODTHb4W+vqAe=w@mail.gmail.com>
Date:   Thu, 8 Nov 2018 14:16:55 -0800
From:   Eric Dumazet <edumazet@...gle.com>
To:     Cong Wang <xiyou.wangcong@...il.com>,
        Dimitris Michailidis <dmichail@...gle.com>
Cc:     netdev <netdev@...r.kernel.org>, Paolo Abeni <pabeni@...hat.com>,
        Willem de Bruijn <willemb@...gle.com>
Subject: Re: [Patch net] ip: fix csum_sub() with csum_block_sub()

On Thu, Nov 8, 2018 at 2:04 PM Cong Wang <xiyou.wangcong@...il.com> wrote:
>
> When subtracting the checksum of a block of data,
> csum_block_sub() must be used to respect the offset.
>
> We learned this lesson from both commit d55bef5059dd
> ("net: fix pskb_trim_rcsum_slow() with odd trim offset") and
> commit d48051c5b837 ("net/mlx5e: fix csum adjustments caused by RXFCS").
>
> Fixes: ca4ef4574f1e ("ip: fix IP_CHECKSUM handling")

I do not believe you fix any bug here...

I do not know of any inet protocol having odd header sizes.