netdev - Re: [PATCH] net: always use icmp{,v6}_ndo_send from ndo_start

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Message-ID: <CA+FuTScmM12PG96k8ZjGd1zCjAaGzjk3cOS+xam+_h6sx2_HDA@mail.gmail.com>
Date:   Fri, 26 Feb 2021 16:25:01 -0500
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH] net: always use icmp{,v6}_ndo_send from ndo_start_xmit

On Thu, Feb 25, 2021 at 6:46 PM Jason A. Donenfeld <Jason@...c4.com> wrote:
>
> There were a few remaining tunnel drivers that didn't receive the prior
> conversion to icmp{,v6}_ndo_send. Knowing now that this could lead to
> memory corrution (see ee576c47db60 ("net: icmp: pass zeroed opts from
> icmp{,v6}_ndo_send before sending") for details), there's even more
> imperative to have these all converted. So this commit goes through the
> remaining cases that I could find and does a boring translation to the
> ndo variety.
>
> Cc: Willem de Bruijn <willemb@...gle.com>
> Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>

Using a stack variable over skb->cb[] is definitely the right fix for
all of these. Thanks Jason.

Only part that I don't fully know is the conntrack conversion. That is
a behavioral change. What is the context behind that? I assume it's
fine. In that if needed, that is the case for all devices, nothing
specific about the couple that call icmp(v6)_ndo_send already.