netdev - Re: [PATCH net-next 1/4] netlink: truncate overlength attribute list in nla_nest

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Date: Mon, 5 Jun 2023 10:28:06 +0300
From: Gal Pressman <gal@...dia.com>
To: Edwin Peer <edwin.peer@...adcom.com>, David Ahern <dsahern@...il.com>
Cc: netdev <netdev@...r.kernel.org>, Jakub Kicinski <kuba@...nel.org>,
 Andrew Gospodarek <andrew.gospodarek@...adcom.com>,
 Michael Chan <michael.chan@...adcom.com>,
 Stephen Hemminger <stephen@...workplumber.org>,
 Michal Kubecek <mkubecek@...e.cz>
Subject: Re: [PATCH net-next 1/4] netlink: truncate overlength attribute list
 in nla_nest_end()

On 26/01/2021 19:51, Edwin Peer wrote:
> On Mon, Jan 25, 2021 at 8:56 PM David Ahern <dsahern@...il.com> wrote:
> 
>> I'm not a fan of the skb trim idea. I think it would be better to figure
>> out how to stop adding to the skb when an attr length is going to exceed
>> 64kB. Not failing hard with an error (ip link sh needs to succeed), but
>> truncating the specific attribute of a message with a flag so userspace
>> knows it is short.
> 
> Absent the ability to do something useful in terms of actually
> avoiding the overflow [1], I'm abandoning this approach entirely. I
> have a different idea that I will propose in due course.
> 
> [1] https://marc.info/?l=linux-netdev&m=161163943811663
> 
> Regards,
> Edwin Peer

Hello Edwin,

I'm also interested in getting this issue resolved, have you had any
progress since this series? Are you still working on it?