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Date:   Sun, 17 Jan 2021 20:48:20 -0700
From:   David Ahern <>
To:     Jakub Kicinski <>, Michal Kubecek <>
Cc:, Edwin Peer <>,
        Stephen Hemminger <>,
        Andrew Gospodarek <>,
        Michael Chan <>
Subject: Re: [PATCH iproute2] iplink: work around rtattr length limits for

On 1/16/21 6:21 PM, Jakub Kicinski wrote:
> I wonder. There is something inherently risky about making
> a precedent for user space depending on invalid kernel output.
> _If_ we want to fix the kernel, IMO we should only fix the kernel.

IMHO this is a kernel bug that should be fixed. An easy fix to check the
overflow in nla_nest_end and return an error. Sadly, nla_nest_end return
code is ignored and backporting any change to fix that will be
nightmare. A warning will identify places that need to be fixed.

We can at least catch and fix this overflow which is by far the primary
known victim of the rollover.

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