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Date:   Wed, 31 Aug 2022 20:20:17 -0700
From:   Jakub Kicinski <>
To:     Kees Cook <>
Cc:     Pablo Neira Ayuso <>,
        Jozsef Kadlecsik <>,
        Florian Westphal <>,
        "David S. Miller" <>,
        Eric Dumazet <>,
        Paolo Abeni <>,
        syzbot <>,,,, Yajun Deng <>,
        Oliver Hartkopp <>,
        Harshit Mogalapalli <>,,
Subject: Re: [PATCH 2/2] netlink: Bounds-check struct nlmsgerr creation

On Wed, 31 Aug 2022 20:06:10 -0700 Kees Cook wrote:
> For 32-bit systems, it might be possible to wrap lnmsgerr content
> lengths beyond SIZE_MAX. Explicitly test for all overflows, and mark the
> memcpy() as being unable to internally diagnose overflows.
> This also excludes netlink from the coming runtime bounds check on
> memcpy(), since it's an unusual case of open-coded sizing and
> allocation.

This one you gotta rebase we just rewrote the af_netlink 
part last week :)

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