linux-kernel - Re: [PATCH] af_netlink: give correct bounds to dump skb for NLMSG

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Message-ID: <CAHmME9oiBNXwL-oO-cwa4ggXRT_Ekj+895Gbkj1FJ8DgTjhM4A@mail.gmail.com>
Date:   Wed, 8 Nov 2017 15:03:07 +0900
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Johannes Berg <johannes@...solutions.net>,
        David Miller <davem@...emloft.net>,
        Netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     "Jason A. Donenfeld" <Jason@...c4.com>
Subject: Re: [PATCH] af_netlink: give correct bounds to dump skb for NLMSG_DONE

By the way, in case you're curious, here's the {up,down,cross}stream
WireGuard commit that works around it via its compat layer (a rat's
nest of hideous backports for all the weird kernels people want
WireGuard to run on, which I cannot wait to remove):

https://git.zx2c4.com/WireGuard/commit/?id=f689ea7acc23dc8e0968699d964ee382b04fbbe4

Particularly relavent here is the last chunk of that, which is part of
the automated test suite, which reproduces the issue by finding the
tightest possible packing.