linux-kernel - Re: [PATCH] nbd: restrict sockets to TCP and UDP

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Message-ID: <aRyzUc/WndKJBAz0@duo.ucw.cz>
Date: Tue, 18 Nov 2025 18:56:33 +0100
From: Pavel Machek <pavel@....cz>
To: Eric Dumazet <edumazet@...gle.com>
Cc: Josef Bacik <josef@...icpanda.com>, Jens Axboe <axboe@...nel.dk>,
	linux-kernel <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org,
	Eric Dumazet <eric.dumazet@...il.com>,
	syzbot+e1cd6bd8493060bd701d@...kaller.appspotmail.com,
	Mike Christie <mchristi@...hat.com>,
	"Richard W.M. Jones" <rjones@...hat.com>,
	Yu Kuai <yukuai1@...weicloud.com>, linux-block@...r.kernel.org,
	nbd@...er.debian.org
Subject: Re: [PATCH] nbd: restrict sockets to TCP and UDP

Hi!

> Recently, syzbot started to abuse NBD with all kinds of sockets.
> 
> Commit cf1b2326b734 ("nbd: verify socket is supported during setup")
> made sure the socket supported a shutdown() method.
> 
> Explicitely accept TCP and UNIX stream sockets.

Note that running nbd server and client on same machine is not safe in
read-write mode. It may deadlock under low memory conditions.

Thus I'm not sure if we should accept UNIX sockets.

Best regards,
								Pavel
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