netdev - Re: [PATCH net-net 0/4] Increase the limit of tuntap queues

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Message-Id: <20141123.202321.1426718936320546377.davem@davemloft.net>
Date:	Sun, 23 Nov 2014 20:23:21 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	mst@...hat.com
Cc:	pagupta@...hat.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, jasowang@...hat.com, dgibson@...hat.com,
	vfalico@...il.com, edumazet@...gle.com, vyasevic@...hat.com,
	hkchu@...gle.com, wuzhy@...ux.vnet.ibm.com, xemul@...allels.com,
	therbert@...gle.com, bhutchings@...arflare.com, xii@...gle.com,
	stephen@...workplumber.org, jiri@...nulli.us,
	sergei.shtylyov@...entembedded.com
Subject: Re: [PATCH net-net 0/4] Increase the limit of tuntap queues

From: "Michael S. Tsirkin" <mst@...hat.com>
Date: Sun, 23 Nov 2014 22:30:32 +0200

> qemu runs in the host, but it's unpriveledged: it gets
> passed tun FDs by a priveledged daemon, and it only
> has the rights to some operations,
> in particular to attach and detach queues.
> 
> The assumption always was that this operation is safe
> and can't make kernel run out of resources.

This creates a rather rediculous situation in my opinion.

Configuring a network device is a privileged operation, the daemon
should be setting this thing up.

In no other context would we have to worry about something like this.
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