linux-kernel - network interfaces called "all", "default" or "config"

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Date:	Wed, 23 Jul 2014 12:33:14 +0100
From:	Stephane Chazelas <stephane.chazelas@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: network interfaces called "all", "default" or "config"

Hiya,

you may want to forbid the creation of interfaces whose name is
one of the special files in /proc/net and /proc/sys.

I can see some characters (like space, tab, newline, slash,
dot...) are alread forbidden in interface names (EINVAL), but
one can do for instance:

sudo ip link add link eth0 all type vlan id 2
sudo ip link add link eth0 default type vlan id 3
sudo ip link add link eth0 config type vlan id 4

Interestingly, after you add a "all" or "default", the
corresponding /proc/sys/net/ipv[46]/conf/(all|default) become
empty, and remain so even after you've removed the interface.

Adding an interface called "config" masks /proc/net/vlan/config

(tested with 3.14-1-amd64 on debian)

-- 
Stephane
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