From: Stephane Chazelas <stephane.chazelas@gmail.com>
To: linux-kernel@vger.kernel.org
Subject: network interfaces called "all", "default" or "config"
Date: Wed, 23 Jul 2014 12:33:14 +0100 [thread overview]
Message-ID: <20140723113314.GA7798@chaz.gmail.com> (raw)
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
next reply other threads:[~2014-07-23 11:33 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-23 11:33 Stephane Chazelas [this message]
2014-07-23 14:56 ` network interfaces called "all", "default" or "config" Randy Dunlap
2014-08-14 9:41 ` Stephane Chazelas
2014-08-14 18:28 ` Stephen Hemminger
2014-08-14 18:37 ` Cong Wang
2014-08-15 8:33 ` Stephane Chazelas
2014-08-15 17:32 ` Cong Wang
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