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Message-ID: <53CFCD26.1020409@infradead.org> Date: Wed, 23 Jul 2014 07:56:38 -0700 From: Randy Dunlap <rdunlap@...radead.org> To: Stephane Chazelas <stephane.chazelas@...il.com>, linux-kernel@...r.kernel.org, "netdev@...r.kernel.org" <netdev@...r.kernel.org> Subject: Re: network interfaces called "all", "default" or "config" [adding netdev] On 07/23/2014 04:33 AM, Stephane Chazelas wrote: > 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) > -- ~Randy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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