netdev - Re: [RFD] L2 Network namespace infrastructure

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Date:	Sat, 23 Jun 2007 14:31:52 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@....net>
Cc:	Patrick McHardy <kaber@...sh.net>, Jeff Garzik <jeff@...zik.org>,
	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>,
	netdev@...r.kernel.org, jamal <hadi@...erus.ca>,
	Linux Containers <containers@...ts.osdl.org>,
	Ben Greear <greearb@...delatech.com>,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	David Miller <davem@...emloft.net>
Subject: Re: [RFD] L2 Network namespace infrastructure

Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@....net> writes:

> Can one namespace DoS other namespaces' access to the routing cache?
> Two scenarios come to mind:
> * provoking hash collisions
> * lock contention (sorry, haven't checked whether/how we do locking)

My initial expectation is that the protections we have to prevent one user from
performing a DoS on another user generally cover the cases between namespaces as
well.

Further in general global caches and global resource management is more efficient
then per namespace management.

Eric
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