linux-kernel - Re: [RFC] cgroups: implement device whitelist lsm (v2)

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Message-ID: <47DA94CE.9090101@openvz.org>
Date:	Fri, 14 Mar 2008 18:07:58 +0300
From:	Pavel Emelyanov <xemul@...nvz.org>
To:	"Serge E. Hallyn" <serue@...ibm.com>
CC:	James Morris <jmorris@...ei.org>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-security-module@...r.kernel.org, Greg KH <greg@...ah.com>,
	Stephen Smalley <sds@...ch.ncsc.mil>,
	Casey Schaufler <casey@...aufler-ca.com>
Subject: Re: [RFC] cgroups: implement device whitelist lsm (v2)

[snip]

>> The # of rules usually has a linear dependency on the number of containers
>> (each of then has to have an access to /dev/null,zero,random at least), so
>> having 100 containers we will have to scan through a 300-entries list.
> 
> Oh no, the rules are stored per-container, so it sounds like you're
> saying 3 entries per container?

Oops :) I've missed that part :(

>> I'd
>> vote for a hash table or a radix/binary/rb tree for that. Or any other way
>> for non-linear search you can provide :)
> 
> I'm fine with that, but not for 3 rules  :)

So am I :) Anyway - if someday this will grow up to tens of entries turning
it into a more scalable lookup would be easy.

> -serge
> 

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