linux-kernel - Re: [PATCH RESEND 0/4] device_cgroup: replace internally whitelist with exception list

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Message-ID: <20120816204913.GG28505@cathedrallabs.org>
Date:	Thu, 16 Aug 2012 16:49:13 -0400
From:	Aristeu Rozanski <aris@...vo.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	Tejun Heo <tj@...nel.org>, Li Zefan <lizefan@...wei.com>
Subject: Re: [PATCH RESEND 0/4] device_cgroup: replace internally whitelist
 with exception list

On Thu, Aug 16, 2012 at 01:08:44PM -0700, Andrew Morton wrote:
> On Thu, 09 Aug 2012 15:04:14 -0400
> aris@...vo.org wrote:
> 
> > The original model of device_cgroup is having a whitelist where all the
> > allowed devices are listed. The problem with this approach is that is
> > impossible to have the case of allowing everything but few devices.
> > 
> > The reason for that lies in the way the whitelist is handled internally:
> > since there's only a whitelist, the "all devices" entry would have to be
> > removed and replaced by the entire list of possible devices but the ones
> > that are being denied.  Since dev_t is 32 bits long, representing the allowed
> > devices as a bitfield is not memory efficient.
> > 
> > This patch replaces the "whitelist" by a "exceptions" list and the default
> > policy is kept as "deny_all" variable in dev_cgroup structure.
> 
> The patches look reasonable to me.  I suggest you resend them after
> kernel summit and cc a few additional people: Serge Hallyn, Pavel
> Emelyanov and James Morris.

thanks, will do. will include the checkpatch fixes as well.

-- 
Aristeu

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