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

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Message-Id: <20120816130844.6f26530d.akpm@linux-foundation.org>
Date:	Thu, 16 Aug 2012 13:08:44 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	aris@...vo.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, 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.
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