linux-kernel - Re: [PATCH] cgroups: devices: add Documentation/ file

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Message-Id: <20080327085837.c51ebe6d.randy.dunlap@oracle.com>
Date:	Thu, 27 Mar 2008 08:58:37 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	"Serge E. Hallyn" <serue@...ibm.com>
Cc:	Andrew Morton <akpm@...l.org>, lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cgroups: devices: add Documentation/ file

On Thu, 27 Mar 2008 10:12:27 -0500 Serge E. Hallyn wrote:

> Fill a Documentation/controllers/devices.txt file with a
> modified text from the patch description.
> 
> Signed-off-by: Serge E. Hallyn <serue@...ibm.com>
> ---
>  Documentation/controllers/devices.txt |   48 +++++++++++++++++++++++++++++++++
>  1 files changed, 48 insertions(+), 0 deletions(-)
>  create mode 100644 Documentation/controllers/devices.txt
> 
> diff --git a/Documentation/controllers/devices.txt b/Documentation/controllers/devices.txt
> new file mode 100644
> index 0000000..a157f53
> --- /dev/null
> +++ b/Documentation/controllers/devices.txt
> @@ -0,0 +1,48 @@
> +Device Whitelist Controller
> +
> +1. Description:
> +

...

> +The root device cgroup starts with rwm to 'all'.  A child devices

                                                             device's

> +cgroup gets a copy of the parent.  Administrators can then remove
> +devices from the whitelist or add new entries.  A child cgroup can
> +never receive a device access which is denied its parent.  However
> +when a device access is removed from a parent it will not also be
> +removed from the child(ren).
> +
> +2. User Interface
> +
...
> +
> +3. Security
> +
> +Any task can move itself between cgroups.  This of clearly won't

s/of//

> +suffice, but we can decide the best way to adequately restrict
> +movement as people get some experience with this.  We may just want
> +to require CAP_SYS_ADMIN, which at least is a separate bit from
> +CAP_MKNOD.  We may want to just refuse moving to a cgroup which
> +isn't a descendent of the current one.  Or we may want to use
> +CAP_MAC_ADMIN, since we really are trying to lock down root.
> +
> +CAP_SYS_ADMIN is needed to modify the whitelist or move another
> +task to a new cgroup.  (Again we'll probably want to change that).
> +
> +A cgroup may not be granted more permissions than the cgroup's
> +parent has.  
> -- 

---
~Randy
--
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