Quoting Pavel Emelyanov (xemul@openvz.org):
> Hi, Cedric, Serge.
>
> I have noticed, that you have removed config options for
> uts and ipc namespaces but kept one for user namespace.
>
> What's the policy about what namespaces should have config
> option? I thought, that the only code that is worth having
> under option is clone/destroy one to save .text size for
> people who don't need them (embedded).

The user namespaces are under a config and marked experimental because
uid-based permission checks do not take namespaces into account and the
root user in a namespace is not at all controlled.  You can handle the
security implications using selinux, but I guess the fear is that people
would assume uid namespaces do more than they currently do.

-serge
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