Re: [PATCH 2/2] user namespaces: require cap_set{ug}id for CLONE_NEWUSER

From: Eric W. Biederman
Date: Fri Dec 05 2008 - 12:26:36 EST

"Serge E. Hallyn" <serue@xxxxxxxxxx> writes:

>> Personally the user namespace only becomes interesting when we
>> start to be able to move in the other direction and remove the
>> set of capabilities requires to create it.
>> Eric
> Agreed. Now the thing is I don't think we need full userns
> support to get there. We just need the targeted capabilities
> and the basic dummy fs support - that is, init_user_ns owns
> all vfsmounts, and anyone not in init_user_ns only gets
> user other access to files under those mounts.


> Of course complete support for targeted caps will in itself
> be a huge effort :)
> So my roadmap is: next address the per-user keyring, then
> the targeted caps.

Sounds good.

I expect this means we will pass through a period where the user
namespace is less useful than it is today. But as it will be on
a much firmer foundation that is fine.


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