Thoughts on tightening up user namespace creation

Andy Lutomirski luto at
Tue Mar 8 18:31:45 UTC 2016

On Mar 7, 2016 10:06 PM, "Serge E. Hallyn" <serge.hallyn at> wrote:
> On Mon, Mar 07, 2016 at 09:15:25PM -0800, Andy Lutomirski wrote:
> >  - Ubuntu requires CAP_SYS_ADMIN
> No, it does not.  It has temporarily re-added a sysctl which can enable
> that behavior, but it's not set by default.  The reason for providing it
> is not a distrust of user namespaces in general, but because we're enabling
> some bleeding edge patches which haven't been accepted upstream yet.  Once
> they're accepted upstream I expect that patch to be dropped again, unless
> it has gone upstream.
> Debian does afaik still have a version of a patch I'd originally written
> before user namespaces were upstream which defaulted unprivileged userns
> cloning to off.  Did you mean Debian here?

I meant Ubuntu 14.04, which I tested, possibly poorly.

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