unshare -r accidentally implies -u (UTS) instead of -U (user), and -r mapping is broken

[Denys Vlasenko]

Fixed, thanks!

On Sun, Nov 5, 2017 at 11:18 AM, Urja Rannikko <urjaman at gmail.com> wrote:
> Hi,
>
> On -r being broken:
> the uid_map and gid_map for the root mapping should be
> "0 %u 1" not "%u 0 1" (i think that tries to map the outside root to
> be your user id in the namespace... nope.)
>
> Noticed these while messing about with making an unprivileged user
> namespace... Both of these cause things to fail. And the root mapping
> can only be done by the process doing the unshare (exec drops
> privileges if you're not "root", so you end up stuck as nobody/65534).
>
> --
> Urja Rannikko
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