Fully numeric usernames in Focal

[Julian Andres Klode]

On Thu, Apr 08, 2021 at 06:58:36PM +0200, Victor Tapia wrote:
> Hi,
> 
> While reviewing a bug in Focal I noticed that useradd allows the creation
> of fully numeric usernames[1] but systemd does not like them[2]. This
> triggers issues in apps relying on systemd, such as gnome/gdm (returns to
> gdm after authenticating). For instance, after creating user 0, the user
> can log in via ssh or console but loginctl won't create a session for it:

It seems like a good idea to make useradd error out on such usernames
too, I suppose.


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