login -f changing session getlogin(2)

[Jilles Tjoelker]

On Thu, Oct 01, 2015 at 03:02:21PM -0700, Bryan Drewery wrote:
> Can't we use something like forkpty(3) for the child to avoid the issues
> you mention? It calls setsid(2) via login_tty(3).

This would make sense for a special impersonation tool or for a paranoid
version of su, but not for a normal login.

You can do this right now using script(1), for example
  script /dev/null login -f SOMEUSER

-- 
Jilles Tjoelker