tree e6dccae5db69231b9f7c4bd362bed2031de7516a
parent e11f0ae388f227d7ad03953e19034dec55286650
author Eric W. Biederman <ebiederm@xmission.com> 1345508938 -0700
committer Eric W. Biederman <ebiederm@xmission.com> 1359267741 -0800

userns: Allow the userns root to mount of devpts

- The context in which devpts is mounted has no effect on the creation
  of ptys as the /dev/ptmx interface has been used by unprivileged
  users for many years.

- Only support unprivileged mounts in combination with the newinstance
  option to ensure that mounting of /dev/pts in a user namespace will
  not allow the options of an existing mount of devpts to be modified.

- Create /dev/pts/ptmx as the root user in the user namespace that
  mounts devpts so that it's permissions to be changed.

Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>