From: Eric W. Biederman <ebiederm@xmission.com>
Date: Tue, 21 Aug 2012 00:28:58 +0000 (-0700)
Subject: userns: Allow the userns root to mount of devpts
X-Git-Tag: v3.9-rc1~85^2~88
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ec2aa8e8dd7d35524a68c89b9e7ceb07fb002561;p=pandora-kernel.git

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>
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