[SRU T, U, V, W] sysctl to disable unprivileged user namespace unsharing

[Kamal Mostafa]

From: Kamal Mostafa <kamal at canonical.com>

Mitigation of unprivileged user namespaces vulnerability.

BugLink: https://bugs.launchpad.net/bugs/1595350

This patch is taken from Xenial (cherry pick for wily; trivial context
backport for T, U, V).

 -Kamal

-----

Serge Hallyn (1):
  UBUNTU: SAUCE: add a sysctl to disable unprivileged user namespace
    unsharing

 kernel/fork.c           | 15 +++++++++++++++
 kernel/sysctl.c         | 12 ++++++++++++
 kernel/user_namespace.c |  6 ++++++
 3 files changed, 33 insertions(+)

-- 
2.7.4