[Bug 1263738] Re: login console 0 in user namespace container is not configured right

[Serge Hallyn]

Quoting Joseph Salisbury (joseph.salisbury at canonical.com):
> One additional question, do you happen to know if this is a regression?
> Did this not happen with previous releases/kernels?

This is not a regression, it has never worked right.

We believe the problem is that if a task is !dumpable, then the kernel
marks some of its /proc/pid files as owned by the global host root,
which is not mapped into a user namespace.  If that is the case, then
the question is whether it is safe to mark them owned by the container
root; or whether we can distinguish between tasks which became dumpable
before switching namespaces; or whether there is something else we can
do.

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https://bugs.launchpad.net/bugs/1263738

Title:
  login console 0 in user namespace container is not configured right

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