[Bug 1244635] Re: setuid executables in a container may compromise security on the host

[Stéphane Graber]

For those users, getting back to the old way would be a chmod away and I
asked Serge to make sure permissions would only be changed once and not
with every update, so it should be a one time thing.

As for security, while we don't currently say LXC is secure on Ubuntu,
we're not aware of any way to escape a default container (Ubuntu on
Ubuntu) starting with 12.04 when running with all default settings
(specifically, under apparmor). If you know of a way to do so, I'd love
to hear about it so we can adapt our apparmor profile to prevent it.

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Title:
  setuid executables in a container may compromise security on the host

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