[Bug 2046844] Re: AppArmor user namespace creation restrictions cause many applications to crash with SIGTRAP

[John Johansen]

There is another improvement coming before prompt that may (it will
depend on the sandbox) also take care of many of the browser sandbox
issues, as well as a few other uses of unprivileged user namespaces. On
user namespace creation we will be able to transition the profile to a
new profile with a reduced set of privileges. Having a catch-all profile
that allows creation of user namespaces for a sandbox that doesn't need
any elevated privileges but is instead just being used to achieve, pid
and uid separation.

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Title:
  AppArmor user namespace creation restrictions cause many applications
  to crash with SIGTRAP

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