My opinion on how this could go:

- integrate changes for cosmic soon, deploy the blacklist variant as
soon as practical. Beg and cajole people to test and report results.
(Does this require a feature freeze exception bug?)

- handle bionic and earlier via SRU process -- this feels like a
significant regression risk, and the consequences of it could be pretty
severe for our users. Not all kernels will log seccomp denials either,
making it extremely difficult to track down the root cause of potential
regressions.

- we might not want to turn on even the blacklist variant by default in
bionic and earlier due to the risk of regressions. We can always turn it
on after cosmic has shipped and seen wider use.

Thanks

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https://bugs.launchpad.net/bugs/1789551

Title:
  qemu: CVE-2018-15746: seccomp: blacklist is not applied to all threads

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