[Bug 82531] Nondumpable processes that are sandboxed with CLONE_NEWUSER can be ptraced from outside.

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https://bugzilla.kernel.org/show_bug.cgi?id=82531

--- Comment #6 from Jann Horn <jann+kernelbugzilla@xxxxxxxxx> ---
For a process that wants to drop privileges and enter a new user namespace for
security, it might make sense to first set up the namespace as uid 0, with all
UIDs mapped, and then drop privileges inside the user namespace.

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