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pidns: Outlaw thread creation after unshare(CLONE_NEWPID)
The sequence: unshare(CLONE_NEWPID) clone(CLONE_THREAD|CLONE_SIGHAND|CLONE_VM) Creates a new process in the new pid namespace without setting pid_ns->child_reaper. After forking this results in a NULL pointer dereference. Avoid this and other nonsense scenarios that can show up after creating a new pid namespace with unshare by adding a new check in copy_prodcess. Pointed-out-by: Oleg Nesterov <firstname.lastname@example.org> Acked-by: Oleg Nesterov <email@example.com> Signed-off-by: "Eric W. Biederman" <firstname.lastname@example.org>
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