Attempt to address https://github.com/systemd/systemd/issues/20330#issuecomment-1210028422. Summary of the comment: Unprivileged users can potentially cause a denial of service during systemd-oomd unit subscriptions by spamming requests to SubscribeManagedOOMCGroups. As systemd-oomd.service is the only unit that should be accessing this method, add a check on the caller's unit name to deter them from successfully using this method.
System and Service Manager
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