RealtimeKit and the audio problem

1. Malicious software exploits some other vulnerability first, in which case rtkit or PAM limits are unlikely to do any good anyway.

2. A naive user clicks a link or opens an email with malicious code. Correct me if I'm wrong, but I'm under the impression that neither Firefox nor Thunderbird are usually run with real-time permissions?

3. A user runs malicious code they crafted themselves. It should go without saying that in this instance, real-time priority inheritance is the very least of the administrator's worries.