firejail , https://firejail.wordpress.com/

can be used to restrict and/or contexualize a process with namespaces. i was 
thinking of restricting ssh connections with it to prevent the free privilege 
escalation qubes gives malicious apps in case of an exploitable hole in ssh. 
but, firejail itself is more code to exploit, and though it matters less in 
qubes, setuid. 

so what thinks all of you? worth the extra attack surface?

was also thinking of using firejails logging to flag attempts at sudo etc as 
another means to flag a host with problems. this again, means extra code that 
itself could be exploited. 

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