[...]
HOWEVER, it still doesn't address more fundamental problem - somebody
creating a socket and passing it to you in SCM_RIGHTS datagram will
leave you with a socket you can do IO on, still tagged according to who
had created it.
AFAICS, the whole point of that exercise was to allow third-party changing
the priorities of traffic on sockets already created by a process we now
move to a different cgroup. Consider e.g. this:
Correct that is the point of the exercise.
To fix this specific case we could add a call to sock_update_netprioidx
in scm_recv to set the sk_cgrp_prioidx value.
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