audit: queue netlink multicast sends just like we do for unicast sends
Sending audit netlink multicast messages is bad for all the same
reasons that sending audit netlink unicast messages is bad, so this
patch reworks things so that we don't do the multicast send in
audit_log_end(), we do it from the dedicated kauditd_thread thread just
as we do for unicast messages.
See the GitHub issues below for more information/history:
* https://github.com/linux-audit/audit-kernel/issues/23
* https://github.com/linux-audit/audit-kernel/issues/22
Signed-off-by: Paul Moore <paul@paul-moore.com>
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