unnecessary log output in selinux_status_updated

[Petr Lautrbach <plautrba@redhat.com>]

Hi,


Commit 05bdc03130d74 ("libselinux: use kernel status page by default") changed
selinux_status_updated() so that it calls avc_process_policyload() and
avc_process_setenforce() and both functions call avc_log() and avc_log() logs to
stderr by default. So when a process like `rpm` checks whether there was a
change, it gets output on stderr which previously wasn't there.


Before this change:
>>> from selinux import *
>>> selinux_status_open(0);
0
>>> 
>>> selinux_status_updated();
0
>>> selinux_mkload_policy(0);
0
>>> selinux_status_updated();
1

Current version:
>>> from selinux import *
elinux_status_updated();
selinux_mkload_policy(0);
selinux_status_updated();
>>> selinux_status_open(0);
0
>>> selinux_status_updated();
0
>>> selinux_mkload_policy(0);
0
>>> selinux_status_updated();
uavc:  op=load_policy lsm=selinux seqno=2 res=11


The calling process could set its callback but it seems unnecessarily
complicated just for selinux_status_updated() which is supposed to check whether
something has changed or not. Also processing events in this function seems to
be unnecessary.

It looks like the reason for the new code added to selinux_status_updated() is
that there were several avc_netlink_check_nb() calls replaced by
selinux_status_updated(). Given the problem described above, I don't think it's
correct and I would like to change selinux_status_updated() back and use another
mechanism that would help with the replacement.


So what do you think about it?


Petr