Bug below was reproduced on RHEL-7 too.

 This bug was initially created as a clone of Bug #1148376 +++

Description of problem:

Service openstack-nova-api is unable to start due to following AVC:
----
time->Wed Oct  1 06:03:52 2014
type=PROCTITLE msg=audit(1412157832.876:6839): proctitle=2F7573722F62696E2F707974686F6E002F7573722F62696E2F6E6F76612D617069
type=SYSCALL msg=audit(1412157832.876:6839): arch=c000003e syscall=137 success=no exit=-13 a0=7f9824cb58f6 a1=7fff06901d50 a2=1 a3=7fff06901ad0 items=0 ppid=1 pid=10879 auid=4294967295 uid=162 gid=162 euid=162 suid=162 fsuid=162 egid=162 sgid=162 fsgid=162 tty=(none) ses=4294967295 comm="nova-api" exe="/usr/bin/python2.7" subj=system_u:system_r:nova_api_t:s0 key=(null)
type=AVC msg=audit(1412157832.876:6839): avc:  denied  { getattr } for  pid=10879 comm="nova-api" name="/" dev="tmpfs" ino=8099 scontext=system_u:system_r:nova_api_t:s0 tcontext=system_u:object_r:tmpfs_t:s0 tclass=filesystem permissive=0


Version-Release number of selected component (if applicable):
selinux-policy-3.12.1-183.fc20.noarch
selinux-policy-targeted-3.12.1-183.fc20.noarch

Actual results:
When enforcing openstack-nova-api fails with following traceback:
2014-10-01 06:03:52.888 10879 CRITICAL nova [-] OSError: [Errno 38] Function not implemented
2014-10-01 06:03:52.888 10879 TRACE nova Traceback (most recent call last):
2014-10-01 06:03:52.888 10879 TRACE nova   File "/usr/bin/nova-api", line 10, in <module>
2014-10-01 06:03:52.888 10879 TRACE nova     sys.exit(main())
2014-10-01 06:03:52.888 10879 TRACE nova   File "/usr/lib/python2.7/site-packages/nova/cmd/api.py", line 55, in main
2014-10-01 06:03:52.888 10879 TRACE nova     server = service.WSGIService(api, use_ssl=should_use_ssl)
2014-10-01 06:03:52.888 10879 TRACE nova   File "/usr/lib/python2.7/site-packages/nova/service.py", line 331, in __init__
2014-10-01 06:03:52.888 10879 TRACE nova     self.manager = self._get_manager()
2014-10-01 06:03:52.888 10879 TRACE nova   File "/usr/lib/python2.7/site-packages/nova/service.py", line 383, in _get_manager
2014-10-01 06:03:52.888 10879 TRACE nova     return manager_class()
2014-10-01 06:03:52.888 10879 TRACE nova   File "/usr/lib/python2.7/site-packages/nova/api/manager.py", line 30, in __init__
2014-10-01 06:03:52.888 10879 TRACE nova     self.network_driver.metadata_accept()
2014-10-01 06:03:52.888 10879 TRACE nova   File "/usr/lib/python2.7/site-packages/nova/network/linux_net.py", line 666, in metadata_accept
2014-10-01 06:03:52.888 10879 TRACE nova     iptables_manager.apply()
2014-10-01 06:03:52.888 10879 TRACE nova   File "/usr/lib/python2.7/site-packages/nova/network/linux_net.py", line 434, in apply
2014-10-01 06:03:52.888 10879 TRACE nova     self._apply()
2014-10-01 06:03:52.888 10879 TRACE nova   File "/usr/lib/python2.7/site-packages/nova/openstack/common/lockutils.py", line 322, in inner
2014-10-01 06:03:52.888 10879 TRACE nova     with lock(name, lock_file_prefix, external, lock_path):
2014-10-01 06:03:52.888 10879 TRACE nova   File "/usr/lib64/python2.7/contextlib.py", line 17, in __enter__
2014-10-01 06:03:52.888 10879 TRACE nova     return self.gen.next()
2014-10-01 06:03:52.888 10879 TRACE nova   File "/usr/lib/python2.7/site-packages/nova/openstack/common/lockutils.py", line 287, in lock
2014-10-01 06:03:52.888 10879 TRACE nova     with ext_lock:
2014-10-01 06:03:52.888 10879 TRACE nova   File "/usr/lib/python2.7/site-packages/nova/openstack/common/lockutils.py", line 171, in __enter__
2014-10-01 06:03:52.888 10879 TRACE nova     self.acquire()
2014-10-01 06:03:52.888 10879 TRACE nova   File "/usr/lib/python2.7/site-packages/nova/openstack/common/lockutils.py", line 166, in acquire
2014-10-01 06:03:52.888 10879 TRACE nova     initial_value=1)
2014-10-01 06:03:52.888 10879 TRACE nova OSError: [Errno 38] Function not implemented
2014-10-01 06:03:52.888 10879 TRACE nova

Expected results:
When enforcing openstack-nova-api will start without problem.