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Description of problem:
SELinux-confined users cannot run /bin/systemd-tmpfiles, because no policy rule exists to allow sysadm_t to execute files labeled systemd_tmpfiles_exec_t:

[dhatch@c7-1ea498 ~]$ sudo -r sysadm_r systemd-tmpfiles --create
sesh: unable to execute /bin/systemd-tmpfiles: Permission denied

type=AVC msg=audit(1460124637.840:85): avc:  denied  { execute } for  pid=873 comm="sesh" name="systemd-tmpfiles" dev="dm-0" ino=25553816 scontext=staff_u:sysadm_r:sysadm_t:s0-s15:c0.c1023 tcontext=system_u:object_r:systemd_tmpfiles_exec_t:s0 tclass=file

Administrators should be allowed to run this command to apply any changes they may have made to configuration in /etc/tmpfiles.d. 

Version-Release number of selected component (if applicable):
selinux-policy-mls-3.13.1-60.el7_2.3.noarch

Fixed in Fedora, we need to back port this.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:0763