Bug 1316724 - SELinux prevents kdm from accessing /sbin/poweroff
Summary: SELinux prevents kdm from accessing /sbin/poweroff
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: selinux-policy
Version: 7.2
Hardware: All
OS: Linux
medium
low
Target Milestone: rc
: ---
Assignee: Lukas Vrabec
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2016-03-10 22:14 UTC by Orion Poplawski
Modified: 2016-11-04 02:44 UTC (History)
7 users (show)

Fixed In Version: selinux-policy-3.13.1-69.el7
Doc Type: Bug Fix
Doc Text:
Clone Of:
: 1330970 (view as bug list)
Environment:
Last Closed: 2016-11-04 02:44:40 UTC
Target Upstream Version:


Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2016:2283 0 normal SHIPPED_LIVE selinux-policy bug fix and enhancement update 2016-11-03 13:36:25 UTC

Description Orion Poplawski 2016-03-10 22:14:12 UTC
Description of problem:

type=USER_AVC msg=audit(1457620723.473:779): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='avc:  denied  { status } for auid=n/a uid=0 gid=0 path="/usr/lib/systemd/system/poweroff.target" cmdline="/sbin/poweroff" scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:power_unit_file_t:s0 tclass=service  exe="/usr/lib/systemd/systemd" sauid=0 hostname=? addr=? terminal=?'

I suspect this interferes with kdm's shutdown ability, but haven't tested.

See also bug #951039

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

Comment 2 Miroslav Grepl 2016-03-14 08:16:09 UTC
Orion,
could test a local policy to see if you are able to do shutdown?

---

policy_module(myxdm, 1.0)

require {
	type xdm_t;
}

#============= xdm_t ==============
systemd_status_power_services(xdm_t)

---

# make -f /usr/share/selinux/devel/Makefile myxdm.pp
# semodule -i myxdm.pp

Comment 3 Orion Poplawski 2016-03-23 20:08:23 UTC
So it turns out that it doesn't prevent kdm from being able to do a shutdown, so not a real problem.  Addid myxdm does remove the denial though.

Comment 4 Miroslav Grepl 2016-03-31 06:41:18 UTC
Are you getting any AVCs?

Comment 5 Orion Poplawski 2016-03-31 14:27:36 UTC
Not after adding myxdm.pp.

Comment 10 errata-xmlrpc 2016-11-04 02:44:40 UTC
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://rhn.redhat.com/errata/RHBA-2016-2283.html


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