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Bug 1927551 - SELinux block systemd from running scripts in /usr/lib/systemd/system-sleep
Summary: SELinux block systemd from running scripts in /usr/lib/systemd/system-sleep
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: selinux-policy
Version: 8.3
Hardware: All
OS: Linux
medium
medium
Target Milestone: rc
: 8.5
Assignee: Zdenek Pytela
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-02-11 00:09 UTC by Orion Poplawski
Modified: 2021-11-10 08:31 UTC (History)
4 users (show)

Fixed In Version: selinux-policy-3.14.3-69.el8
Doc Type: No Doc Update
Doc Text:
Clone Of:
Environment:
Last Closed: 2021-11-09 19:42:58 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Bugzilla 1931460 1 medium CLOSED SELinux prevents hibernation (preventing systemd-sleep from getattr access to swap partition) 2023-09-02 14:23:17 UTC
Red Hat Product Errata RHBA-2021:4420 0 None None None 2021-11-09 19:43:20 UTC

Description Orion Poplawski 2021-02-11 00:09:16 UTC 
Description of problem:

I placed a script in /usr/lib/systemd/system-sleep but it does not get executed:

type=AVC msg=audit(1612929018.423:559): avc:  denied  { execute } for  pid=69804 comm="(direxec)" name="bitdefender-sleep" dev="dm-1" ino=138514047 scontext=system_u:system_r:systemd_sleep_t:s0 tcontext=system_u:object_r:bin_t:s0 tclass=file permissive=0

Feb 09 07:17:28 systemd[1]: Starting Suspend...
Feb 09 07:17:28 [133863]: Failed to execute /usr/lib/systemd/system-sleep/bitdefender-sleep: Permission denied
Feb 09 07:17:28 [133862]: /usr/lib/systemd/system-sleep/bitdefender-sleep failed with exit status 1.

Version-Release number of selected component (if applicable):
selinux-policy-3.14.3-54.el8_3.2.noarch

# ls -lZa /usr/lib/systemd/system-sleep
total 12
drwxr-xr-x.  2 root root system_u:object_r:bin_t:s0   31 Dec 17 16:30 ./
drwxr-xr-x. 16 root root system_u:object_r:lib_t:s0 4096 Jan  8 07:18 ../
-rwxr-xr-x.  1 root root system_u:object_r:bin_t:s0  150 Sep  5 10:49 bitdefender-sleep*


allow systemd_sleep_t systemd_sleep_exec_t:file { entrypoint execute getattr ioctl lock map open read };

Perhaps /usr/lib/systemd/system-sleep and it's contents should get labeled systemd_sleep_exec_t ?

FWIW - /usr/lib/systemd/system-shutdown is labeled lib_t instead of bin_t.

restorecon doesn't change any of these labels.
Comment 1 Orion Poplawski 2021-02-11 15:56:36 UTC 
Changing to lib_t doesn't help.  Changing to systemd_sleed_exec_t leads to a different denial:

avc:  denied  { getattr } for  pid=144222 comm="(sd-executor)" path="/usr/lib/systemd/system-sleep" dev="dm-1" ino=134845448 scontext=system_u:system_r:systemd_sleep_t:s0 tcontext=system_u:object_r:systemd_sleep_exec_t:s0 tclass=dir permissive=0
Comment 2 Zdenek Pytela 2021-04-19 20:56:33 UTC 
I've submitted a Fedora PR to address the issue:
https://github.com/fedora-selinux/selinux-policy/pull/612
Comment 13 errata-xmlrpc 2021-11-09 19:42:58 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 (selinux-policy bug fix and enhancement update), 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-2021:4420
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