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Bug 1919129

Summary: AVCs seen when using the GUI with confined users staff_u and sysadm_u
Product: Red Hat Enterprise Linux 8 Reporter: Renaud Métrich <rmetrich>
Component: selinux-policyAssignee: Zdenek Pytela <zpytela>
Status: CLOSED DUPLICATE QA Contact: BaseOS QE Security Team <qe-baseos-security>
Severity: low Docs Contact:
Priority: low    
Version: 8.3CC: lvrabec, mmalik, plautrba, ssekidde
Target Milestone: rcFlags: pm-rhel: mirror+
Target Release: 8.0   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: No Doc Update
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2021-01-22 20:15:08 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 1778780    
Attachments:
Description Flags
AVCs for staff user
none
AVCs for sysadm user none

Description Renaud Métrich 2021-01-22 08:23:06 UTC
Description of problem:

On systems with graphical interface, confined users encounter various AVCs:
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
allow staff_t pulseaudio_t:process2 nnp_transition;

allow sysadm_t fprintd_t:dbus send_msg;
allow sysadm_t realmd_t:dbus send_msg;

#!!!! This avc is allowed in the current policy
allow xdm_t sysadm_t:process transition;
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------


Version-Release number of selected component (if applicable):

selinux-policy-targeted-3.14.3-54.el8.noarch


How reproducible:

Always

Steps to Reproduce:
1. On a system with GUI, create "staff" and "sysadm" users

  # useradd -Z staff_u staff
  # echo "pass" | passwd --stdin staff
  # useradd -Z sysadm_u sysadm
  # echo "pass" | passwd --stdin sysadm

  # semanage boolean -m xdm_sysadm_login --on

2. Login as "staff" and "sysadm" users

Actual results:

AVCs above

Expected results:

No AVC

Comment 1 Renaud Métrich 2021-01-22 08:27:01 UTC
Created attachment 1749645 [details]
AVCs for staff user

Comment 2 Renaud Métrich 2021-01-22 08:27:27 UTC
Created attachment 1749646 [details]
AVCs for sysadm user

Comment 3 Zdenek Pytela 2021-01-22 20:15:08 UTC
Note the first denial has already been resolved:
bz#1854471

For the two following these bzs exist:
bz#1775923
bz#1775902

For the last one, the xdm_sysadm_login boolean needs to be turned on.

*** This bug has been marked as a duplicate of bug 1775923 ***