Bug 1496564 - SELinux is preventing lightdm from using the 'dac_override' capabilities.
Summary: SELinux is preventing lightdm from using the 'dac_override' capabilities.
Alias: None
Product: Fedora
Classification: Fedora
Component: selinux-policy
Version: rawhide
Hardware: x86_64
OS: Unspecified
Target Milestone: ---
Assignee: Lukas Vrabec
QA Contact: Fedora Extras Quality Assurance
Whiteboard: abrt_hash:b7090ab274333268594ae5a38a5...
Depends On:
TreeView+ depends on / blocked
Reported: 2017-09-27 19:03 UTC by Gene Snider
Modified: 2018-02-20 11:24 UTC (History)
6 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Last Closed: 2018-02-20 11:24:23 UTC
Type: ---

Attachments (Terms of Use)

Description Gene Snider 2017-09-27 19:03:32 UTC
Description of problem:
SELinux is preventing lightdm from using the 'dac_override' capabilities.

*****  Plugin dac_override (91.4 confidence) suggests   **********************

If if you want to help identify if domain needs this access or you have a file with the wrong permissions on your system
Then turn on full auditing to get path information about the offending file and generate the error again.

Turn on full auditing
# auditctl -w /etc/shadow -p w
Try to recreate AVC. Then execute
# ausearch -m avc -ts recent
If you see PATH record check ownership/permissions on file, and fix it,
otherwise report as a bugzilla.

*****  Plugin catchall (9.59 confidence) suggests   **************************

If if you believe that lightdm should have the dac_override capability by default.
Then you should report this as a bug.
You can generate a local policy module to allow this access.
allow this access for now by executing:
# ausearch -c 'lightdm' --raw | audit2allow -M my-lightdm
# semodule -X 300 -i my-lightdm.pp

Additional Information:
Source Context                system_u:system_r:xdm_t:s0-s0:c0.c1023
Target Context                system_u:system_r:xdm_t:s0-s0:c0.c1023
Target Objects                Unknown [ capability ]
Source                        lightdm
Source Path                   lightdm
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           
Policy RPM                    selinux-policy-3.13.1-288.fc28.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Permissive
Host Name                     (removed)
Platform                      Linux (removed) 4.14.0-0.rc2.git0.1.fc28.x86_64 #1
                              SMP Mon Sep 25 12:59:54 UTC 2017 x86_64 x86_64
Alert Count                   1
First Seen                    2017-09-27 12:01:24 PDT
Last Seen                     2017-09-27 12:01:24 PDT
Local ID                      8aab5604-a458-4952-a8a4-21544212d891

Raw Audit Messages
type=AVC msg=audit(1506538884.60:188): avc:  denied  { dac_override } for  pid=609 comm="lightdm" capability=1  scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tclass=capability permissive=1

Hash: lightdm,xdm_t,xdm_t,capability,dac_override

Version-Release number of selected component:

Additional info:
component:      selinux-policy
reporter:       libreport-2.9.2
hashmarkername: setroubleshoot
kernel:         4.14.0-0.rc2.git0.1.fc28.x86_64
type:           libreport

Note You need to log in before you can comment on or make changes to this bug.