Node degraded due to mode mismatch for file in Openshift 4

Issue

• How to edit the machineconfiguration file to set mode parameter when creating or editing machineconfig object ?
• Which data type is supported for setting mode?

$ oc describe mcp worker

 Reason:

 Message:               Node worker-0.abc.example.com is reporting: "unexpected on-disk state validating against rendered-worker-d0747f04f0eb7d6eba9ffb1ea7e765c2"
    Reason:                1 nodes are reporting degraded status on sync
    Status:                True
    Type:                  NodeDegraded
    Last Transition Time:  2020-02-03T06:25:15Z
    Message:               
    Reason:                
    Status:                True
    Type:                  Degraded

• Logs from machine-config-daemon pods show:

$ oc logs machine-config-daemon-XXXXX     // pod running on degraded node
I0203 06:25:01.780861    2611 daemon.go:889] Validating against pending config rendered-worker-d0747f04f0eb7d6eba9ffb1ea7e765c2
E0203 06:25:01.793256    2611 daemon.go:1263] mode mismatch for file: "/etc/chrony.conf"; expected: -r-----rwx; received: -r-----rwx
E0203 06:25:01.793586    2611 writer.go:127] Marking Degraded due to: unexpected on-disk state validating against rendered-worker-d0747f04f0eb7d6eba9ffb1ea7e765c2