kyverno.yaml

apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: pspallowedprocmounttypes
spec:
  validationFailureAction: Enforce
  rules:
    - name: check-proc-mount
      match:
        resources:
          kinds:
            - Pod
      validate:
        message: >-
          Changing the proc mount from the default is not allowed. The fields
          spec.containers[*].securityContext.procMount and
          spec.initContainers[*].securityContext.procMount and
          spec.ephemeralContainers[*].securityContext.procMount must not be changed
          from `Default`.
        pattern:
          spec:
            =(initContainers):
              - =(securityContext):
                  =(procMount): "Default"
            =(ephemeralContainers):
              - =(securityContext):
                  =(procMount): "Default"
            containers:
              - =(securityContext):
                  =(procMount): "Default"