kyverno/samples/best_practices/disallow_priviledged_priviligedescalation.yaml

apiVersion: kyverno.io/v1alpha1
kind: ClusterPolicy
metadata:
  name: validate-deny-privileged-priviligedescalation
  annotations:
    policies.kyverno.io/category: Security Context
    policies.kyverno.io/description: Privileged containers are defined as any container 
      where the container uid 0 is mapped to the host’s uid 0. A process within privileged 
      containers can get unrestricted host access. With 'securityContext.allowPrivilegeEscalation' 
      enabled a process can gain privileges from its parent. To disallow privileged containers 
      and the escalation of privileges it is recommended to run pod containers with 
      'securityContext.priveleged' as 'false' and 'allowPrivilegeEscalation' as 'false'.
spec:
  rules:
  - name: deny-privileged-priviligedescalation
    match:
      resources:
        kinds:
        - Pod
    validate:
      message: "Privileged mode is not allowed. Set allowPrivilegeEscalation and privileged to false"
      anyPattern:
      - spec:
          securityContext:
            allowPrivilegeEscalation: false
            privileged: false
      - spec:
          containers:
          - name: "*"
            securityContext:
              allowPrivilegeEscalation: false
              privileged: false