NS autolabeler requires RoleBinding subject namespace to be set when using ServiceAccount

This is a clone of issue OCPBUGS-160. The following is the description of the original issue:
—
Description of problem:

The NS autolabeler should adjust the PSS namespace labels such that a previously permitted workload (based on the SCCs it has access to) can still run.

The autolabeler requires the RoleBinding's .subjects[].namespace to be set when .subjects[].kind is ServiceAccount even though this is not required by the RBAC system to successfully bind the SA to a Role

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

$ oc version
Client Version: 4.7.0-0.ci-2021-05-21-142747
Server Version: 4.12.0-0.nightly-2022-08-15-150248
Kubernetes Version: v1.24.0+da80cd0

How reproducible: 100%

Steps to Reproduce:

---
apiVersion: v1
kind: Namespace
metadata:
  name: test

---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: mysa
  namespace: test

---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  name: myrole
  namespace: test
rules:
- apiGroups:
  - security.openshift.io
  resourceNames:
  - privileged
  resources:
  - securitycontextconstraints
  verbs:
  - use

---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: myrb
  namespace: test
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: myrole
subjects:
- kind: ServiceAccount
  name: mysa
  #namespace: test  # This is required for the autolabeler

---
kind: Job
apiVersion: batch/v1
metadata:
  name: myjob
  namespace: test
spec:
  template:
    spec:
      containers:
        - name: ubi
          image: registry.access.redhat.com/ubi8
          command: ["/bin/bash", "-c"]
          args: ["whoami; sleep infinity"]
      restartPolicy: Never
      securityContext:
        runAsUser: 0
      serviceAccount: mysa
      terminationGracePeriodSeconds: 2
{{}}

Actual results:

Applying the manifest, above, the Job's pod will not start:

$ kubectl -n test describe job/myjob...Events:
  Type     Reason        Age   From            Message
  ----     ------        ----  ----            -------
  Warning  FailedCreate  20s   job-controller  Error creating: pods "myjob-zxcvv" is forbidden: violates PodSecurity "restricted:v1.24": allowPrivilegeEscalation != false (container "ubi" must set securityContext.allowPrivilegeEscalation=false), unrestricted capabilities (container "ubi" must set securityContext.capabilities.drop=["ALL"]), runAsNonRoot != true (pod or container "ubi" must set securityContext.runAsNonRoot=true), runAsUser=0 (pod must not set runAsUser=0), seccompProfile (pod or container "ubi" must set securityContext.seccompProfile.type to "RuntimeDefault" or "Localhost")
  Warning  FailedCreate  20s   job-controller  Error creating: pods "myjob-fkb9x" is forbidden: violates PodSecurity "restricted:v1.24": allowPrivilegeEscalation != false (container "ubi" must set securityContext.allowPrivilegeEscalation=false), unrestricted capabilities (container "ubi" must set securityContext.capabilities.drop=["ALL"]), runAsNonRoot != true (pod or container "ubi" must set securityContext.runAsNonRoot=true), runAsUser=0 (pod must not set runAsUser=0), seccompProfile (pod or container "ubi" must set securityContext.seccompProfile.type to "RuntimeDefault" or "Localhost")
  Warning  FailedCreate  10s   job-controller  Error creating: pods "myjob-5klpc" is forbidden: violates PodSecurity "restricted:v1.24": allowPrivilegeEscalation != false (container "ubi" must set securityContext.allowPrivilegeEscalation=false), unrestricted capabilities (container "ubi" must set securityContext.capabilities.drop=["ALL"]), runAsNonRoot != true (pod or container "ubi" must set securityContext.runAsNonRoot=true), runAsUser=0 (pod must not set runAsUser=0), seccompProfile (pod or container "ubi" must set securityContext.seccompProfile.type to "RuntimeDefault" or "Localhost")

Uncommenting the "namespace" field in the RoleBinding will allow it to start as the autolabeler will adjust the Namespace labels.

However, the namespace field isn't actually required by the RBAC system. Instead of using the autolabeler, the pod can be allowed to run by (w/o uncommenting the field):

$ kubectl label ns/test security.openshift.io/scc.podSecurityLabelSync=false
namespace/test labeled
$ kubectl label ns/test pod-security.kubernetes.io/enforce=privileged --overwrite
namespace/test labeled

We now see that the pod is running as root and has access to the privileged scc:

$ kubectl -n test get po -oyaml
apiVersion: v1
items:
- apiVersion: v1
  kind: Pod
  metadata:
    annotations:
      k8s.ovn.org/pod-networks: '{"default":{"ip_addresses":["10.129.2.18/23"],"mac_address":"0a:58:0a:81:02:12","gateway_ips":["10.129.2.1"],"ip_address":"10.129.2.18/23","gateway_ip":"10.129.2.1"'}}
      k8s.v1.cni.cncf.io/network-status: |-
        [{
            "name": "ovn-kubernetes",
            "interface": "eth0",
            "ips": [
                "10.129.2.18"
            ],
            "mac": "0a:58:0a:81:02:12",
            "default": true,
            "dns": {}
        }]
      k8s.v1.cni.cncf.io/networks-status: |-
        [{
            "name": "ovn-kubernetes",
            "interface": "eth0",
            "ips": [
                "10.129.2.18"
            ],
            "mac": "0a:58:0a:81:02:12",
            "default": true,
            "dns": {}
        }]
      openshift.io/scc: privileged
    creationTimestamp: "2022-08-16T13:08:24Z"
    generateName: myjob-
    labels:
      controller-uid: 1867dbe6-73b2-44ea-a324-45c9273107b8
      job-name: myjob
    name: myjob-rwjmv
    namespace: test
    ownerReferences:
    - apiVersion: batch/v1
      blockOwnerDeletion: true
      controller: true
      kind: Job
      name: myjob
      uid: 1867dbe6-73b2-44ea-a324-45c9273107b8
    resourceVersion: "36418"
    uid: 39f18dea-31d4-4783-85b5-8ae6a8bec1f4
  spec:
    containers:
    - args:
      - whoami; sleep infinity
      command:
      - /bin/bash
      - -c
      image: registry.access.redhat.com/ubi8
      imagePullPolicy: Always
      name: ubi
      resources: {}
      terminationMessagePath: /dev/termination-log
      terminationMessagePolicy: File
      volumeMounts:
      - mountPath: /var/run/secrets/kubernetes.io/serviceaccount
        name: kube-api-access-6f2h6
        readOnly: true
    dnsPolicy: ClusterFirst
    enableServiceLinks: true
    imagePullSecrets:
    - name: mysa-dockercfg-mvmtn
    nodeName: ip-10-0-140-172.ec2.internal
    preemptionPolicy: PreemptLowerPriority
    priority: 0
    restartPolicy: Never
    schedulerName: default-scheduler
    securityContext:
      runAsUser: 0
    serviceAccount: mysa
    serviceAccountName: mysa
    terminationGracePeriodSeconds: 2
    tolerations:
    - effect: NoExecute
      key: node.kubernetes.io/not-ready
      operator: Exists
      tolerationSeconds: 300
    - effect: NoExecute
      key: node.kubernetes.io/unreachable
      operator: Exists
      tolerationSeconds: 300
    volumes:
    - name: kube-api-access-6f2h6
      projected:
        defaultMode: 420
        sources:
        - serviceAccountToken:
            expirationSeconds: 3607
            path: token
        - configMap:
            items:
            - key: ca.crt
              path: ca.crt
            name: kube-root-ca.crt
        - downwardAPI:
            items:
            - fieldRef:
                apiVersion: v1
                fieldPath: metadata.namespace
              path: namespace
        - configMap:
            items:
            - key: service-ca.crt
              path: service-ca.crt
            name: openshift-service-ca.crt
  status:
    conditions:
    - lastProbeTime: null
      lastTransitionTime: "2022-08-16T13:08:24Z"
      status: "True"
      type: Initialized
    - lastProbeTime: null
      lastTransitionTime: "2022-08-16T13:08:28Z"
      status: "True"
      type: Ready
    - lastProbeTime: null
      lastTransitionTime: "2022-08-16T13:08:28Z"
      status: "True"
      type: ContainersReady
    - lastProbeTime: null
      lastTransitionTime: "2022-08-16T13:08:24Z"
      status: "True"
      type: PodScheduled
    containerStatuses:
    - containerID: cri-o://8fd1c3a5ee565a1089e4e6032bd04bceabb5ab3946c34a2bb55d3ee696baa007
      image: registry.access.redhat.com/ubi8:latest
      imageID: registry.access.redhat.com/ubi8@sha256:08e221b041a95e6840b208c618ae56c27e3429c3dad637ece01c9b471cc8fac6
      lastState: {}
      name: ubi
      ready: true
      restartCount: 0
      started: true
      state:
        running:
          startedAt: "2022-08-16T13:08:28Z"
    hostIP: 10.0.140.172
    phase: Running
    podIP: 10.129.2.18
    podIPs:
    - ip: 10.129.2.18
    qosClass: BestEffort
    startTime: "2022-08-16T13:08:24Z"
kind: List
metadata:
  resourceVersion: ""
{{}}

$ kubectl -n test logs job/myjob
root

Expected results:

The autolabeler should properly follow the RoleBinding back to the SCC

Additional info: