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https://github.com/k3s-io/kubernetes.git
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Merge pull request #116723 from SergeyKanzhelev/ExperimentalHostUserNamespaceDefaulting
deprecate ExperimentalHostUserNamespaceDefaulting
This commit is contained in:
Kubernetes Prow Robot
GitHub
commit
74ad7c397d
@ -294,10 +294,9 @@ const (
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// owner: @pweil-
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// alpha: v1.5
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// deprecated: v1.28
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//
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// Default userns=host for containers that are using other host namespaces, host mounts, the pod
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// contains a privileged container, or specific non-namespaced capabilities (MKNOD, SYS_MODULE,
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// SYS_TIME). This should only be enabled if user namespace remapping is enabled in the docker daemon.
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// This flag used to be needed for dockershim CRI and currently does nothing.
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ExperimentalHostUserNamespaceDefaultingGate featuregate.Feature = "ExperimentalHostUserNamespaceDefaulting"
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// owner: @yuzhiquan, @bowei, @PxyUp, @SergeyKanzhelev
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@ -998,7 +997,7 @@ var defaultKubernetesFeatureGates = map[featuregate.Feature]featuregate.FeatureS
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ExpandedDNSConfig: {Default: true, PreRelease: featuregate.Beta},
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ExperimentalHostUserNamespaceDefaultingGate: {Default: false, PreRelease: featuregate.Beta},
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ExperimentalHostUserNamespaceDefaultingGate: {Default: false, PreRelease: featuregate.Deprecated, LockToDefault: true}, // remove in 1.30
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GRPCContainerProbe: {Default: true, PreRelease: featuregate.GA, LockToDefault: true}, //remove in 1.29
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@ -480,12 +480,6 @@ type RunContainerOptions struct {
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ReadOnly bool
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// hostname for pod containers
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Hostname string
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// EnableHostUserNamespace sets userns=host when users request host namespaces (pid, ipc, net),
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// are using non-namespaced capabilities (mknod, sys_time, sys_module), the pod contains a privileged container,
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// or using host path volumes.
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// This should only be enabled when the container runtime is performing user remapping AND if the
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// experimental behavior is desired.
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EnableHostUserNamespace bool
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}
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// VolumeInfo contains information about the volume.
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@ -517,56 +517,55 @@ func NewMainKubelet(kubeCfg *kubeletconfiginternal.KubeletConfiguration,
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tracer := kubeDeps.TracerProvider.Tracer(instrumentationScope)
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klet := &Kubelet{
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hostname: hostname,
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hostnameOverridden: hostnameOverridden,
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nodeName: nodeName,
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kubeClient: kubeDeps.KubeClient,
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heartbeatClient: kubeDeps.HeartbeatClient,
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onRepeatedHeartbeatFailure: kubeDeps.OnHeartbeatFailure,
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rootDirectory: filepath.Clean(rootDirectory),
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resyncInterval: kubeCfg.SyncFrequency.Duration,
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sourcesReady: config.NewSourcesReady(kubeDeps.PodConfig.SeenAllSources),
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registerNode: registerNode,
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registerWithTaints: registerWithTaints,
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registerSchedulable: registerSchedulable,
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dnsConfigurer: dns.NewConfigurer(kubeDeps.Recorder, nodeRef, nodeIPs, clusterDNS, kubeCfg.ClusterDomain, kubeCfg.ResolverConfig),
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serviceLister: serviceLister,
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serviceHasSynced: serviceHasSynced,
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nodeLister: nodeLister,
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nodeHasSynced: nodeHasSynced,
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streamingConnectionIdleTimeout: kubeCfg.StreamingConnectionIdleTimeout.Duration,
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recorder: kubeDeps.Recorder,
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cadvisor: kubeDeps.CAdvisorInterface,
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cloud: kubeDeps.Cloud,
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externalCloudProvider: cloudprovider.IsExternal(cloudProvider),
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providerID: providerID,
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nodeRef: nodeRef,
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nodeLabels: nodeLabels,
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nodeStatusUpdateFrequency: kubeCfg.NodeStatusUpdateFrequency.Duration,
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nodeStatusReportFrequency: kubeCfg.NodeStatusReportFrequency.Duration,
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os: kubeDeps.OSInterface,
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oomWatcher: oomWatcher,
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cgroupsPerQOS: kubeCfg.CgroupsPerQOS,
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cgroupRoot: kubeCfg.CgroupRoot,
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mounter: kubeDeps.Mounter,
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hostutil: kubeDeps.HostUtil,
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subpather: kubeDeps.Subpather,
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maxPods: int(kubeCfg.MaxPods),
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podsPerCore: int(kubeCfg.PodsPerCore),
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syncLoopMonitor: atomic.Value{},
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daemonEndpoints: daemonEndpoints,
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containerManager: kubeDeps.ContainerManager,
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nodeIPs: nodeIPs,
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nodeIPValidator: validateNodeIP,
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clock: clock.RealClock{},
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enableControllerAttachDetach: kubeCfg.EnableControllerAttachDetach,
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makeIPTablesUtilChains: kubeCfg.MakeIPTablesUtilChains,
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iptablesMasqueradeBit: int(kubeCfg.IPTablesMasqueradeBit),
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iptablesDropBit: int(kubeCfg.IPTablesDropBit),
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experimentalHostUserNamespaceDefaulting: utilfeature.DefaultFeatureGate.Enabled(features.ExperimentalHostUserNamespaceDefaultingGate),
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keepTerminatedPodVolumes: keepTerminatedPodVolumes,
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nodeStatusMaxImages: nodeStatusMaxImages,
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tracer: tracer,
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hostname: hostname,
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hostnameOverridden: hostnameOverridden,
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nodeName: nodeName,
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kubeClient: kubeDeps.KubeClient,
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heartbeatClient: kubeDeps.HeartbeatClient,
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onRepeatedHeartbeatFailure: kubeDeps.OnHeartbeatFailure,
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rootDirectory: filepath.Clean(rootDirectory),
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resyncInterval: kubeCfg.SyncFrequency.Duration,
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sourcesReady: config.NewSourcesReady(kubeDeps.PodConfig.SeenAllSources),
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registerNode: registerNode,
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registerWithTaints: registerWithTaints,
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registerSchedulable: registerSchedulable,
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dnsConfigurer: dns.NewConfigurer(kubeDeps.Recorder, nodeRef, nodeIPs, clusterDNS, kubeCfg.ClusterDomain, kubeCfg.ResolverConfig),
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serviceLister: serviceLister,
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serviceHasSynced: serviceHasSynced,
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nodeLister: nodeLister,
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nodeHasSynced: nodeHasSynced,
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streamingConnectionIdleTimeout: kubeCfg.StreamingConnectionIdleTimeout.Duration,
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recorder: kubeDeps.Recorder,
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cadvisor: kubeDeps.CAdvisorInterface,
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cloud: kubeDeps.Cloud,
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externalCloudProvider: cloudprovider.IsExternal(cloudProvider),
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providerID: providerID,
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nodeRef: nodeRef,
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nodeLabels: nodeLabels,
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nodeStatusUpdateFrequency: kubeCfg.NodeStatusUpdateFrequency.Duration,
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nodeStatusReportFrequency: kubeCfg.NodeStatusReportFrequency.Duration,
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os: kubeDeps.OSInterface,
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oomWatcher: oomWatcher,
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cgroupsPerQOS: kubeCfg.CgroupsPerQOS,
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cgroupRoot: kubeCfg.CgroupRoot,
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mounter: kubeDeps.Mounter,
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hostutil: kubeDeps.HostUtil,
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subpather: kubeDeps.Subpather,
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maxPods: int(kubeCfg.MaxPods),
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podsPerCore: int(kubeCfg.PodsPerCore),
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syncLoopMonitor: atomic.Value{},
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daemonEndpoints: daemonEndpoints,
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containerManager: kubeDeps.ContainerManager,
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nodeIPs: nodeIPs,
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nodeIPValidator: validateNodeIP,
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clock: clock.RealClock{},
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enableControllerAttachDetach: kubeCfg.EnableControllerAttachDetach,
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makeIPTablesUtilChains: kubeCfg.MakeIPTablesUtilChains,
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iptablesMasqueradeBit: int(kubeCfg.IPTablesMasqueradeBit),
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iptablesDropBit: int(kubeCfg.IPTablesDropBit),
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keepTerminatedPodVolumes: keepTerminatedPodVolumes,
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nodeStatusMaxImages: nodeStatusMaxImages,
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tracer: tracer,
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}
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if klet.cloud != nil {
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@ -596,10 +595,6 @@ func NewMainKubelet(kubeCfg *kubeletconfiginternal.KubeletConfiguration,
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klet.configMapManager = configMapManager
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}
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if klet.experimentalHostUserNamespaceDefaulting {
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klog.InfoS("Experimental host user namespace defaulting is enabled")
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}
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machineInfo, err := klet.cadvisor.MachineInfo()
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if err != nil {
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return nil, err
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@ -1227,13 +1222,6 @@ type Kubelet struct {
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// The AppArmor validator for checking whether AppArmor is supported.
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appArmorValidator apparmor.Validator
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// experimentalHostUserNamespaceDefaulting sets userns=true when users request host namespaces (pid, ipc, net),
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// are using non-namespaced capabilities (mknod, sys_time, sys_module), the pod contains a privileged container,
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// or using host path volumes.
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// This should only be enabled when the container runtime is performing user remapping AND if the
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// experimental behavior is desired.
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experimentalHostUserNamespaceDefaulting bool
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// StatsProvider provides the node and the container stats.
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StatsProvider *stats.Provider
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@ -38,7 +38,6 @@ import (
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"k8s.io/apimachinery/pkg/util/sets"
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utilvalidation "k8s.io/apimachinery/pkg/util/validation"
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utilfeature "k8s.io/apiserver/pkg/util/feature"
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"k8s.io/component-helpers/storage/ephemeral"
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runtimeapi "k8s.io/cri-api/pkg/apis/runtime/v1"
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"k8s.io/klog/v2"
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podutil "k8s.io/kubernetes/pkg/api/v1/pod"
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@ -515,11 +514,6 @@ func (kl *Kubelet) GenerateRunContainerOptions(ctx context.Context, pod *v1.Pod,
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}
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}
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// only do this check if the experimental behavior is enabled, otherwise allow it to default to false
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if kl.experimentalHostUserNamespaceDefaulting {
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opts.EnableHostUserNamespace = kl.enableHostUserNamespace(ctx, pod)
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}
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return opts, cleanupAction, nil
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}
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@ -2169,82 +2163,3 @@ func (kl *Kubelet) cleanupOrphanedPodCgroups(pcm cm.PodContainerManager, cgroupP
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go pcm.Destroy(val)
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}
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}
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// enableHostUserNamespace determines if the host user namespace should be used by the container runtime.
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// Returns true if the pod is using a host pid, pic, or network namespace, the pod is using a non-namespaced
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// capability, the pod contains a privileged container, or the pod has a host path volume.
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//
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// NOTE: when if a container shares any namespace with another container it must also share the user namespace
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// or it will not have the correct capabilities in the namespace. This means that host user namespace
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// is enabled per pod, not per container.
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func (kl *Kubelet) enableHostUserNamespace(ctx context.Context, pod *v1.Pod) bool {
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if kubecontainer.HasPrivilegedContainer(pod) || hasHostNamespace(pod) ||
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hasHostVolume(pod) || hasNonNamespacedCapability(pod) || kl.hasHostMountPVC(ctx, pod) {
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return true
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}
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return false
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}
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// hasNonNamespacedCapability returns true if MKNOD, SYS_TIME, or SYS_MODULE is requested for any container.
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func hasNonNamespacedCapability(pod *v1.Pod) bool {
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for _, c := range pod.Spec.Containers {
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if c.SecurityContext != nil && c.SecurityContext.Capabilities != nil {
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for _, cap := range c.SecurityContext.Capabilities.Add {
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if cap == "MKNOD" || cap == "SYS_TIME" || cap == "SYS_MODULE" {
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return true
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}
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}
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}
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}
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return false
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}
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// hasHostVolume returns true if the pod spec has a HostPath volume.
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func hasHostVolume(pod *v1.Pod) bool {
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for _, v := range pod.Spec.Volumes {
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if v.HostPath != nil {
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return true
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}
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}
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return false
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}
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// hasHostNamespace returns true if hostIPC, hostNetwork, or hostPID are set to true.
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func hasHostNamespace(pod *v1.Pod) bool {
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if pod.Spec.SecurityContext == nil {
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return false
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}
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return pod.Spec.HostIPC || pod.Spec.HostNetwork || pod.Spec.HostPID
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}
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// hasHostMountPVC returns true if a PVC is referencing a HostPath volume.
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func (kl *Kubelet) hasHostMountPVC(ctx context.Context, pod *v1.Pod) bool {
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for _, volume := range pod.Spec.Volumes {
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pvcName := ""
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switch {
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case volume.PersistentVolumeClaim != nil:
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pvcName = volume.PersistentVolumeClaim.ClaimName
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case volume.Ephemeral != nil:
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pvcName = ephemeral.VolumeClaimName(pod, &volume)
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default:
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continue
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}
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pvc, err := kl.kubeClient.CoreV1().PersistentVolumeClaims(pod.Namespace).Get(ctx, pvcName, metav1.GetOptions{})
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if err != nil {
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klog.InfoS("Unable to retrieve pvc", "pvc", klog.KRef(pod.Namespace, pvcName), "err", err)
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continue
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}
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if pvc != nil {
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referencedVolume, err := kl.kubeClient.CoreV1().PersistentVolumes().Get(ctx, pvc.Spec.VolumeName, metav1.GetOptions{})
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if err != nil {
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klog.InfoS("Unable to retrieve pv", "pvName", pvc.Spec.VolumeName, "err", err)
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continue
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}
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if referencedVolume != nil && referencedVolume.Spec.HostPath != nil {
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return true
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}
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}
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}
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return false
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}
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@ -3437,222 +3437,6 @@ func TestGetPortForward(t *testing.T) {
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}
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}
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func TestHasHostMountPVC(t *testing.T) {
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type testcase struct {
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pvError error
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pvcError error
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expected bool
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podHasPVC bool
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pvcIsHostPath bool
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podHasEphemeral bool
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}
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tests := map[string]testcase{
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"no pvc": {podHasPVC: false, expected: false},
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"error fetching pvc": {
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podHasPVC: true,
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pvcError: fmt.Errorf("foo"),
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expected: false,
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},
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"error fetching pv": {
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podHasPVC: true,
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pvError: fmt.Errorf("foo"),
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expected: false,
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},
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"host path pvc": {
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podHasPVC: true,
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pvcIsHostPath: true,
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expected: true,
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},
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"enabled ephemeral host path": {
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podHasEphemeral: true,
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pvcIsHostPath: true,
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expected: true,
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},
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"non host path pvc": {
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podHasPVC: true,
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pvcIsHostPath: false,
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expected: false,
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},
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}
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run := func(t *testing.T, v testcase) {
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ctx := context.Background()
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testKubelet := newTestKubelet(t, false)
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defer testKubelet.Cleanup()
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pod := &v1.Pod{
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Spec: v1.PodSpec{},
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}
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volumeToReturn := &v1.PersistentVolume{
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Spec: v1.PersistentVolumeSpec{},
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}
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if v.podHasPVC {
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pod.Spec.Volumes = []v1.Volume{
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{
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VolumeSource: v1.VolumeSource{
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PersistentVolumeClaim: &v1.PersistentVolumeClaimVolumeSource{},
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},
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},
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}
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}
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if v.podHasEphemeral {
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pod.Spec.Volumes = []v1.Volume{
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{
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Name: "xyz",
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VolumeSource: v1.VolumeSource{
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Ephemeral: &v1.EphemeralVolumeSource{},
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},
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},
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}
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}
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if (v.podHasPVC || v.podHasEphemeral) && v.pvcIsHostPath {
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volumeToReturn.Spec.PersistentVolumeSource = v1.PersistentVolumeSource{
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HostPath: &v1.HostPathVolumeSource{},
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}
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}
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testKubelet.fakeKubeClient.AddReactor("get", "persistentvolumeclaims", func(action core.Action) (bool, runtime.Object, error) {
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return true, &v1.PersistentVolumeClaim{
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Spec: v1.PersistentVolumeClaimSpec{
|
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VolumeName: "foo",
|
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},
|
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}, v.pvcError
|
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})
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testKubelet.fakeKubeClient.AddReactor("get", "persistentvolumes", func(action core.Action) (bool, runtime.Object, error) {
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return true, volumeToReturn, v.pvError
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})
|
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|
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actual := testKubelet.kubelet.hasHostMountPVC(ctx, pod)
|
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if actual != v.expected {
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t.Errorf("expected %t but got %t", v.expected, actual)
|
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}
|
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}
|
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|
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for k, v := range tests {
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t.Run(k, func(t *testing.T) {
|
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run(t, v)
|
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})
|
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}
|
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}
|
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|
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func TestHasNonNamespacedCapability(t *testing.T) {
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createPodWithCap := func(caps []v1.Capability) *v1.Pod {
|
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pod := &v1.Pod{
|
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Spec: v1.PodSpec{
|
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Containers: []v1.Container{{}},
|
||||
},
|
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}
|
||||
|
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if len(caps) > 0 {
|
||||
pod.Spec.Containers[0].SecurityContext = &v1.SecurityContext{
|
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Capabilities: &v1.Capabilities{
|
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Add: caps,
|
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},
|
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}
|
||||
}
|
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return pod
|
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}
|
||||
|
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nilCaps := createPodWithCap([]v1.Capability{v1.Capability("foo")})
|
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nilCaps.Spec.Containers[0].SecurityContext = nil
|
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|
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tests := map[string]struct {
|
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pod *v1.Pod
|
||||
expected bool
|
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}{
|
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"nil security contxt": {createPodWithCap(nil), false},
|
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"nil caps": {nilCaps, false},
|
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"namespaced cap": {createPodWithCap([]v1.Capability{v1.Capability("foo")}), false},
|
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"non-namespaced cap MKNOD": {createPodWithCap([]v1.Capability{v1.Capability("MKNOD")}), true},
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"non-namespaced cap SYS_TIME": {createPodWithCap([]v1.Capability{v1.Capability("SYS_TIME")}), true},
|
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"non-namespaced cap SYS_MODULE": {createPodWithCap([]v1.Capability{v1.Capability("SYS_MODULE")}), true},
|
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}
|
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|
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for k, v := range tests {
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actual := hasNonNamespacedCapability(v.pod)
|
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if actual != v.expected {
|
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t.Errorf("%s failed, expected %t but got %t", k, v.expected, actual)
|
||||
}
|
||||
}
|
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}
|
||||
|
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func TestHasHostVolume(t *testing.T) {
|
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pod := &v1.Pod{
|
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Spec: v1.PodSpec{
|
||||
Volumes: []v1.Volume{
|
||||
{
|
||||
VolumeSource: v1.VolumeSource{
|
||||
HostPath: &v1.HostPathVolumeSource{},
|
||||
},
|
||||
},
|
||||
},
|
||||
},
|
||||
}
|
||||
|
||||
result := hasHostVolume(pod)
|
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if !result {
|
||||
t.Errorf("expected host volume to enable host user namespace")
|
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}
|
||||
|
||||
pod.Spec.Volumes[0].VolumeSource.HostPath = nil
|
||||
result = hasHostVolume(pod)
|
||||
if result {
|
||||
t.Errorf("expected nil host volume to not enable host user namespace")
|
||||
}
|
||||
}
|
||||
|
||||
func TestHasHostNamespace(t *testing.T) {
|
||||
tests := map[string]struct {
|
||||
ps v1.PodSpec
|
||||
expected bool
|
||||
}{
|
||||
"nil psc": {
|
||||
ps: v1.PodSpec{},
|
||||
expected: false},
|
||||
|
||||
"host pid true": {
|
||||
ps: v1.PodSpec{
|
||||
HostPID: true,
|
||||
SecurityContext: &v1.PodSecurityContext{},
|
||||
},
|
||||
expected: true,
|
||||
},
|
||||
"host ipc true": {
|
||||
ps: v1.PodSpec{
|
||||
HostIPC: true,
|
||||
SecurityContext: &v1.PodSecurityContext{},
|
||||
},
|
||||
expected: true,
|
||||
},
|
||||
"host net true": {
|
||||
ps: v1.PodSpec{
|
||||
HostNetwork: true,
|
||||
SecurityContext: &v1.PodSecurityContext{},
|
||||
},
|
||||
expected: true,
|
||||
},
|
||||
"no host ns": {
|
||||
ps: v1.PodSpec{
|
||||
SecurityContext: &v1.PodSecurityContext{},
|
||||
},
|
||||
expected: false,
|
||||
},
|
||||
}
|
||||
|
||||
for k, v := range tests {
|
||||
pod := &v1.Pod{
|
||||
Spec: v.ps,
|
||||
}
|
||||
actual := hasHostNamespace(pod)
|
||||
if actual != v.expected {
|
||||
t.Errorf("%s failed, expected %t but got %t", k, v.expected, actual)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func TestTruncatePodHostname(t *testing.T) {
|
||||
for c, test := range map[string]struct {
|
||||
input string
|
||||
|
||||
Loading…
Reference in New Issue
Block a user