mountPropagation: Bidirectional does not work in Kubernetes Pod Yaml

[rudolfvesely]

Is this a BUG REPORT or FEATURE REQUEST? (leave only one on its own line)

/kind bug

Description

mountPropagation: Bidirectional does not work in Kubernetes Pod Yaml. rshared when executing podman directly works fine.

Steps to reproduce the issue:

• as non-root user:

mkdir /tmp/from
podman unshare umount /tmp/from # if bind mounted previously
podman unshare mount --make-shared --bind /tmp/from /tmp/from
podman run --cap-add SYS_ADMIN --rm --volume=/tmp/from:/to:rshared -d --name=mounting debian sh -c 'mkdir /to; mount -t tmpfs tmpfs /to; date > /to/myfile; sleep infinity'
podman unshare ls -l /tmp/from

• this is good:

total 4
-rw-r--r-- 1 root root 29 Feb 23 11:55 myfile

• as non-root user:

---
apiVersion: v1
kind: Pod
metadata:
  name: mypod
spec:
  containers:
    - name: app
      image: docker.io/library/debian
      command: ['sh']
      args:
        - -c
        - 'mount -t tmpfs tmpfs /mnt; date > /mnt/myfile; sleep infinity'
      volumeMounts:
        - name: mydata
          mountPath: /mnt
          mountPropagation: Bidirectional
      securityContext:
        capabilities:
          add:
          - CAP_SYS_ADMIN
  volumes:
    - name: mydata
      hostPath:
        type: Directory
        path: /tmp/from

mkdir /tmp/from
podman unshare umount /tmp/from # if bind mounted previously
podman unshare mount --make-shared --bind /tmp/from /tmp/from
podman play kube file.yml

• this is good:

podman exec mypod-app ls -l /mnt

total 4
-rw-r--r-- 1 root root 29 Feb 23 12:05 myfile

• this is good:

podman exec mypod-app sh -c 'mount | grep "tmpfs.*mnt"'

tmpfs on /mnt type tmpfs (rw,relatime,uid=1234,gid=1234,inode64)

• this is wrong:

podman unshare ls -l /tmp/from

total 0

Describe the results you received:

The file "myfile" should be listed.

Additional information you deem important (e.g. issue happens only occasionally):

Always

Output of podman version:

Version:      3.4.4
API Version:  3.4.4
Go Version:   go1.17.5
Built:        Thu Jan  1 00:00:00 1970
OS/Arch:      linux/amd64

Output of podman info --debug:

host:
  arch: amd64
  buildahVersion: 1.23.1
  cgroupControllers:
  - memory
  - pids
  cgroupManager: systemd
  cgroupVersion: v2
  conmon:
    package: 'conmon: /usr/bin/conmon'
    path: /usr/bin/conmon
    version: 'conmon version 2.0.25, commit: unknown'
  cpus: 16
  distribution:
    distribution: debian
    version: unknown
  eventLogger: journald
  hostname: ip-172-16-1-62
  idMappings:
    gidmap:
    - container_id: 0
      host_id: 1000
      size: 1
    - container_id: 1
      host_id: 100000
      size: 65536
    uidmap:
    - container_id: 0
      host_id: 1000
      size: 1
    - container_id: 1
      host_id: 100000
      size: 65536
  kernel: 5.15.0-3-cloud-amd64
  linkmode: dynamic
  logDriver: journald
  memFree: 42368770048
  memTotal: 43133235200
  ociRuntime:
    name: crun
    package: 'crun: /usr/bin/crun'
    path: /usr/bin/crun
    version: |-
      crun version 0.17
      commit: 0e9229ae34caaebcb86f1fde18de3acaf18c6d9a
      spec: 1.0.0
      +SYSTEMD +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +YAJL
  os: linux
  remoteSocket:
    path: /run/user/1000/podman/podman.sock
  security:
    apparmorEnabled: false
    capabilities: CAP_CHOWN,CAP_DAC_OVERRIDE,CAP_FOWNER,CAP_FSETID,CAP_KILL,CAP_NET_BIND_SERVICE,CAP_SETFCAP,CAP_SETGID,CAP_SETPCAP,CAP_SETUID,CAP_SYS_CHROOT
    rootless: true
    seccompEnabled: true
    seccompProfilePath: /usr/share/containers/seccomp.json
    selinuxEnabled: false
  serviceIsRemote: false
  slirp4netns:
    executable: /usr/bin/slirp4netns
    package: 'slirp4netns: /usr/bin/slirp4netns'
    version: |-
      slirp4netns version 1.0.1
      commit: 6a7b16babc95b6a3056b33fb45b74a6f62262dd4
      libslirp: 4.6.1
  swapFree: 0
  swapTotal: 0
  uptime: 3m 20.16s
plugins:
  log:
  - k8s-file
  - none
  - journald
  network:
  - bridge
  - macvlan
  volume:
  - local
registries: {}
store:
  configFile: /home/admin/.config/containers/storage.conf
  containerStore:
    number: 0
    paused: 0
    running: 0
    stopped: 0
  graphDriverName: overlay
  graphOptions: {}
  graphRoot: /home/admin/.local/share/containers/storage
  graphStatus:
    Backing Filesystem: extfs
    Native Overlay Diff: "true"
    Supports d_type: "true"
    Using metacopy: "false"
  imageStore:
    number: 0
  runRoot: /run/user/1000/containers
  volumePath: /home/admin/.local/share/containers/storage/volumes
version:
  APIVersion: 3.4.4
  Built: 0
  BuiltTime: Thu Jan  1 00:00:00 1970
  GitCommit: ""
  GoVersion: go1.17.5
  OsArch: linux/amd64
  Version: 3.4.4

Package info (e.g. output of rpm -q podman or apt list podman):

podman/testing,now 3.4.4+ds1-1 amd64 [installed]

Have you tested with the latest version of Podman and have you checked the Podman Troubleshooting Guide? (https://github.com/containers/podman/blob/main/troubleshooting.md)

Yes

Additional environment details (AWS, VirtualBox, physical, etc.):

AWS

[giuseppe]

PR here: #13320