Rootful podman with --userns=auto fails

[ingobecker]

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

/kind bug

Description

Running a certain image as a host user root with --userns=auto causes the same errors as described in containers/podman#14504 but without this option runs just fine. Other images, when run with the same option, seem to work without issues.

Steps to reproduce the issue:

# podman run --userns auto homeassistant/home-assistant:stable

Describe the results you received:

Error: crun: mkdir `secrets`: Permission denied: OCI permission denied

or

Error: crun: open `/var/lib/containers/storage/overlay/cc65e6466f2c4ef019864554561b2887ff7828ff0fa45d60606458277f4a634e/merged/.containerenv`: No such file or directory: OCI runtime attempted to invoke a command that was not found

or

Error: crun: open `/var/lib/containers/storage/overlay/d7382fd09c8bb2af8d0ba4a501c6abbd8c316fab78f69a42a9a512c14cb40eac/merged/resolv.conf`: No such file or directory: OCI runtime attempted to invoke a command that was not found

Describe the results you expected:
The image should run without any errors, just like running it without --userns=auto.

Additional information you deem important (e.g. issue happens only occasionally):
The exact digest of the images is 97469ad6347a2173d524c8c581c4ec97ba2f0349a96bd878b67767cd4fba4820.
The errors occur in no particular order.

Output of podman version:

Client:       Podman Engine
Version:      4.2.1
API Version:  4.2.1
Go Version:   go1.18.5
Built:        Wed Sep  7 19:58:19 2022
OS/Arch:      linux/amd64

Output of podman info:

host:
  arch: amd64
  buildahVersion: 1.27.0
  cgroupControllers:
  - cpuset
  - cpu
  - io
  - memory
  - hugetlb
  - pids
  - misc
  cgroupManager: systemd
  cgroupVersion: v2
  conmon:
    package: conmon-2.1.4-2.fc36.x86_64
    path: /usr/bin/conmon
    version: 'conmon version 2.1.4, commit: '
  cpuUtilization:
    idlePercent: 99.29
    systemPercent: 0.22
    userPercent: 0.5
  cpus: 1
  distribution:
    distribution: fedora
    variant: coreos
    version: "36"
  eventLogger: journald
  hostname: home-assistant
  idMappings:
    gidmap: null
    uidmap: null
  kernel: 5.19.12-200.fc36.x86_64
  linkmode: dynamic
  logDriver: journald
  memFree: 238313472
  memTotal: 2066886656
  networkBackend: cni
  ociRuntime:
    name: crun
    package: crun-1.6-2.fc36.x86_64
    path: /usr/bin/crun
    version: |-
      crun version 1.6
      commit: 18cf2efbb8feb2b2f20e316520e0fd0b6c41ef4d
      spec: 1.0.0
      +SYSTEMD +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +CRIU +YAJL
  os: linux
  remoteSocket:
    path: /run/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: false
    seccompEnabled: true
    seccompProfilePath: /usr/share/containers/seccomp.json
    selinuxEnabled: true
  serviceIsRemote: false
  slirp4netns:
    executable: /usr/bin/slirp4netns
    package: slirp4netns-1.2.0-0.2.beta.0.fc36.x86_64
    version: |-
      slirp4netns version 1.2.0-beta.0
      commit: 477db14a24ff1a3de3a705e51ca2c4c1fe3dda64
      libslirp: 4.6.1
      SLIRP_CONFIG_VERSION_MAX: 3
      libseccomp: 2.5.3
  swapFree: 0
  swapTotal: 0
  uptime: 19h 45m 17.00s (Approximately 0.79 days)
plugins:
  authorization: null
  log:
  - k8s-file
  - none
  - passthrough
  - journald
  network:
  - bridge
  - macvlan
  - ipvlan
  volume:
  - local
registries:
  search:
  - registry.fedoraproject.org
  - registry.access.redhat.com
  - docker.io
  - quay.io
store:
  configFile: /usr/share/containers/storage.conf
  containerStore:
    number: 13
    paused: 0
    running: 0
    stopped: 13
  graphDriverName: overlay
  graphOptions:
    overlay.mountopt: nodev,metacopy=on
  graphRoot: /var/lib/containers/storage
  graphRootAllocated: 16631443456
  graphRootUsed: 3813478400
  graphStatus:
    Backing Filesystem: xfs
    Native Overlay Diff: "false"
    Supports d_type: "true"
    Using metacopy: "true"
  imageCopyTmpDir: /var/tmp
  imageStore:
    number: 4
  runRoot: /run/containers/storage
  volumePath: /var/lib/containers/storage/volumes
version:
  APIVersion: 4.2.1
  Built: 1662580699
  BuiltTime: Wed Sep  7 19:58:19 2022
  GitCommit: ""
  GoVersion: go1.18.5
  Os: linux
  OsArch: linux/amd64
  Version: 4.2.1

[giuseppe]

have you added additional IDs to /etc/subuid and /etc/subgid for the containers user?

[ingobecker]

I'm running Fedora CoreOS as the host system which comes with the entry containers:165536:65536 in /etc/sub*id by default. One thing i recognized though is that the system doesn't come with a user containers by default. I created one by myself because i'm not sure if the entries in /etc/sub*id make sense without a corresponding user.

[giuseppe]

PR here: #1411