podman 5.3.1 errors if userns set to keep-id (on WSL)

[rob-broadley]

Issue Description

I'm trying to use distrobox on an openSUSE tumbleweed WSL install but am hitting errors with podman 5.3.1.
podman was install using zypper (zypper in podman).

The issue I am hitting is when running a container with --userns keep-id (which distrobox does) I get the error:
Error: crun: writing file `/proc/49175/gid_map`: Operation not permitted: OCI permission denied.

I have tried on an older version of tumbleweed on WSL (same machine - so e.g. kernel version is the same) with podman version 5.1.2 and the issue is not present.

Steps to reproduce the issue

Steps to reproduce the issue

1. In WSL run as a non root user: podman run -it --rm --userns keep-id alpine

Describe the results you received

Error: crun: writing file `/proc/49175/gid_map`: Operation not permitted: OCI permission denied.

Describe the results you expected

The container starts and a shell prompt is presented.

podman info output

host:
  arch: amd64
  buildahVersion: 1.38.0
  cgroupControllers: []
  cgroupManager: cgroupfs
  cgroupVersion: v1
  conmon:
    package: conmon-2.1.12-1.1.x86_64
    path: /usr/bin/conmon
    version: 'conmon version 2.1.12, commit: unknown'
  cpuUtilization:
    idlePercent: 99.1
    systemPercent: 0.41
    userPercent: 0.49
  cpus: 12
  databaseBackend: sqlite
  distribution:
    distribution: opensuse-tumbleweed
    version: "20241226"
  eventLogger: journald
  freeLocks: 2042
  hostname: my-host
  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: 5.15.167.4-microsoft-standard-WSL2
  linkmode: dynamic
  logDriver: journald
  memFree: 15295799296
  memTotal: 16658907136
  networkBackend: netavark
  networkBackendInfo:
    backend: netavark
    dns:
      package: aardvark-dns-1.13.1-1.1.x86_64
      path: /usr/libexec/podman/aardvark-dns
      version: aardvark-dns 1.13.1
    package: netavark-1.13.1-1.1.x86_64
    path: /usr/libexec/podman/netavark
    version: netavark 1.13.1
  ociRuntime:
    name: crun
    package: crun-1.19-1.1.x86_64
    path: /usr/bin/crun
    version: |-
      crun version 1.19
      commit: db31c42ac46e20b5527f5339dcbf6f023fcd539c
      rundir: /run/user/1000/crun
      spec: 1.0.0
      +SYSTEMD +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +CRIU +LIBKRUN +WASM:wasmedge +YAJL
  os: linux
  pasta:
    executable: /usr/bin/pasta
    package: passt-20241211.09478d5-1.1.x86_64
    version: |
      pasta 20241211.09478d5-1.1
      Copyright Red Hat
      GNU General Public License, version 2 or later
        <https://www.gnu.org/licenses/old-licenses/gpl-2.0.html>
      This is free software: you are free to change and redistribute it.
      There is NO WARRANTY, to the extent permitted by law.
  remoteSocket:
    exists: true
    path: /run/user/1000/podman/podman.sock
  rootlessNetworkCmd: pasta
  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: ""
    package: ""
    version: ""
  swapFree: 4294967296
  swapTotal: 4294967296
  uptime: 4h 6m 31.00s (Approximately 0.17 days)
  variant: ""
plugins:
  authorization: null
  log:
  - k8s-file
  - none
  - passthrough
  - journald
  network:
  - bridge
  - macvlan
  - ipvlan
  volume:
  - local
registries:
  search:
  - registry.opensuse.org
  - registry.suse.com
  - docker.io
store:
  configFile: /home/rob/.config/containers/storage.conf
  containerStore:
    number: 2
    paused: 0
    running: 0
    stopped: 2
  graphDriverName: overlay
  graphOptions: {}
  graphRoot: /home/rob/.local/share/containers/storage
  graphRootAllocated: 1081101176832
  graphRootUsed: 6643830784
  graphStatus:
    Backing Filesystem: extfs
    Native Overlay Diff: "true"
    Supports d_type: "true"
    Supports shifting: "false"
    Supports volatile: "true"
    Using metacopy: "false"
  imageCopyTmpDir: /var/tmp
  imageStore:
    number: 3
  runRoot: /run/user/1000/containers
  transientStore: false
  volumePath: /home/rob/.local/share/containers/storage/volumes
version:
  APIVersion: 5.3.1
  Built: 1733485830
  BuiltTime: Fri Dec  6 11:50:30 2024
  GitCommit: ""
  GoVersion: go1.23.4
  Os: linux
  OsArch: linux/amd64
  Version: 5.3.1

Podman in a container

No

Privileged Or Rootless

Rootless

Upstream Latest Release

Yes

Additional environment details

WSL 2.

Additional information

No response