/dev/null ownership changed on podman exec without -i in rootless container

[pboguslawski]

Issue Description

When podman exec is fired wihout -i in container running rootless (i.e. --user 2000:2000), /dev/null ownership is changed to 2000:2000 on host. No such problem when podman exec is run with -i.

Noticed in Debian 12:

# dpkg -s podman | grep Version
Version: 4.3.1+ds1-8+deb12u1

Steps to reproduce the issue

Steps to reproduce the issue

1. Set /dev/null ownership to root:root on host if different.
2. Start container rootless (i.e. --user 2000:2000).
3. Execute any cmd inside this container with podman exec without -i parameter, i.e. podman exec containername true
4. See /dev/null ownership on host (i.e. stat /dev/null) changed to 2000:2000.

Describe the results you received

Hosts /dev/null user and group changed to container uid/gid (2000:2000).

Describe the results you expected

Hosts /dev/null permissions not changed.

podman info output

Debian 12

# dpkg -s podman | grep Version
Version: 4.3.1+ds1-8+deb12u1

Podman in a container

No

Privileged Or Rootless

Rootless

Upstream Latest Release

No

Additional environment details

Additional environment details

Additional information

Additional information like issue happens only occasionally or issue happens with a particular architecture or on a particular setting

[rhatdan]

A rootless user does not have the rights to chown the UID:GID of /dev/null on the host. So I am guessing that something else strange is happening.

$ chown 2000:2000 /dev/null
chown: changing ownership of '/dev/null': Operation not permitted

[rhatdan]

Also Upstream only supports the latest Podman.