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Description of problem:
After fix https://bugzilla.redhat.com/show_bug.cgi?id=1918282, seems the permission inside container is not enough for create a new user correctly. The steps for setting up home directory always report Operation not permitted.

Version-Release number of selected component (if applicable):
podman-1.6.4-28.el7_9.x86_64 

How reproducible:
always

Steps to Reproduce:
1. Start a container
# podman run --name testctr -d docker.io/library/alpine:latest top
2. Use adduser to create a new user
# podman exec testctr adduser -S testuser
adduser: /home/testuser: Operation not permitted
adduser: /home/testuser: Operation not permitted
adduser: /home/testuser: Operation not permitted

3. Check the home directory
# podman exec -it testctr sh
/ # ls /home/ -l
total 0
drwxr-xr-x    2 root     root             6 Feb 19 06:38 testuser


Actual results:
adduser command failed to setup the home directory for new user


Expected results:
User can be created and used normally

Additional info:

Test with podman-1.6.4-29.el7_9.x86_64 and it works as expected now. So set this to verified.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Important: podman security update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2021:0681