Lightdm Ignores Limit Values

Is this a new report?

Yes

System Info

Void 5.19.17_1 x86_64 GenuineIntel uptodate FFFFF

Package(s) Affected

pam-1.5.2_2 lightdm-1.32.0_2

Does a report exist for this bug with the project's home (upstream) and/or another distro?

No response

Expected behaviour

After setting up Lightdm and modifying /etc/security/limits.conf and restarting the system, the output of ulimit -Hn should be the same as that defined in the configuration file.

For example, mine has the following line for playing games with ESync:

elliot hard nofile 524288

So the output of ulimit -Hn would be: 524288

Actual behaviour

No matter what is written in /etc/security/limits.conf, the output of ulimit -Hn is just the default of 4096. According to this issue in 2020, this can be fixed by adding session required pam_limits.so to /etc/pam.d/lightdm. This should be enabled by default, but the issue was automatically closed due to inactivity.

Steps to reproduce

1. Install and configure Lightdm
2. Set limits in /etc/security/limits.conf
3. Restart system
4. Log in via Lightdm
5. Run ulimit -Hn

Start by reviewing the LightDM PAM configuration at /etc/pam.d/lightdm and the limits in /etc/security/limits.conf, then compare the proposed fix in issue 20105. Reproduce the login flow and check whether ulimit -Hn matches the configured value after logging in through LightDM.