In Fedora 34 release, the SELinux policy has been updated to match the state in the current kernel so that SELinux can utilize the kernel provided features.
The enhancements to the SELinux policy include new:
This update brings better granularity for granting permissions, which has subsequent security benefits.
With this release, support for disabling SELinux through the
SELINUX=disabled option in the
/etc/selinux/config file has been removed
from the kernel. Furthermore, the Anaconda installation program and the
corresponding man pages have been updated to reflect this change. This
change also enables read-only-after-initialization protection for the Linux
Security Module (LSM) hooks.
If your scenario requires to disable SELinux, add the
to your kernel command line.
See the Changing SELinux states and modes section in Fedora Quick Docs and the https://fedoraproject.org/wiki/Changes/Remove_Support_For_SELinux_Runtime_Disable for more information.