SLE Micro - SELinux Relabeling Service runs at every reboot

This document (000020773) is provided subject to the disclaimer at the end of this document.

Environment

SLE Micro 5.2

Situation

SELinux is enabled but the SELinux relabeling service runs at every reboot.
slem:~ # cat /sys/kernel/security/lsm
lockdown,capability,selinux
slem:~ # systemd-analyze blame
31.541s \x2esnapshots-relabel.service
18.241s wicked.service
..
initrd detects a labeled system but disabled SELinux:
Sep 19 13:35:09 slem systemd[1]: Starting dracut pre-pivot and cleanup hook...
Sep 19 13:35:09 slem dracut-pre-pivot[435]: Warning: SElinux is off in lablelled system!
SELinux itself thinks it is enabled, so the selinux-relabel-generator runs
Sep 19 13:35:12 slem root[472]: SELinux relabel generator: selinux is enabled
Sep 19 13:35:12 slem root[473]: SELinux relabel generator: /etc/selinux/.autorelabel exist
Sep 19 13:35:13 slem systemd[1]: Successfully loaded SELinux policy in 2.093083s.
Sep 19 13:35:13 slem systemd[1]: Relabelled /dev, /dev/shm, /run, /sys/fs/cgroup in 106.786ms.

Resolution

1) Edit /etc/default/grub and add selinux=1 to GRUB_CMDLINE_LINUX_DEFAULT,
GRUB_CMDLINE_LINUX_DEFAULT="splash=silent swapaccount=1 apparmor=0 mitigations=auto quiet crashkernel=195M,high crashkernel=72M,low security=selinux selinux=1"

2) run:
transactional-update grub.cfg
3) reboot

Cause

For some reasons selinux=1 kernel parameter is missing in the GRUB 2 boot loader:
Sep 19 13:35:06 slem kernel: Command line: BOOT_IMAGE=/boot/vmlinuz-5.3.18-150300.59.93-default root=UUID=d14ddd02-01f3-4910-b9ff-bf38d1684a64 rd.timeout=60 splash=silent swapaccount=1 apparmor=0 mitigations=auto quiet crashkernel=195M,high crashkernel=72M,low security=selinux

Additional Information

Introduction to SELinux - https://documentation.suse.com/sle-micro/5.2/single-html/SLE-Micro-security/#sec-introduction-selinux

Disclaimer

This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.

  • Document ID:000020773
  • Creation Date: 20-Sep-2022
  • Modified Date:20-Sep-2022
    • SUSE Linux Enterprise Micro

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