Ensure SELinux is not disabled in bootloader configuration

How it is checked

Audit method: Shell command

alt0() { o=$(bash -c 'grubby --info=ALL | grep -Po '"'"'(selinux|enforcing)=0\b'"'"'' 2>/dev/null); [ -z "$o" ] || { echo "step1: $o" | head -c 300; return 1; }; o=$(bash -c 'grep -Prs -- '"'"'^\h*([^#\n\r]+\h+)?kernelopts=([^#\n\r]+\h+)?(selinux|enforcing)=0\b'"'"' /boot/grub2 /boot/efi' 2>/dev/null); [ -z "$o" ] || { echo "step2: $o" | head -c 300; return 1; }; }; if alt0; then echo compliant; fi

Expected output

compliant

How it is fixed

Fix method: Guidance or infrastructure patch

Run the following command to remove the selinux=0 and enforcing=0 parameters: # grubby --update-kernel ALL --remove-args "selinux=0 enforcing=0" Run the following command to remove the selinux=0 and enforcing=0 parameters if they were created by the deprecated grub2-mkconfig command: # grep -Prsq -- '^\h*([^#\n\r]+\h+)?kernelopts=([^#\n\r]+\h+)?(selinux|enforcing)=0\b' /boot/grub2 /boot/efi && grub2-mkconfig -o "$(grep -Prl -- '\h*([^#\n\r]+\h+)?kernelopts=([^#\n\r]+\h+)?(selinux|enforcing)=0\b' /boot/grub2 /boot/efi)"

Check this host

Run this on a machine you are allowed to audit. The scan is read-only.

tmaegis scan --target linux