Ensure systemd ability to spawn an interactive boot process is disabled

How it is checked

Audit method: Shell command

alt0() { command -v grep >/dev/null 2>&1 || { echo "step1: grep not installed"; return 1; }; command -v grubby >/dev/null 2>&1 || { echo "step1: grubby not installed"; return 1; }; o=$(bash -c 'grubby --info=ALL | grep -E '"'"'^\s*args='"'"' | grep '"'"'systemd.confirm_spawn'"'"'' 2>/dev/null); [ -z "$o" ] || { echo "step1: $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 systemd.confirm_spawn argument from all boot entries: # grubby --update-kernel ALL --remove-args=systemd.confirm_spawn Then edit /etc/default/grub and remove systemd.confirm_spawn from the GRUB_CMDLINE_LINUX (and GRUB_CMDLINE_LINUX_DEFAULT) line so it is not reintroduced on the next kernel or bootloader update. If the system uses /etc/kernel/cmdline, remove it there as well.

Check this host

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

tmaegis scan --target linux