Simple script to fix /mach_kernel file visibility. Can be uploaded as a software payload in Absolute Manage.

fix_mach_kernel_visibility.sh

#!/bin/bash

# https://gist.github.com/ac945399eb1f151bc6fc

# Simple script to set the hidden file flag on /mach_kernel.

# Adapted from Rich Trouton's adaption of Tim Sutton's script.
# Link: https://derflounder.wordpress.com/2015/03/11/fixing-mach_kernel-file-visibility-using-casper/
# Link: http://macops.ca/security-updates-leaving-mach_kernel-visible/

if [[ -e /mach_kernel ]]; then
  # Simple test for a static substring in Bash
  if [[ "$(/bin/ls -lO /mach_kernel)" != *hidden* ]]; then
    echo "/mach_kernel is visible. Setting hidden flag."
    /usr/bin/chflags hidden /mach_kernel
  fi
fi

exit 0