Could I get some clarification of scope for security.stackexchange.
I'd though my question was on topic as a "hardening" question, as mentioned in the help.
I don't quite understand what boundary is or why this was off topic. Was this a case that I didn't make the "hardening" component clear enough/early enough in the question? Or is it otherwise off topic to ask how to harden specific software against specific exploits here?
As a note, grub questions are better migrated to unix and Linux than super user IMHO.