Emacsjail was an Emacs Lisp jail challenge I wrote for UIUCTF 2025. There were 17 solves during the competition, some of which were quite creative! Description Mom, can we have SBCL? No, we have SBCL at home. SBCL at home: Emacs Lisp ;;; -*- lexical-binding:t -*- ( defun check ( input ) ( not ( string-match-p '.*(.*).*' input ))) ( defun panic ( str &rest fmt ) ( message str fmt ) ( kill-emacs ))…