I recently used a package that overwrote C-x C-s to something other than save, causing me to lose a lot of work. Is there a way I can advise emacs to check for a blacklist of keybindings that it shouldn't allow to be remapped?

Edit: The package in question is (the otherwise excellent) atomic-chrome, and this looks to be the offending line:

(defvar atomic-chrome-edit-mode-map
  (let ((map (make-sparse-keymap)))
    (define-key map (kbd "C-x C-s") 'atomic-chrome-send-buffer-text)
    (define-key map (kbd "C-c C-c") 'atomic-chrome-close-current-buffer)
  "Keymap for minor mode `atomic-chrome-edit-mode'.")
  • Can you give more details? What package was it? How did you install it? Melpa? What you are describing is strange. Usually global keybindings don't get remapped by installing a new package.
    – Ajned
    Commented Sep 14, 2020 at 21:17
  • Clearly that's a bug in the package you were using. Have you reported it? What was it?
    – phils
    Commented Sep 14, 2020 at 22:58
  • They probably meant C-c C-s - please report it to them.
    – NickD
    Commented Oct 1, 2020 at 2:27

1 Answer 1


One solution could be to advise the define-key function and check which key is being bound against a block list:

(defvar define-key-block-list
  '("C-x C-s"))

(defun define-key-filter (define-key &rest args)
  (if (cl-member (nth 1 args) define-key-block-list :key 'kbd :test 'equal)
      (message "Blocked %s from being bound" (key-description (nth 1 args)))
    (apply define-key args)))

(advice-add 'define-key :around #'define-key-filter)

(global-set-key (kbd "C-x C-s") (lambda () (interactive) (message "test")))
;; Blocked C-x C-s from being bound

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