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Fix some file-mode races

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* lisp/emacs-lisp/autoload.el (autoload-ensure-file-writeable):
* lisp/files.el (after-find-file):
* lisp/gnus/gnus-start.el (gnus-dribble-read-file):
* lisp/htmlfontify.el (hfy-copy-and-fontify-file):
* lisp/server.el (server-ensure-safe-dir):
Avoid a race when getting file permissions.
This commit is contained in:
Paul Eggert 2019-09-16 17:43:56 -07:00
parent b124cb8f30
commit bc1c2cf009
5 changed files with 14 additions and 16 deletions
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3
lisp/emacs-lisp/autoload.el
View file

@ -398,9 +398,8 @@ FILE's name."
;; Probably pointless, but replaces the old AUTOGEN_VCS in lisp/Makefile,
;; which was designed to handle CVSREAD=1 and equivalent.
(and autoload-ensure-writable
(file-exists-p file)
(let ((modes (file-modes file)))
(if (zerop (logand modes #o0200))
(if (and modes (zerop (logand modes #o0200)))
;; Ignore any errors here, and let subsequent attempts
;; to write the file raise any real error.
(ignore-errors (set-file-modes file (logior modes #o0200))))))

10
lisp/files.el
View file

@ -2554,13 +2554,13 @@ unless NOMODES is non-nil."
(auto-save-mode 1)))
;; Make people do a little extra work (C-x C-q)
;; before altering a backup file.
(when (backup-file-name-p buffer-file-name)
(setq buffer-read-only t))
;; When a file is marked read-only,
;; make the buffer read-only even if root is looking at it.
(when (and (file-modes (buffer-file-name))
(zerop (logand (file-modes (buffer-file-name)) #o222)))
(setq buffer-read-only t))
(unless buffer-read-only
(when (or (backup-file-name-p buffer-file-name)
(let ((modes (file-modes (buffer-file-name))))
(and modes (zerop (logand modes #o222)))))
(setq buffer-read-only t)))
(unless nomodes
(when (and view-read-only view-mode)
(view-mode -1))

5
lisp/gnus/gnus-start.el
View file

@ -897,9 +897,8 @@ If REGEXP is given, lines that match it will be deleted."
(set-buffer-modified-p t))
;; Set the file modes to reflect the .newsrc file modes.
(save-buffer)
(when (and (file-exists-p gnus-current-startup-file)
(file-exists-p dribble-file)
(setq modes (file-modes gnus-current-startup-file)))
(when (and (setq modes (file-modes gnus-current-startup-file))
(file-exists-p dribble-file))
(gnus-set-file-modes dribble-file modes))
(goto-char (point-min))
(when (search-forward "Gnus was exited on purpose" nil t)

6
lisp/htmlfontify.el
View file

@ -1938,9 +1938,9 @@ adding an extension of `hfy-extn'. Fontification is actually done by
(set-buffer html)
(write-file (concat target hfy-extn))
(kill-buffer html))
;; #o0200 == 128, but emacs20 doesn't know that
(if (and (file-exists-p target) (not (file-writable-p target)))
(set-file-modes target (logior (file-modes target) 128)))
(let ((modes (file-modes target)))
(if (and modes (not (file-writable-p target)))
(set-file-modes target (logior modes #o0200))))
(copy-file (buffer-file-name source) target 'overwrite))
(kill-buffer source)) ))

6
lisp/server.el
View file

@ -563,9 +563,9 @@ See variable `server-auth-dir' for details."
(format "it is not owned by you (owner = %s (%d))"
(user-full-name uid) uid))
(w32 nil) ; on NTFS?
((/= 0 (logand ?\077 (file-modes dir)))
(format "it is accessible by others (%03o)"
(file-modes dir)))
((let ((modes (file-modes dir)))
(unless (zerop (logand (or modes 0) #o077))
(format "it is accessible by others (%03o)" modes))))
(t nil))))
(when unsafe
(error "`%s' is not a safe directory because %s"