From: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: emacs-devel@gnu.org
Subject: Re: backup method
Date: Sun, 30 Jan 2005 19:57:28 -0500 [thread overview]
Message-ID: <874qgyxw24.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <E1CvPIT-0007av-GN@fencepost.gnu.org> (Richard Stallman's message of "Sun, 30 Jan 2005 19:20:05 -0500")
>> So I suggest not making backupfiles in world-writable directories.
> This change would be a disastrous surprise.
> (My home directory used to be world-writable. Maybe it still is, on
> fencepost--I can't check from here.)
In a world-writable directory, editing with a backup file is dangerous:
- if backup-by-copying is t, then when writing the backup file we may follow
a symlink (planted by some other user) to some important file.
- if backup-by-copying is nil, the rename-file to create the backup is safe
(as long as it doesn't do a copy behind the scenes, of course), but the
main file will be written to in a way that will happily follow a symlink
(planted by some other user) to some important file.
Here are the possible answers I can think of:
- who cares, we lived with it for so long already.
- I trust other users not to try to play such nasty games.
- don't make backups in world-writable directories (we already do that for
the most common world-writable directory: /tmp).
- take special precautions when making a backup in
a world-writable directory (use make-temp-file & rename, for example, or
save to some other place).
Stefan
next prev parent reply other threads:[~2005-01-31 0:57 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-27 0:02 backup method Han Boetes
2005-01-27 0:45 ` Luc Teirlinck
2005-01-27 1:20 ` Miles Bader
2005-01-27 1:37 ` Luc Teirlinck
2005-01-27 1:54 ` Han Boetes
2005-01-27 22:18 ` Richard Stallman
2005-01-28 3:56 ` Han Boetes
2005-01-29 4:16 ` Richard Stallman
2005-01-29 6:08 ` Han Boetes
2005-01-29 18:42 ` Luc Teirlinck
2005-01-29 21:06 ` Stefan Monnier
2005-01-29 21:48 ` Luc Teirlinck
2005-01-29 22:37 ` Luc Teirlinck
2005-01-29 22:49 ` Luc Teirlinck
2005-01-29 21:57 ` Luc Teirlinck
2005-01-29 22:05 ` Luc Teirlinck
2005-01-29 22:52 ` Han Boetes
2005-01-29 23:50 ` Stefan Monnier
2005-01-30 21:52 ` Han Boetes
2005-01-31 0:20 ` Richard Stallman
2005-01-31 0:57 ` Stefan Monnier [this message]
2005-02-01 13:30 ` Richard Stallman
2005-02-01 14:09 ` Stefan Monnier
2005-02-03 6:40 ` Richard Stallman
2005-02-03 9:27 ` David Kastrup
2005-02-03 10:15 ` Han Boetes
2005-02-05 5:28 ` Richard Stallman
2005-02-05 10:26 ` David Kastrup
2005-02-06 10:29 ` Richard Stallman
2005-01-31 0:20 ` Richard Stallman
2005-01-31 4:07 ` Han Boetes
2005-01-29 20:06 ` Luc Teirlinck
2005-01-30 10:57 ` Richard Stallman
2005-01-30 11:39 ` Han Boetes
2005-01-27 18:25 ` Kevin Rodgers
2005-01-27 20:25 ` Reiner Steib
2005-01-27 23:19 ` Miles Bader
2005-01-27 23:12 ` Miles Bader
2005-01-28 3:55 ` Richard Stallman
2005-01-27 1:47 ` Luc Teirlinck
2005-01-27 2:08 ` Han Boetes
2005-01-27 2:27 ` Han Boetes
2005-01-27 4:59 ` Han Boetes
2005-01-27 2:37 ` Miles Bader
2005-01-27 3:27 ` Han Boetes
2005-01-27 5:08 ` Eli Zaretskii
2005-01-27 5:27 ` Han Boetes
2005-01-27 19:41 ` Eli Zaretskii
2005-01-28 4:14 ` Han Boetes
2005-01-27 8:30 ` Kim F. Storm
2005-01-27 19:55 ` Luc Teirlinck
2005-01-27 21:12 ` Luc Teirlinck
2005-01-27 20:15 ` Luc Teirlinck
2005-01-27 22:19 ` Richard Stallman
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