Feature Request: disallow world-writable files in chmod

[Ben Lentz]

I suspect I may get laughed off the list... but would you folks ever
consider restricting the use of chmod such that world-writable files
are reserved for 1) /tmp-style permissions (1777) or 2) reserved for
root-only users? Despite training (berating?) users, it seems the
default reaction to "oh no, I am having a permission problem" is an
knee-jerk execution of "chmod -R 777 *" in order to make the 'problem'
go away... however all it's really done is *move* the problem...

I realize this may break things - a lot of things - stuff I'm not
considering - of course you could always wrap in a set of ifdef tags
and make it non-default?

*** src/chmod.c Wed Jun 26 16:16:28 2013
--- src/chmod.c Wed Jun 26 17:57:17 2013
***************
*** 244,249 ****
--- 244,258 ----
        new_mode = mode_adjust (old_mode, S_ISDIR (old_mode) != 0, umask_value,
                              change, NULL);

+       if ((new_mode & S_IWOTH) && !(new_mode & S_ISVTX) && (getuid() != 0))
+         {
+           error (0, 0, _("world-writable permissions have been
restricted by your system administrator"));
+           ok = false;
+         }
+      }
+
+   if (ok)
+     {
        if (! S_ISLNK (old_mode))
        {
          if (chmodat (fts->fts_cwd_fd, file, new_mode) == 0)