Re: Why Ext2/3 needs immutable attribute?

[Kyle Moffett <mrmacman_g4@mac.com>]

On Apr 23, 2005, at 15:12, DervishD wrote:
>  * Kyle Moffett <mrmacman_g4@mac.com> dixit:
> > > another usage:  if you "chattr +i /var" while /var is unmounted,
> > > then root is unlikely to accidentally create files/dirs in /var --
> > > and when you mount the real /var on top it works fine.  i tend to
> > > protect all my mount points this way (especially those in /mnt) to
> > > avoid my own dumb mistakes.
> > If you chmod 000 /var beforehand (While it's still unmounted, of
> > course), then it's also blindingly obvious that it's not mounted in
> > an ls -l :-D. I too have used this trick on many/most of my
> > systems.
> I was doing exactly that, but it has its drawbacks: root still
> can create files by accident. [...]

Ah, I meant in combination with the above trick:

# umount /var
# chmod 000 /var
# chattr +i /var
# ls -alhd /var
d---------    2 root     root       68 Apr 23 16:36 /var
# mount /var

If I forget to mount var, not only can I not create files, I'll also
notice when I "ls -alh /".

Cheers,
Kyle Moffett

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