[gentoo-user] I (user) can write to / ... but why?

[Ralph Slooten <axllent@gmail.com>]

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Hiya all,

Now I feel *really* stupid asking this, but for the life of me I cannot
work it out. On two machines here at home I discovered that I can write
as a particular normal user to the root partition (/). This also means I
can rename /root to /root1 if I want (I just tried), and create / delete
files on / too. The strange thing is this does not work for another
account (wife's) on the same machine, which seems to have the same
permissions. It's almost like / is getting mounted by user "axllent"
here. Other partitions that get mounted do not work, just /

I have checked fstab:
/dev/hda3    /     reiserfs    noatime       0 0

In /etc/lilo.conf (on one machine that uses it) I have:
image=/boot/vmlinuz-2.6.11.10
        label="2.6.11.10"
        root=/dev/hda3
        vga=791
        read-only

the permissions of /dev/hda3 are:
axllent@workstation ~ $ ll /dev/hda3
lr-xr-xr-x  1 root root 33 Aug 15 18:55 /dev/hda3 ->
ide/host0/bus0/target0/lun0/part3

axllent@workstation ~ $ ll /dev/ide/host0/bus0/target0/lun0/part3
brw-------  1 root root 3, 3 Jan  1  1970
/dev/ide/host0/bus0/target0/lun0/part3

My groups for this user on both machines are:
wheel audio cdrom games cdrw usb users portage
&
wheel audio at usb users

My wife who cannot write to / has
wheel audio games usb users

Using Reiserfs3.

Does anyone have any idea what's causing this, and possibly how I can
make / read-only?

Greetings
Ralph
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