[gentoo-user] problems with udev

[renna]

hi to all
i'm having some problems, with, i think, the permissions 
of /dev/null /dev/console and /dev/zero. every time i boot they're set up to 
660, like this

crw-rw----  1 renna root 5, 1 Jul 13 17:04 /dev/console
crw-rw----  1 root  root 1, 3 Apr  9 06:31 /dev/null
crw-rw----  1 root  root 1, 5 Apr  9 06:31 /dev/zero

so when i login as a normal user, i get
/dev/null: Permission denied

and i have to
chmod 666 /dev/null

to be able to login in kde

furthermore, in kde, when i launch konsole, the window of konsole shows up, 
but there's only the cursor blinking, and i cannot enter commands - i have to 
ctrl+alt+fn to a terminal
and allways in kde, when i launch a program that requires root's password, as 
kuser, i get a window with this message

The program 'su' is not found;
make sure your PATH is set correctly.

though su, which is perfectly working in a terminal, is in /bin which IS in my 
PATH

i really don't know if these problems in kde are correlated with the 
permissions in dev, but on google i found many persons having problems with 
udev and having more or less the same problems (though i couldn't find a 
solution to my case). i tried, as explained on 
http://www.gentoo.org/doc/en/udev-guide.xml#doc_chap3
to mknod new null and console in /dev, but when i boot the permissions are 
again set to 660. 
does somebody have an idea of what i should do? if there's some information i 
lacked to give please ask
thanks
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