Mailinglist Archive: opensuse-security (471 mails)

[MaD dUCK <madduck@xxxxxxxxxxx>]

hi,
on a couple of linux machines that are public workstations (i.e. a number of
people have accounts and should be able to use the machines), i changed the
permissions of /dev/cdrom to 0644 and /dev/fd0 to 0666 to enable the users
to access the cdrom and floppy freely. the same (0666) was done for /dev/ttyS? -
the users need access to the serial ports. a little while later, however, we
had to discover that the permissions had been arbitrarily reset.

/dev/fd0 went 0660 and got owned by the last user, group floppy.
/dev/cdrom went 0600 <user>.disk
/dev/ttyS0 went 0660 root.uucp

??? why does this happen? i noticed the /dev entries changing permissions and
ownership whenever they felt like it. that's not how it's supposed to be. when
i set fd0 to 0666 root.floppy, i intend it to stay like that until i change it.
what is responsible for this change and how can i prevent it?

thanks,
martin

  madduck@xxxxxxxxxxx

(greetings from the heart of the sun)