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    SubjectRe: About /etc/mtab and /proc/mounts
    Date
    mru@users.sourceforge.net (Måns Rullgård) writes:

    > Olaf Dietsche <olaf.dietsche@t-online.de> writes:
    >
    >> The 'user' option is in /etc/fstab, so this is not a problem. I can
    >> mount _and_ umount /cdrom as a simple user.
    >
    > It's strange if you can. My mount (fairly recent) looks in fstab to
    > determine whether a user should be allowed to mount a device.
    > However, when unmounting it checks /etc/mtab to make sure it was you
    > who mounted it in the first place, making it impossible to unmount
    > someone else's cdrom. If you use the 'users' (note the 's') option
    > instead any user can mount or unmount the device at any time, mtab
    > being ignored.

    I just verified it. I and anybody else can mount and umount /cdrom. If
    I mounted /cdrom, someone else can umount it.

    $ mount -V
    mount: mount-2.11n

    $ grep user /etc/fstab
    /dev/hdb/0 /cdrom iso9660 defaults,ro,unhide,user,noauto,noexec,nosuid 0 2

    $ ls -l /etc/mtab
    lrwxrwxrwx 1 root root 12 2002-09-22 02:58 /etc/mtab -> /proc/mounts

    When /etc/mtab is a regular file, it works as you described.

    Regards, Olaf.
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