Howto umount a cdrom as non-root?

[Lowell Gilbert]

"Edd Barrett" <edd at arameus.net> writes:

> I have used vfs.usermount=1 to allow users to mount the cdrom in a dir in
> thier home dir. What is the most proper and secure method of doing so. If
> possible without the use of sudo or chmod +s.

If the users can mount the disk, they should be able to umount it as
well.  [I just checked; it works for me, on both -STABLE and
-CURRENT.]  This is not occurring on your system?  What version?  What
*does* happen when the user tries the umount?