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Operating Systems Linux grant root privileges to ordinary user Post 302233999 by ankurjain on Tuesday 9th of September 2008 12:11:48 AM
Old 09-09-2008
From man mount :

Quote:
(iii) Normally, only the superuser can mount file systems. However, when fstab contains the user option on
a line, anybody can mount the corresponding system.

Thus, given a line
/dev/cdrom /cd iso9660 ro,user,noauto,unhide
any user can mount the iso9660 file system found on his CDROM using the command
mount /dev/cdrom
or
mount /cd
For more details, see fstab(5). Only the user that mounted a filesystem can unmount it again. If any user
should be able to unmount, then use users instead of user in the fstab line. The owner option is similar to
the user option, with the restriction that the user must be the owner of the special file. This may be use-
ful e.g. for /dev/fd if a login script makes the console user owner of this device. The group option is
similar, with the restriction that the user must be member of the group of the special file.
Regards
-AJ
 

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MOUNT_MSDOS(8)						    BSD System Manager's Manual 					    MOUNT_MSDOS(8)

NAME
mount_msdos -- mount an MS-DOS file system SYNOPSIS
mount_msdos [-o options] [-u uid] [-g gid] [-m mask] special node DESCRIPTION
The mount_msdos command attaches the MS-DOS filesystem residing on the device special to the global filesystem namespace at the location indicated by node. This command is normally executed by mount(8) at boot time, but can be used by any user to mount an MS-DOS file system on any directory that they own (provided, of course, that they have appropriate access to the device that contains the file system). The options are as follows: -o options Use the specified mount options, as described in mount(8). -u uid Set the owner of the files in the file system to uid. The default owner is the owner of the directory on which the file system is being mounted. -g gid Set the group of the files in the file system to gid. The default group is the group of the directory on which the file system is being mounted. -m mask Specify the maximum file permissions for files in the file system. (For example, a mask of 755 specifies that, by default, the owner should have read, write, and execute permissions for files, but others should only have read and execute permissions. See chmod(1) for more information about octal file modes.) Only the nine low-order bits of mask are used. The default mask is taken from the directory on which the file system is being mounted. SEE ALSO
mount(2), unmount(2), fstab(5), mount(8) CAVEATS
FreeBSD 2.1 and earlier versions could not handle cluster sizes larger than 16K. Just mounting an MS-DOS file system could cause corruption to any mounted file system. Cluster sizes larger than 16K are unavoidable for file system sizes larger than 1G, and also occur when filesys- tems larger than 1G are shrunk to smaller than 1G using FIPS. HISTORY
The mount_msdos utility first appeared in FreeBSD 2.0. Its predecessor, the mount_pcfs utility appeared in FreeBSD 1.0, and was abandoned in favor of the more aptly-named mount_msdos. BSD
April 7, 1994 BSD
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