Re: gid option on ext3 in fstab

On Tue, Oct 17, 2006 at 11:28:14PM +0200, Lars Staun Knudsen wrote:
Hi

I want all files on a partition, used as a nfs-share, to have
"utysket" as group. Earlier I had a script to run every second hour
to set the right group. But then i remembered the gid option in fstab.
/dev/hdc1 /Lager/01 ext3 gid=utysket,noexec,defaults
0 2

But it doesn't work:
main:~# mount /Lager/01/
mount: wrong fs type, bad option, bad superblock on /dev/hdc1,
missing codepage or other error
In some cases useful info is found in syslog - try
dmesg | tail or so

EXT3-fs: Unrecognized mount option "gid=1002" or missing value

I use the same option on my laptop (mounting vfat partition), and it
works. So i don't what to do different.

The gid and uid mount options only work with file systems such
as vfat, which do not have a uid and gid for each file. Instead, you
could use "chmod g+s".

BTW how much real difference do extra mount option, such as noexec
and etc., do to enhance security?

They do what they say, not allowing exec, suid, etc. on a mounted file
system. Imagine if someone could mount a floppy or USB drive containing
an suid root shell.


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