[plug] Just started with linux, need help

[Beau Kuiper]

On Tue, 05 Oct 1999, you wrote:
> On Mon, 4 Oct 1999, Christian wrote:
> > Brad Campbell wrote:
> > > Have you checked, that the user your trying to mount from has the 'user'
> > > group in thier list.
> > > Or possibly the cdrom, disk, or floppy group ?
> > You don't have to be in any specials groups at all to be able to mount
> > devices specified with the "user" option in fstab.  *Any* user can mount
> > the device if this option is enabled.
> 
> Really? I'd be absolutely shocked if the kernel's behaviour was affected
> by a file in /etc at runtime. I'm _sure_ you still have to be root to
> mount a volume, regardless of the contents of fstab. AFAIU, fstab is
> entirely for the benefit of the mount program. As such, you will need to
> have permission to run mount as root. For this, mount must be SUID, be
> owned by user root, and belong some group of which you are a member, (or
> else world executable, which is not a good idea) and executable by the
> group. Hence:

Slackware 4.0 already has mount set uid root, and world executable (not a
problem because it does its own filtering of requests). I assume most other
distributions have mount as set uid root.

Beau Kuiper

 chown
root.$GROUP `which pppd` > chmod 4750 `which pppd`
> 
> Will do the trick, where $GROUP is the appropriate dialout group for
> Redhat, and you have editted /etc/groups to put yourself in that group.
> Could some Redhat-using sadist let us know the value of $GROUP? Thanks.
> 
> Perhaps even better would be to do:
> ls -l `which pppd`
> instead, which should tell you what group owns the pppd binary,
> then you just need to make sure you are in that group, and do the chmod.
> 
> If Unix file permissions confuse you, you either need to look them up
> online, or you need to buy the aforementioned book.
> 
> -Greg