Linux Lover wrote:
Arko Provo Mukherjee wrote:
Hello,
I think you didn't get the point. When writing the CD it is done in raw
mode and you don't need to mount. So the permissions given during
mounting doesn't matter.
Hope that helps.
Arko
Good help. Satisfied with this explaination. Now, what is ringing to
my mind is that, in similar way, may some virus or spyware get access
into our read only hard disks (better to say read only partitions in
my hard disk) too?
Regards
Anindya
So we are agreed that if a device is not mounted then the permissions
stated in /etc/fstab don't matter. Individual files and directories on
such a device will not be accessible in the usual way.
However, in that case we may still read/write from/to the raw device
provided the permissions on this device are right. For example, on my PC
which runs Linux Red Hat 8.0, the cd-writer is /dev/scd0 and here are
the permissions:
6108 0 brw-rw-rw- 1 root disk 11, 0 Aug 31 2002
/dev/scd0
As you can see, root is the owner of this device but everyone has read
and write permissions to it. On this same system the permissions for the
first hard disk (/dev/hda) and its partitions are:
4524 0 brw-rw---- 1 root disk 3, 0 Aug 31 2002
/dev/hda
4525 0 brw-rw---- 1 root disk 3, 1 Aug 31 2002
/dev/hda1
4536 0 brw-rw---- 1 root disk 3, 2 Aug 31 2002
/dev/hda2
4547 0 brw-rw---- 1 root disk 3, 3 Aug 31 2002
/dev/hda3
4551 0 brw-rw---- 1 root disk 3, 4 Aug 31 2002
/dev/hda4
4552 0 brw-rw---- 1 root disk 3, 5 Aug 31 2002
/dev/hda5
so only root and users belonging to group `disk' may read/write from/to
this disk. Therefore unless a virus runs with root privileges (or
manages to run with the privileges of a user belonging to the `disk'
group) it cannot access the raw disk devices.
When the disk partitions are mounted then of course access is possible
through the file system and the individual file or directory file
permissions apply.
- Manas Laha
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