On Mon, Jun 17, 2013 at 9:47 AM, Arun Khan <[email protected]> wrote: > On Mon, Jun 17, 2013 at 12:08 AM, <[email protected]> wrote: > > Friends, > > > > With so much espionage happening in computers, I was wondering whether a > read only mounted partition is read only by software only or is there an > electrical lock on the hdd, which does not seem possible for > multi-partition disks as another partition may be writeable. > > No electrical lock. Anyone with root/sudo (with rights to mount) can > do 'mount -o remount,rw <fs_dir_tree>' > > > > > Can a malicious software gain control of the electrical side of the hdd > and modify or delete data, even on a read only mounted partition? For the > military then, would it be better to use an entire disk as a single > partition and lock it down electrically? > > The 3.5" disks have pin outs, one of these pairs can be jumpered to > make the *entire* disk 'ro' - this takes care of remote root/sudo > scenarios. Anyone with physical access can easily remove the jumper > and make the *entire* disk 'rw' >
Afair the jumper is not hardwired and a trojan bios (or raw driver) can ignore the lock. > -- > Arun Khan > Sent from my non-iphone/non-android device > (অরুণ খান্/अरुण खान) > -- > http://mm.ilug-bom.org.in/mailman/listinfo/linuxers -- http://mm.ilug-bom.org.in/mailman/listinfo/linuxers
