On Wed, 1 May 2019, Christoph Hellwig wrote:
I successfully tested toggling the MBR done flag and writing the shadow MBR
using some tools I hacked together[4] with a Samsung SSD 850 EVO drive.
Can you submit the tool to util-linux so that we get it into distros?
There is already Scott's sed-opal-temp[1] and a fork by Jonas that adds
support for older version of these new IOCTLs[2]. There was already some
discussion of getting that to util-linux.[3]
While I like my hack, sed-opal-temp can do much more (my tool supports
just the few things I actually use). But there are two things which
sed-opal-temp currently lacks which my hack has:
* It can use a PBKDF2 hash (salted by disk serial number) of the password
rather than the password directly. This makes it compatible with sedutil
and I think it's also better practice (as firmware can contain many
surprises).
* It contains a 'PBA' (pre-boot authorization) tool. A tool intended to be
run from shadow mbr that asks for a password and uses it to unlock all
disks and set shadow mbr done flag, so after restart the computer boots
into the real OS.
@Scott: What are your plans with sed-opal-temp? If you want I can update
Jonas' patches to the adapted IOCTLs. What are your thoughts on PW hashing
and a PBA tool?
Best regards,
David
[1] https://github.com/ScottyBauer/sed-opal-temp
[2] https://github.com/ghostav/sed-opal-temp
[3] https://lkml.org/lkml/2019/2/4/736
