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Message-ID: <alpine.LRH.2.21.1905032058110.30331@linux.fjfi.cvut.cz> Date: Fri, 3 May 2019 22:32:19 +0200 (CEST) From: David Kozub <zub@...ux.fjfi.cvut.cz> To: Christoph Hellwig <hch@...radead.org>, Scott Bauer <sbauer@...donthack.me> cc: Jens Axboe <axboe@...nel.dk>, Jonathan Derrick <jonathan.derrick@...el.com>, linux-block@...r.kernel.org, linux-kernel@...r.kernel.org, Jonas Rabenstein <jonas.rabenstein@...dium.uni-erlangen.de> Subject: Re: [PATCH 0/3] block: sed-opal: add support for shadow MBR done flag and write 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
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