> On 25 Sep 2022, at 04:42, Robert Nichols <rnicholsnos...@comcast.net> wrote: > > On 9/24/22 9:31 PM, Tim via users wrote: >> On Sat, 2022-09-24 at 11:14 -0500, Robert Nichols wrote: >>> If you follow the recommendation to fill the device with random data first >> When was that ever recommended, and where? >> While a logical thing to do, I've never seen anything or anyone ever >> say that. > > I recall that recommendation being in the cryptsetup FAQ, but it doesn't seem > to be there any more. > > A device that was not initialized with random data is going to allow some > information about the usage pattern to be leaked. As a simple example, a > device that had only been filled only to a small fraction of its capacity > would reveal, through the pattern of its metadata blocks, what filesystem was > employed. It's the same reason that passthrough of SSD discard (TRIM) > commands through the LUKS layer is blocked unless explicitly enabled. (See > the comments for the "--allow-discards" option in the cryptsetup manpage for > details.)
I expect that you can find the usage pattern by accessing the ware levelling data in the SSD. Init with random data will not help on an SSD. > > I doubt that is a practical concern for anyone reading this. I know I don't > worry about it. Indeed. Barry > > -- > Bob Nichols "NOSPAM" is really part of my email address. > Do NOT delete it. > _______________________________________________ > users mailing list -- users@lists.fedoraproject.org > To unsubscribe send an email to users-le...@lists.fedoraproject.org > Fedora Code of Conduct: > https://docs.fedoraproject.org/en-US/project/code-of-conduct/ > List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines > List Archives: > https://lists.fedoraproject.org/archives/list/users@lists.fedoraproject.org > Do not reply to spam, report it: > https://pagure.io/fedora-infrastructure/new_issue _______________________________________________ users mailing list -- users@lists.fedoraproject.org To unsubscribe send an email to users-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@lists.fedoraproject.org Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
