271
submitted 7 months ago by communism@lemmy.ml to c/linux@lemmy.ml

[Image description:
Screenshot of terminal output:

~ ❯ lsblk
NAME           MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINTS
sda              8:0    1  62.5M  0 disk  
└─topLuks      254:2    0  60.5M  0 crypt 
  └─bottomLuks 254:3    0  44.5M  0 crypt

/end image description]

I had no idea!

If anyone else is curious, it's pretty much what you would expect:

cryptsetup -y -v luksFormat /dev/sda
cryptsetup open /dev/sda topLuks
cryptsetup -y -v luksFormat /dev/mapper/topLuks
cryptsetup open /dev/mapper/topLuks bottomLuks
lsblk

Then you can make a filesystem and mount it:

mkfs.ext4 /dev/mapper/bottomLuks
mount /dev/mapper/bottomLuks ~/mnt/embeddedLuksTest

I've tested putting files on it and then unmounting & re-encrypting it, and the files are indeed still there upon decrypting and re-mounting.

Again, sorry if this is not news to anyone else, but I didn't realise this was possible before, and thought it was very cool when I found it out. Sharing in case other people didn't know and also find it cool :)

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[-] Max_P@lemmy.max-p.me 60 points 7 months ago

Yeah, LUKS and most block level overlays just don't care. That's what good abstraction layers do for you!

You can LUKS on a disk image mounted over SSHFS that itself resides on a Ceph cluster and mounted over iSCSI for all it cares. Is it a block device? Yes? Good to go.

You can even LUKS a floppy if you want. Or a CD.

[-] hperrin@lemmy.world 34 points 7 months ago

You wouldn’t LUKS a floppy?

[-] MigratingtoLemmy@lemmy.world 11 points 7 months ago

I absolutely will, if I can find one

[-] tgxn@lemmy.tgxn.net 5 points 7 months ago

And a suitable reader that my computer knows how to talk to.

[-] MigratingtoLemmy@lemmy.world 6 points 7 months ago

Connections to the reader need to be encrypted or I don't want it

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this post was submitted on 19 Mar 2024
271 points (97.9% liked)

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Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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