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[bug#51514] [PATCH v2 2/3] doc: Document LUKS2 GRUB support and shortcom
From: |
Josselin Poiret |
Subject: |
[bug#51514] [PATCH v2 2/3] doc: Document LUKS2 GRUB support and shortcomings |
Date: |
Mon, 15 Nov 2021 20:53:40 +0000 |
* doc/guix.texi (Keyboard Layout, Networking, and Partitioning)[Disk
Partitioning]: Document it.
---
doc/guix.texi | 22 +++++++++++++++++-----
1 file changed, 17 insertions(+), 5 deletions(-)
diff --git a/doc/guix.texi b/doc/guix.texi
index 1b10e2d626..95d286a836 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -98,6 +98,7 @@ Copyright @copyright{} 2021 pukkamustard@*
Copyright @copyright{} 2021 Alice Brenon@*
Copyright @copyright{} 2021 Andrew Tropin@*
Copyright @copyright{} 2021 Sarah Morgensen@*
+Copyright @copyright{} 2021 Josselin Poiret@*
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
@@ -2492,13 +2493,24 @@ mkfs.ext4 -L my-root /dev/sda2
If you are instead planning to encrypt the root partition, you can use
the Cryptsetup/LUKS utilities to do that (see @inlinefmtifelse{html,
@uref{https://linux.die.net/man/8/cryptsetup, @code{man cryptsetup}},
-@code{man cryptsetup}} for more information). Assuming you want to
-store the root partition on @file{/dev/sda2}, the command sequence would
-be along these lines:
+@code{man cryptsetup}} for more information).
+
+@quotation Warning
+Note that GRUB can unlock LUKS2 devices since version 2.06, but only
+supports the PBKDF2 key derivation function, which is not the default
+for @command{cryptsetup luksFormat}. You can check which key derivation
+function is being used by a device by running @command{cryptsetup
+luksDump @var{device}}, and looking for the PBKDF field of your
+keyslots.
+@end quotation
+
+Assuming you want to store the root partition on @file{/dev/sda2}, the
+command sequence to format it as a LUKS2 partition would be along these
+lines:
@example
-cryptsetup luksFormat /dev/sda2
-cryptsetup open --type luks /dev/sda2 my-partition
+cryptsetup luksFormat --type luks2 --pbkdf pbkdf2 /dev/sda2
+cryptsetup open /dev/sda2 my-partition
mkfs.ext4 -L my-root /dev/mapper/my-partition
@end example
--
2.33.1