Missing DM module??? during drive encyrption

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euless:
HI,

When I try to encrypt a thumbdrive, I get error message about "Cannot initialize device-mapper. Is dm_mod kernel module loaded?".

How do I get this dm_mod and how do I load it?

Thanks!!!

--- Quote ---root@box:/home/tc# cryptsetup luksFormat --type luks2 /dev/sdd
WARNING: Device /dev/sdd already contains a 'crypto_LUKS' superblock signature.

WARNING!
========
This will overwrite data on /dev/sdd irrevocably.

Are you sure? (Type 'yes' in capital letters): YES
Enter passphrase for /dev/sdd:
Verify passphrase:
root@box:/home/tc# cryptsetup open /dev/sdd root
Cannot initialize device-mapper. Is dm_mod kernel module loaded?
Cannot use device root, name is invalid or still in use.
Enter passphrase for /dev/sdd:
Cannot initialize device-mapper. Is dm_mod kernel module loaded?
Cannot use device root, name is invalid or still in use.

--- End quote ---

gadget42:
did a forum search for dm_mod and briefly scanned them, perhaps this one might help:

https://forum.tinycorelinux.net/index.php/topic,21613.msg135266.html#msg135266

Rich:
Hi euless
I think you want to install raid-dm-KERNEL.tcz

euless:

--- Quote from: Rich on November 11, 2024, 10:51:22 AM ---Hi euless
I think you want to install raid-dm-KERNEL.tcz

--- End quote ---

OK. The dm module is actually in raid-dm-6.6.8-tinycore64.tcz. After I installed this, that error message no longer appear.

But there is another problem. It freezes on "cryptsetup open ...". Any idea?

Thanks!!!

euless:

--- Quote from: Rich on November 11, 2024, 10:51:22 AM ---Hi euless
I think you want to install raid-dm-KERNEL.tcz

--- End quote ---

Here is the debug report if that helps. Thanks!!!

--- Code: ---root@box:/home/tc# cryptsetup --debug open /dev/sdd1 root
# cryptsetup 2.7.2 processing "cryptsetup --debug open /dev/sdd1 root"
# Verifying parameters for command open.
# Running command open.
# Installing SIGINT/SIGTERM handler.
# Unblocking interruption on signal.
# Allocating context for crypt device /dev/sdd1.
# Trying to open and read device /dev/sdd1 with direct-io.
# Initialising device-mapper backend library.
# Trying to load any crypt type from device /dev/sdd1.
# Crypto backend (OpenSSL 3.2.0 23 Nov 2023 [default][legacy][threads][argon2]) initialized in cryptsetup library version 2.7.2.
# Detected kernel Linux 6.6.8-tinycore64 x86_64.
# Loading LUKS2 header (repair disabled).
# Acquiring read lock for device /dev/sdd1.
# Locking directory /run/cryptsetup will be created with default compiled-in per missions.
# Opening lock resource file /run/cryptsetup/L_8:49
# Verifying lock handle for /dev/sdd1.
# Device /dev/sdd1 READ lock taken.
# Trying to read primary LUKS2 header at offset 0x0.
# Opening locked device /dev/sdd1
# Verifying locked device handle (bdev)
# LUKS2 header version 2 of size 16384 bytes, checksum sha256.
# Checksum:914697c4580e982e44944f313790202a65d2f9451b5f860c5233a8c57cf8b692 (on- disk)
# Checksum:914697c4580e982e44944f313790202a65d2f9451b5f860c5233a8c57cf8b692 (in- memory)
# Trying to read secondary LUKS2 header at offset 0x4000.
# Reusing open ro fd on device /dev/sdd1
# LUKS2 header version 2 of size 16384 bytes, checksum sha256.
# Checksum:a40a8375b34aff531e9ea8209ca7bfb962b432e077e29339e92b6636ba70bdee (on- disk)
# Checksum:a40a8375b34aff531e9ea8209ca7bfb962b432e077e29339e92b6636ba70bdee (in- memory)
# Device size 1073741824, offset 16777216.
# Device /dev/sdd1 READ lock released.
# PBKDF argon2id, time_ms 2000 (iterations 0), max_memory_kb 1048576, parallel_t hreads 4.
# Activating volume root [keyslot -1] using token.
# Creating directory "/dev/mapper"
# Creating device /dev/mapper/control (10, 236)
# dm version [ opencount flush ] [16384] (*1)
# dm versions [ opencount flush ] [16384] (*1)
# Detected dm-ioctl version 4.48.0.
# Device-mapper backend running with UDEV support enabled.
# dm status root [ opencount noflush ] [16384] (*1)
No usable token is available.
# Interactive passphrase entry requested.
Enter passphrase for /dev/sdd1:
# Activating volume root [keyslot -1] using passphrase.
# dm versions [ opencount flush ] [16384] (*1)
# dm status root [ opencount noflush ] [16384] (*1)
# Keyslot 0 priority 1 != 2 (required), skipped.
# Trying to open LUKS2 keyslot 0.
# Running keyslot key derivation.
# Reading keyslot area [0x8000].
# Acquiring read lock for device /dev/sdd1.
# Opening lock resource file /run/cryptsetup/L_8:49
# Verifying lock handle for /dev/sdd1.
# Device /dev/sdd1 READ lock taken.
# Reusing open ro fd on device /dev/sdd1
# Device /dev/sdd1 READ lock released.
# Verifying key from keyslot 0, digest 0.
# Digest 0 (pbkdf2) verify failed with -1.
No key available with this passphrase.
# Interactive passphrase entry requested.
Enter passphrase for /dev/sdd1:
# Activating volume root [keyslot -1] using passphrase.
# dm versions [ opencount flush ] [16384] (*1)
# dm status root [ opencount noflush ] [16384] (*1)
# Keyslot 0 priority 1 != 2 (required), skipped.
# Trying to open LUKS2 keyslot 0.
# Running keyslot key derivation.
# Reading keyslot area [0x8000].
# Acquiring read lock for device /dev/sdd1.
# Opening lock resource file /run/cryptsetup/L_8:49
# Verifying lock handle for /dev/sdd1.
# Device /dev/sdd1 READ lock taken.
# Reusing open ro fd on device /dev/sdd1
# Device /dev/sdd1 READ lock released.
# Verifying key from keyslot 0, digest 0.
# dm versions [ opencount flush ] [16384] (*1)
# Loading key (type logon, name cryptsetup:a56dfa88-2169-4463-9e09-06d04fd5f7ed- d0) in thread keyring.
# dm versions [ opencount flush ] [16384] (*1)
# dm status root [ opencount noflush ] [16384] (*1)
# Calculated device size is 2064384 sectors (RW), offset 32768.
# dm versions [ opencount flush ] [16384] (*1)
# DM-UUID is CRYPT-LUKS2-a56dfa88216944639e0906d04fd5f7ed-root
# Udev cookie 0xd4d1a77 (semid 0) created
# Udev cookie 0xd4d1a77 (semid 0) incremented to 1
# Udev cookie 0xd4d1a77 (semid 0) incremented to 2
# Udev cookie 0xd4d1a77 (semid 0) assigned to CREATE task(0) with flags DISABLE_ LIBRARY_FALLBACK (0x20)
# dm create root CRYPT-LUKS2-a56dfa88216944639e0906d04fd5f7ed-root [ opencount f lush ] [16384] (*1)
# dm reload root [ opencount flush securedata ] [16384] (*1)
# dm resume root [ opencount flush securedata ] [16384] (*1)
# root: Stacking NODE_ADD (251,0) 0:0 0600 [trust_udev]
# root: Stacking NODE_READ_AHEAD 256 (flags=1)
# Udev cookie 0xd4d1a77 (semid 0) decremented to 1
# Udev cookie 0xd4d1a77 (semid 0) waiting for zero
--- End code ---

[Edit]: Changed quote tags to code tags. Rich

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