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The key offloaded in kernel keyring service is only referenced (by key description) in dm-crypt target and the VK is therefore no longer stored directly in dm-crypt target. Starting with cryptsetup 2.0 we load VK in kernel keyring by default for LUKSv2 devices (when dm-crypt with the feature is available). Currently cryptsetup loads VK in 'logon' type kernel key so that VK is passed in the kernel and can't be read from userspace afterward. Also cryptsetup loads VK in thread keyring (before passing the reference to dm-crypt target) so that the key lifetime is directly bound to the process that performs the dm-crypt setup. When cryptsetup process exits (for whatever reason) the key gets unlinked in kernel automatically. In summary, the key description visible in dm-crypt table line is a reference to VK that usually no longer exists in kernel keyring service if you used cryptsetup to for device activation. Using this feature dm-crypt no longer maintains a direct key copy (but there's always at least one copy in kernel crypto layer). II) Keyslot passphrase The second use case for kernel keyring is to allow cryptsetup reading the keyslot passphrase stored in kernel keyring instead. The user may load passphrase in kernel keyring and notify cryptsetup to read it from there later. Currently, cryptsetup cli supports kernel keyring for passphrase only via LUKS2 internal token (luks2-keyring). Library also provides a general method for device activation by reading passphrase from keyring: crypt_activate_by_keyring(). The key type for use case II) must always be 'user' since we need to read the actual key data from userspace unlike with VK in I). Ability to read keyslot passphrase from kernel keyring also allows easily auto-activate LUKS2 devices. Simple example how to use kernel keyring for keyslot passphrase: 1) create LUKS2 keyring token for keyslot 0 (in LUKS2 device/image) cryptsetup token add --key-description my:key -S 0 /dev/device 2) Load keyslot passphrase in user keyring read -s -p "Keyslot passphrase: "; echo -n $REPLY | keyctl padd user my:key @u 3) Activate device using passphrase stored in kernel keyring cryptsetup open /dev/device my_unlocked_device 4a) unlink the key when no longer needed by keyctl unlink %user:my:key @u 4b) or revoke it immediately by keyctl revoke %user:my:key If cryptsetup asks for passphrase in step 3) something went wrong with keyring activation. See --debug output then.