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Cryptsetup 2.3.6 Release Notes
==============================
Stable bug-fix release with minor extensions.
All users of cryptsetup 2.x and later should upgrade to this version.
Changes since version 2.3.5
~~~~~~~~~~~~~~~~~~~~~~~~~~~
* integritysetup: Fix possible dm-integrity mapping table truncation.
While integritysetup in standalone mode (no encryption) was not
designed to provide keyed (and cryptographically strong) data
integrity protection, some options can use such algorithms (HMAC).
If a key is used, it is directly sent to the kernel dm-integrity as
a mapping table option (no key derivation is performed).
For HMAC, such a key could be quite long (up to 4096 bytes in
integritysetup CLI).
Unfortunately, due to fixed buffers and not correctly checking string
truncation, some parameter combinations could cause truncation
of the dm-integrity mapping table.
In most cases, the table was rejected by the kernel.
The worst possible case was key truncation for HMAC options
(internal_hash and journal_mac dm-integrity table options).
This release fixes possible truncation and also adds more sanity
checks to reject truncated options.
Also, integritysetup now mentions maximal allowed key size
in --help output.
For old standalone dm-integrity devices where the key length was
truncated, you have to modify (shorten) --integrity-key-size
resp. --journal-integrity-key-size option now.
This bug is _not_ present for dm-crypt/LUKS, LUKS2 (including
integrity protection), or dm-verity devices; it affects only
standalone dm-integrity with HMAC integrity protection.
* cryptsetup: Backup header can be used to activate TCRYPT device.
Use --header option to specify the header.
* cryptsetup: Avoid LUKS2 decryption without detached header.
This feature will be added later and is currently not supported.
* Additional fixes and workarounds for common warnings produced
by some static analysis tools (like gcc-11 analyzer) and additional
code hardening.
* Fix standalone libintl detection for compiled tests.
* Add Blake2b and Blake2s hash support for crypto backends.
Kernel and gcrypt crypto backend support all variants.
OpenSSL supports only Blake2b-512 and Blake2s-256.
Crypto backend supports kernel notation e.g. "blake2b-512".
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