nbdkit-release-notes-1.48(1)

NAME
nbdkit-release-notes-1.48 - release notes for nbdkit 1.48

DESCRIPTION
These are the release notes for nbdkit stable release 1.48. This describes the major changes since 1.46.

nbdkit 1.48.0 was released on 14 July 2026.

  Security
Fix minor denial of service vulnerability in nbdkit-blocksize-policy-filter(1) (Eric Blake).

Fix a minor issue with concurrent connections in nbdkit-golang-plugin(3) (AISLE AI security scanner).

Fix two minor denial of service vulnerabilities in nbdkit-split-plugin(1) (AISLE AI security scanner).

Fix a memory leak and document a potential denial of service vulnerability (although working by design) in nbdkit-cow-filter(1) (AISLE AI security scanner).

Fix a memory leak in server option parsing (AISLE AI security scanner).

  Plugins
In nbdkit-file-plugin(1) we no longer advertize minimum_io_size larger than 64K even for backing storage like LVM that could support it. This is because the NBD protocol itself does not support larger sizes (thanks Nijin Ashok, Eric Blake, Mikulas Patocka).

In nbdkit-sparse-random-plugin(1) the block size is now configurable at run time.

In nbdkit-vddk-plugin(1) test against VDDK 9.0.1.0.

  Filters
New nbdkit-xor-filter(1) simply XORs a pattern or PRNG with the underlying data, providing simple obfuscation.

nbdkit-cow-filter(1) now supports arbitrarily large overlays, even when the filesystem used to store the overlay has file size limitations (eg. 16T on ext4)

nbdkit-ip-filter(1) now allows you to filter on loopback addresses.

  Language bindings
In nbdkit-ocaml-plugin(3) a new "NBDKit.Error" exception can be used to throw a precise errno with error message. Also "Unix_error" exception is now translated to errno and error, and there are other improvements to "Failure" and "Invalid_argument" exceptions.

In nbdkit-ocaml-plugin provide convenience functions for converting bytes and string types into "NBDKit.buf"

  Server
nbdkit --port=0 can be used to let the kernel pick a free listening port.

"LISTEN_FDNAMES" is now parsed for socket activation, although we do nothing aside from printing socket names.

  API
New nbdkit_debug_hexdiff(3) function which shows the differences between two binary buffers.

New nbdkit_name(3) function which returns the nbdkit --name parameter to plugins and filters.

New nbdkit_timestamp(3) function which returns a timestamp suitable for log messages.

When parsing human sizes (eg. in nbdkit_parse_size(3)), allow hex and octal sizes, and allow "_" before the scaling factor. For example "0x1_E" is parsed as 1 exabyte.

nbdkit_read_password(3) "password=-" now reads the password from /dev/tty on operating systems that support this.

  Documentation
Document how to disable shadow stack support for loading plugins that were not compiled with this feature.

  Tests
A new interoperability test with Digital Ocean's Go-NBD client library was added.

Fix CI (Daniel Berrangé).

  Build
Setting "NBDKIT_VALGRIND_MASSIF=1" will run nbdkit under valgrind massif (for memory profiling).

SEE ALSO
nbdkit(1).

AUTHORS
Authors of nbdkit 1.48:

Daniel P. Berrangé
Eric Blake
Christopher Byrne
Richard W.M. Jones
Alan Somers

COPYRIGHT
Copyright Red Hat

LICENSE
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