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Commit Author: Richard W_M_ Jones ( https://gitlab.com/rwmjones )
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7 months, 3 weeks
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ANNOUNCE: nbdkit 1.44.0
by Richard W.M. Jones
I'm pleased to announce the new stable release of nbdkit 1.44.
nbdkit is a Network Block Device (NBD) server with a stable plugin ABI
and a permissive license.
nbdkit 1.44.0 can be downloaded here:
https://download.libguestfs.org/nbdkit/1.44-stable/
git here: https://gitlab.com/nbdkit/nbdkit
Release notes for nbdkit 1.44 online:
https://libguestfs.org/nbdkit-release-notes-1.44.1.html
There's no Fedora package as currently the Fedora data center is
moving location. It's coming as soon as we can build one!
----
nbdkit 1.44.0 was released on 1 July 2025.
Security
Fix off-by-one for maximum block_status length (CVE-2025-47711), and a
32-bit overflow in extents handling (CVE-2025-47712) (reported by
Nikolay Ivanets and Eric Blake, and fixed by Eric Blake).
Thread-local storage is now used when printing certain protocol messages
in verbose mode, which avoids possible output corruption. Since these
messages were generated based on untrusted client input, the existing
code was examined to see if this could have been exploitable, but it is
not thought so. Nevertheless the fix was backported to stable version
1.42.2 and updating is recommended.
See nbdkit-security(1) for past security issues.
Plugins
New nbdkit-nfs-plugin(1) which allows access to disk images stored on
NFS servers (thanks Ronnie Sahlberg).
nbdkit-file-plugin(1) is now much more careful about checking for errors
from certain Linux system calls that we previously thought were just
advisory (thanks Eric Sandeen, Dave Chinner).
nbdkit-file-plugin(1) can now trim LVM thin block devices (thanks
Germano Veit Michel, Eric Blake).
nbdkit-curl-plugin(1) adds new "proxy-cafile" and "proxy-capath"
parameters (Adi Aloni).
nbdkit-vddk-plugin(1) adds a new "export" parameter which allows the
client to choose which file to serve via the NBD protocol export name.
This plugin has also been optimized so that querying extent information
no longer slows down reads. Debugging information has also be improved,
and we can now track the time taken to run asynchronous commands.
nbdkit-info-plugin(1) adds a new "mode=version" method.
nbdkit-torrent-plugin(1) now supports prefetching. This plugin now also
generates additional information in --dump-plugin output.
nbdkit-data-plugin(1) allows @offset to use scaling suffixes, eg. @4M to
move the offset to 4194304 (Eric Blake).
Filters
New nbdkit-openonce-filter(1) which can be used to open the underlying
plugin once, sharing the plugin across connections.
nbdkit-cacheextents-filter(1) has been deprecated, and is expected to be
removed in nbdkit 1.46.
nbdkit-cow-filter(1) now understands that the NBD protocol export name
causes multiple disk images to be exported, and correctly creates an
overlay per export. (See also "Documentation" below.)
nbdkit-ext2-filter(1) now permits concurrent client connections (Eric
Blake).
nbdkit-fua-filter(1) adds a new "flush-on-close=true" flag which can be
used to force a flush to persistent storage when the connection closes
even if the client does not request one.
nbdkit-blocksize-policy-filter(1) will now round unaligned extents from
plugins. Also adjust "blocksize-error-policy=error" to allow access to
the unaligned tail of the disk image, but at the same time add new
"blocksize-error-policy=strict-error" mode which can be used to block
that. (Eric Blake).
Language bindings
Plugins written in Golang now issue a warning if fork(2) is called,
since that will likely cause the plugin to break.
For the Rust plugin and Rust examples, clippy warnings are now only
enabled if the "./configure --enable-gcc-warnings" build option is used.
Server
New --log=/path option allowing error logging to be sent to a file.
Also new --log=default option which just directs logging to the default
output (the same as if --log is not used at all).
API
The filter API (which is not part of our API promise) changes the
".thread_model" call, allowing the current thread model to be changed
conditionally based on what the plugin sets it to.
Documentation
Filters which are "export-safe" — that is, they correctly handle the
case where plugins serve different content depending on the NBD protocol
export name — are now documented in "EXPORT-SAFE FILTERS" in
nbdkit-protocol(1).
A common macro is used for all references in the documentation to magic
parameters.
Tests
The particularly long-running "test-spinning-mkfs.sh" test has been
modified to finish more quickly.
Previously running the whole test suite would leave many
/tmp/nbdkitXXXXXX temporary directories behind. These have been reduced
although not quite eliminated.
New "define" function in tests/functions.sh which provides a simpler way
to add inline plugins and scripts to tests, reducing concerns around
quoting.
Several tests were modified to use the --run method to start the test
client. This improves performance and reduces fragility of the tests.
Tests now use "set -u" (error if an undefined variable is used) to
reduce a common cause of errors.
Build
The "./configure" output has been beautified, which also helps to
highlight problems when glancing at the output.
Fix build issues with GCC 15.
Allow User Statically Defined Tracing (USDT) probes to be added into the
server. Few actual probes are added so far, but the build system has
been modified to allow it.
nbdkit-vddk-plugin(1) drops support for VDDK 6.5, so the minimum
required version is now VDDK ≥ 6.7. Support for VDDK 9.0.0.0 has been
added.
Builds on clang were complaining about unused -pthread option. This
warning has been fixed (Eric Blake).
Internals
In Python code, remove unnecessary "global" statements (thanks Nir
Soffer).
nbdkit-file-plugin(1) now produces more detailed information in error
messages, particularly about the file being accessed and the offset and
size of the request that failed.
In debug mode, when the server starts up it prints a debug message
summarising the flow of request processing through filters and the
plugin, making this easier to understand.
AUTHORS
Authors of nbdkit 1.44:
Adi Aloni
Daniel P. Berrangé
Eric Blake
Richard W.M. Jones
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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8 months
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