nbdkit-release-notes-1.28(1) NBDKIT nbdkit-release-notes-1.28(1) NAME nbdkit-release-notes-1.28 - release notes for nbdkit 1.28 DESCRIPTION These are the release notes for nbdkit stable release 1.28. This describes the major changes since 1.26. nbdkit 1.28.0 was released on 23 September 2021. Security CVE-2021-3716 reset structured replies on starttls nbdkit was vulnerable to injected plaintext when upgrading to a secure con- nection. For the full announcement see https://www.red- hat.com/archives/libguestfs/2021-August/msg00083.html (Eric Blake). All past security issues and information about how to report new ones can be found in nbdkit-security(1). Plugins nbdkit-data-plugin(1) has new "le<NN>:" and "be<NN>:" prefixes for little and big endian words. Also the plugin tries much harder to optimize ex- pressions. The test suite has been greatly expanded to catch potential re- gressions. nbdkit-floppy-plugin(1) now allows you to reserve free space (Nolan Leake). nbdkit-ssh-plugin(1) no longer references SHA1 host keys as part of the ef- fort to remove insecure algorithms (Daniel BerrangA(C)). nbdkit-vddk-plugin(1) reports "can_flush" and "can_fua" based on what the version of VDDK supports. New debug flag -D vddk.stats=1 prints the amount of time spent in VDDK calls on exit which can be useful for profiling per- formance. Filters nbdkit-cow-filter(1) and nbdkit-cache-filter(1) no longer break up large read requests into page-sized requests. In addition the default block size for both filters is now 64K. Both changes greatly improve performance. nbdkit-cache-filter(1) has a new "cache-on-read=/PATH" parameter allowing callers to enable and disable the cache-on-read feature at runtime. Also there is a new "cache-min-block-size" parameter letting you select the block size at runtime (thanks Martin Kletzander). nbdkit-cow-filter(1) has a new "cow-on-read" parameter which works simi- larly to the corresponding cache filter feature. The new "cow-block-size" parameter lets you select the block size at runtime. nbdkit-cow-filter(1) has less verbose debugging. To restore the old debug output use -D cow.verbose=1 nbdkit-delay-filter(1) has new "delay-open" and "delay-close" parameters to inject delays when clients connect and disconnect. Delay filter parameters are now parsed more accurately (thanks Ming Xie). Language bindings The OCaml bindings now call "caml_shutdown" when unloading the plugin. This causes "Stdlib.at_exit" handlers to run correctly, closes file de- scriptors, releases dependent shared libraries and frees memory. Valgrind on OCaml plugins should not show any false positives about leaked memory. OCaml and Python bindings may now use the ".cleanup" method. References to Python 2 in nbdkit-python-plugin(3) have been removed. Server Fix captive nbdkit $uri variable so when TLS is used the URI is constructed with the "nbds:" prefix. Additionally add a new variable $tls which can be used by the subprocess to tell if TLS is enabled. Debug messages are now printed atomically. This means that debug messages are no longer broken up across multiple lines if there are other processes writing to stderr at the same time (which often happened when using captive nbdkit). Enhanced valgrind support (./configure --enable-valgrind) can now be en- abled safely and with no performance impact even in production builds (Eric Blake). API Plugins or filters using "nbdkit_nanosleep" now don't hang if the client closes the socket abruptly (thanks Ming Xie). Bug fixes nbdkit-data-plugin(1) and nbdkit-memory-plugin(1) using allocator=malloc no longer crash because of memory corruption in some corner cases (only seen on s390x, but could happen on other architectures). Meanwhile "alloca- tor=zstd" no longer crashes when zeroing unallocated space. Tests Tests now use the new "GLIBC_TUNABLES" feature, replacing "MALLOC_CHECK_" on glibc aY 2.34 (thanks Eric Blake, Siddhesh Poyarekar). Build configure.ac now uses spaces consistently, and has been modernized to sup- port the latest autotools (Eric Blake). podwrapper.pl has been unified (almost) with the copy in libnbd. Continue fuzzing using AFL++. Updated the fuzzing documentation. SEE ALSO nbdkit(1). AUTHORS Authors of nbdkit 1.28: Daniel P. BerrangA(C) Eric Blake Martin Kletzander Nolan Leake Richard W.M. Jones COPYRIGHT Copyright Red Hat LICENSE Redistribution and use in source and binary forms, with or without modifi- cation, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright no- tice, this list of conditions and the following disclaimer in the docu- mentation and/or other materials provided with the distribution. * Neither the name of Red Hat nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND ANY EX- PRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DIS- CLAIMED. IN NO EVENT SHALL RED HAT OR CONTRIBUTORS BE LIABLE FOR ANY DI- RECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SER- VICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABIL- ITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAM- AGE. nbdkit-1.46.2 2026-08-30 nbdkit-release-notes-1.28(1)
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