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.
CVE-2021-3716 reset structured replies on starttls
nbdkit was vulnerable to injected plaintext when upgrading to a secure connection. For the full announcement see https://www.redhat.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).
nbdkit-data-plugin(1) has new
be<NN>: prefixes for little and big endian words. Also the plugin tries much harder to optimize expressions. The test suite has been greatly expanded to catch potential regressions.
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 effort to remove insecure algorithms (Daniel Berrangé).
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 performance.
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 similarly 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-close parameters to inject delays when clients connect and disconnect. Delay filter parameters are now parsed more accurately (thanks Ming Xie).
The OCaml bindings now call
caml_shutdown when unloading the plugin. This causes
Stdlib.at_exit handlers to run correctly, closes file descriptors, 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
References to Python 2 in nbdkit-python-plugin(3) have been removed.
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 enabled safely and with no performance impact even in production builds (Eric Blake).
Plugins or filters using
nbdkit_nanosleep now don't hang if the client closes the socket abruptly (thanks Ming Xie).
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
allocator=zstd no longer crashes when zeroing unallocated space.
Tests now use the new
GLIBC_TUNABLES feature, replacing
MALLOC_CHECK_ on glibc ≥ 2.34 (thanks Eric Blake, Siddhesh Poyarekar).
configure.ac now uses spaces consistently, and has been modernized to support the latest autotools (Eric Blake).
podwrapper.pl has been unified (almost) with the copy in libnbd.
Continue fuzzing using AFL++. Updated the fuzzing documentation.
Authors of nbdkit 1.28:
Daniel P. Berrangé
Richard W.M. Jones
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