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bind9/doc/notes/notes-9.21.5.rst
Michał Kępień da23a0c4e1 Update CVE checklist
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Notes for BIND 9.21.5

New Features

  • Adds support for EDE code 1 and 2.

    Support was added for EDE codes 1 and 2, which might occur during DNSSEC validation in the case of an unsupported RRSIG algorithm or DNSKEY digest. #2715

  • Add an rndc command to toggle jemalloc profiling.

    The new command is rndc memprof; the memory profiling status is also reported inside rndc status. The status shows whether named can toggle memory profiling, and whether the server is built with jemalloc. #4759

  • Add support for multiple extended DNS errors.

    The Extended DNS Error (EDE) mechanism may raise errors during a DNS resolution. named is now able to add up to three EDE codes in a DNS response. If there are duplicate error codes, only the first one is part of the DNS response. #5085

  • Print the expiration time of stale records.

    BIND now prints the expiration time of any stale RRsets in the cache dump.

Feature Changes

  • Include destination address port number in query logging.

    When query logging is enabled, named now includes the destination address port in the logged message. #5060

Bug Fixes

  • Validate adb fetches.

    Previously, ADB responses were not validated, allowing spoofed responses to be accepted and used for further lookups. This should not be possible when the servers for the zone are in a signed zone, except with CD=1 requests or when glue is needed. This has been fixed. #5066

  • Recently expired records could be returned with a timestamp in future.

    Under rare circumstances, an RRSet that expired at the time of the query could be returned with a TTL in the future. This has been fixed.

    As a side effect, the expiration time of expired RRSets is no longer returned in a cache dump. #5094

  • YAML string not terminated in negative response in delv.

    #5098

  • Fix a bug in dnssec-signzone related to keys being offline.

    When dnssec-signzone was called on an already-signed zone and the private key file was unavailable, a signature that needed to be refreshed was dropped without being able to generate a replacement. This has been fixed. #5126

  • Apply the memory limit only to ADB database items.

    Under heavy load, a resolver could exhaust the memory available for storing the information in the Address Database (ADB), effectively discarding previously stored information in the ADB. The memory used to retrieve and provide information from the ADB is no longer subject to the same memory limits that are applied to the Address Database. #5127

  • Avoid unnecessary locking in the zone/cache database.

    Lock contention among many worker threads referring to the same database node at the same time is now prevented. This improves zone and cache database performance for any heavily contended database nodes. #5130

  • Fix reporting of Extended DNS Error 22 (No Reachable Authority).

    This error code was previously not reported in some applicable situations. This has been fixed. #5137