Remove child delegations from cache when grandchild delegations are returned from parent #1053
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…legations up to parent to not cause delegation invalidation because of an expired child delegation that would never be updated. Most likely to happen without qname-minimisation. Reported by Roland van Rijswijk-Deij.
wcawijngaards
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The code looks good. The code removes the expired NS entries for multilabel delegations, from the intermediate labels, so that the ghost domain fixup does not trip on them as expired, but never removed, entries. This keeps the expired NS records in a way to detect that parental delegations need to be rechecked.
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gthess
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delegations are returned from parent.
jedisct1
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* nlnet/master: (45 commits) - Fix for NLnetLabs#1062: declaration before statement, avoid print of null, and redundant check for array size. And changelog note for merge of NLnetLabs#1062. Fix potential overflow bug while parsing port in function cfg_mark_ports - Set version number to 1.20.0 for release. - Fix for the DNSBomb vulnerability CVE-2024-33655. Thanks to Xiang Li from the Network and Information Security Lab of Tsinghua University for reporting it. - Fix doxygen comment for errinf_to_str_bogus. - Cleanup unnecessary strdup calls for EDE strings. - Man page entry for unbound-checkconf -q. - Fix NLnetLabs#876: [FR] can unbound-checkconf be silenced when configuration is valid? - Add unit tests for cachedb and subnet cache expired data. - Fix cachedb with serve-expired-client-timeout disabled. The edns subnet module deletes global cache and cachedb cache when it stores a result, and serve-expired is enabled, so that the global reply, that is older than the ecs reply, does not return after the ecs reply expires. - Fix doc unit test for out of directory build. - Fix to disable fragmentation on systems with IP_DONTFRAG, with a nonzero value for the socket option argument. Changelog note for NLnetLabs#1041 and NLnetLabs#1038. - Merge NLnetLabs#1041: Stub and Forward unshare. This has one structure for them and fixes NLnetLabs#1038: fatal error: Could not initialize thread / error: reading root hints. Update locking management for iter_fwd and iter_hints methods. (NLnetLabs#1054) - Fix configure flto check error, by finding grep for it. - Fix ci workflow for macos for moved install locations. - Merge NLnetLabs#1053: Remove child delegations from cache when grandchild delegations are returned from parent. - When a granchild delegation is returned, remove any cached child delegations up to parent to not cause delegation invalidation because of an expired child delegation that would never be updated. Most likely to happen without qname-minimisation. Reported by Roland van Rijswijk-Deij. - Fix edns subnet to sort rrset references when storing messages in the cache. This fixes a race condition in the rrset locks. - Add checklock feature verbose_locking to trace locks and unlocks. ...
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An expired delegation could cause delegation invalidation for its descendants.
When a parent replies with a grandchild delegation, an expired child delegation may never be updated and cause all sub queries to end up in the parent.
With this PR when a gandchild delegation response is returned, child delegations up to the parent are removed from the cache to try and avoid this.