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Prevent name.c:670: REQUIRE((name1->attributes & 0x00000001) == (name2->attributes & 0x00000001)) failed

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resume_qmin did not handle special case of recursing query hit
unexpected DNS_R_CNAME result. Change result to SERVFAIL in case
of a zone loaded after the recursion started. That prevents crashing
later in query_setorder, where there is uninitialized foundname compared
with absolute order names.

https://gitlab.isc.org/isc-projects/bind9/-/issues/5357
Resolves: RHEL-30407
This commit is contained in:
Petr Mensik 2025-06-10 15:34:02 +02:00 committed by Petr Menšík
parent 469e799820
commit bf3c76e9c3
2 changed files with 52 additions and 1 deletions
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44
bind-9.21-resume-qmin-cname.patch Normal file
View File

@ -0,0 +1,44 @@
From dc97bfa842b9f0d59db075bdcade599f3767f1ba Mon Sep 17 00:00:00 2001
From: Petr Mensik <pemensik@redhat.com>
Date: Tue, 3 Jun 2025 21:00:58 +0200
Subject: [PATCH] Handle CNAME and DNAME in resume_min in a special way
When authoritative zone is loaded when query minimization query for the
same zone is already pending, it might receive unexpected result codes.
Normally DNS_R_CNAME would follow to query_cname after processing sent
events, but dns_view_findzonecut does not fill CNAME target into
event->foundevent. Usual lookup via query_lookup would always have that
filled.
Ideally we would restart the query with unmodified search name, if
unexpected change from recursing to local zone cut were detected. Until
dns_view_findzonecut is modified to export zone/cache source of the cut,
at least fail queries which went into unexpected state.
---
lib/dns/resolver.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/lib/dns/resolver.c b/lib/dns/resolver.c
index be1d735..ad0a1b8 100644
--- a/lib/dns/resolver.c
+++ b/lib/dns/resolver.c
@@ -4508,6 +4508,15 @@ resume_qmin(isc_task_t *task, isc_event_t *event) {
if (result == DNS_R_NXDOMAIN) {
result = DNS_R_SERVFAIL;
}
+ /*
+ * CNAME or DNAME means zone were added with that record
+ * after the start of query minimization queries. It means
+ * we do not have initialized correct hevent->foundname
+ * and have to fail.
+ */
+ if (result == DNS_R_CNAME || result == DNS_R_DNAME) {
+ result = DNS_R_SERVFAIL;
+ }
if (result != ISC_R_SUCCESS) {
fctx_done(fctx, result, __LINE__);
--
2.49.0

9
bind.spec
View File

@ -56,7 +56,7 @@ Summary: The Berkeley Internet Name Domain (BIND) DNS (Domain Name System) serv
Name: bind
License: MPLv2.0
Version: 9.16.23
Release: 28%{?dist}
Release: 29%{?dist}
Epoch: 32
Url: https://www.isc.org/downloads/bind/
#
@ -179,6 +179,10 @@ Patch214: bind-9.16-CVE-2024-1737-records-test2.patch
# https://gitlab.isc.org/isc-projects/bind9/-/commit/c6e6a7af8ac6b575dd3657b0f5cf4248d734c2b0
Patch215: bind-9.18-CVE-2024-11187-pre-test.patch
Patch216: bind-9.18-CVE-2024-11187.patch
# https://gitlab.isc.org/isc-projects/bind9/-/merge_requests/10562
# https://gitlab.isc.org/isc-projects/bind9/-/issues/5357
# downstream patch fixing bind-dyndb-ldap causing issue
Patch217: bind-9.21-resume-qmin-cname.patch
%{?systemd_ordering}
Requires: coreutils
@ -1223,6 +1227,9 @@ fi;
%endif
%changelog
* Tue Jun 10 2025 Petr Menšík <pemensik@redhat.com> - 32:9.18.23-29
- Prevent name.c:670 attributes assertion failed (RHEL-30407)
* Sat Feb 15 2025 Petr Menšík <pemensik@redhat.com> - 32:9.16.23-28
- Fix test backport changes