Resolve CVE-2024-1737
6400. [security] Excessively large rdatasets can slow down database query processing, so a limit has been placed on the number of records that can be stored per rdataset in a cache or zone database. This is configured with the new "max-records-per-type" option, and defaults to 100. (CVE-2024-1737) [GL #497] [GL #3405] 6401. [security] An excessively large number of rrtypes per owner can slow down database query processing, so a limit has been placed on the number of rrtypes that can be stored per owner (node) in a cache or zone database. This is configured with the new "max-rrtypes-per-name" option, and defaults to 100. (CVE-2024-1737) [GL #3403] [GL #4548] Does not change db methods like 9.18 fix. It makes limits set at build time and fixed numbers, but does not need adjusting db interface to set new limits. Resolves: RHEL-49900
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bind-9.16-CVE-2024-1737.patch
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bind-9.16-CVE-2024-1737.patch
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From c5357835c98b7b028f8a041b6976bb335c9a4056 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Ond=C5=99ej=20Sur=C3=BD?= <ondrej@isc.org>
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Date: Fri, 1 Mar 2024 08:26:07 +0100
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Subject: [PATCH] Add a limit to the number of RRs in RRSets
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Previously, the number of RRs in the RRSets were internally unlimited.
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As the data structure that holds the RRs is just a linked list, and
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there are places where we just walk through all of the RRs, adding an
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RRSet with huge number of RRs inside would slow down processing of said
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RRSets.
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The fix for end-of-life branches make the limit compile-time only for
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simplicity and the limit can be changed at the compile time by adding
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following define to CFLAGS:
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-DDNS_RDATASET_MAX_RECORDS=<limit>
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(cherry picked from commit c5c4d00c38530390c9e1ae4c98b65fbbadfe9e5e)
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(cherry picked from commit fdabf4b9570a60688f9f7d1e88d885f7a3718bca)
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Add a limit to the number of RR types for single name
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Previously, the number of RR types for a single owner name was limited
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only by the maximum number of the types (64k). As the data structure
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that holds the RR types for the database node is just a linked list, and
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there are places where we just walk through the whole list (again and
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again), adding a large number of RR types for a single owner named with
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would slow down processing of such name (database node).
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Add a hard-coded limit (100) to cap the number of the RR types for a single
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owner. The limit can be changed at the compile time by adding following
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define to CFLAGS:
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-DDNS_RBTDB_MAX_RTYPES=<limit>
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(cherry picked from commit dfcadc2085c8844b5836aff2b5ea51fb60c34868)
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Optimize the slabheader placement for certain RRTypes
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Mark the infrastructure RRTypes as "priority" types and place them at
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the beginning of the rdataslab header data graph. The non-priority
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types either go right after the priority types (if any).
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(cherry picked from commit 3ac482be7fd058d284e89873021339579fad0615)
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(cherry picked from commit 8ef414a7f38a04cfc11df44adaedaf3126fa3878)
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Expand the list of the priority types
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Add HTTPS, SVCB, SRV, PTR, NAPTR, DNSKEY and TXT records to the list of
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the priority types that are put at the beginning of the slabheader list
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for faster access and to avoid eviction when there are more types than
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the max-types-per-name limit.
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(cherry picked from commit b27c6bcce894786a8e082eafd59eccbf6f2731cb)
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(cherry picked from commit d56d2a32b861e81c2aaaabd309c4c58b629ede32)
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Make the resolver qtype ANY test order agnostic
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Instead of relying on a specific order of the RR types in the databases
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pick the first RR type as returned from the cache.
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(cherry picked from commit 58f660cf2b800963fa649bc9823a626009db3a7e)
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(cherry picked from commit c5ebda6deb0997dc520b26fa0639891459de5cb6)
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Be smarter about refusing to add many RR types to the database
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Instead of outright refusing to add new RR types to the cache, be a bit
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smarter:
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1. If the new header type is in our priority list, we always add either
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positive or negative entry at the beginning of the list.
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2. If the new header type is negative entry, and we are over the limit,
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we mark it as ancient immediately, so it gets evicted from the cache
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as soon as possible.
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3. Otherwise add the new header after the priority headers (or at the
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head of the list).
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4. If we are over the limit, evict the last entry on the normal header
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list.
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(cherry picked from commit 57cd34441a1b4ecc9874a4a106c2c95b8d7a3120)
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(cherry picked from commit 26c9da5f2857b72077c17e06ac79f068c63782cc)
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---
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bin/tests/system/resolver/tests.sh | 9 ++-
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configure | 2 +-
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configure.ac | 2 +-
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lib/dns/rbtdb.c | 125 ++++++++++++++++++++++++++++-
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lib/dns/rdataslab.c | 12 +++
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5 files changed, 144 insertions(+), 6 deletions(-)
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diff --git a/bin/tests/system/resolver/tests.sh b/bin/tests/system/resolver/tests.sh
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index 6c69c1104e..bd997a61a4 100755
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--- a/bin/tests/system/resolver/tests.sh
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+++ b/bin/tests/system/resolver/tests.sh
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@@ -553,15 +553,20 @@ n=`expr $n + 1`
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echo_i "check prefetch qtype * (${n})"
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ret=0
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$DIG $DIGOPTS @10.53.0.5 fetchall.tld any > dig.out.1.${n} || ret=1
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-ttl1=`awk '/"A" "short" "ttl"/ { print $2 - 3 }' dig.out.1.${n}`
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+ttl1=$(awk '/^fetchall.tld/ { print $2 - 3; exit }' dig.out.1.${n})
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# sleep so we are in prefetch range
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sleep ${ttl1:-0}
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# trigger prefetch
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$DIG $DIGOPTS @10.53.0.5 fetchall.tld any > dig.out.2.${n} || ret=1
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-ttl2=`awk '/"A" "short" "ttl"/ { print $2 }' dig.out.2.${n}`
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+ttl2=$(awk '/^fetchall.tld/ { print $2; exit }' dig.out.2.${n})
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sleep 1
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# check that the nameserver is still alive
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$DIG $DIGOPTS @10.53.0.5 fetchall.tld any > dig.out.3.${n} || ret=1
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+# note that only the first record is prefetched,
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+# because of the order of the records in the cache
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+$DIG $DIGOPTS @10.53.0.5 fetchall.tld any >dig.out.3.${n} || ret=1
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+ttl3=$(awk '/^fetchall.tld/ { print $2; exit }' dig.out.3.${n})
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+test "${ttl3:-0}" -gt "${ttl2:-1}" || ret=1
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if [ $ret != 0 ]; then echo_i "failed"; fi
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status=`expr $status + $ret`
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diff --git a/configure b/configure
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index ed2d4869e5..be0f60eaba 100755
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--- a/configure
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+++ b/configure
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@@ -12295,7 +12295,7 @@ fi
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XTARGETS=
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if test "$enable_developer" = "yes"; then :
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- STD_CDEFINES="$STD_CDEFINES -DISC_MEM_DEFAULTFILL=1 -DISC_LIST_CHECKINIT=1"
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+ STD_CDEFINES="$STD_CDEFINES -DISC_MEM_DEFAULTFILL=1 -DISC_LIST_CHECKINIT=1 -DDNS_RDATASET_MAX_RECORDS=5000 -DDNS_RBTDB_MAX_RTYPES=5000"
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test "${enable_fixed_rrset+set}" = set || enable_fixed_rrset=yes
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test "${enable_querytrace+set}" = set || enable_querytrace=yes
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test "${with_cmocka+set}" = set || with_cmocka=yes
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diff --git a/configure.ac b/configure.ac
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index 287de41369..3ff4bdd135 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -94,7 +94,7 @@ AC_ARG_ENABLE([developer],
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XTARGETS=
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AS_IF([test "$enable_developer" = "yes"],
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- [STD_CDEFINES="$STD_CDEFINES -DISC_MEM_DEFAULTFILL=1 -DISC_LIST_CHECKINIT=1"
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+ [STD_CDEFINES="$STD_CDEFINES -DISC_MEM_DEFAULTFILL=1 -DISC_LIST_CHECKINIT=1 -DDNS_RDATASET_MAX_RECORDS=5000 -DDNS_RBTDB_MAX_RTYPES=5000"
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test "${enable_fixed_rrset+set}" = set || enable_fixed_rrset=yes
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test "${enable_querytrace+set}" = set || enable_querytrace=yes
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test "${with_cmocka+set}" = set || with_cmocka=yes
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diff --git a/lib/dns/rbtdb.c b/lib/dns/rbtdb.c
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index 2707507bd7..e840c0665d 100644
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--- a/lib/dns/rbtdb.c
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+++ b/lib/dns/rbtdb.c
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@@ -967,6 +967,48 @@ set_ttl(dns_rbtdb_t *rbtdb, rdatasetheader_t *header, dns_ttl_t newttl) {
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}
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}
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+static bool
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+prio_type(rbtdb_rdatatype_t type) {
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+ switch (type) {
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+ case dns_rdatatype_soa:
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+ case RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, dns_rdatatype_soa):
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+ case dns_rdatatype_a:
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+ case RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, dns_rdatatype_a):
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+ case dns_rdatatype_mx:
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+ case RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, dns_rdatatype_mx):
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+ case dns_rdatatype_aaaa:
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+ case RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, dns_rdatatype_aaaa):
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+ case dns_rdatatype_nsec:
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+ case RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, dns_rdatatype_nsec):
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+ case dns_rdatatype_nsec3:
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+ case RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, dns_rdatatype_nsec3):
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+ case dns_rdatatype_ns:
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+ case RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, dns_rdatatype_ns):
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+ case dns_rdatatype_ds:
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+ case RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, dns_rdatatype_ds):
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+ case dns_rdatatype_cname:
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+ case RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, dns_rdatatype_cname):
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+ case dns_rdatatype_dname:
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+ case RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, dns_rdatatype_dname):
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+ case dns_rdatatype_svcb:
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+ case RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, dns_rdatatype_svcb):
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+ case dns_rdatatype_https:
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+ case RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, dns_rdatatype_https):
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+ case dns_rdatatype_dnskey:
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+ case RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, dns_rdatatype_dnskey):
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+ case dns_rdatatype_srv:
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+ case RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, dns_rdatatype_srv):
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+ case dns_rdatatype_txt:
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+ case RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, dns_rdatatype_txt):
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+ case dns_rdatatype_ptr:
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+ case RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, dns_rdatatype_ptr):
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+ case dns_rdatatype_naptr:
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+ case RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, dns_rdatatype_naptr):
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+ return (true);
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+ }
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+ return (false);
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+}
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+
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/*%
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* These functions allow the heap code to rank the priority of each
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* element. It returns true if v1 happens "sooner" than v2.
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@@ -6179,6 +6221,30 @@ update_recordsandxfrsize(bool add, rbtdb_version_t *rbtversion,
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RWUNLOCK(&rbtversion->rwlock, isc_rwlocktype_write);
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}
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+#ifndef DNS_RBTDB_MAX_RTYPES
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+#define DNS_RBTDB_MAX_RTYPES 100
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+#endif /* DNS_RBTDB_MAX_RTYPES */
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+
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+static bool
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+overmaxtype(dns_rbtdb_t *rbtdb, uint32_t ntypes) {
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+ UNUSED(rbtdb);
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+
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+ if (DNS_RBTDB_MAX_RTYPES == 0) {
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+ return (false);
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+ }
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+
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+ return (ntypes >= DNS_RBTDB_MAX_RTYPES);
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+}
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+
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+static bool
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+prio_header(rdatasetheader_t *header) {
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+ if (NEGATIVE(header) && prio_type(RBTDB_RDATATYPE_EXT(header->type))) {
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+ return (true);
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+ }
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+
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+ return (prio_type(header->type));
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+}
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+
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/*
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* write lock on rbtnode must be held.
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*/
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@@ -6190,6 +6256,7 @@ add32(dns_rbtdb_t *rbtdb, dns_rbtnode_t *rbtnode, const dns_name_t *nodename,
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rbtdb_changed_t *changed = NULL;
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rdatasetheader_t *topheader = NULL, *topheader_prev = NULL;
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rdatasetheader_t *header = NULL, *sigheader = NULL;
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+ rdatasetheader_t *prioheader = NULL, *expireheader = NULL;
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unsigned char *merged = NULL;
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isc_result_t result;
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bool header_nx;
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@@ -6199,6 +6266,7 @@ add32(dns_rbtdb_t *rbtdb, dns_rbtnode_t *rbtnode, const dns_name_t *nodename,
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rbtdb_rdatatype_t negtype, sigtype;
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dns_trust_t trust;
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int idx;
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+ uint32_t ntypes = 0;
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/*
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* Add an rdatasetheader_t to a node.
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@@ -6272,6 +6340,7 @@ add32(dns_rbtdb_t *rbtdb, dns_rbtnode_t *rbtnode, const dns_name_t *nodename,
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topheader = topheader->next) {
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if (topheader->type == sigtype) {
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sigheader = topheader;
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+ break;
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}
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}
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negtype = RBTDB_RDATATYPE_VALUE(covers, 0);
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@@ -6331,6 +6400,15 @@ add32(dns_rbtdb_t *rbtdb, dns_rbtnode_t *rbtnode, const dns_name_t *nodename,
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for (topheader = rbtnode->data; topheader != NULL;
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topheader = topheader->next) {
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+ if (IS_CACHE(rbtdb) && ACTIVE(topheader, now)) {
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+ ++ntypes;
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+ expireheader = topheader;
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+ } else if (!IS_CACHE(rbtdb)) {
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+ ++ntypes;
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+ }
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+ if (prio_header(topheader)) {
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+ prioheader = topheader;
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+ }
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if (topheader->type == newheader->type ||
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topheader->type == negtype) {
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break;
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@@ -6712,9 +6790,52 @@ find_header:
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/*
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* No rdatasets of the given type exist at the node.
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*/
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- newheader->next = rbtnode->data;
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+ if (!IS_CACHE(rbtdb) && overmaxtype(rbtdb, ntypes)) {
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+ free_rdataset(rbtdb, rbtdb->common.mctx,
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+ newheader);
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+ return (ISC_R_QUOTA);
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+ }
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+
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newheader->down = NULL;
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- rbtnode->data = newheader;
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+
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+ if (prio_header(newheader)) {
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+ /* This is a priority type, prepend it */
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+ newheader->next = rbtnode->data;
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+ rbtnode->data = newheader;
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+ } else if (prioheader != NULL) {
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+ /* Append after the priority headers */
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+ newheader->next = prioheader->next;
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+ prioheader->next = newheader;
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+ } else {
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+ /* There were no priority headers */
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+ newheader->next = rbtnode->data;
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+ rbtnode->data = newheader;
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+ }
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||||||
|
+
|
||||||
|
+ if (IS_CACHE(rbtdb) && overmaxtype(rbtdb, ntypes)) {
|
||||||
|
+ if (expireheader == NULL) {
|
||||||
|
+ expireheader = newheader;
|
||||||
|
+ }
|
||||||
|
+ if (NEGATIVE(newheader) &&
|
||||||
|
+ !prio_header(newheader))
|
||||||
|
+ {
|
||||||
|
+ /*
|
||||||
|
+ * Add the new non-priority negative
|
||||||
|
+ * header to the database only
|
||||||
|
+ * temporarily.
|
||||||
|
+ */
|
||||||
|
+ expireheader = newheader;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ set_ttl(rbtdb, expireheader, 0);
|
||||||
|
+ mark_header_ancient(rbtdb, expireheader);
|
||||||
|
+ /*
|
||||||
|
+ * FIXME: In theory, we should mark the RRSIG
|
||||||
|
+ * and the header at the same time, but there is
|
||||||
|
+ * no direct link between those two header, so
|
||||||
|
+ * we would have to check the whole list again.
|
||||||
|
+ */
|
||||||
|
+ }
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
diff --git a/lib/dns/rdataslab.c b/lib/dns/rdataslab.c
|
||||||
|
index 1d5e88f745..dda903819a 100644
|
||||||
|
--- a/lib/dns/rdataslab.c
|
||||||
|
+++ b/lib/dns/rdataslab.c
|
||||||
|
@@ -110,6 +110,10 @@ fillin_offsets(unsigned char *offsetbase, unsigned int *offsettable,
|
||||||
|
}
|
||||||
|
#endif /* if DNS_RDATASET_FIXED */
|
||||||
|
|
||||||
|
+#ifndef DNS_RDATASET_MAX_RECORDS
|
||||||
|
+#define DNS_RDATASET_MAX_RECORDS 100
|
||||||
|
+#endif /* DNS_RDATASET_MAX_RECORDS */
|
||||||
|
+
|
||||||
|
isc_result_t
|
||||||
|
dns_rdataslab_fromrdataset(dns_rdataset_t *rdataset, isc_mem_t *mctx,
|
||||||
|
isc_region_t *region, unsigned int reservelen) {
|
||||||
|
@@ -154,6 +158,10 @@ dns_rdataslab_fromrdataset(dns_rdataset_t *rdataset, isc_mem_t *mctx,
|
||||||
|
return (ISC_R_SUCCESS);
|
||||||
|
}
|
||||||
|
|
||||||
|
+ if (nitems > DNS_RDATASET_MAX_RECORDS) {
|
||||||
|
+ return (DNS_R_TOOMANYRECORDS);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
if (nitems > 0xffff) {
|
||||||
|
return (ISC_R_NOSPACE);
|
||||||
|
}
|
||||||
|
@@ -520,6 +528,10 @@ dns_rdataslab_merge(unsigned char *oslab, unsigned char *nslab,
|
||||||
|
#endif /* if DNS_RDATASET_FIXED */
|
||||||
|
INSIST(ocount > 0 && ncount > 0);
|
||||||
|
|
||||||
|
+ if (ocount + ncount > DNS_RDATASET_MAX_RECORDS) {
|
||||||
|
+ return (DNS_R_TOOMANYRECORDS);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
#if DNS_RDATASET_FIXED
|
||||||
|
oncount = ncount;
|
||||||
|
#endif /* if DNS_RDATASET_FIXED */
|
||||||
|
--
|
||||||
|
2.45.2
|
||||||
|
|
@ -153,7 +153,14 @@ Patch203: bind-9.16-isc_hp-CVE-2023-50387.patch
|
|||||||
# https://gitlab.isc.org/isc-projects/bind9/commit/1237d73cd1120b146ee699bbae7b2fe837cf2f98
|
# https://gitlab.isc.org/isc-projects/bind9/commit/1237d73cd1120b146ee699bbae7b2fe837cf2f98
|
||||||
Patch204: bind-9.16-CVE-2023-6516-test.patch
|
Patch204: bind-9.16-CVE-2023-6516-test.patch
|
||||||
Patch205: bind-9.16-isc_hp-additional.patch
|
Patch205: bind-9.16-isc_hp-additional.patch
|
||||||
|
# https://gitlab.isc.org/isc-projects/bind9/commit/26c9da5f2857b72077c17e06ac79f068c63782cc
|
||||||
|
# https://gitlab.isc.org/isc-projects/bind9/commit/c5ebda6deb0997dc520b26fa0639891459de5cb6
|
||||||
|
# https://gitlab.isc.org/isc-projects/bind9/commit/d56d2a32b861e81c2aaaabd309c4c58b629ede32
|
||||||
|
# https://gitlab.isc.org/isc-projects/bind9/commit/dfcadc2085c8844b5836aff2b5ea51fb60c34868
|
||||||
|
# https://gitlab.isc.org/isc-projects/bind9/commit/fdabf4b9570a60688f9f7d1e88d885f7a3718bca
|
||||||
|
# https://gitlab.isc.org/isc-projects/bind9/commit/8ef414a7f38a04cfc11df44adaedaf3126fa3878
|
||||||
Patch206: bind-9.16-CVE-2024-1975.patch
|
Patch206: bind-9.16-CVE-2024-1975.patch
|
||||||
|
Patch207: bind-9.16-CVE-2024-1737.patch
|
||||||
|
|
||||||
%{?systemd_ordering}
|
%{?systemd_ordering}
|
||||||
Requires: coreutils
|
Requires: coreutils
|
||||||
@ -492,6 +499,7 @@ in HTML and PDF format.
|
|||||||
%patch204 -p1 -b .CVE-2023-6516-test
|
%patch204 -p1 -b .CVE-2023-6516-test
|
||||||
%patch205 -p1 -b .RHEL-39131
|
%patch205 -p1 -b .RHEL-39131
|
||||||
%patch206 -p1 -b .CVE-2024-1975
|
%patch206 -p1 -b .CVE-2024-1975
|
||||||
|
%patch207 -p1 -b .CVE-2024-1737
|
||||||
|
|
||||||
%if %{with PKCS11}
|
%if %{with PKCS11}
|
||||||
%patch135 -p1 -b .config-pkcs11
|
%patch135 -p1 -b .config-pkcs11
|
||||||
@ -1222,6 +1230,7 @@ fi;
|
|||||||
%changelog
|
%changelog
|
||||||
* Thu Jul 18 2024 Petr Menšík <pemensik@redhat.com> - 32:9.16.23-22
|
* Thu Jul 18 2024 Petr Menšík <pemensik@redhat.com> - 32:9.16.23-22
|
||||||
- Resolve CVE-2024-1975
|
- Resolve CVE-2024-1975
|
||||||
|
- Resolve CVE-2024-1737
|
||||||
|
|
||||||
* Tue Jul 09 2024 Petr Menšík <pemensik@redhat.com> - 32:9.16.23-21
|
* Tue Jul 09 2024 Petr Menšík <pemensik@redhat.com> - 32:9.16.23-21
|
||||||
- Increase size of hazard pointer array (RHEL-39131)
|
- Increase size of hazard pointer array (RHEL-39131)
|
||||||
|
Loading…
Reference in New Issue
Block a user