[PATCH] bind: fix for CVE-2014-8500

Sona Sarmadi
2014-12-29T09:10:40Z

[From upstream commit: 603a0e2637b35a2da820bc807f69bcf09c682dce]

[YOCTO #7098]

External References:
===================
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-8500

Signed-off-by: Sona Sarmadi <sona.sarmadi@enea.com>
---
.../bind/bind/bind9_9_5-CVE-2014-8500.patch | 990 +++++++++++++++++++++
meta/recipes-connectivity/bind/bind_9.9.5.bb | 1 +
2 files changed, 991 insertions(+)
create mode 100644 meta/recipes-connectivity/bind/bind/bind9_9_5-CVE-2014-8500.patch

diff --git a/meta/recipes-connectivity/bind/bind/bind9_9_5-CVE-2014-8500.patch b/meta/recipes-connectivity/bind/bind/bind9_9_5-CVE-2014-8500.patch
new file mode 100644
index 0000000..d5c4560
--- /dev/null
+++ b/meta/recipes-connectivity/bind/bind/bind9_9_5-CVE-2014-8500.patch
@@ -0,0 +1,990 @@
+From 603a0e2637b35a2da820bc807f69bcf09c682dce Mon Sep 17 00:00:00 2001
+From: Evan Hunt <each@isc.org>
+Date: Mon, 17 Nov 2014 23:49:07 -0800
+Subject: [PATCH] [v9_9] limit recursion depth and iterative queries
+
+4006. [security] A flaw in delegation handling could be exploited
+ to put named into an infinite loop. This has
+ been addressed by placing limits on the number
+ of levels of recursion named will allow (default 7),
+ and the number of iterative queries that it will
+ send (default 50) before terminating a recursive
+ query (CVE-2014-8500).
+
+ The recursion depth limit is configured via the
+ "max-recursion-depth" option. [RT #35780]
+
+Upstream status: backport
+
+Signed-off-by: Sona Sarmadi <sona.sarmadi@enea.com>
+---
+ bin/named/config.c | 3 +-
+ bin/named/include/named/query.h | 2 -
+ bin/named/query.c | 7 ++-
+ bin/named/server.c | 5 ++
+ bin/tests/system/many/clean.sh | 7 +++
+ bin/tests/system/many/ns1/named.conf | 33 +++++++++++++
+ bin/tests/system/many/ns2/named.conf | 30 ++++++++++++
+ bin/tests/system/many/ns3/named.conf | 32 +++++++++++++
+ bin/tests/system/many/ns4/named.conf | 30 ++++++++++++
+ bin/tests/system/many/ns5/hints.db | 2 +
+ bin/tests/system/many/ns5/named.conf | 29 ++++++++++++
+ bin/tests/system/many/setup.sh | 75 ++++++++++++++++++++++++++++++
+ bin/tests/system/many/tests.sh | 48 +++++++++++++++++++
+ doc/arm/Bv9ARM-book.xml | 12 +++++
+ lib/dns/adb.c | 58 ++++++++++++++++-------
+ lib/dns/include/dns/adb.h | 8 ++++
+ lib/dns/include/dns/resolver.h | 25 ++++++++++
+ lib/dns/resolver.c | 90 ++++++++++++++++++++++++++++++------
+ lib/isccfg/namedconf.c | 1 +
+ 20 files changed, 471 insertions(+), 37 deletions(-)
+ create mode 100644 bin/tests/system/many/clean.sh
+ create mode 100644 bin/tests/system/many/ns1/named.conf
+ create mode 100644 bin/tests/system/many/ns2/named.conf
+ create mode 100644 bin/tests/system/many/ns3/named.conf
+ create mode 100644 bin/tests/system/many/ns4/named.conf
+ create mode 100644 bin/tests/system/many/ns5/hints.db
+ create mode 100644 bin/tests/system/many/ns5/named.conf
+ create mode 100644 bin/tests/system/many/setup.sh
+ create mode 100644 bin/tests/system/many/tests.sh
+
+diff --git a/bin/named/config.c b/bin/named/config.c
+index 2782720..5ee8c4e 100644
+--- a/bin/named/config.c
++++ b/bin/named/config.c
+@@ -15,8 +15,6 @@
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+-/* $Id: config.c,v 1.123 2012/01/06 23:46:41 tbox Exp $ */
+-
+ /*! \file */
+
+ #include <config.h>
+@@ -160,6 +158,7 @@ options {\n\
+ dnssec-accept-expired no;\n\
+ clients-per-query 10;\n\
+ max-clients-per-query 100;\n\
++ max-recursion-depth 7;\n\
+ zero-no-soa-ttl-cache no;\n\
+ nsec3-test-zone no;\n\
+ allow-new-zones no;\n\
+diff --git a/bin/named/include/named/query.h b/bin/named/include/named/query.h
+index 3beabb8..b5e3900 100644
+--- a/bin/named/include/named/query.h
++++ b/bin/named/include/named/query.h
+@@ -15,8 +15,6 @@
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+-/* $Id: query.h,v 1.45 2011/01/13 04:59:24 tbox Exp $ */
+-
+ #ifndef NAMED_QUERY_H
+ #define NAMED_QUERY_H 1
+
+diff --git a/bin/named/query.c b/bin/named/query.c
+index 982f76d..47bfc6a 100644
+--- a/bin/named/query.c
++++ b/bin/named/query.c
+@@ -3877,12 +3877,11 @@ query_recurse(ns_client_t *client, dns_rdatatype_t qtype, dns_name_t *qname,
+ peeraddr = &client->peeraddr;
+ else
+ peeraddr = NULL;
+- result = dns_resolver_createfetch2(client->view->resolver,
++ result = dns_resolver_createfetch3(client->view->resolver,
+ qname, qtype, qdomain, nameservers,
+ NULL, peeraddr, client->message->id,
+- client->query.fetchoptions,
+- client->task,
+- query_resume, client,
++ client->query.fetchoptions, 0,
++ client->task, query_resume, client,
+ rdataset, sigrdataset,
+ &client->query.fetch);
+
+diff --git a/bin/named/server.c b/bin/named/server.c
+index ac015a4..0559977 100644
+--- a/bin/named/server.c
++++ b/bin/named/server.c
+@@ -3161,6 +3161,11 @@ configure_view(dns_view_t *view, cfg_obj_t *config, cfg_obj_t *vconfig,
+ cfg_obj_asuint32(obj),
+ max_clients_per_query);
+
++ obj = NULL;
++ result = ns_config_get(maps, "max-recursion-depth", &obj);
++ INSIST(result == ISC_R_SUCCESS);
++ dns_resolver_setmaxdepth(view->resolver, cfg_obj_asuint32(obj));
++
+ #ifdef ALLOW_FILTER_AAAA_ON_V4
+ obj = NULL;
+ result = ns_config_get(maps, "filter-aaaa-on-v4", &obj);
+diff --git a/bin/tests/system/many/clean.sh b/bin/tests/system/many/clean.sh
+new file mode 100644
+index 0000000..119b1f5
+--- /dev/null
++++ b/bin/tests/system/many/clean.sh
+@@ -0,0 +1,7 @@
++rm -f ns1/[1-9]*example.tld?.db
++rm -f ns2/[1-9]*example.tld?.db
++rm -f ns1/zones.conf
++rm -f ns2/zones.conf
++rm -f */root.db
++rm -f ns3/tld1.db
++rm -f ns4/tld2.db
+diff --git a/bin/tests/system/many/ns1/named.conf b/bin/tests/system/many/ns1/named.conf
+new file mode 100644
+index 0000000..abc9dca
+--- /dev/null
++++ b/bin/tests/system/many/ns1/named.conf
+@@ -0,0 +1,33 @@
++/*
++ * Copyright (C) 2014 Internet Systems Consortium, Inc. ("ISC")
++ *
++ * Permission to use, copy, modify, and/or distribute this software for any
++ * purpose with or without fee is hereby granted, provided that the above
++ * copyright notice and this permission notice appear in all copies.
++ *
++ * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
++ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
++ * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
++ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
++ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
++ * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
++ * PERFORMANCE OF THIS SOFTWARE.
++ */
++
++controls { /* empty */ };
++
++options {
++ query-source address 10.53.0.1;
++ notify-source 10.53.0.1;
++ transfer-source 10.53.0.1;
++ port 5300;
++ pid-file "named.pid";
++ listen-on { 10.53.0.1; };
++ listen-on-v6 { none; };
++ recursion no;
++};
++
++include "zones.conf";
++
++// zone "tld1" { type master; file "tld1.db"; };
++// zone "tld2" { type master; file "tld2.db"; };
+diff --git a/bin/tests/system/many/ns2/named.conf b/bin/tests/system/many/ns2/named.conf
+new file mode 100644
+index 0000000..16266e2
+--- /dev/null
++++ b/bin/tests/system/many/ns2/named.conf
+@@ -0,0 +1,30 @@
++/*
++ * Copyright (C) 2014 Internet Systems Consortium, Inc. ("ISC")
++ *
++ * Permission to use, copy, modify, and/or distribute this software for any
++ * purpose with or without fee is hereby granted, provided that the above
++ * copyright notice and this permission notice appear in all copies.
++ *
++ * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
++ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
++ * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
++ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
++ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
++ * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
++ * PERFORMANCE OF THIS SOFTWARE.
++ */
++
++controls { /* empty */ };
++
++options {
++ query-source address 10.53.0.2;
++ notify-source 10.53.0.2;
++ transfer-source 10.53.0.2;
++ port 5300;
++ pid-file "named.pid";
++ listen-on { 10.53.0.2; };
++ listen-on-v6 { none; };
++ recursion no;
++};
++
++include "zones.conf";
+diff --git a/bin/tests/system/many/ns3/named.conf b/bin/tests/system/many/ns3/named.conf
+new file mode 100644
+index 0000000..b950afe
+--- /dev/null
++++ b/bin/tests/system/many/ns3/named.conf
+@@ -0,0 +1,32 @@
++/*
++ * Copyright (C) 2014 Internet Systems Consortium, Inc. ("ISC")
++ *
++ * Permission to use, copy, modify, and/or distribute this software for any
++ * purpose with or without fee is hereby granted, provided that the above
++ * copyright notice and this permission notice appear in all copies.
++ *
++ * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
++ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
++ * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
++ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
++ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
++ * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
++ * PERFORMANCE OF THIS SOFTWARE.
++ */
++
++controls { /* empty */ };
++
++options {
++ query-source address 10.53.0.3;
++ notify-source 10.53.0.3;
++ transfer-source 10.53.0.3;
++ port 5300;
++ pid-file "named.pid";
++ listen-on { 10.53.0.3; };
++ listen-on-v6 { none; };
++ recursion no;
++};
++
++zone "." { type master; file "root.db"; };
++
++zone "tld1" { type master; file "tld1.db"; };
+diff --git a/bin/tests/system/many/ns4/named.conf b/bin/tests/system/many/ns4/named.conf
+new file mode 100644
+index 0000000..ca9aa6a
+--- /dev/null
++++ b/bin/tests/system/many/ns4/named.conf
+@@ -0,0 +1,30 @@
++/*
++ * Copyright (C) 2014 Internet Systems Consortium, Inc. ("ISC")
++ *
++ * Permission to use, copy, modify, and/or distribute this software for any
++ * purpose with or without fee is hereby granted, provided that the above
++ * copyright notice and this permission notice appear in all copies.
++ *
++ * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
++ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
++ * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
++ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
++ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
++ * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
++ * PERFORMANCE OF THIS SOFTWARE.
++ */
++
++controls { /* empty */ };
++
++options {
++ query-source address 10.53.0.4;
++ notify-source 10.53.0.4;
++ transfer-source 10.53.0.4;
++ port 5300;
++ pid-file "named.pid";
++ listen-on { 10.53.0.4; };
++ listen-on-v6 { none; };
++ recursion no;
++};
++
++zone "tld2" { type master; file "tld2.db"; };
+diff --git a/bin/tests/system/many/ns5/hints.db b/bin/tests/system/many/ns5/hints.db
+new file mode 100644
+index 0000000..c05809b
+--- /dev/null
++++ b/bin/tests/system/many/ns5/hints.db
+@@ -0,0 +1,2 @@
++. 60 in ns ns.nil.
++ns.nil. 60 in A 10.53.0.3
+diff --git a/bin/tests/system/many/ns5/named.conf b/bin/tests/system/many/ns5/named.conf
+new file mode 100644
+index 0000000..fce7d59
+--- /dev/null
++++ b/bin/tests/system/many/ns5/named.conf
+@@ -0,0 +1,29 @@
++/*
++ * Copyright (C) 2014 Internet Systems Consortium, Inc. ("ISC")
++ *
++ * Permission to use, copy, modify, and/or distribute this software for any
++ * purpose with or without fee is hereby granted, provided that the above
++ * copyright notice and this permission notice appear in all copies.
++ *
++ * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
++ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
++ * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
++ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
++ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
++ * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
++ * PERFORMANCE OF THIS SOFTWARE.
++ */
++
++controls { /* empty */ };
++
++options {
++ query-source address 10.53.0.5;
++ notify-source 10.53.0.5;
++ transfer-source 10.53.0.5;
++ port 5300;
++ pid-file "named.pid";
++ listen-on { 10.53.0.5; };
++ listen-on-v6 { none; };
++};
++
++zone "." { type hint; file "hints.db"; };
+diff --git a/bin/tests/system/many/setup.sh b/bin/tests/system/many/setup.sh
+new file mode 100644
+index 0000000..80695b5
+--- /dev/null
++++ b/bin/tests/system/many/setup.sh
+@@ -0,0 +1,75 @@
++i=1
++
++cat > ns3/root.db << EOF
++. 60 in soa ns.nil. hostmaster.ns.nil. 1 0 0 0 0
++. 60 in ns ns.nil.
++ns.nil. 60 in a 10.53.0.3
++tld1. 60 in ns ns.tld1.
++ns.tld1. 60 in a 10.53.0.3
++tld2. 60 in ns ns.tld2.
++ns.tld2. 60 in a 10.53.0.4
++EOF
++
++cat > ns3/tld1.db << EOF
++tld1. 60 in soa ns.tld1. hostmaster.ns.tld1. 1 0 0 0 0
++tld1. 60 in ns ns.tld1.
++ns.tld1. 60 in a 10.53.0.1
++EOF
++
++cat > ns4/tld2.db << EOF
++tld2. 60 in soa ns.tld2. hostmaster.ns.tld4. 1 0 0 0 0
++tld2. 60 in ns ns.tld2.
++ns.tld2. 60 in a 10.53.0.1
++EOF
++
++: > ns1/zones.conf
++: > ns2/zones.conf
++
++while [ $i -lt 1000 ]
++do
++j=`expr $i + 1`
++s=`expr $j % 2 + 1`
++n=`expr $i % 2 + 1`
++t=`expr $s + 2`
++
++# i=1 j=2 s=1 n=2
++# i=2 j=3 s=1 n=2
++# i=3 j=4 s=1 n=2
++
++cat > ns1/${i}example.tld${s}.db << EOF
++${i}example.tld${s}. 60 in soa ns.${j}example.tld${n}. hostmaster 1 0 0 0 0
++${i}example.tld${s}. 60 in ns ns.${j}example.tld${n}.
++ns.${i}example.tld${s}. 60 in a 10.53.0.1
++EOF
++
++cat >> ns1/zones.conf << EOF
++zone "${i}example.tld${s}" { type master; file "${i}example.tld${s}.db"; };
++EOF
++
++cat >> ns${t}/tld${s}.db << EOF
++${i}example.tld${s}. 60 in ns ns.${j}example.tld${n}.
++EOF
++
++i=$j
++
++done
++
++j=`expr $i + 1`
++s=`expr $j % 2 + 1`
++n=`expr $s % 2 + 1`
++t=`expr $s + 2`
++
++cat > ns1/${i}example.tld${s}.db << EOF
++${i}example.tld${s}. 60 in soa ns.${i}example.tld${s}. hostmaster 1 0 0 0 0
++${i}example.tld${s}. 60 in ns ns.${i}example.tld${s}.
++ns.${i}example.tld${s}. 60 in a 10.53.0.1
++EOF
++
++cat >> ns1/zones.conf << EOF
++zone "${i}example.tld${s}" { type master; file "${i}example.tld${s}.db"; };
++EOF
++
++cat >> ns${t}/tld${s}.db << EOF
++${i}example.tld${s}. 60 in ns ns.${i}example.tld${s}.
++ns.${i}example.tld${s}. 60 in a 10.53.0.1
++EOF
+diff --git a/bin/tests/system/many/tests.sh b/bin/tests/system/many/tests.sh
+new file mode 100644
+index 0000000..37964e2
+--- /dev/null
++++ b/bin/tests/system/many/tests.sh
+@@ -0,0 +1,48 @@
++#!/bin/sh
++#
++# Copyright (C) 2014 Internet Systems Consortium, Inc. ("ISC")
++#
++# Permission to use, copy, modify, and/or distribute this software for any
++# purpose with or without fee is hereby granted, provided that the above
++# copyright notice and this permission notice appear in all copies.
++#
++# THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
++# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
++# AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
++# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
++# LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
++# OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
++# PERFORMANCE OF THIS SOFTWARE.
++
++SYSTEMTESTTOP=..
++. $SYSTEMTESTTOP/conf.sh
++
++status=0
++n=0
++
++n=`expr $n + 1`
++echo "I: attempt lookup 1example.tld2 soa ($n)"
++ret=0
++$DIG +tcp 1example.tld1 soa @10.53.0.5 -p 5300 > dig.out.test$n
++grep "status: SERVFAIL" dig.out.test$n > /dev/null || ret=1
++if [ $ret != 0 ]; then echo "I:failed"; fi
++status=`expr $status + $ret`
++
++n=`expr $n + 1`
++echo "I: attempt lookup 992example.tld2 soa ($n)"
++ret=0
++$DIG +tcp 992example.tld2 soa @10.53.0.5 -p 5300 > dig.out.test$n
++grep "status: SERVFAIL" dig.out.test$n > /dev/null || ret=1
++if [ $ret != 0 ]; then echo "I:failed"; fi
++status=`expr $status + $ret`
++
++n=`expr $n + 1`
++echo "I: attempt lookup 993example.tld1 soa ($n)"
++ret=0
++$DIG +tcp 993example.tld1 soa @10.53.0.5 -p 5300 > dig.out.test$n
++grep "status: NOERROR" dig.out.test$n > /dev/null || ret=1
++if [ $ret != 0 ]; then echo "I:failed"; fi
++status=`expr $status + $ret`
++
++echo "I:exit status: $status"
++exit $status
+diff --git a/doc/arm/Bv9ARM-book.xml b/doc/arm/Bv9ARM-book.xml
+index 9f7bd38..fff4249 100644
+--- a/doc/arm/Bv9ARM-book.xml
++++ b/doc/arm/Bv9ARM-book.xml
+@@ -4861,6 +4861,7 @@ badresp:1,adberr:0,findfail:0,valfail:0]
+ <optional> max-acache-size <replaceable>size_spec</replaceable> ; </optional>
+ <optional> clients-per-query <replaceable>number</replaceable> ; </optional>
+ <optional> max-clients-per-query <replaceable>number</replaceable> ; </optional>
++ <optional> max-recursion-depth <replaceable>number</replaceable> ; </optional>
+ <optional> masterfile-format (<constant>text</constant>|<constant>raw</constant>) ; </optional>
+ <optional> empty-server <replaceable>name</replaceable> ; </optional>
+ <optional> empty-contact <replaceable>name</replaceable> ; </optional>
+@@ -8680,6 +8681,17 @@ avoid-v6-udp-ports { 40000; range 50000 60000; };
+
+ </varlistentry>
+
++ <varlistentry id="max-recursion-depth">
++ <term><command>max-recursion-depth</command></term>
++
++
++ Sets the maximum number of levels of recursion
++ permitted at any one time while resolving a name.
++ The default is 7.
++
++
++ </varlistentry>
++
+ <varlistentry>
+ <term><command>notify-delay</command></term>
+
+diff --git a/lib/dns/adb.c b/lib/dns/adb.c
+index 2ccb51e..fe9b3f7 100644
+--- a/lib/dns/adb.c
++++ b/lib/dns/adb.c
+@@ -199,6 +199,7 @@ struct dns_adbfetch {
+ unsigned int magic;
+ dns_fetch_t *fetch;
+ dns_rdataset_t rdataset;
++ unsigned int depth;
+ };
+
+ /*%
+@@ -300,7 +301,7 @@ static inline void violate_locking_hierarchy(isc_mutex_t *, isc_mutex_t *);
+ static isc_boolean_t clean_namehooks(dns_adb_t *, dns_adbnamehooklist_t *);
+ static void clean_target(dns_adb_t *, dns_name_t *);
+ static void clean_finds_at_name(dns_adbname_t *, isc_eventtype_t,
+- unsigned int);
++ isc_uint32_t, unsigned int);
+ static isc_boolean_t check_expire_namehooks(dns_adbname_t *, isc_stdtime_t);
+ static isc_boolean_t check_expire_entry(dns_adb_t *, dns_adbentry_t **,
+ isc_stdtime_t);
+@@ -308,7 +309,7 @@ static void cancel_fetches_at_name(dns_adbname_t *);
+ static isc_result_t dbfind_name(dns_adbname_t *, isc_stdtime_t,
+ dns_rdatatype_t);
+ static isc_result_t fetch_name(dns_adbname_t *, isc_boolean_t,
+- dns_rdatatype_t);
++ unsigned int, dns_rdatatype_t);
+ static inline void check_exit(dns_adb_t *);
+ static void destroy(dns_adb_t *);
+ static isc_boolean_t shutdown_names(dns_adb_t *);
+@@ -984,7 +985,7 @@ kill_name(dns_adbname_t **n, isc_eventtype_t ev) {
+ * Clean up the name's various lists. These two are destructive
+ * in that they will always empty the list.
+ */
+- clean_finds_at_name(name, ev, DNS_ADBFIND_ADDRESSMASK);
++ clean_finds_at_name(name, ev, 0, DNS_ADBFIND_ADDRESSMASK);
+ result4 = clean_namehooks(adb, &name->v4);
+ result6 = clean_namehooks(adb, &name->v6);
+ clean_target(adb, &name->target);
+@@ -1409,7 +1410,7 @@ event_free(isc_event_t *event) {
+ */
+ static void
+ clean_finds_at_name(dns_adbname_t *name, isc_eventtype_t evtype,
+- unsigned int addrs)
++ isc_uint32_t qtotal, unsigned int addrs)
+ {
+ isc_event_t *ev;
+ isc_task_t *task;
+@@ -1469,6 +1470,7 @@ clean_finds_at_name(dns_adbname_t *name, isc_eventtype_t evtype,
+ ev->ev_sender = find;
+ find->result_v4 = find_err_map[name->fetch_err];
+ find->result_v6 = find_err_map[name->fetch6_err];
++ find->qtotal += qtotal;
+ ev->ev_type = evtype;
+ ev->ev_destroy = event_free;
+ ev->ev_destroy_arg = find;
+@@ -1827,6 +1829,7 @@ new_adbfind(dns_adb_t *adb) {
+ h->flags = 0;
+ h->result_v4 = ISC_R_UNEXPECTED;
+ h->result_v6 = ISC_R_UNEXPECTED;
++ h->qtotal = 0;
+ ISC_LINK_INIT(h, publink);
+ ISC_LINK_INIT(h, plink);
+ ISC_LIST_INIT(h->list);
+@@ -2799,6 +2802,19 @@ dns_adb_createfind(dns_adb_t *adb, isc_task_t *task, isc_taskaction_t action,
+ isc_stdtime_t now, dns_name_t *target,
+ in_port_t port, dns_adbfind_t **findp)
+ {
++ return (dns_adb_createfind2(adb, task, action, arg, name,
++ qname, qtype, options, now,
++ target, port, 0, findp));
++}
++
++isc_result_t
++dns_adb_createfind2(dns_adb_t *adb, isc_task_t *task, isc_taskaction_t action,
++ void *arg, dns_name_t *name, dns_name_t *qname,
++ dns_rdatatype_t qtype, unsigned int options,
++ isc_stdtime_t now, dns_name_t *target,
++ in_port_t port, unsigned int depth,
++ dns_adbfind_t **findp)
++{
+ dns_adbfind_t *find;
+ dns_adbname_t *adbname;
+ int bucket;
+@@ -3029,7 +3045,7 @@ dns_adb_createfind(dns_adb_t *adb, isc_task_t *task, isc_taskaction_t action,
+ * Start V4.
+ */
+ if (WANT_INET(wanted_fetches) &&
+- fetch_name(adbname, start_at_zone,
++ fetch_name(adbname, start_at_zone, depth,
+ dns_rdatatype_a) == ISC_R_SUCCESS) {
+ DP(DEF_LEVEL,
+ "dns_adb_createfind: started A fetch for name %p",
+@@ -3040,7 +3056,7 @@ dns_adb_createfind(dns_adb_t *adb, isc_task_t *task, isc_taskaction_t action,
+ * Start V6.
+ */
+ if (WANT_INET6(wanted_fetches) &&
+- fetch_name(adbname, start_at_zone,
++ fetch_name(adbname, start_at_zone, depth,
+ dns_rdatatype_aaaa) == ISC_R_SUCCESS) {
+ DP(DEF_LEVEL,
+ "dns_adb_createfind: "
+@@ -3656,6 +3672,7 @@ fetch_callback(isc_task_t *task, isc_event_t *ev) {
+ isc_result_t result;
+ unsigned int address_type;
+ isc_boolean_t want_check_exit = ISC_FALSE;
++ isc_uint32_t qtotal = 0;
+
+ UNUSED(task);
+
+@@ -3666,6 +3683,8 @@ fetch_callback(isc_task_t *task, isc_event_t *ev) {
+ adb = name->adb;
+ INSIST(DNS_ADB_VALID(adb));
+
++ qtotal = dev->qtotal;
++
+ bucket = name->lock_bucket;
+ LOCK(&adb->namelocks[bucket]);
+
+@@ -3783,6 +3802,12 @@ fetch_callback(isc_task_t *task, isc_event_t *ev) {
+ DP(DEF_LEVEL, "adb: fetch of '%s' %s failed: %s",
+ buf, address_type == DNS_ADBFIND_INET ? "A" : "AAAA",
+ dns_result_totext(dev->result));
++ /*
++ * Don't record a failure unless this is the initial
++ * fetch of a chain.
++ */
++ if (fetch->depth > 1)
++ goto out;
+ /* XXXMLG Don't pound on bad servers. */
+ if (address_type == DNS_ADBFIND_INET) {
+ name->expire_v4 = ISC_MIN(name->expire_v4, now + 300);
+@@ -3814,15 +3839,14 @@ fetch_callback(isc_task_t *task, isc_event_t *ev) {
+ free_adbfetch(adb, &fetch);
+ isc_event_free(&ev);
+
+- clean_finds_at_name(name, ev_status, address_type);
++ clean_finds_at_name(name, ev_status, qtotal, address_type);
+
+ UNLOCK(&adb->namelocks[bucket]);
+ }
+
+ static isc_result_t
+-fetch_name(dns_adbname_t *adbname,
+- isc_boolean_t start_at_zone,
+- dns_rdatatype_t type)
++fetch_name(dns_adbname_t *adbname, isc_boolean_t start_at_zone,
++ unsigned int depth, dns_rdatatype_t type)
+ {
+ isc_result_t result;
+ dns_adbfetch_t *fetch = NULL;
+@@ -3867,12 +3891,14 @@ fetch_name(dns_adbname_t *adbname,
+ result = ISC_R_NOMEMORY;
+ goto cleanup;
+ }
+-
+- result = dns_resolver_createfetch(adb->view->resolver, &adbname->name,
+- type, name, nameservers, NULL,
+- options, adb->task, fetch_callback,
+- adbname, &fetch->rdataset, NULL,
+- &fetch->fetch);
++ fetch->depth = depth;
++
++ result = dns_resolver_createfetch3(adb->view->resolver, &adbname->name,
++ type, name, nameservers, NULL,
++ NULL, 0, options, depth, adb->task,
++ fetch_callback, adbname,
++ &fetch->rdataset, NULL,
++ &fetch->fetch);
+ if (result != ISC_R_SUCCESS)
+ goto cleanup;
+
+diff --git a/lib/dns/include/dns/adb.h b/lib/dns/include/dns/adb.h
+index 35350ff..7501f01 100644
+--- a/lib/dns/include/dns/adb.h
++++ b/lib/dns/include/dns/adb.h
+@@ -118,6 +118,8 @@ struct dns_adbfind {
+ isc_result_t result_v6; /*%< RO: v6 result */
+ ISC_LINK(dns_adbfind_t) publink; /*%< RW: client use */
+
++ isc_uint32_t qtotal;
++
+ /* Private */
+ isc_mutex_t lock; /* locks all below */
+ in_port_t port;
+@@ -334,6 +336,12 @@ dns_adb_createfind(dns_adb_t *adb, isc_task_t *task, isc_taskaction_t action,
+ dns_rdatatype_t qtype, unsigned int options,
+ isc_stdtime_t now, dns_name_t *target,
+ in_port_t port, dns_adbfind_t **find);
++isc_result_t
++dns_adb_createfind2(dns_adb_t *adb, isc_task_t *task, isc_taskaction_t action,
++ void *arg, dns_name_t *name, dns_name_t *qname,
++ dns_rdatatype_t qtype, unsigned int options,
++ isc_stdtime_t now, dns_name_t *target, in_port_t port,
++ unsigned int depth, dns_adbfind_t **find);
+ /*%<
+ * Main interface for clients. The adb will look up the name given in
+ * "name" and will build up a list of found addresses, and perhaps start
+diff --git a/lib/dns/include/dns/resolver.h b/lib/dns/include/dns/resolver.h
+index 4e20eb6..c256049 100644
+--- a/lib/dns/include/dns/resolver.h
++++ b/lib/dns/include/dns/resolver.h
+@@ -82,6 +82,7 @@ typedef struct dns_fetchevent {
+ isc_sockaddr_t * client;
+ dns_messageid_t id;
+ isc_result_t vresult;
++ isc_uint32_t qtotal;
+ } dns_fetchevent_t;
+
+ /*
+@@ -275,6 +276,18 @@ dns_resolver_createfetch2(dns_resolver_t *res, dns_name_t *name,
+ dns_rdataset_t *rdataset,
+ dns_rdataset_t *sigrdataset,
+ dns_fetch_t **fetchp);
++isc_result_t
++dns_resolver_createfetch3(dns_resolver_t *res, dns_name_t *name,
++ dns_rdatatype_t type,
++ dns_name_t *domain, dns_rdataset_t *nameservers,
++ dns_forwarders_t *forwarders,
++ isc_sockaddr_t *client, isc_uint16_t id,
++ unsigned int options, unsigned int depth,
++ isc_task_t *task,
++ isc_taskaction_t action, void *arg,
++ dns_rdataset_t *rdataset,
++ dns_rdataset_t *sigrdataset,
++ dns_fetch_t **fetchp);
+ /*%<
+ * Recurse to answer a question.
+ *
+@@ -576,6 +589,18 @@ dns_resolver_printbadcache(dns_resolver_t *resolver, FILE *fp);
+ * \li resolver to be valid.
+ */
+
++void
++dns_resolver_setmaxdepth(dns_resolver_t *resolver, unsigned int maxdepth);
++unsigned int
++dns_resolver_getmaxdepth(dns_resolver_t *resolver);
++/*%
++ * Get and set how many NS indirections will be followed when looking for
++ * nameserver addresses.
++ *
++ * Requires:
++ * \li resolver to be valid.
++ */
++
+ ISC_LANG_ENDDECLS
+
+ #endif /* DNS_RESOLVER_H */
+diff --git a/lib/dns/resolver.c b/lib/dns/resolver.c
+index e517dad..6a635b2 100644
+--- a/lib/dns/resolver.c
++++ b/lib/dns/resolver.c
+@@ -131,6 +131,16 @@
+ #define MAXIMUM_QUERY_TIMEOUT 30 /* The maximum time in seconds for the whole query to live. */
+ #endif
+
++/* The default maximum number of recursions to follow before giving up. */
++#ifndef DEFAULT_RECURSION_DEPTH
++#define DEFAULT_RECURSION_DEPTH 7
++#endif
++
++/* The default maximum number of iterative queries to allow before giving up. */
++#ifndef DEFAULT_MAX_QUERIES
++#define DEFAULT_MAX_QUERIES 50
++#endif
++
+ /*%
+ * Maximum EDNS0 input packet size.
+ */
+@@ -297,6 +307,7 @@ struct fetchctx {
+ isc_uint64_t duration;
+ isc_boolean_t logged;
+ unsigned int querysent;
++ unsigned int totalqueries;
+ unsigned int referrals;
+ unsigned int lamecount;
+ unsigned int neterr;
+@@ -307,6 +318,7 @@ struct fetchctx {
+ isc_boolean_t timeout;
+ dns_adbaddrinfo_t *addrinfo;
+ isc_sockaddr_t *client;
++ unsigned int depth;
+ };
+
+ #define FCTX_MAGIC ISC_MAGIC('F', '!', '!', '!')
+@@ -419,6 +431,7 @@ struct dns_resolver {
+ isc_timer_t * spillattimer;
+ isc_boolean_t zero_no_soa_ttl;
+ unsigned int query_timeout;
++ unsigned int maxdepth;
+
+ /* Locked by lock. */
+ unsigned int references;
+@@ -1097,6 +1110,7 @@ fctx_sendevents(fetchctx_t *fctx, isc_result_t result, int line) {
+ event->result == DNS_R_NCACHENXRRSET);
+ }
+
++ event->qtotal = fctx->totalqueries;
+ isc_task_sendanddetach(&task, ISC_EVENT_PTR(&event));
+ count++;
+ }
+@@ -1537,7 +1551,9 @@ fctx_query(fetchctx_t *fctx, dns_adbaddrinfo_t *addrinfo,
+ if (result != ISC_R_SUCCESS)
+ goto cleanup_dispatch;
+ }
++
+ fctx->querysent++;
++ fctx->totalqueries++;
+
+ ISC_LIST_APPEND(fctx->queries, query, link);
+ query->fctx->nqueries++;
+@@ -2194,9 +2210,10 @@ fctx_finddone(isc_task_t *task, isc_event_t *event) {
+ */
+ INSIST(!SHUTTINGDOWN(fctx));
+ fctx->attributes &= ~FCTX_ATTR_ADDRWAIT;
+- if (event->ev_type == DNS_EVENT_ADBMOREADDRESSES)
++ if (event->ev_type == DNS_EVENT_ADBMOREADDRESSES) {
+ want_try = ISC_TRUE;
+- else {
++ fctx->totalqueries += find->qtotal;
++ } else {
+ fctx->findfail++;
+ if (fctx->pending == 0) {
+ /*
+@@ -2479,12 +2496,13 @@ findname(fetchctx_t *fctx, dns_name_t *name, in_port_t port,
+ * See what we know about this address.
+ */
+ find = NULL;
+- result = dns_adb_createfind(fctx->adb,
+- res->buckets[fctx->bucketnum].task,
+- fctx_finddone, fctx, name,
+- &fctx->name, fctx->type,
+- options, now, NULL,
+- res->view->dstport, &find);
++ result = dns_adb_createfind2(fctx->adb,
++ res->buckets[fctx->bucketnum].task,
++ fctx_finddone, fctx, name,
++ &fctx->name, fctx->type,
++ options, now, NULL,
++ res->view->dstport,
++ fctx->depth + 1, &find);
+ if (result != ISC_R_SUCCESS) {
+ if (result == DNS_R_ALIAS) {
+ /*
+@@ -2592,6 +2610,11 @@ fctx_getaddresses(fetchctx_t *fctx, isc_boolean_t badcache) {
+
+ res = fctx->res;
+
++ if (fctx->depth > res->maxdepth) {
++ FCTXTRACE("too much NS indirection");
++ return (DNS_R_SERVFAIL);
++ }
++
+ /*
+ * Forwarders.
+ */
+@@ -3030,6 +3053,9 @@ fctx_try(fetchctx_t *fctx, isc_boolean_t retrying, isc_boolean_t badcache) {
+
+ REQUIRE(!ADDRWAIT(fctx));
+
++ if (fctx->totalqueries > DEFAULT_MAX_QUERIES)
++ fctx_done(fctx, DNS_R_SERVFAIL, __LINE__);
++
+ addrinfo = fctx_nextaddress(fctx);
+ if (addrinfo == NULL) {
+ /*
+@@ -3388,6 +3414,7 @@ fctx_start(isc_task_t *task, isc_event_t *event) {
+ * Normal fctx startup.
+ */
+ fctx->state = fetchstate_active;
++ fctx->totalqueries = 0;
+ /*
+ * Reset the control event for later use in shutting down
+ * the fctx.
+@@ -3457,6 +3484,7 @@ fctx_join(fetchctx_t *fctx, isc_task_t *task, isc_sockaddr_t *client,
+ event->fetch = fetch;
+ event->client = client;
+ event->id = id;
++ event->qtotal = 0;
+ dns_fixedname_init(&event->foundname);
+
+ /*
+@@ -3493,7 +3521,8 @@ log_ns_ttl(fetchctx_t *fctx, const char *where) {
+ static isc_result_t
+ fctx_create(dns_resolver_t *res, dns_name_t *name, dns_rdatatype_t type,
+ dns_name_t *domain, dns_rdataset_t *nameservers,
+- unsigned int options, unsigned int bucketnum, fetchctx_t **fctxp)
++ unsigned int options, unsigned int bucketnum, unsigned int depth,
++ fetchctx_t **fctxp)
+ {
+ fetchctx_t *fctx;
+ isc_result_t result;
+@@ -3545,6 +3574,7 @@ fctx_create(dns_resolver_t *res, dns_name_t *name, dns_rdatatype_t type,
+ fctx->state = fetchstate_init;
+ fctx->want_shutdown = ISC_FALSE;
+ fctx->cloned = ISC_FALSE;
++ fctx->depth = depth;
+ ISC_LIST_INIT(fctx->queries);
+ ISC_LIST_INIT(fctx->finds);
+ ISC_LIST_INIT(fctx->altfinds);
+@@ -3563,6 +3593,7 @@ fctx_create(dns_resolver_t *res, dns_name_t *name, dns_rdatatype_t type,
+ fctx->pending = 0;
+ fctx->restarts = 0;
+ fctx->querysent = 0;
++ fctx->totalqueries = 0;
+ fctx->referrals = 0;
+ TIME_NOW(&fctx->start);
+ fctx->timeouts = 0;
+@@ -7781,6 +7812,7 @@ dns_resolver_create(dns_view_t *view,
+ res->spillattimer = NULL;
+ res->zero_no_soa_ttl = ISC_FALSE;
+ res->query_timeout = DEFAULT_QUERY_TIMEOUT;
++ res->maxdepth = DEFAULT_RECURSION_DEPTH;
+ res->nbuckets = ntasks;
+ res->activebuckets = ntasks;
+ res->buckets = isc_mem_get(view->mctx,
+@@ -8219,9 +8251,9 @@ dns_resolver_createfetch(dns_resolver_t *res, dns_name_t *name,
+ dns_rdataset_t *sigrdataset,
+ dns_fetch_t **fetchp)
+ {
+- return (dns_resolver_createfetch2(res, name, type, domain,
++ return (dns_resolver_createfetch3(res, name, type, domain,
+ nameservers, forwarders, NULL, 0,
+- options, task, action, arg,
++ options, 0, task, action, arg,
+ rdataset, sigrdataset, fetchp));
+ }
+
+@@ -8237,6 +8269,25 @@ dns_resolver_createfetch2(dns_resolver_t *res, dns_name_t *name,
+ dns_rdataset_t *sigrdataset,
+ dns_fetch_t **fetchp)
+ {
++ return (dns_resolver_createfetch3(res, name, type, domain,
++ nameservers, forwarders, client, id,
++ options, 0, task, action, arg,
++ rdataset, sigrdataset, fetchp));
++}
++
++isc_result_t
++dns_resolver_createfetch3(dns_resolver_t *res, dns_name_t *name,
++ dns_rdatatype_t type,
++ dns_name_t *domain, dns_rdataset_t *nameservers,
++ dns_forwarders_t *forwarders,
++ isc_sockaddr_t *client, dns_messageid_t id,
++ unsigned int options, unsigned int depth,
++ isc_task_t *task,
++ isc_taskaction_t action, void *arg,
++ dns_rdataset_t *rdataset,
++ dns_rdataset_t *sigrdataset,
++ dns_fetch_t **fetchp)
++{
+ dns_fetch_t *fetch;
+ fetchctx_t *fctx = NULL;
+ isc_result_t result = ISC_R_SUCCESS;
+@@ -8325,11 +8376,12 @@ dns_resolver_createfetch2(dns_resolver_t *res, dns_name_t *name,
+
+ if (fctx == NULL) {
+ result = fctx_create(res, name, type, domain, nameservers,
+- options, bucketnum, &fctx);
++ options, bucketnum, depth, &fctx);
+ if (result != ISC_R_SUCCESS)
+ goto unlock;
+ new_fctx = ISC_TRUE;
+- }
++ } else if (fctx->depth > depth)
++ fctx->depth = depth;
+
+ result = fctx_join(fctx, task, client, id, action, arg,
+ rdataset, sigrdataset, fetch);
+@@ -9101,3 +9153,15 @@ dns_resolver_settimeout(dns_resolver_t *resolver, unsigned int seconds) {
+
+ resolver->query_timeout = seconds;
+ }
++
++void
++dns_resolver_setmaxdepth(dns_resolver_t *resolver, unsigned int maxdepth) {
++ REQUIRE(VALID_RESOLVER(resolver));
++ resolver->maxdepth = maxdepth;
++}
++
++unsigned int
++dns_resolver_getmaxdepth(dns_resolver_t *resolver) {
++ REQUIRE(VALID_RESOLVER(resolver));
++ return (resolver->maxdepth);
++}
+diff --git a/lib/isccfg/namedconf.c b/lib/isccfg/namedconf.c
+index bfd4bab..5f8b037 100644
+--- a/lib/isccfg/namedconf.c
++++ b/lib/isccfg/namedconf.c
+@@ -1393,6 +1393,7 @@ view_clauses[] = {
+ { "max-cache-ttl", &cfg_type_uint32, 0 },
+ { "max-clients-per-query", &cfg_type_uint32, 0 },
+ { "max-ncache-ttl", &cfg_type_uint32, 0 },
++ { "max-recursion-depth", &cfg_type_uint32, 0 },
+ { "max-udp-size", &cfg_type_uint32, 0 },
+ { "min-roots", &cfg_type_uint32, CFG_CLAUSEFLAG_NOTIMP },
+ { "minimal-responses", &cfg_type_boolean, 0 },
+--
+1.9.1
+
diff --git a/meta/recipes-connectivity/bind/bind_9.9.5.bb b/meta/recipes-connectivity/bind/bind_9.9.5.bb
index 635d277..8e04f8a 100644
--- a/meta/recipes-connectivity/bind/bind_9.9.5.bb
+++ b/meta/recipes-connectivity/bind/bind_9.9.5.bb
@@ -17,6 +17,7 @@ SRC_URI = "ftp://ftp.isc.org/isc/bind9/${PV}/${BPN}-${PV}.tar.gz \
file://named.service \
file://bind9 \
file://init.d-add-support-for-read-only-rootfs.patch \
+ file://bind9_9_5-CVE-2014-8500.patch \
"

SRC_URI[md5sum] = "e676c65cad5234617ee22f48e328c24e"
--
1.9.1