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authorKai Kang <kai.kang@windriver.com>2019-11-22 10:04:26 +0800
committerRichard Purdie <richard.purdie@linuxfoundation.org>2020-01-16 22:38:52 +0000
commit56fc8c117dde2d7b6b68e617f682901526adc4ef (patch)
treeded6fe56af5c13202320a858486bc3982446ec31 /meta
parent023ff85a9ae94331926e923b346fd8a349881e63 (diff)
downloadpoky-56fc8c117dde2d7b6b68e617f682901526adc4ef.tar.gz
bind: fix CVE-2019-6471 and CVE-2018-5743
Backport patches to fix CVE-2019-6471 and CVE-2018-5743 for bind. CVE-2019-6471 is fixed by 0001-bind-fix-CVE-2019-6471.patch and the other 6 patches are for CVE-2018-5743. And backport one more patch to fix compile error on arm caused by these 6 commits. (From OE-Core rev: 3c39d4158677b97253df63f23b74c3a9dd5539f6) (From OE-Core rev: 230a96ddecf940a7caee9e9268b21aa5f65a7f14) Signed-off-by: Kai Kang <kai.kang@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org> Signed-off-by: Anuj Mittal <anuj.mittal@intel.com> Signed-off-by: Armin Kuster <akuster808@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Diffstat (limited to 'meta')
-rw-r--r--meta/recipes-connectivity/bind/bind/0001-bind-fix-CVE-2019-6471.patch64
-rw-r--r--meta/recipes-connectivity/bind/bind/0001-fix-enforcement-of-tcp-clients-v1.patch60
-rw-r--r--meta/recipes-connectivity/bind/bind/0002-tcp-clients-could-still-be-exceeded-v2.patch670
-rw-r--r--meta/recipes-connectivity/bind/bind/0003-use-reference-counter-for-pipeline-groups-v3.patch278
-rw-r--r--meta/recipes-connectivity/bind/bind/0004-better-tcpquota-accounting-and-client-mortality-chec.patch512
-rw-r--r--meta/recipes-connectivity/bind/bind/0005-refactor-tcpquota-and-pipeline-refs-allow-special-ca.patch911
-rw-r--r--meta/recipes-connectivity/bind/bind/0006-restore-allowance-for-tcp-clients-interfaces.patch80
-rw-r--r--meta/recipes-connectivity/bind/bind/0007-Replace-atomic-operations-in-bin-named-client.c-with.patch140
-rw-r--r--meta/recipes-connectivity/bind/bind_9.11.5-P4.bb8
9 files changed, 2723 insertions, 0 deletions
diff --git a/meta/recipes-connectivity/bind/bind/0001-bind-fix-CVE-2019-6471.patch b/meta/recipes-connectivity/bind/bind/0001-bind-fix-CVE-2019-6471.patch
new file mode 100644
index 0000000000..2fed99e1bb
--- /dev/null
+++ b/meta/recipes-connectivity/bind/bind/0001-bind-fix-CVE-2019-6471.patch
@@ -0,0 +1,64 @@
1Backport patch to fix CVE-2019-6471.
2
3Ref:
4https://security-tracker.debian.org/tracker/CVE-2019-6471
5
6CVE: CVE-2019-6471
7Upstream-Status: Backport [https://gitlab.isc.org/isc-projects/bind9/commit/3a9c7bb]
8
9Signed-off-by: Kai Kang <kai.kang@windriver.com>
10
11From 3a9c7bb80d4a609b86427406d9dd783199920b5b Mon Sep 17 00:00:00 2001
12From: Mark Andrews <marka@isc.org>
13Date: Tue, 19 Mar 2019 14:14:21 +1100
14Subject: [PATCH] move item_out test inside lock in dns_dispatch_getnext()
15
16(cherry picked from commit 60c42f849d520564ed42e5ed0ba46b4b69c07712)
17---
18 lib/dns/dispatch.c | 12 ++++++++----
19 1 file changed, 8 insertions(+), 4 deletions(-)
20
21diff --git a/lib/dns/dispatch.c b/lib/dns/dispatch.c
22index 408beda367..3278db4a07 100644
23--- a/lib/dns/dispatch.c
24+++ b/lib/dns/dispatch.c
25@@ -134,7 +134,7 @@ struct dns_dispentry {
26 isc_task_t *task;
27 isc_taskaction_t action;
28 void *arg;
29- bool item_out;
30+ bool item_out;
31 dispsocket_t *dispsocket;
32 ISC_LIST(dns_dispatchevent_t) items;
33 ISC_LINK(dns_dispentry_t) link;
34@@ -3422,13 +3422,14 @@ dns_dispatch_getnext(dns_dispentry_t *resp, dns_dispatchevent_t **sockevent) {
35 disp = resp->disp;
36 REQUIRE(VALID_DISPATCH(disp));
37
38- REQUIRE(resp->item_out == true);
39- resp->item_out = false;
40-
41 ev = *sockevent;
42 *sockevent = NULL;
43
44 LOCK(&disp->lock);
45+
46+ REQUIRE(resp->item_out == true);
47+ resp->item_out = false;
48+
49 if (ev->buffer.base != NULL)
50 free_buffer(disp, ev->buffer.base, ev->buffer.length);
51 free_devent(disp, ev);
52@@ -3573,6 +3574,9 @@ dns_dispatch_removeresponse(dns_dispentry_t **resp,
53 isc_task_send(disp->task[0], &disp->ctlevent);
54 }
55
56+/*
57+ * disp must be locked.
58+ */
59 static void
60 do_cancel(dns_dispatch_t *disp) {
61 dns_dispatchevent_t *ev;
62--
632.20.1
64
diff --git a/meta/recipes-connectivity/bind/bind/0001-fix-enforcement-of-tcp-clients-v1.patch b/meta/recipes-connectivity/bind/bind/0001-fix-enforcement-of-tcp-clients-v1.patch
new file mode 100644
index 0000000000..48ae125f84
--- /dev/null
+++ b/meta/recipes-connectivity/bind/bind/0001-fix-enforcement-of-tcp-clients-v1.patch
@@ -0,0 +1,60 @@
1Backport patch to fix CVE-2018-5743.
2
3Ref:
4https://security-tracker.debian.org/tracker/CVE-2018-5743
5
6CVE: CVE-2018-5743
7Upstream-Status: Backport [https://gitlab.isc.org/isc-projects/bind9/commit/ec2d50d]
8
9Signed-off-by: Kai Kang <kai.kang@windriver.com>
10
11From ec2d50da8d81814640e28593d912f4b96c7efece Mon Sep 17 00:00:00 2001
12From: =?UTF-8?q?Witold=20Kr=C4=99cicki?= <wpk@isc.org>
13Date: Thu, 3 Jan 2019 14:17:43 +0100
14Subject: [PATCH 1/6] fix enforcement of tcp-clients (v1)
15
16tcp-clients settings could be exceeded in some cases by
17creating more and more active TCP clients that are over
18the set quota limit, which in the end could lead to a
19DoS attack by e.g. exhaustion of file descriptors.
20
21If TCP client we're closing went over the quota (so it's
22not attached to a quota) mark it as mortal - so that it
23will be destroyed and not set up to listen for new
24connections - unless it's the last client for a specific
25interface.
26
27(cherry picked from commit f97131d21b97381cef72b971b157345c1f9b4115)
28(cherry picked from commit 9689ffc485df8f971f0ad81ab8ab1f5389493776)
29---
30 bin/named/client.c | 13 ++++++++++++-
31 1 file changed, 12 insertions(+), 1 deletion(-)
32
33diff --git a/bin/named/client.c b/bin/named/client.c
34index d482da7121..0739dd48af 100644
35--- a/bin/named/client.c
36+++ b/bin/named/client.c
37@@ -421,8 +421,19 @@ exit_check(ns_client_t *client) {
38 isc_socket_detach(&client->tcpsocket);
39 }
40
41- if (client->tcpquota != NULL)
42+ if (client->tcpquota != NULL) {
43 isc_quota_detach(&client->tcpquota);
44+ } else {
45+ /*
46+ * We went over quota with this client, we don't
47+ * want to restart listening unless this is the
48+ * last client on this interface, which is
49+ * checked later.
50+ */
51+ if (TCP_CLIENT(client)) {
52+ client->mortal = true;
53+ }
54+ }
55
56 if (client->timerset) {
57 (void)isc_timer_reset(client->timer,
58--
592.20.1
60
diff --git a/meta/recipes-connectivity/bind/bind/0002-tcp-clients-could-still-be-exceeded-v2.patch b/meta/recipes-connectivity/bind/bind/0002-tcp-clients-could-still-be-exceeded-v2.patch
new file mode 100644
index 0000000000..ca4e8b1a66
--- /dev/null
+++ b/meta/recipes-connectivity/bind/bind/0002-tcp-clients-could-still-be-exceeded-v2.patch
@@ -0,0 +1,670 @@
1Backport patch to fix CVE-2018-5743.
2
3Ref:
4https://security-tracker.debian.org/tracker/CVE-2018-5743
5
6CVE: CVE-2018-5743
7Upstream-Status: Backport [https://gitlab.isc.org/isc-projects/bind9/commit/719f604]
8
9Signed-off-by: Kai Kang <kai.kang@windriver.com>
10
11From 719f604e3fad5b7479bd14e2fa0ef4413f0a8fdc Mon Sep 17 00:00:00 2001
12From: =?UTF-8?q?Witold=20Kr=C4=99cicki?= <wpk@isc.org>
13Date: Fri, 4 Jan 2019 12:50:51 +0100
14Subject: [PATCH 2/6] tcp-clients could still be exceeded (v2)
15
16the TCP client quota could still be ineffective under some
17circumstances. this change:
18
19- improves quota accounting to ensure that TCP clients are
20 properly limited, while still guaranteeing that at least one client
21 is always available to serve TCP connections on each interface.
22- uses more descriptive names and removes one (ntcptarget) that
23 was no longer needed
24- adds comments
25
26(cherry picked from commit 924651f1d5e605cd186d03f4f7340bcc54d77cc2)
27(cherry picked from commit 55a7a458e30e47874d34bdf1079eb863a0512396)
28---
29 bin/named/client.c | 311 ++++++++++++++++++++-----
30 bin/named/include/named/client.h | 14 +-
31 bin/named/include/named/interfacemgr.h | 11 +-
32 bin/named/interfacemgr.c | 8 +-
33 4 files changed, 267 insertions(+), 77 deletions(-)
34
35diff --git a/bin/named/client.c b/bin/named/client.c
36index 0739dd48af..a7b49a0f71 100644
37--- a/bin/named/client.c
38+++ b/bin/named/client.c
39@@ -246,10 +246,11 @@ static void ns_client_dumpmessage(ns_client_t *client, const char *reason);
40 static isc_result_t get_client(ns_clientmgr_t *manager, ns_interface_t *ifp,
41 dns_dispatch_t *disp, bool tcp);
42 static isc_result_t get_worker(ns_clientmgr_t *manager, ns_interface_t *ifp,
43- isc_socket_t *sock);
44+ isc_socket_t *sock, ns_client_t *oldclient);
45 static inline bool
46-allowed(isc_netaddr_t *addr, dns_name_t *signer, isc_netaddr_t *ecs_addr,
47- uint8_t ecs_addrlen, uint8_t *ecs_scope, dns_acl_t *acl);
48+allowed(isc_netaddr_t *addr, dns_name_t *signer,
49+ isc_netaddr_t *ecs_addr, uint8_t ecs_addrlen,
50+ uint8_t *ecs_scope, dns_acl_t *acl)
51 static void compute_cookie(ns_client_t *client, uint32_t when,
52 uint32_t nonce, const unsigned char *secret,
53 isc_buffer_t *buf);
54@@ -405,8 +406,11 @@ exit_check(ns_client_t *client) {
55 */
56 INSIST(client->recursionquota == NULL);
57 INSIST(client->newstate <= NS_CLIENTSTATE_READY);
58- if (client->nreads > 0)
59+
60+ if (client->nreads > 0) {
61 dns_tcpmsg_cancelread(&client->tcpmsg);
62+ }
63+
64 if (client->nreads != 0) {
65 /* Still waiting for read cancel completion. */
66 return (true);
67@@ -416,25 +420,58 @@ exit_check(ns_client_t *client) {
68 dns_tcpmsg_invalidate(&client->tcpmsg);
69 client->tcpmsg_valid = false;
70 }
71+
72 if (client->tcpsocket != NULL) {
73 CTRACE("closetcp");
74 isc_socket_detach(&client->tcpsocket);
75+
76+ if (client->tcpactive) {
77+ LOCK(&client->interface->lock);
78+ INSIST(client->interface->ntcpactive > 0);
79+ client->interface->ntcpactive--;
80+ UNLOCK(&client->interface->lock);
81+ client->tcpactive = false;
82+ }
83 }
84
85 if (client->tcpquota != NULL) {
86- isc_quota_detach(&client->tcpquota);
87- } else {
88 /*
89- * We went over quota with this client, we don't
90- * want to restart listening unless this is the
91- * last client on this interface, which is
92- * checked later.
93+ * If we are not in a pipeline group, or
94+ * we are the last client in the group, detach from
95+ * tcpquota; otherwise, transfer the quota to
96+ * another client in the same group.
97 */
98- if (TCP_CLIENT(client)) {
99- client->mortal = true;
100+ if (!ISC_LINK_LINKED(client, glink) ||
101+ (client->glink.next == NULL &&
102+ client->glink.prev == NULL))
103+ {
104+ isc_quota_detach(&client->tcpquota);
105+ } else if (client->glink.next != NULL) {
106+ INSIST(client->glink.next->tcpquota == NULL);
107+ client->glink.next->tcpquota = client->tcpquota;
108+ client->tcpquota = NULL;
109+ } else {
110+ INSIST(client->glink.prev->tcpquota == NULL);
111+ client->glink.prev->tcpquota = client->tcpquota;
112+ client->tcpquota = NULL;
113 }
114 }
115
116+ /*
117+ * Unlink from pipeline group.
118+ */
119+ if (ISC_LINK_LINKED(client, glink)) {
120+ if (client->glink.next != NULL) {
121+ client->glink.next->glink.prev =
122+ client->glink.prev;
123+ }
124+ if (client->glink.prev != NULL) {
125+ client->glink.prev->glink.next =
126+ client->glink.next;
127+ }
128+ ISC_LINK_INIT(client, glink);
129+ }
130+
131 if (client->timerset) {
132 (void)isc_timer_reset(client->timer,
133 isc_timertype_inactive,
134@@ -455,15 +492,16 @@ exit_check(ns_client_t *client) {
135 * that already. Check whether this client needs to remain
136 * active and force it to go inactive if not.
137 *
138- * UDP clients go inactive at this point, but TCP clients
139- * may remain active if we have fewer active TCP client
140- * objects than desired due to an earlier quota exhaustion.
141+ * UDP clients go inactive at this point, but a TCP client
142+ * will needs to remain active if no other clients are
143+ * listening for TCP requests on this interface, to
144+ * prevent this interface from going nonresponsive.
145 */
146 if (client->mortal && TCP_CLIENT(client) && !ns_g_clienttest) {
147 LOCK(&client->interface->lock);
148- if (client->interface->ntcpcurrent <
149- client->interface->ntcptarget)
150+ if (client->interface->ntcpaccepting == 0) {
151 client->mortal = false;
152+ }
153 UNLOCK(&client->interface->lock);
154 }
155
156@@ -472,15 +510,17 @@ exit_check(ns_client_t *client) {
157 * queue for recycling.
158 */
159 if (client->mortal) {
160- if (client->newstate > NS_CLIENTSTATE_INACTIVE)
161+ if (client->newstate > NS_CLIENTSTATE_INACTIVE) {
162 client->newstate = NS_CLIENTSTATE_INACTIVE;
163+ }
164 }
165
166 if (NS_CLIENTSTATE_READY == client->newstate) {
167 if (TCP_CLIENT(client)) {
168 client_accept(client);
169- } else
170+ } else {
171 client_udprecv(client);
172+ }
173 client->newstate = NS_CLIENTSTATE_MAX;
174 return (true);
175 }
176@@ -492,41 +532,57 @@ exit_check(ns_client_t *client) {
177 /*
178 * We are trying to enter the inactive state.
179 */
180- if (client->naccepts > 0)
181+ if (client->naccepts > 0) {
182 isc_socket_cancel(client->tcplistener, client->task,
183 ISC_SOCKCANCEL_ACCEPT);
184+ }
185
186 /* Still waiting for accept cancel completion. */
187- if (! (client->naccepts == 0))
188+ if (! (client->naccepts == 0)) {
189 return (true);
190+ }
191
192 /* Accept cancel is complete. */
193- if (client->nrecvs > 0)
194+ if (client->nrecvs > 0) {
195 isc_socket_cancel(client->udpsocket, client->task,
196 ISC_SOCKCANCEL_RECV);
197+ }
198
199 /* Still waiting for recv cancel completion. */
200- if (! (client->nrecvs == 0))
201+ if (! (client->nrecvs == 0)) {
202 return (true);
203+ }
204
205 /* Still waiting for control event to be delivered */
206- if (client->nctls > 0)
207+ if (client->nctls > 0) {
208 return (true);
209-
210- /* Deactivate the client. */
211- if (client->interface)
212- ns_interface_detach(&client->interface);
213+ }
214
215 INSIST(client->naccepts == 0);
216 INSIST(client->recursionquota == NULL);
217- if (client->tcplistener != NULL)
218+ if (client->tcplistener != NULL) {
219 isc_socket_detach(&client->tcplistener);
220
221- if (client->udpsocket != NULL)
222+ if (client->tcpactive) {
223+ LOCK(&client->interface->lock);
224+ INSIST(client->interface->ntcpactive > 0);
225+ client->interface->ntcpactive--;
226+ UNLOCK(&client->interface->lock);
227+ client->tcpactive = false;
228+ }
229+ }
230+ if (client->udpsocket != NULL) {
231 isc_socket_detach(&client->udpsocket);
232+ }
233
234- if (client->dispatch != NULL)
235+ /* Deactivate the client. */
236+ if (client->interface != NULL) {
237+ ns_interface_detach(&client->interface);
238+ }
239+
240+ if (client->dispatch != NULL) {
241 dns_dispatch_detach(&client->dispatch);
242+ }
243
244 client->attributes = 0;
245 client->mortal = false;
246@@ -551,10 +607,13 @@ exit_check(ns_client_t *client) {
247 client->newstate = NS_CLIENTSTATE_MAX;
248 if (!ns_g_clienttest && manager != NULL &&
249 !manager->exiting)
250+ {
251 ISC_QUEUE_PUSH(manager->inactive, client,
252 ilink);
253- if (client->needshutdown)
254+ }
255+ if (client->needshutdown) {
256 isc_task_shutdown(client->task);
257+ }
258 return (true);
259 }
260 }
261@@ -675,7 +734,6 @@ client_start(isc_task_t *task, isc_event_t *event) {
262 }
263 }
264
265-
266 /*%
267 * The client's task has received a shutdown event.
268 */
269@@ -2507,17 +2565,12 @@ client_request(isc_task_t *task, isc_event_t *event) {
270 /*
271 * Pipeline TCP query processing.
272 */
273- if (client->message->opcode != dns_opcode_query)
274+ if (client->message->opcode != dns_opcode_query) {
275 client->pipelined = false;
276+ }
277 if (TCP_CLIENT(client) && client->pipelined) {
278- result = isc_quota_reserve(&ns_g_server->tcpquota);
279- if (result == ISC_R_SUCCESS)
280- result = ns_client_replace(client);
281+ result = ns_client_replace(client);
282 if (result != ISC_R_SUCCESS) {
283- ns_client_log(client, NS_LOGCATEGORY_CLIENT,
284- NS_LOGMODULE_CLIENT, ISC_LOG_WARNING,
285- "no more TCP clients(read): %s",
286- isc_result_totext(result));
287 client->pipelined = false;
288 }
289 }
290@@ -3087,6 +3140,7 @@ client_create(ns_clientmgr_t *manager, ns_client_t **clientp) {
291 client->filter_aaaa = dns_aaaa_ok;
292 #endif
293 client->needshutdown = ns_g_clienttest;
294+ client->tcpactive = false;
295
296 ISC_EVENT_INIT(&client->ctlevent, sizeof(client->ctlevent), 0, NULL,
297 NS_EVENT_CLIENTCONTROL, client_start, client, client,
298@@ -3100,6 +3154,7 @@ client_create(ns_clientmgr_t *manager, ns_client_t **clientp) {
299 client->formerrcache.id = 0;
300 ISC_LINK_INIT(client, link);
301 ISC_LINK_INIT(client, rlink);
302+ ISC_LINK_INIT(client, glink);
303 ISC_QLINK_INIT(client, ilink);
304 client->keytag = NULL;
305 client->keytag_len = 0;
306@@ -3193,12 +3248,19 @@ client_newconn(isc_task_t *task, isc_event_t *event) {
307
308 INSIST(client->state == NS_CLIENTSTATE_READY);
309
310+ /*
311+ * The accept() was successful and we're now establishing a new
312+ * connection. We need to make note of it in the client and
313+ * interface objects so client objects can do the right thing
314+ * when going inactive in exit_check() (see comments in
315+ * client_accept() for details).
316+ */
317 INSIST(client->naccepts == 1);
318 client->naccepts--;
319
320 LOCK(&client->interface->lock);
321- INSIST(client->interface->ntcpcurrent > 0);
322- client->interface->ntcpcurrent--;
323+ INSIST(client->interface->ntcpaccepting > 0);
324+ client->interface->ntcpaccepting--;
325 UNLOCK(&client->interface->lock);
326
327 /*
328@@ -3232,6 +3294,9 @@ client_newconn(isc_task_t *task, isc_event_t *event) {
329 NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(3),
330 "accept failed: %s",
331 isc_result_totext(nevent->result));
332+ if (client->tcpquota != NULL) {
333+ isc_quota_detach(&client->tcpquota);
334+ }
335 }
336
337 if (exit_check(client))
338@@ -3270,18 +3335,12 @@ client_newconn(isc_task_t *task, isc_event_t *event) {
339 * deny service to legitimate TCP clients.
340 */
341 client->pipelined = false;
342- result = isc_quota_attach(&ns_g_server->tcpquota,
343- &client->tcpquota);
344- if (result == ISC_R_SUCCESS)
345- result = ns_client_replace(client);
346- if (result != ISC_R_SUCCESS) {
347- ns_client_log(client, NS_LOGCATEGORY_CLIENT,
348- NS_LOGMODULE_CLIENT, ISC_LOG_WARNING,
349- "no more TCP clients(accept): %s",
350- isc_result_totext(result));
351- } else if (ns_g_server->keepresporder == NULL ||
352- !allowed(&netaddr, NULL, NULL, 0, NULL,
353- ns_g_server->keepresporder)) {
354+ result = ns_client_replace(client);
355+ if (result == ISC_R_SUCCESS &&
356+ (client->sctx->keepresporder == NULL ||
357+ !allowed(&netaddr, NULL, NULL, 0, NULL,
358+ ns_g_server->keepresporder)))
359+ {
360 client->pipelined = true;
361 }
362
363@@ -3298,12 +3357,80 @@ client_accept(ns_client_t *client) {
364
365 CTRACE("accept");
366
367+ /*
368+ * The tcpquota object can only be simultaneously referenced a
369+ * pre-defined number of times; this is configured by 'tcp-clients'
370+ * in named.conf. If we can't attach to it here, that means the TCP
371+ * client quota has been exceeded.
372+ */
373+ result = isc_quota_attach(&client->sctx->tcpquota,
374+ &client->tcpquota);
375+ if (result != ISC_R_SUCCESS) {
376+ bool exit;
377+
378+ ns_client_log(client, NS_LOGCATEGORY_CLIENT,
379+ NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(1),
380+ "no more TCP clients: %s",
381+ isc_result_totext(result));
382+
383+ /*
384+ * We have exceeded the system-wide TCP client
385+ * quota. But, we can't just block this accept
386+ * in all cases, because if we did, a heavy TCP
387+ * load on other interfaces might cause this
388+ * interface to be starved, with no clients able
389+ * to accept new connections.
390+ *
391+ * So, we check here to see if any other client
392+ * is already servicing TCP queries on this
393+ * interface (whether accepting, reading, or
394+ * processing).
395+ *
396+ * If so, then it's okay *not* to call
397+ * accept - we can let this client to go inactive
398+ * and the other one handle the next connection
399+ * when it's ready.
400+ *
401+ * But if not, then we need to be a little bit
402+ * flexible about the quota. We allow *one* extra
403+ * TCP client through, to ensure we're listening on
404+ * every interface.
405+ *
406+ * (Note: In practice this means that the *real*
407+ * TCP client quota is tcp-clients plus the number
408+ * of interfaces.)
409+ */
410+ LOCK(&client->interface->lock);
411+ exit = (client->interface->ntcpactive > 0);
412+ UNLOCK(&client->interface->lock);
413+
414+ if (exit) {
415+ client->newstate = NS_CLIENTSTATE_INACTIVE;
416+ (void)exit_check(client);
417+ return;
418+ }
419+ }
420+
421+ /*
422+ * By incrementing the interface's ntcpactive counter we signal
423+ * that there is at least one client servicing TCP queries for the
424+ * interface.
425+ *
426+ * We also make note of the fact in the client itself with the
427+ * tcpactive flag. This ensures proper accounting by preventing
428+ * us from accidentally incrementing or decrementing ntcpactive
429+ * more than once per client object.
430+ */
431+ if (!client->tcpactive) {
432+ LOCK(&client->interface->lock);
433+ client->interface->ntcpactive++;
434+ UNLOCK(&client->interface->lock);
435+ client->tcpactive = true;
436+ }
437+
438 result = isc_socket_accept(client->tcplistener, client->task,
439 client_newconn, client);
440 if (result != ISC_R_SUCCESS) {
441- UNEXPECTED_ERROR(__FILE__, __LINE__,
442- "isc_socket_accept() failed: %s",
443- isc_result_totext(result));
444 /*
445 * XXXRTH What should we do? We're trying to accept but
446 * it didn't work. If we just give up, then TCP
447@@ -3311,12 +3438,39 @@ client_accept(ns_client_t *client) {
448 *
449 * For now, we just go idle.
450 */
451+ UNEXPECTED_ERROR(__FILE__, __LINE__,
452+ "isc_socket_accept() failed: %s",
453+ isc_result_totext(result));
454+ if (client->tcpquota != NULL) {
455+ isc_quota_detach(&client->tcpquota);
456+ }
457 return;
458 }
459+
460+ /*
461+ * The client's 'naccepts' counter indicates that this client has
462+ * called accept() and is waiting for a new connection. It should
463+ * never exceed 1.
464+ */
465 INSIST(client->naccepts == 0);
466 client->naccepts++;
467+
468+ /*
469+ * The interface's 'ntcpaccepting' counter is incremented when
470+ * any client calls accept(), and decremented in client_newconn()
471+ * once the connection is established.
472+ *
473+ * When the client object is shutting down after handling a TCP
474+ * request (see exit_check()), it looks to see whether this value is
475+ * non-zero. If so, that means another client has already called
476+ * accept() and is waiting to establish the next connection, which
477+ * means the first client is free to go inactive. Otherwise,
478+ * the first client must come back and call accept() again; this
479+ * guarantees there will always be at least one client listening
480+ * for new TCP connections on each interface.
481+ */
482 LOCK(&client->interface->lock);
483- client->interface->ntcpcurrent++;
484+ client->interface->ntcpaccepting++;
485 UNLOCK(&client->interface->lock);
486 }
487
488@@ -3390,13 +3544,14 @@ ns_client_replace(ns_client_t *client) {
489 tcp = TCP_CLIENT(client);
490 if (tcp && client->pipelined) {
491 result = get_worker(client->manager, client->interface,
492- client->tcpsocket);
493+ client->tcpsocket, client);
494 } else {
495 result = get_client(client->manager, client->interface,
496 client->dispatch, tcp);
497 }
498- if (result != ISC_R_SUCCESS)
499+ if (result != ISC_R_SUCCESS) {
500 return (result);
501+ }
502
503 /*
504 * The responsibility for listening for new requests is hereby
505@@ -3585,6 +3740,7 @@ get_client(ns_clientmgr_t *manager, ns_interface_t *ifp,
506 client->attributes |= NS_CLIENTATTR_TCP;
507 isc_socket_attach(ifp->tcpsocket,
508 &client->tcplistener);
509+
510 } else {
511 isc_socket_t *sock;
512
513@@ -3602,7 +3758,8 @@ get_client(ns_clientmgr_t *manager, ns_interface_t *ifp,
514 }
515
516 static isc_result_t
517-get_worker(ns_clientmgr_t *manager, ns_interface_t *ifp, isc_socket_t *sock)
518+get_worker(ns_clientmgr_t *manager, ns_interface_t *ifp, isc_socket_t *sock,
519+ ns_client_t *oldclient)
520 {
521 isc_result_t result = ISC_R_SUCCESS;
522 isc_event_t *ev;
523@@ -3610,6 +3767,7 @@ get_worker(ns_clientmgr_t *manager, ns_interface_t *ifp, isc_socket_t *sock)
524 MTRACE("get worker");
525
526 REQUIRE(manager != NULL);
527+ REQUIRE(oldclient != NULL);
528
529 if (manager->exiting)
530 return (ISC_R_SHUTTINGDOWN);
531@@ -3642,7 +3800,28 @@ get_worker(ns_clientmgr_t *manager, ns_interface_t *ifp, isc_socket_t *sock)
532 ns_interface_attach(ifp, &client->interface);
533 client->newstate = client->state = NS_CLIENTSTATE_WORKING;
534 INSIST(client->recursionquota == NULL);
535- client->tcpquota = &ns_g_server->tcpquota;
536+
537+ /*
538+ * Transfer TCP quota to the new client.
539+ */
540+ INSIST(client->tcpquota == NULL);
541+ INSIST(oldclient->tcpquota != NULL);
542+ client->tcpquota = oldclient->tcpquota;
543+ oldclient->tcpquota = NULL;
544+
545+ /*
546+ * Link to a pipeline group, creating it if needed.
547+ */
548+ if (!ISC_LINK_LINKED(oldclient, glink)) {
549+ oldclient->glink.next = NULL;
550+ oldclient->glink.prev = NULL;
551+ }
552+ client->glink.next = oldclient->glink.next;
553+ client->glink.prev = oldclient;
554+ if (oldclient->glink.next != NULL) {
555+ oldclient->glink.next->glink.prev = client;
556+ }
557+ oldclient->glink.next = client;
558
559 client->dscp = ifp->dscp;
560
561@@ -3656,6 +3835,12 @@ get_worker(ns_clientmgr_t *manager, ns_interface_t *ifp, isc_socket_t *sock)
562 (void)isc_socket_getpeername(client->tcpsocket, &client->peeraddr);
563 client->peeraddr_valid = true;
564
565+ LOCK(&client->interface->lock);
566+ client->interface->ntcpactive++;
567+ UNLOCK(&client->interface->lock);
568+
569+ client->tcpactive = true;
570+
571 INSIST(client->tcpmsg_valid == false);
572 dns_tcpmsg_init(client->mctx, client->tcpsocket, &client->tcpmsg);
573 client->tcpmsg_valid = true;
574diff --git a/bin/named/include/named/client.h b/bin/named/include/named/client.h
575index b23a7b191d..1f7973f9c5 100644
576--- a/bin/named/include/named/client.h
577+++ b/bin/named/include/named/client.h
578@@ -94,7 +94,8 @@ struct ns_client {
579 int nupdates;
580 int nctls;
581 int references;
582- bool needshutdown; /*
583+ bool tcpactive;
584+ bool needshutdown; /*
585 * Used by clienttest to get
586 * the client to go from
587 * inactive to free state
588@@ -130,9 +131,9 @@ struct ns_client {
589 isc_stdtime_t now;
590 isc_time_t tnow;
591 dns_name_t signername; /*%< [T]SIG key name */
592- dns_name_t * signer; /*%< NULL if not valid sig */
593- bool mortal; /*%< Die after handling request */
594- bool pipelined; /*%< TCP queries not in sequence */
595+ dns_name_t *signer; /*%< NULL if not valid sig */
596+ bool mortal; /*%< Die after handling request */
597+ bool pipelined; /*%< TCP queries not in sequence */
598 isc_quota_t *tcpquota;
599 isc_quota_t *recursionquota;
600 ns_interface_t *interface;
601@@ -143,8 +144,8 @@ struct ns_client {
602 isc_sockaddr_t destsockaddr;
603
604 isc_netaddr_t ecs_addr; /*%< EDNS client subnet */
605- uint8_t ecs_addrlen;
606- uint8_t ecs_scope;
607+ uint8_t ecs_addrlen;
608+ uint8_t ecs_scope;
609
610 struct in6_pktinfo pktinfo;
611 isc_dscp_t dscp;
612@@ -166,6 +167,7 @@ struct ns_client {
613
614 ISC_LINK(ns_client_t) link;
615 ISC_LINK(ns_client_t) rlink;
616+ ISC_LINK(ns_client_t) glink;
617 ISC_QLINK(ns_client_t) ilink;
618 unsigned char cookie[8];
619 uint32_t expire;
620diff --git a/bin/named/include/named/interfacemgr.h b/bin/named/include/named/interfacemgr.h
621index 7d1883e1e8..61b08826a6 100644
622--- a/bin/named/include/named/interfacemgr.h
623+++ b/bin/named/include/named/interfacemgr.h
624@@ -77,9 +77,14 @@ struct ns_interface {
625 /*%< UDP dispatchers. */
626 isc_socket_t * tcpsocket; /*%< TCP socket. */
627 isc_dscp_t dscp; /*%< "listen-on" DSCP value */
628- int ntcptarget; /*%< Desired number of concurrent
629- TCP accepts */
630- int ntcpcurrent; /*%< Current ditto, locked */
631+ int ntcpaccepting; /*%< Number of clients
632+ ready to accept new
633+ TCP connections on this
634+ interface */
635+ int ntcpactive; /*%< Number of clients
636+ servicing TCP queries
637+ (whether accepting or
638+ connected) */
639 int nudpdispatch; /*%< Number of UDP dispatches */
640 ns_clientmgr_t * clientmgr; /*%< Client manager. */
641 ISC_LINK(ns_interface_t) link;
642diff --git a/bin/named/interfacemgr.c b/bin/named/interfacemgr.c
643index 419927bf54..955096ef47 100644
644--- a/bin/named/interfacemgr.c
645+++ b/bin/named/interfacemgr.c
646@@ -386,8 +386,8 @@ ns_interface_create(ns_interfacemgr_t *mgr, isc_sockaddr_t *addr,
647 * connections will be handled in parallel even though there is
648 * only one client initially.
649 */
650- ifp->ntcptarget = 1;
651- ifp->ntcpcurrent = 0;
652+ ifp->ntcpaccepting = 0;
653+ ifp->ntcpactive = 0;
654 ifp->nudpdispatch = 0;
655
656 ifp->dscp = -1;
657@@ -522,9 +522,7 @@ ns_interface_accepttcp(ns_interface_t *ifp) {
658 */
659 (void)isc_socket_filter(ifp->tcpsocket, "dataready");
660
661- result = ns_clientmgr_createclients(ifp->clientmgr,
662- ifp->ntcptarget, ifp,
663- true);
664+ result = ns_clientmgr_createclients(ifp->clientmgr, 1, ifp, true);
665 if (result != ISC_R_SUCCESS) {
666 UNEXPECTED_ERROR(__FILE__, __LINE__,
667 "TCP ns_clientmgr_createclients(): %s",
668--
6692.20.1
670
diff --git a/meta/recipes-connectivity/bind/bind/0003-use-reference-counter-for-pipeline-groups-v3.patch b/meta/recipes-connectivity/bind/bind/0003-use-reference-counter-for-pipeline-groups-v3.patch
new file mode 100644
index 0000000000..032cfb8c44
--- /dev/null
+++ b/meta/recipes-connectivity/bind/bind/0003-use-reference-counter-for-pipeline-groups-v3.patch
@@ -0,0 +1,278 @@
1Backport patch to fix CVE-2018-5743.
2
3Ref:
4https://security-tracker.debian.org/tracker/CVE-2018-5743
5
6CVE: CVE-2018-5743
7Upstream-Status: Backport [https://gitlab.isc.org/isc-projects/bind9/commit/366b4e1]
8
9Signed-off-by: Kai Kang <kai.kang@windriver.com>
10
11From 366b4e1ede8aed690e981e07137cb1cb77879c36 Mon Sep 17 00:00:00 2001
12From: =?UTF-8?q?Micha=C5=82=20K=C4=99pie=C5=84?= <michal@isc.org>
13Date: Thu, 17 Jan 2019 15:53:38 +0100
14Subject: [PATCH 3/6] use reference counter for pipeline groups (v3)
15
16Track pipeline groups using a shared reference counter
17instead of a linked list.
18
19(cherry picked from commit 513afd33eb17d5dc41a3f0d2d38204ef8c5f6f91)
20(cherry picked from commit 9446629b730c59c4215f08d37fbaf810282fbccb)
21---
22 bin/named/client.c | 171 ++++++++++++++++++++-----------
23 bin/named/include/named/client.h | 2 +-
24 2 files changed, 110 insertions(+), 63 deletions(-)
25
26diff --git a/bin/named/client.c b/bin/named/client.c
27index a7b49a0f71..277656cef0 100644
28--- a/bin/named/client.c
29+++ b/bin/named/client.c
30@@ -299,6 +299,75 @@ ns_client_settimeout(ns_client_t *client, unsigned int seconds) {
31 }
32 }
33
34+/*%
35+ * Allocate a reference counter that will track the number of client structures
36+ * using the TCP connection that 'client' called accept() for. This counter
37+ * will be shared between all client structures associated with this TCP
38+ * connection.
39+ */
40+static void
41+pipeline_init(ns_client_t *client) {
42+ isc_refcount_t *refs;
43+
44+ REQUIRE(client->pipeline_refs == NULL);
45+
46+ /*
47+ * A global memory context is used for the allocation as different
48+ * client structures may have different memory contexts assigned and a
49+ * reference counter allocated here might need to be freed by a
50+ * different client. The performance impact caused by memory context
51+ * contention here is expected to be negligible, given that this code
52+ * is only executed for TCP connections.
53+ */
54+ refs = isc_mem_allocate(client->sctx->mctx, sizeof(*refs));
55+ isc_refcount_init(refs, 1);
56+ client->pipeline_refs = refs;
57+}
58+
59+/*%
60+ * Increase the count of client structures using the TCP connection that
61+ * 'source' is associated with and put a pointer to that count in 'target',
62+ * thus associating it with the same TCP connection.
63+ */
64+static void
65+pipeline_attach(ns_client_t *source, ns_client_t *target) {
66+ int old_refs;
67+
68+ REQUIRE(source->pipeline_refs != NULL);
69+ REQUIRE(target->pipeline_refs == NULL);
70+
71+ old_refs = isc_refcount_increment(source->pipeline_refs);
72+ INSIST(old_refs > 0);
73+ target->pipeline_refs = source->pipeline_refs;
74+}
75+
76+/*%
77+ * Decrease the count of client structures using the TCP connection that
78+ * 'client' is associated with. If this is the last client using this TCP
79+ * connection, free the reference counter and return true; otherwise, return
80+ * false.
81+ */
82+static bool
83+pipeline_detach(ns_client_t *client) {
84+ isc_refcount_t *refs;
85+ int old_refs;
86+
87+ REQUIRE(client->pipeline_refs != NULL);
88+
89+ refs = client->pipeline_refs;
90+ client->pipeline_refs = NULL;
91+
92+ old_refs = isc_refcount_decrement(refs);
93+ INSIST(old_refs > 0);
94+
95+ if (old_refs == 1) {
96+ isc_mem_free(client->sctx->mctx, refs);
97+ return (true);
98+ }
99+
100+ return (false);
101+}
102+
103 /*%
104 * Check for a deactivation or shutdown request and take appropriate
105 * action. Returns true if either is in progress; in this case
106@@ -421,6 +490,40 @@ exit_check(ns_client_t *client) {
107 client->tcpmsg_valid = false;
108 }
109
110+ if (client->tcpquota != NULL) {
111+ if (client->pipeline_refs == NULL ||
112+ pipeline_detach(client))
113+ {
114+ /*
115+ * Only detach from the TCP client quota if
116+ * there are no more client structures using
117+ * this TCP connection.
118+ *
119+ * Note that we check 'pipeline_refs' and not
120+ * 'pipelined' because in some cases (e.g.
121+ * after receiving a request with an opcode
122+ * different than QUERY) 'pipelined' is set to
123+ * false after the reference counter gets
124+ * allocated in pipeline_init() and we must
125+ * still drop our reference as failing to do so
126+ * would prevent the reference counter itself
127+ * from being freed.
128+ */
129+ isc_quota_detach(&client->tcpquota);
130+ } else {
131+ /*
132+ * There are other client structures using this
133+ * TCP connection, so we cannot detach from the
134+ * TCP client quota to prevent excess TCP
135+ * connections from being accepted. However,
136+ * this client structure might later be reused
137+ * for accepting new connections and thus must
138+ * have its 'tcpquota' field set to NULL.
139+ */
140+ client->tcpquota = NULL;
141+ }
142+ }
143+
144 if (client->tcpsocket != NULL) {
145 CTRACE("closetcp");
146 isc_socket_detach(&client->tcpsocket);
147@@ -434,44 +537,6 @@ exit_check(ns_client_t *client) {
148 }
149 }
150
151- if (client->tcpquota != NULL) {
152- /*
153- * If we are not in a pipeline group, or
154- * we are the last client in the group, detach from
155- * tcpquota; otherwise, transfer the quota to
156- * another client in the same group.
157- */
158- if (!ISC_LINK_LINKED(client, glink) ||
159- (client->glink.next == NULL &&
160- client->glink.prev == NULL))
161- {
162- isc_quota_detach(&client->tcpquota);
163- } else if (client->glink.next != NULL) {
164- INSIST(client->glink.next->tcpquota == NULL);
165- client->glink.next->tcpquota = client->tcpquota;
166- client->tcpquota = NULL;
167- } else {
168- INSIST(client->glink.prev->tcpquota == NULL);
169- client->glink.prev->tcpquota = client->tcpquota;
170- client->tcpquota = NULL;
171- }
172- }
173-
174- /*
175- * Unlink from pipeline group.
176- */
177- if (ISC_LINK_LINKED(client, glink)) {
178- if (client->glink.next != NULL) {
179- client->glink.next->glink.prev =
180- client->glink.prev;
181- }
182- if (client->glink.prev != NULL) {
183- client->glink.prev->glink.next =
184- client->glink.next;
185- }
186- ISC_LINK_INIT(client, glink);
187- }
188-
189 if (client->timerset) {
190 (void)isc_timer_reset(client->timer,
191 isc_timertype_inactive,
192@@ -3130,6 +3195,7 @@ client_create(ns_clientmgr_t *manager, ns_client_t **clientp) {
193 dns_name_init(&client->signername, NULL);
194 client->mortal = false;
195 client->pipelined = false;
196+ client->pipeline_refs = NULL;
197 client->tcpquota = NULL;
198 client->recursionquota = NULL;
199 client->interface = NULL;
200@@ -3154,7 +3220,6 @@ client_create(ns_clientmgr_t *manager, ns_client_t **clientp) {
201 client->formerrcache.id = 0;
202 ISC_LINK_INIT(client, link);
203 ISC_LINK_INIT(client, rlink);
204- ISC_LINK_INIT(client, glink);
205 ISC_QLINK_INIT(client, ilink);
206 client->keytag = NULL;
207 client->keytag_len = 0;
208@@ -3341,6 +3406,7 @@ client_newconn(isc_task_t *task, isc_event_t *event) {
209 !allowed(&netaddr, NULL, NULL, 0, NULL,
210 ns_g_server->keepresporder)))
211 {
212+ pipeline_init(client);
213 client->pipelined = true;
214 }
215
216@@ -3800,35 +3866,16 @@ get_worker(ns_clientmgr_t *manager, ns_interface_t *ifp, isc_socket_t *sock,
217 ns_interface_attach(ifp, &client->interface);
218 client->newstate = client->state = NS_CLIENTSTATE_WORKING;
219 INSIST(client->recursionquota == NULL);
220-
221- /*
222- * Transfer TCP quota to the new client.
223- */
224- INSIST(client->tcpquota == NULL);
225- INSIST(oldclient->tcpquota != NULL);
226- client->tcpquota = oldclient->tcpquota;
227- oldclient->tcpquota = NULL;
228-
229- /*
230- * Link to a pipeline group, creating it if needed.
231- */
232- if (!ISC_LINK_LINKED(oldclient, glink)) {
233- oldclient->glink.next = NULL;
234- oldclient->glink.prev = NULL;
235- }
236- client->glink.next = oldclient->glink.next;
237- client->glink.prev = oldclient;
238- if (oldclient->glink.next != NULL) {
239- oldclient->glink.next->glink.prev = client;
240- }
241- oldclient->glink.next = client;
242+ client->tcpquota = &client->sctx->tcpquota;
243
244 client->dscp = ifp->dscp;
245
246 client->attributes |= NS_CLIENTATTR_TCP;
247- client->pipelined = true;
248 client->mortal = true;
249
250+ pipeline_attach(oldclient, client);
251+ client->pipelined = true;
252+
253 isc_socket_attach(ifp->tcpsocket, &client->tcplistener);
254 isc_socket_attach(sock, &client->tcpsocket);
255 isc_socket_setname(client->tcpsocket, "worker-tcp", NULL);
256diff --git a/bin/named/include/named/client.h b/bin/named/include/named/client.h
257index 1f7973f9c5..aeed9ccdda 100644
258--- a/bin/named/include/named/client.h
259+++ b/bin/named/include/named/client.h
260@@ -134,6 +134,7 @@ struct ns_client {
261 dns_name_t *signer; /*%< NULL if not valid sig */
262 bool mortal; /*%< Die after handling request */
263 bool pipelined; /*%< TCP queries not in sequence */
264+ isc_refcount_t *pipeline_refs;
265 isc_quota_t *tcpquota;
266 isc_quota_t *recursionquota;
267 ns_interface_t *interface;
268@@ -167,7 +168,6 @@ struct ns_client {
269
270 ISC_LINK(ns_client_t) link;
271 ISC_LINK(ns_client_t) rlink;
272- ISC_LINK(ns_client_t) glink;
273 ISC_QLINK(ns_client_t) ilink;
274 unsigned char cookie[8];
275 uint32_t expire;
276--
2772.20.1
278
diff --git a/meta/recipes-connectivity/bind/bind/0004-better-tcpquota-accounting-and-client-mortality-chec.patch b/meta/recipes-connectivity/bind/bind/0004-better-tcpquota-accounting-and-client-mortality-chec.patch
new file mode 100644
index 0000000000..034ab13303
--- /dev/null
+++ b/meta/recipes-connectivity/bind/bind/0004-better-tcpquota-accounting-and-client-mortality-chec.patch
@@ -0,0 +1,512 @@
1Backport patch to fix CVE-2018-5743.
2
3Ref:
4https://security-tracker.debian.org/tracker/CVE-2018-5743
5
6CVE: CVE-2018-5743
7Upstream-Status: Backport [https://gitlab.isc.org/isc-projects/bind9/commit/2ab8a08]
8
9Signed-off-by: Kai Kang <kai.kang@windriver.com>
10
11From 2ab8a085b3c666f28f1f9229bd6ecb59915b26c3 Mon Sep 17 00:00:00 2001
12From: Evan Hunt <each@isc.org>
13Date: Fri, 5 Apr 2019 16:12:18 -0700
14Subject: [PATCH 4/6] better tcpquota accounting and client mortality checks
15
16- ensure that tcpactive is cleaned up correctly when accept() fails.
17- set 'client->tcpattached' when the client is attached to the tcpquota.
18 carry this value on to new clients sharing the same pipeline group.
19 don't call isc_quota_detach() on the tcpquota unless tcpattached is
20 set. this way clients that were allowed to accept TCP connections
21 despite being over quota (and therefore, were never attached to the
22 quota) will not inadvertently detach from it and mess up the
23 accounting.
24- simplify the code for tcpquota disconnection by using a new function
25 tcpquota_disconnect().
26- before deciding whether to reject a new connection due to quota
27 exhaustion, check to see whether there are at least two active
28 clients. previously, this was "at least one", but that could be
29 insufficient if there was one other client in READING state (waiting
30 for messages on an open connection) but none in READY (listening
31 for new connections).
32- before deciding whether a TCP client object can to go inactive, we
33 must ensure there are enough other clients to maintain service
34 afterward -- both accepting new connections and reading/processing new
35 queries. A TCP client can't shut down unless at least one
36 client is accepting new connections and (in the case of pipelined
37 clients) at least one additional client is waiting to read.
38
39(cherry picked from commit c7394738b2445c16f728a88394864dd61baad900)
40(cherry picked from commit e965d5f11d3d0f6d59704e614fceca2093cb1856)
41(cherry picked from commit 87d431161450777ea093821212abfb52d51b36e3)
42---
43 bin/named/client.c | 244 +++++++++++++++++++------------
44 bin/named/include/named/client.h | 3 +-
45 2 files changed, 152 insertions(+), 95 deletions(-)
46
47diff --git a/bin/named/client.c b/bin/named/client.c
48index 277656cef0..61e96dd28c 100644
49--- a/bin/named/client.c
50+++ b/bin/named/client.c
51@@ -244,13 +244,14 @@ static void client_start(isc_task_t *task, isc_event_t *event);
52 static void client_request(isc_task_t *task, isc_event_t *event);
53 static void ns_client_dumpmessage(ns_client_t *client, const char *reason);
54 static isc_result_t get_client(ns_clientmgr_t *manager, ns_interface_t *ifp,
55- dns_dispatch_t *disp, bool tcp);
56+ dns_dispatch_t *disp, ns_client_t *oldclient,
57+ bool tcp);
58 static isc_result_t get_worker(ns_clientmgr_t *manager, ns_interface_t *ifp,
59 isc_socket_t *sock, ns_client_t *oldclient);
60 static inline bool
61 allowed(isc_netaddr_t *addr, dns_name_t *signer,
62 isc_netaddr_t *ecs_addr, uint8_t ecs_addrlen,
63- uint8_t *ecs_scope, dns_acl_t *acl)
64+ uint8_t *ecs_scope, dns_acl_t *acl);
65 static void compute_cookie(ns_client_t *client, uint32_t when,
66 uint32_t nonce, const unsigned char *secret,
67 isc_buffer_t *buf);
68@@ -319,7 +320,7 @@ pipeline_init(ns_client_t *client) {
69 * contention here is expected to be negligible, given that this code
70 * is only executed for TCP connections.
71 */
72- refs = isc_mem_allocate(client->sctx->mctx, sizeof(*refs));
73+ refs = isc_mem_allocate(ns_g_mctx, sizeof(*refs));
74 isc_refcount_init(refs, 1);
75 client->pipeline_refs = refs;
76 }
77@@ -331,13 +332,13 @@ pipeline_init(ns_client_t *client) {
78 */
79 static void
80 pipeline_attach(ns_client_t *source, ns_client_t *target) {
81- int old_refs;
82+ int refs;
83
84 REQUIRE(source->pipeline_refs != NULL);
85 REQUIRE(target->pipeline_refs == NULL);
86
87- old_refs = isc_refcount_increment(source->pipeline_refs);
88- INSIST(old_refs > 0);
89+ isc_refcount_increment(source->pipeline_refs, &refs);
90+ INSIST(refs > 1);
91 target->pipeline_refs = source->pipeline_refs;
92 }
93
94@@ -349,25 +350,51 @@ pipeline_attach(ns_client_t *source, ns_client_t *target) {
95 */
96 static bool
97 pipeline_detach(ns_client_t *client) {
98- isc_refcount_t *refs;
99- int old_refs;
100+ isc_refcount_t *refcount;
101+ int refs;
102
103 REQUIRE(client->pipeline_refs != NULL);
104
105- refs = client->pipeline_refs;
106+ refcount = client->pipeline_refs;
107 client->pipeline_refs = NULL;
108
109- old_refs = isc_refcount_decrement(refs);
110- INSIST(old_refs > 0);
111+ isc_refcount_decrement(refcount, refs);
112
113- if (old_refs == 1) {
114- isc_mem_free(client->sctx->mctx, refs);
115+ if (refs == 0) {
116+ isc_mem_free(ns_g_mctx, refs);
117 return (true);
118 }
119
120 return (false);
121 }
122
123+/*
124+ * Detach a client from the TCP client quota if appropriate, and set
125+ * the quota pointer to NULL.
126+ *
127+ * Sometimes when the TCP client quota is exhausted but there are no other
128+ * clients servicing the interface, a client will be allowed to continue
129+ * running despite not having been attached to the quota. In this event,
130+ * the TCP quota was never attached to the client, so when the client (or
131+ * associated pipeline group) shuts down, the quota must NOT be detached.
132+ *
133+ * Otherwise, if the quota pointer is set, it should be detached. If not
134+ * set at all, we just return without doing anything.
135+ */
136+static void
137+tcpquota_disconnect(ns_client_t *client) {
138+ if (client->tcpquota == NULL) {
139+ return;
140+ }
141+
142+ if (client->tcpattached) {
143+ isc_quota_detach(&client->tcpquota);
144+ client->tcpattached = false;
145+ } else {
146+ client->tcpquota = NULL;
147+ }
148+}
149+
150 /*%
151 * Check for a deactivation or shutdown request and take appropriate
152 * action. Returns true if either is in progress; in this case
153@@ -490,38 +517,31 @@ exit_check(ns_client_t *client) {
154 client->tcpmsg_valid = false;
155 }
156
157- if (client->tcpquota != NULL) {
158- if (client->pipeline_refs == NULL ||
159- pipeline_detach(client))
160- {
161- /*
162- * Only detach from the TCP client quota if
163- * there are no more client structures using
164- * this TCP connection.
165- *
166- * Note that we check 'pipeline_refs' and not
167- * 'pipelined' because in some cases (e.g.
168- * after receiving a request with an opcode
169- * different than QUERY) 'pipelined' is set to
170- * false after the reference counter gets
171- * allocated in pipeline_init() and we must
172- * still drop our reference as failing to do so
173- * would prevent the reference counter itself
174- * from being freed.
175- */
176- isc_quota_detach(&client->tcpquota);
177- } else {
178- /*
179- * There are other client structures using this
180- * TCP connection, so we cannot detach from the
181- * TCP client quota to prevent excess TCP
182- * connections from being accepted. However,
183- * this client structure might later be reused
184- * for accepting new connections and thus must
185- * have its 'tcpquota' field set to NULL.
186- */
187- client->tcpquota = NULL;
188- }
189+ /*
190+ * Detach from pipeline group and from TCP client quota,
191+ * if appropriate.
192+ *
193+ * - If no pipeline group is active, attempt to
194+ * detach from the TCP client quota.
195+ *
196+ * - If a pipeline group is active, detach from it;
197+ * if the return code indicates that there no more
198+ * clients left if this pipeline group, we also detach
199+ * from the TCP client quota.
200+ *
201+ * - Otherwise we don't try to detach, we just set the
202+ * TCP quota pointer to NULL if it wasn't NULL already.
203+ *
204+ * tcpquota_disconnect() will set tcpquota to NULL, either
205+ * by detaching it or by assignment, depending on the
206+ * needs of the client. See the comments on that function
207+ * for further information.
208+ */
209+ if (client->pipeline_refs == NULL || pipeline_detach(client)) {
210+ tcpquota_disconnect(client);
211+ } else {
212+ client->tcpquota = NULL;
213+ client->tcpattached = false;
214 }
215
216 if (client->tcpsocket != NULL) {
217@@ -544,8 +564,6 @@ exit_check(ns_client_t *client) {
218 client->timerset = false;
219 }
220
221- client->pipelined = false;
222-
223 client->peeraddr_valid = false;
224
225 client->state = NS_CLIENTSTATE_READY;
226@@ -558,18 +576,27 @@ exit_check(ns_client_t *client) {
227 * active and force it to go inactive if not.
228 *
229 * UDP clients go inactive at this point, but a TCP client
230- * will needs to remain active if no other clients are
231- * listening for TCP requests on this interface, to
232- * prevent this interface from going nonresponsive.
233+ * may need to remain active and go into ready state if
234+ * no other clients are available to listen for TCP
235+ * requests on this interface or (in the case of pipelined
236+ * clients) to read for additional messages on the current
237+ * connection.
238 */
239 if (client->mortal && TCP_CLIENT(client) && !ns_g_clienttest) {
240 LOCK(&client->interface->lock);
241- if (client->interface->ntcpaccepting == 0) {
242+ if ((client->interface->ntcpaccepting == 0 ||
243+ (client->pipelined &&
244+ client->interface->ntcpactive < 2)) &&
245+ client->newstate != NS_CLIENTSTATE_FREED)
246+ {
247 client->mortal = false;
248+ client->newstate = NS_CLIENTSTATE_READY;
249 }
250 UNLOCK(&client->interface->lock);
251 }
252
253+ client->pipelined = false;
254+
255 /*
256 * We don't need the client; send it to the inactive
257 * queue for recycling.
258@@ -2634,6 +2661,18 @@ client_request(isc_task_t *task, isc_event_t *event) {
259 client->pipelined = false;
260 }
261 if (TCP_CLIENT(client) && client->pipelined) {
262+ /*
263+ * We're pipelining. Replace the client; the
264+ * the replacement can read the TCP socket looking
265+ * for new messages and this client can process the
266+ * current message asynchronously.
267+ *
268+ * There are now at least three clients using this
269+ * TCP socket - one accepting new connections,
270+ * one reading an existing connection to get new
271+ * messages, and one answering the message already
272+ * received.
273+ */
274 result = ns_client_replace(client);
275 if (result != ISC_R_SUCCESS) {
276 client->pipelined = false;
277@@ -3197,6 +3236,7 @@ client_create(ns_clientmgr_t *manager, ns_client_t **clientp) {
278 client->pipelined = false;
279 client->pipeline_refs = NULL;
280 client->tcpquota = NULL;
281+ client->tcpattached = false;
282 client->recursionquota = NULL;
283 client->interface = NULL;
284 client->peeraddr_valid = false;
285@@ -3359,9 +3399,7 @@ client_newconn(isc_task_t *task, isc_event_t *event) {
286 NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(3),
287 "accept failed: %s",
288 isc_result_totext(nevent->result));
289- if (client->tcpquota != NULL) {
290- isc_quota_detach(&client->tcpquota);
291- }
292+ tcpquota_disconnect(client);
293 }
294
295 if (exit_check(client))
296@@ -3402,7 +3440,7 @@ client_newconn(isc_task_t *task, isc_event_t *event) {
297 client->pipelined = false;
298 result = ns_client_replace(client);
299 if (result == ISC_R_SUCCESS &&
300- (client->sctx->keepresporder == NULL ||
301+ (ns_g_server->keepresporder == NULL ||
302 !allowed(&netaddr, NULL, NULL, 0, NULL,
303 ns_g_server->keepresporder)))
304 {
305@@ -3429,7 +3467,7 @@ client_accept(ns_client_t *client) {
306 * in named.conf. If we can't attach to it here, that means the TCP
307 * client quota has been exceeded.
308 */
309- result = isc_quota_attach(&client->sctx->tcpquota,
310+ result = isc_quota_attach(&ns_g_server->tcpquota,
311 &client->tcpquota);
312 if (result != ISC_R_SUCCESS) {
313 bool exit;
314@@ -3447,27 +3485,27 @@ client_accept(ns_client_t *client) {
315 * interface to be starved, with no clients able
316 * to accept new connections.
317 *
318- * So, we check here to see if any other client
319- * is already servicing TCP queries on this
320+ * So, we check here to see if any other clients
321+ * are already servicing TCP queries on this
322 * interface (whether accepting, reading, or
323- * processing).
324- *
325- * If so, then it's okay *not* to call
326- * accept - we can let this client to go inactive
327- * and the other one handle the next connection
328- * when it's ready.
329+ * processing). If there are at least two
330+ * (one reading and one processing a request)
331+ * then it's okay *not* to call accept - we
332+ * can let this client go inactive and another
333+ * one will resume accepting when it's done.
334 *
335- * But if not, then we need to be a little bit
336- * flexible about the quota. We allow *one* extra
337- * TCP client through, to ensure we're listening on
338- * every interface.
339+ * If there aren't enough active clients on the
340+ * interface, then we can be a little bit
341+ * flexible about the quota. We'll allow *one*
342+ * extra client through to ensure we're listening
343+ * on every interface.
344 *
345- * (Note: In practice this means that the *real*
346- * TCP client quota is tcp-clients plus the number
347- * of interfaces.)
348+ * (Note: In practice this means that the real
349+ * TCP client quota is tcp-clients plus the
350+ * number of listening interfaces plus 2.)
351 */
352 LOCK(&client->interface->lock);
353- exit = (client->interface->ntcpactive > 0);
354+ exit = (client->interface->ntcpactive > 1);
355 UNLOCK(&client->interface->lock);
356
357 if (exit) {
358@@ -3475,6 +3513,9 @@ client_accept(ns_client_t *client) {
359 (void)exit_check(client);
360 return;
361 }
362+
363+ } else {
364+ client->tcpattached = true;
365 }
366
367 /*
368@@ -3507,9 +3548,16 @@ client_accept(ns_client_t *client) {
369 UNEXPECTED_ERROR(__FILE__, __LINE__,
370 "isc_socket_accept() failed: %s",
371 isc_result_totext(result));
372- if (client->tcpquota != NULL) {
373- isc_quota_detach(&client->tcpquota);
374+
375+ tcpquota_disconnect(client);
376+
377+ if (client->tcpactive) {
378+ LOCK(&client->interface->lock);
379+ client->interface->ntcpactive--;
380+ UNLOCK(&client->interface->lock);
381+ client->tcpactive = false;
382 }
383+
384 return;
385 }
386
387@@ -3527,13 +3575,12 @@ client_accept(ns_client_t *client) {
388 * once the connection is established.
389 *
390 * When the client object is shutting down after handling a TCP
391- * request (see exit_check()), it looks to see whether this value is
392- * non-zero. If so, that means another client has already called
393- * accept() and is waiting to establish the next connection, which
394- * means the first client is free to go inactive. Otherwise,
395- * the first client must come back and call accept() again; this
396- * guarantees there will always be at least one client listening
397- * for new TCP connections on each interface.
398+ * request (see exit_check()), if this value is at least one, that
399+ * means another client has called accept() and is waiting to
400+ * establish the next connection. That means the client may be
401+ * be free to become inactive; otherwise it may need to start
402+ * listening for connections itself to prevent the interface
403+ * going dead.
404 */
405 LOCK(&client->interface->lock);
406 client->interface->ntcpaccepting++;
407@@ -3613,19 +3660,19 @@ ns_client_replace(ns_client_t *client) {
408 client->tcpsocket, client);
409 } else {
410 result = get_client(client->manager, client->interface,
411- client->dispatch, tcp);
412+ client->dispatch, client, tcp);
413+
414+ /*
415+ * The responsibility for listening for new requests is hereby
416+ * transferred to the new client. Therefore, the old client
417+ * should refrain from listening for any more requests.
418+ */
419+ client->mortal = true;
420 }
421 if (result != ISC_R_SUCCESS) {
422 return (result);
423 }
424
425- /*
426- * The responsibility for listening for new requests is hereby
427- * transferred to the new client. Therefore, the old client
428- * should refrain from listening for any more requests.
429- */
430- client->mortal = true;
431-
432 return (ISC_R_SUCCESS);
433 }
434
435@@ -3759,7 +3806,7 @@ ns_clientmgr_destroy(ns_clientmgr_t **managerp) {
436
437 static isc_result_t
438 get_client(ns_clientmgr_t *manager, ns_interface_t *ifp,
439- dns_dispatch_t *disp, bool tcp)
440+ dns_dispatch_t *disp, ns_client_t *oldclient, bool tcp)
441 {
442 isc_result_t result = ISC_R_SUCCESS;
443 isc_event_t *ev;
444@@ -3803,6 +3850,16 @@ get_client(ns_clientmgr_t *manager, ns_interface_t *ifp,
445 client->dscp = ifp->dscp;
446
447 if (tcp) {
448+ client->tcpattached = false;
449+ if (oldclient != NULL) {
450+ client->tcpattached = oldclient->tcpattached;
451+ }
452+
453+ LOCK(&client->interface->lock);
454+ client->interface->ntcpactive++;
455+ UNLOCK(&client->interface->lock);
456+ client->tcpactive = true;
457+
458 client->attributes |= NS_CLIENTATTR_TCP;
459 isc_socket_attach(ifp->tcpsocket,
460 &client->tcplistener);
461@@ -3866,7 +3923,8 @@ get_worker(ns_clientmgr_t *manager, ns_interface_t *ifp, isc_socket_t *sock,
462 ns_interface_attach(ifp, &client->interface);
463 client->newstate = client->state = NS_CLIENTSTATE_WORKING;
464 INSIST(client->recursionquota == NULL);
465- client->tcpquota = &client->sctx->tcpquota;
466+ client->tcpquota = &ns_g_server->tcpquota;
467+ client->tcpattached = oldclient->tcpattached;
468
469 client->dscp = ifp->dscp;
470
471@@ -3885,7 +3943,6 @@ get_worker(ns_clientmgr_t *manager, ns_interface_t *ifp, isc_socket_t *sock,
472 LOCK(&client->interface->lock);
473 client->interface->ntcpactive++;
474 UNLOCK(&client->interface->lock);
475-
476 client->tcpactive = true;
477
478 INSIST(client->tcpmsg_valid == false);
479@@ -3913,7 +3970,8 @@ ns_clientmgr_createclients(ns_clientmgr_t *manager, unsigned int n,
480 MTRACE("createclients");
481
482 for (disp = 0; disp < n; disp++) {
483- result = get_client(manager, ifp, ifp->udpdispatch[disp], tcp);
484+ result = get_client(manager, ifp, ifp->udpdispatch[disp],
485+ NULL, tcp);
486 if (result != ISC_R_SUCCESS)
487 break;
488 }
489diff --git a/bin/named/include/named/client.h b/bin/named/include/named/client.h
490index aeed9ccdda..e2c40acd28 100644
491--- a/bin/named/include/named/client.h
492+++ b/bin/named/include/named/client.h
493@@ -9,8 +9,6 @@
494 * information regarding copyright ownership.
495 */
496
497-/* $Id: client.h,v 1.96 2012/01/31 23:47:31 tbox Exp $ */
498-
499 #ifndef NAMED_CLIENT_H
500 #define NAMED_CLIENT_H 1
501
502@@ -136,6 +134,7 @@ struct ns_client {
503 bool pipelined; /*%< TCP queries not in sequence */
504 isc_refcount_t *pipeline_refs;
505 isc_quota_t *tcpquota;
506+ bool tcpattached;
507 isc_quota_t *recursionquota;
508 ns_interface_t *interface;
509
510--
5112.20.1
512
diff --git a/meta/recipes-connectivity/bind/bind/0005-refactor-tcpquota-and-pipeline-refs-allow-special-ca.patch b/meta/recipes-connectivity/bind/bind/0005-refactor-tcpquota-and-pipeline-refs-allow-special-ca.patch
new file mode 100644
index 0000000000..987e75bc0e
--- /dev/null
+++ b/meta/recipes-connectivity/bind/bind/0005-refactor-tcpquota-and-pipeline-refs-allow-special-ca.patch
@@ -0,0 +1,911 @@
1Backport patch to fix CVE-2018-5743.
2
3Ref:
4https://security-tracker.debian.org/tracker/CVE-2018-5743
5
6CVE: CVE-2018-5743
7Upstream-Status: Backport [https://gitlab.isc.org/isc-projects/bind9/commit/c47ccf6]
8
9Signed-off-by: Kai Kang <kai.kang@windriver.com>
10
11From c47ccf630f147378568b33e8fdb7b754f228c346 Mon Sep 17 00:00:00 2001
12From: Evan Hunt <each@isc.org>
13Date: Fri, 5 Apr 2019 16:26:05 -0700
14Subject: [PATCH 5/6] refactor tcpquota and pipeline refs; allow special-case
15 overrun in isc_quota
16
17- if the TCP quota has been exceeded but there are no clients listening
18 for new connections on the interface, we can now force attachment to the
19 quota using isc_quota_force(), instead of carrying on with the quota not
20 attached.
21- the TCP client quota is now referenced via a reference-counted
22 'ns_tcpconn' object, one of which is created whenever a client begins
23 listening for new connections, and attached to by members of that
24 client's pipeline group. when the last reference to the tcpconn
25 object is detached, it is freed and the TCP quota slot is released.
26- reduce code duplication by adding mark_tcp_active() function.
27- convert counters to atomic.
28
29(cherry picked from commit 7e8222378ca24f1302a0c1c638565050ab04681b)
30(cherry picked from commit 4939451275722bfda490ea86ca13e84f6bc71e46)
31(cherry picked from commit 13f7c918b8720d890408f678bd73c20e634539d9)
32---
33 bin/named/client.c | 444 +++++++++++--------------
34 bin/named/include/named/client.h | 12 +-
35 bin/named/include/named/interfacemgr.h | 6 +-
36 bin/named/interfacemgr.c | 1 +
37 lib/isc/include/isc/quota.h | 7 +
38 lib/isc/quota.c | 33 +-
39 lib/isc/win32/libisc.def.in | 1 +
40 7 files changed, 236 insertions(+), 268 deletions(-)
41
42diff --git a/bin/named/client.c b/bin/named/client.c
43index 61e96dd28c..d826ab32bf 100644
44--- a/bin/named/client.c
45+++ b/bin/named/client.c
46@@ -244,8 +244,7 @@ static void client_start(isc_task_t *task, isc_event_t *event);
47 static void client_request(isc_task_t *task, isc_event_t *event);
48 static void ns_client_dumpmessage(ns_client_t *client, const char *reason);
49 static isc_result_t get_client(ns_clientmgr_t *manager, ns_interface_t *ifp,
50- dns_dispatch_t *disp, ns_client_t *oldclient,
51- bool tcp);
52+ dns_dispatch_t *disp, bool tcp);
53 static isc_result_t get_worker(ns_clientmgr_t *manager, ns_interface_t *ifp,
54 isc_socket_t *sock, ns_client_t *oldclient);
55 static inline bool
56@@ -301,16 +300,32 @@ ns_client_settimeout(ns_client_t *client, unsigned int seconds) {
57 }
58
59 /*%
60- * Allocate a reference counter that will track the number of client structures
61- * using the TCP connection that 'client' called accept() for. This counter
62- * will be shared between all client structures associated with this TCP
63- * connection.
64+ * Allocate a reference-counted object that will maintain a single pointer to
65+ * the (also reference-counted) TCP client quota, shared between all the
66+ * clients processing queries on a single TCP connection, so that all
67+ * clients sharing the one socket will together consume only one slot in
68+ * the 'tcp-clients' quota.
69 */
70-static void
71-pipeline_init(ns_client_t *client) {
72- isc_refcount_t *refs;
73+static isc_result_t
74+tcpconn_init(ns_client_t *client, bool force) {
75+ isc_result_t result;
76+ isc_quota_t *quota = NULL;
77+ ns_tcpconn_t *tconn = NULL;
78
79- REQUIRE(client->pipeline_refs == NULL);
80+ REQUIRE(client->tcpconn == NULL);
81+
82+ /*
83+ * Try to attach to the quota first, so we won't pointlessly
84+ * allocate memory for a tcpconn object if we can't get one.
85+ */
86+ if (force) {
87+ result = isc_quota_force(&ns_g_server->tcpquota, &quota);
88+ } else {
89+ result = isc_quota_attach(&ns_g_server->tcpquota, &quota);
90+ }
91+ if (result != ISC_R_SUCCESS) {
92+ return (result);
93+ }
94
95 /*
96 * A global memory context is used for the allocation as different
97@@ -320,78 +335,80 @@ pipeline_init(ns_client_t *client) {
98 * contention here is expected to be negligible, given that this code
99 * is only executed for TCP connections.
100 */
101- refs = isc_mem_allocate(ns_g_mctx, sizeof(*refs));
102- isc_refcount_init(refs, 1);
103- client->pipeline_refs = refs;
104+ tconn = isc_mem_allocate(ns_g_mctx, sizeof(*tconn));
105+
106+ isc_refcount_init(&tconn->refs, 1);
107+ tconn->tcpquota = quota;
108+ quota = NULL;
109+ tconn->pipelined = false;
110+
111+ client->tcpconn = tconn;
112+
113+ return (ISC_R_SUCCESS);
114 }
115
116 /*%
117- * Increase the count of client structures using the TCP connection that
118- * 'source' is associated with and put a pointer to that count in 'target',
119- * thus associating it with the same TCP connection.
120+ * Increase the count of client structures sharing the TCP connection
121+ * that 'source' is associated with; add a pointer to the same tcpconn
122+ * to 'target', thus associating it with the same TCP connection.
123 */
124 static void
125-pipeline_attach(ns_client_t *source, ns_client_t *target) {
126+tcpconn_attach(ns_client_t *source, ns_client_t *target) {
127 int refs;
128
129- REQUIRE(source->pipeline_refs != NULL);
130- REQUIRE(target->pipeline_refs == NULL);
131+ REQUIRE(source->tcpconn != NULL);
132+ REQUIRE(target->tcpconn == NULL);
133+ REQUIRE(source->tcpconn->pipelined);
134
135- isc_refcount_increment(source->pipeline_refs, &refs);
136+ isc_refcount_increment(&source->tcpconn->refs, &refs);
137 INSIST(refs > 1);
138- target->pipeline_refs = source->pipeline_refs;
139+ target->tcpconn = source->tcpconn;
140 }
141
142 /*%
143- * Decrease the count of client structures using the TCP connection that
144+ * Decrease the count of client structures sharing the TCP connection that
145 * 'client' is associated with. If this is the last client using this TCP
146- * connection, free the reference counter and return true; otherwise, return
147- * false.
148+ * connection, we detach from the TCP quota and free the tcpconn
149+ * object. Either way, client->tcpconn is set to NULL.
150 */
151-static bool
152-pipeline_detach(ns_client_t *client) {
153- isc_refcount_t *refcount;
154+static void
155+tcpconn_detach(ns_client_t *client) {
156+ ns_tcpconn_t *tconn = NULL;
157 int refs;
158
159- REQUIRE(client->pipeline_refs != NULL);
160-
161- refcount = client->pipeline_refs;
162- client->pipeline_refs = NULL;
163+ REQUIRE(client->tcpconn != NULL);
164
165- isc_refcount_decrement(refcount, refs);
166+ tconn = client->tcpconn;
167+ client->tcpconn = NULL;
168
169+ isc_refcount_decrement(&tconn->refs, &refs);
170 if (refs == 0) {
171- isc_mem_free(ns_g_mctx, refs);
172- return (true);
173+ isc_quota_detach(&tconn->tcpquota);
174+ isc_mem_free(ns_g_mctx, tconn);
175 }
176-
177- return (false);
178 }
179
180-/*
181- * Detach a client from the TCP client quota if appropriate, and set
182- * the quota pointer to NULL.
183- *
184- * Sometimes when the TCP client quota is exhausted but there are no other
185- * clients servicing the interface, a client will be allowed to continue
186- * running despite not having been attached to the quota. In this event,
187- * the TCP quota was never attached to the client, so when the client (or
188- * associated pipeline group) shuts down, the quota must NOT be detached.
189+/*%
190+ * Mark a client as active and increment the interface's 'ntcpactive'
191+ * counter, as a signal that there is at least one client servicing
192+ * TCP queries for the interface. If we reach the TCP client quota at
193+ * some point, this will be used to determine whether a quota overrun
194+ * should be permitted.
195 *
196- * Otherwise, if the quota pointer is set, it should be detached. If not
197- * set at all, we just return without doing anything.
198+ * Marking the client active with the 'tcpactive' flag ensures proper
199+ * accounting, by preventing us from incrementing or decrementing
200+ * 'ntcpactive' more than once per client.
201 */
202 static void
203-tcpquota_disconnect(ns_client_t *client) {
204- if (client->tcpquota == NULL) {
205- return;
206- }
207-
208- if (client->tcpattached) {
209- isc_quota_detach(&client->tcpquota);
210- client->tcpattached = false;
211- } else {
212- client->tcpquota = NULL;
213+mark_tcp_active(ns_client_t *client, bool active) {
214+ if (active && !client->tcpactive) {
215+ isc_atomic_xadd(&client->interface->ntcpactive, 1);
216+ client->tcpactive = active;
217+ } else if (!active && client->tcpactive) {
218+ uint32_t old =
219+ isc_atomic_xadd(&client->interface->ntcpactive, -1);
220+ INSIST(old > 0);
221+ client->tcpactive = active;
222 }
223 }
224
225@@ -484,7 +501,8 @@ exit_check(ns_client_t *client) {
226 INSIST(client->recursionquota == NULL);
227
228 if (NS_CLIENTSTATE_READING == client->newstate) {
229- if (!client->pipelined) {
230+ INSIST(client->tcpconn != NULL);
231+ if (!client->tcpconn->pipelined) {
232 client_read(client);
233 client->newstate = NS_CLIENTSTATE_MAX;
234 return (true); /* We're done. */
235@@ -507,8 +525,8 @@ exit_check(ns_client_t *client) {
236 dns_tcpmsg_cancelread(&client->tcpmsg);
237 }
238
239- if (client->nreads != 0) {
240- /* Still waiting for read cancel completion. */
241+ /* Still waiting for read cancel completion. */
242+ if (client->nreads > 0) {
243 return (true);
244 }
245
246@@ -518,43 +536,45 @@ exit_check(ns_client_t *client) {
247 }
248
249 /*
250- * Detach from pipeline group and from TCP client quota,
251- * if appropriate.
252+ * Soon the client will be ready to accept a new TCP
253+ * connection or UDP request, but we may have enough
254+ * clients doing that already. Check whether this client
255+ * needs to remain active and allow it go inactive if
256+ * not.
257 *
258- * - If no pipeline group is active, attempt to
259- * detach from the TCP client quota.
260+ * UDP clients always go inactive at this point, but a TCP
261+ * client may need to stay active and return to READY
262+ * state if no other clients are available to listen
263+ * for TCP requests on this interface.
264 *
265- * - If a pipeline group is active, detach from it;
266- * if the return code indicates that there no more
267- * clients left if this pipeline group, we also detach
268- * from the TCP client quota.
269- *
270- * - Otherwise we don't try to detach, we just set the
271- * TCP quota pointer to NULL if it wasn't NULL already.
272- *
273- * tcpquota_disconnect() will set tcpquota to NULL, either
274- * by detaching it or by assignment, depending on the
275- * needs of the client. See the comments on that function
276- * for further information.
277+ * Regardless, if we're going to FREED state, that means
278+ * the system is shutting down and we don't need to
279+ * retain clients.
280 */
281- if (client->pipeline_refs == NULL || pipeline_detach(client)) {
282- tcpquota_disconnect(client);
283- } else {
284- client->tcpquota = NULL;
285- client->tcpattached = false;
286+ if (client->mortal && TCP_CLIENT(client) &&
287+ client->newstate != NS_CLIENTSTATE_FREED &&
288+ !ns_g_clienttest &&
289+ isc_atomic_xadd(&client->interface->ntcpaccepting, 0) == 0)
290+ {
291+ /* Nobody else is accepting */
292+ client->mortal = false;
293+ client->newstate = NS_CLIENTSTATE_READY;
294+ }
295+
296+ /*
297+ * Detach from TCP connection and TCP client quota,
298+ * if appropriate. If this is the last reference to
299+ * the TCP connection in our pipeline group, the
300+ * TCP quota slot will be released.
301+ */
302+ if (client->tcpconn) {
303+ tcpconn_detach(client);
304 }
305
306 if (client->tcpsocket != NULL) {
307 CTRACE("closetcp");
308 isc_socket_detach(&client->tcpsocket);
309-
310- if (client->tcpactive) {
311- LOCK(&client->interface->lock);
312- INSIST(client->interface->ntcpactive > 0);
313- client->interface->ntcpactive--;
314- UNLOCK(&client->interface->lock);
315- client->tcpactive = false;
316- }
317+ mark_tcp_active(client, false);
318 }
319
320 if (client->timerset) {
321@@ -567,35 +587,6 @@ exit_check(ns_client_t *client) {
322 client->peeraddr_valid = false;
323
324 client->state = NS_CLIENTSTATE_READY;
325- INSIST(client->recursionquota == NULL);
326-
327- /*
328- * Now the client is ready to accept a new TCP connection
329- * or UDP request, but we may have enough clients doing
330- * that already. Check whether this client needs to remain
331- * active and force it to go inactive if not.
332- *
333- * UDP clients go inactive at this point, but a TCP client
334- * may need to remain active and go into ready state if
335- * no other clients are available to listen for TCP
336- * requests on this interface or (in the case of pipelined
337- * clients) to read for additional messages on the current
338- * connection.
339- */
340- if (client->mortal && TCP_CLIENT(client) && !ns_g_clienttest) {
341- LOCK(&client->interface->lock);
342- if ((client->interface->ntcpaccepting == 0 ||
343- (client->pipelined &&
344- client->interface->ntcpactive < 2)) &&
345- client->newstate != NS_CLIENTSTATE_FREED)
346- {
347- client->mortal = false;
348- client->newstate = NS_CLIENTSTATE_READY;
349- }
350- UNLOCK(&client->interface->lock);
351- }
352-
353- client->pipelined = false;
354
355 /*
356 * We don't need the client; send it to the inactive
357@@ -630,7 +621,7 @@ exit_check(ns_client_t *client) {
358 }
359
360 /* Still waiting for accept cancel completion. */
361- if (! (client->naccepts == 0)) {
362+ if (client->naccepts > 0) {
363 return (true);
364 }
365
366@@ -641,7 +632,7 @@ exit_check(ns_client_t *client) {
367 }
368
369 /* Still waiting for recv cancel completion. */
370- if (! (client->nrecvs == 0)) {
371+ if (client->nrecvs > 0) {
372 return (true);
373 }
374
375@@ -654,14 +645,7 @@ exit_check(ns_client_t *client) {
376 INSIST(client->recursionquota == NULL);
377 if (client->tcplistener != NULL) {
378 isc_socket_detach(&client->tcplistener);
379-
380- if (client->tcpactive) {
381- LOCK(&client->interface->lock);
382- INSIST(client->interface->ntcpactive > 0);
383- client->interface->ntcpactive--;
384- UNLOCK(&client->interface->lock);
385- client->tcpactive = false;
386- }
387+ mark_tcp_active(client, false);
388 }
389 if (client->udpsocket != NULL) {
390 isc_socket_detach(&client->udpsocket);
391@@ -816,7 +800,7 @@ client_start(isc_task_t *task, isc_event_t *event) {
392 return;
393
394 if (TCP_CLIENT(client)) {
395- if (client->pipelined) {
396+ if (client->tcpconn != NULL) {
397 client_read(client);
398 } else {
399 client_accept(client);
400@@ -2470,6 +2454,7 @@ client_request(isc_task_t *task, isc_event_t *event) {
401 client->nrecvs--;
402 } else {
403 INSIST(TCP_CLIENT(client));
404+ INSIST(client->tcpconn != NULL);
405 REQUIRE(event->ev_type == DNS_EVENT_TCPMSG);
406 REQUIRE(event->ev_sender == &client->tcpmsg);
407 buffer = &client->tcpmsg.buffer;
408@@ -2657,17 +2642,19 @@ client_request(isc_task_t *task, isc_event_t *event) {
409 /*
410 * Pipeline TCP query processing.
411 */
412- if (client->message->opcode != dns_opcode_query) {
413- client->pipelined = false;
414+ if (TCP_CLIENT(client) &&
415+ client->message->opcode != dns_opcode_query)
416+ {
417+ client->tcpconn->pipelined = false;
418 }
419- if (TCP_CLIENT(client) && client->pipelined) {
420+ if (TCP_CLIENT(client) && client->tcpconn->pipelined) {
421 /*
422 * We're pipelining. Replace the client; the
423- * the replacement can read the TCP socket looking
424- * for new messages and this client can process the
425+ * replacement can read the TCP socket looking
426+ * for new messages and this one can process the
427 * current message asynchronously.
428 *
429- * There are now at least three clients using this
430+ * There will now be at least three clients using this
431 * TCP socket - one accepting new connections,
432 * one reading an existing connection to get new
433 * messages, and one answering the message already
434@@ -2675,7 +2662,7 @@ client_request(isc_task_t *task, isc_event_t *event) {
435 */
436 result = ns_client_replace(client);
437 if (result != ISC_R_SUCCESS) {
438- client->pipelined = false;
439+ client->tcpconn->pipelined = false;
440 }
441 }
442
443@@ -3233,10 +3220,7 @@ client_create(ns_clientmgr_t *manager, ns_client_t **clientp) {
444 client->signer = NULL;
445 dns_name_init(&client->signername, NULL);
446 client->mortal = false;
447- client->pipelined = false;
448- client->pipeline_refs = NULL;
449- client->tcpquota = NULL;
450- client->tcpattached = false;
451+ client->tcpconn = NULL;
452 client->recursionquota = NULL;
453 client->interface = NULL;
454 client->peeraddr_valid = false;
455@@ -3341,9 +3325,10 @@ client_read(ns_client_t *client) {
456
457 static void
458 client_newconn(isc_task_t *task, isc_event_t *event) {
459+ isc_result_t result;
460 ns_client_t *client = event->ev_arg;
461 isc_socket_newconnev_t *nevent = (isc_socket_newconnev_t *)event;
462- isc_result_t result;
463+ uint32_t old;
464
465 REQUIRE(event->ev_type == ISC_SOCKEVENT_NEWCONN);
466 REQUIRE(NS_CLIENT_VALID(client));
467@@ -3363,10 +3348,8 @@ client_newconn(isc_task_t *task, isc_event_t *event) {
468 INSIST(client->naccepts == 1);
469 client->naccepts--;
470
471- LOCK(&client->interface->lock);
472- INSIST(client->interface->ntcpaccepting > 0);
473- client->interface->ntcpaccepting--;
474- UNLOCK(&client->interface->lock);
475+ old = isc_atomic_xadd(&client->interface->ntcpaccepting, -1);
476+ INSIST(old > 0);
477
478 /*
479 * We must take ownership of the new socket before the exit
480@@ -3399,7 +3382,7 @@ client_newconn(isc_task_t *task, isc_event_t *event) {
481 NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(3),
482 "accept failed: %s",
483 isc_result_totext(nevent->result));
484- tcpquota_disconnect(client);
485+ tcpconn_detach(client);
486 }
487
488 if (exit_check(client))
489@@ -3437,15 +3420,13 @@ client_newconn(isc_task_t *task, isc_event_t *event) {
490 * telnetting to port 53 (once per CPU) will
491 * deny service to legitimate TCP clients.
492 */
493- client->pipelined = false;
494 result = ns_client_replace(client);
495 if (result == ISC_R_SUCCESS &&
496 (ns_g_server->keepresporder == NULL ||
497 !allowed(&netaddr, NULL, NULL, 0, NULL,
498 ns_g_server->keepresporder)))
499 {
500- pipeline_init(client);
501- client->pipelined = true;
502+ client->tcpconn->pipelined = true;
503 }
504
505 client_read(client);
506@@ -3462,78 +3443,59 @@ client_accept(ns_client_t *client) {
507 CTRACE("accept");
508
509 /*
510- * The tcpquota object can only be simultaneously referenced a
511- * pre-defined number of times; this is configured by 'tcp-clients'
512- * in named.conf. If we can't attach to it here, that means the TCP
513- * client quota has been exceeded.
514+ * Set up a new TCP connection. This means try to attach to the
515+ * TCP client quota (tcp-clients), but fail if we're over quota.
516 */
517- result = isc_quota_attach(&ns_g_server->tcpquota,
518- &client->tcpquota);
519+ result = tcpconn_init(client, false);
520 if (result != ISC_R_SUCCESS) {
521- bool exit;
522+ bool exit;
523
524- ns_client_log(client, NS_LOGCATEGORY_CLIENT,
525- NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(1),
526- "no more TCP clients: %s",
527- isc_result_totext(result));
528-
529- /*
530- * We have exceeded the system-wide TCP client
531- * quota. But, we can't just block this accept
532- * in all cases, because if we did, a heavy TCP
533- * load on other interfaces might cause this
534- * interface to be starved, with no clients able
535- * to accept new connections.
536- *
537- * So, we check here to see if any other clients
538- * are already servicing TCP queries on this
539- * interface (whether accepting, reading, or
540- * processing). If there are at least two
541- * (one reading and one processing a request)
542- * then it's okay *not* to call accept - we
543- * can let this client go inactive and another
544- * one will resume accepting when it's done.
545- *
546- * If there aren't enough active clients on the
547- * interface, then we can be a little bit
548- * flexible about the quota. We'll allow *one*
549- * extra client through to ensure we're listening
550- * on every interface.
551- *
552- * (Note: In practice this means that the real
553- * TCP client quota is tcp-clients plus the
554- * number of listening interfaces plus 2.)
555- */
556- LOCK(&client->interface->lock);
557- exit = (client->interface->ntcpactive > 1);
558- UNLOCK(&client->interface->lock);
559+ ns_client_log(client, NS_LOGCATEGORY_CLIENT,
560+ NS_LOGMODULE_CLIENT, ISC_LOG_WARNING,
561+ "TCP client quota reached: %s",
562+ isc_result_totext(result));
563
564- if (exit) {
565- client->newstate = NS_CLIENTSTATE_INACTIVE;
566- (void)exit_check(client);
567- return;
568- }
569+ /*
570+ * We have exceeded the system-wide TCP client quota. But,
571+ * we can't just block this accept in all cases, because if
572+ * we did, a heavy TCP load on other interfaces might cause
573+ * this interface to be starved, with no clients able to
574+ * accept new connections.
575+ *
576+ * So, we check here to see if any other clients are
577+ * already servicing TCP queries on this interface (whether
578+ * accepting, reading, or processing). If we find at least
579+ * one, then it's okay *not* to call accept - we can let this
580+ * client go inactive and another will take over when it's
581+ * done.
582+ *
583+ * If there aren't enough active clients on the interface,
584+ * then we can be a little bit flexible about the quota.
585+ * We'll allow *one* extra client through to ensure we're
586+ * listening on every interface; we do this by setting the
587+ * 'force' option to tcpconn_init().
588+ *
589+ * (Note: In practice this means that the real TCP client
590+ * quota is tcp-clients plus the number of listening
591+ * interfaces plus 1.)
592+ */
593+ exit = (isc_atomic_xadd(&client->interface->ntcpactive, 0) > 0);
594+ if (exit) {
595+ client->newstate = NS_CLIENTSTATE_INACTIVE;
596+ (void)exit_check(client);
597+ return;
598+ }
599
600- } else {
601- client->tcpattached = true;
602+ result = tcpconn_init(client, true);
603+ RUNTIME_CHECK(result == ISC_R_SUCCESS);
604 }
605
606 /*
607- * By incrementing the interface's ntcpactive counter we signal
608- * that there is at least one client servicing TCP queries for the
609- * interface.
610- *
611- * We also make note of the fact in the client itself with the
612- * tcpactive flag. This ensures proper accounting by preventing
613- * us from accidentally incrementing or decrementing ntcpactive
614- * more than once per client object.
615+ * If this client was set up using get_client() or get_worker(),
616+ * then TCP is already marked active. However, if it was restarted
617+ * from exit_check(), it might not be, so we take care of it now.
618 */
619- if (!client->tcpactive) {
620- LOCK(&client->interface->lock);
621- client->interface->ntcpactive++;
622- UNLOCK(&client->interface->lock);
623- client->tcpactive = true;
624- }
625+ mark_tcp_active(client, true);
626
627 result = isc_socket_accept(client->tcplistener, client->task,
628 client_newconn, client);
629@@ -3549,15 +3511,8 @@ client_accept(ns_client_t *client) {
630 "isc_socket_accept() failed: %s",
631 isc_result_totext(result));
632
633- tcpquota_disconnect(client);
634-
635- if (client->tcpactive) {
636- LOCK(&client->interface->lock);
637- client->interface->ntcpactive--;
638- UNLOCK(&client->interface->lock);
639- client->tcpactive = false;
640- }
641-
642+ tcpconn_detach(client);
643+ mark_tcp_active(client, false);
644 return;
645 }
646
647@@ -3582,9 +3537,7 @@ client_accept(ns_client_t *client) {
648 * listening for connections itself to prevent the interface
649 * going dead.
650 */
651- LOCK(&client->interface->lock);
652- client->interface->ntcpaccepting++;
653- UNLOCK(&client->interface->lock);
654+ isc_atomic_xadd(&client->interface->ntcpaccepting, 1);
655 }
656
657 static void
658@@ -3655,24 +3608,25 @@ ns_client_replace(ns_client_t *client) {
659 REQUIRE(client->manager != NULL);
660
661 tcp = TCP_CLIENT(client);
662- if (tcp && client->pipelined) {
663+ if (tcp && client->tcpconn != NULL && client->tcpconn->pipelined) {
664 result = get_worker(client->manager, client->interface,
665 client->tcpsocket, client);
666 } else {
667 result = get_client(client->manager, client->interface,
668- client->dispatch, client, tcp);
669+ client->dispatch, tcp);
670
671- /*
672- * The responsibility for listening for new requests is hereby
673- * transferred to the new client. Therefore, the old client
674- * should refrain from listening for any more requests.
675- */
676- client->mortal = true;
677 }
678 if (result != ISC_R_SUCCESS) {
679 return (result);
680 }
681
682+ /*
683+ * The responsibility for listening for new requests is hereby
684+ * transferred to the new client. Therefore, the old client
685+ * should refrain from listening for any more requests.
686+ */
687+ client->mortal = true;
688+
689 return (ISC_R_SUCCESS);
690 }
691
692@@ -3806,7 +3760,7 @@ ns_clientmgr_destroy(ns_clientmgr_t **managerp) {
693
694 static isc_result_t
695 get_client(ns_clientmgr_t *manager, ns_interface_t *ifp,
696- dns_dispatch_t *disp, ns_client_t *oldclient, bool tcp)
697+ dns_dispatch_t *disp, bool tcp)
698 {
699 isc_result_t result = ISC_R_SUCCESS;
700 isc_event_t *ev;
701@@ -3850,15 +3804,7 @@ get_client(ns_clientmgr_t *manager, ns_interface_t *ifp,
702 client->dscp = ifp->dscp;
703
704 if (tcp) {
705- client->tcpattached = false;
706- if (oldclient != NULL) {
707- client->tcpattached = oldclient->tcpattached;
708- }
709-
710- LOCK(&client->interface->lock);
711- client->interface->ntcpactive++;
712- UNLOCK(&client->interface->lock);
713- client->tcpactive = true;
714+ mark_tcp_active(client, true);
715
716 client->attributes |= NS_CLIENTATTR_TCP;
717 isc_socket_attach(ifp->tcpsocket,
718@@ -3923,16 +3869,14 @@ get_worker(ns_clientmgr_t *manager, ns_interface_t *ifp, isc_socket_t *sock,
719 ns_interface_attach(ifp, &client->interface);
720 client->newstate = client->state = NS_CLIENTSTATE_WORKING;
721 INSIST(client->recursionquota == NULL);
722- client->tcpquota = &ns_g_server->tcpquota;
723- client->tcpattached = oldclient->tcpattached;
724
725 client->dscp = ifp->dscp;
726
727 client->attributes |= NS_CLIENTATTR_TCP;
728 client->mortal = true;
729
730- pipeline_attach(oldclient, client);
731- client->pipelined = true;
732+ tcpconn_attach(oldclient, client);
733+ mark_tcp_active(client, true);
734
735 isc_socket_attach(ifp->tcpsocket, &client->tcplistener);
736 isc_socket_attach(sock, &client->tcpsocket);
737@@ -3940,11 +3884,6 @@ get_worker(ns_clientmgr_t *manager, ns_interface_t *ifp, isc_socket_t *sock,
738 (void)isc_socket_getpeername(client->tcpsocket, &client->peeraddr);
739 client->peeraddr_valid = true;
740
741- LOCK(&client->interface->lock);
742- client->interface->ntcpactive++;
743- UNLOCK(&client->interface->lock);
744- client->tcpactive = true;
745-
746 INSIST(client->tcpmsg_valid == false);
747 dns_tcpmsg_init(client->mctx, client->tcpsocket, &client->tcpmsg);
748 client->tcpmsg_valid = true;
749@@ -3970,8 +3909,7 @@ ns_clientmgr_createclients(ns_clientmgr_t *manager, unsigned int n,
750 MTRACE("createclients");
751
752 for (disp = 0; disp < n; disp++) {
753- result = get_client(manager, ifp, ifp->udpdispatch[disp],
754- NULL, tcp);
755+ result = get_client(manager, ifp, ifp->udpdispatch[disp], tcp);
756 if (result != ISC_R_SUCCESS)
757 break;
758 }
759diff --git a/bin/named/include/named/client.h b/bin/named/include/named/client.h
760index e2c40acd28..969ee4c08f 100644
761--- a/bin/named/include/named/client.h
762+++ b/bin/named/include/named/client.h
763@@ -78,6 +78,13 @@
764 *** Types
765 ***/
766
767+/*% reference-counted TCP connection object */
768+typedef struct ns_tcpconn {
769+ isc_refcount_t refs;
770+ isc_quota_t *tcpquota;
771+ bool pipelined;
772+} ns_tcpconn_t;
773+
774 /*% nameserver client structure */
775 struct ns_client {
776 unsigned int magic;
777@@ -131,10 +138,7 @@ struct ns_client {
778 dns_name_t signername; /*%< [T]SIG key name */
779 dns_name_t *signer; /*%< NULL if not valid sig */
780 bool mortal; /*%< Die after handling request */
781- bool pipelined; /*%< TCP queries not in sequence */
782- isc_refcount_t *pipeline_refs;
783- isc_quota_t *tcpquota;
784- bool tcpattached;
785+ ns_tcpconn_t *tcpconn;
786 isc_quota_t *recursionquota;
787 ns_interface_t *interface;
788
789diff --git a/bin/named/include/named/interfacemgr.h b/bin/named/include/named/interfacemgr.h
790index 61b08826a6..3535ef22a8 100644
791--- a/bin/named/include/named/interfacemgr.h
792+++ b/bin/named/include/named/interfacemgr.h
793@@ -9,8 +9,6 @@
794 * information regarding copyright ownership.
795 */
796
797-/* $Id: interfacemgr.h,v 1.35 2011/07/28 23:47:58 tbox Exp $ */
798-
799 #ifndef NAMED_INTERFACEMGR_H
800 #define NAMED_INTERFACEMGR_H 1
801
802@@ -77,11 +75,11 @@ struct ns_interface {
803 /*%< UDP dispatchers. */
804 isc_socket_t * tcpsocket; /*%< TCP socket. */
805 isc_dscp_t dscp; /*%< "listen-on" DSCP value */
806- int ntcpaccepting; /*%< Number of clients
807+ int32_t ntcpaccepting; /*%< Number of clients
808 ready to accept new
809 TCP connections on this
810 interface */
811- int ntcpactive; /*%< Number of clients
812+ int32_t ntcpactive; /*%< Number of clients
813 servicing TCP queries
814 (whether accepting or
815 connected) */
816diff --git a/bin/named/interfacemgr.c b/bin/named/interfacemgr.c
817index 955096ef47..d9f6df5802 100644
818--- a/bin/named/interfacemgr.c
819+++ b/bin/named/interfacemgr.c
820@@ -388,6 +388,7 @@ ns_interface_create(ns_interfacemgr_t *mgr, isc_sockaddr_t *addr,
821 */
822 ifp->ntcpaccepting = 0;
823 ifp->ntcpactive = 0;
824+
825 ifp->nudpdispatch = 0;
826
827 ifp->dscp = -1;
828diff --git a/lib/isc/include/isc/quota.h b/lib/isc/include/isc/quota.h
829index b9bf59877a..36c5830242 100644
830--- a/lib/isc/include/isc/quota.h
831+++ b/lib/isc/include/isc/quota.h
832@@ -100,6 +100,13 @@ isc_quota_attach(isc_quota_t *quota, isc_quota_t **p);
833 * quota if successful (ISC_R_SUCCESS or ISC_R_SOFTQUOTA).
834 */
835
836+isc_result_t
837+isc_quota_force(isc_quota_t *quota, isc_quota_t **p);
838+/*%<
839+ * Like isc_quota_attach, but will attach '*p' to the quota
840+ * even if the hard quota has been exceeded.
841+ */
842+
843 void
844 isc_quota_detach(isc_quota_t **p);
845 /*%<
846diff --git a/lib/isc/quota.c b/lib/isc/quota.c
847index 3ddff0d875..556a61f21d 100644
848--- a/lib/isc/quota.c
849+++ b/lib/isc/quota.c
850@@ -74,20 +74,39 @@ isc_quota_release(isc_quota_t *quota) {
851 UNLOCK(&quota->lock);
852 }
853
854-isc_result_t
855-isc_quota_attach(isc_quota_t *quota, isc_quota_t **p)
856-{
857+static isc_result_t
858+doattach(isc_quota_t *quota, isc_quota_t **p, bool force) {
859 isc_result_t result;
860- INSIST(p != NULL && *p == NULL);
861+ REQUIRE(p != NULL && *p == NULL);
862+
863 result = isc_quota_reserve(quota);
864- if (result == ISC_R_SUCCESS || result == ISC_R_SOFTQUOTA)
865+ if (result == ISC_R_SUCCESS || result == ISC_R_SOFTQUOTA) {
866+ *p = quota;
867+ } else if (result == ISC_R_QUOTA && force) {
868+ /* attach anyway */
869+ LOCK(&quota->lock);
870+ quota->used++;
871+ UNLOCK(&quota->lock);
872+
873 *p = quota;
874+ result = ISC_R_SUCCESS;
875+ }
876+
877 return (result);
878 }
879
880+isc_result_t
881+isc_quota_attach(isc_quota_t *quota, isc_quota_t **p) {
882+ return (doattach(quota, p, false));
883+}
884+
885+isc_result_t
886+isc_quota_force(isc_quota_t *quota, isc_quota_t **p) {
887+ return (doattach(quota, p, true));
888+}
889+
890 void
891-isc_quota_detach(isc_quota_t **p)
892-{
893+isc_quota_detach(isc_quota_t **p) {
894 INSIST(p != NULL && *p != NULL);
895 isc_quota_release(*p);
896 *p = NULL;
897diff --git a/lib/isc/win32/libisc.def.in b/lib/isc/win32/libisc.def.in
898index a82facec0f..7b9f23d776 100644
899--- a/lib/isc/win32/libisc.def.in
900+++ b/lib/isc/win32/libisc.def.in
901@@ -519,6 +519,7 @@ isc_portset_removerange
902 isc_quota_attach
903 isc_quota_destroy
904 isc_quota_detach
905+isc_quota_force
906 isc_quota_init
907 isc_quota_max
908 isc_quota_release
909--
9102.20.1
911
diff --git a/meta/recipes-connectivity/bind/bind/0006-restore-allowance-for-tcp-clients-interfaces.patch b/meta/recipes-connectivity/bind/bind/0006-restore-allowance-for-tcp-clients-interfaces.patch
new file mode 100644
index 0000000000..3821d18501
--- /dev/null
+++ b/meta/recipes-connectivity/bind/bind/0006-restore-allowance-for-tcp-clients-interfaces.patch
@@ -0,0 +1,80 @@
1Backport patch to fix CVE-2018-5743.
2
3Ref:
4https://security-tracker.debian.org/tracker/CVE-2018-5743
5
6CVE: CVE-2018-5743
7Upstream-Status: Backport [https://gitlab.isc.org/isc-projects/bind9/commit/59434b9]
8
9Signed-off-by: Kai Kang <kai.kang@windriver.com>
10
11From 59434b987e8eb436b08c24e559ee094c4e939daa Mon Sep 17 00:00:00 2001
12From: Evan Hunt <each@isc.org>
13Date: Fri, 5 Apr 2019 16:26:19 -0700
14Subject: [PATCH 6/6] restore allowance for tcp-clients < interfaces
15
16in the "refactor tcpquota and pipeline refs" commit, the counting
17of active interfaces was tightened in such a way that named could
18fail to listen on an interface if there were more interfaces than
19tcp-clients. when checking the quota to start accepting on an
20interface, if the number of active clients was above zero, then
21it was presumed that some other client was able to handle accepting
22new connections. this, however, ignored the fact that the current client
23could be included in that count, so if the quota was already exceeded
24before all the interfaces were listening, some interfaces would never
25listen.
26
27we now check whether the current client has been marked active; if so,
28then the number of active clients on the interface must be greater
29than 1, not 0.
30
31(cherry picked from commit 0b4e2cd4c3192ba88569dd344f542a8cc43742b5)
32(cherry picked from commit d01023aaac35543daffbdf48464e320150235d41)
33---
34 bin/named/client.c | 8 +++++---
35 doc/arm/Bv9ARM-book.xml | 3 ++-
36 2 files changed, 7 insertions(+), 4 deletions(-)
37
38diff --git a/bin/named/client.c b/bin/named/client.c
39index d826ab32bf..845326abc0 100644
40--- a/bin/named/client.c
41+++ b/bin/named/client.c
42@@ -3464,8 +3464,9 @@ client_accept(ns_client_t *client) {
43 *
44 * So, we check here to see if any other clients are
45 * already servicing TCP queries on this interface (whether
46- * accepting, reading, or processing). If we find at least
47- * one, then it's okay *not* to call accept - we can let this
48+ * accepting, reading, or processing). If we find that at
49+ * least one client other than this one is active, then
50+ * it's okay *not* to call accept - we can let this
51 * client go inactive and another will take over when it's
52 * done.
53 *
54@@ -3479,7 +3480,8 @@ client_accept(ns_client_t *client) {
55 * quota is tcp-clients plus the number of listening
56 * interfaces plus 1.)
57 */
58- exit = (isc_atomic_xadd(&client->interface->ntcpactive, 0) > 0);
59+ exit = (isc_atomic_xadd(&client->interface->ntcpactive, 0) >
60+ (client->tcpactive ? 1 : 0));
61 if (exit) {
62 client->newstate = NS_CLIENTSTATE_INACTIVE;
63 (void)exit_check(client);
64diff --git a/doc/arm/Bv9ARM-book.xml b/doc/arm/Bv9ARM-book.xml
65index 381768d540..9c76d3cd6f 100644
66--- a/doc/arm/Bv9ARM-book.xml
67+++ b/doc/arm/Bv9ARM-book.xml
68@@ -8493,7 +8493,8 @@ avoid-v6-udp-ports { 40000; range 50000 60000; };
69 <para>
70 The number of file descriptors reserved for TCP, stdio,
71 etc. This needs to be big enough to cover the number of
72- interfaces <command>named</command> listens on, <command>tcp-clients</command> as well as
73+ interfaces <command>named</command> listens on plus
74+ <command>tcp-clients</command>, as well as
75 to provide room for outgoing TCP queries and incoming zone
76 transfers. The default is <literal>512</literal>.
77 The minimum value is <literal>128</literal> and the
78--
792.20.1
80
diff --git a/meta/recipes-connectivity/bind/bind/0007-Replace-atomic-operations-in-bin-named-client.c-with.patch b/meta/recipes-connectivity/bind/bind/0007-Replace-atomic-operations-in-bin-named-client.c-with.patch
new file mode 100644
index 0000000000..1a84eca58a
--- /dev/null
+++ b/meta/recipes-connectivity/bind/bind/0007-Replace-atomic-operations-in-bin-named-client.c-with.patch
@@ -0,0 +1,140 @@
1Backport commit to fix compile error on arm caused by commits which are
2to fix CVE-2018-5743.
3
4CVE: CVE-2018-5743
5Upstream-Status: Backport [https://gitlab.isc.org/isc-projects/bind9/commit/ef49780]
6
7Signed-off-by: Kai Kang <kai.kang@windriver.com>
8
9From ef49780d30d3ddc5735cfc32561b678a634fa72f Mon Sep 17 00:00:00 2001
10From: =?UTF-8?q?Ond=C5=99ej=20Sur=C3=BD?= <ondrej@sury.org>
11Date: Wed, 17 Apr 2019 15:22:27 +0200
12Subject: [PATCH] Replace atomic operations in bin/named/client.c with
13 isc_refcount reference counting
14
15---
16 bin/named/client.c | 18 +++++++-----------
17 bin/named/include/named/interfacemgr.h | 5 +++--
18 bin/named/interfacemgr.c | 7 +++++--
19 3 files changed, 15 insertions(+), 15 deletions(-)
20
21diff --git a/bin/named/client.c b/bin/named/client.c
22index 845326abc0..29fecadca8 100644
23--- a/bin/named/client.c
24+++ b/bin/named/client.c
25@@ -402,12 +402,10 @@ tcpconn_detach(ns_client_t *client) {
26 static void
27 mark_tcp_active(ns_client_t *client, bool active) {
28 if (active && !client->tcpactive) {
29- isc_atomic_xadd(&client->interface->ntcpactive, 1);
30+ isc_refcount_increment0(&client->interface->ntcpactive, NULL);
31 client->tcpactive = active;
32 } else if (!active && client->tcpactive) {
33- uint32_t old =
34- isc_atomic_xadd(&client->interface->ntcpactive, -1);
35- INSIST(old > 0);
36+ isc_refcount_decrement(&client->interface->ntcpactive, NULL);
37 client->tcpactive = active;
38 }
39 }
40@@ -554,7 +552,7 @@ exit_check(ns_client_t *client) {
41 if (client->mortal && TCP_CLIENT(client) &&
42 client->newstate != NS_CLIENTSTATE_FREED &&
43 !ns_g_clienttest &&
44- isc_atomic_xadd(&client->interface->ntcpaccepting, 0) == 0)
45+ isc_refcount_current(&client->interface->ntcpaccepting) == 0)
46 {
47 /* Nobody else is accepting */
48 client->mortal = false;
49@@ -3328,7 +3326,6 @@ client_newconn(isc_task_t *task, isc_event_t *event) {
50 isc_result_t result;
51 ns_client_t *client = event->ev_arg;
52 isc_socket_newconnev_t *nevent = (isc_socket_newconnev_t *)event;
53- uint32_t old;
54
55 REQUIRE(event->ev_type == ISC_SOCKEVENT_NEWCONN);
56 REQUIRE(NS_CLIENT_VALID(client));
57@@ -3348,8 +3345,7 @@ client_newconn(isc_task_t *task, isc_event_t *event) {
58 INSIST(client->naccepts == 1);
59 client->naccepts--;
60
61- old = isc_atomic_xadd(&client->interface->ntcpaccepting, -1);
62- INSIST(old > 0);
63+ isc_refcount_decrement(&client->interface->ntcpaccepting, NULL);
64
65 /*
66 * We must take ownership of the new socket before the exit
67@@ -3480,8 +3476,8 @@ client_accept(ns_client_t *client) {
68 * quota is tcp-clients plus the number of listening
69 * interfaces plus 1.)
70 */
71- exit = (isc_atomic_xadd(&client->interface->ntcpactive, 0) >
72- (client->tcpactive ? 1 : 0));
73+ exit = (isc_refcount_current(&client->interface->ntcpactive) >
74+ (client->tcpactive ? 1U : 0U));
75 if (exit) {
76 client->newstate = NS_CLIENTSTATE_INACTIVE;
77 (void)exit_check(client);
78@@ -3539,7 +3535,7 @@ client_accept(ns_client_t *client) {
79 * listening for connections itself to prevent the interface
80 * going dead.
81 */
82- isc_atomic_xadd(&client->interface->ntcpaccepting, 1);
83+ isc_refcount_increment0(&client->interface->ntcpaccepting, NULL);
84 }
85
86 static void
87diff --git a/bin/named/include/named/interfacemgr.h b/bin/named/include/named/interfacemgr.h
88index 3535ef22a8..6e10f210fd 100644
89--- a/bin/named/include/named/interfacemgr.h
90+++ b/bin/named/include/named/interfacemgr.h
91@@ -45,6 +45,7 @@
92 #include <isc/magic.h>
93 #include <isc/mem.h>
94 #include <isc/socket.h>
95+#include <isc/refcount.h>
96
97 #include <dns/result.h>
98
99@@ -75,11 +76,11 @@ struct ns_interface {
100 /*%< UDP dispatchers. */
101 isc_socket_t * tcpsocket; /*%< TCP socket. */
102 isc_dscp_t dscp; /*%< "listen-on" DSCP value */
103- int32_t ntcpaccepting; /*%< Number of clients
104+ isc_refcount_t ntcpaccepting; /*%< Number of clients
105 ready to accept new
106 TCP connections on this
107 interface */
108- int32_t ntcpactive; /*%< Number of clients
109+ isc_refcount_t ntcpactive; /*%< Number of clients
110 servicing TCP queries
111 (whether accepting or
112 connected) */
113diff --git a/bin/named/interfacemgr.c b/bin/named/interfacemgr.c
114index d9f6df5802..135533be6b 100644
115--- a/bin/named/interfacemgr.c
116+++ b/bin/named/interfacemgr.c
117@@ -386,8 +386,8 @@ ns_interface_create(ns_interfacemgr_t *mgr, isc_sockaddr_t *addr,
118 * connections will be handled in parallel even though there is
119 * only one client initially.
120 */
121- ifp->ntcpaccepting = 0;
122- ifp->ntcpactive = 0;
123+ isc_refcount_init(&ifp->ntcpaccepting, 0);
124+ isc_refcount_init(&ifp->ntcpactive, 0);
125
126 ifp->nudpdispatch = 0;
127
128@@ -618,6 +618,9 @@ ns_interface_destroy(ns_interface_t *ifp) {
129
130 ns_interfacemgr_detach(&ifp->mgr);
131
132+ isc_refcount_destroy(&ifp->ntcpactive);
133+ isc_refcount_destroy(&ifp->ntcpaccepting);
134+
135 ifp->magic = 0;
136 isc_mem_put(mctx, ifp, sizeof(*ifp));
137 }
138--
1392.20.1
140
diff --git a/meta/recipes-connectivity/bind/bind_9.11.5-P4.bb b/meta/recipes-connectivity/bind/bind_9.11.5-P4.bb
index 1355841e6b..4fc0f19875 100644
--- a/meta/recipes-connectivity/bind/bind_9.11.5-P4.bb
+++ b/meta/recipes-connectivity/bind/bind_9.11.5-P4.bb
@@ -20,6 +20,14 @@ SRC_URI = "https://ftp.isc.org/isc/bind9/${PV}/${BPN}-${PV}.tar.gz \
20 file://0001-configure.in-remove-useless-L-use_openssl-lib.patch \ 20 file://0001-configure.in-remove-useless-L-use_openssl-lib.patch \
21 file://0001-named-lwresd-V-and-start-log-hide-build-options.patch \ 21 file://0001-named-lwresd-V-and-start-log-hide-build-options.patch \
22 file://0001-avoid-start-failure-with-bind-user.patch \ 22 file://0001-avoid-start-failure-with-bind-user.patch \
23 file://0001-bind-fix-CVE-2019-6471.patch \
24 file://0001-fix-enforcement-of-tcp-clients-v1.patch \
25 file://0002-tcp-clients-could-still-be-exceeded-v2.patch \
26 file://0003-use-reference-counter-for-pipeline-groups-v3.patch \
27 file://0004-better-tcpquota-accounting-and-client-mortality-chec.patch \
28 file://0005-refactor-tcpquota-and-pipeline-refs-allow-special-ca.patch \
29 file://0006-restore-allowance-for-tcp-clients-interfaces.patch \
30 file://0007-Replace-atomic-operations-in-bin-named-client.c-with.patch \
23" 31"
24 32
25SRC_URI[md5sum] = "8ddab4b61fa4516fe404679c74e37960" 33SRC_URI[md5sum] = "8ddab4b61fa4516fe404679c74e37960"
generated by cgit v1.2.3-54-g00ecf (git 2.39.0) at 2024-11-14 17:27:18 +0000