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bind/bind-9.16-rh2101712.patch
Petr Menšík 889db13e6f fixup! Have dns_zt_apply lock the zone table 
Correct the change to include important locks.
Correct backport issue in statistics rendering fix.

Resolves: rhbz#2126912
2023-02-27 14:44:05 +01:00

217 lines
7.2 KiB
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From b1871274cd2c97b63f3b90d608b7f8936d4ff3c5 Mon Sep 17 00:00:00 2001
From: Mark Andrews <marka@isc.org>
Date: Wed, 24 Aug 2022 12:21:50 +1000
Subject: [PATCH] Have dns_zt_apply lock the zone table
There where a number of places where the zone table should have
been locked, but wasn't, when dns_zt_apply was called.
Added a isc_rwlocktype_t type parameter to dns_zt_apply and adjusted
all calls to using it. Removed locks in callers.
Modified upstream commit for v9_16
---
bin/named/server.c | 12 +++++++-----
bin/named/statschannel.c | 12 +++++++-----
lib/dns/include/dns/zt.h | 3 ++-
lib/dns/tests/zt_test.c | 4 ++--
lib/dns/view.c | 3 ++-
lib/dns/zt.c | 29 ++++++++++++++++++-----------
6 files changed, 38 insertions(+), 25 deletions(-)
diff --git a/bin/named/server.c b/bin/named/server.c
index 860ccae..c2a5887 100644
--- a/bin/named/server.c
+++ b/bin/named/server.c
@@ -9458,7 +9458,8 @@ cleanup:
if (result == ISC_R_SUCCESS && strcmp(view->name, "_bind") != 0)
{
dns_view_setviewrevert(view);
- (void)dns_zt_apply(view->zonetable, false, NULL,
+ (void)dns_zt_apply(view->zonetable,
+ isc_rwlocktype_read, false, NULL,
removed, view);
}
dns_view_detach(&view);
@@ -10901,8 +10902,8 @@ add_view_tolist(struct dumpcontext *dctx, dns_view_t *view) {
ISC_LIST_INIT(vle->zonelist);
ISC_LIST_APPEND(dctx->viewlist, vle, link);
if (dctx->dumpzones) {
- result = dns_zt_apply(view->zonetable, true, NULL,
- add_zone_tolist, dctx);
+ result = dns_zt_apply(view->zonetable, isc_rwlocktype_read,
+ true, NULL, add_zone_tolist, dctx);
}
return (result);
}
@@ -12248,8 +12249,9 @@ named_server_sync(named_server_t *server, isc_lex_t *lex, isc_buffer_t **text) {
for (view = ISC_LIST_HEAD(server->viewlist); view != NULL;
view = ISC_LIST_NEXT(view, link))
{
- result = dns_zt_apply(view->zonetable, false, NULL,
- synczone, &cleanup);
+ result = dns_zt_apply(view->zonetable,
+ isc_rwlocktype_none, false,
+ NULL, synczone, &cleanup);
if (result != ISC_R_SUCCESS && tresult == ISC_R_SUCCESS)
{
tresult = result;
diff --git a/bin/named/statschannel.c b/bin/named/statschannel.c
index 8ff2567..832ce93 100644
--- a/bin/named/statschannel.c
+++ b/bin/named/statschannel.c
@@ -2296,8 +2296,9 @@ generatexml(named_server_t *server, uint32_t flags, int *buflen,
if ((flags & STATS_XML_ZONES) != 0) {
TRY0(xmlTextWriterStartElement(writer,
ISC_XMLCHAR "zones"));
- result = dns_zt_apply(view->zonetable, true, NULL,
- zone_xmlrender, writer);
+ result = dns_zt_apply(view->zonetable,
+ isc_rwlocktype_read, true,
+ NULL, zone_xmlrender, writer);
if (result != ISC_R_SUCCESS) {
goto error;
}
@@ -3069,9 +3070,10 @@ generatejson(named_server_t *server, size_t *msglen, const char **msg,
CHECKMEM(za);
if ((flags & STATS_JSON_ZONES) != 0) {
- result = dns_zt_apply(view->zonetable, true,
- NULL, zone_jsonrender,
- za);
+ result = dns_zt_apply(view->zonetable,
+ isc_rwlocktype_read,
+ true, NULL,
+ zone_jsonrender, za);
if (result != ISC_R_SUCCESS) {
goto error;
}
diff --git a/lib/dns/include/dns/zt.h b/lib/dns/include/dns/zt.h
index 4a1b263..1c6c789 100644
--- a/lib/dns/include/dns/zt.h
+++ b/lib/dns/include/dns/zt.h
@@ -168,7 +168,8 @@ dns_zt_freezezones(dns_zt_t *zt, dns_view_t *view, bool freeze);
*/
isc_result_t
-dns_zt_apply(dns_zt_t *zt, bool stop, isc_result_t *sub,
+dns_zt_apply(dns_zt_t *zt, isc_rwlocktype_t lock, bool stop,
+ isc_result_t *sub,
isc_result_t (*action)(dns_zone_t *, void *), void *uap);
/*%<
* Apply a given 'action' to all zone zones in the table.
diff --git a/lib/dns/tests/zt_test.c b/lib/dns/tests/zt_test.c
index 7945a0b..bfacb94 100644
--- a/lib/dns/tests/zt_test.c
+++ b/lib/dns/tests/zt_test.c
@@ -136,8 +136,8 @@ apply(void **state) {
assert_non_null(view->zonetable);
assert_int_equal(nzones, 0);
- result = dns_zt_apply(view->zonetable, false, NULL, count_zone,
- &nzones);
+ result = dns_zt_apply(view->zonetable, isc_rwlocktype_read, false,
+ NULL, count_zone, &nzones);
assert_int_equal(result, ISC_R_SUCCESS);
assert_int_equal(nzones, 1);
diff --git a/lib/dns/view.c b/lib/dns/view.c
index 8c7e40a..dcb0f18 100644
--- a/lib/dns/view.c
+++ b/lib/dns/view.c
@@ -704,7 +704,8 @@ dns_view_dialup(dns_view_t *view) {
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(view->zonetable != NULL);
- (void)dns_zt_apply(view->zonetable, false, NULL, dialup, NULL);
+ (void)dns_zt_apply(view->zonetable, isc_rwlocktype_read, false,
+ NULL, dialup, NULL);
}
void
diff --git a/lib/dns/zt.c b/lib/dns/zt.c
index 8ca9cd6..1bfc308 100644
--- a/lib/dns/zt.c
+++ b/lib/dns/zt.c
@@ -223,7 +223,8 @@ flush(dns_zone_t *zone, void *uap) {
static void
zt_destroy(dns_zt_t *zt) {
if (atomic_load_acquire(&zt->flush)) {
- (void)dns_zt_apply(zt, false, NULL, flush, NULL);
+ (void)dns_zt_apply(zt, isc_rwlocktype_none, false, NULL,
+ flush, NULL);
}
dns_rbt_destroy(&zt->table);
isc_rwlock_destroy(&zt->rwlock);
@@ -265,9 +266,8 @@ dns_zt_load(dns_zt_t *zt, bool stop, bool newonly) {
struct zt_load_params params;
REQUIRE(VALID_ZT(zt));
params.newonly = newonly;
- RWLOCK(&zt->rwlock, isc_rwlocktype_read);
- result = dns_zt_apply(zt, stop, NULL, load, &params);
- RWUNLOCK(&zt->rwlock, isc_rwlocktype_read);
+ result = dns_zt_apply(zt, isc_rwlocktype_read, stop, NULL, load,
+ &params);
return (result);
}
@@ -338,9 +338,8 @@ dns_zt_asyncload(dns_zt_t *zt, bool newonly, dns_zt_allloaded_t alldone,
zt->loaddone = alldone;
zt->loaddone_arg = arg;
- RWLOCK(&zt->rwlock, isc_rwlocktype_read);
- result = dns_zt_apply(zt, false, NULL, asyncload, zt);
- RWUNLOCK(&zt->rwlock, isc_rwlocktype_read);
+ result = dns_zt_apply(zt, isc_rwlocktype_read, false, NULL,
+ asyncload, zt);
/*
* Have all the loads completed?
@@ -386,9 +385,8 @@ dns_zt_freezezones(dns_zt_t *zt, dns_view_t *view, bool freeze) {
REQUIRE(VALID_ZT(zt));
- RWLOCK(&zt->rwlock, isc_rwlocktype_read);
- result = dns_zt_apply(zt, false, &tresult, freezezones, &params);
- RWUNLOCK(&zt->rwlock, isc_rwlocktype_read);
+ result = dns_zt_apply(zt, isc_rwlocktype_read, false, &tresult,
+ freezezones, &params);
if (tresult == ISC_R_NOTFOUND) {
tresult = ISC_R_SUCCESS;
}
@@ -522,7 +520,8 @@ dns_zt_setviewrevert(dns_zt_t *zt) {
}
isc_result_t
-dns_zt_apply(dns_zt_t *zt, bool stop, isc_result_t *sub,
+dns_zt_apply(dns_zt_t *zt, isc_rwlocktype_t lock, bool stop,
+ isc_result_t *sub,
isc_result_t (*action)(dns_zone_t *, void *), void *uap) {
dns_rbtnode_t *node;
dns_rbtnodechain_t chain;
@@ -532,6 +531,10 @@ dns_zt_apply(dns_zt_t *zt, bool stop, isc_result_t *sub,
REQUIRE(VALID_ZT(zt));
REQUIRE(action != NULL);
+ if (lock != isc_rwlocktype_none) {
+ RWLOCK(&zt->rwlock, lock);
+ }
+
dns_rbtnodechain_init(&chain);
result = dns_rbtnodechain_first(&chain, zt->table, NULL, NULL);
if (result == ISC_R_NOTFOUND) {
@@ -568,6 +571,10 @@ cleanup:
*sub = tresult;
}
+ if (lock != isc_rwlocktype_none) {
+ RWUNLOCK(&zt->rwlock, lock);
+ }
+
return (result);
}
--
2.39.2
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