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remove validator lock

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as every validator function is loop-synchronized, it should no longer be
necessary to use a validator lock.

calling dns_validator_send(), dns_validator_cancel() or
dns_validator_destroy() from a thread other than the one on which the
validator is running will now cause an assertion failure; this should be
fine since the validator and resolver are tightly coupled, and the fetch
contexts and validators run in the same loops.
This commit is contained in:
Evan Hunt
2023-02-16 11:05:39 -08:00
committed by Ondřej Surý
parent 7da99414c0
commit 1ee30be7ce
2 changed files with 7 additions and 36 deletions
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6
lib/dns/include/dns/validator.h
View File

@@ -50,7 +50,6 @@
#include <isc/job.h>
#include <isc/lang.h>
#include <isc/mutex.h>
#include <isc/refcount.h>
#include <dns/fixedname.h>
@@ -73,12 +72,10 @@
* whatever purpose the client desires.
*/
struct dns_validator {
/* Unlocked: */
unsigned int magic;
isc_mutex_t lock;
dns_view_t *view;
isc_loopmgr_t *loopmgr;
uint32_t tid;
isc_refcount_t references;
/* Name and type of the response to be validated. */
@@ -92,7 +89,6 @@ struct dns_validator {
isc_job_cb cb;
void *arg;
/* Locked by 'lock': */
/* Validation options (_DEFER, _NONTA, etc). */
unsigned int options;

37
lib/dns/validator.c
View File

@@ -22,6 +22,7 @@
#include <isc/refcount.h>
#include <isc/result.h>
#include <isc/string.h>
#include <isc/tid.h>
#include <isc/util.h>
#include <dns/client.h>
@@ -378,7 +379,6 @@ fetch_callback_dnskey(void *arg) {
isc_mem_putanddetach(&resp->mctx, resp, sizeof(*resp));
validator_log(val, ISC_LOG_DEBUG(3), "in fetch_callback_dnskey");
LOCK(&val->lock);
fetch = val->fetch;
val->fetch = NULL;
if (CANCELED(val)) {
@@ -428,7 +428,6 @@ fetch_callback_dnskey(void *arg) {
validator_done(val, DNS_R_BROKENCHAIN);
}
}
UNLOCK(&val->lock);
if (fetch != NULL) {
dns_resolver_destroyfetch(&fetch);
@@ -471,7 +470,6 @@ fetch_callback_ds(void *arg) {
}
validator_log(val, ISC_LOG_DEBUG(3), "in fetch_callback_ds");
LOCK(&val->lock);
fetch = val->fetch;
val->fetch = NULL;
@@ -577,7 +575,6 @@ fetch_callback_ds(void *arg) {
done:
isc_mem_putanddetach(&resp->mctx, resp, sizeof(*resp));
UNLOCK(&val->lock);
if (fetch != NULL) {
dns_resolver_destroyfetch(&fetch);
@@ -603,7 +600,6 @@ validator_callback_dnskey(void *arg) {
subvalidator->parent = NULL;
validator_log(val, ISC_LOG_DEBUG(3), "in validator_callback_dnskey");
LOCK(&val->lock);
if (CANCELED(val)) {
validator_done(val, ISC_R_CANCELED);
} else if (eresult == ISC_R_SUCCESS) {
@@ -640,8 +636,6 @@ validator_callback_dnskey(void *arg) {
validator_done(val, DNS_R_BROKENCHAIN);
}
UNLOCK(&val->lock);
dns_validator_destroy(&subvalidator);
dns_validator_detach(&val);
}
@@ -662,7 +656,6 @@ validator_callback_ds(void *arg) {
subvalidator->parent = NULL;
validator_log(val, ISC_LOG_DEBUG(3), "in validator_callback_ds");
LOCK(&val->lock);
if (CANCELED(val)) {
validator_done(val, ISC_R_CANCELED);
} else if (eresult == ISC_R_SUCCESS) {
@@ -699,7 +692,6 @@ validator_callback_ds(void *arg) {
isc_result_totext(eresult));
validator_done(val, DNS_R_BROKENCHAIN);
}
UNLOCK(&val->lock);
dns_validator_destroy(&subvalidator);
dns_validator_detach(&val);
@@ -722,7 +714,6 @@ validator_callback_cname(void *arg) {
val->subvalidator = NULL;
validator_log(val, ISC_LOG_DEBUG(3), "in validator_callback_cname");
LOCK(&val->lock);
if (CANCELED(val)) {
validator_done(val, ISC_R_CANCELED);
} else if (eresult == ISC_R_SUCCESS) {
@@ -742,8 +733,6 @@ validator_callback_cname(void *arg) {
validator_done(val, DNS_R_BROKENCHAIN);
}
UNLOCK(&val->lock);
dns_validator_destroy(&subvalidator);
dns_validator_detach(&val);
}
@@ -766,7 +755,6 @@ validator_callback_nsec(void *arg) {
val->subvalidator = NULL;
validator_log(val, ISC_LOG_DEBUG(3), "in validator_callback_nsec");
LOCK(&val->lock);
if (CANCELED(val)) {
validator_done(val, ISC_R_CANCELED);
} else if (result != ISC_R_SUCCESS) {
@@ -841,8 +829,6 @@ validator_callback_nsec(void *arg) {
}
}
UNLOCK(&val->lock);
dns_validator_destroy(&subvalidator);
dns_validator_detach(&val);
}
@@ -2902,8 +2888,6 @@ validator_start(void *arg) {
validator_log(val, ISC_LOG_DEBUG(3), "starting");
LOCK(&val->lock);
if (val->rdataset != NULL && val->sigrdataset != NULL) {
isc_result_t saved_result;
@@ -2987,8 +2971,6 @@ validator_start(void *arg) {
validator_done(val, result);
}
UNLOCK(&val->lock);
dns_validator_detach(&val);
}
@@ -3007,7 +2989,8 @@ dns_validator_create(dns_view_t *view, dns_name_t *name, dns_rdatatype_t type,
REQUIRE(validatorp != NULL && *validatorp == NULL);
val = isc_mem_get(view->mctx, sizeof(*val));
*val = (dns_validator_t){ .result = ISC_R_FAILURE,
*val = (dns_validator_t){ .tid = isc_tid(),
.result = ISC_R_FAILURE,
.rdataset = rdataset,
.sigrdataset = sigrdataset,
.name = name,
@@ -3024,7 +3007,6 @@ dns_validator_create(dns_view_t *view, dns_name_t *name, dns_rdatatype_t type,
dns_message_attach(message, &val->message);
}
dns_view_attach(view, &val->view);
isc_mutex_init(&val->lock);
result = dns_view_getsecroots(val->view, &val->keytable);
if (result != ISC_R_SUCCESS) {
@@ -3050,7 +3032,6 @@ dns_validator_create(dns_view_t *view, dns_name_t *name, dns_rdatatype_t type,
return (ISC_R_SUCCESS);
cleanup:
isc_mutex_destroy(&val->lock);
if (val->message != NULL) {
dns_message_detach(&val->message);
}
@@ -3063,12 +3044,10 @@ cleanup:
void
dns_validator_send(dns_validator_t *validator) {
REQUIRE(VALID_VALIDATOR(validator));
LOCK(&validator->lock);
REQUIRE(validator->tid == isc_tid());
INSIST((validator->options & DNS_VALIDATOR_DEFER) != 0);
validator->options &= ~DNS_VALIDATOR_DEFER;
UNLOCK(&validator->lock);
dns_validator_ref(validator);
isc_job_run(validator->loopmgr, validator_start, validator);
@@ -3077,8 +3056,7 @@ dns_validator_send(dns_validator_t *validator) {
void
dns_validator_cancel(dns_validator_t *validator) {
REQUIRE(VALID_VALIDATOR(validator));
LOCK(&validator->lock);
REQUIRE(validator->tid == isc_tid());
validator_log(validator, ISC_LOG_DEBUG(3), "dns_validator_cancel");
@@ -3096,7 +3074,6 @@ dns_validator_cancel(dns_validator_t *validator) {
validator->attributes |= VALATTR_CANCELED;
}
UNLOCK(&validator->lock);
}
static void
@@ -3121,7 +3098,6 @@ destroy_validator(dns_validator_t *val) {
if (val->siginfo != NULL) {
isc_mem_put(mctx, val->siginfo, sizeof(*val->siginfo));
}
isc_mutex_destroy(&val->lock);
dns_view_detach(&val->view);
if (val->message != NULL) {
dns_message_detach(&val->message);
@@ -3139,10 +3115,9 @@ dns_validator_destroy(dns_validator_t **validatorp) {
*validatorp = NULL;
REQUIRE(VALID_VALIDATOR(val));
REQUIRE(val->tid == isc_tid());
LOCK(&val->lock);
validator_log(val, ISC_LOG_DEBUG(4), "dns_validator_destroy");
UNLOCK(&val->lock);
dns_validator_detach(&val);
}