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openSUSE:Step:15
bind.29536
bind-CVE-2023-2828.patch
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File bind-CVE-2023-2828.patch of Package bind.29536
Index: bind-9.16.6/lib/dns/rbtdb.c =================================================================== --- bind-9.16.6.orig/lib/dns/rbtdb.c +++ bind-9.16.6/lib/dns/rbtdb.c @@ -574,7 +574,7 @@ static void expire_header(dns_rbtdb_t *rbtdb, rdatasetheader_t *header, bool tree_locked, expire_t reason); static void -overmem_purge(dns_rbtdb_t *rbtdb, unsigned int locknum_start, isc_stdtime_t now, +overmem_purge(dns_rbtdb_t *rbtdb, unsigned int locknum_start, size_t purgesize, bool tree_locked); static isc_result_t resign_insert(dns_rbtdb_t *rbtdb, int idx, rdatasetheader_t *newheader); @@ -6708,6 +6708,16 @@ cleanup: static dns_dbmethods_t zone_methods; +static size_t +rdataset_size(rdatasetheader_t *header) { + if (!NONEXISTENT(header)) { + return (dns_rdataslab_size((unsigned char *)header, + sizeof(*header))); + } + + return (sizeof(*header)); +} + static isc_result_t addrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version, isc_stdtime_t now, dns_rdataset_t *rdataset, unsigned int options, @@ -6862,7 +6872,8 @@ addrdataset(dns_db_t *db, dns_dbnode_t * } if (cache_is_overmem) { - overmem_purge(rbtdb, rbtnode->locknum, now, tree_locked); + overmem_purge(rbtdb, rbtnode->locknum, rdataset_size(newheader), + tree_locked); } NODE_LOCK(&rbtdb->node_locks[rbtnode->locknum].lock, @@ -6881,8 +6892,18 @@ addrdataset(dns_db_t *db, dns_dbnode_t * } header = isc_heap_element(rbtdb->heaps[rbtnode->locknum], 1); - if (header && header->rdh_ttl < now - RBTDB_VIRTUAL) { - expire_header(rbtdb, header, tree_locked, expire_ttl); + if (header != NULL) { + dns_ttl_t rdh_ttl = header->rdh_ttl; + + /* Only account for stale TTL if cache is not overmem */ + if (!cache_is_overmem) { + rdh_ttl += rbtdb->serve_stale_ttl; + } + + if (rdh_ttl < now - RBTDB_VIRTUAL) { + expire_header(rbtdb, header, tree_locked, + expire_ttl); + } } /* @@ -10545,52 +10566,58 @@ update_header(dns_rbtdb_t *rbtdb, rdatas ISC_LIST_PREPEND(rbtdb->rdatasets[header->node->locknum], header, link); } +static size_t +expire_lru_headers(dns_rbtdb_t *rbtdb, unsigned int locknum, size_t purgesize, + bool tree_locked) { + rdatasetheader_t *header, *header_prev; + size_t purged = 0; + + for (header = ISC_LIST_TAIL(rbtdb->rdatasets[locknum]); + header != NULL && purged <= purgesize; header = header_prev) + { + header_prev = ISC_LIST_PREV(header, link); + /* + * Unlink the entry at this point to avoid checking it + * again even if it's currently used someone else and + * cannot be purged at this moment. This entry won't be + * referenced any more (so unlinking is safe) since the + * TTL was reset to 0. + */ + ISC_LIST_UNLINK(rbtdb->rdatasets[locknum], header, link); + size_t header_size = rdataset_size(header); + expire_header(rbtdb, header, tree_locked, expire_lru); + purged += header_size; + } + + return (purged); +} + /*% - * Purge some expired and/or stale (i.e. unused for some period) cache entries - * under an overmem condition. To recover from this condition quickly, up to - * 2 entries will be purged. This process is triggered while adding a new - * entry, and we specifically avoid purging entries in the same LRU bucket as - * the one to which the new entry will belong. Otherwise, we might purge - * entries of the same name of different RR types while adding RRsets from a - * single response (consider the case where we're adding A and AAAA glue records - * of the same NS name). + * Purge some stale (i.e. unused for some period - LRU based cleaning) cache + * entries under the overmem condition. To recover from this condition quickly, + * we cleanup entries up to the size of newly added rdata (passed as purgesize). + * + * This process is triggered while adding a new entry, and we specifically avoid + * purging entries in the same LRU bucket as the one to which the new entry will + * belong. Otherwise, we might purge entries of the same name of different RR + * types while adding RRsets from a single response (consider the case where + * we're adding A and AAAA glue records of the same NS name). */ static void -overmem_purge(dns_rbtdb_t *rbtdb, unsigned int locknum_start, isc_stdtime_t now, +overmem_purge(dns_rbtdb_t *rbtdb, unsigned int locknum_start, size_t purgesize, bool tree_locked) { - rdatasetheader_t *header, *header_prev; unsigned int locknum; - int purgecount = 2; + size_t purged = 0; for (locknum = (locknum_start + 1) % rbtdb->node_lock_count; - locknum != locknum_start && purgecount > 0; + locknum != locknum_start && purged <= purgesize; locknum = (locknum + 1) % rbtdb->node_lock_count) { NODE_LOCK(&rbtdb->node_locks[locknum].lock, isc_rwlocktype_write); - header = isc_heap_element(rbtdb->heaps[locknum], 1); - if (header && header->rdh_ttl < now - RBTDB_VIRTUAL) { - expire_header(rbtdb, header, tree_locked, expire_ttl); - purgecount--; - } - - for (header = ISC_LIST_TAIL(rbtdb->rdatasets[locknum]); - header != NULL && purgecount > 0; header = header_prev) - { - header_prev = ISC_LIST_PREV(header, link); - /* - * Unlink the entry at this point to avoid checking it - * again even if it's currently used someone else and - * cannot be purged at this moment. This entry won't be - * referenced any more (so unlinking is safe) since the - * TTL was reset to 0. - */ - ISC_LIST_UNLINK(rbtdb->rdatasets[locknum], header, - link); - expire_header(rbtdb, header, tree_locked, expire_lru); - purgecount--; - } + purged += expire_lru_headers(rbtdb, locknum, purgesize - purged, + tree_locked); NODE_UNLOCK(&rbtdb->node_locks[locknum].lock, isc_rwlocktype_write);
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