new file mode 100644
@@ -0,0 +1,166 @@
+
+Upstream-Status: Backport [import from debian security.debian.org/debian-security/pool/updates/main/b/bind9/bind9_9.11.5.P4+dfsg-5.1+deb10u9.debian.tar.xz
+Upstream patch https://downloads.isc.org/isc/bind9/9.16.42/patches/0001-CVE-2023-2828.patch]
+Upstream Commit: https://github.com/isc-projects/bind9/commit/da0eafcdee52147e72d407cc3b9f179378ee1d3a
+CVE: CVE-2023-2828
+Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
+
+---
+ lib/dns/rbtdb.c | 106 +++++++++++++++++++++++++++++++++-----------------------
+ 1 file changed, 63 insertions(+), 43 deletions(-)
+
+diff --git a/lib/dns/rbtdb.c b/lib/dns/rbtdb.c
+index b1b928c..3165e26 100644
+--- a/lib/dns/rbtdb.c
++++ b/lib/dns/rbtdb.c
+@@ -792,7 +792,7 @@ static void update_header(dns_rbtdb_t *rbtdb, rdatasetheader_t *header,
+ 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, bool tree_locked);
++ size_t purgesize, bool tree_locked);
+ static isc_result_t resign_insert(dns_rbtdb_t *rbtdb, int idx,
+ rdatasetheader_t *newheader);
+ static void resign_delete(dns_rbtdb_t *rbtdb, rbtdb_version_t *version,
+@@ -6784,6 +6784,16 @@ addclosest(dns_rbtdb_t *rbtdb, rdatasetheader_t *newheader,
+
+ 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,
+@@ -6932,7 +6942,8 @@ addrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
+ }
+
+ 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,
+ isc_rwlocktype_write);
+@@ -6947,9 +6958,14 @@ addrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
+ cleanup_dead_nodes(rbtdb, rbtnode->locknum);
+
+ 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;
++
++ if (rdh_ttl < now - RBTDB_VIRTUAL) {
++ expire_header(rbtdb, header, tree_locked,
++ expire_ttl);
++ }
++ }
+
+ /*
+ * If we've been holding a write lock on the tree just for
+@@ -10388,54 +10404,58 @@ update_header(dns_rbtdb_t *rbtdb, rdatasetheader_t *header,
+ 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, bool tree_locked)
++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);
@@ -22,6 +22,7 @@ SRC_URI = "https://ftp.isc.org/isc/bind9/${PV}/${BPN}-${PV}.tar.gz \
file://CVE-2022-2795.patch \
file://CVE-2022-38177.patch \
file://CVE-2022-38178.patch \
+ file://CVE-2023-2828.patch \
"
SRC_URI[sha256sum] = "0d8efbe7ec166ada90e46add4267b7e7c934790cba9bd5af6b8380a4fbfb5aff"