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commit d6b9534dd9dfe2159704b11c9103880cfe89b037 Author: Tom Lane <[email protected]> AuthorDate: Mon Feb 9 10:02:23 2026 -0500 Add a syscache on pg_extension.oid. An upcoming patch requires this cache so that it can track updates in the pg_extension catalog. So far though, the EXTENSIONOID cache only exists in v18 and up (see 490f869d9). We can add it in older branches without an ABI break, if we are careful not to disturb the numbering of existing syscache IDs. In v16 and before, that just requires adding the new ID at the end of the hand-assigned enum list, ignoring our convention about alphabetizing the IDs. But in v17, genbki.pl enforces alphabetical order of the IDs listed in MAKE_SYSCACHE macros. We can fake it out by calling the new cache ZEXTENSIONOID. Note that adding a syscache does change the required contents of the relcache init file (pg_internal.init). But that isn't problematic since we blow those away at postmaster start for other reasons. Author: Tom Lane <[email protected]> Reviewed-by: Noah Misch <[email protected]> Security: CVE-2026-2004 Backpatch-through: 14-17 --- src/backend/utils/cache/syscache.c | 8 ++++++++ src/include/utils/syscache.h | 5 ++++- 2 files changed, 12 insertions(+), 1 deletion(-) diff --git a/src/backend/utils/cache/syscache.c b/src/backend/utils/cache/syscache.c index 65c20bde39e..a8901a957eb 100644 --- a/src/backend/utils/cache/syscache.c +++ b/src/backend/utils/cache/syscache.c @@ -43,6 +43,7 @@ #include "catalog/pg_directory_table.h" #include "catalog/pg_enum.h" #include "catalog/pg_event_trigger.h" +#include "catalog/pg_extension.h" #include "catalog/pg_foreign_data_wrapper.h" #include "catalog/pg_foreign_server.h" #include "catalog/pg_foreign_table.h" @@ -823,6 +824,13 @@ static const struct cachedesc cacheinfo[] = { 0 }, 128 + }, + /* intentionally out of alphabetical order, to avoid an ABI break: */ + [EXTENSIONOID] = { + ExtensionRelationId, + ExtensionOidIndexId, + KEY(Anum_pg_extension_oid), + 2 } }; diff --git a/src/include/utils/syscache.h b/src/include/utils/syscache.h index b0658a94bd9..1d033c664a7 100644 --- a/src/include/utils/syscache.h +++ b/src/include/utils/syscache.h @@ -134,7 +134,10 @@ enum SysCacheIdentifier USERMAPPINGUSERSERVER, ATTENCODINGNUM -#define SysCacheSize (ATTENCODINGNUM + 1) + /* intentionally out of alphabetical order, to avoid an ABI break: */ + EXTENSIONOID + +#define SysCacheSize (EXTENSIONOID + 1) }; extern void InitCatalogCache(void); --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
