Clean up some lack-of-STRICT issues in the core code, too.

A scan for missed proisstrict markings in the core code turned up
these functions:

brin_summarize_new_values
pg_stat_reset_single_table_counters
pg_stat_reset_single_function_counters
pg_create_logical_replication_slot
pg_create_physical_replication_slot
pg_drop_replication_slot

The first three of these take OID, so a null argument will normally look
like a zero to them, resulting in "ERROR: could not open relation with OID
0" for brin_summarize_new_values, and no action for the pg_stat_reset_XXX
functions.  The other three will dump core on a null argument, though this
is mitigated by the fact that they won't do so until after checking that
the caller is superuser or has rolreplication privilege.

In addition, the pg_logical_slot_get/peek[_binary]_changes family was
intentionally marked nonstrict, but failed to make nullness checks on all
the arguments; so again a null-pointer-dereference crash is possible but
only for superusers and rolreplication users.

Add the missing ARGISNULL checks to the latter functions, and mark the
former functions as strict in pg_proc.  Make that change in the back
branches too, even though we can't force initdb there, just so that
installations initdb'd in future won't have the issue.  Since none of these
bugs rise to the level of security issues (and indeed the pg_stat_reset_XXX
functions hardly misbehave at all), it seems sufficient to do this.

In addition, fix some order-of-operations oddities in the slot_get_changes
family, mostly cosmetic, but not the part that moves the function's last
few operations into the PG_TRY block.  As it stood, there was significant
risk for an error to exit without clearing historical information from
the system caches.

The slot_get_changes bugs go back to 9.4 where that code was introduced.
Back-patch appropriate subsets of the pg_proc changes into all active
branches, as well.

diff --git a/src/include/catalog/pg_proc.h b/src/include/catalog/pg_proc.h
index e20e41b112c19eddd1bb893b52b0b5c84b015d12..4b788215ef5d7842623d0ed203e09d04d07adda2 100644 (file)
--- a/src/include/catalog/pg_proc.h
+++ b/src/include/catalog/pg_proc.h
@@ -2661,9 +2661,9 @@ DATA(insert OID = 2274 (  pg_stat_reset                                   PGNSP PGUID 12 1 0 0 f f f f f v 0 0
 DESCR("statistics: reset collected statistics for current database");
 DATA(insert OID = 3775 (  pg_stat_reset_shared                 PGNSP PGUID 12 1 0 0 f f f f f v 1 0 2278 "25" _null_ _null_ _null_ _null_      pg_stat_reset_shared _null_ _null_ _null_ ));
 DESCR("statistics: reset collected statistics shared across the cluster");
-DATA(insert OID = 3776 (  pg_stat_reset_single_table_counters  PGNSP PGUID 12 1 0 0 f f f f f v 1 0 2278 "26" _null_ _null_ _null_ _null_      pg_stat_reset_single_table_counters _null_ _null_ _null_ ));
+DATA(insert OID = 3776 (  pg_stat_reset_single_table_counters  PGNSP PGUID 12 1 0 0 f f f t f v 1 0 2278 "26" _null_ _null_ _null_ _null_      pg_stat_reset_single_table_counters _null_ _null_ _null_ ));
 DESCR("statistics: reset collected statistics for a single table or index in the current database");
-DATA(insert OID = 3777 (  pg_stat_reset_single_function_counters       PGNSP PGUID 12 1 0 0 f f f f f v 1 0 2278 "26" _null_ _null_ _null_ _null_      pg_stat_reset_single_function_counters _null_ _null_ _null_ ));
+DATA(insert OID = 3777 (  pg_stat_reset_single_function_counters       PGNSP PGUID 12 1 0 0 f f f t f v 1 0 2278 "26" _null_ _null_ _null_ _null_      pg_stat_reset_single_function_counters _null_ _null_ _null_ ));
 DESCR("statistics: reset collected statistics for a single function in the current database");
 
 DATA(insert OID = 1946 (  encode                                               PGNSP PGUID 12 1 0 0 f f f t f i 2 0 25 "17 25" _null_ _null_ _null_ _null_ binary_encode _null_ _null_ _null_ ));