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Disallow CREATE STATISTICS on system catalogs

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Add a check that CREATE STATISTICS does not add extended statistics on
system catalogs, similarly to indexes etc.  It can be overriden using
the allow_system_table_mods GUC.

This bug exists since 7b504eb282c, adding the extended statistics, so
backpatch all the way back to PostgreSQL 10.

Author: Tomas Vondra
Reported-by: Dean Rasheed
Backpatch-through: 10
Discussion: https://postgr.es/m/CAEZATCXAPrrOKwEsyZKQ4uzzJQWBCt6QAvOcgqRGdWwT1zb%2BrQ%40mail.gmail.com
This commit is contained in:
Tomas Vondra 2021-01-15 23:24:19 +01:00
parent f44ae4db5f
commit d26d4c717d
3 changed files with 21 additions and 10 deletions
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7
src/backend/commands/statscmds.c
View File

@ -135,6 +135,13 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!pg_class_ownercheck(RelationGetRelid(rel), stxowner))
aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(rel->rd_rel->relkind),
RelationGetRelationName(rel));
/* Creating statistics on system catalogs is not allowed */
if (!allowSystemTableMods && IsSystemRelation(rel))
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("permission denied: \"%s\" is a system catalog",
RelationGetRelationName(rel))));
}
Assert(rel);

12
src/test/regress/expected/stats_ext.out
View File

@ -25,6 +25,7 @@ begin
end;
$$;
-- Verify failures
CREATE TABLE ext_stats_test (x int, y int, z int);
CREATE STATISTICS tst;
ERROR: syntax error at or near ";"
LINE 1: CREATE STATISTICS tst;
@ -39,16 +40,17 @@ LINE 1: CREATE STATISTICS tst FROM sometab;
^
CREATE STATISTICS tst ON a, b FROM nonexistent;
ERROR: relation "nonexistent" does not exist
CREATE STATISTICS tst ON a, b FROM pg_class;
CREATE STATISTICS tst ON a, b FROM ext_stats_test;
ERROR: column "a" does not exist
CREATE STATISTICS tst ON relname, relname, relnatts FROM pg_class;
CREATE STATISTICS tst ON x, x, y FROM ext_stats_test;
ERROR: duplicate column name in statistics definition
CREATE STATISTICS tst ON relnatts + relpages FROM pg_class;
CREATE STATISTICS tst ON x + y FROM ext_stats_test;
ERROR: only simple column references are allowed in CREATE STATISTICS
CREATE STATISTICS tst ON (relpages, reltuples) FROM pg_class;
CREATE STATISTICS tst ON (x, y) FROM ext_stats_test;
ERROR: only simple column references are allowed in CREATE STATISTICS
CREATE STATISTICS tst (unrecognized) ON relname, relnatts FROM pg_class;
CREATE STATISTICS tst (unrecognized) ON x, y FROM ext_stats_test;
ERROR: unrecognized statistics kind "unrecognized"
DROP TABLE ext_stats_test;
-- Ensure stats are dropped sanely, and test IF NOT EXISTS while at it
CREATE TABLE ab1 (a INTEGER, b INTEGER, c INTEGER);
CREATE STATISTICS IF NOT EXISTS ab1_a_b_stats ON a, b FROM ab1;

12
src/test/regress/sql/stats_ext.sql
View File

@ -28,15 +28,17 @@ end;
$$;
-- Verify failures
CREATE TABLE ext_stats_test (x int, y int, z int);
CREATE STATISTICS tst;
CREATE STATISTICS tst ON a, b;
CREATE STATISTICS tst FROM sometab;
CREATE STATISTICS tst ON a, b FROM nonexistent;
CREATE STATISTICS tst ON a, b FROM pg_class;
CREATE STATISTICS tst ON relname, relname, relnatts FROM pg_class;
CREATE STATISTICS tst ON relnatts + relpages FROM pg_class;
CREATE STATISTICS tst ON (relpages, reltuples) FROM pg_class;
CREATE STATISTICS tst (unrecognized) ON relname, relnatts FROM pg_class;
CREATE STATISTICS tst ON a, b FROM ext_stats_test;
CREATE STATISTICS tst ON x, x, y FROM ext_stats_test;
CREATE STATISTICS tst ON x + y FROM ext_stats_test;
CREATE STATISTICS tst ON (x, y) FROM ext_stats_test;
CREATE STATISTICS tst (unrecognized) ON x, y FROM ext_stats_test;
DROP TABLE ext_stats_test;
-- Ensure stats are dropped sanely, and test IF NOT EXISTS while at it
CREATE TABLE ab1 (a INTEGER, b INTEGER, c INTEGER);