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Commit7e95a33

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Fix crashes with CREATE SCHEMA AUTHORIZATION and schema elements
CREATE SCHEMA AUTHORIZATION with appended schema elements can lead tocrashes when comparing the schema name of the query with the schemasused in the qualification of some clauses in the elements' queries.The origin of the problem is that the transformation routine for theelements listed in a CREATE SCHEMA query uses as new, expected, schemaname the one listed in CreateSchemaStmt itself. However, depending onthe query, CreateSchemaStmt.schemaname may be NULL, being computedinstead from the role specification of the query given by theAUTHORIZATION clause, that could be either:- A user name string, with the new schema name being set to the samevalue as the role given.- Guessed from CURRENT_ROLE, SESSION_ROLE or CURRENT_ROLE, with a newschema name computed from the security context where CREATE SCHEMA isrunning.Regression tests are added for CREATE SCHEMA with some appended elements(some of them with schema qualifications), covering also some rolespecification patterns.While on it, this simplifies the context structure used during thetransformation of the elements listed in a CREATE SCHEMA query byremoving the fields for the role specification and the role type. Theywere not used, and for the role specification this could be confusing asthe schema name may by extracted from that at the beginning ofCreateSchemaCommand().This issue exists for a long time, so backpatch down to all the versionssupported.Reported-by: Song HongyuAuthor: Michael PaquierReviewed-by: Richard GuoDiscussion:https://postgr.es/m/17909-f65c12dfc5f0451d@postgresql.orgBackpatch-through: 11
1 parentbe40dd6 commit7e95a33

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7 files changed

+193
-22
lines changed

7 files changed

+193
-22
lines changed

‎src/backend/commands/schemacmds.c

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -178,7 +178,8 @@ CreateSchemaCommand(CreateSchemaStmt *stmt, const char *queryString,
178178
* we cannot, in general, run parse analysis on one statement until we
179179
* have actually executed the prior ones.
180180
*/
181-
parsetree_list=transformCreateSchemaStmt(stmt);
181+
parsetree_list=transformCreateSchemaStmtElements(stmt->schemaElts,
182+
schemaName);
182183

183184
/*
184185
* Execute each command contained in the CREATE SCHEMA. Since the grammar

‎src/backend/parser/parse_utilcmd.c

Lines changed: 19 additions & 19 deletions
Original file line numberDiff line numberDiff line change
@@ -98,12 +98,10 @@ typedef struct
9898
boolofType;/* true if statement contains OF typename */
9999
}CreateStmtContext;
100100

101-
/* State shared bytransformCreateSchemaStmt and its subroutines */
101+
/* State shared bytransformCreateSchemaStmtElements and its subroutines */
102102
typedefstruct
103103
{
104-
constchar*stmtType;/* "CREATE SCHEMA" or "ALTER SCHEMA" */
105-
char*schemaname;/* name of schema */
106-
RoleSpec*authrole;/* owner of schema */
104+
constchar*schemaname;/* name of schema */
107105
List*sequences;/* CREATE SEQUENCE items */
108106
List*tables;/* CREATE TABLE items */
109107
List*views;/* CREATE VIEW items */
@@ -137,7 +135,7 @@ static void transformCheckConstraints(CreateStmtContext *cxt,
137135
staticvoidtransformConstraintAttrs(CreateStmtContext*cxt,
138136
List*constraintList);
139137
staticvoidtransformColumnType(CreateStmtContext*cxt,ColumnDef*column);
140-
staticvoidsetSchemaName(char*context_schema,char**stmt_schema_name);
138+
staticvoidsetSchemaName(constchar*context_schema,char**stmt_schema_name);
141139
staticvoidtransformPartitionCmd(CreateStmtContext*cxt,PartitionCmd*cmd);
142140
staticList*transformPartitionRangeBounds(ParseState*pstate,List*blist,
143141
Relationparent);
@@ -3706,14 +3704,18 @@ transformColumnType(CreateStmtContext *cxt, ColumnDef *column)
37063704

37073705

37083706
/*
3709-
*transformCreateSchemaStmt -
3710-
* analyzes the CREATE SCHEMA statement
3707+
*transformCreateSchemaStmtElements -
3708+
* analyzes theelements of aCREATE SCHEMA statement
37113709
*
3712-
* Split the schema element list into individual commands and place
3713-
* them in the result list in an order such that there are no forward
3714-
* references (e.g. GRANT to a table created later in the list). Note
3715-
* that the logic we use for determining forward references is
3716-
* presently quite incomplete.
3710+
* Split the schema element list from a CREATE SCHEMA statement into
3711+
* individual commands and place them in the result list in an order
3712+
* such that there are no forward references (e.g. GRANT to a table
3713+
* created later in the list). Note that the logic we use for determining
3714+
* forward references is presently quite incomplete.
3715+
*
3716+
* "schemaName" is the name of the schema that will be used for the creation
3717+
* of the objects listed, that may be compiled from the schema name defined
3718+
* in the statement or a role specification.
37173719
*
37183720
* SQL also allows constraints to make forward references, so thumb through
37193721
* the table columns and move forward references to a posterior alter-table
@@ -3729,15 +3731,13 @@ transformColumnType(CreateStmtContext *cxt, ColumnDef *column)
37293731
* extent.
37303732
*/
37313733
List*
3732-
transformCreateSchemaStmt(CreateSchemaStmt*stmt)
3734+
transformCreateSchemaStmtElements(List*schemaElts,constchar*schemaName)
37333735
{
37343736
CreateSchemaStmtContextcxt;
37353737
List*result;
37363738
ListCell*elements;
37373739

3738-
cxt.stmtType="CREATE SCHEMA";
3739-
cxt.schemaname=stmt->schemaname;
3740-
cxt.authrole= (RoleSpec*)stmt->authrole;
3740+
cxt.schemaname=schemaName;
37413741
cxt.sequences=NIL;
37423742
cxt.tables=NIL;
37433743
cxt.views=NIL;
@@ -3749,7 +3749,7 @@ transformCreateSchemaStmt(CreateSchemaStmt *stmt)
37493749
* Run through each schema element in the schema element list. Separate
37503750
* statements by type, and do preliminary analysis.
37513751
*/
3752-
foreach(elements,stmt->schemaElts)
3752+
foreach(elements,schemaElts)
37533753
{
37543754
Node*element=lfirst(elements);
37553755

@@ -3834,10 +3834,10 @@ transformCreateSchemaStmt(CreateSchemaStmt *stmt)
38343834
*Set or check schema name in an element of a CREATE SCHEMA command
38353835
*/
38363836
staticvoid
3837-
setSchemaName(char*context_schema,char**stmt_schema_name)
3837+
setSchemaName(constchar*context_schema,char**stmt_schema_name)
38383838
{
38393839
if (*stmt_schema_name==NULL)
3840-
*stmt_schema_name=context_schema;
3840+
*stmt_schema_name=unconstify(char*,context_schema);
38413841
elseif (strcmp(context_schema,*stmt_schema_name)!=0)
38423842
ereport(ERROR,
38433843
(errcode(ERRCODE_INVALID_SCHEMA_DEFINITION),

‎src/include/parser/parse_utilcmd.h

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -28,7 +28,8 @@ extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
2828
constchar*queryString);
2929
externvoidtransformRuleStmt(RuleStmt*stmt,constchar*queryString,
3030
List**actions,Node**whereClause);
31-
externList*transformCreateSchemaStmt(CreateSchemaStmt*stmt);
31+
externList*transformCreateSchemaStmtElements(List*schemaElts,
32+
constchar*schemaName);
3233
externPartitionBoundSpec*transformPartitionBound(ParseState*pstate,Relationparent,
3334
PartitionBoundSpec*spec);
3435
externList*expandTableLikeClause(RangeVar*heapRel,
Lines changed: 98 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,98 @@
1+
--
2+
-- CREATE_SCHEMA
3+
--
4+
-- Schema creation with elements.
5+
CREATE ROLE regress_create_schema_role SUPERUSER;
6+
-- Cases where schema creation fails as objects are qualified with a schema
7+
-- that does not match with what's expected.
8+
-- This checks all the object types that include schema qualifications.
9+
CREATE SCHEMA AUTHORIZATION regress_create_schema_role
10+
CREATE SEQUENCE schema_not_existing.seq;
11+
ERROR: CREATE specifies a schema (schema_not_existing) different from the one being created (regress_create_schema_role)
12+
CREATE SCHEMA AUTHORIZATION regress_create_schema_role
13+
CREATE TABLE schema_not_existing.tab (id int);
14+
ERROR: CREATE specifies a schema (schema_not_existing) different from the one being created (regress_create_schema_role)
15+
CREATE SCHEMA AUTHORIZATION regress_create_schema_role
16+
CREATE VIEW schema_not_existing.view AS SELECT 1;
17+
ERROR: CREATE specifies a schema (schema_not_existing) different from the one being created (regress_create_schema_role)
18+
CREATE SCHEMA AUTHORIZATION regress_create_schema_role
19+
CREATE INDEX ON schema_not_existing.tab (id);
20+
ERROR: CREATE specifies a schema (schema_not_existing) different from the one being created (regress_create_schema_role)
21+
CREATE SCHEMA AUTHORIZATION regress_create_schema_role
22+
CREATE TRIGGER schema_trig BEFORE INSERT ON schema_not_existing.tab
23+
EXECUTE FUNCTION schema_trig.no_func();
24+
ERROR: CREATE specifies a schema (schema_not_existing) different from the one being created (regress_create_schema_role)
25+
-- Again, with a role specification and no schema names.
26+
SET ROLE regress_create_schema_role;
27+
CREATE SCHEMA AUTHORIZATION CURRENT_USER
28+
CREATE SEQUENCE schema_not_existing.seq;
29+
ERROR: CREATE specifies a schema (schema_not_existing) different from the one being created (regress_create_schema_role)
30+
CREATE SCHEMA AUTHORIZATION CURRENT_USER
31+
CREATE TABLE schema_not_existing.tab (id int);
32+
ERROR: CREATE specifies a schema (schema_not_existing) different from the one being created (regress_create_schema_role)
33+
CREATE SCHEMA AUTHORIZATION CURRENT_USER
34+
CREATE VIEW schema_not_existing.view AS SELECT 1;
35+
ERROR: CREATE specifies a schema (schema_not_existing) different from the one being created (regress_create_schema_role)
36+
CREATE SCHEMA AUTHORIZATION CURRENT_USER
37+
CREATE INDEX ON schema_not_existing.tab (id);
38+
ERROR: CREATE specifies a schema (schema_not_existing) different from the one being created (regress_create_schema_role)
39+
CREATE SCHEMA AUTHORIZATION CURRENT_USER
40+
CREATE TRIGGER schema_trig BEFORE INSERT ON schema_not_existing.tab
41+
EXECUTE FUNCTION schema_trig.no_func();
42+
ERROR: CREATE specifies a schema (schema_not_existing) different from the one being created (regress_create_schema_role)
43+
-- Again, with a schema name and a role specification.
44+
CREATE SCHEMA regress_schema_1 AUTHORIZATION CURRENT_USER
45+
CREATE SEQUENCE schema_not_existing.seq;
46+
ERROR: CREATE specifies a schema (schema_not_existing) different from the one being created (regress_schema_1)
47+
CREATE SCHEMA regress_schema_1 AUTHORIZATION CURRENT_USER
48+
CREATE TABLE schema_not_existing.tab (id int);
49+
ERROR: CREATE specifies a schema (schema_not_existing) different from the one being created (regress_schema_1)
50+
CREATE SCHEMA regress_schema_1 AUTHORIZATION CURRENT_USER
51+
CREATE VIEW schema_not_existing.view AS SELECT 1;
52+
ERROR: CREATE specifies a schema (schema_not_existing) different from the one being created (regress_schema_1)
53+
CREATE SCHEMA regress_schema_1 AUTHORIZATION CURRENT_USER
54+
CREATE INDEX ON schema_not_existing.tab (id);
55+
ERROR: CREATE specifies a schema (schema_not_existing) different from the one being created (regress_schema_1)
56+
CREATE SCHEMA regress_schema_1 AUTHORIZATION CURRENT_USER
57+
CREATE TRIGGER schema_trig BEFORE INSERT ON schema_not_existing.tab
58+
EXECUTE FUNCTION schema_trig.no_func();
59+
ERROR: CREATE specifies a schema (schema_not_existing) different from the one being created (regress_schema_1)
60+
RESET ROLE;
61+
-- Cases where the schema creation succeeds.
62+
-- The schema created matches the role name.
63+
CREATE SCHEMA AUTHORIZATION regress_create_schema_role
64+
CREATE TABLE regress_create_schema_role.tab (id int);
65+
\d regress_create_schema_role.tab
66+
Table "regress_create_schema_role.tab"
67+
Column | Type | Collation | Nullable | Default
68+
--------+---------+-----------+----------+---------
69+
id | integer | | |
70+
71+
DROP SCHEMA regress_create_schema_role CASCADE;
72+
NOTICE: drop cascades to table regress_create_schema_role.tab
73+
-- Again, with a different role specification and no schema names.
74+
SET ROLE regress_create_schema_role;
75+
CREATE SCHEMA AUTHORIZATION CURRENT_USER
76+
CREATE TABLE regress_create_schema_role.tab (id int);
77+
\d regress_create_schema_role.tab
78+
Table "regress_create_schema_role.tab"
79+
Column | Type | Collation | Nullable | Default
80+
--------+---------+-----------+----------+---------
81+
id | integer | | |
82+
83+
DROP SCHEMA regress_create_schema_role CASCADE;
84+
NOTICE: drop cascades to table tab
85+
-- Again, with a schema name and a role specification.
86+
CREATE SCHEMA regress_schema_1 AUTHORIZATION CURRENT_USER
87+
CREATE TABLE regress_schema_1.tab (id int);
88+
\d regress_schema_1.tab
89+
Table "regress_schema_1.tab"
90+
Column | Type | Collation | Nullable | Default
91+
--------+---------+-----------+----------+---------
92+
id | integer | | |
93+
94+
DROP SCHEMA regress_schema_1 CASCADE;
95+
NOTICE: drop cascades to table regress_schema_1.tab
96+
RESET ROLE;
97+
-- Clean up
98+
DROP ROLE regress_create_schema_role;

‎src/test/regress/parallel_schedule

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -48,7 +48,7 @@ test: copy copyselect copydml insert insert_conflict
4848
# ----------
4949
# More groups of parallel tests
5050
# ----------
51-
test: create_misc create_operator create_procedure
51+
test: create_misc create_operator create_procedure create_schema
5252
# These depend on create_misc and create_operator
5353
test: create_index create_index_spgist create_view index_including index_including_gist
5454

‎src/test/regress/serial_schedule

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -63,6 +63,7 @@ test: insert_conflict
6363
test: create_misc
6464
test: create_operator
6565
test: create_procedure
66+
test: create_schema
6667
test: create_index
6768
test: create_index_spgist
6869
test: create_view
Lines changed: 70 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,70 @@
1+
--
2+
-- CREATE_SCHEMA
3+
--
4+
5+
-- Schema creation with elements.
6+
7+
CREATE ROLE regress_create_schema_role SUPERUSER;
8+
9+
-- Cases where schema creation fails as objects are qualified with a schema
10+
-- that does not match with what's expected.
11+
-- This checks all the object types that include schema qualifications.
12+
CREATESCHEMAAUTHORIZATION regress_create_schema_role
13+
CREATESEQUENCEschema_not_existing.seq;
14+
CREATESCHEMAAUTHORIZATION regress_create_schema_role
15+
CREATETABLEschema_not_existing.tab (idint);
16+
CREATESCHEMAAUTHORIZATION regress_create_schema_role
17+
CREATEVIEWschema_not_existing.viewASSELECT1;
18+
CREATESCHEMAAUTHORIZATION regress_create_schema_role
19+
CREATEINDEXONschema_not_existing.tab (id);
20+
CREATESCHEMAAUTHORIZATION regress_create_schema_role
21+
CREATETRIGGERschema_trig BEFORE INSERTONschema_not_existing.tab
22+
EXECUTE FUNCTIONschema_trig.no_func();
23+
-- Again, with a role specification and no schema names.
24+
SET ROLE regress_create_schema_role;
25+
CREATESCHEMAAUTHORIZATIONCURRENT_USER
26+
CREATESEQUENCEschema_not_existing.seq;
27+
CREATESCHEMAAUTHORIZATIONCURRENT_USER
28+
CREATETABLEschema_not_existing.tab (idint);
29+
CREATESCHEMAAUTHORIZATIONCURRENT_USER
30+
CREATEVIEWschema_not_existing.viewASSELECT1;
31+
CREATESCHEMAAUTHORIZATIONCURRENT_USER
32+
CREATEINDEXONschema_not_existing.tab (id);
33+
CREATESCHEMAAUTHORIZATIONCURRENT_USER
34+
CREATETRIGGERschema_trig BEFORE INSERTONschema_not_existing.tab
35+
EXECUTE FUNCTIONschema_trig.no_func();
36+
-- Again, with a schema name and a role specification.
37+
CREATESCHEMAregress_schema_1 AUTHORIZATIONCURRENT_USER
38+
CREATESEQUENCEschema_not_existing.seq;
39+
CREATESCHEMAregress_schema_1 AUTHORIZATIONCURRENT_USER
40+
CREATETABLEschema_not_existing.tab (idint);
41+
CREATESCHEMAregress_schema_1 AUTHORIZATIONCURRENT_USER
42+
CREATEVIEWschema_not_existing.viewASSELECT1;
43+
CREATESCHEMAregress_schema_1 AUTHORIZATIONCURRENT_USER
44+
CREATEINDEXONschema_not_existing.tab (id);
45+
CREATESCHEMAregress_schema_1 AUTHORIZATIONCURRENT_USER
46+
CREATETRIGGERschema_trig BEFORE INSERTONschema_not_existing.tab
47+
EXECUTE FUNCTIONschema_trig.no_func();
48+
RESET ROLE;
49+
50+
-- Cases where the schema creation succeeds.
51+
-- The schema created matches the role name.
52+
CREATESCHEMAAUTHORIZATION regress_create_schema_role
53+
CREATETABLEregress_create_schema_role.tab (idint);
54+
\dregress_create_schema_role.tab
55+
DROPSCHEMA regress_create_schema_role CASCADE;
56+
-- Again, with a different role specification and no schema names.
57+
SET ROLE regress_create_schema_role;
58+
CREATESCHEMAAUTHORIZATIONCURRENT_USER
59+
CREATETABLEregress_create_schema_role.tab (idint);
60+
\dregress_create_schema_role.tab
61+
DROPSCHEMA regress_create_schema_role CASCADE;
62+
-- Again, with a schema name and a role specification.
63+
CREATESCHEMAregress_schema_1 AUTHORIZATIONCURRENT_USER
64+
CREATETABLEregress_schema_1.tab (idint);
65+
\dregress_schema_1.tab
66+
DROPSCHEMA regress_schema_1 CASCADE;
67+
RESET ROLE;
68+
69+
-- Clean up
70+
DROP ROLE regress_create_schema_role;

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