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Overview
| Comment: | Break out the test for writable shadow tables into a separate subroutine. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | defensive-improvements |
| Files: | files | file ages | folders |
| SHA3-256: |
8ad34d36a141fa8f5d9bd784dfeb892c |
| User & Date: | drh 2019-11-16 13:51:31 |
Context
|
2019-11-16
| ||
| 14:15 | Do not allow CREATE TABLE or CREATE VIEW of an object with a name that looks like a shadow table name. Closed-Leaf check-in: 6aef58b6 user: drh tags: defensive-improvements | |
| 13:51 | Break out the test for writable shadow tables into a separate subroutine. check-in: 8ad34d36 user: drh tags: defensive-improvements | |
| 12:04 | Do not allow shadow tables to be dropped in defensive mode. check-in: 70390bbc user: drh tags: trunk | |
Changes
Changes to src/alter.c.
27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 |
** in pParse->zErr (system tables may not be altered) and returns non-zero.
**
** Or, if zName is not a system table, zero is returned.
*/
static int isAlterableTable(Parse *pParse, Table *pTab){
if( 0==sqlite3StrNICmp(pTab->zName, "sqlite_", 7)
#ifndef SQLITE_OMIT_VIRTUALTABLE
|| ( (pTab->tabFlags & TF_Shadow)
&& (pParse->db->flags & SQLITE_Defensive)
&& pParse->db->nVdbeExec==0
)
#endif
){
sqlite3ErrorMsg(pParse, "table %s may not be altered", pTab->zName);
return 1;
}
return 0;
|
| | < |
27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 |
** in pParse->zErr (system tables may not be altered) and returns non-zero.
**
** Or, if zName is not a system table, zero is returned.
*/
static int isAlterableTable(Parse *pParse, Table *pTab){
if( 0==sqlite3StrNICmp(pTab->zName, "sqlite_", 7)
#ifndef SQLITE_OMIT_VIRTUALTABLE
|| ( (pTab->tabFlags & TF_Shadow)!=0
&& sqlite3ReadOnlyShadowTables(pParse->db)
)
#endif
){
sqlite3ErrorMsg(pParse, "table %s may not be altered", pTab->zName);
return 1;
}
return 0;
|
Changes to src/build.c.
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....
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sqlite3VdbeAddOp4(v, OP_VDestroy, iDb, 0, 0, pTab->zName, 0);
sqlite3MayAbort(pParse);
}
sqlite3VdbeAddOp4(v, OP_DropTable, iDb, 0, 0, pTab->zName, 0);
sqlite3ChangeCookie(pParse, iDb);
sqliteViewResetAll(db, iDb);
}
/*
** Return true if it is not allowed to drop the given table
*/
static int tableMayNotBeDropped(Parse *pParse, Table *pTab){
if( sqlite3StrNICmp(pTab->zName, "sqlite_", 7)==0 ){
if( sqlite3StrNICmp(pTab->zName+7, "stat", 4)==0 ) return 0;
if( sqlite3StrNICmp(pTab->zName+7, "parameters", 10)==0 ) return 0;
return 1;
}
if( pTab->tabFlags & TF_Shadow ){
sqlite3 *db = pParse->db;
if( (db->flags & SQLITE_Defensive)!=0 && db->nVdbeExec==0 ) return 1;
}
return 0;
}
/*
** This routine is called to do the work of a DROP TABLE statement.
** pName is the name of the table to be dropped.
................................................................................
goto exit_drop_table;
}
if( sqlite3AuthCheck(pParse, SQLITE_DELETE, pTab->zName, 0, zDb) ){
goto exit_drop_table;
}
}
#endif
if( tableMayNotBeDropped(pParse, pTab) ){
sqlite3ErrorMsg(pParse, "table %s may not be dropped", pTab->zName);
goto exit_drop_table;
}
#ifndef SQLITE_OMIT_VIEW
/* Ensure DROP TABLE is not used on a view, and DROP VIEW is not used
** on a table.
|
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|
sqlite3VdbeAddOp4(v, OP_VDestroy, iDb, 0, 0, pTab->zName, 0);
sqlite3MayAbort(pParse);
}
sqlite3VdbeAddOp4(v, OP_DropTable, iDb, 0, 0, pTab->zName, 0);
sqlite3ChangeCookie(pParse, iDb);
sqliteViewResetAll(db, iDb);
}
/*
** Return TRUE if shadow tables should be read-only in the current
** context.
*/
int sqlite3ReadOnlyShadowTables(sqlite3 *db){
#ifndef SQLITE_OMIT_VIRTUALTABLE
if( (db->flags & SQLITE_Defensive)!=0
&& db->pVtabCtx==0
&& db->nVdbeExec==0
){
return 1;
}
#endif
return 0;
}
/*
** Return true if it is not allowed to drop the given table
*/
static int tableMayNotBeDropped(sqlite3 *db, Table *pTab){
if( sqlite3StrNICmp(pTab->zName, "sqlite_", 7)==0 ){
if( sqlite3StrNICmp(pTab->zName+7, "stat", 4)==0 ) return 0;
if( sqlite3StrNICmp(pTab->zName+7, "parameters", 10)==0 ) return 0;
return 1;
}
if( (pTab->tabFlags & TF_Shadow)!=0 && sqlite3ReadOnlyShadowTables(db) ){
return 1;
}
return 0;
}
/*
** This routine is called to do the work of a DROP TABLE statement.
** pName is the name of the table to be dropped.
................................................................................
goto exit_drop_table;
}
if( sqlite3AuthCheck(pParse, SQLITE_DELETE, pTab->zName, 0, zDb) ){
goto exit_drop_table;
}
}
#endif
if( tableMayNotBeDropped(db, pTab) ){
sqlite3ErrorMsg(pParse, "table %s may not be dropped", pTab->zName);
goto exit_drop_table;
}
#ifndef SQLITE_OMIT_VIEW
/* Ensure DROP TABLE is not used on a view, and DROP VIEW is not used
** on a table.
|
Changes to src/delete.c.
66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 |
}
if( (pTab->tabFlags & (TF_Readonly|TF_Shadow))==0 ) return 0;
db = pParse->db;
if( (pTab->tabFlags & TF_Readonly)!=0 ){
return sqlite3WritableSchema(db)==0 && pParse->nested==0;
}
assert( pTab->tabFlags & TF_Shadow );
return (db->flags & SQLITE_Defensive)!=0
#ifndef SQLITE_OMIT_VIRTUALTABLE
&& db->pVtabCtx==0
#endif
&& db->nVdbeExec==0;
}
/*
** Check to make sure the given table is writable. If it is not
** writable, generate an error message and return 1. If it is
** writable return 0;
*/
|
| < < < < |
66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 |
}
if( (pTab->tabFlags & (TF_Readonly|TF_Shadow))==0 ) return 0;
db = pParse->db;
if( (pTab->tabFlags & TF_Readonly)!=0 ){
return sqlite3WritableSchema(db)==0 && pParse->nested==0;
}
assert( pTab->tabFlags & TF_Shadow );
return sqlite3ReadOnlyShadowTables(db);
}
/*
** Check to make sure the given table is writable. If it is not
** writable, generate an error message and return 1. If it is
** writable return 0;
*/
|
Changes to src/sqliteInt.h.
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const char*,
const sqlite3_module*,
void*,
void(*)(void*)
);
# define sqlite3VtabInSync(db) ((db)->nVTrans>0 && (db)->aVTrans==0)
#endif
int sqlite3VtabEponymousTableInit(Parse*,Module*);
void sqlite3VtabEponymousTableClear(sqlite3*,Module*);
void sqlite3VtabMakeWritable(Parse*,Table*);
void sqlite3VtabBeginParse(Parse*, Token*, Token*, Token*, int);
void sqlite3VtabFinishParse(Parse*, Token*);
void sqlite3VtabArgInit(Parse*);
void sqlite3VtabArgExtend(Parse*, Token*);
|
> |
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const char*,
const sqlite3_module*,
void*,
void(*)(void*)
);
# define sqlite3VtabInSync(db) ((db)->nVTrans>0 && (db)->aVTrans==0)
#endif
int sqlite3ReadOnlyShadowTables(sqlite3 *db);
int sqlite3VtabEponymousTableInit(Parse*,Module*);
void sqlite3VtabEponymousTableClear(sqlite3*,Module*);
void sqlite3VtabMakeWritable(Parse*,Table*);
void sqlite3VtabBeginParse(Parse*, Token*, Token*, Token*, int);
void sqlite3VtabFinishParse(Parse*, Token*);
void sqlite3VtabArgInit(Parse*);
void sqlite3VtabArgExtend(Parse*, Token*);
|