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Overview
| Comment: | Improve the sqlite3_result_pointer() interface so that it cannot be faked using sqlite3_result_null() and sqlite3_result_subtype(). |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | pointer-types |
| Files: | files | file ages | folders |
| SHA3-256: |
c13264d5ef0470fb24e09f7bc12f19be |
| User & Date: | drh 2017-07-17 11:39:46 |
Context
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2017-07-17
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| 12:27 | Add the pointer-type parameter to sqlite3_bind_pointer(), sqlite3_result_pointer(), and sqlite3_value_pointer(). The pointer type is a static string that must match (according to strcmp()) or else the pointer is passed as a NULL. This is a security measure to prevent crossing pointers between different extensions. check-in: e1196567fc user: drh tags: branch-3.20 | |
| 11:39 | Improve the sqlite3_result_pointer() interface so that it cannot be faked using sqlite3_result_null() and sqlite3_result_subtype(). Closed-Leaf check-in: c13264d5ef user: drh tags: pointer-types | |
| 00:40 | Add an experimental "pointer type" parameter to sqlite3_bind_pointer(), sqlite3_result_pointer(), and sqlite3_value_pointer(). The pointer type is a string that must compare equal using strcmp() or else the pointer comes through as a NULL. check-in: 211cce04e9 user: drh tags: pointer-types | |
Changes
Changes to src/vdbeapi.c.
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}
unsigned int sqlite3_value_subtype(sqlite3_value *pVal){
Mem *pMem = (Mem*)pVal;
return ((pMem->flags & MEM_Subtype) ? pMem->eSubtype : 0);
}
void *sqlite3_value_pointer(sqlite3_value *pVal, const char *zPType){
Mem *p = (Mem*)pVal;
if( (p->flags & MEM_TypeMask)==(MEM_Null|MEM_Subtype)
&& p->eSubtype=='p'
&& zPType!=0
&& strcmp(p->z, zPType)==0
){
return p->u.pPtr;
}else{
return 0;
|
| |
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}
unsigned int sqlite3_value_subtype(sqlite3_value *pVal){
Mem *pMem = (Mem*)pVal;
return ((pMem->flags & MEM_Subtype) ? pMem->eSubtype : 0);
}
void *sqlite3_value_pointer(sqlite3_value *pVal, const char *zPType){
Mem *p = (Mem*)pVal;
if( p->flags==(MEM_Null|MEM_Subtype|MEM_Term|MEM_Static)
&& p->eSubtype=='p'
&& zPType!=0
&& strcmp(p->z, zPType)==0
){
return p->u.pPtr;
}else{
return 0;
|
Changes to src/vdbemem.c.
708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 |
/*
** Set the value stored in *pMem should already be a NULL.
** Also store a pointer to go with it.
*/
void sqlite3VdbeMemSetPointer(Mem *pMem, void *pPtr, const char *zPType){
assert( pMem->flags==MEM_Null );
if( zPType ){
pMem->flags = MEM_Null|MEM_Subtype;
pMem->u.pPtr = pPtr;
pMem->eSubtype = 'p';
pMem->z = (char*)zPType;
}
}
#ifndef SQLITE_OMIT_FLOATING_POINT
|
| |
708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 |
/*
** Set the value stored in *pMem should already be a NULL.
** Also store a pointer to go with it.
*/
void sqlite3VdbeMemSetPointer(Mem *pMem, void *pPtr, const char *zPType){
assert( pMem->flags==MEM_Null );
if( zPType ){
pMem->flags = MEM_Null|MEM_Subtype|MEM_Term|MEM_Static;
pMem->u.pPtr = pPtr;
pMem->eSubtype = 'p';
pMem->z = (char*)zPType;
}
}
#ifndef SQLITE_OMIT_FLOATING_POINT
|