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Overview
| Comment: | Ensure that the cell overwrite optimization does not overwrite the header of the b-tree page. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
4cc5694cbd69749c146679c367860952 |
| User & Date: | drh 2019-08-15 13:17:49 |
Context
|
2019-08-15
| ||
| 13:46 | Avoid downgrading SQLITE_CORRUPT errors detected by the schema parser into SQLITE_NOMEM or SQLITE_ERROR errors. check-in: b2e79f8f user: drh tags: trunk | |
| 13:17 | Ensure that the cell overwrite optimization does not overwrite the header of the b-tree page. check-in: 4cc5694c user: drh tags: trunk | |
| 00:04 | Early detection out-of-bounds page numbers on the direct-overflow-read optimization gives consistent error messages regardless of whether or not the optimization is enabled. check-in: b517a52f user: drh tags: trunk | |
Changes
Changes to src/btree.c.
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** This must be done in advance. Once the balance starts, the cell
** offset section of the btree page will be overwritten and we will no
** long be able to find the cells if a pointer to each cell is not saved
** first.
*/
memset(&b.szCell[b.nCell], 0, sizeof(b.szCell[0])*(limit+pOld->nOverflow));
if( pOld->nOverflow>0 ){
if( limit<pOld->aiOvfl[0] ){
rc = SQLITE_CORRUPT_BKPT;
goto balance_cleanup;
}
limit = pOld->aiOvfl[0];
for(j=0; j<limit; j++){
b.apCell[b.nCell] = aData + (maskPage & get2byteAligned(piCell));
piCell += 2;
................................................................................
int nTotal = pX->nData + pX->nZero; /* Total bytes of to write */
int rc; /* Return code */
MemPage *pPage = pCur->pPage; /* Page being written */
BtShared *pBt; /* Btree */
Pgno ovflPgno; /* Next overflow page to write */
u32 ovflPageSize; /* Size to write on overflow page */
if( pCur->info.pPayload + pCur->info.nLocal > pPage->aDataEnd ){
return SQLITE_CORRUPT_BKPT;
}
/* Overwrite the local portion first */
rc = btreeOverwriteContent(pPage, pCur->info.pPayload, pX,
0, pCur->info.nLocal);
if( rc ) return rc;
if( pCur->info.nLocal==nTotal ) return SQLITE_OK;
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>
>
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7671
7672
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7675
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7680
7681
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7684
7685
....
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8473
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8479
8480
8481
8482
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** This must be done in advance. Once the balance starts, the cell
** offset section of the btree page will be overwritten and we will no
** long be able to find the cells if a pointer to each cell is not saved
** first.
*/
memset(&b.szCell[b.nCell], 0, sizeof(b.szCell[0])*(limit+pOld->nOverflow));
if( pOld->nOverflow>0 ){
if( NEVER(limit<pOld->aiOvfl[0]) ){
rc = SQLITE_CORRUPT_BKPT;
goto balance_cleanup;
}
limit = pOld->aiOvfl[0];
for(j=0; j<limit; j++){
b.apCell[b.nCell] = aData + (maskPage & get2byteAligned(piCell));
piCell += 2;
................................................................................
int nTotal = pX->nData + pX->nZero; /* Total bytes of to write */
int rc; /* Return code */
MemPage *pPage = pCur->pPage; /* Page being written */
BtShared *pBt; /* Btree */
Pgno ovflPgno; /* Next overflow page to write */
u32 ovflPageSize; /* Size to write on overflow page */
if( pCur->info.pPayload + pCur->info.nLocal > pPage->aDataEnd
|| pCur->info.pPayload < pPage->aData + pPage->cellOffset
){
return SQLITE_CORRUPT_BKPT;
}
/* Overwrite the local portion first */
rc = btreeOverwriteContent(pPage, pCur->info.pPayload, pX,
0, pCur->info.nLocal);
if( rc ) return rc;
if( pCur->info.nLocal==nTotal ) return SQLITE_OK;
|
Changes to test/fuzzdata8.db.
cannot compute difference between binary files