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Overview
| Comment: | If the size of the database according to the header is larger than the actual database file size, report that the database is corrupt. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
8eb1f2443f2712920452b7ed3fb835c7 |
| User & Date: | drh 2010-04-02 12:46:46 |
Context
|
2010-04-02
| ||
| 12:55 | Take care to avoid a buffer over-read when adding a KEYINFO structure to the P4 parameter of an opcode. (check-in: 937b931a user: drh tags: trunk) | |
| 12:46 | If the size of the database according to the header is larger than the actual database file size, report that the database is corrupt. (check-in: 8eb1f244 user: drh tags: trunk) | |
| 03:39 | Pager changes for code coverage testing. (check-in: b04a45ea user: drh tags: trunk) | |
Changes
Changes to src/btree.c.
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**
** SQLITE_OK is returned on success. If the file is not a
** well-formed database file, then SQLITE_CORRUPT is returned.
** SQLITE_BUSY is returned if the database is locked. SQLITE_NOMEM
** is returned if we run out of memory.
*/
static int lockBtree(BtShared *pBt){
int rc;
MemPage *pPage1;
int nPage;
assert( sqlite3_mutex_held(pBt->mutex) );
assert( pBt->pPage1==0 );
rc = sqlite3PagerSharedLock(pBt->pPager);
if( rc!=SQLITE_OK ) return rc;
rc = btreeGetPage(pBt, 1, &pPage1, 0);
if( rc!=SQLITE_OK ) return rc;
/* Do some checking to help insure the file we opened really is
** a valid database file.
*/
nPage = get4byte(28+(u8*)pPage1->aData);
if( nPage==0 ){
rc = sqlite3PagerPagecount(pBt->pPager, &nPage);
/* The sqlite3PagerSharedLock() call above has already determined
** the database file size, so this call to sqlite3PagerPagecount()
** cannot fail. */
if( NEVER(rc) ) goto page1_init_failed;
}
if( nPage>0 ){
int pageSize;
int usableSize;
u8 *page1 = pPage1->aData;
rc = SQLITE_NOTADB;
if( memcmp(page1, zMagicHeader, 16)!=0 ){
................................................................................
releasePage(pPage1);
pBt->usableSize = (u16)usableSize;
pBt->pageSize = (u16)pageSize;
freeTempSpace(pBt);
rc = sqlite3PagerSetPagesize(pBt->pPager, &pBt->pageSize,
pageSize-usableSize);
return rc;
}
if( usableSize<480 ){
goto page1_init_failed;
}
pBt->pageSize = (u16)pageSize;
pBt->usableSize = (u16)usableSize;
#ifndef SQLITE_OMIT_AUTOVACUUM
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**
** SQLITE_OK is returned on success. If the file is not a
** well-formed database file, then SQLITE_CORRUPT is returned.
** SQLITE_BUSY is returned if the database is locked. SQLITE_NOMEM
** is returned if we run out of memory.
*/
static int lockBtree(BtShared *pBt){
int rc; /* Result code from subfunctions */
MemPage *pPage1; /* Page 1 of the database file */
int nPage; /* Number of pages in the database */
int nPageFile = 0; /* Number of pages in the database file */
int nPageHeader; /* Number of pages in the database according to hdr */
assert( sqlite3_mutex_held(pBt->mutex) );
assert( pBt->pPage1==0 );
rc = sqlite3PagerSharedLock(pBt->pPager);
if( rc!=SQLITE_OK ) return rc;
rc = btreeGetPage(pBt, 1, &pPage1, 0);
if( rc!=SQLITE_OK ) return rc;
/* Do some checking to help insure the file we opened really is
** a valid database file.
*/
nPage = nPageHeader = get4byte(28+(u8*)pPage1->aData);
if( (rc = sqlite3PagerPagecount(pBt->pPager, &nPageFile))!=SQLITE_OK ){;
goto page1_init_failed;
}
if( nPage==0 ){
nPage = nPageFile;
}
if( nPage>0 ){
int pageSize;
int usableSize;
u8 *page1 = pPage1->aData;
rc = SQLITE_NOTADB;
if( memcmp(page1, zMagicHeader, 16)!=0 ){
................................................................................
releasePage(pPage1);
pBt->usableSize = (u16)usableSize;
pBt->pageSize = (u16)pageSize;
freeTempSpace(pBt);
rc = sqlite3PagerSetPagesize(pBt->pPager, &pBt->pageSize,
pageSize-usableSize);
return rc;
}
if( nPageHeader>nPageFile ){
rc = SQLITE_CORRUPT_BKPT;
goto page1_init_failed;
}
if( usableSize<480 ){
goto page1_init_failed;
}
pBt->pageSize = (u16)pageSize;
pBt->usableSize = (u16)usableSize;
#ifndef SQLITE_OMIT_AUTOVACUUM
|