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Overview
| Comment: | Change the way a comparison used to detect corrupt databases in fts3 is done to avoid potential pointer overflow in 32-bit builds. Cherrypick of [95a9a39ff7]. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | branch-3.22 |
| Files: | files | file ages | folders |
| SHA3-256: |
271993803cc99305642e9809cbe81cbe |
| User & Date: | dan 2018-12-24 13:39:13 |
References
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2018-12-26
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| 14:23 | Fix a problem with corrupt fts3 database detection introduced by [27199380]. check-in: ceeb4fba user: dan tags: branch-3.22 | |
Context
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2018-12-26
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| 11:39 | Avoid a left-shift of a negative value (undefined behaviour) when dealing with a corrupt database in fts3. Cherrypick of [b851d12474]. check-in: 2fa63a8b user: dan tags: branch-3.22 | |
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2018-12-24
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| 13:39 | Change the way a comparison used to detect corrupt databases in fts3 is done to avoid potential pointer overflow in 32-bit builds. Cherrypick of [95a9a39ff7]. check-in: 27199380 user: dan tags: branch-3.22 | |
| 13:34 | Change the way a comparison used to detect corrupt databases in fts3 is done to avoid potential pointer overflow in 32-bit builds. check-in: 95a9a39f user: dan tags: trunk | |
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2018-12-19
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| 01:30 | Add extra defenses against strategically corrupt databases to fts3/4. check-in: c255889b user: drh tags: branch-3.22 | |
Changes
Changes to ext/fts3/fts3_write.c.
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pReader->aDoclist = pNext; pReader->pOffsetList = 0; /* Check that the doclist does not appear to extend past the end of the ** b-tree node. And that the final byte of the doclist is 0x00. If either ** of these statements is untrue, then the data structure is corrupt. */ if( (&pReader->aNode[pReader->nNode] - pReader->aDoclist)<pReader->nDoclist || (pReader->nPopulate==0 && pReader->aDoclist[pReader->nDoclist-1]) ){ return FTS_CORRUPT_VTAB; } return SQLITE_OK; } |
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1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 |
pReader->aDoclist = pNext; pReader->pOffsetList = 0; /* Check that the doclist does not appear to extend past the end of the ** b-tree node. And that the final byte of the doclist is 0x00. If either ** of these statements is untrue, then the data structure is corrupt. */ if( pReader->nDoclist-(pReader->aDoclist-pReader->aNode) > pReader->nNode || (pReader->nPopulate==0 && pReader->aDoclist[pReader->nDoclist-1]) ){ return FTS_CORRUPT_VTAB; } return SQLITE_OK; } |