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Overview
Comment: | Make sure a WAL frame of all zeros is detected as an invalid frame. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA1: |
02d99ad4b51065c67cc7689916130774 |
User & Date: | drh 2010-05-24 13:28:36.000 |
Context
2010-05-24
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13:57 | Change the checksum used in WAL files so that each frames checksum depends on the content of the WAL header and all frame headers and content up to and including the frame to which the checksum is attached. (check-in: 8a53f12c83 user: dan tags: trunk) | |
13:28 | Make sure a WAL frame of all zeros is detected as an invalid frame. (check-in: 02d99ad4b5 user: drh tags: trunk) | |
12:34 | Fix up test_osinst.c to work with SQLITE_OMIT_VIRTUALTABLE. (check-in: 51fd38152b user: drh tags: trunk) | |
Changes
Changes to src/wal.c.
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447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 | 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 | + + + + + + + + - + | Wal *pWal, /* The write-ahead log */ u32 *piPage, /* OUT: Database page number for frame */ u32 *pnTruncate, /* OUT: New db size (or 0 if not commit) */ u8 *aData, /* Pointer to page data (for checksum) */ u8 *aFrame /* Frame data */ ){ int nativeCksum; /* True for native byte-order checksums */ u32 pgno; /* Page number of the frame */ u32 aCksum[2]; assert( WAL_FRAME_HDRSIZE==24 ); /* A frame is only valid if the salt values in the frame-header ** match the salt values in the wal-header. */ if( memcmp(&pWal->hdr.aSalt, &aFrame[8], 8)!=0 ){ return 0; } /* A frame is only valid if the page number is creater than zero. */ pgno = sqlite3Get4byte(&aFrame[0]); if( pgno==0 ){ return 0; } /* A frame is only valid if a checksum of the first 16 bytes ** of the frame-header, and the frame-data matches ** the checksum in the last 8 bytes of the frame-header. */ nativeCksum = (pWal->hdr.bigEndCksum==SQLITE_BIGENDIAN); walChecksumBytes(nativeCksum, aFrame, 16, 0, aCksum); walChecksumBytes(nativeCksum, aData, pWal->szPage, aCksum, aCksum); if( aCksum[0]!=sqlite3Get4byte(&aFrame[16]) || aCksum[1]!=sqlite3Get4byte(&aFrame[20]) ){ /* Checksum failed. */ return 0; } /* If we reach this point, the frame is valid. Return the page number ** and the new database size. */ |
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