DOS ain't dead

CRITICAL OFF-by-32-KiB-BUG (Users)

posted by DOS386, 29.03.2013, 11:19

> OK, so to sumarize test conditions:
> * problem is in decompression routine

Right ... there is another problem (also rare and random) with compression too (Page Fault in Ring0) 2011-07-03

> * file must be password protected

Possibly (not yet observed without)

> * file must be quite large

Right

> * decompression must be done many times until error occur

Right

> * bug is not dependent on file content or password (length)?

Most likely. AFAIK 7-ZIP does 2^19 of SHA256 hashes anyway, so any (length) PWD ends up in a 256-bit key

> To test do some repeated decompression, md5sum, comparison...

Right ... like repeatedly throw 4 dices and wait for (6,6,6,6).

> Did you tried under different OSes?

FreeDOS and EDR-DOS.

---
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Complete thread:

• CRITICAL OFF-by-32-KiB-BUG - DOS386, 27.03.2013, 09:10 (Users)
  • CRITICAL OFF-by-32-KiB-BUG - RayeR, 28.03.2013, 02:16
    • CRITICAL OFF-by-32-KiB-BUG - DOS386, 29.03.2013, 09:26
      • CRITICAL OFF-by-32-KiB-BUG - RayeR, 29.03.2013, 11:02
        • CRITICAL OFF-by-32-KiB-BUG - DOS386, 29.03.2013, 11:19
          • CRITICAL OFF-by-32-KiB-BUG (threads) - DOS386, 31.03.2013, 17:42
            • CRITICAL OFF-by-32-KiB-BUG (threads) - RayeR, 03.04.2013, 12:35
              • CRITICAL OFF-by-32-KiB-BUG (threads) - Zyzzle, 04.04.2013, 04:17
                • CRITICAL OFF-by-32-KiB-BUG (threads) - RayeR, 04.04.2013, 13:51
              • CRITICAL OFF-by-32-KiB-BUG (threads) - DOS386, 04.04.2013, 04:37
  • CRITICAL OFF-by-32-KiB-BUG - Rugxulo, 05.04.2013, 19:15
    • CRITICAL OFF-by-32-KiB-BUG | Eric | LZMA2 - DOS386, 10.04.2013, 12:00