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  1. MariaDB Server
  2. MDEV-221

memcmp() in filename_to_tablename can read past the end of the input string

    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: Minor
    • Resolution: Fixed
    • Affects Version/s: 5.5.22, 5.5.23
    • Fix Version/s: 5.5.24
    • Component/s: None
    • Labels:
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      Description

      The code in question is

      if (!memcmp(from, tmp_file_prefix, tmp_file_prefix_length))

      The problem here is that 'from' can have length < 4 (=tmp_file_prefix_length), and there might be anything past the end of from, for example another page with unmapped memory

      The problem is found with Windows Application verifier, that tweaks heap allocations in a way that they are places at the end of the page. Quite a lot of innodb tests crash in this function, when mysqld is run under application verifier.

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            • Assignee:
              Unassigned
              Reporter:
              wlad Vladislav Vaintroub
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              Dates

              • Created:
                Updated:
                Resolved: