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  1. Moodle
  2. MDL-11237

preg_xxxx() critical bug under PHP 5.2.4, tests required...

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Details

    • Bug
    • Status: Closed
    • Critical
    • Resolution: Fixed
    • 1.7.3, 1.8.3, 1.9
    • 1.7.3, 1.8.3, 1.9
    • Unknown
    • None
    • PHP 5.2.4
    • MOODLE_17_STABLE, MOODLE_18_STABLE, MOODLE_19_STABLE
    • MOODLE_17_STABLE, MOODLE_18_STABLE, MOODLE_19_STABLE

    Description

      I was trying to detect why one MSSQL server was causing a lot of problems with simple SQLs when I've discovered that the root of the problem was that one preg_match_all() function wasn't performing its job under BIG texts.

      I've attached one script (preg_match_all_test.php) that reproduce the problem in my system. Curiously, the limit seems to be 99998 chars. By adding one more char (99999) the function doesn't work properly.

      It's a major problem because it can break tons of things (the mssql_n driver, backup & restore relinking, filters...) potentially anything trying to grep over more than 99998 chars.

      Please, can you execute the script and add your results here? TIA!

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              dougiamas Martin Dougiamas
              stronk7 Eloy Lafuente (stronk7)
              Nobody Nobody
              Amaia Anabitarte, Carlos Escobedo, Ferran Recio, Ilya Tregubov, Laurent David, Raquel Ortega, Sara Arjona (@sarjona)
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              Dates

                Created:
                Updated:
                Resolved:
                11/Oct/07