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  1. MariaDB Server
  2. MDEV-11902

mi_open race condition

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    • Sprint:
      5.5.55

      Description

      In one created a MyISAM table with DATA_DIRECTORY or INDEX_DIRECTORY attributes (that is, with symlinks) mi_open() and mi_delete() used the pattern of

      • expand all symlinks with realpath()
      • verify that the true path isn't leading into a datadir
      • open (or, accordingly, delete) the file

      This is race condition prone, one can change the symlink after it was expanded by realpath() but before the file is opened.

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              Assignee:
              serg Sergei Golubchik
              Reporter:
              serg Sergei Golubchik
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