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  1. MariaDB Server
  2. MDEV-40271

@@default_master_connection is corrupted if set to a string with null bytes

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Details

    • Unexpected results

    Description

      SET       @@SESSION.default_master_connection= 'A\0C';
      		 
      SELECT    @@SESSION.default_master_connection , #=> expected: A␀C, actual: A␀␀
      		 
        LENGTHB(@@SESSION.default_master_connection); #=> 3

      Analysis

      Sys_var_session_lexstring tracks a pointer-size pair, but copies the bytes with the null-terminated string function strmake() in ::session_update().
      (Inconsistently, THD::strmake() uses memcpy(), which is a pointer-size function.)

      Sys_var_session_lexstring has been merged away in 11.3 (Commit 6151bde48c); its only instance was @@default_master_connection.

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        Issue Links

          causes

          Bug - A problem which impairs or prevents the functions of the product. MDEV-39757 use-of-uninitialized-value in skip_trailing_space

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-39759 use-of-uninitialized-value in bcmp

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-40270 @@default_master_connection does not convert character sets

          • Major - Major loss of function.
          • In Review
          split from

          Bug - A problem which impairs or prevents the functions of the product. MDEV-39757 use-of-uninitialized-value in skip_trailing_space

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed
          split to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-40272 @@debug_dbug and @@debug_sync accept null bytes

          • Trivial - Cosmetic problem like misspelt words or misaligned text.
          • Open

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            People

              ParadoxV5 Jimmy Hú
              ParadoxV5 Jimmy Hú
              Jimmy Hú Jimmy Hú
              Brandon Nesterenko Brandon Nesterenko
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