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[2006-09-04 10:34 UTC] domas at mysql dot com
Description:
------------
If function is executed in a prepared statement (like CONCAT,
UNCOMPRESS, etc), it allocates 8192-sized buffer, but fetch()
doesn't check actual length of data. If data crosses 8192-byte
boundary, all sorts of weird stuff starts to happen, including
possible sensitive data disclosures of non-overwrited buffers
(at smaller lengths) or process crashes (at bigger ones).
Reproduce code:
---------------
$db=new mysqli("localhost","root","","test");
$qry=$db->stmt_init();
$qry->prepare("SELECT REPEAT('a',100000)");
$qry->execute();
$qry->bind_result($text);
$qry->fetch();
Expected result:
----------------
silence
Actual result:
--------------
crash!
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#0 0x007c758c in memcpy () from /lib/tls/libc.so.6 #1 0x081b6d91 in _estrndup () #2 0x05698383 in zif_mysqli_stmt_fetch (ht=147132188, return_value=0x8c420bc, return_value_ptr=0x0, this_ptr=0x8c50f1c, return_value_used=0) at /usr/src/redhat/BUILD/php-5.1.6/ext/mysqli/ mysqli_api.c:717 #3 0x081e9a81 in zend_do_fcall_common_helper_SPEC () #4 0x081e93bb in execute () #5 0x081ce2e0 in zend_execute_scripts () #6 0x08192006 in php_execute_script () #7 0x00000000 in ?? ()