The security research group, Last Stage of Delirium, wrote some clean portbinding shellcode for Linux. Clean shellcode is shellcode that does not contain NULL characters. NULL characters, as mentioned earlier, cause most buffer overflow vulnerabilities to not be triggered correctly since the function stops copying when a NULL byte is encountered.

Database System Concepts
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Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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The security research group, Last Stage of Delirium, wrote some clean portbinding shellcode for Linux. Clean shellcode is shellcode that does not contain
NULL characters. NULL characters, as mentioned earlier, cause most buffer
overflow vulnerabilities to not be triggered correctly since the function stops
copying when a NULL byte is encountered.

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