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  SQL Server Tips by Burleson

Avoiding buffer overflows

There are no definitive solutions to this problem but it is very important to consider security issues when coding. You should also test and review the code with security concerns in mind.

Here are some ideas:

  • Define limits (bounds) for the size of buffers and never let the size come directly or indirectly from the input.

  • Verify that the limits are not violated before accessing the buffer.

  • Use string and memory functions that require an explicit size limit (for example strncpy instead of strcpy).

  • Use functions that limit the input data size (for example fgets instead of scanf).

  • Use strlen carefully because the terminating NULL might be missing.

  • Be careful with functions that do not NULL terminate the destination string.

  • Use tools to scan for vulnerabilities. E.g.

RATS-source code review tool that understands C, C++, Python, Perl, and PHP.

Splint-tool for statically checking C programs for security vulnerabilities.

ITS4-Static Vulnerability Scanner for C and C++ Code
 

The above book excerpt is from:

Super SQL Server Systems
Turbocharge Database Performance with C++ External Procedures

ISBN: 0-9761573-2-2
Joseph Gama, P. J. Naughter

 http://www.rampant-books.com/book_2005_2_sql_server_external_procedures.htm  

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