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The functions standardized as part of ISO C 1999 and their addendums improvedvery little the security options from the previously available library. Thelargest flaw remained that no function asked for the buffer size of destinationbuffers for any function copying data into a user-supplied buffer. According toearlier research we performed, we know that error condition handling was thefirst solution to security vulnerabilities, followed by preconditionvalidation. The standard C functions typically perform little preconditionvalidation and error handling, allowing for a wide range of security issues tobe introduced in their use. ISO/IEC TR 24731, titled as "TR 24731: Safer Clibrary functions", defines 41 new library functions for memory copying, stringhandling (both for normal and wide character strings), time printing, sorting,searching etc. Another innovation it brings is a constraint handlingarchitecture, forcing error handling when certain security-relatedpreconditions are violated when the functions are called. It also specifies thenull-termination of all strings manipulated through its function and introducesa new unsigned integer type that helps preventing integer overflows andunderflows. It is currently implemented by Microsoft as part of their VisualStudio 2005 and above. We examine the architecture of our implementation ofISO/IEC TR 24731. We first introduce our architectural philosophy beforeinforming the reader about the Siemens Four View Model, an architecturalmethodology for the conception of large-scale software systems. Afterwards, weexamine each of the view, as architected for our library. Finally, we concludewith other software engineering matters that were of high importance in thedevelopment of our implementation.

On Implementation of a Safer C Library, ISO/IEC TR 24731