The CERT C++ Programming Language Secure Coding Standard was developed specifically for versions of the C++ programming language defined byby ISO/IEC 14882-
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2014. Programming Languages
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— C++,
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Fourth Edition,
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2014. Some of the material included in this standard can also be applied to earlier versions of the C++ programming language.
Rules and recommendations included in this CERT C++ Programming Language Secure Coding Standard are designed to be operating system and platform independent. However, the best solutions to secure coding problems are often platform specific. In most cases, this standard provides appropriate compliant solutions for POSIX-compliant and Windows operating systems. In many cases, compliant solutions have also been provided for specific platforms such as Linux or OpenBSD. Occasionally, we also point out implementation-specific behaviors when these behaviors are of interest.
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A secure coding standard for the C++ programming language can create the highest value for the longest period of time by focusing on C++0314. In addition, because considerably more money and effort is devoted to developing new code than maintaining existing code, the highest return on investment comes from influencing programmers who are developing new code [Seacord 03]. Maintaining existing code is still an important concern, however.
The C++ standard documents existing practice where possible. That is, most features must be tested in an implementation before being included in the standard. The CERT C++ secure coding Secure Coding standard has a different purpose. When existing practice serves this purpose, that is fine, but the goal is to create a new set of best practices, and that includes introducing some concepts that are not yet widely known. To put it a different way, the CERT C++ secure coding guidelines are attempting to drive change rather than just document it.
Some vendors have extensions to C++, and some also have implemented only part of the C++ standard before stopping development. Consequently, it is not possible to back up and only discuss C++97 11 or an earlier version of C++. The vendor support equation is too complicated to draw a line and say that a certain compiler supports exactly a certain standard. Whatever demarcation point is selected, different vendors are on opposite sides of it for different parts of the language. Supporting all possibilities would require testing the cross product of each compiler with each language feature. Consequently, we have selected a demarcation point that is the most recent in time, so that the rules and recommendations defined by the standard will be applicable for as long as possible. As a result of the variations in support, source-code portability is enhanced when the programmer uses only the features specified by C++9798. This is one of many trade-offs between security and portability inherent to C++ language programming.
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For all these reasons, the priority of this standard is to support new code development using C++0314. A close-second priority is supporting remediation of old code using C++0314.
This standard does try to make contributions to support older compilers when these contributions can be significant and doing so does not compromise other priorities. The intent is not to capture all deviations from the standard but only a few important ones.
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In general, the CERT secure coding standards try to avoid the inclusion of controversial rules that lack a broad consensus.
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