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Now that RSA is over and things are somewhat back to normal, we can get back to the business of talking about Visual Studio features as they relate to the SDL. A classic mistake is forgetting or failing to initialize a member pointer that will be used or freed in the destructor. The following example highlights how a class initialization might fail leaving a member pointer uninitialized.
This code assumes that the allocation will succeed and initialize the p variable. An attacker might influence the size or state of the process forcing a particular failure path to be taken. In this example it would free an uninitialized pointer which can lead to code execution. We have seen different approaches to make this initialization process easier. However the custom operator is not called if the variable is declared locally, as a member of another class not being a pointer or if the class is inherited.
Ensuring a class is always properly initialized can be a challenge, especially for large and complex code bases. In reviewing MSRC cases involving uninitialized class members, we noted that uninitialized pointers are the most common issue that could lead to code execution. Creating an object for the previous example via the following code: This function is responsible for the initialization of class member pointers.
It will also call the compiler-generated class initialization functions of any base classes or member variable of a class type. For our example the A:: In this example the A:: The compiler-generated class initialization function is called as long as: To be initialized by the compiler-generated class initialization function, a member has to respect the following rules: Automated initialization of class member pointers demonstrates the capabilities offered by the compiler to mitigate complex security problems.
Automated initialization of class member pointers In reviewing MSRC cases involving uninitialized class members, we noted that uninitialized pointers are the most common issue that could lead to code execution.