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programmers must manually manage memory in C/C++ and there is no intermediate runtime required for execution, Microsoft refers to code written in these languages as native code Native code provides no protections against memory corruption vulnerabilities such as buffer overflows, integer overflows, and heap overflows The onus is placed on the programmer to prevent these vulnerabilities through secure coding practices Fortunately, many of the protection technologies introduced first in desktop Windows have been ported to Windows Mobile Using these technologies, developers can write more secure code that has a lower chance of being successfully exploited The three main technologies are StrSafeh, IntSafeh, and Stack Cookie protection StrSafeh Many buffer overflows result from mishandling string data during copying, formatting, and concatenation operations Standard string functions such as strcpy, strncpy, strcat, strncat, and sprintf are difficult to use, do not have a standard interface, and fail to provide robust error information Microsoft introduced the StrSafeh string-manipulation library to help developers working with strings by addressing all of these problems StrSafeh is included within the Windows Mobile 6 SDK and defines the following functions: StringXXXCat, StringXXXCatN, StringXXXCopy, StringXXXCopyN, StringXXXGets, StringXXXPrintf, and StringXXXLength In the preceding function definitions, XXX is replaced with either Cch for functions that work with character counts or Cb for functions that require the number of bytes in either the input or output buffer StrSafeh functions always require the size of the destination buffer and always null-terminate the output Additionally, StrSafeh returns detailed status through an HRESULT Using StrSafeh is as simple as including the StrSafeh file in the target project StrSafeh undefines all of the functions it is designed to replace, thus leading to compile errors These errors are eliminated by replacing the dangerous functions, such as strcpy, with their StrSafeh equivalents For more detail and full guidance on how to use StrSafeh, review the Microsoft documentation on MSDN (http://msdnmicrosoftcom/en-us/library/ms647466aspx) IntSafeh Integer overflows are another native code issue that often leads to security vulnerabilities An integer overflow results when two numbers are added or multiplied together and the result exceeds the maximum value that can be represented by the integer type For example, adding 0x0000FFFF to 0xFFFFFFF3 exceeds the maximum value that can be stored in a DWORD When this happens, the calculation overflows and the resulting value will be smaller than the initial value If this overflowed size is used to allocate a buffer, the buffer will be smaller than expected A subsequent buffer overflow could result from this poorly sized buffer The solution for integer overflows.

You re about to learn how to customize your Windows toolkit! Almost every profession requires a set of tools to get the job done Some of these tools are necessary, and some are luxuries If you were a carpenter, you might have a toolbox in which you keep your hammer, saw, screwdrivers, pliers, and so on You could then buy new tools ( I really needed this pneumatic nail gun, and it was on sale! is a common excuse) and add them to your toolbox but you d need to keep it all organized, or risk not being able to nd the tool you need when you need it To help organize all of your PC technician s tools, Microsoft created a handy toolbox: the Microsoft Management Console, or MMC The MMC not only organizes all of those useful tools, but also provides a consistent look and feel between different systems and even different operating systems, which makes it easier to use them

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For details on working with the MMC, refer to the Microsoft Management Console section in 4 of Mike Meyers CompTIA A+ Guide to Managing and Troubleshooting PCs

involves checking every mathematical operation for overflow Although this seems straightforward, several potential problems can occur due to the complexity of C/C++ s type system IntSafeh provides addition, subtraction, multiplication, and conversion functions for performing integer operations safely Use these functions when doing any integer operations with user-supplied data Each function returns an HRESULT value indicating whether the operation succeeded or if an integer overflow occurred For more detail, review the IntSafeh documentation on MSDN (http://msdnmicrosoftcom/en-us/library/ dd361843%28VS85%29aspx) The following sample code shows how to use the DWordAdd function properly:

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