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It is also helpful to have a constantly updated view of the stack that includes both the debugger s interpretation of what s in it and a raw view of its contents Process Information It is very helpful to have detailed process information while debugging There is an endless list of features that could fall into this category, but the most basic ones are a list of the currently loaded executable modules and the currently running threads, along with a stack dump and register dump for each thread Debuggers that contain powerful disassemblers are not common, but the ones that do are usually the best reversing tools you ll find because they provide the best of both worlds.

You get both a highly readable and detailed representation of the code, and you can conveniently step through it and see what the code does at every step, what kind of data it receives as input, and what kind of data it produces as output In modern operating systems debuggers can be roughly divided into two very different flavors: user-mode debuggers and kernel-mode debuggers User-mode.

1.20 logNormal PDF (over ln Ng)

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debuggers are the more conventional debuggers that are typically used by software developers. As the name implies, user-mode debuggers run as normal applications, in user mode, and they can only be used for debugging regular user-mode applications. Kernel-mode debuggers are far more powerful. They allow unlimited control of the target system and provide a full view of everything happening on the system, regardless of whether it is happening inside application code or inside operating system code. The following sections describe the pros and cons of user-mode and kernelmode debuggers and provide an overview on the most popular tools in each category.

n = 10

If you ve ever used a debugger, it was most likely a user-mode debugger. Usermode debuggers are conventional applications that attach to another process (the debugee) and can take full control of it. User-mode debuggers have the advantage of being very easy to set up and use, because they are just another program that s running on the system (unlike kernel-mode debuggers). The downside is that user-mode debuggers can only view a single process and can only view user mode code within that process. Being limited to a single process means that you have to know exactly which process you d like to reverse. This may sound trivial, but sometimes it isn t. For example, sometimes you ll run into programs that have several processes that are somehow interconnected. In such cases, you may not know which process actually runs the code you re interested in. Being restricted to viewing user-mode code is not usually a problem unless the product you re debugging has its own kernel-mode components (such as device drivers). When a program is implemented purely in user mode there s usually no real need to step into operating system code that runs in the kernel. Beyond these limitations, some user-mode debuggers are also unable to debug a program before execution reaches the main executable s entry point (this is typically the .exe file s WinMain callback). This can be a problem in some cases because the system runs a significant amount of user-mode code before that, including calls to the DllMain callback of each DLL that is statically linked to the executable. The following sections present some user-mode debuggers that are well suited for reversing.

0.00 0 20 40 60 80 100 Bearing Capacity Factor (B/L = 1) 120 140

For reversers, OllyDbg, written by Oleh Yuschuk, is probably the best usermode debugger out there (though the selection is admittedly quite small). The

beauty of Olly is that it appears to have been designed from the ground up as a reversing tool, and as such it has a very powerful built-in disassembler I ve seen quite a few beginners attempting their first steps in reversing with complex tools such as Numega SoftICE The fact is that unless you re going to be reversing kernel-mode code, or observing the system globally across multiple processes, there s usually no need for kernel-mode debugging OllyDbg is more than enough OllyDbg s greatest strength is in its disassembler, which provides powerful code-analysis features OllyDbg s code analyzer can identify loops, switch blocks, and other key code structures It shows parameter names for all known functions and APIs, and supports searching for cross-references between code and data in all possible directions.

Figure 15.16 Points at which the bearing capacity is calculated using the point-estimate method with 5 and 10 variables for bearing capacity factor N . (Christian, J. T. and Baecher, G. B., 2002, The Point-Estimate Method with Large Numbers of Variables, International Journal for Numerical and Analytical Methods in Geomechanics, Vol. 126, No. 15, pp. 1515 1529, reproduced by permission of John Wiley & Sons.)

Advice from Paul Goodison:

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