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As I ve said earlier, the best place to start the investigation of the generic table API is through its data structures. Even though you don t necessarily need to know everything about their layout, getting a general idea regarding their contents might help you figure out the purpose of the API. Having said that, let s start the investigation from a function that (judging from its name) is very likely to provide a few hints regarding those data structures: RtlInitialize GenericTable is a disassembly of RtlInitializeGenericTable, generated by OllyDbg (see Listing 5.1).

T 1/2

7C921A39 7C921A3B 7C921A3C 7C921A3E 7C921A41 7C921A43 7C921A46 7C921A48 7C921A4B 7C921A4D 7C921A50 7C921A53 7C921A56 7C921A59 7C921A5C 7C921A5F 7C921A62 7C921A65 7C921A68 7C921A6B 7C921A6E 7C921A6F

MOV EDI,EDI PUSH EBP MOV EBP,ESP MOV EAX,DWORD XOR EDX,EDX LEA ECX,DWORD MOV DWORD PTR MOV DWORD PTR MOV DWORD PTR MOV DWORD PTR MOV ECX,DWORD MOV DWORD PTR MOV ECX,DWORD MOV DWORD PTR MOV ECX,DWORD MOV DWORD PTR MOV ECX,DWORD MOV DWORD PTR MOV DWORD PTR MOV DWORD PTR POP EBP RET 14

x = dG d = (x x )

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8:30 Porridge for breakfast 10:30 A couple of bananas 11:00 Race 1 followed by a carbohydrate drink (5 8 grams of carbohydrate per 100 ml uid) 12:00 Race 2 followed by a carbohydrate drink (5 8 grams of carbohydrate per 100 ml uid) 13:00 Race 3 followed by a carbohydrate drink 15:00 Return ashore for light pasta/sandwich 18:00 Dinner containing meat and lots of vegetables 20:00 Dinner 2 on a windy regatta

PTR SS:[EBP+8] PTR DS:[EAX+4] DS:[EAX],EDX DS:[ECX+4],ECX DS:[ECX],ECX DS:[EAX+C],ECX PTR SS:[EBP+C] DS:[EAX+18],ECX PTR SS:[EBP+10] DS:[EAX+1C],ECX PTR SS:[EBP+14] DS:[EAX+20],ECX PTR SS:[EBP+18] DS:[EAX+14],EDX DS:[EAX+10],EDX DS:[EAX+24],ECX

= d(G G)

Before attempting to determine what this function does and how it works let s start with the basics: what is the function s calling convention and how many parameters does it take The calling convention is the layout that is used for passing parameters into the function and for defining who is responsible for clearing the stack once the function completes. There are several standard calling conventions, but Windows tends to use stdcall by default. stdcall functions are responsible for clearing their own stack, and they take parameters from the stack in their original left-to-right order (meaning that the caller must push parameters onto the stack in the reverse order). Calling conventions are discussed in depth in Appendix C. In order to answer the questions about the function s calling convention, one basic step you can take is to find the RET instruction that terminates this function. In this particular function, you will quickly notice the RET 14 instruction at the end. This is a RET instruction with a numeric operand, and it provides two important pieces of information. The operand passed to RET tells the processor how many bytes of stack to unwind (in addition to the return value). The very fact that the function is unwinding its own stack tells you that this is not a cdecl function because cdecl functions always let the caller unwind the stack. So, which calling convention is this

5

(16.33) (16.34) (16.35) (16.36) (16.37)

Let s continue this process of elimination in order to determine the function s calling convention and observe that the function isn t taking any registers from the caller because every register that is accessed is initialized within the function itself This shows that this isn t a _fastcall calling convention because _fastcall functions receive parameters through ECX and EDX, and yet these registers are initialized at the very beginning of this function The other common calling conventions are stdcall and the C++ member function calling convention You know that this is not a C++ member function because you have its name from the export directory, and you know that it is undecorated C++ functions are always decorated with the name of their class and the exact type of each parameter they receive.

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