7C962554 7C962557 ADD EAX,0C JMP SHORT ntdll.7C96255B in .NET

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7C962554 7C962557 ADD EAX,0C JMP SHORT ntdll.7C96255B
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This code does EAX = EAX + 12, and unconditionally jumps to ntdll. 7C96255B. If you go back to Listing 5.2, you can see that ntdll.7C96255B is right near the end of the function, so the preceding code snippet simply returns EAX + 12 to the caller. Recall that EAX was loaded earlier from the table structure at offset +C, and that while dissecting RtlInitializeGenericTable, you were working under the assumption that offsets +4, +8, and +C are all pointers into the same three-pointer data structure (they were all initialized to point at offset +4). At this point one, of these pointers is incremented by 12 and returned to the caller. This is a powerful hint about the structure of the generic tables. Let s examine the hints one by one:
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You know that there is a group of three pointers starting in offset +4 in the root data structure. You know that each one of these pointers point into another group of three pointers. Initially, they all point to themselves, but you can safely assume that this changes later on when the table is filled.
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You know that RtlGetElementGenericTable is returning the value of one of these pointers to the caller, but not before it is incremented by 12. Note that 12 also happens to be the total size of those three pointers. You have established that RtlGetElementGenericTable takes two parameters and that the first is the table data structure pointer and the second is an index into the table. You can safely assume that it returns the element through the return value.
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All of this leads to one conclusion. RtlGetElementGenericTable is returning a pointer to an element, and adding 12 simply skips the element s header and gets directly to the element s data. It seems very likely that this header is another three-pointer data structure just like that in offset +4 in the root data structure. Furthermore, it would make sense that each of those pointers point to other items with three-pointer headers, just like this one. One other thing you have learned here is that offset +10 is the index of the cached element the same element pointed to by the third pointer, at offset +c. The difference is that +c is a pointer to memory, and offset +10 is an index into the table, which is equivalent to an element number. To me, this is the thrill of reversing one by one gathering pieces of evidence and bringing them together to form partial explanations that slowly evolve into a full understanding of the code. In this particular case, we ve made progress in what is undoubtedly the most important piece of the puzzle: the generic table data structure.
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There is one key element that s been quietly overlooked in all of this: What is the structure of this function Sure, you can treat all of those conditional and unconditional jumps as a bunch of goto instructions and still get away with understanding the flow of relatively simple code. On the other hand, what happens when there are too many of these jumps to the point where it gets hard to keep track of all of them You need to start thinking the code s logic and structure, and the natural place to start is by trying to logically place all of these conditional and unconditional jumps. Remember, the assembly language code you re reversing was generated by a compiler, and the original code was probably written in C. In all likelihood all of this logic originated in neatly organized if-else statements. How do you reconstruct this layout Let s start with the first interesting conditional jump in Listing 5.2 the JE that goes to ntdll.7C962554 (I m ignoring the first two conditions that jump to ntdll.7C962559 because we ve already discussed those). How would you conditionally skip over so much code in a high-level language Simple, the condition tested in the assembly language code is the opposite of what was
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