RtlInitializeGenericTable in .NET

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From their names alone, you can make some educated guesses about these APIs. It s obvious that this is a group of APIs that manage some kind of a generic list (generic probably meaning that the elements can contain any type of data). There is an API for inserting, deleting, and searching for an element. RtlNumberGenericTableElements probably returns the total number of elements in the list, and RtlGetElementGenericTable most likely allows direct access to an element based on its index. Before you can start using a generic table you most likely need to call RtlInitializeGenericTable to initialize some kind of a root data structure. Generally speaking, reversing sessions start with data we must figure out the key data structures that are managed by the code. Because of this, it would be a good idea to start with RtlInitializeGenericTable, in the hope that it would shed some light on the generic table data structures. As I ve already explained, I will be relying exclusively on offline code analysis, and not on live debugging. If you want to try out the generic table code in a debugger, you can use GenericTable.EXE, which is a little program I have written based on my findings after reversing the generic table API. If you didn t have GenericTable.EXE, you d have to either rely exclusively on a dead listing, or find some other piece of code that uses the generic table. In a quick search I conducted, I was only able to find kernel-mode components that do that (the generic table also has a kernel-mode implementation inside the Windows kernel), but no user-mode components. GenericTable.EXE is available along with its source code on this book s Web site at www.wiley.com/go/eeilam. The following reversing session delves into each of the important functions in the generic table API and demonstrates its inner workings. It should be noted that I will be going a bit farther than I have to, just to demonstrate what can be achieved using advanced reverse-engineering techniques. If this were a real reversing session in which you simply needed the function prototypes in order to make use of the generic table API, you could probably stop a lot sooner, as soon as you had all of those function prototypes. In this session, I will proceed to go after the exact layout of the generic table data structures, but this is only done in order to demonstrate some of the more advanced reversing techniques.
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RtlInitializeGenericTable
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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).
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