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    <p>It is possible to inject a function into another process but it is a little more involved than you think. The first thing is you need the proper length of the function you can do this by creating two functions.</p> <pre><code>static int realFunction() { ... } static void realFunctionEnd() {} </code></pre> <p>Now when you copy the function over you do the length of:</p> <pre><code>realFunctionEnd - realFunction </code></pre> <p>This will give you the size. Now you cannot just call the other functions because as stated they are not guranteed to be at the same address in the other process, but you can assume that , I will assume windows, that kernal32.dll is at the same address so you can actually pass that to the realFunction when you create a remote thread.</p> <p>Now, as to your real issue. What you need to do is to either inject a dll or copy a function over into the other process and then hook the function that you need to change. You can do this by copying another function over and making that code executable and then overwriting the first five bytes of the target function with a jump to your injected code, or you can do a proper detour type hook. In either case it should work. Or, you can find the offset into the function and patch it yourself by writing the proper op codes in place of the real code, such as a return of true.</p> <p>Some kind of injection or patching is required to complete this, you have the basic idea, but there is a little more to it than you think at the moment. I have working code for windows to copy a function into another process, but I believe it is a good learning experience.</p>
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    1. POHow do I change EIP in a different process?
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    1. CODo the functions has to be static? If yes, why? And how am I gonna user the second function as a "ending flag"? Why I can't guarantee that the address won't be the same in the other process? Is there any OS procedure that changes it?
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      1. USPatrick Bassut
    2. COIf I remember correctly the static keeps the functions in order, but again this is not guaranteed as it depends on the compiler, but for VC++ it did. The two functions occur one right after another in memory, being so their addresses are also one right after another. This property along with the fact that a function name is in essence a pointer to an address space you can treat it like a constant unsigned int. An OS may have Address Space Layout Randomization, or it just fails to set the exe image to its preferred base address. You can turn off ASLR, to keep the addresses similar.
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    3. COGot it. About measuring the function's size. Does that apply in any case? Cause when declaring the first function the next space in memory might be filled with something else. Thanks for the help.
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      1. USPatrick Bassut
 

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