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Distance between allocated memory and original address

 
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Smanettone83
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PostPosted: Fri Mar 09, 2012 2:38 pm    Post subject: Distance between allocated memory and original address Reply with quote
Hi guys. I'm tryng to calculate distance from allocated memory and original address for create a jump to code cave.. i've used this code in delphi:

Code:

AllocatedMem:= VirtualAllocEx(ProcHandle, nil, mySize, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
VirtualProtectEx(ProcHandle, AllocatedMem, mySize, PAGE_EXECUTE_READWRITE, nil);


now i've need to use WriteProcessMemory function for write my E9 (jmp) to allocated memory.
Is there a function in delphi that i can use for calculate the distance in byte?

Thanks
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atom0s
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PostPosted: Fri Mar 09, 2012 3:57 pm    Post subject: Reply with quote
(CaveAddr - OriginalAddr) - 5

To calculate the distance.
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Smanettone83
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PostPosted: Fri Mar 09, 2012 4:39 pm    Post subject: Reply with quote
Wiccaan wrote:
(CaveAddr - OriginalAddr) - 5

To calculate the distance.


why - 5 ?
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atom0s
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PostPosted: Fri Mar 09, 2012 5:16 pm    Post subject: Reply with quote
You need to account for the bytes used by your call/jmp.
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Smanettone83
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PostPosted: Sat Mar 10, 2012 8:37 am    Post subject: Reply with quote
Wiccaan wrote:
You need to account for the bytes used by your call/jmp.


example of calculation:

Code:

var
AllocatedMem,Original,JmpToAlloc:int64;
begin
JmpToAlloc:= (AllocatedMem - Original) -5;
WriteProcessMemory(ProcHandle, pointer(AllocatedMem), @MyArray, SizeOf(MyArray), myWrite);
end;


it's right?
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