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Buffer Overflow Exploitation
Overview
Every program is first read into the memory and place on some address (say 00000000). When OS reads the executable file it stores it into the process memory and all its required Dll’s and their nested dll’s as well. Every dll has its own data and code segment but they share the same stack. No process can access memory of other processes. If this is highly necessary then these processes take help from special API calls to access other processes memory. While loading executable and dlls every process in 32 bit mode believes that there is 4GB RAM available. But this is not so on most of the systems. So while loading the program the process may create some logical addresses which are not present physically, and when those addresses are somehow accessed the program throws an exception.
Whenever a dll is created in C/C++ a compiler automatically assigns it an image base address (00400000) whenever that dll is required in any program OS tries to load that dll to its image base address, if there is a conflict of address with any other dll then the OS automatically assigns it another address and refactors the program for the new address.
A linker is a computer program which takes object files produced by Compiler. It analyses those files and where ever any cross reference is required it adds that cross reference this is called linking. In case of global data the linker knows that the global variables are always present in data segment of the executable and it also knows the size of executable and its data, so it automatically puts some hard coded address to speed up the process of fetching global data. As global data is placed in data segment so it increases the size of any executable file. The addresses assigned by the Linker are always logical addresses as a normal program never knows physical address unless some driver level

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