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    <p>The sections are predetermined by the executable file.</p> <p>Besides that one, there may be those of any dynamically linked libraries. While the code and constant data of a DLL is supposed to be shared across multiple processes using it and not be counted more than once, its process-specific non-constant data should be accounted for in every process.</p> <p>Besides, there can be dynamically allocated memory in the process.</p> <p>Further, if there are multiple threads in the process, each of them will have its own stack.</p> <p>What's more, there are going to be per-thread, per-process and per-library data structures in the process itself and in the kernel on its behalf (thread-local storage, command line params, handles to various resources, structures for those resources as well and so on and so forth).</p> <p>It's difficult to calculate the full process size exactly without knowing how everything is implemented. You might get a reasonable estimate, though.</p> <p>W.r.t. <code>According to my understanding when some buffer overflows happens then the address gets corrupted.</code> It's not necessarily true. First of all, the address of what? It depends on what happens to be in the memory near the buffer. If there's an address, it can get overwritten during a buffer overflow. But if there's another buffer nearby that contains a picture of you, the pixels of the picture can get overwritten.</p> <p>You can get segmentation or page faults when trying to access memory for which you don't have necessary permissions (e.g. the kernel portion that's mapped or otherwise present in the process address space). Or it can be a read-only location. Or the location can have no mapping to the physical memory.</p> <p>It's hard to tell how the location and layout of the stack and heap are going to affect performance without knowing the performance of what we're talking about. You can speculate, but the speculations can turn out to be wrong.</p> <p>Btw, you should really consider asking separate questions on SO for separate issues.</p>
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    1. POHow Process Size is determined?
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    1. USAlexey Frunze
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    1. COthanks...I will keep that in mind next time...:-)...thanks for the explanation.
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      1. USSohrab Ahmad
 

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