Buffer overflow occurs when a buffer has been overrun in which memory area?

Buffer overflow occurs when a buffer has been overrun in which memory area?

• A. Occurs when a buffer has been overrun in the stack space
• B. Occurs when a buffer is left uninitialized
• C. Occurs when a buffer is overrun in the heap space
• D. Occurs when a buffer is underused

Answer: (A)

Buffer overflow arises when you write more data into a buffer than it can hold, spilling into adjacent memory. The most common scenario for this is when a local buffer is allocated on the stack as part of a function’s stack frame. If code writes beyond the end of that stack-allocated buffer, it can overwrite nearby data such as the saved frame pointer or the return address, leading to unpredictable behavior or control-flow hijacking. While overflows can also occur on the heap with dynamically allocated buffers, the classic and most directly tested memory area for a buffer overflow is the stack space, making it the best answer. Heap overflows are possible too, but they involve different consequences and are not as central to the typical overflow concept.

Buffer overflow arises when you write more data into a buffer than it can hold, spilling into adjacent memory. The most common scenario for this is when a local buffer is allocated on the stack as part of a function’s stack frame. If code writes beyond the end of that stack-allocated buffer, it can overwrite nearby data such as the saved frame pointer or the return address, leading to unpredictable behavior or control-flow hijacking. While overflows can also occur on the heap with dynamically allocated buffers, the classic and most directly tested memory area for a buffer overflow is the stack space, making it the best answer. Heap overflows are possible too, but they involve different consequences and are not as central to the typical overflow concept.