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Causes of Address Space Expansion:

Shared Memory: P1 might explicitly request or be configured to use shared memory regions.These regions are intentionally made accessible to multiple processes for inter-process communication (IPC).Violation of Process Isolation:

Generally No, if Intentional: If the sharing of memory is intentional and managed by the operating system (e.g., through shared memory segments or memory-mapped files), it does not violate process isolation.Process isolation aims to prevent accidental or unauthorized access to another process's memory.

Causes of Address Space Expansion:

Shared Memory: P1 might explicitly request or be configured to use shared memory regions. These regions are intentionally made accessible to multiple processes for inter-process communication (IPC).
Memory-Mapped Files: If P1 maps a file into its address space and P2 also maps the same file, they will share that portion of memory.
Dynamic Linking Libraries (DLLs): If both P1 and P2 use the same DLL, the code and data of the DLL will be loaded into memory and shared between the processes.
Violation of Process Isolation:

Generally No, if Intentional: If the sharing of memory is intentional and managed by the operating system (e.g., through shared memory segments or memory-mapped files), it does not violate process isolation. Process isolation aims to prevent accidental or unauthorized access to another process's memory.
Yes, if Unintentional: If the expansion is due to a bug or security vulnerability that allows P2 to access P1's memory without authorization, then it is a clear violation of process isolation.