Security in multi-space environments relies on preventing escape attempts. 32-bit systems suffer from a well-known weakness: pointer integrity. Attackers can craft 32-bit addresses to guess kernel memory layouts. 64-bit systems employ features like Kernel Address Space Layout Randomization (KASLR) with 64-bit entropy, making brute-force attacks computationally infeasible. Moreover, 64-bit CPUs include features like NX bits (No-Execute), SMEP (Supervisor Mode Execution Prevention), and, on modern chips, virtualization extensions (VT-x/AMD-V) that create hardware root-of-trust for each space. In a 64-bit multi-space design, a compromised app container cannot easily break into the host—a guarantee 32-bit systems cannot make.
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