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What is address space layout randomization (ASLR) and how does it work?

Unfortunately, nothing is perfect, but address space layout randomization (ASLR) is one of the best mitigations available. ASLR works by breaking assumptions that developers could otherwise make about where programs and libraries would lie in memory at runtime.

What is the effectiveness of address space randomization?

Effectiveness. Address space layout randomization is based upon the low chance of an attacker guessing the locations of randomly placed areas. Security is increased by increasing the search space. Thus, address space randomization is more effective when more entropy is present in the random offsets.

How to disable address space randomization in Linux?

The randomization can be disabled for a specific process by changing its execution domain, using personality (2). Kernel address space layout randomization (KASLR) enables address space randomization for the Linux kernel image by randomizing where the kernel code is placed at boot time.

How does entropy affect address space randomization?

Thus, address space randomization is more effective when more entropy is present in the random offsets. Entropy is increased by either raising the amount of virtual memory area space over which the randomization occurs or reducing the period over which the randomization occurs.


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