Keyword Analysis & Research: linux address space layout

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What address space does Linux use?

Linux is using a split address space for 32 bit systems, although in the past there were options for supporting 4/4s split or dedicated kernel address space (on those architecture that supports it, e.g. x86). Linux always uses split address space for 64 bit systems.

What is split address space in Linux?

Linux always uses split address space for 64 bit systems. On overview of the Linux address space is presented below: Linear mappings refer to particular way of mapping virtual pages to physical pages, where virtual page V, V + 1, ... V + n is mapped to physical pages P, P + 1, ..., P + n.

What is kernel address space?

The book uses the term "kernel address space" to refer to the partition of the virtual address space that is allocated for the kernel. Recently, Linux and other OSes have implemented page-table isolation (PTI) to mitigate the Meltdown security vulnerability. With PTI, the kernel does have its own address space (as the image from Wikipedia shows).

What is address space layout randomization?

Address Space Layout Randomization (ASLR) is a memory-protection process for operating systems that guards against buffer-overflow attacks. It helps to ensure that the memory addresses associated with running processes on systems are not predictable, thus flaws or vulnerabilities associated with these processes will be more difficult to exploit.

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