For example, attackers trying to execute return-to-libc attacks must locate the code to be executed, while other attackers trying to execute shellcode injected on the stack have to find the stack first. The first mainstream operating system to support ASLR by default was OpenBSD version 3.4 in 2003, followed by Linux in 2005.Īddress space randomization hinders some types of security attacks by making it more difficult for an attacker to predict target addresses. It is seen as a complete implementation, providing also a patch for kernel stack randomization since October 2002. The Linux PaX project first coined the term 'ASLR', and published the first design and implementation of ASLR in July 2001 as a patch for the Linux kernel.

In order to prevent an attacker from reliably jumping to, for example, a particular exploited function in memory, ASLR randomly arranges the address space positions of key data areas of a process, including the base of the executable and the positions of the stack, heap and libraries. JSTOR ( January 2018) ( Learn how and when to remove this template message)Īddress space layout randomization ( ASLR) is a computer security technique involved in preventing exploitation of memory corruption vulnerabilities.Unsourced material may be challenged and removed.įind sources: 'Address space layout randomization' – news Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.

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