Windows kernel aslr11/21/2022 The payload will overwrite data the program intends to access. In a buffer overflow, attackers feed a function as much junk data as it can handle, followed by a malicious payload. What Is ASLR?Īddress Space Layout Randomization (ASLR) is primarily used to protect against buffer overflow attacks. At no point does the program directly interact with RAM. The MMU translates between virtual and physical addresses, returning that information to the operating system. The operating system contacts the CPU’s memory management unit (MMU). When a program needs to access memory, it gives the operating system a virtual address. The program is not allowed to look at another program’s memory. All the program sees is a single continuous chunk of memory addresses for its exclusive use, called virtual addresses. They can just ask the operating system for additional memory (or return unused memory) as necessary. Programs don’t need to worry about where other programs are storing data, or how much RAM is left. Virtual memory makes it easier for programs to manage their own memory, and also makes them more secure. This process is called paging, and lends its name to the pagefile.sys file on Windows. When the stored pages are needed, they’ll switch spaces with less necessary pages currently in RAM. If there is not enough RAM to store all the pages at once, the pages least likely to be needed are stored on the slower (but more spacious) hard drive. The operating system allocates chunks of memory to programs called pages.
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