Understanding Linux Process Memory Management: Virtual Address Spaces and Page Tables
By
0xkato
Hand-rolled, kettle-boiled, baked to perfection. Worth every minute at the bakery.
Summary
This article provides an educational deep dive into how Linux manages process memory, explaining the illusion of continuous memory that Linux creates for running programs. It covers virtual address spaces, page tables, memory allocation mechanisms, and how the kernel handles memory protection and security features like defenses against Meltdown vulnerabilities. The content walks through technical concepts including memory pages, address translation, and how to inspect memory mappings using /proc filesystem tools.
Key quotes
· 3 pulledLinux builds that illusion on the fly, one page at a time.
You run a program. It reads and writes addresses as if a giant, continuous slab of memory had been waiting there all along. It didn't.
This is a walk through what your process actually owns, what happens on the first touch of a byte, how protections and huge pages fit in, how to see the truth from /proc, and why modern kernels do a little extra dance to defend against Meltdown.
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