Technical Analysis of GrapheneOS's Hardened Malloc Security Allocator

Summary

This article provides a detailed technical analysis of GrapheneOS's hardened malloc allocator, a security-focused memory allocator designed to protect against memory corruption vulnerabilities. Written from a security researcher's perspective, it explains the internal architecture of the allocator, including its security mitigations, memory protection mechanisms, and how it differs from standard libc allocators. The article covers the design principles behind hardened malloc, its implementation details, and the specific security features that make it effective at preventing common memory corruption attacks in the GrapheneOS mobile operating system.