This article explores an obscure Linux kernel behavior where writing to /proc/self/mem can bypass virtual memory permissions, allowing modifications to read-only or executable memory regions. The feature is intentionally implemented and used by projects like Julia JIT compiler and rr debugger. The analysis examines how the kernel bypasses hardware memory protection constraints and the implications for system security.
Background
Linux's /proc filesystem exposes kernel and process information as virtual files. Memory protection mechanisms like read/write/execute permissions are fundamental to modern operating system security.
- Source
- Lobsters
- Published
- Mar 9, 2026 at 04:09 PM
- Score
- 7.0 / 10