Safe in the sandbox: security hardening for Cloudflare Workers
5 hours ago
- #Memory Protection
- #Cloudflare Workers
- #V8 Security
- Cloudflare Workers runs customer code on globally distributed infrastructure for low latency.
- Security is a priority, with Workers designed to run third-party code securely on Cloudflare's hardware.
- Workers uses the V8 JavaScript runtime, benefiting from its security features developed for Chromium.
- Memory Protection Keys (PKU) are utilized to enhance security by restricting thread access to memory regions.
- V8's sandbox feature is employed to prevent memory corruption attacks from escalating beyond the V8 heap.
- Compressed pointers in V8 save memory and contribute to security by limiting pointer manipulation.
- Cloudflare has modified V8 to support isolate groups, allowing multiple sandboxes within a single process.
- Virtual memory management challenges are addressed by carefully placing sandboxes and using memory protection keys.
- Memory protection keys are used to create effective guard regions between sandboxes, enhancing security.
- Cloudflare is actively recruiting for roles related to V8 and similar language runtimes.