Signal Handling in Hyperlight

Hyperlight registers custom signal handlers to intercept and manage specific signals, primarily SIGRTMIN. Here's an overview of the registration process:

• Custom Handlers:
• SIGRTMIN Handler: Utilized for inter-thread signaling, such as execution cancellation.
• Killing a sandbox:
  • To stop a sandboxed process, a SIGRTMIN signal must be delivered to the thread running the sandboxed code.
  • The sandbox provides an interface to obtain an interrupt handle, which includes the thread ID and a method to dispatch the signal.
  • Hyperlight uses the pthread_kill function to send this signal directly to the targeted thread.