WP6c: Anti-debug hardening (BRK scanning, timing, self-ptrace)

[Brad-Edwards]

Context

Only anti-debug is prctl(PR_SET_DUMPABLE, 0). No detection of software breakpoints, timing anomalies, or external debugger attachment.

Work

• New daemon/anti_debug.{h,c}:
  • BRK instruction scanning: scan game .text for ARM64 BRK (0xD4200000 mask) not present at baseline
  • Timing calibration: measure calibrated loop execution time, detect single-step slowdown
  • Self-ptrace: PTRACE_TRACEME at daemon startup for explicit detection
• New tests/test_anti_debug.c

Tests

6 unit tests.

Part of v2.0.0