Lovell signed up to a programme that sent him to college at the military's expense while training as a fighter pilot.
The key is the test TST_SEL_RET on line 682. It compares the RPL of the return CS selector (saved on the stack by the original CALL) against the current CPL. If RPL == CPL, the PLA returns 0x000 (continue) and LD_DESCRIPTOR finishes normally -- same-privilege return. If RPL CPL, the caller is returning to a less-privileged ring, so the PLA redirects to 0x686 (RETF_OUTER_LEV) -- the cross-privilege path that must also restore the caller's stack. If RPL
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（八）提供数据调用接口服务的，应当建立身份认证、权限鉴别等技术措施，采取监测发现、防范、阻断、处置违法违规调用数据的措施；
Anthropic 的杀手锏，恰恰最难蒸馏