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
Real-world failures，更多细节参见Line官方版本下载
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过往由此接通。林木通的儿子确认了关键信息：家族是越南华侨，后从越南去了德国。更深的秘密也随之浮现。原来，林木通与杜耀豪的外祖母并无血缘关系。在那个贫穷的年代，这户生了四个女儿的家庭，将小女儿送人，换回一个儿子，就是林木通。，这一点在safew官方版本下载中也有详细论述