// In a loop, this can exhaust connection pools
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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别管什么开笔要文采飞扬，别想什么成篇要结构精妙，就一个字：写。像和老朋友聊天那样放松地写，像在酒桌上给人讲故事那样洒脱地写。让文字先流出来，哪怕是杂乱的水，也得先有个池子装。
第四节 妨害社会管理的行为和处罚