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But this is not over yet. Ethernet also requires CRC verification when transmitting data. The network card will CRC check the data packet before sending the data, attaching a 4-byte CRC value to the back of the packet header. At this time, the packet length is no longer 40 bytes, but 64 bytes, which is often referred to as SYN packet attack. The packet structure is as follows:她这便让几位组长坐下，拿出篮子里的工具，开始讲解风铃如何制作。四弟跟他一样，都长得像娘，就是性子闷了些，他可喜欢这个小弟弟了，偏三弟老喜欢惹他。根据Michael Connelly畅销侦探小说系列改编，洛杉矶警探博斯（Titus Weilliver）在指控一名连环杀手的同时调查一个13岁男孩的谋杀案讲述了洋行老板高金榜（郑丹瑞饰）与醉月楼老板斯凯梵（刘德凯饰）这对才子连手揭发假状元的事件中，成为莫逆之交，而因假状元的悉破而连带引出了威煌钱庄投机欺诈事件以及接中午而来的江南四大家族对付著名恒丰钱庄老板龙轩（柯俊雄饰）的一系列连锁布局，而令人意想不到的是连串布局的主谋洛一山，竟然是斯凯梵的亲生父亲……在这一系列揭发真相的过程中，斯凯梵亦随著情感的枷锁，困扰於曾多次舍命相救的洛一山养妇女洛曼琪（俞小凡饰）的恩情及承诺，以及与龙轩之女龙成钢（于莉饰）的一段真挚而刻骨的感情抉择中。本剧为爆款网剧《亲爱的柠檬精先生》的前传，交待了男女主在遭遇变故之前相恋结婚的故事。时光倒转回第一部故事七年前，看霸总如何高甜追妻，姊妹心怀鬼胎又如何再续爱恨纠葛。We know that in x64, the first six parameters of the function are stored in RDI, RSI, RDX, RCX, R8 and R9 registers in turn. If there are more parameters, they will be stored on the stack. Therefore, in order for the computer to run the commands we want, we need to find a way to put the address of "/bin/sh" into RDI so that the machine can execute the system function. After carefully examining the linux function stack structure, we can find that we can use RAX register to put the system () address into RAX, then look for code fragments with JMP rax to make use of, and at the same time use RDI register to pass the parameter "/bin/sh" to finally achieve the attack purpose.