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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.Next, I began to learn JDK & JAVA from October to improve my knowledge. Design Pattern is a summary of the experience of predecessors in code development and a series of routines to solve specific problems. It is not a syntax regulation, but a set of solutions to improve code reusability, maintainability, readability, robustness and security.远古时期，正义的魔弹战士们为了世界的和平，早已开始和邪恶的魔物对抗，在双方实力平分秋色之下，魔弹战士失去了能量，而魔物的大魔王幽缘魔魂则化成原始的卵。那个邪恶的卵经过了几个世纪仍旧孕酿着复仇的杀机，新一代的魔弹战士将继承先人的遗志，继续为人类的和平奋斗。他直起身，我想去小解，劳烦林兄弟过来帮个忙。A. Men: singles, doubles传说中的“天人一”饭馆，海鲜贩子老虾米前来向正走霉运的封老板讨债。与此同时，绝色性感的美女，神秘威严的大人物，过气的功夫明星，国学大师，暴发户,流浪歌手，威严的跛腿警官老梅，女飞贼，憨保安，十二个神头鬼脸的人物阴差阳错地走进同一个饭局，引发了一系列爆笑的故事2. The coupling between the publisher and the subscriber is reduced. The publisher only publishes a message, and it does not care how the message is used by the subscriber. At the same time, the subscriber only monitors the event name of the publisher. As long as the event name of the publisher remains unchanged, it does not care how the publisher changes. Similarly, the seller (publisher) only needs to tell the subscriber (buyer) about the arrival of shoes, regardless of whether the buyer buys or not, or whether he buys other sellers. As long as the shoes arrive, the subscriber can be notified.