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Singleton mode refers to ensuring that there is only one instance of a class and providing a global access point. It solves the problem of the number of entity objects, while other builder modes all solve the coupling problem brought by new. The main points of its implementation include: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.贤弟今天收工早啊。眼中已经有了湿意。胡钧表现出超常的果决和狠厉。这一天过去，陈启不仅手发酸，脸上更是笑得都僵硬了。