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? Singleton pattern is the most common and simplest design pattern in design pattern, which ensures that only one instance exists in the program and can be accessed globally. For example, account information object management used in actual APP development? Objects (SQLiteOpenHelper) and so on all use singleton mode. This model has several advantages:公孙匡受不了了，从张槐问青木还剩多少家底的时候，他就感觉这些乡民的目光好似箭一般戳向他，而张家人若无其事的表现也让他满心烦躁和不安——不应该是这个样子的。For the convenience of the experiment, we directly use the functions in libc.so.6 as the attack functions to be executed. This is a C program runtime in Linux, which holds a large number of available functions and contains system ("/bin/sh"). Therefore, we can use ROPgadget tool to obtain the code fragments that we can exploit, and use pwntool to exploit the vulnerabilities of vulnerable programs, thus achieving our attack purpose, that is, running system ("/bin/sh"). In order to facilitate the subsequent use of ROPgadget tool to find gadget and attack, it is necessary to copy the libc.so.6 file to the operation directory. First, use the "ldd" command to view the source directory, and then use the "cp" command to copy it to the operation directory.4. CSRF Vulnerability Detection敬文娘急忙站起身道：我来扶她走，还不耽误说话。1979年的冬季，北大荒某生产建设兵团接到了知青返城的文件，但团长却想扣押这份文件。工程连营区女战士裴晓芸头一次背枪上岗，心情格外激动，连长曹铁强告诉她下岗时去白桦林接她。团部会议室里，各连干部就团长擅自扣压文件一事展开了激烈的争论。曹铁强回忆起往事，感觉到任何人也阻挡不了知青返城的浪潮。寒风更加猛烈，一场暴风雪咆哮席卷了北大荒，800名知青举着火把汇集到团部，愤怒地等待着团部的答复。场面突然失控...1. DNS QUERY flood attack