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Figure 1 is an example of a JOP attack. In this example, the attacker's aim is to execute a system call "int 0x80" to open a new command line window. To do this, an attacker needs to modify the contents of the eax register to "0x0000000b" and the ebx register to the string "/bin/sh" before "int 0x80" is called, and the ecx and edx registers must point to the value "0x00000000". Suppose the value "0x0000000" and the string "/bin/sh" can be found in memory when the program is running. An attacker needs to construct the value "0x0000000b" himself. However, for the value "0x0000000b", when an attacker saves data to the stack through a buffer overflow, the "0x00" byte will trigger the system to terminate the read operation. This example specifically describes how the attacker uses the existing code snippet in the program to modify the value of val pushed into the stack by the attacker step by step from "0xffffff0b" to the value required by the system call "0x0000000b", thus implementing JOP attack. The following are the detailed steps of the process.陈桃花，是一个特别的女孩，也是春风镇无人不知无人不晓的风云人物，但她的特别，并不是来自於她本身，而是她那四个不论在外表出众的四个哥哥，他们四个每一个皆是女孩心目中的完美情人，但真正让他们声名大噪的，并不只是他们过人的优质魅力，而是他们对妹妹的过度疼爱……2. Ignoring defense does too much harm.Security executives are never willing to talk about these attacks because they do not want their remarks to attract more attention to the enterprise. They even worry that providing basic information on defense strategies alone will be enough to attract attackers to come and find security vulnerabilities.曾经，在一场事故中，副机长金允成（池珍熙 饰）和空中小姐崔智媛（柳善 饰）没能够救下一位在机舱中生产的产妇，导致产妇最终大出血死亡，留下了一个嗷嗷待哺的早产儿。这场事故之后，满心愧疚的金允成辞了职，远走他乡继续深造，一晃眼数年过去，学成归来的金允成重新回到了航空公司，担任了飞行教官的职务。初来乍到的菜鸟乘务员韩多真（具惠善 饰）是金允成手下的学生，心地善良积极向上的韩多真虽然对航空事业充满了热情和远大理想，可她的笨手拙舌和大大咧咧却令金允成对她十分失望。让金允成没有想到的是，曾经死去的产妇竟然正是韩多真的母亲，这层特殊的关系让金允成对韩多真多留了一份心思，亦因此发现了韩多真闪闪发光的美好品格。他觉得田遥被人骗了，如今事情弄明白了，吃了个教训，往后肯定会对红椒好的，所以希望红椒能原谅他。If you finally return from the SecondActivity page, you will return to FirstActivity at one time, and then exit the application after returning all the FirstActivities previously pressed into the stack.