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..............Prototype method:Come late, I have work to doFigure 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.Move维迪娅天真、单纯而怀着美好理想。她虽出自贫寒之家，但却在母亲的关爱下长大。维迪娅的唯一缺点是不识字。塔克家族为了使儿子能顺利继承家产，精心为其挑选新娘，在众多想嫁给富人的姑娘中发现了美丽善良的维迪娅。 　　维迪娅的叔叔婶婶霸占了维迪娅父亲遗留的房产，并使柔弱的维迪娅母女成为家中的佣人。婶婶希望自己的女儿能嫁入塔克家而千方百计地阻挠维迪娅和塔克家的人见面。几经波折后，昔日的灰姑娘维迪娅终于成为赛格·塔克的新娘，可这个如童话般浪漫的婚礼却成为了她噩梦的开始。 　　新婚之夜，维迪娅赫然发现原来心仪的赛格竟然是神智错乱的疯子，洞房花烛却被新郎拒之门外。而疼爱她的公公不久也被三个女儿气得突发重病去世。他临终前留下遗嘱，所有财产由维迪娅全权继承。 　　维迪娅的婚姻生活充满了艰难和痛苦，一方面赛格的同父异母三个姐姐想方设法要把她扫地出门，另一方面赛格精神错乱受控于大姐珊朵拉。家中的关系更是错中复杂，大姐心中充满仇恨，二姐玛华纵容着她风流成性的丈夫卡迪克，而三姐查卓姆克更听信了哈尔什的甜言蜜语对他这个小龙女，看得我直打寒颤。