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.本剧是星际旅行系列电视剧的最新一部,但故事的源头却很古老,故事开始于星际旅行历代剧目之前,可以说是星际旅行的前传。时间设定大约是地球公元2150年左右,距离人类科学家第一次发现曲速原理一百年后。人类经过近百年的艰辛努力,终于成功研制第一套可以稳定超光速飞行的曲速引擎,并为之建造了一艘人类历史上最大的太空飞船,Enterprise!这艘飞船,是人类几代努力的结晶,它象征着人类不断进取,努力前进的精神!并将带我们进入那"人类前所未至的宇宙洪荒"!!We know that TCP protocol opens up a relatively large memory space backlog queue to store semi-connection entries. When SYN requests continue to increase, and this space causes the system to discard SYN connections. SYN cookies technology is designed to enable the server to process new SYN requests even if the semi-connection queue is full.该剧以抗战时期的延安为背景展开一系列抗战锄奸的故事。根据抗日战争时期党史机密档案中所描述的中统、军统、日本派遣间谍在延安的秘密特务活动编写，讲述了抗战时期的延安边区保安处处长周劲为了保卫延安以及中央首长的安全，与潜伏的间谍、日军特务、叛徒以及土匪之间斗智斗勇的故事。八路厨子史大料自称是鲁菜传人，实际只会做大锅菜，后来卧底在日军当厨，差点露馅惹出大麻烦。那天队伍打了胜仗，他也终于有了失散多年的儿子史来风的消息，本来是请假去找儿子，却接到团长于啸江的紧急任务，令他打入日军，弄清敌军神秘人的身份和阴谋，并派他的初恋李二芹同志与他单线联系。史大料误打误撞以厨子身份卧底在日军营，殊不知当日与他从日军包围中一起逃脱的难兄难弟、饭馆老板老秋正是日军神秘人秋山静。史大料、李二芹假戏真做成了夫妻，两人互相掩护，与敌人斗智斗勇，一次次识破对方阴谋，为八路军截取关键情报。其子史来风被于啸江接进队伍，行动中多次与史大料相遇却互不知身份，而史大料隐约感觉张家少爷张少言可能才是他的儿子。史大料这边正苦恼到底哪一个才是他的儿子，史来风则已认定史大料为汉奸，与他针锋相对，险些亲手杀了“父亲”。史大料终于查出神秘人身份，并弄清敌人R计划的核心是掠夺我国稀土矿。为了掩护史大料的身份，李二芹英勇就义，我军根据史大料的情报，外加张少言的帮助，经历重重困难，找到炸矿方法。One last thing on this subject, The 7.62 mm traced armour-piercing firebombs fired by the 81-1 family, Although the name is a little long, But compared with ordinary munitions, The difference is still well understood: Tracing and burning are simple, Is to add two corresponding drugs, The armor piercing is to replace the steel core behind the bullet's brass back armor (also known as bullet head) with a harder tungsten alloy core with stronger penetration to hard targets. The latter is also the tail-stabilized shelling penetrator used on the third generation of modern main battle tanks (abbreviation: APFSDS) is one of the two main materials (the other is the notorious, highly radioactive depleted uranium penetrator core, The user country is mainly the United States, while China mainly uses tungsten alloy penetrators, Less pollution and better performance, The United States does not need to. First, the United States does not pass the standard of tungsten treatment technology. Far from the level of our country, Secondly, the United States is a tungsten-poor country. It also wants to fully use tungsten alloy bombs, But it can't be used, But as a nuclear Power, There is a lot of depleted uranium as nuclear waste, so depleted uranium is selected as a substitute. As for tungsten alloy and depleted uranium, after putting aside the key additional condition of radioactive pollution, the pure question of who is better in armour-piercing performance is not directly related to this article, so it will not be described in detail).
