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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.Well, we've reviewed the concept of rules, And it has been understood that, A rule consists roughly of two logical units, Match conditions and actions, It is useless to say so much, Let's define a rule by hand. Here, we still take the INPUT chain in the filter table as an example, because the filter table is responsible for the "filtering" function, and if all messages sent to the local machine need to be filtered, they will first pass through the INPUT chain (PREROUTING chain has no filtering function), which is very similar to the "entry" scenario we refer to. Therefore, using the INPUT chain in the filter table as an example is helpful for us to understand.这一箭双雕的计策就是黄连出的。时尚设计师马萨巴古普塔的生活，她进入约会世界。PSH + ACK Flood6. Of course, the turn-on of the "MAC Address" filtering function on the router side will also cause the computer to be unable to normally access the network, and the "Unrecognized Network" prompt will also appear. In response, enter the router background Web interface, switch to the "Behavior Management"-"MAC Address Filtering" tab, and disable the relevant "Filtering Mode" by clearing the "Enable" item.逼比乡村版罗密欧与朱丽叶