欧美特级限制片香蕉

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.The first one will last for 3 minutes, and the second one will last for 1 minute.板栗和小葱听了都惊诧不已。　　Syfy宣布剧集《#凡妮莎海辛# Van Helsing》续订第五兼最终季，13集最终季将于明年初开机拍摄，预定同年播出。他这时候才含泪低泣，闷沉沉的哭声在地洞里回荡，引得崖石后的黑影也掉下了眼泪——那个常来喂乌龟的小娃儿被狼吃了么？转头看向那些乌龟：你们再也等不到他了。Unicom