树莓派重置密码

昨天折腾树莓派时感觉自己又上升了一个层次,于是设置密码时用了一个酷炫的新密码。今天起床后进系统发现傻逼了,完全想不起新密码是什么??好在硬件就在身边,重置一下密码就可以了。

以下是重置树莓派系统密码的步骤。

  1. 取出sd卡,放入usb读卡器中,连接到其它电脑;
  2. 在其它电脑中打开sd卡的cmdline.txt文件,在行尾加上init=/bin/sh。修改好后的cmdline.txt文件内容大致是这样:
    console=serial0,115200 console=tty1 root=/dev/mmcblk0p7 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait quiet splash plymouth.ignore-serial-consoles init=/bin/sh
  3. 把sd卡重新放入树莓派,通电开机。
  4. 出现树莓派的logo后很快进入命令行界面,可以看到行首是”#”,说明已经获取了root权限;
  5. 为了避免树莓派进入只读模式,重新挂载sd卡:mount -rw -o remount /
  6. 重置pi用户的密码:passwd pi,两次输入新密码;
  7. 让系统继续加载进入默认环境:exec /sbin/init
  8. 系统加载完后,登录用root权限修改/boot/cmdline.txt文件,将init=/bin/sh移除。

其原理是:系统以root权限启动,init=/bin/sh指令让系统启动时直接进入root用户的shell,进而可以做任何想做的事情。

参考

  1. http://mapledyne.com/ideas/2015/8/4/reset-lost-admin-password-for-raspberry-pi
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