使用 chmod 后根目录“/”被锁定

Question

我不小心用了

sudo chmod 3 /

它赋予根目录执行和写入权限，同时删除读取权限。我怎么能从中恢复，我sudo现在甚至无法使用。

Answer 1

由于您不能使用sudo，请改为尝试以下命令（您将通过pkexec获得 root 权限）：

pkexec chmod 755 /

在虚拟机中测试正常：

u@u-VirtualBox:/$ sudo chmod 3 /
[sudo] password for u: 
u@u-VirtualBox:/$ ll
ls: cannot open directory .: Permission denied
u@u-VirtualBox:/$ sudo chmod 755 /
sudo: unable to stat /etc/sudoers: No such file or directory
sudo: no valid sudoers sources found, quitting
sudo: unable to initialize policy plugin
u@u-VirtualBox:/$ pkexec chmod 755 /
==== AUTHENTICATING FOR org.freedesktop.policykit.exec ===
Authentication is needed to run `/bin/chmod' as the super user
Authenticating as: u,,, (u)
Password: 
==== AUTHENTICATION COMPLETE ===
u@u-VirtualBox:/$ ll
total 104
drwxr-xr-x  23 root root  4096 oct.  12 20:22 ./
drwxr-xr-x  23 root root  4096 oct.  12 20:22 ../
[...]
u@u-VirtualBox:/$