确保以下目录的所属主和所属组是 root,且其它用户没有写入权限:
# ls -ld /usr/local/bin /usr/local/sbin /usr/bin/ /usr/sbin
dr-xr-xr-x. 2 root root 53248 Jun 24 15:09 /usr/bin/
drwxr-xr-x. 3 root root 4096 Jun 21 2021 /usr/local/bin
drwxr-xr-x. 2 root root 6 Jun 21 2021 /usr/local/sbin
dr-xr-xr-x. 2 root root 20480 Jun 24 15:09 /usr/sbin