I cannot understand a permission issue. for details, refer to general Linux technology-Linux programming and kernel. Ask a permission-related question. I have done the same experiment in both cases, but I cannot understand it.
The cause is that I used a linux stb in my company to mount rootfs to a pc using nfs, and used the root user. then I used stb, create a file with vi on rootfs and save and exit. Then, check the file on the pc, and show that all people and groups are root.
However, when I log on to the pc as a non-root user and use vi to edit the file, a message is displayed, indicating that the file is a read-only file. after modification, the file is forcibly written, saved, and exited. Now, check this file, and the owner and group have become non-root users?
By the way, I have confirmed that the permission for this file is always-rwxr -- r --. should it be that only everyone has the permission to modify it? Others should be read-only.
According to my understanding, this type of permission file cannot be modified by others, right? Why can we use non-everyone to force modification? Isn't there any security?
At that time, I was wondering if the NFS logon mode was special. I did the same experiment on linux at home after work, and the results were consistent. I still can modify the results, after the modification, the owner and group are changed to the modifier.
I cannot understand this. could you give me some advice?
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