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58
votes
3answers
36k views

Why can rm remove read-only files?

If I create a file and then change its permissions to 444 (read-only), how come rm can remove it? If I do this: echo test > test.txt chmod 444 test.txt rm test.txt ...rm will ask if I want to ...
18
votes
2answers
6k views

Why doesn't mount respect the read only option for bind mounts?

On my Arch Linux system (Linux Kernel 3.14.2) bind mounts do not respect the read only option # mkdir test # mount --bind -o ro test/ /mnt # touch /mnt/foo creates the file /mnt/foo. The relevant ...
10
votes
3answers
426 views

bash: Some issue when using read <<<“$VARIABLE” on a read-only root partition. Any known workarounds?

Just by coincidence I had to use my ATA-ID-to-device-name script (found here: http://serverfault.com/questions/244944/linux-ata-errors-translating-to-a-device-name/426561#426561) on a read-only / ...
7
votes
2answers
5k views

ISO file readonly?

I have an ISO file and I mount it under /mnt/isofile. Then I copied this file to another folder. But the contents are read-only and belonged to root. I tried to use chmod and chown. But it prompts ...
16
votes
4answers
13k views

Mount a filesystem read-only, and redirect writes to RAM?

Is it possible to mount a loopback file as read-only, and redirect all writes to RAM?
9
votes
1answer
68k views

read only root filesystem

Somehow my Debian went to read only in root file system. I have no idea how this could have happened. For example when I am in /root folder and type command nano and after that press Tab to list ...
1
vote
1answer
1k views

Remount squashfs root filessytem read-write [duplicate]

I am working on an embedded device. The fstab shows the following info: <file system> <mount pt> <type> <options> <dump> <pass> /dev/root / ...
26
votes
2answers
7k views

How do I make a file NOT modifiable?

While logged in, I can do the following: mkdir foo touch foo/bar chmod 400 foo/bar chmod 500 foo Then I can open vim (not as root), edit bar, force a write with w!, and the file is modified. How ...
11
votes
2answers
4k views

Is using a read only root file system a good idea for embedded setup?

I have been tasked with running Linux as an operating system on an embedded device. The target has an x86 processor and has 8 GB CompactFlash device for storage. I have managed to use buildroot to ...
5
votes
3answers
1k views

Is making /etc directory read only a bad idea?

I have an embedded system setup built using buildroot and using initramfs. It runs on compact flash device where I have created separate ext3 partitions to mount /etc/ and /var directories as well as ...
3
votes
0answers
669 views

remount chrooted read-only subdirectory (non-mountpoint) to read-write from within jail?

I'm trying to do the same of this question (multiple linux installation on same filesystem) but I get this result (root filesystem mounted as read-only) . I'm using debian/sid, have successfully ...
2
votes
0answers
285 views

/home is Read Only after coming out of screensaver (intermittent)

I am using Linux Mint 13 (Maya) and I have my "/home" partition formatted as ext4 and mounted at "dev/sdc1". Occasionally I have a strange problem coming up that looks a lot like this bug that I ...