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Multipass orchestrates virtual Ubuntu instances
https://multipass.run
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mknod: Operation not permitted #3453

Closed efra-mx closed 3 months ago

efra-mx commented 3 months ago

Describe the bug I am trying to create a kernel node using mknod but it results in operation not permitted

sudo mknod -m 666 dev/null c 5 1 mknod: dev/null: Operation not permitted

To Reproduce How, and what happened?

  1. Create an 20.4 Ubuntu image
  2. mulitpass start
  3. multipass shell
  4. sudo mknod -m 666 dev/null c 1 3

Expected behavior What did you expect to happen? I should create the dev/null file the the current folder

Logs Please provide logs from the daemon, see accessing logs on where to find them on your platform.

mar 28 00:20:55 Efra-Desktop sudo[1320399]: efra-mx : TTY=pts/1 ; PWD=/home/efra-mx/workspaces/colorado-university/assignment-1-efra-mx ; USER=root ; COMMAND=/usr/bin/mknod linux-build/rootfs/dev/consol> mar 28 00:20:55 Efra-Desktop sudo[1320399]: pam_unix(sudo:session): session opened for user root(uid=0) by (uid=1000) mar 28 00:20:55 Efra-Desktop sudo[1320399]: pam_unix(sudo:session): session closed for user root

Mar 28 09:43:43 entranced-treefrog sudo[3255]: ubuntu : TTY=pts/0 ; PWD=/home/ubuntu/assignment ; USER=root ; COMMAND=/usr/bin/mknod -m 666 linux-build/rootfs/dev/console c 5 1 Mar 28 09:43:43 entranced-treefrog sudo[3255]: pam_unix(sudo:session): session opened for user root by ubuntu(uid=0) Mar 28 09:43:43 entranced-treefrog sudo[3255]: pam_unix(sudo:session): session closed for user root Mar 28 09:46:00 entranced-treefrog sudo[3298]: ubuntu : TTY=pts/0 ; PWD=/home/ubuntu/assignment ; USER=root ; COMMAND=/usr/bin/mknod -m 666 linux-build/rootfs/dev/null c 1 3 Mar 28 09:46:00 entranced-treefrog sudo[3298]: pam_unix(sudo:session): session opened for user root by ubuntu(uid=0) Mar 28 09:46:00 entranced-treefrog sudo[3298]: pam_unix(sudo:session): session closed for user root

Additional info

Name: entranced-treefrog State: Running Snapshots: 0 IPv4: 10.0.245.173 172.17.0.1 Release: Ubuntu 20.04.6 LTS Image hash: edf43eb9f4e5 (Ubuntu 20.04 LTS) CPU(s): 1 Load: 0.00 0.00 0.00 Disk usage: 9.4GiB out of 58.1GiB Memory usage: 242.4MiB out of 3.8GiB Mounts: /home/efra-mx/workspaces/colorado-university/assignment-1-efra-mx => /home/ubuntu/assignment UID map: 1000:default GID map: 1000:default

Additional context Add any other context about the problem here.

sharder996 commented 3 months ago

Hi @efra-mx,

The reason you are getting a permission denied here is because you are executing the mknod command with a path that is inside your mount. Special files are not supported by mounts since your host filesystem doesn't know what to do with it. While it might not be an issue if you're are using a Linux host, Multipass supports Windows and macOS and those OS's are not going to know what those files are.

efra-mx commented 3 months ago

Thank you for your response. That clarifies my problem.

I did similar thing with vbox, and I had the same issue.

When generating the file inside the vm fisystem, it worked fine.

On Thu, Mar 28, 2024, 17:18 ScottH @.***> wrote:

Closed #3453 https://github.com/canonical/multipass/issues/3453 as completed.

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