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Shhhhh. No tears. Only dreams now. (lemmy.world)
submitted 3 weeks ago by ConstantPain@lemmy.world to c/linuxmemes@lemmy.world
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[-] korthrun@lemmy.sdf.org 3 points 3 weeks ago* (last edited 3 weeks ago)

My dumbass can only come up with three:

  1. You are already root (ok, fine)
  2. You have made /dev/ writable by non-privileged users
  3. Your non-privileged user already owns the symlink /dev/nul. Which "ok, fine", but also the point of command would have to be to functionally do nothing other than print out the error ln: failed to create symbolic link '/dev/nul': File exists

I would love to understand the use case behind #2. I am also curious to see even 7 more cases, let alone your figurative million.

In regards to #3 even if the behaviour of ln was to replace a symlink if it already existed, it'll probably have to unlink() the existing symlink, which I'm pretty sure is gonna get you a permission denied error on any /dev filesystem with sane permissions.

[-] nibbler@discuss.tchncs.de 1 points 3 weeks ago

ln could be +s

the kernel could have been modified

I'm sure there is some way if using capabilities

you don't need to be 'root', uid 0 is enough :)

[-] korthrun@lemmy.sdf.org 1 points 3 weeks ago* (last edited 3 weeks ago)

Follow up, tested and confirmed #3:

[korthrun@host]$ ls -l /dev/korth
.rw-r--r-- korthrun wheel 0 B Wed Jun 11 17:11:03 2025 /dev/korth
[korthrun@host]$ rm /dev/korth
rm: cannot remove '/dev/korth': Permission denied
this post was submitted on 11 Jun 2025
141 points (100.0% liked)

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