this post was submitted on 11 Jun 2025
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    submitted 1 week ago by [email protected] to c/[email protected]
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    [–] [email protected] 13 points 1 week ago (5 children)

    The ingenuity of this command is that /dev/nul does not exist, the correct path is /dev/null, however the command executes without error and creates a symlink to a non-existing path.
    The only thing missing is sudo.

    [–] [email protected] 0 points 1 week ago (1 children)

    there are a million cases where sudo is not required.

    [–] [email protected] 3 points 1 week ago* (last edited 1 week ago) (2 children)

    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.

    [–] [email protected] 1 points 1 week ago* (last edited 1 week 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
    [–] [email protected] 1 points 1 week 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 :)

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