this post was submitted on 30 Dec 2023
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[–] [email protected] 58 points 11 months ago (3 children)

sudo chmod 000 -R / is very fun way of braking your system and is not widely known πŸ™‚

[–] [email protected] 8 points 11 months ago (2 children)
[–] [email protected] 14 points 11 months ago (1 children)

I imagine if you can mount from a busybox possibly

[–] [email protected] 8 points 11 months ago (2 children)

Then figure out the correct perms.

[–] [email protected] 13 points 11 months ago (3 children)

Eh, just hit it with the 777 and pray. Then swear at it some more.

[–] [email protected] 4 points 11 months ago

I think you'll need to change passwd and shadow, maybe a few other files, but besides that it'll mostly work.

[–] [email protected] 2 points 11 months ago

This is the traditional method.

[–] [email protected] 4 points 11 months ago (1 children)

Yeah that's the painful part. A backup would be key here

[–] [email protected] 1 points 11 months ago

Worst case you boot up a virtual server with the same OS as your own and just go down the tree learning permissions, and it’s a deep dive learning experience.

[–] [email protected] 1 points 11 months ago

chroot in and then syncing the permissions from something like the equivalent of filesystem package in Arch for your distro should get you going

[–] [email protected] 2 points 11 months ago (3 children)

What does this do? nobody can read any file? would sudo chmod 777 fix it at least to a usable system?

[–] [email protected] 11 points 11 months ago

The trick is that you loose access to every file on the system. chmod is also a file. And ls. And sudo. You see where it's going. System will kinda work after this command, but rebooting (which by a coincidence is a common action for "fixing" things) will reveal that system is dead.

[–] [email protected] 10 points 11 months ago

Yep. You could run chmod again to fix it (from a different OS / rescue USB), but that would leave all the permissions in a messy state - having everything set to 777 is incredibly insecure, and will also likely break many apps/scripts that expect more restrictive permissions. So the only way to fix this properly would be to reinstall your OS/restore from backups.

[–] [email protected] 4 points 11 months ago

How are you gonna run chmod when you don't have permissions to use it anymore?