Questions tagged [permissions]
Permissions are the Unix way of controlling access to resources such as files, directories and devices and may be specified for an owner, group, or all users.
4,597 questions
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Give run0 privileges to user1 (an admin) as root?
I am very paranoid about security, trying to push the limits. I am curious about nosuid because I think it is very cool that we can prevent files from executing with elevated permissions by setting it ...
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Why could a perfectly accessible file fail to be opened due to EACCES?
I made a custom ~/.asoundrc on Ubuntu 24.04, but when I run alsamixer I get an error:
ALSA lib conf.c:4123:(config_file_open) cannot access file /home/ruslan/.asoundrc
ALSA lib conf.c:4043:(...
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What is /usr/sbin/authserver and the binary inside
When using the find command or any other recursive file searches, I always notice /usr/sbin/authserver in the context of a "permission denied" error. Just out of pure curiosity, what ...
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unison permissions between machines
I have two linux computers:
personal (arch, full root access)
workplace (ubuntu, no root access).
I am using "Unison" to sync some selected directories from one computer to an ext4 USB ...
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Why does `chmod 640` prevent group read access on macos?
I'm a student learning UNIX permissions and scripting on macOS. I created a short script that makes a file and applies chmod 640. However, a user in the same group cannot read the file.
Here is the ...
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How to fix selinux error: avc: denied { write } because the source level (s0:c145,c256,c512,c768) and target level (s0) are different
My Android app is trying to write to the /dev/video0 file but is getting the following AVC denial:
10-31 08:31:42.987 4786 4786 W com.my.app: type=1400 audit(0.0:41): avc: denied { write } for name=&...
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Permission denied with crontab -e program
I would like to run a custom script on startup. I added the script to my root crontab via sudo crontab -e and adding @reboot /path/to/my_custom_script.sh to the end. I made sure my_custom_script.sh ...
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where is my umask value set?
I'm explicitly setting umask to the same value (0077) in two locations:
~/.profile & in /etc/systemd/system/[email protected]/umask.conf per this comment:
[Service]
UMask=0077
Yet in my shell ...
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Unbind/re-bind usb device via systemctl service running as user (with a custom group)
Basically, without giving the user any new permissions, I am looking to be able to write to
/sys/bus/usb/drivers/usb/unbind
and
/sys/bus/usb/drivers/usb/bind
via a systemd service running as the ...
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Unable to save program data that uses root authentication dialog
I'm running Gnome 48 using Ubuntu on TUXEDO Pulse 14 laptop.
I have a program(Tuxedo Control Centre)that requires the root password to save
any settings.
The program works fine on another distro. When ...
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Scheduling file permission changes
I'm new with Linux and I worked on permissions recently. I'd like to find out if it is possible to schedule permission changes and how can it be done?
I mean if I want to give say a group, access to ...
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2
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Correct permissions for a LUKS key file
journalctl -b
shows:
systemd-cryptsetup[1807]: Key file /some-path/keys/sda1.luks is world-readable. This is not a good idea!
…
systemd-cryptsetup[1807]: /some-path/keys/sda1.luks has 0644 mode that ...
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User can't execute a shell script based on shebang but ok when interpreter directly invoked [duplicate]
Context
I have a system user caddy and a shell script placed under /run/caddy/caddy-cert-obtained-wrapper.sh.
/run and /run/caddy are owned by root:root with permissions 0755.
caddy-cert-obtained-...
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Permission denied using pv for copying image to USB drive
I am attempting to copy an Arch Linux ISO image directly to a USB drive. Previously, I have simply used either cp or dd to do this, such as:
sudo cp image.iso /dev/sdb
where /dev/sdb is the USB ...
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Killing a process with ruser root and euser user
I'm learning linux permissions and confused about the permissions for killing a process.
First, from kill(2) manpage:
For a process to have permission to send a signal it must either be privileged (...
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