The "root" account is the most privileged account on a Unix system.

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Process ownership on linux changes to root when the user tries to kill the process

We have a bunch of RHEL machines which all run an application binary that is owned by root and has SUID set. Let's say user X starts the application, the process starts with PPID 1, since SUID is set ...
16
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3answers
34k views

How do you change the root password on Debian?

I want to change the password I assigned to root on my Debian webserver to something longer and more secure. Bit of an obvious newbie question, but how do I do that? I haven’t forgotten/lost the ...
28
votes
4answers
4k views

Why is root login via SSH so bad that everyone advises to disable it?

Everybody on the Internet advises to disable root login via SSH as it is a bad practice and a security hole in the system, but nobody explains why it is so. What is so dangerous in enabling root ...
7
votes
7answers
225 views

Emptying a file for root user does not work [duplicate]

I use below command to empty a file > file.txt It works perfectly fine! But there are some files with root user permissions. So I tried sudo > different-file.txt and I got below verbose ...
47
votes
3answers
2k views

How do the internals of sudo work?

How does sudo work internally? How is it possible that it can become root without having the root password, unlike su? What syscalls, etc. are involved in the process? Is it not a gaping security hole ...
0
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1answer
33 views

When does Linux send a root mail and how to force it for testing purposes?

Let's say I want to test root mail functionality after I set up nullmailer, how do I force my Debian Linux system to send a root mail? And furthermore on which events does Linux send root mails at ...
0
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1answer
20 views

Convenient way to upload a file to a server's application directory?

I very often need to upload some kind of file to a server, to put some application directory somewhere. Since my user account is of course unprivileged, I generally have to do this: scp file.txt ...
1
vote
1answer
423 views

How to execute changes on remote server as root?

I'm wondering if there is a way to execute a script/commands from the the local machine without making any modifications as root on the remote machine? Some background I'm trying to setup some tasks ...
5
votes
2answers
142 views

Log all root activity with original username who su'd/sudoed to root

What is the preferred method to keep track of who is acting as root in the logs when root login is disabled (SSH) but users can run sudo -i or su - to become root? I would like to follow every ...
0
votes
2answers
943 views

How to auto log on with root user in Fedora?

I'm a newbie in Linux, and I want to enable auto log on with root user for specific purpose. It's so bored when every time I power on my PC to study and I have to input user and password.
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0answers
24 views

OpenEmbedded: root account doesn't exist!

I'm using the current OpenEmbedded system from: http://git.openembedded.org/openembedded-core/tree/ (For what it's worth, I'm also pulling in layers from ...
0
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0answers
29 views

Run Xserver as root

I am working with an ARMStone a9 board which has iMX6 linux kernel. I am doing an embedded application in which I have to show a video from Ipcamera. The thing is that I attached the screen to my ...
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5answers
763 views

How to Determine the IP Address of who logged into Root?

There are several people with root access to a particular VM I am in charge of. I would like to find out which IP address was used to log into root.
2
votes
1answer
22 views

Linux Mint root app theming breaks when changing controls

So, this is a strange occurrence, which seems similar to other questions but which I've not been able to find a reference for. Maybe my Google-Fu is not strong right now. It seems to be a common ...
1
vote
2answers
9k views

Enable root login from GUI

I just installed Mint 16 and I see that root user is not available at login screen. I log in from normal user and went to "Login Window" option and there I set "Allow root login". Then I restarted the ...
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votes
0answers
40 views

Become root after login via plink from Windows host

I m trying to connect to a linux server from Windows host via plink. I couldnt figure out how to become root after logon. I have to login with ordinary user first as I can't change config of the ...
3
votes
1answer
39 views

Software like Iceweasel and LibreOffice wont run without root/sudo

I recently decrypted my home directory by making a backup of my home directory, deleting the directory, and then replacing it again with the backup (followed a guide). Ever since, I can no longer run ...
8
votes
1answer
634 views

Lightweight virtualization on Linux with user isolation

What Linux-on-Linux virtualization technologies provide user isolation? Specifically, I want root in the virtual machine not to have any privilege on the host. This was not the case for LXC, but was ...
13
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4answers
20k views

Why is Debian's root shell colorless?

Are there any security concerns? What is the best way to enable it?
1
vote
1answer
6k views

switching from user to root and revers (FreeBSD)

I want to make some modification with root and then with my user, in fact I want to install sudo and he give me the error in the first step: cd /usr/ports/security/sudo make install clean ...
0
votes
1answer
38 views

install .deb package locally without using sudo [duplicate]

I am using Debian in my office which is controlled by an administrator. I want to install rescuetume. I downloaded the .deb file in my local disk and I want to install it locally. Every time I do ...
36
votes
4answers
24k views

Reserved space for root on a filesystem - why?

I understand that by default, newly created filesystems will be created with 5% of the space allocated for root. I also know you can change the defined space with: tune2fs -m 1 /dev/sdXY What I'm ...
3
votes
3answers
2k views

Problem with vim when logged in as root

When I login as root or edit a file by sudo mode all of the options in my /etc/vimrc are not working (e.g. highlight line-number etc.)
3
votes
1answer
95 views

How to determine if X server runs with root privileges

This is a one-liner: Is there a way/command to check if the X server is run as root or as user? This was supposed to be a one-liner but alas... I recently upgraded my Arch Linux box. After the ...
37
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5answers
3k views

Becoming root from inside Vim

Sometimes I start editing configuration files in /etc using Vim, but forget to use sudo to start Vim. The inevitable result then is that after finishing my edits I encounter the dreaded notice that I ...
3
votes
2answers
646 views

Linux SSH logging via PUTTY

I have Linux console, managed from Windows. Can login to Linux console from MSTSC service of Windows, as xrdp is installed on Linux. However I cannot login via Putty with SSH connection. It's ...
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2answers
37 views

How do I run as a limited user while logged in as Root, and another question

Is there a way to, on linux, do: run as limited user when logged in as root? (like sudo but vice versa, so instead of GRANTING rights, it limits them, i.e., for use with "bundle install" for missing ...
0
votes
1answer
53 views

How should I change root@mydomain when I send from mail() php function?

I've installed sendmail in Ubuntu as below: apt-get install sendmail Then I sent an Email to test, I received Email from root <root@mydomain>. I checked the content of /etc/aliases, but it ...
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2answers
65 views

Unable to get rid of root user and privileges

I am told that the most basic security to set up in Linux is to change the superuser name from root to something obscure so I run these steps to add new user $ /usr/sbin/adduser new_username $ ...
4
votes
1answer
77 views

how to verify if root password changed correctly

I have an OpsWare task, that changes root passwords on a massive number of servers, by replacing the root's password hash in /etc/shadow file. I need a script of some sort, which preferably runs ...
6
votes
3answers
11k views

How to get back sudo on Ubuntu?

I have done this: sudo chown -R myname /usr/ and now I can't use the sudo command because of this error: sudo: must be setuid root And as I read this means that the owner of this file ...
1
vote
3answers
108 views

Vim Error 'E212: Cannot open file for writing', when trying to create new files outside of home dir

I am running Wheezy Debian. When I try to create a new file in a directory other than my home directory, such as /var/www, I get the following error in vim: E212: Cannot open file for writing. I ...
17
votes
4answers
1k views

How universal is sudo?

I was writing some instructions on how to install something (TeX-related - if you don't ask, I won't ruin your day by supplying more details) and used sudo to install system-wide. Someone commented ...
0
votes
2answers
3k views

Changing root password does not change sudo password

I'm trying to change the password that get's asked when doing sudo. I'm in Ubuntu. Doing 'sudo passwd' or 'sudo passwd root' does give me the two new password questions, and it successfully changes ...
2
votes
1answer
27 views

Desktop app run by admin user (but not explicitly with sudo) takes file ownership of shared file

Similar to http://stackoverflow.com/questions/15143614/file-ownership-changes-to-root-after-saving-from-a-program-in-ubuntu but I can't use the answer since I'm not running a command-line app as sudo. ...
5
votes
1answer
192 views

No password to run command as root for fixed command? [duplicate]

Is it possible to define a rule in sudoers to allow one user to run one well defined command as root, without password or other authentication except being the right user? Are there alternatives to ...
2
votes
1answer
53 views

Does root not require a password to log in as a user?

Does root not require a password to log in as a user even though a password has been set for that user? When I am logged in as "root", su user logs me in as "user". There is no prompt for a password. ...
0
votes
2answers
103 views

Openning root terminal by keyboard shortcut

I am using Debian Linux and I am setting some shortcuts on it. So in keyboard window I went to shortcut, added gnome-terminal, and set Ctrl + t as the keys. But in Debian we also have "Root ...
1
vote
4answers
292 views

How to correctly enable sudo for user in Fedora 20

I followed this question in order to enable sudo command for my created user. So I added it into the wheels group and edited the /etc/sudoers file accordingly. But what I don't get about this is when ...
0
votes
2answers
91 views

Error when running X11 application as root

I get this wierd error when I run applications as root. **(gedit:630): WARNING **: could not open X display No protocol specified Unable to init server (gedit:630): Gtk-WARNING **: Cannot open ...
2
votes
3answers
324 views

Is this command safe to run from / as root

find . * -depth -print0 | xargs -0 rmdir It finds and removes all empty folders (including hidden ones) recursively. I only tired it on my home folder and a pendrive in Linux PC and it worked but I ...
0
votes
2answers
41 views

On Arch Linux Partitioning [closed]

I've been going through the Arch Linux beginner's guide and I'm a bit confused on partitioning the OS. It says I can either have just a root partition or a root and /home partition. What are the ...
2
votes
1answer
86 views

su not asking for password

My su does not ask for password. When I run su it simply logs me in to root. I tried su - root then it asks for password. Now, because of this kdesu runs applications with root rights without ...
2
votes
1answer
44 views

Copy file from USB drive to a desktop loaded via a LiveCD

I have booted my computer using a LiveCD and want to copy a file from a USB drive to the LiveCD loaded desktop. I want to copy a file from the USB drive to the desktop environment in memory, which ...
3
votes
1answer
136 views

Some software runs only by root terminal

I'm facing this odd situation here, programs such as gparted, furiusisomount and Rstudio never run by clicking on their icons in the applications menu or by running them with terminal as a normal ...
1
vote
1answer
66 views

login scenario and root ssh access block

I'm kinda new to linux so bear with me. I followed a tutorial on how to grant root access to other users and what I did was, in /etc/passwd/ I changed the other users' uid/gid to 0:0. The problem is ...
5
votes
1answer
385 views

I changed /etc/sudoers, and now I can't run as sudo

I messed around with the sudoers file without really knowing what I was doing using this link. Assume I did everything that was in the top answer along with editing it with vim and not visudo. How do ...
2
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0answers
15 views

Why does xdg-open text_file differ from sudo -u me xdg-open text_file?

If I run the following command, the text file opens in my preferred editor (kate). $ xdg-open text_file However, if I try the following, where sparhawk is my username, I get several warnings, and ...
0
votes
2answers
95 views

Does Linux unmount the root partition when the partition is about 80% full? [closed]

Summary Linux seems to be unmounting the root partition, /dev/sda6. I noticed that sda6 is about 80% full. Does Linux unmount this root partition when it gets 80% full, to stop you adding more files? ...
2
votes
1answer
1k views

Vim Error E138: Can't write viminfo file $HOME/.viminfo!

I'm afraid I've run into something rather strange. When I open a file normally, vim README.txt, everything is fine. But upon sudo vim README.txt, the file renders blank, and gives me a E138: Can't ...