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What is a module in the Linux kernel?
A Linux kernel module is a piece of compiled binary code that is inserted directly into the Linux kernel, running at ring 0, the lowest and least protected ring of execution in the x86–64 processor.
What do I need to know about Sudo access?
You can also set the permissions on the file so that other users or groups of users can read, modify, or execute the file. Everyone is governed by these permissions. Everyone that is, apart from the superuser, known as root. The root account is a specially privileged account.
Can you run a sudo command as another user?
Its scope has been widened now, and you can use sudo to execute a command as though you were any user. It has been renamed to reflect that new functionality. It is now called “substitute user do.” To use sudo to run a command as another user, we need to use the -u (user) option.
How to control Sudo access on Linux using visudo?
Use visudo to open the sudoers file. Either use this command or the one described above to specify the editor of your choice: Scroll through the sudoers file until you see the definition of the %sudo entry. The percentage sign indicates that this is a group definition and not a user definition.
How to load a kernel module in Java?
To do that we need a code that runs on init. The simplest module must declare 2 functions – on for init and one for exit. The module can be loaded with the kernel on startup (and unloaded on shutdown) or explicitly using insmod command (and rmmod for unload) – this is called a Loadable Kernel Module
Which is an example of a kernel API call?
Some of the kernel API calls can block the current process. Common examples are using a semaphore or waiting for a condition. In this case, the process is put into the WAITING state and another process is running.
How does the Linux kernel support device drivers?
The kernel offers a wide variety of interfaces to support the development of device drivers. This document is an only somewhat organized collection of some of those interfaces — it will hopefully get better over time!