linux-insides | A little bit about a linux kernel

by 0xAX Python Version: Current License: Non-SPDX

X-Ray Key Features Code Snippets Community Discussions(5)Vulnerabilities Install Support

kandi X-RAY | linux-insides Summary

linux-insides is a Python library. linux-insides has no bugs, it has no vulnerabilities and it has medium support. However linux-insides build file is not available and it has a Non-SPDX License. You can download it from GitHub.

A little bit about a linux kernel

Support

Quality

Security

License

Reuse

Support

linux-insides has a medium active ecosystem.

It has 28235 star(s) with 3218 fork(s). There are 1350 watchers for this library.

It had no major release in the last 6 months.

There are 26 open issues and 150 have been closed. On average issues are closed in 689 days. There are 6 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of linux-insides is current.

Quality

linux-insides has 0 bugs and 1 code smells.

Security

linux-insides has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

linux-insides code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

linux-insides has a Non-SPDX License.

Non-SPDX licenses can be open source with a non SPDX compliant license, or non open source licenses, and you need to review them closely before use.

Reuse

linux-insides releases are not available. You will need to build from source code and install.

linux-insides has no build file. You will be need to create the build yourself to build the component from source.

Installation instructions are not available. Examples and code snippets are available.

linux-insides saves you 20 person hours of effort in developing the same functionality from scratch.

It has 57 lines of code, 2 functions and 1 files.

It has low code complexity. Code complexity directly impacts maintainability of the code.

Top functions reviewed by kandi - BETA

kandi has reviewed linux-insides and discovered the below as its top functions. This is intended to give you an instant insight into linux-insides implemented functionality, and help decide if they suit your requirements.

Read files from the given path .
Checks whether the given URL is a live URL .

Get all kandi verified functions for this library.

linux-insides Key Features

No Key Features are available at this moment for linux-insides.

linux-insides Examples and Code Snippets

No Code Snippets are available at this moment for linux-insides.

Community Discussions

Trending Discussions on linux-insides

PowerShell function works fine when on its own, but stops working when followed by another function. Why?

spinlock initialization function

Transition of multi-core processor from real mode to protected mode in Linux

What is "section" in "__PCPU_ATTRS" of kernel code?

Android kernel run fanotify without rooting?

QUESTION

PowerShell function works fine when on its own, but stops working when followed by another function. Why?

Asked 2021-Feb-01 at 10:49

The first function will work when on its own.

Function:

...

ANSWER

Answered 2021-Jan-29 at 11:03

Write-Host 
"
Options:

Want to explore a 'Git-README'? Type 1
Want to load a 'Git-Repo'? Type 2
Want to make a new search? Type 3

"

Source https://stackoverflow.com/questions/65948660

QUESTION

spinlock initialization function

Asked 2018-Sep-29 at 12:30

To initialize a spinlock in kernel v4.19-rc5 one must use the spin_lock_init macro defined as follows:

...

ANSWER

Answered 2018-Sep-29 at 12:30

It doesn't need any if statements because it exists for compile time checking.

You can see here that most spinlock operations are defined as macros, so they are not able to restrict type of their argument.

Consider the following example:

Source https://stackoverflow.com/questions/52551594

QUESTION

Transition of multi-core processor from real mode to protected mode in Linux

Asked 2018-Jul-19 at 15:22

I'm trying to learn more about operating systems and I am currently taking a look how the Linux kernel is loaded and initialized.

Thanks to several related questions and this book, I was mostly able to understand how the transition from real mode to protected mode works.

However, the one thing I don't understand is, how and when the rest of the cores are switched to protected mode for multi-core processors (as far as I know, every core has its own set of control registers and the switch seems only to happen once in the booting process).

(I only found this somehow related question with an (short) answer that it is not possible to have two cores in different modes, however there was no source given.) This answer is wrong (thanks to e.g. n.m. in the comments for pointing that out).

Edit: As the comments already pointed out, the kernel might do this later in the initialization process, however when does that happen?

...

ANSWER

Answered 2018-Jul-19 at 15:21

Thanks to the input by sawdust, Peter Cordes and Michael Petch I was able to find the solution to my question (here for Linux v4.16):

Basically the transition from real mode to protected mode happens on every startup of a core (if hotplug is supported, that can happen at any time).

The first time a startup of a secondary processor happens, is during the SMP (Symmetric Multiprocessing) initialization (which is part of the kernel initialization). There, cpu_up() is called for all CPUs present during initialization:

Source https://stackoverflow.com/questions/51417464

QUESTION

What is "section" in "__PCPU_ATTRS" of kernel code?

Asked 2017-Oct-15 at 00:37

I am studying the code in Linux Kernel. Especially, Per-CPU variables.

I have a question about section in the following part.

...

ANSWER

Answered 2017-Oct-15 at 00:37

In this particular case section is a variable attribute. It's a compiler-specific construct, not a symbol name to look for on the site.

Roughly, it just allows one to choose in what exact section shall the object be placed. I.e., normally the compiler (gcc) places the generated objects in data or bss section of the program, but the attribute section will help you to customise that.

A more comprehensive explanation can be found in GCC documentation.

Source https://stackoverflow.com/questions/46750575

QUESTION

Android kernel run fanotify without rooting?

Asked 2017-Mar-28 at 13:01

I would like to implement a fanotify (supported by kernel > 2.6.37 - shipped in Android 5+) interface for the Android x86 - at first for goldfish emulator. I like to use the tool fsmon to start the filesystem monitor (a C program with basic structure to use the fanotify syscalls fanotify_init(2) and fanotify_mark(2)). I extended the fsmon code by own access-permissions. This permissions should be able to edited later by an system app in Android. (For example: I can choose later, which file types are denied)

The problem is following:

"The other big drawback of fanotify is that it currently is root-only (CAP_SYS_ADMIN-only to be more specific). This means that only the root user can request to use the monitoring capabilities provided by fanotify [...]" [source]

A rooted phone is a must have? But is there not another way to run on/after kernel boot the fsmon binary without rooting the device?

My first thought was to execute a file/service after every boot by init.d. But to use it, you need a rooted phone. Then I found this: init.d scripts support:

"If your device is rooted the scripts can be executed using superuser permissions, but normal users can do also."

But I cant't understand how this can work (I didn't test it yet) Could this be a possible solution? For running it on other devices (without installing this app), I need to understand how the app bypass the problem. And init.d gets executed in the user-space, is it even possible to run the monitor there as root?

Next thought was to run a crontab, but same story - rooted phone.

Now I go one level deeper - linking/execute the binary (or the c code) in the kernel boot sequence.. I have to be honest - I'm not a professional kernel developer. I know, that I need the execve systemcall to run a file in kernel. But is my approach right? If this could be the right way, how can I communicate later with the system app? Do I need to create a small "database" from where both sides can access? Which way is the best to access the provided data from the system app? (kernel-userspace-communication: Procfs, Sysfs, Configfs, ...) Where is the right place to start the monitor? (sure - after setting up the filesystem)

Or is it absolutely not possible to use fanotify without rooting the phone?

I would be very happy if someone can give me some tips...

...

ANSWER

Answered 2017-Mar-28 at 13:01

You are trying to use a feature that requires a permission (CAP_SYS_ADMIN or root) that is withheld from user and application processes by design. You either need a phone that provides this capability to designated applications or you need to root the phone. I do not know of any phones phones providing this capability, because it would enable an app to subvert the security of the system.

Source https://stackoverflow.com/questions/43067075

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install linux-insides

You can download it from GitHub.
You can use linux-insides like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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