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Questions tagged [kernel-module]

A kernel module is a run-time loadable object file that is loaded into operating system kernel to add functionality to a running kernel. Examples include device drivers and other kernel items.

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Is it possible to communicate between two linux kernel module via netlink?

As all know, netlink it's user/kernel space communication mechanism. I want to communicate from my kernel module to an another. Another kernel module already has the netlink interface. Is it possible to make connection from kernel module to netlink,…
AlexeyPerevalov
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How to autoload a kernel module in Gentoo Linux?

I want to autoload some kernel modules when it's started. I've read the manual book, but can't help. Now the modules that I want to autoload are vboxdrv vboxnetadp vboxpci vboxnetflt, The modules directory is /lib/modules/3.0.6-gentoo/, the config…
Fei Xue
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Using sk_buff to add an Ethernet frame header

I have a kernel module that captures outgoing Internet traffic(Netfilter hook: LOCAL_OUT) At this hook, there's still no Ethernet header. I built the Ethernet header and it's ready to use, but how can I attach it to the skb so that I can send the…
Fingolfin
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how can I get maximum bandwidth of an interface in linux C?

Let's say I have a machine with 3 NICs; wifi, eth, and 3G. I'm trying to get the ESTIMATED speed (or bandwidth) at which a link CAN transmit at a given time for each of these interfaces and determine which one is the fastest. Again at a given time.…
Varda Elentári
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open() returns with "No such device" error, but there is such a device (linux)

I'm trying to use a somewhat old DAQ, and had to jump through a few hoops to get an old (circa 2004) device driver for it to compile (DTI-DT340 Linux-DAQ-PCI). I've gotten to the point where it compiles, I can load the kernel module, it finds the…
Paul Ivanov
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kernel driver external modules not building completely

I'm adding an external driver module to an android Gingerbread kernel (works similar to Linux). I've done it before and it worked but I have a problem this time. I follow the recipe found in O'Reilly "Linux Device Drivers 3rd edition" which is: in…
Sylvain Huard
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Communication between kernel threads in a linux kernel module

I'm just beginning to learn the tricks of making a kernel module on linux kernel 2.6. What I'm looking to do is have 3 kernel threads, called the slaves, that need to send data to a 4th kernel thread, called master, and receive their respective…
Ram
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Unable to add a simple kernel-module to Yocto image

Goal I want to add a touchscreen driver available in the linux kernel source tree to my Yocto image (The link takes you to goodix.c). I basically need to add it as a kernel module. Solution I follow the Incorporating Out-of-Tree Modules section of…
Micrified
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dump mapped buffer with dd

Into /proc/PID/maps I can see memory that some buffer mapped to kernel module: 44a00000-44b00000 rwxs 00000000 00:01 XXXX /dev/my_module I know that it's logical address , and I want to dump this memory with dd? dd need to get physical memory…
MicrosoctCprog
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Android 10: Update kernel modules

Background: I am working with a Pixel 4, build QQ2A.200501.001.B2, which is Android 10. When I build the kernel from the official sources and flash it, the touchscreen, wlan and other features do not work. I tracked this down to the fact that the…
onetyone
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module debugging through KGDB

I want to debug my kernel module. For that I am trying to put a breakpoint at do_one_initcall in kernel/module.c just before my init_module gets called but it's displaying Cannot access memory at address 0x802010a0 Below is the Makefile which I…
cp5662
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Making/Building a kernel module inside a docker container

I currently have my host system running Mac OS with docker. I have my Mac OS host system spawning a docker container. The spawned docker container is currently running ubuntu:19.10 I am trying to build a kernel module inside the docker container…
jremi
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Allocating huge pages in kernel modules

I'm looking for a way to allocate huge pages (2M or 1G) in a kernel module (I'm using kernel version 4.15.0). In user space, I can mount the hugetlbfs file system, and then allocate huge pages using mmap (see, e.g.,…
andreas
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Memory Isolation in new Linux Kernels, or what?

This my module perfectly hijacks user's console: https://pastebin.com/99YJFnaq And it was Linux kernel 4.12, Kali 2018.1. Now, I've installed the latest version of Kali - 2019.1. It uses kernel 4.19: Linux kali 4.19.0-kali1-amd64 #1 SMP Debian…
lfshyrtj
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Android LowMemoryKiller Failing to Kill Webviews

For quite some time now, I've been trying to debug major bursts of lag/stuttering on my device, when playing heavy games. After analyzing my logcat a lot, I feel I've identified what is causing the spikes of unbearable lag. The following error shows…
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