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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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Android adb command to get device driver in device?

In android device, I am searching command or way to check all kernel modules/drivers in current device. so, can we get all kernel module list from command line ? Command to list all kernel module/driver for static + run time modules. like lsmod
R_K
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Unable to compile kernel module: no .ko file output

I've built an android kernel (source code), now I'm trying to cross-compile a kernel module for it, v4l2loopback to be precise. I've used this toolchain to build the kernel (kernel version is 4.9). Here on github you can see that someone actually…
winwin
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Unknown symbol devm_input_allocate_polled_device

Trying to load kernel module on Raspberry Pi 4. root@raspberrypi:/home/pi# uname -r 5.4.79-v7l+ root@raspberrypi:/home/pi# insmod i2c_rpi4_accel.ko insmod: ERROR: could not insert module i2c_rpi4_accel.ko: Unknown symbol in module Trace: [ …
Alex F
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How to trigger fops poll function from the kernel driver

I am working on a kernel driver which logs some spi data in a virtual file using debugfs. My main goal is to be able to "listen" for incomming data from userspace using for example $ tail -f /sys/kernel/debug/spi-logs which is using select to wait…
Mihai
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sysfs_store sscanf u8 from buffer not working correctly

// userspace uint8_t value = 5; write (fd, (const char *)&value, 1); // kernel driver static ssize_t sysfs_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { u8 val; sscanf(buf, "%hhu" , &val); //…
ruke
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How to Send a Value to Another Driver's Sysfs Attribute

This is all in Linux 4.14.73. I'd upgrade if I could but I cant. I'm trying to trigger an LED flash in a standard LED class instance from another kernel space driver. I know all about the "bad form" of not accessing files from Kernel Space so I…
jemiah
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kernel module - how to make that my module upload automatically at boot time?

I'm using a centos 8. I made a module where every time the module goes up it prints "Hello World" and every time the module goes down it prints "Goodbye". How do I make the module load automatically during boot? #include #include…
Jonatan Haish
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Perf cannot use symbol from kernel module

I want to trace a kernel module I've written using Intel PT but I can not get perf to recognize symbols from my kernel modules. For the sake of simplicity, I tried tracing a module that periodically prints a string to the log, using perf record -e…
Can Cebeci
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Build kernel module in CentOS 7 with changed API

I write NIC module driver and implement it base functions like ndo_open, ndo_stop, ndo_start_xmit... Sometimes Linux Kernel API is changed in the recent versions. So macro like LINUX_VERSION_CODE helps adopt code of the module to recent Linux Kernel…
Yurij Goncharuk
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What is causing this error: SSE register return with SSE disabled?

I'm new to kernel development, and I need to write a Linux kernel module that performs several matrix multiplications (I'm working on an x64_64 platform). I'm trying to use fixed-point values for these operations, however during compilation, the…
kelos
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How can I prepare a Linux source tree so an external module can be compiled against it?

I am keeping a WIFI driver alive by patching compilation errors for new Kernel versions. I can build it against a source tree, so I do not have to boot the kernel for which I want to fix it. Unfortunately for this I have to fully compile the entire…
Max Görner
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Procfs file vs Device file in Embedded Linux driver development

i am planning to develop a device driver for a custom board. as my research went on , I encounter two main ways to develop a driver . the device file which uses structures and another one was using pro which i can work with registers directly ,…
S2G
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Linux kernel module programming - hooking to sys_wait4 system call

I try to do hooking to system call sys_wait4 and every time I try to do rmmod to module the kernel crashes. This is my code. void **sys_call_table;//pointer for the system call's table typedef asmlinkage long (*sys)( struct pt_regs * ); sys…
Jonatan Haish
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Make via Makefile fails but from command line is successful

I'm trying to build an out-of-tree module against a downloaded kernel tree. My Makefile looks like this: obj-m += userModule.o ARCH := arm CC := arm-linux-gnueabihf- KERN_DIR := /home/user/Downloads/beaglebone-linux-5.10/ CD :=…
Yaniv G
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Is there any way to detect packet direction in the PRE_ROUTING hook point

I'm trying to create a firewall in C as a linux kernel module. as part of the firewall, I've implemented a hook function which performs packets inspection inside the PRE_ROUTING hook point. In the hook function I need to deduce the packet direction…
Amit Gabay
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