I am trying to learn linux and kernel development.
I am able to build the module but am unable to load it.
HelloWorld.c
/*
* hello-1.c - The simplest kernel module.
*/
#include <linux/module.h> /* Needed by all modules */
#include <linux/kernel.h> /* Needed for KERN_INFO */
int init_module(void)
{
printk(KERN_INFO "Hello world 1.\n");
/*
* A non 0 return means init_module failed; module can't be loaded.
*/
return 0;
}
void cleanup_module(void)
{
printk(KERN_INFO "Goodbye world 1.\n");
}
And here is my make file:
KERNEL_SOURCE := /lib/modules/$(shell uname -r)/build
PWD := $(shell pwd)
obj-m += HelloWorld.o
all:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
clean:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
while doing insmod for loading the module permission is getting denied. I tried even doing it with root and also with modprobe, but no use.
I also tried Link but issue still the same.
Hope i get some help. I am using ubuntu 18.04LTS.
insmod command in Linux systems is used to insert modules into the kernel. Linux is an Operating System which allows the user to load kernel modules on run time to extend the kernel functionalities.
The insmod command is used to insert modules into the kernel. Kernel modules are usually used to add support for new hardware (as device drivers) and/or filesystems, or for adding system calls. This command inserts the kernel object file (. ko) into the kernel.
insmod is similar to modprobe: it can insert a module into the Linux kernel. Unlike modprobe, however, insmod does not read its modules from a set location, automatically insert them, and manage any dependencies. insmod can insert a single module from any location, and does not consider dependencies when doing so.
Use the modprobe command to add or remove modules on Linux. The command works intelligently and adds any dependent modules automatically. The kernel uses modprobe to request modules. The modprobe command searches through the standard installed module directories to find the necessary drivers.
So I had the same problem and this worked for me:
You need to disable Secure Boot using mokutil use the first answer in this link
Run the insmod command via sudo.
Good Luck.
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