Issue

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.

Solution

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.

Answered By - YanBir

Answer Checked By - Clifford M. (WPSolving Volunteer)

Saturday, February 26, 2022

[SOLVED] insmod: ERROR: could not insert module HelloWorld.ko: Operation not permitted

Issue

Solution