programming Linux Kernel modules
Linux kernel modules run in a priviledged space. But what does this mean? Let's find out. First let's program a "hello world" Linux kernel module: create a folder kernel mkdir kernel create a file hello.c: #include <linux/module.h> #include <linux/kernel.h> #include <linux/init.h> MODULE_DESCRIPTION("Insert description"); MODULE_AUTHOR("Insert author"); MODULE_LICENSE("GPL"); static int __init hello_init(void) { printk(KERN_INFO "Hello world\n"); return 0; } module_init(hello_init); create a file Makefile: obj-m += hello.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 run make: make insert the module: sudo insmod hello.ko verify the syslog: sudo dmesg and I see in it the following line that confirms me it works: [49694.489768] Hello world See also https://tldp.org/LDP/lkmpg/2.6/html/hello2.html https://stackoverflow...