GoldenOak

GoldenOak / syscall_hooking.c

Created February 1, 2020 13:44

Snippet of system call hooking for the Linux kernel

	/*
	* This is not a whole code, but only a snippet.
	* Some functions is missing.
	*/

	asmlinkage long (*orig_shutdown)(int, int);
	unsigned long *sys_call_table;

	hooking_syscall(void hook_addr, uint16_t syscall_offset, unsigned long sys_call_tabe)
	{

GoldenOak / obtain_syscall_table_by_proc.c

Last active July 2, 2022 10:12

	/*
	* Enable kernel address space which is 4G
	*/
	#define ENTER_KERNEL_ADDR_SPACE(oldfs) \
	({ \
	oldfs = get_fs(); \
	set_fs (KERNEL_DS); \
	});

	/*

GoldenOak / obtain_syscall_table_by_fn.c

Created July 13, 2019 11:29

Linux Kernel Module function for obtaining the syscall table address by seeking through the memory.

	/*
	* run over the memory till find the sys call talbe
	* doing so, by searching the sys call close.
	*/
	unsigned long * obtain_syscall_table_bf(void)
	{
	unsigned long *syscall_table;
	unsigned long int i;

	for (i = (unsigned long int)sys_close; i < ULONG_MAX;

GoldenOak / simple_netfilter_LKM.c

Created January 18, 2019 15:34

	/*****************************************************
	* This code was compiled and tested on Ubuntu 18.04.1
	* with kernel version 4.15.0
	*****************************************************/

	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/netfilter.h>
	#include <linux/netfilter_ipv4.h>