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

obtain_syscall_table_by_fn.c

/*
 * 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;
			i += sizeof(void *)) {
		syscall_table = (unsigned long *)i;

		if (syscall_table[__NR_close] == (unsigned long)sys_close)
			return syscall_table;
	}
	return NULL;
}