DJ Sunshine dev-zzo

Global pointer variables misused in C programs

TL;DR: load global variables into local ones before use.

I've spotted a quite widespread misuse of global pointer variables. The issue is easily demonstrated by the following simplified example.

struct some_type_t {
    int a1;
    int a2;

	#include <stdio.h>
	#include <malloc.h>

	struct _perceptron_t {
	size_t weights_count;
	float thfunc_param;
	float weights[1];
	};
	typedef struct _perceptron_t perceptron_t;

	"""
	GitHub API v3 Wrapper

	Ref: https://developer.github.com/v3/git/

	"""

	import base64
	import json
	import requests

	#include <stdio.h>
	#include <malloc.h>
	#include <math.h>
	#include <stdlib.h>

	//
	// Generic N-layer neuron network code (using unipolar sigmoid activation function)
	//

	// Data type to operate on; typically double.

	<?xml version="1.0"?>
	<root xmlns="urn:schemas-upnp-org:device-1-0">
	<specVersion>
	<major>1</major>
	<minor>0</minor>
	</specVersion>
	<URLBase>http://172.16.90.254:49152</URLBase>
	<device>
	<deviceType>urn:schemas-upnp-org:device:InternetGatewayDevice:1</deviceType>
	<friendlyName>Cisco VPN Router</friendlyName>

	#!/usr/bin/python
	"""Utility functions to work with character patterns."""

	__lower_alpha = 'abcdefghijklmnopqrstuvwxyz'
	__upper_alpha = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
	__numeric = '0123456789'

	def pattern_create(length, charsets=None):
	"""Generates a unique, nonrepeating pattern of a given length.

	MS16-005 (CVE-2016-0009) Win32k Remote Code Execution Vulnerability info

	just look at PFTOBJ::bUnloadAllButPermanentFonts

	"""

	SAGEM ROUTER FAST 3304/3464/3504 - telnet root password generator.

	Work based on: http://1337day.com/exploit/16687

	"""

	import sys

	//
	// copyright (c) 2014 by [email protected]
	//______________________________________________________________________________
	//
	`timescale 1ns / 1ns

	module vm80a
	(
	input pin_clk, // global module clock (no in original 8080)
	input pin_f1, // clock phase 1 (used as clock enable)