arq5x

# compile
$ g++ zlib-example.cpp -lz -o zlib-example

# run
$ ./zlib-example
Uncompressed size is: 36
Uncompressed string is: Hello Hello Hello Hello Hello Hello!

----------

aras-p

// Just before switching jobs:
// Add one of these.
// Preferably into the same commit where you do a large merge.
//
// This started as a tweet with a joke of "C++ pro-tip: #define private public",
// and then it quickly escalated into more and more evil suggestions.
// I've tried to capture interesting suggestions here.
//
// Contributors: @r2d2rigo, @joeldevahl, @msinilo, @_Humus_,
// @YuriyODonnell, @rygorous, @cmuratori, @mike_acton, @grumpygiant,

dergachev

Why You Can't Un-Root a Compromised Machine

Let's say somebody temporarily got root access to your system, whether because you "temporarily" gave them sudo rights, they guessed your password, or any other way. Even if you can disable their original method of accessing root, there's an infinite number of dirty tricks they can use to easily get it back in the future.

While the obvious tricks are easy to spot, like adding an entry to /root/.ssh/authorized_keys, or creating a new user, potentially via running malware, or via a cron job. I recently came across a rather subtle one that doesn't require changing any code, but instead exploits a standard feature of Linux user permissions system called setuid to subtly allow them to execute a root shell from any user account from the system (including www-data, which you might not even know if compromised).

If the "setuid bit" (or flag, or permission mode) is set for executable, the operating system will run not as the cur

ccbrown

#include <stdio.h>

void DumpHex(const void* data, size_t size) {
	char ascii[17];
	size_t i, j;
	ascii[16] = '\0';
	for (i = 0; i < size; ++i) {
		printf("%02X ", ((unsigned char*)data)[i]);
		if (((unsigned char*)data)[i] >= ' ' && ((unsigned char*)data)[i] <= '~') {
			ascii[i % 16] = ((unsigned char*)data)[i];

ipbastola

Safest way to clean up boot partition - Ubuntu 14.04LTS-x64, Ubuntu 16.04LTS-x64

Reference

Case I: if /boot is not 100% full and apt is working

1. Check the current kernel version

$ uname -r 

shoghicp

<?php

/**
 * Minecraft: Pocket Edition header extractor
 *  
 * This tool needs objdump (and objdump-multiarch + arm variants) installed on the current system
 * 
 */

const VERSION = "0.0.1";

dktapps

MCPE 1.0 Network Chunk specification

Note: the accuracy of this specification may be flawed. This specification is believed to be correct as of beta 1.0.0.7, but its accuracy is by no means guaranteed.

Basic changes

Biome colour removal

The ability to set biome colours disappeared this update, which is a shame. The old method using biome IDs is back; colours and gradients are now handled automatically client side. While this is a bonus for PocketMine in the way that biome colours in Anvil worlds will now work correctly again, it's a shame to see that capability disappear.

codedokode

<?php 
/**
 * Простой прокси-сервер на PHP для изучения и модификации данных, 
 * передаваемых между браузером и сторонним сервером.
 * 
 * Запуск: 
 *
 * указать URL сайта в $base
 * php -S 127.0.0.1:9001 proxy.php
 *

FergusInLondon

/**
 * snoopy.c - Snoop on another tasks memory.
 *  Fergus In London <fergus@fergus.london>
 *
 * This is a pretty basic demo of the process_vm_readv syscall, a syscall which
 *  provides a nicer interface than ptrace for accessing memory used by another
 *  task.
 *
 * To play with simply use `ps` to get a PID for the process you'd like to snoop
 *  on, and `pmap` for the relevant memory address.

dktapps

{
  "geometry.humanoid": {
    "bones": [
      {
        "name": "body",
        "pivot": [ 0.0, 24.0, 0.0 ],
        "cubes": [
          {
            "origin": [ -4.0, 12.0, -2.0 ],
            "size": [ 8, 12, 4 ],