codeslinger

L1 cache reference                            0.5 ns
Branch mispredict                             5   ns
L2 cache reference                            7   ns             14x L1 cache
Mutex lock/unlock                            25   ns
Main memory reference                       100   ns             20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy              3,000   ns
Send 1K bytes over 1 Gbps network        10,000   ns    0.01 ms
SSD random read                         150,000   ns
Read 1 MB sequentially from memory      250,000   ns    0.25 ms
Round trip within same datacenter       500,000   ns    0.5  ms

codeslinger

require 'oauth_util.rb'
require 'net/http'

o = OauthUtil.new

o.consumer_key = 'examplek9SGJUTUpocjZ5QjBJmQ9WVdrOVVFNHdSR2x1TkhFbWNHbzlNQS0tJnM9Y29uc3VtkZXJzZWNyZXQmeD0yYg--';
o.consumer_secret = 'exampled88d4109c63e778dsadcdd5c1875814977';

url = 'http://query.yahooapis.com/v1/yql?q=select%20*%20from%20social.updates.search%20where%20query%3D%22search%20terms%22&diagnostics=true';

codeslinger

def run_pg_fouine():
    info = host_info[env.host_string]
    db_name = info.tags.get('Name')
    sudo('perl -pi -e "s/log_min_duration_statement = .*/log_min_duration_statement = 0/" /etc/postgresql/9.*/main/postgresql.conf')
    sudo('/etc/init.d/postgresql reload')
    time.sleep(30)
    sudo('perl -pi -e "s/log_min_duration_statement = .*/log_min_duration_statement = 500/" /etc/postgresql/9.*/main/postgresql.conf')
    sudo('/etc/init.d/postgresql reload')
    run('tail -n 100000 /var/log/postgresql/postgresql-9.*-main.log > /tmp/pgfouine.txt')
    run('gzip -f /tmp/pgfouine.txt')

codeslinger

#!/usr/bin/env sh

##
# This is script with usefull tips taken from:
#   https://github.com/mathiasbynens/dotfiles/blob/master/.osx
#
# install it:
#   curl -sL https://raw.github.com/gist/2108403/hack.sh | sh
#

codeslinger

If you don't care about the explanation, scroll down to find the code, it's 50 some odd lines and written by someone who doesn't know any better. You have been warned.

What it does

This is a very simple proof of concept jitting RPN calculator implemented in python. Basically, it takes the source code, tokenizes it via whitespace, and asks itself one simple question: am I looking at a number or not?

First, let's talk about the underlying program flow. Pretend that you are a shoe connoisseur with a tiny desk. You may only have two individual shoes on that desk at any one time, but should you ever purchase a new one or get harassed by an unruly shoe salesman without realizing that you have the power to say no (or even maybe?), you can always sweep aside one of the two shoes on the desk (the one on the right, because you're a lefty and you feel that the left side is always superior) onto the messy floor, put the other shoe on the right hand side, and then place your newly acquired shoe in

codeslinger

#!/usr/bin/env ruby

# giftube – Generates an animated gif from a YouTube url.
#
# Usage:
#
#   giftube [youtube url] [minute:second] [duration]
#
#   ex.
#

codeslinger

//
//  Created by Michael Petrov on 12-02-23.
//  Copyright (c) 2012 TenthBit Inc. All rights reserved.
//  http://michaelpetrov.com (petrov.michael@gmail.com)
//
//
//  This solution performs a timing attack on the fork system call. By monitoring the process closely
//  it is possible to discover where the fork likely happened. With some basic heuristics, it's possible
//  to infer where the wrong character is. With very minor brute force searching it becomes very easy
//  to find the password one letter at a time.

codeslinger

Stripe CTF - Work Notes
mpetrov (petrov.michael@gmail.com)

These notes are very rough. They should give a general idea of how each level was solved.

---- LEVEL 01 (login: e9gx26YEb2) -----
Solution: modifying PATH env variable
Password: kxlVXUvzv

date.c

codeslinger

import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.StandardSocketOptions;
import java.nio.ByteBuffer;
import java.nio.channels.CancelledKeyException;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;

codeslinger

(def migrations (sorted-map
                 ;; Migrations are numbered by integer values to explicitly document them

                 1 {
                    :doc "Foo Table"
                    :up  (fn []
                            (create-table
                             :Foo
                             [:id :int "PRIMARY KEY" "NOT NULL GENERATED ALWAYS AS IDENTITY"]
                                        ; store a JSON blob in here for the screening record