Jason Ayre jasonayre

Algorithm

A secret byte you want to read is stored at inaccessible memory location priv_mem.
The sender triggers an access exception by attempting to read priv_mem.
Due to CPU optimization (out-of-order execution), the load of secret from priv_mem and the use of its value in (4) and (5) below may execute before the exception is triggered.
Calculate an offset into a known array probe by multiplying secret by the width of a cache line (or whatever block size the CPU typically fetches, like a 4096-byte page). This guarantees each of those 256 possible offsets will cache separately.
Load probe[offset], which causes the CPU to cache exactly one chunk of of our array, populating one cache line.
The exception finally triggers, clearing the modified registers...but cached data is not excised.
Iterate over all 256 offsets into probe to find out which one loads fast. You've determined the value of secret.

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Relevant Rails PRs

It is important not to hide composition. It should be done centrally, at the root of the application.

In angular there are 2 different resources we must compose in order to build an application

Using a composition root we map directives, controllers, and services into the injector.
Using routing we compose views from HTML partials and controllers for each different application state.

	es-master:
	image: 'elasticsearch:latest'
	command: 'elasticsearch --network.host=0.0.0.0 --node.master=true --cluster.name=escluster'
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	deployment_strategy: high_availability
	links:
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	elasticsearch:
	image: 'elasticsearch:1.5'
	ports:
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	logstash:
	image: 'logstash'
	command: 'logstash -e "input { syslog { port => 12345 type => "docker" } } output { elasticsearch { hosts => "elasticsearch" } }"'
	expose:
	- '12345/tcp'

	# This file extends and overrides parts of the ActiveAdmin DSL and internals
	# in order to provide support for automatically displaying and editing images,
	# which in our infrastructure are stored as URLs whose column names end in "img".
	# Since this file will be reloaded frequently in the development environment,
	# all operations done at load time (class_eval's, etc.) MUST be idempotent.

	ActiveAdmin::Views::TableFor.class_eval do

	def img_column(col_sym=:img, title="Image")
	column title, sortable: false do \|obj\|

	module Capybara::Poltergeist
	class Client
	private
	def redirect_stdout(to)
	prev = STDOUT.dup
	prev.autoclose = false
	$stdout = to
	STDOUT.reopen(to)

	prev = STDERR.dup

	# This is a program trying to implement Verbal Expressions
	# See this for more info - http://verbalexpressions.github.io/

	def VerEx
	VerExClass.new
	end

	class VerExClass
	attr_accessor :regex

	module ActiveAdminHelper

	def admin_arbre_context
	@admin_arbre_context \|\|= Arbre::Context.new(assigns, self)
	end

	def default_renderer
	case controller.send(:resource_class).name
	when "ActiveAdmin::Page"
	"page"