headius

Algorithm

1. A secret byte you want to read is stored at inaccessible memory location priv_mem.
2. The sender triggers an access exception by attempting to read priv_mem.
3. 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.
4. 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.
5. Load probe[offset], which causes the CPU to cache exactly one chunk of of our array, populating one cache line.
6. The exception finally triggers, clearing the modified registers...but cached data is not excised.
7. Iterate over all 256 offsets into probe to find out which one loads fast. You've determined the value of secret.

ayamflow

// Add on element with overflow
-webkit-mask-image: -webkit-radial-gradient(white, black);

miner

#!/bin/bash
# my git difftool, calls FileMerge with project as -merge target
# better than using opendiff
#
# cd to your project dir and and run difftool like this:
#   git difftool -d -x gdiff

# find top level of git project
dir=$PWD
until [ -e "$dir/.git" ]; do

bastman

Docker - How to cleanup (unused) resources

Once in a while, you may need to cleanup resources (containers, volumes, images, networks) ...

delete volumes

// see: https://github.com/chadoe/docker-cleanup-volumes

$ docker volume rm $(docker volume ls -qf dangling=true)

$ docker volume ls -qf dangling=true | xargs -r docker volume rm

JeffreyWay

<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Request;
use Illuminate\Http\Response;
use Symfony\Component\DomCrawler\Crawler;

class PjaxMiddleware

tillkruss

<?php

namespace App\Redis;

use Redis;
use Illuminate\Redis\Database as RedisDatabase;
use Illuminate\Contracts\Redis\Database as DatabaseContract;

class Database extends RedisDatabase implements DatabaseContract
{

tortuetorche

<?php
namespace Helper;

// Select2 helpers for the jQuery based replacement for select boxes.
// See: http://select2.github.io/select2
// Author: Tortue Torche <[email protected]>
// License: MIT
//
// Installation:
// * Put this file in your 'tests/_support/Helper' directory

oneohthree

echo "$STRING" | iconv -t ascii//TRANSLIT | sed -r s/[^a-zA-Z0-9]+/-/g | sed -r s/^-+\|-+$//g | tr A-Z a-z

JonoB

Regex search and replace for form helpers as follows:

Search:
\{\{ (Form\:\:.+) \}\}

Replace:
{!! $1 !!}

pbojinov

Two way iframe communication

The main difference between the two pages is the method of sending messages. Recieving messages is the same in both.

Parent

Send messages to iframe using iframeEl.contentWindow.postMessage Recieve messages using window.addEventListener('message')

iframe