zyedidia

Compiler Requirements

When building for the aarch64_lfi target, the compiler must restrict use of the instruction set to a subset of instructions, which are known to be safe from a sandboxing perspective. To do this, we apply a set of simple rewrites at the assembly language level to transform standard native AArch64 assembly into LFI-compatible AArch64 assembly.

These rewrites (also called "expansions") are applied at the very end of the

zyedidia

Vagrant.configure("2") do |config|
  config.vm.box = "ubuntu/focal64"
  config.vm.synced_folder ".", "/vagrant"
  config.vm.synced_folder ".", "/home/vagrant/sync"

  config.vm.provider "virtualbox" do |vb|
    vb.memory = "4096"
    vb.cpus = 2
    vb.customize ["modifyvm", :id, "--uart1", "0x3F8", "4"]
    vb.customize ["modifyvm", :id, "--uartmode1", "file", File::NULL]

zyedidia

Keybase proof

I hereby claim:

• I am zyedidia on github.
• I am zyedidia (https://keybase.io/zyedidia) on keybase.
• I have a public key ASAIYsf3bp6frnnSMEtFQvJuEVGceRR8xpDQR4ALqbNP5wo

To claim this, I am signing this object:

zyedidia

Text Encoding

How are text files encoded, and what are the pros and cons of different encodings? This document introduces the ASCII and Unicode encodings to answer these questions. Some short pieces of Go code are provided which you can run yourself to see how strings are being encoded. Go is used because it has built-in support for Unicode, but you should be able to follow without any knowledge of Go.

ASCII

zyedidia

#!/usr/bin/env bash
set -e

OS=$1
INSTALLDIR=${2:-"."}

function githubLatestTag {
    finalUrl=`curl https://github.com/$1/releases/latest -s -L -I -o /dev/null -w '%{url_effective}'`
    echo "${finalUrl##*v}"
}