Building and running x86_64 Android Emulator with ecryptfs support

The following steps will guide you to download, build, install and run the x86 Android Emulator image with ecryptfs and EFS-Tools support.

Updated on 21/04/2015 to support Android Lollipop mr1(android-5.1.0_r5 with 3.10 Linux kernel)

Download AOSP

• Install repo client

mkdir ~/bin
PATH=~/bin:$PATH
curl http://commondatastorage.googleapis.com/git-repo-downloads/repo > ~/bin/repo
chmod a+x ~/bin/repo

• Get AOSP source code:

AOSP_TREE=$PWD/AOSP
mkdir $AOSP_TREE
cd $AOSP_TREE
repo init -u https://android.googlesource.com/platform/manifest -b android-5.1.0_r5
repo sync -j8

Download EFS Tools

• Get the source code

git clone https://github.com/catalinionita/Ecryptfs-Tools-for-Android.git $AOSP_TREE/external/efs-tools

• Apply integration patches

cd $AOSP_TREE
external/efs-tools/integration/apply_patches.sh

Build Emulator image

• Setup build environment

Follow the steps in the AOSP wiki to install all required packages for your Linux distribution: http://source.android.com/source/initializing.html#setting-up-a-linux-build-environment

• Build Emulator image

source build/envsetup.sh
lunch aosp_x86_64-eng
make update-api
make -j8

Build kernel with ecryptfs support

• Get kernel source code

git clone https://android.googlesource.com/kernel/goldfish.git $AOSP_TREE/goldfish-kernel
cd $AOSP_TREE/goldfish-kernel
git checkout android-goldfish-3.10

• Create kernel build config

make ARCH=x86_64 x86_64_emu_defconfig

• Edit and add the following to kernel config ($AOSP_TREE/goldfish-kernel/.config) file:

CONFIG_KEYS=y
CONFIG_CRYPTO=y
CONFIG_CRYPTO_ALGAPI=y
CONFIG_CRYPTO_BLKCIPHER=y
CONFIG_CRYPTO_HASH=y
CONFIG_CRYPTO_MANAGER=y
CONFIG_CRYPTO_MD5=y
CONFIG_CRYPTO_ECB=y
CONFIG_CRYPTO_CBC=y
CONFIG_CRYPTO_AES=y
CONFIG_ECRYPT_FS=y

• Disable SELinux support by commenting CONFIG_SECURITY_SELINUX in kernel config ($AOSP_TREE/goldfish-kernel/.config)

• Build kernel

export CROSS_COMPILE=$AOSP_TREE/prebuilts/gcc/linux-x86/x86/x86_64-linux-android-4.9/bin/x86_64-linux-android-
make ARCH=x86_64 CC="${CROSS_COMPILE}gcc -mno-android" bzImage

Start the emulator with the new kernel

 emulator -kernel $AOSP_TREE/goldfish-kernel/arch/x86/boot/bzImage -skin WXGA800-7in -prop fw.max_users=8 -prop fw.show_multiuserui=1 -qemu -m 1024 -enable-kvm

It will start a 7 inch emulator with multi-user support. See all emulator options at http://developer.android.com/tools/help/emulator.html

Check if everything is fine

• Run efs-tools tests:

$AOSP_TREE/external/efs-tools/test/testsuite.sh