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© 2018 Arm Limited © 2018 Arm Limited

TZMP-1 Software

Reference Implementation

• Ken Liu

• 2018-Mar-12

2 © 2018 Arm Limited 2 © 2018 Arm Limited

Content

•DRM Applications and Secure Video Path

• Regular Secure Video Path Design with Trustzone• TZMP1 Design Concepts• Reference Implementation Details

3 © 2018 Arm Limited 3 © 2018 Arm Limited

DRM Protocols

Video Path

General Process of DRM

Key Exchange

Authorizing

Networking

-+Decrypt/DecodeEncode/Encrypt

Casting

Encoded ContentEncrypted Content

4 © 2018 Arm Limited 4 © 2018 Arm Limited

Ideal Model of Secure Video Path

- Decrypt

Decode

Composite

+Secured Environment

Encrypted Content

Encoded Content Decoded Frame

5 © 2018 Arm Limited 5 © 2018 Arm Limited

Content

• DRM Applications and Secure Video Path

•Regular Secure Video Path Design with Trustzone

• TZMP1 Design Concepts• Reference Implementation Details

6 © 2018 Arm Limited 6 © 2018 Arm Limited

Arm Trustzone

Secure World

Non-Secure World

Non-Trusted Apps

Tursted OS

Trused OS

Trusted Application

Hardware isolatedExecution Environment

7 © 2018 Arm Limited 7 © 2018 Arm Limited

Regular Design with TrustZone

- Decrypt Decode

Composite+

Secure World

Non-Secure World

Receive

8 © 2018 Arm Limited 8 © 2018 Arm Limited

Secure World

Issues of Regular Design

Non-Secure OS

Media

Framework

Video Driver

Graphics Component

GPUDriver

CompositorDisplayDriver

Video Component

Secure OS

Video Driver

Graphics Component

GraphicsDriver

CompositorDisplayDriver

Video Component Video Driver

Video Component

GraphicsDriver

Graphics Component

DisplayDriver

Compositor

Porting ?

Non-Secure World

Mature multimediaframeworks inNon-Secure OS

Lack of APIRuntime

more attack interfaces

9 © 2018 Arm Limited 9 © 2018 Arm Limited

SecureMemory

Protected

Memory

Non-Secure Memory

Protected

Memory

Protect Content in Non-Secure World

- Decrypt

Decode

Composite+

Could we protect content innon-secure world to avoid

much changes?

Restrict accessing intosingle direction

10 © 2018 Arm Limited 10 © 2018 Arm Limited

Content

• DRM Applications and Secure Video Path• Regular Secure Video Path Design with Trustzone

•TZMP1 Design Concepts

• Reference Implementation Details

11 © 2018 Arm Limited 11 © 2018 Arm Limited

Protected Memory and Secured Playback

ProtectedVPU

Non-SecureVPU

ProtectedGPU

Non-SecureGPU

Non-Secure CPU

Non-Secured Bitstream

Secure Bitstream

DisplayController

RWRW

Decryptor

RO

WORW RW

RO

RO

Protected Memory

Non-Secure Memory

• Secure Bitstream could only be accessed by ‘Protected’ hardware components• Non-Secure Bitstream could only be accessed by Non-Secure hardware components

• Display controller could read both types of bitstreams• Mention the word ‘Protected’ – leads to Protected Memory and Protected Mode of HW

12 © 2018 Arm Limited 12 © 2018 Arm Limited

Hardware Architecture of TZMP1

CortexA

CortexA

CortexA

CortexA

CCI – 5xx Interconnect

GPU

NIC-400 Interconnect

VPU Display

TZC-400

Memory

NSAID_CPU

NSAID_GPU_PROTECTEDNSAID_REE

NSAID_VIDEO_PRIVATENSAID_VIDEO_PROTECTEDNSAID_VIDEO_OUTBUFNSAID_REE

NSAID_DP_PROTECTED

NSAID

NSAID

NSAID

13 © 2018 Arm Limited 13 © 2018 Arm Limited

Firewall of Accessing - Arm Trustzone Controller 400

• Each non-secure memory accessing hardware is assigned with a Non-Secure Access ID (NSAID)

• TZC-400 checks NSAID and region permissions to decide access availability

• Total 8 regions and 16 NSAIDs are supported in TZC-400

• Secure accessing is also checked by TZC-400

Region Ranges NSAID 1 NSAID 2 … NSAID 16 Secure Access

0 All Memory RW Configurable RW Configurable RW Configurable RW Configurable

1 Configurable RW Configurable RW Configurable RW Configurable RW Configurable

2 Configurable RW Configurable RW Configurable RW Configurable RW Configurable

3 Configurable RW Configurable RW Configurable RW Configurable RW Configurable

4 Configurable RW Configurable RW Configurable RW Configurable RW Configurable

5 Configurable RW Configurable RW Configurable RW Configurable RW Configurable

6 Configurable RW Configurable RW Configurable RW Configurable RW Configurable

7 Configurable RW Configurable RW Configurable RW Configurable RW Configurable

TZC-400

Memory

NSAID

Comp

14 © 2018 Arm Limited 14 © 2018 Arm Limited

Content

• DRM Applications and Secure Video Path• Regular Secure Video Path Design with Trustzone• TZMP1 Design Concepts

•Reference Implementation Details

15 © 2018 Arm Limited 15 © 2018 Arm Limited

Platform and Software Components

Component Description

Board Juno-r2 + 2 x Logictile

Non-SecureOS

Androidlsk-4.4-armlt Kernel

Secure OS OPTEE OS

Boot Arm-tf

Media IP Arm Mali V550 G71 DP650

DRM Clearkey / Widevine

16 © 2018 Arm Limited 16 © 2018 Arm Limited

Overall Reference Implementation

Hardware

Media Framework SurfaceFlinger

DRM Plugin OMX.decoder.secure

OMX.decoder

OP-TEE OS (TEE)

Crypto TA

TZC-400NSAID PROT NSAID_PUB

VPUNSAID_PR

OTNSAID_PU

B

GPU

ProtectedSurface

Surface

EncryptedBitstream

Protected Memory DecryptedDecode

dDecode

dDecoded

ClearBitstream

ClearBitstream

Decoded

Decoded

Decoded

ExoPlayer

Drivers

Non-Secure Memory

Crypto CA

DPUNSAI

D

17 © 2018 Arm Limited 17 © 2018 Arm Limited

Required Software Modifications

Hardware

Media Framework SurfaceFlinger

OMX.decoderOMX.decoder.secu

re

OP-TEE OS (TEE)

Crypto TA

TZC-400

NSAID PROT NSAID_PUB

VPUNSAID_PR

OTNSAID_PU

B

GPU

SurfaceProtected

Surface

ExoPlayer

Drivers

SGL TA

SGL CA Gralloc

DRM Plugin

Crypto CA

ION

TZC400 Setup

DPUNSAI

D

18 © 2018 Arm Limited 18 © 2018 Arm Limited

Memory Regions

Android (Linux)

Kernel Managed ION::UNMAPPED HEAP ION::CARVEOUTTEEPARAM

X

Memory Regions

Non-SecureMemory

SECUREFIRMWARE

SECUREBITSTREAM

SECUREFRAME

TEEPARAM

SecureMemory

OPTEE OS X Secure Data PathX TEE

PARAMRuntime

19 © 2018 Arm Limited 19 © 2018 Arm Limited

Secure VPU Firmware Loading

Secure Gadget Library (SGL CA)

OP-TEE OS

SGL TA

Secure Firmware

Firmware

• Mandatory for firmware based decoder

• Unnecessary for non-firmware based decoder

• SDP Usage

Non-SecureMemory

SECUREFIRMWARE

SECUREBITSTREAM

Hardware

NSAID_PRIV NSAID_PUB

VPU

20 © 2018 Arm Limited 20 © 2018 Arm Limited

Adopt DRM Crypto

DRM Plugin

OP-TEE OS

Crypto TA

EncryptedBitstream

Decrypted

• Decrypt in OPTEE OS

• Put result into protected memory

• Take advantage SDP of OPTEE OS SDP

Non-SecureMemory

SECUREFIRMWARE

SECUREBITSTREAM

21 © 2018 Arm Limited 21 © 2018 Arm Limited

Adopt Secure Decoder

Hardware

Android

Media Framework

OMX.decoder.secure

OMX.decoder

NSAID_PROT NSAID_PUB

VPU

DecryptedDecode

d

ExoPlayer

Drivers

SECUREFIRMWARE

SECUREBITSTREAM

SECUREFRAME

‘Secure Video Path’ in Android

Is DRM required ‘Secure Codec’ ?

Is ‘Secure Codec’ available ?

Setup Secure Video Path

Choose ‘Secure Codec’ component

Apply Protected Surface for output

22 © 2018 Arm Limited 22 © 2018 Arm Limited

Graphics and Display

Hardware

SurfaceFlinger

NSAID_PROT

NSAID_PUB

GPU

ProtectedSurface

Surface

Decoded

Decoded

• GPU and Display calls gralloc for surface buffers

• Gralloc allocates memory from specified buffer due to flags

• Call ION APIs for protected buffer

Drivers

SECUREFRAME

DPUNSAI

D

23 © 2018 Arm Limited 23 © 2018 Arm Limited

ReferencesComponents Repository

1 Workspace To be upstreamed in April

2 Arm-tf https://github.com/ARM-software/arm-trusted-firmware (Upstreaming)

3 OPTEE OS https://github.com/OP-TEE/optee_os (Done)

4 Android manifest To be upstreamed in April

5 Secure Gadget Library Upstreaming in linaro private repository

6 Gralloc https://developer.arm.com/products/software/mali-drivers/android-gralloc-module

7 Multimedia IP Contact Arm support

8 Linux and DTS https://git.linaro.org/landing-teams/working/arm/kernel-release.git(Upstreaming)

9 Arm Connected Community Page

Planed to be done by ~April

2424

Thank YouDankeMerci谢谢ありがとうGraciasKiitos감사합니다ध यवादתודה

© 2018 Arm Limited 2424

Thank YouDankeMerci谢谢ありがとうGraciasKiitos감사합니다ध यवादתודה

© 2018 Arm Limited