GPUTop: a GPU profiling tool

Intel posted info about a new blog post using GPUTop with Caledon (Intel-flavored Android):

We are excited to bring out a new tutorial for profiling gpu on Android. Gputop exposes many GPU parameters module wise such as frequency, busyness, threads, EU activeness etc. These are very helpful in identifying performance bottlenecks as well as impact of performance improvements on the GPU either through graphics software stack or through the graphics application. If you are learning/ new to gpu, this should attract you even more. Please take a look, try out and feel free to share your feedback.

GPU Top is a tool to help developers understand GPU performance counters and provide graphical and machine readable data for the performance analysis of drivers and applications. GPU Top is compatible with all GPU programming apis such as OpenGL, OpenCL or Vulkan since it primarily deals with capturing periodic sampled metrics. GPU Top so far includes a web based interactive UI as well as a non-interactive CSV logging tool suited to being integrated into continuous regression testing systems. Both of these tools can capture metrics from a remote system so as to try an minimize their impact on the system being profiled. GPUs supported so far include: Haswell, Broadwell, Cherryview, Skylake, Broxton, Apollo Lake, Kabylake, Cannonlake and Coffeelake.

Demystifying Android Physical Acquisition

Demystifying Android Physical Acquisition
May 29th, 2018 by Oleg Afonin

Numerous vendors advertise many types of solutions for extracting evidence from Android devices. The companies claim to support tens of thousands of models, creating the impression that most (if not all) Android devices can be successfully acquired using one method or another. On the other side of this coin is encryption. Each Google-certified Android device released with Android 6.0 or later must be fully encrypted by the time the user completes the initial setup. There is no user-accessible option to decrypt the device or to otherwise skip the encryption. While this Google’s policy initially caused concerns among the users and OEM’s, today the strategy paid out with the majority of Android handsets being already encrypted. So how do the suppliers of forensic software overcome encryption, and can they actually extract anything from an encrypted Android smartphone locked with an unknown passcode? We did our own research. Bear with us to find out![…]

Android bootloader flow documentation published

Alex Deymo notes that the Android project has more documentation on their boot process, and posted about it on the U-Boot mailing list:

“Just an FYI, earlier this month the team spent some time polishing and publishing in documentation about the flows the bootloader goes through in Android, specially true for stock Android like in Pixels phones or other devices based of recent AOSP versions. This documentation includes the interaction between userspace and the bootloader such as the properties userspace expects when booting A/B devices, the whole A/B flow, the bootloader message in the misc partition (BCB), how they interact with the “recovery mode” in Android and much more.

Intel reboots Android-IA as Project Celadon

We are excited to let you know about the refresh of the Android-IA project called Celadon. Celadon is the open sourced Android reference stack for Intel architecture that you are already familiar with, but now with more added to the stack. What started with a few open source drivers support including Mesa i965, I915 Linux Kernel Graphics Driver, and Video Acceleration API last year has since grown into a feature-rich Android stack for IA. Celadon will continue to be dedicated to driving Android support and innovation on IA in addition to providing a place for collaboration. We believe Celadon can help you enhance validation, debug and accelerate development across Android implementations on IA platforms.

GLitch: a remote Rowhammer exploit on ARM Android devices

What is GLitch?

GLitch is one part of our series of Rowhammer attacks. We started by breaking the EDGE browser and the cloud. Then we moved towards Android devices showing how to root them with bit flips. This time we wanted to show that also mobile phones can be attacked remotely via the browser.
Meet GLitch: the first instance of a remote Rowhammer exploit on ARM Android devices. This makes it possible for an attacker who controls a malicious website to get remote code execution on a smartphone without relying on any software bug.
You want to know what makes this attack even cooler? It is carried out by the GPU. This is the first GPU-accelerated Rowhammer attack.[…]


copperheadOS: Samsung missing security features needed for Android Verified Boot

Tweets from CopperheadOS, a security-centric Android-based distribution, are a good source of Android security news, since they’re stretching the boundaries of the open source android release.

postmarketOS: liberating bootloaders and cellular modem firmware of MediaTek phones

Liberating Bootloaders and Cellular Modem Firmware of MediaTek Phones

As a community project, and one that encourages contributors to work on what they like, we have attracted people with a broad range of interests and skill levels. Recently a small hacking group #postmarketOS-lowlevel has emerged, and its masterminds @McBitter and @unrznbl are eager to introduce you to the madness that awaits when digging deeper and deeper in the embedded hardware and software stack. But before we get started, please keep in mind that these are moon shots. So while there is some little progress, it’s mostly about letting fellow hackers know what we’ve tried and what we’re up to, in the hopes of attracting more interested talent to our cause. After all, our philosophy is to keep the community informed and engaged during the development phase! For those new to postmarketOS, we are a group of developers, hackers, and hobbyists who have come together with a common goal of giving a ten year life cycle to mobile phones. This is accomplished by using a simple and sustainable architecture borrowed from typical Linux distributions, instead of using Android’s build system. The project is at an early stage and isn’t useful for most people at this point. Check out the newly-updated front page for more information, the previous blog post for recent achievements, and the closed pull requests to be informed about what’s going on up to the current minute. Let’s dive in!


Google introduces Android Enterprise Recommended program!/results/browse-all/2

CopperheadOS on Android Verified Boot 2.0 docs

oppo_decrypt – Oppo/Oneplus .ops Firmware decrypter

oppo_decrypt – Oppo/Oneplus .ops Firmware decrypter

Tested with “MSMDownloadTool V4.0” for Oneplus 5, Frida 10.4 and Windoze : Enables hidden “readback” functionality : Decrypts any part of the firmware
Based on and python 3.6
Windows only, sorry folks !
Oneplus 5 QD-Loader decryption: ‘python “MsmDownloadTool V4.0.exe” 0 0x92880’
Enable readback mode: ‘python “MsmDownloadTool V4.0.exe”‘


dump_avb_signature: dump/verify Android Verified Boot signature hash

Dump/Verify Android Verified Boot Signature Hash
For researching Android Verified Boot issues
To exploit TZ image verification 🙂

python boot.img

Issues: Might not work with AVB Version 2.0 or higher


Halium for Android-IA/Clovertrail+

Ilya Bizyaev posts on the Intel Android-IA mailing list about working to get Halium port of the ASUS ZenFone5:

I am writing to announce that I am working on a Halium ( port for ASUS ZenFone 5, a Clovertrail+ based phone. Porting Halium base to this Intel platform enables numerous open-source projects, including Ubuntu Touch (, Plasma Mobile (, LuneOS ( and Mer ( to use all of the Clovertrail+ devices for development and testing. I am proud to report that as of now, the Halium build system supports using custom Intel boot tools, and the device boasts a stable 3.10 kernel and Android 7.1-based system build that has Wi-Fi, touch sensor, hardware keys, LEDs and vibrator working.

Full post: archives.

Hmm, I didn’t know about Halium…

From the Halium blog’s initial post:

Over the years, various efforts have been made to bring GNU/Linux to mobile devices (for example Maemo, Meego, Mer, SailfishOS, Ubuntu Touch, Plasma Mobile). They have either achieved their individual goals or are working in direction of achieving them. During the development of such projects it was suggested multiple times that these communities should work together as their ultimate goal is the same. However due to various reasons this never happened in the past. However we believe that it is time to change this situation. Currently distributions like AsteroidOS, LuneOS, Mer, Plasma Mobile, SailfishOS, and Ubuntu Touch have one thing in common that they use the libhybris to interact with the android binary blobs and they also run the various android daemons using different methods. And there is lot of fragementation on how this task is handled even though these parts don’t need to be different as their essential goal is to make use of android binary blobs. Project Halium is the effort by the community which aims to bring the common grounds for different distributions and have a common base which includes the Linux kernel, Android Hardware Abstraction Layer, and libhybris. Project Halium also aims to standardize the middlewares used to interact with the hardware of the device. By having these parts shared, we believe that it will reduce the fragmentation we have currently.[…]



CopperheadOS: business model concerns

CopperheadOS is “A security and privacy focused mobile operating system compatible with Android apps.“.

It appears the company is having problems trying to monetize an open sourced operating system. I hope they can solve things, they’re doing interesting security things with Android.

Android 8.0 and Project Treble

“The Android 8.0 release includes Project Treble, a major re-architect of the Android OS framework designed to make it easier, faster, and less costly for manufacturers to update devices to a new version of Android. Treble is for all new devices launching with Android 8.0 and beyond (the new architecture is already running on the Developer Preview for Pixel phones).[…]”