Table of Content
It's a mirrored version of the "normal" NAND Flash schematic. Indeed, this board will be soldered in place of the original NAND on the Google Home Mini PCB. Sending various configuration bitstreams to the FPGA. This is done by using the SPI protocol and a couple of additional GPIOs. Manually soldering thin wires to the BGA footprint for breaking out the NAND Flash lines could have been risky because of signal integrity issues. It wouldn't have been a very clean and, more importantly, reliable solution.
Optionally, a NAND Flash can be directly soldered to the board. A FT2232H. This component adds Hi-Speed USB connectivity to the board. Hardware files are available here while the software can be downloaded from here. I made the schematics, Gerber files, and software of NandBug publicly available. The general idea is in fact to make the NAND Flash of the Google Home in-system programmable. It may sound like an over engineered solution and it maybe is.
Google Nest Mini
” to get answers to the most common privacy and security questions. Its in-store longevity could have been due to Google making too many at launch, and you will undoubtedly find a handful on store shelves if you still really want one. That said, the Home Mini does not appear on Best Buy or Target online stores today.
Repeatedly desoldering and soldering back the NAND Flash would have been annoying and could have caused damage to to the PCB. It's the most direct way of achieving code execution on the platform. My goal will be to modify the NAND flash content until I can execute my own code. The Google Home Mini is protected by some kind of secure boot. Bootloader and Kernel are cryptographically verified. To conclude, at first sight, the hardware looks rather annoying to work with and doesn't appear to be very talkative.
Loa thông minh Google nest mini – Google Home mini thế hệ 2
The Google Home Mini launched in October of 2017 and was replaced two years later by the Nest Mini. Despite that, the original affordable speaker has remained available for sale but is now finally out of stock on the Google Store. After 30 minutes there was a very loud siren noise that would wake the dead. It’s very frustrating, I have to use another device for this. I swear this thing has gotten dumber since it was introduced. Least Google could do though if they aren't going to fix the bug is to remove the note from the UI that says they automatically stop.
As demonstrated in the previous articles of this website, I've always been interested into running my own code on consumer devices. Create Routines that allow you to turn on compatible lights, check the weather, play the news, and more with one simple command. Glad to see that I am not the only one with this problem.
Speaker and microphones
Reading through the init.rc script of the initramfs, it appears these two partitions are YAFFS2 partitions. The Linux Kernel version and compilation timestamp can be extracted from strings present in the binary data. Here, the Linux Kernel command line contains the mtdparts configuration variable. This leaks both the names and sizes of all flash partitions.
A few weeks ago we unveiled Google Home Mini, the newest addition to the Google Home family. About the size of a donut, it has all the smarts of the Google Assistant and gives you hands-free help in any room of your house. Starting today, you can grab it online from the Google Store or online or on shelves of Best Buy, Walmart, Target and other stores.
What is the Google Home Mini?
Control it all with just a tap or two – and get to the good stuff faster. The Feed tab highlights important events in your home in one place. Here, you’ll also find ways to get more out of your devices and improve your home setup. TheGoogle Terms of Serviceand supplementalNest Terms of Serviceapply to use of the Google Home app and devices set up via the app.
Both the cache and factory_store partitions are mounted with the noexec flag. Extracting files from this image is just a matter of running the unsquashfs command. For instance, the entire NAND flash layout (i.e. the partitions) can be revealed in the following way.
This source code will be extremely useful in the second article of this series. In 2014, fail0verflow was able to root Chromecast devices with a vulnerability affecting the bootloader. A buffer overflow vulnerability triggered thanks to a special USB peripheral led to a full secure boot bypass. That said, the Home Mini used a micro-USB port instead of a barrel plug connector, and some people preferred that approach.
Below are the specifications for Google Nest and Home speakers and displays . I have sleep sounds for 30 minutes as part of a bedtime routine and it keeps playing all night. The two biggest differences between the Google Home and the Google Home Mini are size and price. The Home Mini is significantly smaller and fades more readily into your home decor, and it also costs a lot less. The Home Mini can also do everything the regular Google Home can do, but the larger device does provide richer sound that does a much better job filling a room. While there are privacy concerns with a device like Google Home Mini that is always listening for a wake word, Google is fairly transparent with what it records.
You can access all of the recordings through your Google account and even turn off recording, although that does prevent some Google Home features from working. While all the executable data is apparently verified, having a total control on all the NAND Flash data does open a rather large attack surface. In order to mount and eventually alter the content of these partitions, I choose to use the exact same YAFFS2 driver that can be found on Google's shared files. The simple file utility can be used against this image to reveal it's in fact a Squashfs filesystem. Please note the Kernel version, sources, initramfs and init.rc file will be useful in the second part of this series of article.
Hence, it's interesting to have a look at what have been discovered against this product. As you might expect, I'm not the only one who has been studying the Google Home devices. Here is a quick summary of what others have discovered at the time of writing of this article.
The app is really good but there are a few things I'd like to see different. You should have the ability to pick a default setting for the live camera status when clicking on a nest cam device. The option to delete a video is too deep in the settings. A long press or a swipe to delete specific clips would be nice.
Another transformation was applied to the data before or after BCH encoding. However, this information alone isn't enough to compute the ECC in the exact same way with the hardware. Each page is very likely using an ECC placed in the OOB area. Further, for two identical "data" pages, the corresponding OOB area will be the same as well. Given this information, a graphical representation of the binary dumped data can quickly help checking whether the OOB section is likely to be used for storing ECC or not.
No comments:
Post a Comment