You don’t need expensive equipment for VoLTE/VoWiFi research! Learn how VoLTE/VoWiFi works by setting up your own Wi-Fi calling server with free software.
I’m learning how VoWifi/VoLTE works by trying three experiments:
I tested Facebook’s new Novi digital wallet and found evidence for upcoming features, such as a debit card to access Novi balance, third-party linking with QR codes, and a way to buy Bitcoin directly from the app.
I ran command line macOS tools, such as Bash and Geekbench, on a jailbroken iPhone by replacing iOS’s dyld shared cache (all of iOS’s code) with macOS’s. However, graphical apps will never work: macOS’s WindowServer won’t start, since iOS’s drivers are too different.
Safari’s Web Inspector has an option (Develop -> Disable Cross Origin Restrictions) to disable the same-origin policy for debugging. This allows, for example, the
fetchAPI to load any page, not limited to the same domain or CORS-enabled domains.
macOS 11.0/iOS 14.2/iOS 12.4.9 fixed an issue where
port->ip_specialreply, causing it to overwrite
ip_sync_inheritor_port. This can be used to reboot the system with a zone check error, but I can’t figure out what else this can do.
I booted the arm64e kernel of macOS 11.0.1 beta 1 kernel in QEMU up to launchd. It’s completely useless, but may be interesting if you’re wondering how an Apple Silicon Mac will boot.
Here’s a script that modifies Xcode’s macOS SDK to build for ARM. You can use this to find code that won’t compile on ARM, to get a head start on porting before Apple releases Xcode for an ARM Mac.
I tricked m3.euagendas.org, the viral third-party Twitter account analysis website, into thinking I’m 40 years old: it only took 78 lines of code to generate an adversarial input against its neural network, using Foolbox, PyTorch, and Python.
I built a proof-of-concept tool to render SwiftUI to HTML. While I’m not intending to turn it into a full UI framework, I still learned plenty along the way: I learned how to use Swift’s generics, why declarative UI frmeworks use a shadow graph, and how Swift’s design is an evolution of C++’s philosophy.
UPDATE 2020-09: This no longer works for Intel Broadwell integrated GPUs as of Linux 5.4.
To learn how iTunes and Xcode sync with iPhones, I enabled a hidden option in macOS’s
usbmuxddaemon that logs how applications communicate with iOS devices over USB.
I read a novel where the rules for inheriting witchcraft resembles the real-world gene drive, so I developed a simulation and queried 86 million genealogy profiles to see how witchcraft would spread in real life.
I compared UEFI bootloaders from Google Pixel XL, 2XL, 3XL, and Lenovo Miix 630 to show how Qualcomm used the flexibility of UEFI to support Android and Windows.
… not because of the TrueDepth camera, but because its GPU and CPU aren’t powerful enough to track faces.
QEMU 3.0.0 can boot IBM’s AIX to a shell prompt. AIX is IBM’s version of Unix for their Power Systems line of PowerPC servers. I’ve been researching emulation, so I wrote a tutorial for running AIX on your computer.
Here’s how I reverse engineered Apple’s
metallibarchive format to extract the LLVM Bitcode for compiled Metal shaders. I proved that normal LLVM can read the Bitcode and compile it to x86-64 and ARM64 assembly.
I made a Swift Playground for iOS 12 that opens the Memoji editor on iPad. Along the way, I learned to swizzle Obj-C methods in Swift and to use a library with no documentation.
up 74007 days, 22:31”? Yeah, seems legit: I booted my computer 200 years ago on December 10th, 1815. Actually, I wrote a kernel extension to change the output of the
uptimecommand on macOS, to learn the basics of kernel module programming.
recoverydto start on an emulated iPhone running iOS 12 beta 4’s kernel using a modified QEMU. Here’s what I learned, and how you can try this yourself.
I tried to boot an iOS 12 kernelcache in QEMU: I managed to get as far as IOKit startup before receiving a kernel panic. I learned a lot about how iOS boots up with this project.
I helped track down the misbehaving macOS compatibility patch that broke native tabs support in VS Code. I also learned to avoid introducing new bugs in bugfixes.
I learned to extract working shared libraries from macOS’s dyld shared cache, and learned a bit about Mach-O executables, Objective-C, and problem solving along the way.
Here’s how to port your iOS apps to macOS 10.14 Beta using Apple’s iOSMac/Marzipan framework. A “Hello World” iOS app can become a macOS app in less than 5 minutes. (I timed it.).
Macs are case insensitive, but the iOS Simulator uses a hidden option in macOS’s kernel to enable case sensitivity, to match real iOS devices. This option can also be set with macOS’s
taskpolicytool, so you can launch any macOS process with case sensitivity enabled.
VSCode is my favorite editor, and I wanted to contribute back to this open source project that helped me so much. Thus, I learned to build and debug VSCode to triage and fix two bugs from their bug tracker.
What do Photoshop, Matlab, Panic Transmit, and Eclipse have in common? They are among the 299 apps for which macOS applies compatibillity fixes.
I learned to call Android’s hidden ActivityManager APIs from the ADB command line to access the screenshots of Recent Apps, so I can build a custom app switcher.
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