John Wu @topjohnwu
Creator of Magisk. Hacking Android since 2016. Android Platform Security @Google. ex-Apple. Tweets are my own. github.com/topjohnwu Taiwan / US Joined March 2012-
Tweets4K
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Followers63K
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Following72
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GitHub actions is on fire 🔥 lately! Not only did they add KVM support on the Linux runners, they just added Apple Silicon runners too! The M1 runners are now the fastest code builders available for free 😂
Just published a new canary build supporting the latest U QPR2 beta 😉
Reverse engineering and sending iMessages on non Apple devices is fun. I mean, I started my Magisk journey with bypassing root detection, so of course I love these stuff. What rubs me the wrong way with the whole Beeper thing is that they are trying to make a business out of it.
Waiting for the day Apple to utilize something like HW attestation to iMessage so all the reverse engineered hacks will be permanently dead.
I recently added a lot of tests to Magisk as part of continuous integration. Automated tests now cover MagiskInit, MagiskSU, Zygisk, basic application functionality, and the entire root request flow. Pretty neat and helped me squashed a few bugs during development 😉
Magisk v26.4 is released to the stable channel 🎉 This marks the end of v26 releases, and will start to focus on new and more exciting stuffs for v27!
Unsafe Rust is hard. This took me way longer to investigate and fix than I'm willing to admit. github.com/topjohnwu/Magi…
Titanium and USB-C is really nice. Lightning, I will not miss you.
The open source Intellij Rust plugin is deprecated along with the release of RustRover 🫤 It is working so well with Android Studio, making AS an all-in-one IDE for Magisk development. I'm really disappointed. Maybe it's time to invest into rust-analyzer + VSCode.
The open source Intellij Rust plugin is deprecated along with the release of RustRover 🫤 It is working so well with Android Studio, making AS an all-in-one IDE for Magisk development. I'm really disappointed. Maybe it's time to invest into rust-analyzer + VSCode.
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@topjohnwu Been there, done that LTOing a modified-for-baremetal Musl to also statically link with libc++/libc++abi/libunwind/compiler-rt to get modern C++ to run APFSFuse as a library in m1n1. 🙃 Size was good since LTO throws out all the dead code.
@citycds @techeter @topjohnwu @MishaalRahman And, yes, John works for Google, on Android security. Magisk is one of his hobby projects.
@topjohnwu Reverse engineering protected APIs is fun. Me and my friends made a whole GitHub repo of (mostly) reverse engineered reimplementations of popular web apps. It makes me sad that Beepeer is trying to push Beepeer Mini as a SUBSCRIPTION service. Corporations strike again.
@topjohnwu Looks like you're also missing a `#[repr(transparent)]` on the `pub struct FsPath`, otherwise the transmute is still unsound (although far less likely to cause a production issue).
Our talk was just accepted by the Black Hat Europe :) @ExploitDr0id @amdz23
FYI: A new beta version of Magisk is now available, most notably bringing the ability to extract boot images directly from payload.bin files. I've been using the otadump tool to extract partitions, so this will save me a step!
Magisk v26.2 released to public beta 🎉
Magisk is not just used by modders. It's also used by security researchers and, as I recently learned, even by SoC vendors like Rockchip LOL. Here's an official doc from Rockchip that shows how to install Magisk onto Rockchip devices on Android 9/10. gitlab.com/rockchip_andro…
btw...I've moved to Google TAG!!🎉⚡️💃🏽 We're building a team focused on ITW 0days & commercial surveillance vendors, combining the ITW work from Project Zero and TAG into this one new team. I couldn't be more excited to work with @_clem1 @benoitsevens & @vladhiewsha on this!
🎯@vladhiewsha @_clem1, Bahare, and I from Google TAG, discovered two new in-the-wild 0-days that were patched today: CVE-2023-36874 and CVE-2023-36884. Big thanks to Microsoft for the quick turn around on patches! 👏🏽 #itw0days msrc.microsoft.com/update-guide/v… msrc.microsoft.com/update-guide/v…
Back to your regularly scheduled Android news... You can now root your Pixel Watch following a guide by @breaddisease, provided you get a special debug adapter that Google distributes "by invitation only." Installing Magisk on the Watch follows the same process as on phones.
Personal news — I’ve moved to SF Bay Area 🌁 Leaving Hong Kong to embark on a new journey in tech. Let the Silicon Valley adventure begin!
RIP Unsafe DCL, one of the biggest problems rooted in Android. Excited to see the Safer dynamic code loading landed in Android 14, also proud as one of the designers of it. Seriously considering a blog post about the why and how, @topjohnwu 😉😉 developer.android.com/about/versions…
Hi folks, sadly I was impacted by the recent round of layoffs😢 While I'm no longer a FTE, I'm still working for Esper as a contractor. But because of that, I'm looking for more work! I'm open to any opportunities; my contact details can be found below. x.com/mishaalrahman/…
If you want to contact me for whatever reason, be it: - Ask a question - Send a tip - Tell me about what you're working on - Do an interview My DMs are open here, but I can also be reached in other ways. Open to chatting about anything Android related😁
@topjohnwu This might actually be an old vulnerability that's being taken advantage of thanks to the fact that you can downgrade apps via ADB. I just posted on the XDA thread to confirm with the OP, but will also look at the APK they ask you to downgrade to. x.com/_bagipro/statu…
@MishaalRahman I woke up, read your tweet and had a heart attack: did we miss a vulnerability? But no, this vulnerability is not present in the latest version, but in the old version we find it😌
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