libgojni.so MTE crash (memory unsafe code)

[bedair81]

Description

When enabling MTE on a react native app, specifically https://github.com/ZeusLN/zeus, the app crashes. I first assumed this was an app bug but after attempting to debug for a few hours it seems to be libgojni.so is a shared object not related to the app code itself. Unsure whether its a react native issue but if not I hope someone can point me to the right place. I would like to get this issue solved soon :)

Steps to reproduce

1. Use platform with MTE support(I am using a Google Pixel 8 Pro)
2. Install application with npx react-native@latest start
3. Build android app
4. Tap on quick start option in app
5. Observe Crash

React Native Version

0.73.7

Affected Platforms

Runtime - Android

Output of npx react-native info

System:
  OS: macOS 14.4.1
  CPU: (8) arm64 Apple M1 Pro
  Memory: 70.84 MB / 16.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 22.0.0
    path: /opt/homebrew/bin/node
  Yarn:
    version: 1.22.22
    path: /opt/homebrew/bin/yarn
  npm:
    version: 10.5.1
    path: /opt/homebrew/bin/npm
  Watchman:
    version: 2024.04.22.00
    path: /opt/homebrew/bin/watchman
Managers:
  CocoaPods:
    version: 1.15.2
    path: /opt/homebrew/bin/pod
SDKs:
  iOS SDK: Not Found
  Android SDK: Not Found
IDEs:
  Android Studio: 2023.2 AI-232.10300.40.2321.11668458
  Xcode:
    version: /undefined
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.11
    path: /usr/bin/javac
  Ruby:
    version: 2.6.10
    path: /usr/bin/ruby
npmPackages:
  "@react-native-community/cli": Not Found
  react:
    installed: 18.2.0
    wanted: 18.2.0
  react-native:
    installed: 0.73.7
    wanted: 0.73.7
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: Not found
  newArchEnabled: Not found
iOS:
  hermesEnabled: Not found
  newArchEnabled: false

### Stacktrace or Logs

```text
type: crash
osVersion: google/husky/husky:14/AP1A.240405.002.B1/2024042200:user/release-keys
uid: 10235 (u:r:untrusted_app:s0:c235,c256,c512,c768)
cmdline: app.zeusln.zeus
processUptime: 3s

signal: 11 (SIGSEGV), code 9 (SEGV_MTESERR), faultAddr 800c58e25fff080
threadName: Thread-1
MTE: enabled

backtrace:
    /data/app/~~LGMKC1QjK5elV8lDRGjkdw==/app.zeusln.zeus-UaxxLuxXkSyrgZGa9Wh-Jg==/lib/arm64/libgojni.so (pc 45e808)

### Reproducer

https://github.com/ZeusLN/zeus

### Screenshots and Videos

_No response_

[github-actions]

⚠️	Missing Reproducible Example
ℹ️	We could not detect a reproducible example in your issue report. Please provide either: If your bug is UI related: a Snack If your bug is build/update related: use our Reproducer Template. A reproducer needs to be in a GitHub repository under your username.

[bedair81]

not really sure how i can use the shared library in a template, the issue itself is reproducible 100% of the time following my steps above

[cortinico]

When enabling MTE on a react native app

What is MTE?

[bedair81]

When enabling MTE on a react native app

What is MTE?

Memory Tagging Extensions, its a new hardware feature that allows the debugging of memory unsafe code. Please see:
https://source.android.com/docs/security/test/memory-safety/arm-mte
https://newsroom.arm.com/blog/memory-safety-arm-memory-tagging-extension
for an in depth explanation :)

[cortinico]

libgojni.so

FYI, React Native doesn't produce this dynamic library.

@bedair81 could you provide a repro

1. using this template https://github.com/new?template_name=reproducer-react-native&template_owner=react-native-community
2. enabling the MTE as suggested by the Android documentation
3. reproduce the crash

[bedair81]

After doing some more investigation/testing, I think I've narrowed down the issue to some native "Go" code running in the app. I don't believe its a react native issue, sorry for wasting your time and thanks for helping me out!