Skip to content


Choose a tag to compare
@thestinger thestinger released this 10 Nov 23:28

Full list of changes from the previous release (version 5). Notable changes:

  • avoid notices being covered by the navigation bar after rotating the screen
  • update pdf.js to 2.5.207

This release will be bundled with the next release of GrapheneOS and is also being pushed out via the Play Store.

Simple Android PDF viewer based on pdf.js and content providers. The app doesn't require any permissions. The PDF stream is fed into the sandboxed WebView without giving it access to content or files. Content-Security-Policy is used to enforce that the JavaScript and styling properties within the WebView are entirely static content from the apk assets. It reuses the hardened Chromium rendering stack while only exposing a tiny subset of the attack surface compared to actual web content. The PDF rendering code itself is memory safe with dynamic code evaluation disabled, and even if an attacker did gain code execution by exploiting the underlying web rendering engine, they're within the Chromium renderer sandbox with no access to the network (unlike a browser), files, or other content.