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@thestinger thestinger released this 23 Feb 22:21
· 248 commits to main since this release
11

Full list of changes from the previous release (version 10). Notable changes:

  • improve layout
  • improve theme
  • improve dark theme support
  • improve app icons and use vector icons instead of bitmaps
  • center canvas
  • add edge-to-edge support
  • rename to app.grapheneos.pdfviewer with original-package set to the previous app id to preserve state in GrapheneOS (the rename will be shipped in the next release of GrapheneOS)

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.