Classification: Filesystem Security & Runtime Sandboxing Status: Implemented & Verified
Executive Summary
This report analyzes permission boundaries, filesystem isolation, and execution failures encountered when integrating sandboxed application formats (Flatpak and AppImage) with external storage vaults (such as /mnt/lacie). It details the diagnostic triage of permission denials, FUSE execution restrictions, and the decision to standardize core system tooling on native package management.
Threat Model & Problem Statement
Application isolation frameworks (Flatpak, AppImage) provide sandboxing by restricting default access to the host filesystem. However, when operational workflows require direct access to designated storage mounts, isolated runtimes introduce specific operational failure modes: