GoKawiilKafel Introduces Modular Seccomp Policy Framework for App Sandboxing
A 2025 write-up on software sandboxing basics presents Kafel, a syscall-filtering policy system modeled on Docker's default seccomp profile but refined for unprivileged desktop use. It organizes allowed syscalls into named policy groups—covering areas like async I/O, basic I/O, clocks, and x86 compatibility quirks—drawing inspiration from systemd's seccomp filter sets and OpenBSD's pledge system.
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Sandboxing frameworks like this reduce attack surface by letting developers restrict which system calls a program can make, limiting damage from exploits. Structuring policies by category rather than a single monolithic list makes it easier for developers to compose minimal, auditable permission sets, improving both security and maintainability compared to ad hoc allowlists.
- Kafel's policies are based on Docker's default seccomp profile but tuned for non-root, unprivileged applications.
- Categories exclude root-only and rarely used fingerprinting-prone syscalls to reduce overhead and attack surface.
- Policy design borrows organizational ideas from systemd's filter sets and OpenBSD's pledge promises.
Source: blog.emilua.org, 2026-09-20
Published there as: “Software Sandboxing: The Basics (2025)”
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