After [1]KDBUS failed to make it into the mainline Linux kernel more than one decade ago as an in-kernel version of D-Bus, [2]BUS1 was proposed as [3]a clean sheet design for in-kernel, capability-based inter-process communication (IPC). BUS1 didn't gain enough traction to make it to the mainline kernel and then many of the same developers devised Dbus-Broker as a more performant D-Bus user-space implementation. Well, as a big surprise now, a new version of BUS1 is being worked on for the Linux kernel.

David Rheinsberg who was one of the original developers working on BUS1 has announced a new version of this IPC system for Linux. The same core ideas from a decade ago are in place while now it also has gone from being C code to Rust.

This new BUS1 version was stripped down to the basics and implemented in the Rust programming language. This initial announcement today went out on the Rust-For-Linux mailing list to gain feedback on the Rust aspect of this BUS1 implementation.

The new BUS1 in Rust comes in at 16 patches and just under nine thousand lines of new code, but more work is still to be completed in tackling all of its planned features and functionality.

Those interested in this new BUS1 rewrite in Rust can find the code on the [4]Rust-For-Linux mailing list .



[1] https://www.phoronix.com/search/KDBUS

[2] https://www.phoronix.com/search/BUS1

[3] https://www.phoronix.com/news/BUS1-In-Development

[4] https://lore.kernel.org/rust-for-linux/20260331190308.141622-1-david@readahead.eu/