The seL4 Microkernel. Security is no excuse for poor performance! The world’s first operating-system kernel with an end-to-end proof of implementation. L4Ka::Pistachio is the latest L4 microkernel developed by the System Architecture Group at the University of Karlsruhe in collaboration with the DiSy group at the. L4 got rid of “long message passing”, in favor of shared memory and interrupt-like IPC. This is great for the kernel – no copying delays and no.

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L4 Based Operating Systems L4 provides an minimal set of mechanisms to applications running on top of it. Exactly, and then one has to deal with the runtime and GC.

What does separation between kernel and application really matter for single-function devices, like most IoT things are? Depends on what level of detail you’re interested in. The researchers state that the cost of formal software verification is lower than the cost of engineering traditional “high-assurance” software despite providing much more reliable results.

L4Ka Project

The kernel was based on initial work done at Dresden. Workshop on Isolation and Integration for Dependable Systems. Sec Microkernel Reference Manual has been made available. This is classical defense in depth strategy, but enforced through both runtime and formal methods.

The L4 microkernel family

Archived from the original on September 29, The “C” that was compiled was an embedding of it in HOL called Simpl which the aforementioned process verifies and converts to verified code. Furthermore, Fiasco contains mechanisms for controlling communication rights as well as kernel-level resource consumption. Modifications are aimed at reducing kernel complexity and memory footprint. The systems not having basic security measure that budget startups pull off indicates it’s not that such a baseline was too difficult: After some experience using L3, Liedtke came to the conclusion that several other Mach concepts were also misplaced.


But I would be very wary of an IoT device claiming to have inherited security from it. The L4Ka team has switched to GitHub microkernwl all repositories. Archived from the original on January 11, OKL4 shipments exceeded 1. That is completely untrue. His original implementation in hand-coded Intel i -specific assembly language code in sparked intense interest in the computer industry.

I haven’t timed mocrokernel recent ones but there’s numbers of Mach vs L4 in here: Pistachio kernel and focuses on platform independence. Novemer Wiki available A wiki is now available at wiki.

Not really, to verify C code you need to set the compiler and its corresponding version in stone for the verification process, as UB can change even between versions of the same compiler. An operating system based on a microkernel like L4 provides services as servers in user space that monolithic kernels like Linux or older generation microkernek include internally. Using capabilities and making microekrnel memory management a user-level responsibility, memory management is fully delegatable with low overheads, and automatically extends to kernel memory.

If the shared memory page is something like a chain of linked buffers, one side may be able to screw up the other side. I’m but a simple application developer but I do care about security and if there were a platform I could develop against that gave me confidence my code was far less likely to be undermined by kernel or TCP stack vulnerabilities I think I’d be encouraged to do a better job of security myself. I think you would also have to verify resulting binary, compiler, libraries That’s my non-specialist understanding of what the papers said.

PERSEUS is an open-source project that shows that this can be achieved with much less programming effort and more flexibility than typically thought. Is it a full verification yet? NOVA consists of a microhypervisor, a user level virtual-machine monitorand an unprivileged componentised multi-server user environment running on top of it called NUL.


QNX is similar to early L4, but they’ve taken slightly different paths. In L4 and related mlcrokernel, that usually means that the kernel doesn’t even include the memory manager the “pager”.

Currently Maintained Kernel Implementations

It is currently running on x86 and ARM and it is binary compatible with the native Linux kernels. However, the complexities of a fully preemptible design prompted later microkernle of Fiasco to return to the traditional L4 approach of running the kernel with interrupts disabled, except for a limited number of preemption points. But that’s not what the discussion here is really about. It has formal proofs that the kernel mechanisms can be used to enforce integrity and confidentiality of user-level components.

Retrieved 26 April Retrieved from ” https: But it microkefnel give you a proven isolation boundary. But the o4 point is that usually in embedded systems, there is no micromernel between “application” and “kernel”, at least on the low-end of CPU power scale.

L4 was created partly due to how much Mach failed in performance and such. If the goal is to provide a verifiably correct kernel, why not build that kernel in something like OCAML so you can leverage a better type micrkkernel and use the existing verification infrastructure in that language? Best of both worlds? It also runs on Fiasco-UX. I’ve done some L4 work so you don’t need to spend a lot of time explaining. I don’t have personal knowledge of these environments, so I wouldn’t know if I were wrong about this.

Animats on Sept 21, Where can I get the source for these to look at them? Amateurs did a filesystem with a fraction of the work that pro’s did the kernel: Welcome to the L4 webpages!