Monthly Archive:: August 2015

The Genode project announced the version 15.08 of their OS framework. The most prominent topics of the current release are the use of Genode as day-to-day operating system by their developers and the added ability to run Genode-based systems on top of the Muen separation kernel.

Where monolithic kernel architectures represent one extreme with respect to kernel complexity, separation kernels mark the opposite end. The code complexity of monolithic OS kernels such as Linux is usually counted in terms of millions of lines of code. In stark contrast, modern microkernels such as NOVA and seL4 are comprised of only ten thousand lines of code. Separation kernels go even a step further by reducing the code complexity to only a few thousand lines of code. How is that possible? The answer lies in the scope of functionality addressed by the different types of kernels. The high complexity of monolithic kernels stems from the fact that all major OS functionalities are considered as being in the scope of the kernel. In particular, device drivers and protocol stacks account for most of the code in such kernels. Microkernels disregard such functionalities from the scope of the kernel by moving them to user-level components. The kernel solely retains the functionality that is fundamentally needed to enable those components to work and collaborate. In order to accommodate a wide range of workloads, microkernels typically provide interfaces to user land that enable the dynamic management of low-level resources such as memory, devices, and processing time. Genode's designated role is to supplement microkernels with a scalable and secure user-level OS architecture. In contrast to microkernels, separation kernels disregard dynamic resource management from their scope. All physical resources are statically assigned to a fixed set of partitions at system-integration time and remain unchanged over the lifetime of the system. The flexibility of microkernels is traded for the benefit of further complexity reduction. Their low complexity of just a few thousand lines of code make separation kernels appealing for high-assurance computing. On the other hand, their static nature imposes limitations on their application areas.

Muen as a representative of separation kernels is special in two ways. First, whereas most separation kernels are proprietary software solutions, Muen is an open-source project. Second, the kernel is implemented in the safe SPARK programming language, which is able to formally verify the absence of implementation bugs such as buffer overflows, integer-range violations, and exceptions. Thanks to the close collaboration between the Muen developers and the Genode community, the assurance of the Muen separation kernel can now be combined with the rich component infrastructure provided by Genode. From Genode's perspective, Muen is another architecture for their custom base-hw kernel. In fact, with Genode on Muen, a microkernel-based system is running within the static boundaries of one Muen partition. This way, the component isolation enforced by the base-hw kernel and the static isolation boundaries enforced by Muen form two lines of defense for protecting security-critical system functions from untrusted code sandboxed within a Genode subsystem.

The second major theme of the current release is the use of Genode as the day-to-day operating system by its developers. Since the beginning of June, one of the core developers is exclusively working with a Genode/NOVA-based system. The key element is VirtualBox with its powerful guest-host integration features. It allows for an evolutionary transition from Linux-centric work flows to the use of native Genode applications. Network connectivity is provided by the Intel wireless stack ported from the Linux kernel. File-system access is based on NetBSD's rump kernels. For using command-line based GNU software directly on Genode, the Noux runtime environment comes in handy. The daily use of Genode as general-purpose OS motivated many recent developments, ranging from the management of kernel memory in NOVA, over new system monitoring facilities, SMP guest support in VirtualBox, to user-facing improvements of the GUI stack. These and many more topics are covered by the comprehensive release documentation.

This new release - one of the final 1.x released before 2.0 and the tablet hit, I suppose - integrates a whole bunch of options and settings related to the Android application support into the Sailfish settings applications, such as stopping/restarting Alien Dalvik, blocking Android applications from accessing your Sailfish contacts, allowing Android applications to keep running properly in the background, and so on.

There's more, so be sure to update.

Despite Google's claims to the contrary, though, older Wear devices seem to work just fine - reports are coming in for the Moto 360 and LG G Watch also working with the iPhone application just fine.

If you see another annoying settopbox, they blew it.

Confirmed: Google wants me to switch to iOS.

Disgusting.

Jordan Hubbard spoke recently at the Bay Area FreeBSD Users Group to discuss NextBSD, a "spork" of FreeBSD. He "covers why mach ports are extremely useful in some cases and no UNIX IPC primitive is an adequate substitute." There's a video of the BAFUG talk and copies of the original slide deck that goes into some detail about NextBSD.

There's a video too.

Another creepy story here. Windows 10's privacy is turning into a headache for Microsoft. It won't be long now until prime time and daytime news shows start picking this stuff up, and blow it out of proportion - deserved or no.

It gets even worse than this email. There are gay men and women in countries where being gay is punishable by death, who were using this site to meet other gay men and women, in secret. This hack will out them, possibly leading to their death.

This hack and spreading of private information is just as bad as any other, similar hacks. Despicable as it is, cheating is not a crime, and even if it were, do we really want to live in a world with mob justice? And yes, the parent company in this particular case isn't exactly of clear conscience, but that's no reason to throw its users under the bus - or have them murdered by barbaric, mediaeval governments.

I know a lot of people like the world to be black and white, because it's simple, easy to understand, and doesn't strain the brain. Sadly for them, that's not how the world works.

It's going to take a lot of convincing to get me to switch from Safari back to Chrome on my MacBook Pro.

I'll admit I had to do a bit of reading to educate myself on what bcache actually is. Fascinating to see that it has evolved into a full-blown file system.

Extensions play a central role in Firefox' appeal, so they have to be very careful with how they implement these changes.