users December 2016

users@lists.genode.org

23 participants
19 discussions

Restoring child with checkpointed state
by Denis Huber 15 Nov '17

15 Nov '17

Dear Genode community, thanks to you [1], I could implement my Checkpoint/Restore mechanism on Genode/Fiasco.OC. I also added the incremental checkpoint optimization, to stored only changed memory regions compared to the last checkpoint (although this is not working reliably due to a Fiasco.OC bug, which Stefan Kalkowski found for me [2]). I also managed to checkpoint the capability map and restore it with new badges and insert missing capabilities into the capability space of Fiasco.OC. [1] https://sourceforge.net/p/genode/mailman/message/35322604/ [2] https://sourceforge.net/p/genode/mailman/message/35377269/ My problem is, although I restore all RPC objects, especially the instruction and stack pointer of the main thread, and the capability map and space, the target component just starts its execution from the beginning of its Component::construct function. My approach: For the restore phase, I use Genode's native bootstrap mechanism (i.e. I create a Genode::Child object) until it requests a LOG session from my Checkpoint/Restore component. I force a LOG session request in ::Constructor_component::construct() just before "Genode::call_component_construct(env);" in https://github.com/genodelabs/genode/blob/16.08/repos/base/src/lib/base/ent… Until the session request several RAM dataspaces are created, among other RPC objects, and attached to the address space. In my restore mechanism I identify the RPC objects, which were created by the bootstrap/startup mechanism, and only restore their state. After that point, I recreate and restore the state of all other RPC objects which are known by the child component. At last, I restore the capability map and space. During that process the mandatory CPU threads are identified (three of them: "ep", "signal_handler", and "childs_rom_name") and restored to their checkpointed state, especially the ip and sp registers. I did that through the use of Cpu_thread::state(Thread_state), but without luck. Also, although I know that the CPU threads were already started, I tried to call Cpu_thread::start(ip, sp), but without success. After the restoration which happens entirely during the LOG session request of the child, my component returns with a valid session object to the child. Now the child should continue the work from the point where it was checkpointed, but it continues its execution right after the LOG session request, ignoring the setting of the instruction pointer. The source code of the restore CPU thread state is found in [3]. I used run script [4] for the tests. [3] https://github.com/702nADOS/genode-CheckpointRestore-SharedMemory/blob/660a… [4] https://github.com/702nADOS/genode-CheckpointRestore-SharedMemory/blob/660a… Curiously, the child runs just as nothing happened, although its stack area was also manipulated. Perhaps my approach by reusing the bootstrap/startup mechanism is not destined to work, or maybe I have missed some important points in this mechanism. If so, please point me to the problem. I would also consider other restoration approaches, for example, by recreating all RPC objects manually and insert them into the capability map/space. What are your thoughts on my approach? Can it work? Does something else work better? Kind regards, Denis

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Reading thread registers
by Denis Huber 07 Mar '17

07 Mar '17

Hello Genode community, in my checkpoint component I intercepted the Cpu session of a child, through which I get all Thread_capabilities created for and by the child. To store the state of a component I need to store the registers of the threads used by the child. I tried reading the registers through the "Thread_state Cpu_thread::state()" method, but it did not contain any information about (just zeros). I'm using Genode 16.05, kernel Fiasco.OC (pbax9 build). By inspecting the kernel API of foc, I found out that the function l4_thread_ex_regs_ret can read the sp and ip register. By changing the state method in platform_thread.cc (in base-foc) I could get the registers: Thread_state Platform_thread::state() { Thread_state s; if (_pager_obj) s = _pager_obj->state; _pager_obj->state.ip = ~0UL; _pager_obj->state.sp = ~0UL; l4_umword_t flags = 0; l4_thread_ex_regs_ret(_thread.local.dst(), &_pager_obj->state.ip, &_pager_obj->state.sp, &flags); s.sp = _pager_obj->state.sp; s.ip = _pager_obj->state.ip; s.kcap = _gate.remote; s.id = _gate.local.local_name(); s.utcb = _utcb; return s; } But other registers like r0 - r12 are missing. Is there a simple way in Genode to get them? Can I utilize the utcb memory location to find the missing registers? Kind regards Denis

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Genode on Odroid-XU4
by Yevgeny Lavrov 24 Jan '17

24 Jan '17

Greetings I would like to try Genode on Odroid-XU4. I aware that there's no support available for this ARM device yet. However, I want to give it a try, but I don't know where to start. Can you please point me in the right direction so I can find the information that I'll need to get started this task? Thanks

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Roadmap 2017
by Norman Feske 09 Jan '17

09 Jan '17

Hello everyone, the end of the year is approaching. So it is the right time to make up our minds for the upcoming year. Review of the past year ----------------------- When reviewing the roadmap for 2016, it is quite clear that our initial goals moved a bit out of focus throughout the year. Our overall theme was to make Genode more easily available outside the inner circle of developers. Topics like system configuration, package management, and tutorials spring to mind. However, the four releases of 2016 were mostly concerned with base technologies rather than end-user facing features. Just to name a few topic: * RISC-V architecture * Hosting Genode on top of the Muen separation kernel * Using Genode with the seL4 kernel * Fundamental revision of the framework API * Huge device-driver improvements (like wifi, graphics, USB, ACPI) * Features like VirtualBox 5, virtual networking, TOR, Rust, ... There were two reasons behind this shift. First, exploring new ways to combine Genode with other technologies (like RISC-V, seL4, Muen) is very exciting from a developer's perspective and creates new opportunities for collaboration. On that account, I am particularly happy about the relationships that we now enjoy with the Muen and seL4 developers. Second, we realized that the concerns of the existing Genode users should be prioritized over extending the user base. The existing users are primarily interested in API stability and maturity. So personally, I made it my priority to free Genode from legacies and known architectural limitations. Over the year, we introduced and cultivated the new framework API that is designed for safety, achieved cross-kernel binary compatibility, and revised the framework's most fundamental protocols. This was quite a feat! Now, knowing that the time of sweeping architectural changes lies behind us, I feel much more confident that users of Genode will enjoy it. Even though we largely deviated from our original plan, I am very satisfied with the outcome of the past year. After all, the roadmap is a plan. Plans can be changed. My goals for 2017 ----------------- There are still two low-level construction sites left that I want to wrap up, which is the introduction of application binary interfaces (ABI) and ability to dynamically configure the init component. The ABIs largely decouple library implementations from their users and thereby will greatly ease the creation of a scalable package-management system on top of Genode. The dynamic init will potentially cover the use cases of most of today's custom-implemented Genode runtime environments (like launchpad, cli_monitor) by one versatile solution that scales well. This, in turn, will facilitate the creation of more sophisticated and dynamic Genode systems. In contrast to the "Turmvilla" scenario that I am currently using, such systems could be defined and reshaped not only at their build time but during runtime. With the ABI and dynamic init in place, I'd like to concentrate on stressing the framework, both in terms of using it much more intensively and by creating artificial stress. By the time of the release of version 17.05, Genode should - in principle - be well suited for the the maintenance of a long-term supported version. When looking at my use of the Turmvilla scenario on my laptop, I see two principle limitations. First, the system is hard to set up. Installing it on a new machine is quite a burden. (i.e., I have shiny new x260 on my desk that gathers dust because I don't find the time to install Genode on it) This needs to be fixed! Second, the system does not stay up to date automatically. I would love to always use the components of the latest master branch so that I can detect and correct regressions that slip through our automated tests. Consequently, I need to craft a solution that allows me to update Genode on the fly and - if anything goes wrong = allows me to roll back to the previous version. There are many other ideas on the back of my head. But the topics outlined above are the most important ones for me. Now I am interested in your plans and goals for 2017! ;-) As every year, I will to consolidate the discussion into the official roadmap by mid of January. Cheers Norman -- Dr.-Ing. Norman Feske Genode Labs http://www.genode-labs.com · http://genode.org Genode Labs GmbH · Amtsgericht Dresden · HRB 28424 · Sitz Dresden Geschäftsführer: Dr.-Ing. Norman Feske, Christian Helmuth

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USB storage detachment / reattachment
by Martijn Verschoor 23 Dec '16

23 Dec '16

Dear Genode community, Currently I’m working on a scenario that includes loading a file from USB storage device (stick). I have a composition that works in principle but has ‘rough’ edges, particularly regarding detachment / reattachment of the USB storage device. I’d like to share my approach with you and appreciate your feedback / suggestions on what I could improve. A rough sketch of the scenario is: A user: - inserts a USB storage device with candidate files in an available USB port on the platform - x86 in this instance, - selects one or more files on the USB storage device to load - using a custom CLI, - removes the USB storage device. - (and sometime later) repeat the steps above. A short description of the composition (top-down): - the custom CLI component requests a file session with a rump_fs server when handling a user command. - the rump_fs server has a block session with a part_blk server. - the part_blk server has a block session with the usb driver (dde_linux/x86), using storage. I attached a run script snippet that shows these relations. The USB storage device is formatted with ext2fs. My (initial) findings: - When I insert the USB stick, the usb driver detects the mass storage device and consequently the rump_fs server mounts the ext2fs. The CLI component can access the filesystem and list/read/write files on the USB stick. All as expected. - When I remove the USB stick, the usb driver detects removal, but the rump_fs remains unaware. The CLI component can successfully open new file system sessions and even list the files in the root directory, even though the actual storage device is detached... - The rump_fs server aborts when a filesystem is not of the expected type. - To complicate matters more, the target platform is booted from a - different - USB stick. Currently the usb driver detects this USB stick as mass storage device and the rump_fs aborts because the fs is not the expected ext2fs. For the latter finding, I am aware that the usb driver supports a policy mechanism for raw devices (in combination with the usb_report_filter component). But to my knowledge for storage devices, such a policy mechanism does not exist, right? Regarding detachment / reattachment of USB storage, I understand that at startup of this composition, the rump_fs server immediately requests a block session at the part_blk server, which in turn requests a block session at the usb driver. This whole blocks until a USB storage device is plugged in. When this happens, the chain of sessions requests is setup and the file system client can access the medium. Now if the USB storage device is detached, what happens to the open sessions? As a way to support detachment / reattachment of USB storage I’m thinking about placing the rump_fs and part_blk components in a child subtree of the CLI component that is spawned on demand and cleaned-up after use. But this seems a bit like overkill. Am I overlooking the simple solution? Met vriendelijke groet / kind regards, Martijn Verschoor Cyber Security Labs B.V. | Gooimeer 6-31 | 1411 DD Naarden | The Netherlands +31 35 631 3253 (office) | +31 616 014 087 (mobile)

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FWD: List of accepted talks for Microkernel/Component OS devroom @ FOSDEM 2017
by Josef Söntgen 22 Dec '16

22 Dec '16

Hi everybody, the schedule for the FOSDEM 2017 microkernel devroom is finished and the Genode community participates in devroom as it did in the past. There are some Genode related talks and a handful of Genode developers will attend the conference. So if you want to meet up, the FOSDEM is the ideal place. Regards Josef ----- Forwarded message from microkernel-devroom@...86... ----- Hello everybody, I am glad to annouce that we mananged to accept all submitted talks: A kernel in a library — Genode's custom kernel approach Martin Stein Deterministic replay support for Genode components: Performance penalty and challenges Mahoukpego Parfait Tokponnon Introducing kernel-agnostic Genode executables Norman Feske HelenOS in the year of the fire monkey Jakub Jermář Redox OS — A safety-first microkernel developed in Rust David Teller Secure Microkernel for Deeply Embedded Devices Jim Huang TCP/IP for MINIX, the good, the bad, the ugly Philip Homburg The VFS paradigm from the perspective of a component OS Christian Helmuth Virtualization on the Hurd Justus Winter The schedule can be found the FOSDEM website [1]. [1] https://fosdem.org/2017/schedule/track/microkernels_and_component_based_os/ On a side note I would like to ask every speaker to join this mailing list to have one common communication channel for discussing any further matters regarding the devroom's organization. Best regards & see you at FOSDEM! ----- End forwarded message ----- -- Josef Söntgen Genode Labs http://www.genode-labs.com/ · http://genode.org/

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Re: Updating Genode's license to AGPLv3 + open-source linking clause
by Nobody III 19 Dec '16

19 Dec '16

I'm thinking of the possibility of Genode becoming a consumer OS platform. One benefit of Genode is that a user doesn't need to trust every single program running on his computer. If I have to run a piece of proprietary software, Genode would be my preferred platform. Also, for software that I don't have to trust, I don't care as much whether it's proprietary. I would prefer that Adobe and Autodesk port their software to Genode, especially since 3D software doesn't work well in VirtualBox. I prefer free software because it's more trustworthy, but I still use some proprietary software (e.g. Google Chrome with Flash Player). On Dec 17, 2016 8:38 AM, "Norman Feske" <norman.feske@...1...> wrote: Hello Ben, > Am I correct that software that doesn't link directly to any AGPLv3 code > (e.g. code that just uses libc) is okay to have proprietary licenses? this is not correct because the proprietary code would still linked to Genode in addition to the libc. > That seems to be the logical interpretation, and probably the most > beneficial, as it wouldn't discourage companies from porting their > software to Genode. This statement is interesting because it raises the question of the motives and goals behind Genode. What does "most beneficial" mean? Beneficial to whom? Let me try to look at this question from different perspectives. 1. The Free Software user For an end user who consciously uses a Free Software ecosystem, proprietary applications are not interesting because they restrict the freedom of the user. Frankly speaking, I am an example of such a user. I have not touched proprietary applications on my computer since several years. But I vividly remember the inconvenience of using opaque installers, the lack of security updates, the inability to fix bugs, or the suspicion about backdoors and vulnerabilities introduced by such applications. The argument that an operating system would be useless without proprietary applications was probably valid 15 years ago. Today, the Free Software world is so strong and diverse that this argument does not hold anymore. 2. The consumer Many end users are neither aware nor interested in technical details. They just want to get work done, browse the web, play games, or watch movies. From the operating-system's perspective, I also see professionals (like photographers, writers, business users) in this category. A typical consumer uses the OS that comes pre-installed on the device, and accepts the inherent dependency from commercial vendors. The user does not care too much about the uppercase Freedom of software. I am sometimes such a user. E.g., when using my portable audio player, I just want to listen to music. 3. The proprietary application vendor For a proprietary application vendor, the consumer (2) is a business case. The application vendor wants to create and distribute applications with as little costs as possible and sell them to the consumer at the highest price possible. The latter would not be easily possible if the application vendor published its own "intellectual property" to everyone for free. Hence, the applications tend to stay proprietary to uphold the business case. The application vendor has to consider expenses like paid-for development tools, licenses of commercial libraries, or app-store fees as cost factors. It is clear that proprietary application vendors welcome liberally licensed open-source libraries or platforms for hosting and distributing proprietary software at no costs. 4. The proprietary platform vendor A vendor may use Genode as the basis of a proprietary platform, for example an appliance designated for a specific market. But such a platform may in principle also be targeted at the consumer mass market. In order to use Genode as the basis of a proprietary platform, the platform vendor obtains a commercial license of Genode. In this case, the choice of Genode's regular open-source license is not a concern for such a platform vendor. 5. The Free Software developer The motives of Free-Software developers are diverse. But regardless of the motives, they generally improve the lives of Free-Software users. If the software addresses consumer needs, Free-Software developers often find themselves as competing with proprietary applications. Of course, the categories are not clear-cut. But they help to address two questions: (1) Who would benefit from the ability to host proprietary applications on top of the open-source Genode system, and (2) whom do we want to cater with the open-source license of Genode? Regarding question (1), only the proprietary application vendor would immediately benefit, but only under the condition that Genode is a platform used by their target audience (consumers). This is of course not the case. Hence, for an application vendor, there is no business case for porting their applications to Genode at all. Instead, application vendors focus on popular end-user platforms like iOS, Android, Windows. Regarding question (2), with Genode's open-source license, we want to cater Free-Software users and Free-Software developers in the first place. Acknowledging that the open-source Genode system is not a consumer platform as is, there is no benefit in catering the interests of proprietary application vendors with Genode's open-source license. Please don't get me wrong. I don't dismiss consumers. I see two principle ways of how Genode can reach popularity among consumers, by becoming a consumer platform, or by consumers gravitating towards Free Software. Regarding the former, I am convinced that Genode can become a popular consumer platform only with strong commercial incentives of a platform vendor. Should a platform vendor develop such an interest, it would seek a commercial license. The funding obtained from the commercial licensing would ultimately help Genode and thereby the Free-Software community. The second direction is that consumers would buy products that are solely based on Free Software. Personally, as a Free-Software user, I find this prospect quite exciting. Given this line of thinking, I hope that you agree that the ability to host proprietary applications on top of the open-source Genode system would not bring any tangible value. But maybe I have overlooked something? Please don't hesitate to share your thoughts. Regards Norman -- Dr.-Ing. Norman Feske Genode Labs http://www.genode-labs.com · http://genode.org Genode Labs GmbH · Amtsgericht Dresden · HRB 28424 · Sitz Dresden Geschäftsführer: Dr.-Ing. Norman Feske, Christian Helmuth ------------------------------------------------------------ ------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ genode-main mailing list genode-main(a)lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/genode-main

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Updating Genode's license to AGPLv3 + open-source linking clause
by Norman Feske 18 Dec '16

18 Dec '16

Dear community, with the upcoming release 17.02, we are planning to change Genode's open-source license. The current GPLv2 license ------------------------- The Genode OS Framework is currently licensed under the terms of the version 2 of the GNU General Public License. We originally picked this license in 2008 for the following reasons: * It captures the spirit of Free Software, which we deeply share with the FSF. The license ultimately empowers the authors and the end users of software. Genode would not exist without Free Software. It is built on the shoulders of software like GCC, the GNU system, or Linux. All software that we at Genode Labs develop is Free Software. * At the time of the first Genode release, the GPLv2 was a time-tested and widely used license. * It enables the dual-licensing business model of Genode Labs. If Genode is commercially leveraged for proprietary solutions, Genode Labs benefits from the success of such products. This way, Genode has a long-term strategy to fund its development without relying on donations, public funding, or venture capital. We value this independence as fundamental for the sustainability of our project. * Adopting the same license as Linux made a lot of sense because we are routinely reusing Linux driver code inside Genode components. Affero General Public License ----------------------------- The time did not stand still. The GPLv3 became widely spread and well-understood. It rectifies several shortcomings of the GPLv2. Furthermore, the Affero General Public License [1] closes loopholes of the GPL license with respect to web applications. Unlike 2008 when most applications were programs executed directly on the end user's computer, web applications have become predominant by now. For Genode, we ignored the deficiencies of the GPLv2 for a long time. At the same time, with more and more software being added to our "ports" - the library of 3rd-party software ported to Genode - the license compatibility question, which we tried to avoid for Linux kernel code, arises for other 3rd-party software that is combined with Genode. Admittedly, one reason for our hesitance was our fear of long-winded and opinion-loaded discussions around the licensing topic. But we ultimately have to acknowledge that an update to a modern license and a clarification of our stance with respect to the interoperability of Genode with other Open-Source software is long overdue. The AGPLv3 encapsulates exactly the spirit, which originally attracted us to the GPL. After careful review, it makes perfect sense to use it for Genode. The following Wikipedia article nicely explains the rationale behind this license: https://en.wikipedia.org/wiki/Affero_General_Public_License Addressing interoperability concerns ------------------------------------ Unlike most end-user software, which falls into a tangible category (application, library, kernel), Genode plays a special role. Not just because it is an operating system. But it is very unconventional at that: It is a collection of programs (Genode components). It is also a set of application libraries. It is also a "system library". It also comprises a dynamic linker. It may also be the kernel (i.e., our base-hw kernel). The lines between the categories become blurry. For this reason, we intend to add a linking clause to Genode's version of the AGPL license text, similar to the classpath linking exception but restricted to software licenses that are blessed by the Open-Source Initiative, the Free Software Foundation, or Genode Labs. Inspired from the text of the classpath linking exception, our clause would look as follows: Linking Genode code statically or dynamically with other modules is making a combined work based on Genode. Thus, the terms and conditions of the GNU Affero General Public License version 3 (AGPLv3) cover the whole combination. As an "additional permission" as defined by Section 7 of the AGPLv3, Genode Labs as the copyright holder of Genode gives you permission to link Genode source code with "independent modules" to produce an executable if the independent modules are licensed under an "approved license", and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An "approved license" is a license that is officially approved as an Open-Source license by the Open Source Initiative [1], or listed as a Free-Software license by the Free Software Foundation [2], or explicitly approved by Genode Labs. An "independent module" is a module which is not derived from or based on Genode. If you modify Genode, you may extend this exception to your version of Genode, but you are not obliged to do so. If you do not wish to do so, delete this exception statement from your version. [1] https://opensource.org/licenses [2] https://www.gnu.org/licenses/license-list.en.html With this clause in place, we want to express our consent to use Genode in combination with other open-source software. Note, however, that - unlike the classpath exception clause, our clause excludes the combination of Genode with proprietary software. This is our deliberate decision. With Genode becoming AGPLv3, we face the question of how to integrate 3rd-party code (like GPLv2-licensed Linux device drivers) in a Genode component. To address this concern, Genode-specific glue code that is needed to integrate the 3rd-party code with the Genode API ("system library") will have a license that is compatible with both the license of the 3rd-party code and Genode's AGPLv3 as such glue code is a derivative of both Genode and the incorporated code, e.g., the MIT license. In line with the wording of the exception clause above, when distributing binaries of such components, the licenses of both Genode and the incorporated 3rd-party code must be respected. I hope that you support our plan to relicense Genode to AGPLv3 along with our linking exception clause. Should you have doubts about us taking this direction, please let me know. Best regards Norman -- Dr.-Ing. Norman Feske Genode Labs http://www.genode-labs.com · http://genode.org Genode Labs GmbH · Amtsgericht Dresden · HRB 28424 · Sitz Dresden Geschäftsführer: Dr.-Ing. Norman Feske, Christian Helmuth

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Listing a directory using the file system session
by Martijn Verschoor 16 Dec '16

16 Dec '16

Dear Genode community, I’m looking for a way to list the files (nodes) in a directory using a file system session. Amongst other, I studied the File_system::Session and file_system/utils.h but cannot find a hook to get started. I see that reading the directory nodes is supported -> this returns the Directory_entry struct with information about the directory itself, but not about the nodes the directory contains (right?). Is there a way retrieve the latter? Any help is appreciated! Met vriendelijke groet / kind regards, Martijn Verschoor Cyber Security Labs B.V. | Gooimeer 6-31 | 1411 DD Naarden | The Netherlands +31 35 631 3253 (office) | +31 616 014 087 (mobile)

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Yet another question
by Florian Grätz 15 Dec '16

15 Dec '16

Hello, community, first of all: let me express, how helpful and responsive this mailing list is. I finally succeeded in running make for hw_rpi - still I have no idea how to run it on my real hardware. make surely created many files, most of them object files (.o), or object archives (.a). For running on my hardware, I would need an image file, which I can write on an SD card, though. How would I create one? Browsing through the .txt files didn't yield to anything useful. I also have another concern when making for target linux_x86 according to section 'Quick start to build genode for linux'. make run/demo quits with the following errors: /usr/bin/ld: fb_sdl.o: relocation R_X86_64_32 agains symbol '_ZTIN6Genode11Msgbuf_base13_Too_many_capsE' can not be used when making a shared object; recompile with -fPIC /usr/bin/ld: input.o: relocation R_X86_64_32S agains '.rodata' can not be used when making a shared object recompile with -fPIC /usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/6../../../x86_64-linux-gnu/crt1.o: relocation R_X86_64_32S against symbol '__libc_csu_fini' can not be used when making shared object; recompile with -fPIC /usr/bin/ld: final link failed: Bad value collect2: error: ld returned 1 exit status /home/florian/genode/repos/base/mk/prg.mk:222: recipe for target 'fb_sdl' failed If I run make without any arguments, the adio_drv doesn't build. The linker quits with the following messages: /usr/bin/ld: alsa.o: relocation R_X86_64_32 agains '.bss' can not be used when making a shared object; recompile with -fPIC /usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/6../../../x86_64-linux-gnu/crt1.o: relocation R_X86_64_32S against symbol '__libc_csu_fini' can not be used when making shared object; recompile with -fPIC /usr/bin/ld: final link failed: Nonrepresentable section on output collect2: error: ld returned 1 exit status /home/florian/genode/repos/base/mk/prg.mk:222: recipe for target 'audio_drv' failed Any hints would be greatly appreciated. All the best, Florian.

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