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Genode::Pd_connection::address_space returns invalid capability
by Johannes Kliemann 21 Mar '18

21 Mar '18

Hi all, on base-linux when Genode::Pd_connection::address_space is called it returns an invalid capability. In the platform_drv [1] this causes the Region_map to fail to attach the DMA memory. On NOVA for example this capability is valid. I went through the code but I still have no idea what causes this capability to be invalid. Regards, Johannes [1]: https://github.com/genodelabs/genode/blob/1f7b5e75bfeb9ec35b975b4db66fc9b9b…

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problem building depot for fb_sdl
by Duss Pirmin 20 Mar '18

20 Mar '18

Hello all I have two clones of Genode (18.02-20-g1f7b5e75b) on two different machines. On my Ubuntu Artful fb_sdl can't be built due to a missing header file (SDL/SDL.h). I then tested it on my ARCH Linux, where the build works flawless. Does the recipe for fb_sdl by accident use some header files from the build system? Can this cause any problems or should I just install the missing header files on my Ubunt? Best regards, Pirmin

2 1

Individual file access
by Nobody III 16 Mar '18

16 Mar '18

To start off, I'm planning on building a component that handles file open/save requests for other components, primarily graphical applications. My plan is to use a qt5 QFileDialog for the user to select one or more files, then modify the vfs server's configuration to attach the selected file(s) to the component's filesystem. To attach individual files to a component's filesystem, it seems like I should write a server-side link vfs plugin. The plugin would be like a symlink, but would transparently resolve the link within the vfs server, providing access to otherwise inaccessible files. Is this possible? If so, can you give me some tips on how to implement it?

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Library Isolation
by Nobody III 16 Mar '18

16 Mar '18

In Genode, it would be very useful to be able to isolate libraries into their own child processes, greatly reducing the scope of possible security holes. I want to write a generic method for doing this simply, efficiently, and transparently. Can you assess my ideas and/or give me other ideas? For method calls, one option would be to generate an RPC interface for each library. This seems doable, but methods involving pointers to large amounts of data may be an issue. I could wrap pointers in buffers, but dynamic argument sizes and limits on RPC argument sizes could be an issue. I could maybe use a packet stream. This would fix some issues, and would remove the need for an individual RPC interface for each library, however the packet stream might need to be fairly large. I might be able to use the RPC idea above, but wrap each pointer in a dataspace. Is this possible? And is it efficient?

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VFS FIFO plugin
by Nobody III 16 Mar '18

16 Mar '18

I've started writing a (single-file) FIFO VFS plugin. I have gotten it to compile, but I still need a little help. How should I test my plugin? I'm not aware of a good run script to base a test on. How should I register signal handlers? I can use a list of List_element<Signal_context_capability>, but that requires extra dynamic memory allocations. How should I handle this to properly account for memory?

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how to use genode on riscv
by Dd Nirvana 16 Mar '18

16 Mar '18

Hi guys, I am so glad to know that genode has supported RISCV from v16.02. I have already read the article(http://genode.org/documentation/articles/riscv) which introduce how genode port the RISCV. However, I am still a little confused about how to build a runnable genode image and how to run it on riscv platform like spike. Could you give me any advices to do it? Thanks a lot! Dong Du

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Genode affinity, multi-core separation and service encapsulation (core inferences)
by Daniel Krefft 15 Mar '18

15 Mar '18

Hello, after an exhaustive evaluation of different scenarios for testing the coherent execution of components on distinct cores, the following question arises: Is it basically possible to separate a component running on core 1 completely (e.g. pd, ram, rom, log) from the remaining system running on core 0? Our results so far demonstrate that, in any case, a component running on core 1 utilizes at least the rom and log services provided by init which is running on core 0. Also the usage of a second level init component (which is suggested by the genode book) didn't change the resulting behavior. Of course, genode is not meant to be a separation kernel by design, but would it still be possible to map/assign resources/partitions to corresponding cores? Or do all components running on different cores still have to contact the genode CORE component which is running on core 0? Best regards Daniel -- Daniel Krefft MSc. Wissenschaftlicher Mitarbeiter Technische Universitaet Muenchen Fakultaet fuer Informatik Lehrstuhl fuer Betriebssysteme Arcisstrasse 21 80333 Muenchen Tel. +49 89 289 18791 daniel.krefft@...256... www.os.in.tum.de/personen/krefft

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base-linux IRQ session
by Johannes Kliemann 14 Mar '18

14 Mar '18

Hi all, I'm currently implementing the IRQ session on base-linux. If I understood the Foundations book correctly interrupts are waiting in a separate thread that locks when it is waiting and continues (and calls the handler) once an interrupt is triggered. According to this I have implemented a kernel module [1] that triggers interrupts via reads on a device file. The interrupt can be registered via ioctl on the file descriptor and the a blocking read is called that returns once the registered interrupts has been triggered. I have looked into the implementations of base-nova and base-hw but didn't completely understand it. As far as I understood the session component implements the session and only requires the interrupt number and a signal handler. The Irq_object implements the waiting thread but I didn't see where it is waiting for the interrupt. Also as far as I could see it the actual interrupt capability stays inside the session in core and only the signal handler capability is passed to the component. Is my understanding of this correct? And is there any further documentation on this? Regards, Johannes [1]: https://github.com/jklmnn/hwiodev/blob/c445eb58daa6d29e9f779bf6ad4b00818fba…

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std::stream::ignore ()
by Stefan 14 Mar '18

14 Mar '18

Hi there, currently I’m porting software for test purposes to the Genode OS. While trying to port OSG, I found out, that std::istream::ignore (long) seems to be missing. Is there an official workaround for this? Thank you very much! Stefan

2 1

Memory write tracing/logging of an application / Watchpoints in Genode/Fiasco.OC
by Stark, Josef 14 Mar '18

14 Mar '18

Hi all, I want to be able to 'trace' every memory write access of an arbitrary target application, in order to 'duplicate' those writes into another memory location. So that I would then have at all times one exact copy of the memory area (stack and heap) used by that application. My plan was to realize this with the help of a parent application, that acts as a session-proxy for the target, i.e. target requests a RAM-session from parent, which forwards the request to core and then provides the session to target; thus, the parent later knows which dataspaces/ memory areas are used by target. It could then flag that whole memory area with watchpoints. Hence, parent would be notified about all write accesses made by target and could consequently duplicate those writes in a secondary memory location. (I know that this would probably incur a slowdown factor of 10-1000 times, but that is allowed in this scenario.) Sadly, only now I have read that watchpoints are not implemented in Genode, and most probably neither are they in the underlying kernel, Fiasco.OC, which I have to use; breakpoints on the other hand seem to work just fine. My question is: Could there possibly be another way to achieve my goal, or do I have to bite the bullet and implement watchpoints myself? Thanks for bearing with me and for any hints at all. Best, Josef

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