Implement BREAK for pseudo-terminals
a project by ptesarik
Updated almost 4 years ago. 5 hacker ♥️.

This will greatly enhance the usefulness of QEMU virtual serial ports, because the Linux kernel interprets a break on the serial console as a SysRq, but there is currently no way to pass this signal over a pseudo-terminal.

Join this project

Looking for hackers with the skills:

c kernel

This project is part of:

Hack Week 11

Activity

  • about 8 years ago: mkubecek liked this project.
  • about 11 years ago: rmax liked this project.
  • about 11 years ago: herbert0890 joined this project.
  • about 11 years ago: herbert0890 liked this project.
  • about 11 years ago: ptesarik started this project.
  • about 11 years ago: ptesarik liked this project.
  • over 11 years ago: e_bischoff liked this project.
  • over 11 years ago: ptesarik added keyword "kernel" to this project.
  • over 11 years ago: ptesarik added keyword "c" to this project.
  • over 11 years ago: ptesarik originated this project.


    • Comments

    • rmax
      about 11 years ago by rmax | Reply

      While being there, it might also make sense to transport things like baud rate settings and control/status lines across pseudo-terminals, because that would e.g. allow to transparently extend serial lines across the internet.

    Similar Projects

    Port OTPClient to GTK >= 4.18 by pstivanin

    Project Description

    OTPClient is currently using GTK3 and cannot easily be ported to GTK4. Since GTK4 came out, there have been quite some big changes. Also, there are now some new deprecation that will take effect with GTK5 (and are active starting from 4.10 as warnings), so I need to think ahead and port OTPClient without using any of those deprecated features.

    Goal for this Hackweek

    • fix the last 3 opened issues (https://github.com/paolostivanin/OTPClient/issues/402, https://github.com/paolostivanin/OTPClient/issues/404, https://github.com/paolostivanin/OTPClient/issues/406) and release a new version
    • continue the rewrite from where we left last year
    • if possible, finally close this 6 years old issue: https://github.com/paolostivanin/OTPClient/issues/123

    Smart lighting with Pico 2 by jmodak

    Description

    I am trying to create a smart-lighting project with a Raspberry Pi Pico that reacts to a movie's visuals and audio that involves combining two distinct functions: ambient screen lighting(visual response) and sound-reactive lighting(audio response)

    Goals

    • Visuals: Capturing the screen's colour requires an external device to analyse screen content and send colour data to the MCU via serial communication.
    • Audio: A sound sensor module connected directly to the Pico that can detect sound volume.
    • Pico 2W: The MCU receives data fro, both inputs and controls an LED strip.

    Resources

    • Raspberry Pi Pico 2 W
    • RGB LED strip
    • Sound detecting sensor
    • Power supply
    • breadboard and wires

    pudc - A PID 1 process that barks to the internet by mssola

    Description

    As a fun exercise in order to dig deeper into the Linux kernel, its interfaces, the RISC-V architecture, and all the dragons in between; I'm building a blog site cooked like this:

    • The backend is written in a mixture of C and RISC-V assembly.
    • The backend is actually PID1 (for real, not within a container).
    • We poll and parse incoming HTTP requests ourselves.
    • The frontend is a mere HTML page with htmx.

    The project is meant to be Linux-specific, so I'm going to use io_uring, pidfs, namespaces, and Linux-specific features in order to drive all of this.

    I'm open for suggestions and so on, but this is meant to be a solo project, as this is more of a learning exercise for me than anything else.

    Goals

    • Have a better understanding of different Linux features from user space down to the kernel internals.
    • Most importantly: have fun.

    Resources

    Add a machine-readable output to dmidecode by jdelvare

    Description

    There have been repeated requests for a machine-friendly dmidecode output over the last decade. During Hack Week 19, 5 years ago, I prepared the code to support alternative output formats, but didn't have the time to go further. Last year, Jiri Hnidek from Red Hat Linux posted a proof-of-concept implementation to add JSON output support. This is a fairly large pull request which needs to be carefully reviewed and tested.

    Goals

    Review Jiri's work and provide constructive feedback. Merge the code if acceptable. Evaluate the costs and benefits of using a library such as json-c.

    Improve the picotm Transaction Manager by tdz

    Picotm is a system-level transaction manager. It provides transactional semantics to low-level C operations, such as

    • memory access,
    • modifying data structures,
    • (some) file I/O, and
    • common interfaces from the C Standard Library and POSIX.

    Picotm also handles error detection and recovery for all it's functionality. It's fully modular, so new functionality can be added.

    For the Hackweek, I want to dedicate some time to picotm. I want to finish some of the refactoring work that I have been working on. If there's time left, I'd like to investigate two-phase commits and how to support them in picotm.

    Picotm is available at http://picotm.org/.

    Backporting patches using LLM by jankara

    Description

    Backporting Linux kernel fixes (either for CVE issues or as part of general git-fixes workflow) is boring and mostly mechanical work (dealing with changes in context, renamed variables, new helper functions etc.). The idea of this project is to explore usage of LLM for backporting Linux kernel commits to SUSE kernels using LLM.

    Goals

    • Create safe environment allowing LLM to run and backport patches without exposing the whole filesystem to it (for privacy and security reasons).
    • Write prompt that will guide LLM through the backporting process. Fine tune it based on experimental results.
    • Explore success rate of LLMs when backporting various patches.

    Resources

    • Docker
    • Gemini CLI

    Repository

    Current version of the container with some instructions for use are at: https://gitlab.suse.de/jankara/gemini-cli-backporter

    dynticks-testing: analyse perf / trace-cmd output and aggregate data by m.crivellari

    Description

    dynticks-testing is a project started years ago by Frederic Weisbecker. One of the feature is to check the actual configuration (isolcpus, irqaffinity etc etc) and give feedback on it.

    An important goal of this tool is to parse the output of trace-cmd / perf and provide more readable data, showing the duration of every events grouped by PID (showing also the CPU number, if the tasks has been migrated etc).

    An example of data captured on my laptop (incomplete!!):

              -0     [005] dN.2. 20310.270699: sched_wakeup:         WaylandProxy:46380 [120] CPU:005
          -0     [005] d..2. 20310.270702: sched_switch:         swapper/5:0 [120] R ==> WaylandProxy:46380 [120]
...
    WaylandProxy-46380 [004] d..2. 20310.295397: sched_switch:         WaylandProxy:46380 [120] S ==> swapper/4:0 [120]
          -0     [006] d..2. 20310.295397: sched_switch:         swapper/6:0 [120] R ==> firefox:46373 [120]
         firefox-46373 [006] d..2. 20310.295408: sched_switch:         firefox:46373 [120] S ==> swapper/6:0 [120]
          -0     [004] dN.2. 20310.295466: sched_wakeup:         WaylandProxy:46380 [120] CPU:004

    Output of noise_parse.py:

    Task: WaylandProxy Pid: 46380 cpus: {4, 5} (Migrated!!!)
        Wakeup Latency                                Nr:        24     Duration:          89
        Sched switch: kworker/12:2                    Nr:         1     Duration:           6

    My first contribution is around Nov. 2024!

    Goals

    • add more features (eg cpuset)
    • test / bugfix

    Resources

    Progresses

    isolcpus and cpusets implemented and merged in master: dynticks-testing.git commit

    Add Qualcomm Snapdragon 765G (SM7250) basic device tree to mainline linux kernel by pvorel

    Qualcomm Snapdragon 765G (SM7250) (smartphone SoC) has no support in the linux kernel, nor in u-boot. Try to add basic device tree support. The hardest part will be to create boot.img which will be accepted by phone.

    UART is available for smartphone :).

    pudc - A PID 1 process that barks to the internet by mssola

    Description

    As a fun exercise in order to dig deeper into the Linux kernel, its interfaces, the RISC-V architecture, and all the dragons in between; I'm building a blog site cooked like this:

    • The backend is written in a mixture of C and RISC-V assembly.
    • The backend is actually PID1 (for real, not within a container).
    • We poll and parse incoming HTTP requests ourselves.
    • The frontend is a mere HTML page with htmx.

    The project is meant to be Linux-specific, so I'm going to use io_uring, pidfs, namespaces, and Linux-specific features in order to drive all of this.

    I'm open for suggestions and so on, but this is meant to be a solo project, as this is more of a learning exercise for me than anything else.

    Goals

    • Have a better understanding of different Linux features from user space down to the kernel internals.
    • Most importantly: have fun.

    Resources

    Improve UML page fault handler by ptesarik

    Description

    Improve UML handling of segmentation faults in kernel mode. Although such page faults are generally caused by a kernel bug, it is annoying if they cause an infinite loop, or panic the kernel. More importantly, a robust implementation allows to write KUnit tests for various guard pages, preventing potential kernel self-protection regressions.

    Goals

    Convert the UML page fault handler to use oops_* helpers, go through a few review rounds and finally get my patch series merged in 6.14.

    Resources

    Wrong initial attempt: https://lore.kernel.org/lkml/20231215121431.680-1-petrtesarik@huaweicloud.com/T/