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.
This project is part of:
Hack Week 11
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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
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
x64id: An x86/x64 instruction disassembler by m.crivellari
Description
This is an old side project. An x86/x64 machine code decoder. It is useful to get instructions' length and identify each of its fields.
Example:
C7 85 68 FF FF FF 00 00 00 00
This is the instruction:
MOV DWORD PTR SS:[LOCAL.38],0
What follows are some of the information collected by the disassembler, based on the specific instruction:
RAW bytes (hex): C7 85 68 FF FF FF 00 00 00 00
Instr. length: 10
Print instruction fields:
Located Prefixes 0:
OP: 0xC7
mod_reg_rm: 0x85
disp (4): 0xFFFFFF68
Iimm: 0x0
Lacks the mnemonic representation: from the previous machine code is not able to produce the "MOV..." instruction, for example.
Goals
The goal is almost easy: partially implement the mnemonic representation. I have already started during the weekend, likely tomorrow I will push the branch!
Resources
- The project: https://github.com/DispatchCode/x64-Instruction-Decoder/
- This is useful to avoid gdb and objdump in local: https://defuse.ca/online-x86-assembler.htm
- Another interesting resource is https://godbolt.org/
Progress
- An initial implementation can be found at: https://github.com/DispatchCode/x64-Instruction-Decoder/tree/mnemonic-support It is described under the "Mnemonic translation" in the README file!
Let's consider this example:
[...other bytes...] 43 89 44 B5 00 01 00 [...other bytes...]
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.
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
bpftrace contribution by mkoutny
Description
bpftrace is a great tool, no need to sing odes to it here. It can access any kernel data and process them in real time. It provides helpers for some common Linux kernel structures but not all.
Goals
- set up bpftrace toolchain
- learn about bpftrace implementation and internals
- implement support for
percpu_counters - look into some of the first issues
- send a refined PR (on Thu)
Resources
early stage kdump support by mbrugger
Project Description
When we experience a early boot crash, we are not able to analyze the kernel dump, as user-space wasn't able to load the crash system. The idea is to make the crash system compiled into the host kernel (think of initramfs) so that we can create a kernel dump really early in the boot process.
Goal for the Hackweeks
- Investigate if this is possible and the implications it would have (done in HW21)
- Hack up a PoC (done in HW22 and HW23)
- Prepare RFC series (giving it's only one week, we are entering wishful thinking territory here).
update HW23
- I was able to include the crash kernel into the kernel Image.
- I'll need to find a way to load that from
init/main.c:start_kernel()probably afterkcsan_init() - I workaround for a smoke test was to hack
kexec_file_load()systemcall which has two problems:- My initramfs in the porduction kernel does not have a new enough kexec version, that's not a blocker but where the week ended
- As the crash kernel is part of init.data it will be already stale once I can call
kexec_file_load()from user-space.
The solution is probably to rewrite the POC so that the invocation can be done from init.text (that's my theory) but I'm not sure if I can reuse the kexec infrastructure in the kernel from there, which I rely on heavily.
update HW24
- Day1
- rebased on v6.12 with no problems others then me breaking the config
- setting up a new compilation and qemu/virtme env
- getting desperate as nothing works that used to work
- Day 2
- getting to call the invocation of loading the early kernel from
__initafterkcsan_init()
- getting to call the invocation of loading the early kernel from
Day 3
- fix problem of memdup not being able to alloc so much memory... use 64K page sizes for now
- code refactoring
- I'm now able to load the crash kernel
- When using virtme I can boot into the crash kernel, also it doesn't boot completely (major milestone!), crash in
elfcorehdr_read_notes()
Day 4
- crash systems crashes (no pun intended) in
copy_old_mempage()link; will need to understand elfcorehdr... - call path
vmcore_init() -> parse_crash_elf_headers() -> elfcorehdr_read() -> read_from_oldmem() -> copy_oldmem_page() -> copy_to_iter()
- crash systems crashes (no pun intended) in
Day 5
- hacking
arch/arm64/kernel/crash_dump.c:copy_old_mempage()to see if crash system really starts. It does. - fun fact: retested with more reserved memory and with UEFI FW, host kernel crashes in init but directly starts the crash kernel, so it works (somehow) \o/
- hacking
update HW25
- Day 1
- rebased crash-kernel on v6.12.59 (for now), still crashing
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
- Frederic's public repository: https://git.kernel.org/pub/scm/linux/kernel/git/frederic/dynticks-testing.git/
- https://docs.kernel.org/timers/no_hz.html#testing
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 :).