You need to sign in or sign up before continuing.

Description

My studies as well my spare time are dedicated to the Linux Kernel. Currently I'm focusing on interrupts on x86_64, but my interests are not restricted to one specific topic, for now.

I also "played" a little bit with kernel modules (ie lantern, a toy packet analyzer) and I've added a new syscall in order read from a task A, the memory of a task B.

Maybe this will be a good chance to...

Goals

  • create my first kernel patch

Resources

Achivements

Looking for hackers with the skills:

kernel kerneldevelopment

This project is part of:

Hack Week 24

Activity

  • 10 months ago: m.crivellari joined this project.
  • 11 months ago: ptesarik liked this project.
  • 11 months ago: zzaimeche liked this project.
  • 11 months ago: HvdHeuvel liked this project.
  • 11 months ago: m.crivellari added keyword "kernel" to this project.
  • 11 months ago: m.crivellari added keyword "kerneldevelopment" to this project.
  • 11 months ago: fanyadan liked this project.
  • 11 months ago: barendartchuk liked this project.
  • 11 months ago: lthadeus liked this project.
  • 11 months ago: osalvador liked this project.
  • 11 months ago: mbrugger liked this project.
  • 11 months ago: rmarliere liked this project.
  • 11 months ago: vliaskovitis liked this project.
  • 11 months ago: jmodak started this project.
  • 11 months ago: jmodak liked this project.
  • 11 months ago: m.crivellari originated this project.

  • Comments

    Be the first to comment!

    Similar Projects

    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

    1. Investigate if this is possible and the implications it would have (done in HW21)
    2. Hack up a PoC (done in HW22 and HW23)
    3. 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 after kcsan_init()
    • I workaround for a smoke test was to hack kexec_file_load() systemcall which has two problems:
      1. My initramfs in the porduction kernel does not have a new enough kexec version, that's not a blocker but where the week ended
      2. 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 __init after kcsan_init()
    • 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()
    • 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/
    • TODOs

      • fix elfcorehdr so that we actually can make use of all this...
      • test where in the boot __init() chain we can/should call kexec_early_dump()


    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, 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