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Hackaday · KernelCurated

Examining the Linux kernel safely with QEMU and GDB

Summary

Hackaday presents a script that downloads, configures and builds kernel sources and starts them as a debuggable Debian image under QEMU. It runs as a Python program. The kernels it produces can be built as Debian packages.

Ideas

  • The script downloads a chosen kernel version automatically.
  • Configuration patches prepare debugging and virtual hardware.
  • QEMU starts the test kernel without any risk to the host system.
  • GDB connects to the virtual kernel, which can be paused.

Insights

  • Virtualisation shortens kernel development through safe and repeatable experiments.
  • Automated environment setup makes difficult tools more accessible.
  • A reproducible test kernel separates code errors from host configurations.

Facts

  • The tool is called easylkb.

Recommendations

  • Keep symbol information that matches the kernel being tested.
  • Automate a minimal boot test after every change.

References

Read the original article

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