Re: [PATCH 00/14] Add SPDX SBOM generation tool

[Greg KH <gregkh@linuxfoundation.org>]

On Mon, Jan 19, 2026 at 07:47:17AM +0100, Luis Augenstein wrote:
> This patch series introduces a Python-based tool for generating SBOM
> documents in the SPDX 3.0.1 format for kernel builds.
> 
> A Software Bill of Materials (SBOM) describes the individual components
> of a software product. For the kernel, the goal is to describe the
> distributable build outputs (typically the kernel image and modules),
> the source files involved in producing these outputs, and the build
> process that connects the source and output files.
> 
> To achieve this, the SBOM tool generates three SPDX documents:
> 
> - sbom-output.spdx.json
>   Describes the final build outputs together with high-level
>   build metadata.
> 
> - sbom-source.spdx.json
>   Describes all source files involved in the build, including
>   licensing information and additional file metadata.
> 
> - sbom-build.spdx.json
>   Describes the entire build process, linking source files
>   from the source SBOM to output files in the output SBOM.
> 
> The sbom tool is optional and runs only when CONFIG_SBOM is enabled. It
> is invoked after the build, once all output artifacts have been
> generated. Starting from the kernel image and modules as root nodes,
> the tool reconstructs the dependency graph up to the original source
> files. Build dependencies are primarily derived from the .cmd files
> generated by Kbuild, which record the full command used to build
> each output file.
> 
> Currently, the tool only supports x86 and arm64 architectures.
> 
> Co-developed-by: Maximilian Huber <maximilian.huber@tngtech.com>
> Signed-off-by: Maximilian Huber <maximilian.huber@tngtech.com>
> Signed-off-by: Luis Augenstein <luis.augenstein@tngtech.com>

This is great work, thank you so much for doing this!

Note, I just tested the series, on 6.19-rc6, and with CONFIG_SBOM
enabled, I get this following "message" at the end of the build when it
generates the sbom:

	make[3]: Nothing to be done for 'sbom'.

Is that intentional?

thanks,

greg k-h