[v3,2/4] generate-cve-exclusions: Add a .bbclass

Add a .bbclass to generate-cve-exclusions to use this script at every
run.

Two steps for testing:
1) Inherit this class in the kernel recipe with "inherit
   generate-cve-exclusions.bbclass"
2) Use the following command to generate a cvelistV5 entry with a JSON
   file in in ${WORKDIR}/cvelistV5/ :
   "bitbake linux-yocto -c generate-cve-exclusions"

The JSON file can then be parsed in the following run by cve-check.

This class contains several methods:

*do_clone_cvelistV5: Clone the cvelistV5 repo in
${WORKDIR}/cvelistV5/git

(e.g. bitbake-builds/poky-master/build/tmp/work/qemux86_64-poky-linux/
linux-yocto/6.18.1+git/cvelistV5/git)

*do_generate_cve_exclusions: Use the script generate-cve-exclusions.py.
It uses the new "--output-json" argument to generate a JSON file as an
output stored in ${WORKDIR}/cvelistV5//cve-exclusion_${LINUX_VERSION}.json

*do_cve_check:prepend: Parse the previously generated JSON file to set
the variable CVE_STATUS corretly

Signed-off-by: Valentin Boudevin <valentin.boudevin@gmail.com>
---
 meta/classes/generate-cve-exclusions.bbclass | 67 ++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 meta/classes/generate-cve-exclusions.bbclass

> -----Original Message-----
> From: openembedded-core@lists.openembedded.org <openembedded-
> core@lists.openembedded.org> On Behalf Of vboudevin via
> lists.openembedded.org
> Sent: Tuesday, 6 January 2026 21:47
> To: openembedded-core@lists.openembedded.org
> Cc: ValentinBoudevin <valentin.boudevin@gmail.com>
> Subject: [OE-core] [PATCH v3 2/4] generate-cve-exclusions: Add a .bbclass
>
> Add a .bbclass to generate-cve-exclusions to use this script at every run.
>
> Two steps for testing:
> 1) Inherit this class in the kernel recipe with "inherit
>    generate-cve-exclusions.bbclass"
> 2) Use the following command to generate a cvelistV5 entry with a JSON
>    file in in ${WORKDIR}/cvelistV5/ :
>    "bitbake linux-yocto -c generate-cve-exclusions"
>
> The JSON file can then be parsed in the following run by cve-check.
>
> This class contains several methods:
>
> *do_clone_cvelistV5: Clone the cvelistV5 repo in ${WORKDIR}/cvelistV5/git
>
> (e.g. bitbake-builds/poky-master/build/tmp/work/qemux86_64-poky-linux/
> linux-yocto/6.18.1+git/cvelistV5/git)
>
> *do_generate_cve_exclusions: Use the script generate-cve-exclusions.py.
> It uses the new "--output-json" argument to generate a JSON file as an output
> stored in ${WORKDIR}/cvelistV5//cve-exclusion_${LINUX_VERSION}.json
>
> *do_cve_check:prepend: Parse the previously generated JSON file to set the
> variable CVE_STATUS corretly
>
> Signed-off-by: Valentin Boudevin <valentin.boudevin@gmail.com>
> ---
>  meta/classes/generate-cve-exclusions.bbclass | 67 ++++++++++++++++++++
>  1 file changed, 67 insertions(+)
>  create mode 100644 meta/classes/generate-cve-exclusions.bbclass
>
> diff --git a/meta/classes/generate-cve-exclusions.bbclass
> b/meta/classes/generate-cve-exclusions.bbclass
> new file mode 100644
> index 0000000000..254ea5531d
> --- /dev/null
> +++ b/meta/classes/generate-cve-exclusions.bbclass
> @@ -0,0 +1,67 @@
> +CVE_EXCLUSIONS_WORKDIR ?= "${WORKDIR}/cvelistV5"
> +CVELISTV5_PATH ?= "${CVE_EXCLUSIONS_WORKDIR}/git"
> +
> +python do_clone_cvelistV5() {
> +    import subprocess
> +    import shutil, os
> +    rootdir = d.getVar("CVELISTV5_PATH")
> +    d.setVar("SRC_URI",
> "git://github.com/CVEProject/cvelistV5.git;branch=main;protocol=https")
> +    d.setVar("SRCREV", "${AUTOREV}")
Same comment as the other email regarding AUTOREV and reproducible and offline builds using mirrors.

> +    src_uri = (d.getVar('SRC_URI') or "").split()
> +    # Fetch the kernel vulnerabilities sources
> +    fetcher = bb.fetch2.Fetch(src_uri, d)
> +    fetcher.download()
> +    # Unpack into the standard work directory
> +    fetcher.unpack(rootdir)
> +    # Remove the folder ${PN} set by unpack
> +    subdirs = [d for d in os.listdir(rootdir) if os.path.isdir(os.path.join(rootdir, d))]
> +    if len(subdirs) == 1:
> +        srcdir = os.path.join(rootdir, subdirs[0])
> +        for f in os.listdir(srcdir):
> +            shutil.move(os.path.join(srcdir, f), rootdir)
> +        shutil.rmtree(srcdir)
> +    bb.note("Vulnerabilities repo unpacked into: %s" % rootdir) }
> +do_clone_cvelistV5[network] = "1"
> +do_clone_cvelistV5[nostamp] = "1"
> +do_clone_cvelistV5[doc] = "Clone CVE information from the CVE Project:
> https://github.co/
> m%2FCVEProject%2FcvelistV5.git&data=05%7C02%7Cdaniel.turull%40ericsson.c
> om%7C3b56ca9a146149d141dd08de4d64bd6f%7C92e84cebfbfd47abbe52080c6
> b87953f%7C0%7C0%7C639033292229191613%7CUnknown%7CTWFpbGZsb3d8
> eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiT
> WFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=rvOYYuld78txVFfm1jnu7fo
> EP12SNCfxSdN6MHHv4nk%3D&reserved=0"
> +addtask clone_cvelistV5 before do_generate_cve_exclusions
> +
> +do_generate_cve_exclusions() {
> +    generate_cve_exclusions_script=$(find ${COREBASE} -name "generate-cve-
> exclusions.py")
> +    if [ -z "${generate_cve_exclusions_script}" ]; then
> +        bbfatal "generate-cve-exclusions.py not found in ${COREBASE}."
> +    fi
> +    python3 "${generate_cve_exclusions_script}" \
> +        ${CVELISTV5_PATH} \
> +        ${LINUX_VERSION} \
> +        --output-json >
> +${CVE_EXCLUSIONS_WORKDIR}/cve-exclusion_${LINUX_VERSION}.json
> +}
> +do_generate_cve_exclusions[nostamp] = "1"
> +do_generate_cve_exclusions[doc] = "Generate CVE exclusions for the kernel
> build. (e.g., cve-exclusion_6.12.inc)"
> +addtask generate_cve_exclusions after do_clone_cvelistV5
> +
> +python do_cve_check:prepend() {
> +    import os
> +    import json
> +
> +    workdir = d.getVar("CVE_EXCLUSIONS_WORKDIR")
> +    kernel_version = d.getVar("LINUX_VERSION")
> +    json_input_file = os.path.join(workdir, "cve-exclusion_%s.json" %
> + kernel_version)
> +
> +    if os.path.exists(json_input_file):
> +        with open(json_input_file, 'r', encoding='utf-8') as f:
> +            cve_data = json.load(f)
> +        cve_status_dict = cve_data.get("cve_status", {})
> +        count = 0
> +        for cve_id, info in cve_status_dict.items():
> +            if info.get("active", True):
> +                # Skip active CVEs
> +                continue
> +            d.setVarFlag("CVE_STATUS", cve_id, info.get("message", ""))
> +            count += 1
> +
> +        bb.note("Loaded %d CVE_STATUS entries from JSON output for kernel %s"
> % (count, kernel_version))
> +    else:
> +        bb.warn("CVE exclusion JSON not found: %s. Skipping CVE_STATUS
> +updates" % json_input_file) }
> \ No newline at end of file