> -----Original Message-----
> From: [email protected]
> <[email protected]> On Behalf Of vboudevin via
> lists.openembedded.org
> Sent: den 16 januari 2026 20:05
> To: [email protected]
> Cc: [email protected]; [email protected];
> [email protected]; ValentinBoudevin <[email protected]>
> Subject: [OE-core] [PATCH v5 2/4] generate-cve-exclusions: Add a .bbclass
The prefix should match the class name.
>
> Add a new class named kernel-generate-cve-exclusions.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
> kernel-generate-cve-exclusions.bbclass"
> 2) Turn the variable ENABLE_KERNEL_CVE_EXCLUSIONS to "1".
> 3) 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
>
> The class also provides some variables:
> *ENABLE_KERNEL_CVE_EXCLUSIONS: Enable/Disable this class (off by default
> to not affect linux-yocto OE example)
> *GENERATE_CVE_EXCLUSIONS_SRC_URI and GENERATE_CVE_EXCLUSIONS_SRCREV can
> be used to change the source repository or fix a commit with SRCREV
> (usefull for deterministic testing)
> *GENERATE_CVE_EXCLUSIONS_NETWORK can be set to 0 to provide an offline
> mode based on DL_DIR directory.
> *GENERATE_CVE_EXCLUSIONS_WORKDIR path used as a working directory for
> this class
> *GENERATE_CVE_EXCLUSIONS_DESTSUFFIX suffix used for the git unpack
> *GENERATE_CVE_EXCLUSIONS_UNPACK_DIR path of the unpack for the git
> repository
>
> Signed-off-by: Valentin Boudevin <[email protected]>
> ---
> .../kernel-generate-cve-exclusions.bbclass | 135 ++++++++++++++++++
> 1 file changed, 135 insertions(+)
> create mode 100644 meta/classes/kernel-generate-cve-exclusions.bbclass
>
> diff --git a/meta/classes/kernel-generate-cve-exclusions.bbclass
> b/meta/classes/kernel-generate-cve-exclusions.bbclass
> new file mode 100644
> index 0000000000..cd81cc5899
> --- /dev/null
> +++ b/meta/classes/kernel-generate-cve-exclusions.bbclass
> @@ -0,0 +1,135 @@
> +# Generate CVE exclusions for the kernel build (set to "1" to enable)
> +ENABLE_KERNEL_CVE_EXCLUSIONS ?= "0"
> +
> +# CVE exclusions source repository settings
> +GENERATE_CVE_EXCLUSIONS_SRC_URI ?=
> "git://github.com/CVEProject/cvelistV5.git;branch=main;protocol=https"
> +GENERATE_CVE_EXCLUSIONS_SRCREV ?= "${@bb.fetch2.get_autorev(d)}"
> +GENERATE_CVE_EXCLUSIONS_NETWORK ?= "1"
> +GENERATE_CVE_EXCLUSIONS_WORKDIR ?= "${WORKDIR}/cvelistV5"
> +GENERATE_CVE_EXCLUSIONS_DESTSUFFIX ?= "git"
> +GENERATE_CVE_EXCLUSIONS_UNPACK_DIR ?=
> "${GENERATE_CVE_EXCLUSIONS_WORKDIR}/${GENERATE_CVE_EXCLUSIONS_DESTSUFFIX}"
> +
> +python __anonymous() {
> + # Only run if CVE exclusions are enabled
> + if d.getVar("ENABLE_KERNEL_CVE_EXCLUSIONS", True) == "1":
> + srcrev = d.getVar("GENERATE_CVE_EXCLUSIONS_SRCREV", True) or ""
> + network = d.getVar("GENERATE_CVE_EXCLUSIONS_NETWORK", True) or "0"
> + # Check offline mode with AUTOREV-like SRCREV
> + if network == "0" and srcrev.strip() in ("${AUTOREV}", "AUTOINC",
> "INVALID"):
> + bb.fatal("generate-cve-exclusions: Offline mode but SRCREV is
> set to AUTOREV/AUTOINC/INVALID. "
> + "Cannot proceed without network access or use a fixed
> SRCREV.")
> + d.appendVar("SRC_URI", "
> ${GENERATE_CVE_EXCLUSIONS_SRC_URI};name=generate-cve-exclusions;destsuffix=${GENERATE_CVE_EXCLUSIONS_DESTSUFFIX}")
> + d.setVar("SRCREV_generate-cve-exclusions",
> d.getVar("GENERATE_CVE_EXCLUSIONS_SRCREV"))
> +}
> +
> +python do_clone_cvelistV5() {
> + import subprocess
> + import shutil, os
> + # Only run if CVE exclusions are enabled
> + if not d.getVar("ENABLE_KERNEL_CVE_EXCLUSIONS") == "1":
> + return
> + network_allowed = d.getVar("GENERATE_CVE_EXCLUSIONS_NETWORK") == "1"
> + workdir = d.getVar("GENERATE_CVE_EXCLUSIONS_WORKDIR")
> + unpack_dir = d.getVar("GENERATE_CVE_EXCLUSIONS_UNPACK_DIR")
> + # Remove existing unpacked directory if any
> + if os.path.exists(workdir):
> + shutil.rmtree(workdir)
> + # Prepare fetcher
> + src_uri_list = (d.getVar('SRC_URI') or "").split()
> + cve_uris = []
> + for uri in src_uri_list:
> + if "name=generate-cve-exclusions" in uri:
> + cve_uris.append(uri)
> + if not cve_uris:
> + bb.note("No CVE exclusions SRC_URI found, skipping fetch")
> + return
> + fetcher = bb.fetch2.Fetch(cve_uris, d)
> + # Clone only if network is allowed
> + if network_allowed:
> + fetcher.download()
> + else:
> + # Offline mode without network access
> + bb.note("GENERATE_CVE_EXCLUSIONS_NETWORK=0: Skipping online fetch.
> Checking local downloads in DL_DIR...")
> + have_sources = False
> + dl_dir = d.getVar("DL_DIR")
> + srcrev = d.getVar("SRCREV_generate-cve-exclusions")
> + bb.note(f"Checking for sources for SRCREV: {srcrev}")
> + # Check SRCREV is NOT set to AUTOREV
> + if srcrev.strip() in ("${AUTOREV}", "AUTOINC", "INVALID"):
> + bb.fatal("generate-cve-exclusions: Offline mode but SRCREV is
> set to AUTOREV/AUTOINC/INVALID. Cannot proceed without network access or use
> a fixed SRCREV.")
> + return
> + # Loop through the fetcher's expanded URL data
> + for ud in fetcher.expanded_urldata():
> + ud.setup_localpath(d)
> + # Check mirror tarballs first
> + for mirror_fname in ud.mirrortarballs:
> + mirror_path = os.path.join(dl_dir, mirror_fname)
> + if os.path.exists(mirror_path):
> + bb.note(f"Found mirror tarball: {mirror_path}")
> + have_sources = True
> + break
> + # If no mirror, check original download path
> + if not have_sources and ud.localpath and
> os.path.exists(ud.localpath):
> + bb.note(f"Found local download: {ud.localpath}")
> + have_sources = True
> + if not have_sources:
> + bb.fatal("generate-cve-exclusions: Offline mode but required
> source is missing.\n"f"SRC_URI = {ud.url}")
> + return
> + # Unpack into the standard work directory
> + fetcher.unpack(unpack_dir)
> + # Remove the folder ${PN} set by unpack
> + subdirs = [d for d in os.listdir(unpack_dir) if
> os.path.isdir(os.path.join(unpack_dir, d))]
> + if len(subdirs) == 1:
> + srcdir = os.path.join(unpack_dir, subdirs[0])
> + for f in os.listdir(srcdir):
> + shutil.move(os.path.join(srcdir, f), unpack_dir)
> + shutil.rmtree(srcdir)
> + bb.note("Vulnerabilities repo unpacked into: %s" % unpack_dir)
> +}
> +do_clone_cvelistV5[network] = "${GENERATE_CVE_EXCLUSIONS_NETWORK}"
> +do_clone_cvelistV5[nostamp] = "1"
> +do_clone_cvelistV5[doc] = "Clone CVE information from the CVE Project:
> https://github.com/CVEProject/cvelistV5.git";
> +addtask clone_cvelistV5 before do_generate_cve_exclusions
> +
> +do_generate_cve_exclusions() {
> + # Only run if CVE exclusions are enabled
> + if [ "${ENABLE_KERNEL_CVE_EXCLUSIONS}" != "1" ]; then
> + return 0
> + fi
> +
> generate_cve_exclusions_script=${COREBASE}/scripts/contrib/generate-cve-exclusions.py
> + if [ ! -f "${generate_cve_exclusions_script}" ]; then
> + bbwarn "generate-cve-exclusions.py not found in ${COREBASE}."
> + return 0
> + fi
> + if [ ! -d "${GENERATE_CVE_EXCLUSIONS_UNPACK_DIR}" ]; then
> + bbwarn "CVE exclusions source directory not found in
> ${GENERATE_CVE_EXCLUSIONS_UNPACK_DIR}."
> + return 0
> + fi
> + python3 "${generate_cve_exclusions_script}" \
> + "${GENERATE_CVE_EXCLUSIONS_UNPACK_DIR}" \
> + ${LINUX_VERSION} \
> + --output-json >
> ${GENERATE_CVE_EXCLUSIONS_WORKDIR}/cve-exclusion_${LINUX_VERSION}.json
> + bbplain "CVE exclusions generated for kernel version ${LINUX_VERSION} at
> ${GENERATE_CVE_EXCLUSIONS_WORKDIR}/cve-exclusion_${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 before do_cve_check
> +
> +python do_cve_check:prepend() {
> + import os
> + import json
> + workdir = d.getVar("GENERATE_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):
> + 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))
> +}
> \ No newline at end of file
Please add a newline at the end.
//Peter
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