[PATCH] meta: fix generation of kernel CONFIG_ in SPDX3

Benjamin Robin
2026-02-13T09:26:51Z

With the current solution, using a separate task
(do_create_kernel_config_spdx) there is a dependency issue. Sometimes
the final rootfs SBOM does not contain the CONFIG_ values.

do_create_kernel_config_spdx is executed after do_create_spdx which
deploys the SPDX file. do_create_kernel_config_spdx calls
oe.sbom30.find_root_obj_in_jsonld to read from the deploy directory,
which is OK, but the do_create_kernel_config_spdx ends up writing to
this deployed file (updating it).

do_create_rootfs_spdx has an explicit dependency to all do_create_spdx
tasks, but there is nothing that prevents executing
do_create_kernel_config_spdx after do_create_rootfs_spdx.

To fix it, instead, now read from the workdir, and write to the
workdir, and do the processing from the do_create_spdx task:
we append to the do_create_spdx task.

Also only execute this task if create-spdx-3.0 was inherited,
previously this code could be executed if create-spdx-2.2 is
inherited.

Fixes: 228a968e7c47 ("kernel.bbclass: Add task to export kernel configuration to SPDX")
Signed-off-by: Benjamin Robin (Schneider Electric) <benjamin.robin@bootlin.com>
---
meta/classes-recipe/kernel.bbclass | 22 ++++++++++------------
1 file changed, 10 insertions(+), 12 deletions(-)

diff --git a/meta/classes-recipe/kernel.bbclass b/meta/classes-recipe/kernel.bbclass
index f989b31c477c..ce43f6c13036 100644
--- a/meta/classes-recipe/kernel.bbclass
+++ b/meta/classes-recipe/kernel.bbclass
@@ -864,13 +864,9 @@ addtask deploy after do_populate_sysroot do_packagedata

EXPORT_FUNCTIONS do_deploy

-python __anonymous() {
- inherits = (d.getVar("INHERIT") or "")
- if "create-spdx" in inherits:
- bb.build.addtask('do_create_kernel_config_spdx', 'do_populate_lic do_deploy', 'do_create_spdx', d)
-}
-
-python do_create_kernel_config_spdx() {
+do_create_spdx:append() {
+ if not bb.data.inherits_class("create-spdx-3.0", d):
+ return
if d.getVar("SPDX_INCLUDE_KERNEL_CONFIG", True) == "1":
import oe.spdx30
import oe.spdx30_tasks
@@ -903,9 +899,11 @@ python do_create_kernel_config_spdx() {
except Exception as e:
bb.error(f"Failed to parse kernel config file: {e}")

- build, build_objset = oe.sbom30.find_root_obj_in_jsonld(
- d, "recipes", f"recipe-{pn}", oe.spdx30.build_Build
- )
+ path = oe.sbom30.jsonld_arch_path(d, pkg_arch, "recipes", f"recipe-{pn}", deploydir=deploydir)
+ build_objset = oe.sbom30.load_jsonld(d, path, required=True)
+ build = build_objset.find_root(oe.spdx30.build_Build)
+ if not build:
+ bb.fatal("No root %s found in %s" % (oe.spdx30.build_Build.__name__, path))

kernel_build = build_objset.add_root(
oe.spdx30.build_Build(
@@ -924,9 +922,9 @@ python do_create_kernel_config_spdx() {
[kernel_build]
)

- oe.sbom30.write_jsonld_doc(d, build_objset, deploydir / pkg_arch / "recipes" / f"recipe-{pn}.spdx.json")
+ oe.sbom30.write_jsonld_doc(d, build_objset, path)
}
-do_create_kernel_config_spdx[depends] = "virtual/kernel:do_configure"
+do_create_spdx[depends] += "virtual/kernel:do_configure"

# Add using Device Tree support
inherit kernel-devicetree

---
base-commit: 3a8f0075d52cb653118774baa03aa8d5231f943c
change-id: 20260213-fix-kernel-config-spdx-99223936e69f

Best regards,
--
Benjamin Robin (Schneider Electric) <benjamin.robin@bootlin.com>