[PATCH v2 1/6] linux-vulns: fetch kernel.org CNA info

[<daniel.turull@ericsson.com>]

From: Daniel Turull <daniel.turull@ericsson.com>

Add CVE data source for kernel.org.

It includes more information than the one provided by NVD.
Use similar mechanism and same variables as cve-check to define
when to update.

To use without internet access, change variable VULNS_URL to a local
copy or mirror.

CC: Peter Marko <peter.marko@siemens.com>
Signed-off-by: Daniel Turull <daniel.turull@ericsson.com>
---
 meta/conf/distro/include/maintainers.inc  |  1 +
 meta/recipes-core/meta/linux-vulns_git.bb | 76 +++++++++++++++++++++++
 2 files changed, 77 insertions(+)
 create mode 100644 meta/recipes-core/meta/linux-vulns_git.bb

diff --git a/meta/conf/distro/include/maintainers.inc b/meta/conf/distro/include/maintainers.inc
index 8065287c17..ec427fe6a4 100644
--- a/meta/conf/distro/include/maintainers.inc
+++ b/meta/conf/distro/include/maintainers.inc
@@ -468,6 +468,7 @@ RECIPE_MAINTAINER:pn-lighttpd = "Unassigned <unassigned@yoctoproject.org>"
 RECIPE_MAINTAINER:pn-linux-dummy = "Unassigned <unassigned@yoctoproject.org>"
 RECIPE_MAINTAINER:pn-linux-firmware = "Otavio Salvador <otavio.salvador@ossystems.com.br>"
 RECIPE_MAINTAINER:pn-linux-libc-headers = "Bruce Ashfield <bruce.ashfield@gmail.com>"
+RECIPE_MAINTAINER:pn-linux-vulns = "Unassigned <unassigned@yoctoproject.org>"
 RECIPE_MAINTAINER:pn-linux-yocto = "Bruce Ashfield <bruce.ashfield@gmail.com>"
 RECIPE_MAINTAINER:pn-linux-yocto-dev = "Bruce Ashfield <bruce.ashfield@gmail.com>"
 RECIPE_MAINTAINER:pn-linux-yocto-rt = "Bruce Ashfield <bruce.ashfield@gmail.com>"
diff --git a/meta/recipes-core/meta/linux-vulns_git.bb b/meta/recipes-core/meta/linux-vulns_git.bb
new file mode 100644
index 0000000000..fc48558eb8
--- /dev/null
+++ b/meta/recipes-core/meta/linux-vulns_git.bb
@@ -0,0 +1,76 @@
+SUMMARY = "CVE information from kernel.org"
+DESCRIPTION = "Repo for tracking and maintaining the CVE identifiers reserved \
+and assigned to the Linux kernel project."
+HOMEPAGE = "https://git.kernel.org/pub/scm/linux/security/vulns.git/about/"
+LICENSE = "GPL-2.0-only & cve-tou"
+SECTION = "base"
+
+INHIBIT_DEFAULT_DEPS = "1"
+
+inherit native
+inherit nopackages
+
+VULNS_URL ?= "https://git.kernel.org/pub/scm/linux/security/vulns"
+CVE_CHECK_KERNEL_DB_DIR ??= "${DL_DIR}/CVE_CHECK/vulns"
+
+# Use same intervals as cve-update-db-native. By default: once a day (24*60*60).
+# Use 0 to force the update
+# Use a negative value to skip the update
+
+CVE_DB_UPDATE_INTERVAL ??= "86400"
+
+python do_fetch(){
+    import os
+    import bb.utils
+
+    bb.utils.export_proxies(d)
+    db_file = d.getVar("CVE_CHECK_KERNEL_DB_DIR")
+    repo_url = d.getVar("VULNS_URL")
+
+    try:
+        import time
+        update_interval = int(d.getVar("CVE_DB_UPDATE_INTERVAL"))
+
+        if update_interval < 0:
+            bb.note("Kernel CVE database update skipped")
+            return
+        if time.time() - os.path.getmtime(db_file) < update_interval:
+            bb.debug(2,"Kernel CVE database, recently updated, skipping")
+            return
+
+    except OSError:
+        pass
+
+    bb.utils.mkdirhier(os.path.dirname(db_file))
+    # Configure cmd
+    if not os.path.exists(db_file):
+        cmd = f"git clone {repo_url} {db_file}"
+    else:
+        cmd = f"git -C {db_file} pull"
+    try:
+        bb.fetch2.runfetchcmd(cmd, d)
+    except bb.fetch2.FetchError as e:
+        bb.warn(f"Kernel vulns repo url not accessible. {repo_url}")
+        bb.warn("Set VULNS_URL in local.conf to point to a local copy or mirror")
+}
+
+do_clean() {
+    rm -rf ${CVE_CHECK_KERNEL_DB_DIR}
+}
+
+deltask do_patch
+deltask do_unpack
+deltask do_configure
+deltask do_compile
+deltask do_install
+deltask do_populate_sysroot
+deltask do_runtime_spdx
+deltask do_create_spdx
+deltask do_populate_lic
+deltask do_cve_check
+
+do_fetch[nostamp] = "1"
+do_fetch[file-checksums] = ""
+do_fetch[vardeps] = ""
+
+EXCLUDE_FROM_WORLD = "1"