1 files changed, 82 insertions, 0 deletions

diff --git a/meta/lib/oe/cve_check.py b/meta/lib/oe/cve_check.py
index b17390de90..a4b831831b 100644
--- a/meta/lib/oe/cve_check.py
+++ b/meta/lib/oe/cve_check.py
@@ -89,3 +89,85 @@ def update_symlinks(target_path, link_path):
         if os.path.exists(os.path.realpath(link_path)):
             os.remove(link_path)
         os.symlink(os.path.basename(target_path), link_path)
+
+def get_patched_cves(d):
+    """
+    Get patches that solve CVEs using the "CVE: " tag.
+    """
+
+    import re
+    import oe.patch
+
+    pn = d.getVar("PN")
+    cve_match = re.compile("CVE:( CVE\-\d{4}\-\d+)+")
+
+    # Matches the last "CVE-YYYY-ID" in the file name, also if written
+    # in lowercase. Possible to have multiple CVE IDs in a single
+    # file name, but only the last one will be detected from the file name.
+    # However, patch files contents addressing multiple CVE IDs are supported
+    # (cve_match regular expression)
+
+    cve_file_name_match = re.compile(".*([Cc][Vv][Ee]\-\d{4}\-\d+)")
+
+    patched_cves = set()
+    bb.debug(2, "Looking for patches that solves CVEs for %s" % pn)
+    for url in oe.patch.src_patches(d):
+        patch_file = bb.fetch.decodeurl(url)[2]
+
+        if not os.path.isfile(patch_file):
+            bb.error("File Not found: %s" % patch_file)
+            raise FileNotFoundError
+
+        # Check patch file name for CVE ID
+        fname_match = cve_file_name_match.search(patch_file)
+        if fname_match:
+            cve = fname_match.group(1).upper()
+            patched_cves.add(cve)
+            bb.debug(2, "Found CVE %s from patch file name %s" % (cve, patch_file))
+
+        with open(patch_file, "r", encoding="utf-8") as f:
+            try:
+                patch_text = f.read()
+            except UnicodeDecodeError:
+                bb.debug(1, "Failed to read patch %s using UTF-8 encoding"
+                        " trying with iso8859-1" %  patch_file)
+                f.close()
+                with open(patch_file, "r", encoding="iso8859-1") as f:
+                    patch_text = f.read()
+
+        # Search for one or more "CVE: " lines
+        text_match = False
+        for match in cve_match.finditer(patch_text):
+            # Get only the CVEs without the "CVE: " tag
+            cves = patch_text[match.start()+5:match.end()]
+            for cve in cves.split():
+                bb.debug(2, "Patch %s solves %s" % (patch_file, cve))
+                patched_cves.add(cve)
+                text_match = True
+
+        if not fname_match and not text_match:
+            bb.debug(2, "Patch %s doesn't solve CVEs" % patch_file)
+
+    return patched_cves
+
+
+def get_cpe_ids(cve_product, version):
+    """
+    Get list of CPE identifiers for the given product and version
+    """
+
+    version = version.split("+git")[0]
+
+    cpe_ids = []
+    for product in cve_product.split():
+        # CVE_PRODUCT in recipes may include vendor information for CPE identifiers. If not,
+        # use wildcard for vendor.
+        if ":" in product:
+            vendor, product = product.split(":", 1)
+        else:
+            vendor = "*"
+
+        cpe_id = f'cpe:2.3:a:{vendor}:{product}:{version}:*:*:*:*:*:*:*'
+        cpe_ids.append(cpe_id)
+
+    return cpe_ids