From patchwork Sat Feb 21 05:10:02 2026 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefano Tondo X-Patchwork-Id: 81563 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id DC814C61DBD for ; Sat, 21 Feb 2026 05:10:43 +0000 (UTC) Received: from mail-wr1-f52.google.com (mail-wr1-f52.google.com [209.85.221.52]) by mx.groups.io with SMTP id smtpd.msgproc02-g2.14948.1771650636388239017 for ; Fri, 20 Feb 2026 21:10:36 -0800 Authentication-Results: mx.groups.io; dkim=pass header.i=@gmail.com header.s=20230601 header.b=MINA67XD; spf=pass (domain: gmail.com, ip: 209.85.221.52, mailfrom: stondo@gmail.com) Received: by mail-wr1-f52.google.com with SMTP id ffacd0b85a97d-4359228b7c6so2091402f8f.2 for ; Fri, 20 Feb 2026 21:10:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1771650634; x=1772255434; darn=lists.openembedded.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=2GtFFnUFc4RlPHdJF36FYDPqXrJtSd99HmxT6JrOHwk=; b=MINA67XD42NeMwVEXx0G9+9fIaw2QFpQtJpxyOmgpT8XvEv6ABplnjcbOvbGFigDyV U/xiWp9XZScMIpXoFhHk1GCRPlrHJRNeDNvY8tg+Sfx19c6/3QRbFWG4+WwiM4OqLiex a69ZyViwfqT1NRJpUuP2cd7NpuJ37oV68W89JOB5LV77uLDMCfbxYx1/QzPfN4lNPd1x 21XBYO7P2idlJwsHoNGAxP+tiOj7sziL7Edu4krbNIx296TgFWdVDlK5lL62mruL6/tZ gcEqvBmp09MrZQAZEKeK+QkOv1ADrs1LVqDzJJbUTOa+cWWHRf02tiYs7BfnL2vM6IoG jHpw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1771650634; x=1772255434; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=2GtFFnUFc4RlPHdJF36FYDPqXrJtSd99HmxT6JrOHwk=; b=GR+fqXkEW20J4xRFPi8sId3+ryJCzI5sKFe6aOjXktNU8ci95k/uJho/ShpfpBUG8d vhRRxZsrrB9NjySMhv8n84Y3KVmziVQgRGjfu1721aQewh4zgdPaBmY5OSLtbXz0ZIlH xZbnMyNHWb0A0SsLkvCljj3A9PV/GW0Ad8YOu10EECORQ6CBQC3stztIxQrLc8ODv6EK XFV5c+C8yPI1aFOk5ZPRZM8k4ebWYl+Qe/azA95BgMrhXAUFe7OjmlmS+420Vq0VJGBe 6XOlw5xfPKaFdxoML2dSiIHwpgCtysbuVnTB0Niy2azc50lKMIRlkTYpCWbvW/pjxvwI LvzA== X-Gm-Message-State: AOJu0YzLsPIXuCcHgviYjcIE5e7YXOA0P9mT6w9GLZKiAFpngI0qzkXZ 2Nefz5Hpa30ynhXj/WDinAOY6rxlgvH2hqLmyI7cu2IV5mEpTDd/uPdPjtQdWQ== X-Gm-Gg: AZuq6aIRuDgjENZiCccsWqSxROFOA2nEcJJC+49KRIqwbPO5yVHARDF7ZiGS2ISt0Jw dCR0JDVrXtUZ/tlaLEa5vfzIudC0MLWONCPedsfueb5cI3HETlhysWB7r2MVKS3in4Jj11Mfyle qSy+dWf/xYliLrwRMSfdNxdBEoEvxcX9NvAN4zmcMojjdRLfk4zRkQCJs11B50TZFpoEWnhGTkP RL8i3Z5qhxuYNoJkO+RBRWYDQRUi+gNQHOsn9Sg1oa5h8airRfHYAYLVf7XsuHXY6l7oXlJEjFK F4lwtZFB7qvly5t+pPmbKRReWGg3IAjyWieJpe2uEv5OpEkbBa2KqQjwyNOF9sl8bAdcwqz6Eqc CvDdArvVSfs1AE+w0bc0NU4SP9A4oL3D+Ul1lHg0qTa7/kQHV4g8JiDGxCA9+cYUmU12Nv6EaAA Z/y4Mx84sXpAmzvBiXsMMVOPYxodRy+zPp2OjsqytdFWKS2A== X-Received: by 2002:a05:6000:1845:b0:437:6bcd:77f9 with SMTP id ffacd0b85a97d-4396f185382mr3488775f8f.40.1771650634417; Fri, 20 Feb 2026 21:10:34 -0800 (PST) Received: from fedora ([81.6.40.67]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-43970bfa1bdsm2455901f8f.3.2026.02.20.21.10.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 20 Feb 2026 21:10:33 -0800 (PST) From: Stefano Tondo To: openembedded-core@lists.openembedded.org Cc: stefano.tondo.ext@siemens.com, adrian.freihofer@siemens.com, Peter.Marko@siemens.com, jpewhacker@gmail.com, Ross.Burton@arm.com Subject: [PATCH v2 14/18] cve_check: Escape special characters in CPE 2.3 formatted strings Date: Sat, 21 Feb 2026 06:10:02 +0100 Message-ID: <20260221051006.335141-15-stondo@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260221051006.335141-1-stondo@gmail.com> References: <20260221051006.335141-1-stondo@gmail.com> MIME-Version: 1.0 List-Id: X-Webhook-Received: from 45-33-107-173.ip.linodeusercontent.com [45.33.107.173] by aws-us-west-2-korg-lkml-1.web.codeaurora.org with HTTPS for ; Sat, 21 Feb 2026 05:10:43 -0000 X-Groupsio-URL: https://lists.openembedded.org/g/openembedded-core/message/231594 From: Stefano Tondo CPE 2.3 formatted string binding (cpe:2.3:...) requires backslash escaping for special meta-characters according to NISTIR 7695. Characters like '++' and ':' in product names must be properly escaped to pass SBOM validation. The CPE 2.3 specification defines two bindings: - URI binding (cpe:/...) uses percent-encoding - Formatted string binding (cpe:2.3:...) uses backslash escaping This patch implements the formatted string binding properly by escaping only the required meta-characters with backslash: - Backslash (\) -> \\ - Question mark (?) -> \? - Asterisk (*) -> \* - Colon (:) -> \: - Plus (+) -> \+ (required by some SBOM validators) All other characters including -, etc. are kept as-is without encoding. Example CPE identifiers: - cpe:2.3:*:*:crow:1.0+x:*:*:*:*:*:*:* - cpe:2.3:*:*:sdbus-c++:2.2.1:*:*:*:*:*:*:* Signed-off-by: Stefano Tondo --- meta/lib/oe/cve_check.py | 37 ++++++++++++++++++++++++++++++++++++- 1 file changed, 36 insertions(+), 1 deletion(-) diff --git a/meta/lib/oe/cve_check.py b/meta/lib/oe/cve_check.py index ae194f27cf..fa210e2037 100644 --- a/meta/lib/oe/cve_check.py +++ b/meta/lib/oe/cve_check.py @@ -205,6 +205,34 @@ def get_patched_cves(d): return patched_cves +def cpe_escape(value): + r""" + Escape special characters for CPE 2.3 formatted string binding. + + CPE 2.3 formatted string binding (cpe:2.3:...) uses backslash escaping + for special meta-characters, NOT percent-encoding. Percent-encoding is + only used in the URI binding (cpe:/...). + + According to NISTIR 7695, these characters need escaping: + - Backslash (\) -> \\ + - Question mark (?) -> \? + - Asterisk (*) -> \* + - Colon (:) -> \: + - Plus (+) -> \+ (required by some SBOM validators) + """ + if not value: + return value + + # Escape special meta-characters for CPE 2.3 formatted string binding + # Order matters: escape backslash first to avoid double-escaping + result = value.replace('\\', '\\\\') + result = result.replace('?', '\\?') + result = result.replace('*', '\\*') + result = result.replace(':', '\\:') + result = result.replace('+', '\\+') + + return result + def get_cpe_ids(cve_product, version): """ Get list of CPE identifiers for the given product and version @@ -221,7 +249,14 @@ def get_cpe_ids(cve_product, version): else: vendor = "*" - cpe_id = 'cpe:2.3:*:{}:{}:{}:*:*:*:*:*:*:*'.format(vendor, product, version) + # Encode special characters per CPE 2.3 specification + encoded_vendor = cpe_escape(vendor) if vendor != "*" else vendor + encoded_product = cpe_escape(product) + encoded_version = cpe_escape(version) + + cpe_id = 'cpe:2.3:*:{}:{}:{}:*:*:*:*:*:*:*'.format( + encoded_vendor, encoded_product, encoded_version + ) cpe_ids.append(cpe_id) return cpe_ids