gnutls: patch CVE-2025-32989

Pick relevant commit from 3.8.10 release MR [1].

Binary test file was added as separate file as binary diffs are not
supported.

[1] https://gitlab.com/gnutls/gnutls/-/merge_requests/1979

(From OE-Core rev: fbe5f828c63071962d571a8787298aa5fd78ebe8)

Signed-off-by: Peter Marko <peter.marko@siemens.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

meta/recipes-support/gnutls/gnutls/CVE-2025-32989.patch

@@ -0,0 +1,50 @@
+From 8e5ca951257202089246fa37e93a99d210ee5ca2 Mon Sep 17 00:00:00 2001
+From: Andrew Hamilton <adhamilt@gmail.com>
+Date: Mon, 7 Jul 2025 10:23:59 +0900
+Subject: [PATCH] x509: fix read buffer overrun in SCT timestamps
+
+Prevent reading beyond heap buffer in call to _gnutls_parse_ct_sct
+when processing x509 Signed Certificate Timestamps with certain
+malformed data. Spotted by oss-fuzz at:
+https://issues.oss-fuzz.com/issues/42530513
+
+Signed-off-by: Andrew Hamilton <adhamilt@gmail.com>
+Signed-off-by: Daiki Ueno <ueno@gnu.org>
+
+CVE: CVE-2025-32989
+Upstream-Status: Backport [https://gitlab.com/gnutls/gnutls/-/commit/8e5ca951257202089246fa37e93a99d210ee5ca2]
+Signed-off-by: Peter Marko <peter.marko@siemens.com>
+---
+ NEWS                                             |   5 +++++
+ lib/x509/x509_ext.c                              |   2 +-
+ 2 files changed, 6 insertions(+), 1 deletion(-)
+
+diff --git a/NEWS b/NEWS
+index 85efb5680..025e05148 100644
+--- a/NEWS
++++ b/NEWS
+@@ -5,6 +5,11 @@ Copyright (C) 2000-2016 Free Software Foundation, Inc.
+ Copyright (C) 2013-2019 Nikos Mavrogiannopoulos
+ See the end for copying conditions.
+ 
++** libgnutls: Fix heap read buffer overrun in parsing X.509 SCTS timestamps
++   Spotted by oss-fuzz and reported by OpenAI Security Research Team,
++   and fix developed by Andrew Hamilton. [GNUTLS-SA-2025-07-07-1,
++   CVSS: medium] [CVE-2025-32989]
++
+ * Version 3.7.4 (released 2022-03-17)
+ 
+ ** libgnutls: Fixed double free during verification of pkcs7 signatures.
+diff --git a/lib/x509/x509_ext.c b/lib/x509/x509_ext.c
+index 064ca8357..05336a0c2 100644
+--- a/lib/x509/x509_ext.c
++++ b/lib/x509/x509_ext.c
+@@ -3855,7 +3855,7 @@ int gnutls_x509_ext_ct_import_scts(const gnutls_datum_t *ext, gnutls_x509_ct_sct
+ 	}
+ 
+ 	length = _gnutls_read_uint16(scts_content.data);
+-	if (length < 4) {
++	if (length < 4 || length > scts_content.size) {
+ 		gnutls_free(scts_content.data);
+ 		return GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE;
+ 	}

meta/recipes-support/gnutls/gnutls_3.7.4.bb

@@ -29,6 +29,8 @@ SRC_URI = "https://www.gnupg.org/ftp/gcrypt/gnutls/v${SHRT_VER}/gnutls-${PV}.tar
            file://CVE-2024-28834.patch \
            file://CVE-2024-28835.patch \
            file://CVE-2024-12243.patch \
+           file://CVE-2025-32989.patch \
+           file://04939b75417cc95b7372c6f208c4bda4579bdc34 \
            "
 
 SRC_URI[sha256sum] = "e6adbebcfbc95867de01060d93c789938cf89cc1d1f6ef9ef661890f6217451f"
@@ -65,6 +67,10 @@ do_configure:prepend() {
 	for dir in . lib; do
 		rm -f ${dir}/aclocal.m4 ${dir}/m4/libtool.m4 ${dir}/m4/lt*.m4
 	done
+
+    # binary files cannot be delivered as diff
+    mkdir -p ${S}/fuzz/gnutls_x509_parser_fuzzer.repro/
+    cp ${WORKDIR}/04939b75417cc95b7372c6f208c4bda4579bdc34 ${S}/fuzz/gnutls_x509_parser_fuzzer.repro/
 }
 
 PACKAGES =+ "${PN}-openssl ${PN}-xx"