[oe][meta-networking][scarthgap][PATCH] mbedtls: set CVE_STATUS for CVE-2025-66442

From: Deepak Rathore <[email protected]>

Analysis:
- The Mbed TLS advisory states the issue occurs when LLVM
  select-optimize is enabled. [1]
- The same advisory also states that Arm/x86 builds with
  MBEDTLS_HAVE_ASM enabled are not affected. The default mbedtls
  configuration in this branch enables MBEDTLS_HAVE_ASM.
- NVD also describes the issue as occurring only with LLVM's
  select-optimize feature. [2]
- The mbedtls recipes now evaluate the effective build flags across
  target, native, and nativesdk variants, handle the supported
  -mllvm spellings, and only mark the CVE unpatched when the
  vulnerable LLVM option combination is explicitly enabled and the
  Arm/x86 MBEDTLS_HAVE_ASM carve-out does not apply.
- When those conditions are not met, the current mbedtls build
  configuration is not affected.
- Hence ignoring/deferred the CVE for now.

Reference:
[1] https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-compiler-induced-constant-time-violations/
[2] https://nvd.nist.gov/vuln/detail/CVE-2025-66442

Signed-off-by: Deepak Rathore <[email protected]>
Signed-off-by: Khem Raj <[email protected]>
(cherry picked from commit 0eda0f3c556de7ab1c3b03b6f38eb9b4ac29a2d7)
Signed-off-by: Deepak Rathore <[email protected]>
---
 .../mbedtls/mbedtls_3.6.6.bb                    | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/meta-networking/recipes-connectivity/mbedtls/mbedtls_3.6.6.bb b/meta-networking/recipes-connectivity/mbedtls/mbedtls_3.6.6.bb
index cedbc90ccf..67f522f415 100644
--- a/meta-networking/recipes-connectivity/mbedtls/mbedtls_3.6.6.bb
+++ b/meta-networking/recipes-connectivity/mbedtls/mbedtls_3.6.6.bb
@@ -56,8 +56,25 @@ ALTERNATIVE_LINK_NAME[hello] = "${bindir}/hello"
 
 BBCLASSEXTEND = "native nativesdk"
 
+MBEDTLS_CVE_2025_66442_FLAGS = "${CFLAGS} ${CXXFLAGS} ${CPPFLAGS} ${TOOLCHAIN_OPTIONS}"
+MBEDTLS_CVE_2025_66442_FLAGS:append:class-native = " ${BUILD_CFLAGS} ${BUILD_CXXFLAGS} ${BUILD_CPPFLAGS}"
+MBEDTLS_CVE_2025_66442_FLAGS:append:class-nativesdk = " ${BUILDSDK_CFLAGS} ${BUILDSDK_CXXFLAGS} ${BUILDSDK_CPPFLAGS}"
+MBEDTLS_CVE_2025_66442_ARCH = "${TARGET_ARCH}"
+MBEDTLS_CVE_2025_66442_ARCH:class-native = "${BUILD_ARCH}"
+
 CVE_PRODUCT = "mbed_tls"
 
+CVE_STATUS[CVE-2025-66442] = "${@ \
+    'unpatched' if ( \
+        ((('-mllvm' in d.getVar('MBEDTLS_CVE_2025_66442_FLAGS').split() and \
+           ('--disable-select-optimize=false' in d.getVar('MBEDTLS_CVE_2025_66442_FLAGS').split() or \
+            '-disable-select-optimize=false' in d.getVar('MBEDTLS_CVE_2025_66442_FLAGS').split())) or \
+          '-mllvm=--disable-select-optimize=false' in d.getVar('MBEDTLS_CVE_2025_66442_FLAGS').split() or \
+          '-mllvm=-disable-select-optimize=false' in d.getVar('MBEDTLS_CVE_2025_66442_FLAGS').split()) and \
+         d.getVar('MBEDTLS_CVE_2025_66442_ARCH') not in ('aarch64', 'aarch64_be', 'arm', 'armeb', 'i586', 'i686', 'x86_64'))) \
+    else 'not-applicable-config: CVE applies only when LLVM select-optimize is enabled and the Arm/x86 MBEDTLS_HAVE_ASM carve-out does not apply; current mbedtls build configuration does not meet those conditions' \
+}"
+
 # Strip host paths from autogenerated test files
 do_compile:append() {
 	sed -i 's+${S}/++g' ${B}/tests/*.c 2>/dev/null || :
-- 
2.35.6