[Low] Patch libxml2 for CVE-2025-6170

[BinduSri-6522866]

Merge Checklist

All boxes should be checked before merging the PR (just tick any boxes which don't apply to this PR)

• The toolchain has been rebuilt successfully (or no changes were made to it)
• The toolchain/worker package manifests are up-to-date
• Any updated packages successfully build (or no packages were changed)
• Packages depending on static components modified in this PR (Golang, *-static subpackages, etc.) have had their Release tag incremented.
• Package tests (%check section) have been verified with RUN_CHECK=y for existing SPEC files, or added to new SPEC files
• All package sources are available
• cgmanifest files are up-to-date and sorted (./cgmanifest.json, ./toolkit/scripts/toolchain/cgmanifest.json, .github/workflows/cgmanifest.json)
• LICENSE-MAP files are up-to-date (./LICENSES-AND-NOTICES/SPECS/data/licenses.json, ./LICENSES-AND-NOTICES/SPECS/LICENSES-MAP.md, ./LICENSES-AND-NOTICES/SPECS/LICENSE-EXCEPTIONS.PHOTON)
• All source files have up-to-date hashes in the *.signatures.json files
• sudo make go-tidy-all and sudo make go-test-coverage pass
• Documentation has been updated to match any changes to the build system
• Ready to merge

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Summary

Patch libxml2 for CVE-2025-6170
Patch modified: Yes

• result/scripts/long_command, test/scripts/long_command.script and test/scripts/long_command.xml files are not - present in source tar ball. So, patch is not applied for these files.
• Affected code present in existing libxml2 version ( debugXML.c ) '2.10.4' and available patch version '2.14.x' ( shell.c ) file and function names are different. Hence, modified affected code in xmlShell ( xmllintShell in upstream patch) function.
• Astrolabe patch reference link: https://gitlab.gnome.org/GNOME/libxml2/-/issues/941 navigates to https://gitlab.gnome.org/GNOME/libxml2/-/merge_requests/321/diffs

Change Log

• new file: SPECS/libxml2/CVE-2025-6170.patch
• modified: SPECS/libxml2/libxml2.spec
• modified: toolkit/resources/manifests/package/pkggen_core_aarch64.txt
• modified: toolkit/resources/manifests/package/pkggen_core_x86_64.txt
• modified: toolkit/resources/manifests/package/toolchain_aarch64.txt
• modified: toolkit/resources/manifests/package/toolchain_x86_64.txt

Does this affect the toolchain?

YES

Links to CVEs

• https://nvd.nist.gov/vuln/detail/CVE-2025-6170

Test Methodology

• Local build

• Patch applies cleanly
  

• Build is successful -
  libxml2-2.10.4-8.cm2.src.rpm.log

• Test is successful -
  libxml2-2.10.4-8.cm2.src.rpm.test.log