This update for shim fixes the following issues:

shim is updated to version 16.1:

- shim_start_image(): fix guid/handle pairing when uninstalling protocols
- Fix uncompressed ipv6 netboot
- fix test segfaults caused by uninitialized memory
- SbatLevel_Variable.txt: minor typo fix.
- Realloc() needs to allocate one more byte for sprintf()
- IPv6: Add more check to avoid multiple double colon and illegal char
- Loader proto v2
- loader-protocol: add workaround for EDK2 2025.02 page fault on FreePages
- Generate Authenticode for the entire PE file
- README: mention new loader protocol and interaction with UKIs
- shim: change automatically enable MOK_POLICY_REQUIRE_NX
- Save var info
- add SbatLevel entry 2025051000 for PSA-2025-00012-1
- Coverity fixes 20250804
- fix http boot
- Fix double free and leak in the loader protocol


shim is updated to version 16.0:


- Validate that a supplied vendor cert is not in PEM format
- sbat: Add grub.peimage,2 to latest (CVE-2024-2312)
- sbat: Also bump latest for grub,4 (and to todays date)
- undo change that limits certificate files to a single file
- shim: don't set second_stage to the empty string
- Fix SBAT.md for today's consensus about numbers
- Update Code of Conduct contact address
- make-certs: Handle missing OpenSSL installation
- Update MokVars.txt
- export DEFINES for sub makefile
- Drop unused EFI_IMAGE_SECURITY_DATABASE_GUID definition
- Null-terminate 'arguments' in fallback
- Fix 'Verifiying' typo in error message
- Update Fedora CI targets
- Force gcc to produce DWARF4 so that gdb can use it
- Minor housekeeping 2024121700
- Discard load-options that start with WINDOWS
- Fix the issue that the gBS->LoadImage pointer was empty.
- shim: Allow data after the end of device path node in load options
- Handle network file not found like disks
- Update gnu-efi submodule for EFI_HTTP_ERROR
- Increase EFI file alignment
- avoid EFIv2 runtime services on Apple x86 machines
- Improve shortcut performance when comparing two boolean expressions
- Provide better error message when MokManager is not found
- tpm: Boot with a warning if the event log is full
- MokManager: remove redundant logical constraints
- Test import_mok_state() when MokListRT would be bigger than available size
- test-mok-mirror: minor bug fix
- Fix file system browser hang when enrolling MOK from disk
- Ignore a minor clang-tidy nit
- Allow fallback to default loader when encountering errors on network boot
- test.mk: don't use a temporary random.bin
- pe: Enhance debug report for update_mem_attrs
- Multiple certificate handling improvements
- Generate SbatLevel Metadata from SbatLevel_Variable.txt
- Apply EKU check with compile option
- Add configuration option to boot an alternative 2nd stage
- Loader protocol (with Device Path resolution support)
- netboot cleanup for additional files
- Document how revocations can be delivered
- post-process-pe: add tests to validate NX compliance
- regression: CopyMem() in ad8692e copies out of bounds
- Save the debug and error logs in mok-variables
- Add features for the Host Security ID program
- Mirror some more efi variables to mok-variables
- This adds DXE Services measurements to HSI and uses them for NX
- Add shim's current NX_COMPAT status to HSIStatus
- README.tpm: reflect that vendor_db is in fact logged as 'vendor_db'
- Reject HTTP message with duplicate Content-Length header fields
- Disable log saving
- fallback: don't add new boot order entries backwards
- README.tpm: Update MokList entry to MokListRT
- SBAT Level update for February 2025 GRUB CVEs