Modifying the kernel_utility tool to create our magic blob.

src/platform/vboot_reference/tests/gen_fuzz_test_cases.sh

 #!/bin/bash
 
 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Generate test cases for use for the RSA verify benchmark.
 
 # Load common constants and variables.
 . "$(dirname "$0")/common.sh"
@@ skipping 15 matching lines @@
     --firmware_sign_key_pub ${TESTKEY_DIR}/key_rsa4096.keyb \
     --firmware_sign_algorithm 8 \
     --firmware_key_version 1 \
     --firmware_version 1 \
     --out ${TESTCASE_DIR}/firmware.signed
   cp ${TESTKEY_DIR}/key_rsa8192.keyb ${TESTCASE_DIR}/root_key.keyb
 
   echo "Generating signed kernel test image..."
   # Generate a test verified boot kernel image and copy firmware public key.
   ${UTIL_DIR}/kernel_utility --generate \
-    --in $1 \
     --firmware_key ${TESTKEY_DIR}/key_rsa4096.pem \
     --kernel_key ${TESTKEY_DIR}/key_rsa1024.pem \
     --kernel_key_pub ${TESTKEY_DIR}/key_rsa1024.keyb \
     --firmware_sign_algorithm 8 \
     --kernel_sign_algorithm 2 \
     --kernel_key_version 1 \
     --kernel_version 1 \
+    --vmlinuz /dev/null \
+    --config /dev/null \
+    --bootloader ${TEST_FILE} \
     --out ${TESTCASE_DIR}/kernel.signed 
   cp ${TESTKEY_DIR}/key_rsa4096.keyb ${TESTCASE_DIR}/firmware_key.keyb
 }
 
 function pre_work {
   # Generate a file to serve as random bytes for firmware/kernel contents.
+  # NOTE: The kernel and config file can't really be random, but the bootloader
+  # can. That's probably close enough.
   echo "Generating test file..."
   dd if=/dev/urandom of=${TEST_FILE} bs=${TEST_FILE_SIZE} count=1
 }
 mkdir -p ${TESTCASE_DIR}
 pre_work
 check_test_keys
 generate_fuzzing_images ${TEST_FILE}