Fuzz introspector
For issues and ideas: https://github.com/ossf/fuzz-introspector/issues

Fuzzer details

Fuzzer: fuzz_fileio

Call tree

The calltree shows the control flow of the fuzzer. This is overlaid with coverage information to display how much of the potential code a fuzzer can reach is in fact covered at runtime. In the following there is a link to a detailed calltree visualisation as well as a bitmap showing a high-level view of the calltree. For further information about these topics please see the glossary for full calltree and calltree overview

Call tree overview bitmap:

The distribution of callsites in terms of coloring is
Color Runtime hitcount Callsite count Percentage
red 0 33 58.9%
gold [1:9] 0 0.0%
yellow [10:29] 0 0.0%
greenyellow [30:49] 0 0.0%
lawngreen 50+ 23 41.0%
All colors 56 100

Fuzz blockers

The following nodes represent call sites where fuzz blockers occur.

Amount of callsites blocked Calltree index Parent function Callsite Largest blocked function
30 22 google.cloud.storage.fileio.BlobReader.seek call site: 00022 google.cloud.storage._helpers._PropertyMixin.reload
3 14 google.cloud.storage.fileio.BlobReader.read call site: 00014 google.cloud.storage._helpers._PropertyMixin._require_client

Runtime coverage analysis

Covered functions
342
Functions that are reachable but not covered
27
Reachable functions
33
Percentage of reachable functions covered
18.18%
NB: The sum of covered functions and functions that are reachable but not covered need not be equal to Reachable functions . This is because the reachability analysis is an approximation and thus at runtime some functions may be covered that are not included in the reachability analysis. This is a limitation of our static analysis capabilities.
Warning: The number of covered functions are larger than the number of reachable functions. This means that there are more functions covered at runtime than are extracted using static analysis. This is likely a result of the static analysis component failing to extract the right call graph or the coverage runtime being compiled with sanitizers in code that the static analysis has not analysed. This can happen if lto/gold is not used in all places that coverage instrumentation is used.
Function name source code lines source lines hit percentage hit

Files reached

filename functions hit
/ 1
...fuzz_fileio 7
google.cloud.storage.fileio 8
google.cloud.storage.blob 8
google.cloud.storage.bucket 1
google.cloud.storage._helpers 10
google.cloud._helpers 3

Analyses and suggestions

Optimal target analysis

Remaining optimal interesting functions

The following table shows a list of functions that are optimal targets. Optimal targets are identified by finding the functions that in combination, yield a high code coverage.

Func name Functions filename Arg count Args Function depth hitcount instr count bb count cyclomatic complexity Reachable functions Incoming references total cyclomatic complexity Unreached complexity
google.protobuf.text_format._Parser._MergeField google.protobuf.text_format 3 ['N/A', 'N/A', 'N/A'] 6 0 18 23 12 215 9 723 711
google.oauth2._id_token_async.fetch_id_token google.oauth2._id_token_async 2 ['N/A', 'N/A'] 12 0 4 4 5 202 0 649 616
google.cloud.storage.blob.Blob.upload_from_file google.cloud.storage.blob 15 ['N/A', 'N/A', 'N/A', 'N/A', 'N/A', 'N/A', 'N/A', 'N/A', 'N/A', 'N/A', 'N/A', 'N/A', 'N/A', 'N/A', 'N/A'] 4 0 5 2 4 163 2 529 456
google.api_core.operations_v1.transports.rest.OperationsRestTransport._list_operations google.api_core.operations_v1.transports.rest 5 ['N/A', 'N/A', 'N/A', 'N/A', 'N/A'] 5 0 3 2 4 93 0 326 263
google.auth._default._get_explicit_environ_credentials google.auth._default 1 ['N/A'] 4 0 3 2 4 99 1 314 195
mock.mock._patch.__enter__ mock.mock 1 ['N/A'] 2 0 5 38 18 60 1 222 192
google.protobuf.text_format._Printer.PrintFieldValue google.protobuf.text_format 3 ['N/A', 'N/A', 'N/A'] 6 0 14 12 8 194 14 653 145

Implementing fuzzers that target the above functions will improve reachability such that it becomes:

Functions statically reachable by fuzzers
18.0%
438 / 2473
Cyclomatic complexity statically reachable by fuzzers
19.0%
1575 / 8196

All functions overview

If you implement fuzzers for these functions, the status of all functions in the project will be:

Func name Functions filename Args Function call depth Reached by Fuzzers Fuzzers runtime hit Func lines hit % I Count BB Count Cyclomatic complexity Functions reached Reached by functions Accumulated cyclomatic complexity Undiscovered complexity

Runtime coverage analysis

This section shows analysis of runtime coverage data.

For futher technical details on how this section is generated, please see the Glossary .

Complex functions with low coverage

Func name Function total lines Lines covered at runtime percentage covered Reached by fuzzers
mock.mock._patch.__enter__ 101 0 0.0% []
mock.mock._Call.__eq__ 38 1 2.631% []
mock.mock.create_autospec 69 0 0.0% []
google.cloud.storage.blob.Blob._do_multipart_upload 34 0 0.0% []
google.cloud.storage.blob.Blob._initiate_resumable_upload 34 0 0.0% []
google.cloud.storage.blob.Blob.compose 31 0 0.0% []
google.cloud.storage._signing.generate_signed_url_v4 57 0 0.0% []
response.content 429 86 20.04% []
e.with_traceback 37 13 35.13% []
connection.close 231 70 30.30% []
google.protobuf.descriptor_pool.DescriptorPool._ConvertFileProtoToFileDescriptor 37 0 0.0% []
google.protobuf.descriptor_pool.DescriptorPool._ConvertMessageDescriptor 31 0 0.0% []
google.protobuf.descriptor_pool.DescriptorPool._SetFieldType 47 0 0.0% []
google.protobuf.internal.api_implementation._CanImport 43 21 48.83% []
name.rstrip 72 12 16.66% []
collections.OrderedDict.values 185 52 28.10% []
google.protobuf.descriptor.MakeDescriptor 44 0 0.0% []
fields.items 91 21 23.07% []
google.protobuf.internal.well_known_types.Timestamp.FromJsonString 38 0 0.0% []
pkg_resources.get_distribution 1578 24 1.520% []
val.split 90 49 54.44% []
six.moves.http_client.HTTPConnection 521 281 53.93% []
cachetools.LRUCache 592 132 22.29% []
pyasn1_modules.pem.readPemBlocksFromFile 39 7 17.94% []
url.find 206 54 26.21% []
d.get 189 25 13.22% []
api.Authenticate 195 14 7.179% []
transport.request 140 34 24.28% []
google.cloud.storage.client.Client.__init__ 34 0 0.0% []
google.cloud.storage.client.Client.create_bucket 32 0 0.0% []
decoder.decompress 993 152 15.30% []
request.pop 40 12 30.0% []
urllib3.util.ssl_.create_urllib3_context 192 46 23.95% []

Files and Directories in report

This section shows which files and directories are considered in this report. The main reason for showing this is fuzz introspector may include more code in the reasoning than is desired. This section helps identify if too many files/directories are included, e.g. third party code, which may be irrelevant for the threat model. In the event too much is included, fuzz introspector supports a configuration file that can exclude data from the report. See the following link for more information on how to create a config file: link

Files in report

Source file Reached by Covered by
[] []
google.api_core.bidi [] []
google.api_core.general_helpers [] []
google.cloud.operation [] []
inspect [] []
google.resumable_media [] []
google.auth.transport.grpc [] []
google.auth.jwt [] []
platform [] []
google.auth [] []
google.auth.crypt._cryptography_rsa [] []
operator [] []
google.api.system_parameter_pb2 [] []
google.oauth2._reauth_async [] []
typing [] []
google.api_core [] []
google.protobuf.text_format [] []
google.oauth2.challenges [] []
google.logging.type.log_severity_pb2 [] []
google.rpc.status_pb2 [] []
google.cloud.storage._helpers ['fuzz_fileio'] []
google.oauth2.utils [] []
google.api.visibility_pb2 [] []
google.cloud.storage.iam [] []
google.cloud.environment_vars [] []
google.oauth2.sts [] []
google.cloud.storage.fileio ['fuzz_fileio'] []
google.type.quaternion_pb2 [] []
os [] []
google._async_resumable_media._upload [] []
posixpath [] []
google.protobuf.unknown_fields [] []
google.rpc.http_pb2 [] []
google.api.billing_pb2 [] []
getpass [] []
google.protobuf.internal.testing_refleaks [] []
google.api.annotations_pb2 [] []
google.auth.environment_vars [] []
google.api_core.operations_v1.abstract_operations_client [] []
google.oauth2 [] []
google._async_resumable_media.requests.upload [] []
google.cloud.location.locations_pb2 [] []
google.api.backend_pb2 [] []
google.auth.exceptions [] []
mock.mock [] []
time [] []
struct [] []
google.auth.metrics [] []
subprocess [] []
google.api_core.rest_streaming [] []
google.protobuf.descriptor_pb2 [] []
google.api_core.protobuf_helpers [] []
google.auth.api_key [] []
google.api.metric_pb2 [] []
google.api_core.iam [] []
google.type.datetime_pb2 [] []
collections [] []
distutils [] []
google.resumable_media._upload [] []
google.auth.crypt.base [] []
google.api.context_pb2 [] []
google.protobuf.internal.message_listener [] []
google.auth.transport.requests [] []
google.auth.external_account_authorized_user [] []
google.api_core.client_options [] []
google.api.auth_pb2 [] []
google.auth._oauth2client [] []
OpenSSL [] []
google.type.postal_address_pb2 [] []
mock [] []
google.resumable_media.requests.upload [] []
google.protobuf.text_encoding [] []
crcmod [] []
importlib [] []
google.auth.external_account [] []
google.auth._default_async [] []
google.protobuf.any_pb2 [] []
google.api_core.page_iterator [] []
google.api.monitored_resource_pb2 [] []
google.protobuf.symbol_database [] []
google.auth.aws [] []
binascii [] []
google.api_core.operation [] []
google._upb._message [] []
logging [] []
mock.backports [] []
google.protobuf.json_format [] []
cffi [] []
google.type.latlng_pb2 [] []
google.resumable_media.requests [] []
grpc [] []
pkgutil [] []
google.cloud.storage.transfer_manager [] []
google_crc32c [] []
google.protobuf.service_reflection [] []
sys [] []
google.api.monitoring_pb2 [] []
rsa [] []
google.api.control_pb2 [] []
json [] []
google.api_core.grpc_helpers_async [] []
google.rpc [] []
pyasn1 [] []
google.api_core.operations_v1.transports.base [] []
google.api.usage_pb2 [] []
google.cloud._helpers ['fuzz_fileio'] []
google.auth.credentials [] []
google.auth.crypt._python_rsa [] []
google.type.localized_text_pb2 [] []
google.oauth2.service_account [] []
google.gapic.metadata [] []
google.api.consumer_pb2 [] []
six [] []
google.type.expr_pb2 [] []
google.auth.crypt.rsa [] []
google.logging.type [] []
...fuzz_fileio ['fuzz_fileio'] []
google.protobuf.internal.encoder [] []
hmac [] []
google.api.field_behavior_pb2 [] []
google.api_core.gapic_v1.method [] []
google.api.source_info_pb2 [] []
google.rpc.code_pb2 [] []
google.api_core.gapic_v1 [] []
google.cloud.storage._signing [] []
google.resumable_media.requests._request_helpers [] []
google.auth.transport [] []
google.protobuf.service [] []
asyncio [] []
google.protobuf.api_pb2 [] []
google.auth.transport.urllib3 [] []
google.protobuf.message_factory [] []
contextlib [] []
google.protobuf.descriptor [] []
google.auth.transport._aiohttp_requests [] []
google.protobuf.type_pb2 [] []
google.api_core.gapic_v1.routing_header [] []
google.api.client_pb2 [] []
google.protobuf.internal.api_implementation [] []
google.protobuf.descriptor_database [] []
google.cloud.storage.blob ['fuzz_fileio'] []
google.auth.crypt.es256 [] []
google.type.money_pb2 [] []
google.api_core.retry [] []
google.cloud.version [] []
google.protobuf.timestamp_pb2 [] []
grpc_status [] []
random [] []
google.protobuf.internal.builder [] []
google.api.error_reason_pb2 [] []
google.protobuf.descriptor_pool [] []
google.auth.compute_engine._metadata [] []
google.api_core.rest_helpers [] []
google.auth._default [] []
weakref [] []
google.auth.downscoped [] []
google.auth.transport._http_client [] []
google.resumable_media._helpers [] []
google.resumable_media.requests.download [] []
google.logging.type.http_request_pb2 [] []
cachetools [] []
google.protobuf.message [] []
google._async_resumable_media._download [] []
google.api.distribution_pb2 [] []
google.oauth2._credentials_async [] []
google.protobuf.proto_builder [] []
pyasn1_modules [] []
google.api_core.gapic_v1.client_info [] []
google.api_core.future._helpers [] []
google.auth._service_account_info [] []
google.cloud.obsolete [] []
google.protobuf.internal [] []
google.oauth2._client [] []
google.api_core.gapic_v1.method_async [] []
google.protobuf.internal.enum_type_wrapper [] []
google.api_core.page_iterator_async [] []
google.api.service_pb2 [] []
google.api_core.operations_v1.operations_async_client [] []
gc [] []
google.protobuf.compiler.plugin_pb2 [] []
base64 [] []
pickle [] []
google.protobuf.pyext.cpp_message [] []
google._async_resumable_media.requests.download [] []
google.protobuf.internal.type_checkers [] []
google.rpc.context.audit_context_pb2 [] []
google.api_core.future [] []
google.auth._jwt_async [] []
google.rpc.context [] []
google.protobuf.internal.containers [] []
google.protobuf.internal.extension_dict [] []
google.api_core.exceptions [] []
google.protobuf.internal.wire_format [] []
google._async_resumable_media.requests._request_helpers [] []
google.type.dayofweek_pb2 [] []
google.api_core.retry_async [] []
tempfile [] []
google.auth._cloud_sdk [] []
unittest [] []
google.oauth2._client_async [] []
google.protobuf.internal.python_message [] []
google.auth.identity_pool [] []
google.type.phone_number_pb2 [] []
google.api_core.timeout [] []
google.cloud.storage.acl [] []
hashlib [] []
google.cloud.storage.client [] []
google.oauth2._id_token_async [] []
google.type.timeofday_pb2 [] []
requests [] []
google.api_core.version [] []
google.longrunning [] []
google.rpc.context.attribute_context_pb2 [] []
google.type.color_pb2 [] []
google.api_core.future.async_future [] []
grpc_gcp [] []
google.api_core.gapic_v1.config [] []
google.cloud.client [] []
google.api.config_change_pb2 [] []
google.auth.transport.mtls [] []
math [] []
google.protobuf.compiler [] []
google.type [] []
pkg_resources [] []
google.api_core.operations_v1.operations_client [] []
google.api_core.datetime_helpers [] []
google.type.interval_pb2 [] []
certifi [] []
google.api.endpoint_pb2 [] []
google.protobuf.empty_pb2 [] []
google.protobuf.internal.well_known_types [] []
google.cloud.storage.notification [] []
google.protobuf.source_context_pb2 [] []
[] []
google.longrunning.operations_proto_pb2 [] []
google.cloud.storage._http [] []
google.gapic.metadata.gapic_metadata_pb2 [] []
google.oauth2._service_account_async [] []
google.api_core.grpc_helpers [] []
io [] []
google.auth.version [] []
google.api_core.operations_v1 [] []
datetime [] []
urllib3 [] []
google.type.decimal_pb2 [] []
google.api_core.path_template [] []
google.cloud.storage.hmac_key [] []
cryptography [] []
queue [] []
google.api.label_pb2 [] []
google.oauth2.credentials [] []
google.protobuf.util [] []
google.rpc.error_details_pb2 [] []
google.oauth2.id_token [] []
google._async_resumable_media._helpers [] []
google.longrunning.operations_pb2_grpc [] []
google.oauth2.gdch_credentials [] []
google.resumable_media.common [] []
google.api.launch_stage_pb2 [] []
google.api.resource_pb2 [] []
google.longrunning.operations_grpc_pb2 [] []
google.auth.app_engine [] []
google.api_core.operations_v1.operations_client_config [] []
google.api_core.client_info [] []
google.api_core.operations_v1.transports.rest [] []
google.api.documentation_pb2 [] []
google.cloud.storage.batch [] []
google.auth._exponential_backoff [] []
google.longrunning.operations_grpc [] []
copy [] []
functools [] []
google.cloud.extended_operations_pb2 [] []
google.auth.transport._mtls_helper [] []
re [] []
threading [] []
google.cloud.exceptions [] []
google [] []
copyreg [] []
google.auth.impersonated_credentials [] []
google.cloud.storage.constants [] []
google.cloud.storage.retry [] []
google.api_core.extended_operation [] []
google.cloud.storage.bucket ['fuzz_fileio'] []
calendar [] []
google.auth.pluggable [] []
google.protobuf.reflection [] []
google.api [] []
google.api.httpbody_pb2 [] []
google.cloud.storage [] []
google.api.quota_pb2 [] []
google.api.routing_pb2 [] []
google.auth._helpers [] []
google.api.logging_pb2 [] []
google.longrunning.operations_pb2 [] []
pprint [] []
google.cloud.storage.version [] []
google.longrunning.operations_proto [] []
google.api_core.operation_async [] []
google.protobuf [] []
warnings [] []
google.type.month_pb2 [] []
google.api_core.future.polling [] []
google._async_resumable_media.requests [] []
google.api.http_pb2 [] []
google.protobuf.wrappers_pb2 [] []
google.auth.crypt._helpers [] []
google.oauth2.reauth [] []
aiohttp [] []
google.type.calendar_period_pb2 [] []
google.api.log_pb2 [] []
google.auth._credentials_async [] []
atheris [] []
google.resumable_media._download [] []
google.auth.transport._custom_tls_signer [] []
google.protobuf.duration_pb2 [] []
email [] []
google.api_core.operations_v1.transports [] []
google.api_core.operations_v1.pagers [] []
uuid [] []
google.auth.compute_engine.credentials [] []
urllib [] []
google.auth.crypt [] []
mimetypes [] []
google.api_core.gapic_v1.config_async [] []
google.type.fraction_pb2 [] []
shutil [] []
google.protobuf.internal._parameterized [] []
google.protobuf.struct_pb2 [] []
google.auth.compute_engine [] []
google.cloud._http [] []
google.protobuf.field_mask_pb2 [] []
google.cloud._testing [] []
google.type.date_pb2 [] []
google._async_resumable_media [] []
google.api_core.future.base [] []
google.protobuf.pyext [] []
google.protobuf.internal.decoder [] []
google.auth.iam [] []
google.protobuf.internal.field_mask [] []
ctypes [] []

Directories in report

Directory