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Add Submodules Fuzz Target#1919

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93 changes: 93 additions & 0 deletionsfuzzing/fuzz-targets/fuzz_submodule.py
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importatheris
importsys
importos
importtempfile
fromconfigparserimportParsingError
fromutilsimportis_expected_exception_message

ifgetattr(sys,"frozen",False)andhasattr(sys,"_MEIPASS"):
path_to_bundled_git_binary=os.path.abspath(os.path.join(os.path.dirname(__file__),"git"))
os.environ["GIT_PYTHON_GIT_EXECUTABLE"]=path_to_bundled_git_binary

withatheris.instrument_imports():
fromgitimportRepo,GitCommandError,InvalidGitRepositoryError


defTestOneInput(data):
fdp=atheris.FuzzedDataProvider(data)

withtempfile.TemporaryDirectory()asrepo_temp_dir:
repo=Repo.init(path=repo_temp_dir)
repo.index.commit("Initial commit")

try:
withtempfile.TemporaryDirectory()assubmodule_temp_dir:
sub_repo=Repo.init(submodule_temp_dir,bare=fdp.ConsumeBool())
sub_repo.index.commit(fdp.ConsumeUnicodeNoSurrogates(fdp.ConsumeIntInRange(1,512)))

submodule_name=f"submodule_{fdp.ConsumeUnicodeNoSurrogates(fdp.ConsumeIntInRange(1,512))}"
submodule_path=os.path.join(repo.working_tree_dir,submodule_name)
submodule_url=sub_repo.git_dir

submodule=repo.create_submodule(submodule_name,submodule_path,url=submodule_url)
repo.index.commit(f"Added submodule{submodule_name}")

withsubmodule.config_writer()aswriter:
key_length=fdp.ConsumeIntInRange(1,max(1,fdp.remaining_bytes()))
value_length=fdp.ConsumeIntInRange(1,max(1,fdp.remaining_bytes()))

writer.set_value(
fdp.ConsumeUnicodeNoSurrogates(key_length),fdp.ConsumeUnicodeNoSurrogates(value_length)
)
writer.release()

submodule.update(init=fdp.ConsumeBool(),dry_run=fdp.ConsumeBool(),force=fdp.ConsumeBool())

submodule_repo=submodule.module()
new_file_path=os.path.join(
submodule_repo.working_tree_dir,
f"new_file_{fdp.ConsumeUnicodeNoSurrogates(fdp.ConsumeIntInRange(1,512))}",
)
withopen(new_file_path,"wb")asnew_file:
new_file.write(fdp.ConsumeBytes(fdp.ConsumeIntInRange(1,512)))
submodule_repo.index.add([new_file_path])
submodule_repo.index.commit("Added new file to submodule")

repo.submodule_update(recursive=fdp.ConsumeBool())
submodule_repo.head.reset(commit="HEAD~1",working_tree=fdp.ConsumeBool(),head=fdp.ConsumeBool())
# Use fdp.PickValueInList to ensure at least one of 'module' or 'configuration' is True
module_option_value,configuration_option_value=fdp.PickValueInList(
[(True,False), (False,True), (True,True)]
)
submodule.remove(
module=module_option_value,
configuration=configuration_option_value,
dry_run=fdp.ConsumeBool(),
force=fdp.ConsumeBool(),
)
repo.index.commit(f"Removed submodule{submodule_name}")

except (ParsingError,GitCommandError,InvalidGitRepositoryError,FileNotFoundError,BrokenPipeError):
return-1
except (ValueError,OSError)ase:
expected_messages= [
"SHA is empty",
"Reference at",
"embedded null byte",
"This submodule instance does not exist anymore",
"cmd stdin was empty",
"File name too long",
]
ifis_expected_exception_message(e,expected_messages):
return-1
else:
raisee


defmain():
atheris.Setup(sys.argv,TestOneInput)
atheris.Fuzz()


if__name__=="__main__":
main()
22 changes: 22 additions & 0 deletionsfuzzing/fuzz-targets/utils.py
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importatheris# pragma: no cover
fromtypingimportList# pragma: no cover


@atheris.instrument_func
defis_expected_exception_message(exception:Exception,error_message_list:List[str])->bool:# pragma: no cover
"""
Checks if the message of a given exception matches any of the expected error messages, case-insensitively.
Args:
exception (Exception): The exception object raised during execution.
error_message_list (List[str]): A list of error message substrings to check against the exception's message.
Returns:
bool: True if the exception's message contains any of the substrings from the error_message_list,
case-insensitively, otherwise False.
"""
exception_message=str(exception).lower()
forerrorinerror_message_list:
iferror.lower()inexception_message:
returnTrue
returnFalse
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