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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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import atheris
import sys
import os
import tempfile
from configparser import ParsingError
from utils import is_expected_exception_message

if getattr(sys, "frozen", False) and hasattr(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

with atheris.instrument_imports():
from git import Repo, GitCommandError, InvalidGitRepositoryError


def TestOneInput(data):
fdp = atheris.FuzzedDataProvider(data)

with tempfile.TemporaryDirectory() as repo_temp_dir:
repo = Repo.init(path=repo_temp_dir)
repo.index.commit("Initial commit")

try:
with tempfile.TemporaryDirectory() as submodule_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}")

with submodule.config_writer() as writer:
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))}",
)
with open(new_file_path, "wb") as new_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) as e:
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",
]
if is_expected_exception_message(e, expected_messages):
return -1
else:
raise e


def main():
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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import atheris # pragma: no cover
from typing import List # pragma: no cover


@atheris.instrument_func
def is_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()
for error in error_message_list:
if error.lower() in exception_message:
return True
return False
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