T09 · Insecure Skill Coding Practices
Error
- Location
src/gate.py:77- Finding
Git Diff Failures Are Misclassified as Safe Review Skips
- Content
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bool: """判断是否应该跳过审查。""" diff = self.get_diff() if not diff.strip(): print("No changes detected. Skipping review.") return True ``` ```python def run(self) -> int: """执行门禁检查，返回退出码。""" if self.should_skip(): return 3 # 跳过 ``` ### Technical Analysis The `get_diff()` method does not inspect `subprocess.run()`'s return code and does not use `check=True`. If `git diff` fails, Git normally writes an error to stderr, returns a nonzero status, and may leave stdout empty. The method discards that failure state and returns only stdout. The empty result is subsequently interpreted by `should_skip()` as evidence that there are no changes. `run()` then returns exit code 3 without executing any of the seven review checkers. The documented gate behavior identifies exit code 3 as a non-blocking skip, so a Git error can become an approval-equivalent outcome. The subprocess call uses an argument array and does not enable a shell, so this is not a command-injection vulnerability. The issue is specifically the failure to distinguish a valid empty diff from an unsuccessful Git operation. ### Attack Path 1. An attacker or misconfigured CI invocation supplies an invalid, missing, or ambiguous revision through `--base` or `--head`. 2. The application constructs and runs `git diff ..`. 3. Git returns a nonzero exit status and writes diagnostic information to stderr. 4. `get_diff()` ignores both the nonzero status and stderr and returns emp ...[truncated 749 chars]- Remediation
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