{"record":{"id":"40e9ef8dbce52555","repo":"xtekky/gpt4free","slug":"invalid-file-path-file","errorCode":null,"errorMessage":"Invalid file path: '{file}'","messagePattern":"Invalid file path: '(.+?)'","errorType":"validation","errorClass":"PermissionError","httpStatus":null,"severity":"error","filePath":"g4f/mcp/pa_provider.py","lineNumber":543,"sourceCode":"        k: getattr(_builtins, k) for k in dir(_builtins) if k not in _blocked\n    }\n\n    # Provide a workspace-scoped open()\n    def _safe_open(file, mode=\"r\", *args, **kwargs):\n        \"\"\"open() restricted to the workspace directory.\"\"\"\n        path = Path(file)\n        if not path.is_absolute():\n            path = workspace / path\n        try:\n            resolved = path.resolve()\n            ws_resolved = workspace.resolve()\n            if not str(resolved).startswith(str(ws_resolved)):\n                raise PermissionError(\n                    f\"File access outside workspace is denied: '{file}'. \"\n                    f\"Workspace: {workspace}\"\n                )\n        except (ValueError, OSError) as exc:\n            raise PermissionError(f\"Invalid file path: '{file}'\") from exc\n        return open(resolved, mode, *args, **kwargs)\n\n    safe_builtins[\"open\"] = _safe_open\n    safe_builtins[\"__import__\"] = _make_restricted_import(allowed)\n\n    # Override print / input so stdout/stderr stay local to this sandbox\n    # execution and are never written to the real sys.stdout/stderr.  This\n    # avoids the global-state side-effect that contextlib.redirect_stdout\n    # would cause when the thread is abandoned after a timeout.\n    if stdout_buf is not None:\n        _real_print = _builtins.print\n\n        def _safe_print(*args, **kwargs):\n            kwargs.setdefault(\"file\", stdout_buf)\n            _real_print(*args, **kwargs)\n\n        safe_builtins[\"print\"] = _safe_print\n","sourceCodeStart":525,"sourceCodeEnd":561,"githubUrl":"https://github.com/xtekky/gpt4free/blob/973504e1770928ed5fb82f43da528f441ad9ddc3/g4f/mcp/pa_provider.py#L525-L561","documentation":"Raised by the sandbox open() shim when Path(file).resolve() itself raises ValueError or OSError — i.e. the path is malformed before any containment check happens. Typical causes: embedded NUL bytes, paths too long for the OS, or (on Windows) paths with invalid characters or nonexistent drive roots. The original exception is chained via 'from exc'.","triggerScenarios":"open('data\\x00.json'), an extremely long relative path that exceeds PATH_MAX during resolution, or a path containing characters the filesystem API rejects so that resolve() throws OSError/ValueError.","commonSituations":"Binary data or user input containing NUL bytes concatenated into a filename; machine-generated paths from LLM-written provider code; cross-platform scripts with Windows-invalid characters (* ? \" < > |) in names.","solutions":["Sanitize filenames before open(): strip control characters and NULs","Print/log the exact file value to find which call site produced the bad path","Construct paths with pathlib.Path components instead of string concatenation"],"exampleFix":"# before\nname = user_input  # may contain \\x00\nopen(name)\n\n# after\nname = user_input.replace('\\x00', '')\nopen(name)","handlingStrategy":"validation","validationCode":"def safe_filename(name: str) -> str:\n    return ''.join(ch for ch in name if ord(ch) > 31 and ch not in '<>:\"/\\\\|?*')","typeGuard":null,"tryCatchPattern":"try:\n    f = open(user_path)\nexcept PermissionError as e:\n    if \"Invalid file path\" in str(e):\n        user_path = safe_filename(user_path); f = open(user_path)","preventionTips":["Sanitize any filename derived from user/LLM input before open()","Build paths with pathlib.Path instead of string concatenation","Log the offending path value when this fires to find the bad producer"],"tags":["sandbox","filesystem","path-validation","pa-provider"],"backgroundTag":null,"analyzedSha":"973504e1770928ed5fb82f43da528f441ad9ddc3","analyzedAt":"2026-08-14T23:45:32.408Z","schemaVersion":2},"datasetVersion":"2026-08-15T17:31:12.345Z"}