FIX: prevent native log format-string injection

mssql_python/pybind/CMakeLists.txt

@@ -370,10 +370,13 @@ if(MSVC)
 endif()
 
 # Add warning flags for GCC/Clang on Linux and macOS
-if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" OR CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" OR CMAKE_CXX_COMPILER_ID STREQUAL "Clang" OR
+   CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")
     target_compile_options(ddbc_bindings PRIVATE 
         -Werror        # Treat warnings as errors
         -Wattributes   # Enable attribute warnings (cross-compiler)
+        -Wformat=2     # Check nonliteral formats and printf argument types
+        -Werror=format-security  # Explicitly keep format-security diagnostics fatal
     )
 
     # GCC-specific warning flags

mssql_python/pybind/ddbc_bindings.cpp

@@ -2746,8 +2746,9 @@ SQLRETURN BindParameterArray(SqlHandle& handle, SQLHANDLE hStmt, const py::list&
                             if (PyBytes_GET_SIZE(b.ptr()) != 16) {
                                 LOG("BindParameterArray: GUID bytes wrong "
                                     "length - param_index=%d, row=%zu, "
-                                    "length=%d",
-                                    paramIndex, i, PyBytes_GET_SIZE(b.ptr()));
+                                    "length=%lld",
+                                    paramIndex, i,
+                                    static_cast<long long>(PyBytes_GET_SIZE(b.ptr())));
                                 ThrowStdException("UUID binary data must be "
                                                   "exactly 16 bytes long.");
                             }
@@ -2774,8 +2775,8 @@ SQLRETURN BindParameterArray(SqlHandle& handle, SQLHANDLE hStmt, const py::list&
                         strLenOrIndArray[i] = sizeof(SQLGUID);
                     }
                     LOG("BindParameterArray: SQL_C_GUID bound - "
-                        "param_index=%d, null=%zu, bytes=%zu, uuid_obj=%zu",
-                        paramIndex);
+                        "param_index=%d, count=%zu",
+                        paramIndex, paramSetSize);
                     dataPtr = guidArray;
                     bufferLength = sizeof(SQLGUID);
                     break;
@@ -4357,7 +4358,7 @@ SQLRETURN FetchBatchData(SQLHSTMT hStmt, ColumnBuffers& buffers, py::list& colum
             }
             if (dataLen == SQL_NO_TOTAL) {
                 LOG("Cannot determine the length of the data. Returning NULL "
-                    "value instead. Column ID - {}",
+                    "value instead. Column ID - %d",
                     col);
                 Py_INCREF(Py_None);
                 PyList_SET_ITEM(row, col - 1, Py_None);
@@ -4383,7 +4384,7 @@ SQLRETURN FetchBatchData(SQLHSTMT hStmt, ColumnBuffers& buffers, py::list& colum
             if (dataLen == 0) {
                 // Handle zero-length (non-NULL) data for complex types
                 LOG("Column data length is 0 for complex datatype. Setting "
-                    "None to the result row. Column ID - {}",
+                    "None to the result row. Column ID - %d",
                     col);
                 Py_INCREF(Py_None);
                 PyList_SET_ITEM(row, col - 1, Py_None);
@@ -4418,7 +4419,7 @@ SQLRETURN FetchBatchData(SQLHSTMT hStmt, ColumnBuffers& buffers, py::list& colum
                     } catch (const py::error_already_set& e) {
                         // Handle the exception, e.g., log the error and set
                         // py::none()
-                        LOG("Error converting to decimal: {}", e.what());
+                        LOG("Error converting to decimal: %s", e.what());
                         Py_INCREF(Py_None);
                         PyList_SET_ITEM(row, col - 1, Py_None);
                     }
@@ -5020,7 +5021,7 @@ SQLRETURN FetchArrowBatch_wrap(SqlHandlePtr StatementHandle, py::list& capsules,
                 errorString << "Unsupported data type for Arrow batch fetch for column - "
                             << columnName.c_str() << ", Type - " << dataType << ", column ID - "
                             << (i + 1);
-                LOG(errorString.str().c_str());
+                LOG("FetchArrowBatch: %s", errorString.str().c_str());
                 ThrowStdException(errorString.str());
                 break;
         }
@@ -5545,7 +5546,7 @@ SQLRETURN FetchArrowBatch_wrap(SqlHandlePtr StatementHandle, py::list& capsules,
                         std::ostringstream errorString;
                         errorString << "Unsupported data type for column ID - " << (idxCol + 1)
                                     << ", Type - " << dataType;
-                        LOG(errorString.str().c_str());
+                        LOG("FetchArrowBatch: %s", errorString.str().c_str());
                         ThrowStdException(errorString.str());
                         break;
                     }

mssql_python/pybind/logger_bridge.hpp

@@ -25,6 +25,13 @@ namespace py = pybind11;
 namespace mssql_python {
 namespace logging {
 
+#if defined(__GNUC__) || defined(__clang__)
+#define MSSQL_PRINTF_FORMAT(format_index, first_argument) \
+    __attribute__((format(printf, format_index, first_argument)))  // DevSkim: ignore DS154189
+#else
+#define MSSQL_PRINTF_FORMAT(format_index, first_argument)
+#endif
+
 // Log level constants (matching Python levels)
 // Note: Avoid using ERROR as it conflicts with Windows.h macro
 const int LOG_LEVEL_DEBUG = 10;     // Debug/diagnostic logging
@@ -81,7 +88,8 @@ class LoggerBridge {
      * @param format Printf-style format string
      * @param ... Variable arguments for format string
      */
-    static void log(int level, const char* file, int line, const char* format, ...);
+    static void log(int level, const char* file, int line, const char* format, ...)
+        MSSQL_PRINTF_FORMAT(4, 5);
 
     /**
      * Get the current log level.
@@ -124,7 +132,8 @@ class LoggerBridge {
      * @param args Variable arguments
      * @return Formatted string
      */
-    static std::string formatMessage(const char* format, va_list args);
+    static std::string formatMessage(const char* format, va_list args)
+        MSSQL_PRINTF_FORMAT(1, 0);
 
     /**
      * Helper to extract filename from full path.
@@ -138,6 +147,8 @@ class LoggerBridge {
 }  // namespace logging
 }  // namespace mssql_python
 
+#undef MSSQL_PRINTF_FORMAT
+
 // Convenience macros for logging
 // Single LOG() macro for all diagnostic logging (DEBUG level)
 

tests/test_039_native_logging_format_security.py

@@ -0,0 +1,62 @@
+"""Regression guards for native printf-style logging."""
+
+import re
+from pathlib import Path
+
+import pytest
+
+_PYBIND_DIR = Path(__file__).resolve().parents[1] / "mssql_python" / "pybind"
+_LOGGER_HEADER = _PYBIND_DIR / "logger_bridge.hpp"
+_CMAKE = _PYBIND_DIR / "CMakeLists.txt"
+pytestmark = pytest.mark.skipif(
+    not _PYBIND_DIR.is_dir(),
+    reason="requires a source checkout; isolated wheel tests omit the source tree",
+)
+
+
+def _code_without_comments(text):
+    text = re.sub(
+        r"/\*.*?\*/",
+        lambda match: "\n" * match.group().count("\n"),
+        text,
+        flags=re.DOTALL,
+    )
+    return "\n".join(
+        "" if line.lstrip().startswith("#define LOG") else re.sub(r"//.*", "", line)
+        for line in text.splitlines()
+    )
+
+
+def test_native_log_calls_use_literal_format_strings():
+    dynamic_calls = []
+    pattern = re.compile(r"\bLOG(?:_INFO|_WARNING|_ERROR)?\s*\(\s*(.)")
+    paths = (
+        path
+        for suffix in ("*.cpp", "*.hpp", "*.h")
+        for path in _PYBIND_DIR.rglob(suffix)
+        if "build" not in path.relative_to(_PYBIND_DIR).parts
+    )
+    for path in paths:
+        code = _code_without_comments(path.read_text(encoding="utf-8"))
+        for match in pattern.finditer(code):
+            if match.group(1) != '"':
+                line_number = code.count("\n", 0, match.start()) + 1
+                source_line = code.splitlines()[line_number - 1].strip()
+                dynamic_calls.append(
+                    f"{path.relative_to(_PYBIND_DIR)}:{line_number}: {source_line}"
+                )
+
+    assert not dynamic_calls, f"native LOG calls must use literal format strings: {dynamic_calls}"
+
+
+def test_logger_bridge_enables_compile_time_format_checks():
+    header = _LOGGER_HEADER.read_text(encoding="utf-8")
+    cmake = _CMAKE.read_text(encoding="utf-8")
+
+    assert "__attribute__((format(printf, format_index, first_argument)))" in header
+    assert "DevSkim: ignore DS154189" in header
+    assert "MSSQL_PRINTF_FORMAT(4, 5)" in header
+    assert "MSSQL_PRINTF_FORMAT(1, 0)" in header
+    assert 'CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang"' in cmake
+    assert "-Wformat=2" in cmake
+    assert "-Werror=format-security" in cmake