Patched code sample

import sqlite3
import logging

def read_sqlite(db_path: str) -> dict:
    """
    Reads data from all tables in a SQLite database,
    safely quoting table names to prevent SQL injection.

    This function represents the patched version of the code, fixing the
    vulnerability where table names were unsafely formatted into SQL queries.
    """
    db_data = {}
    try:
        conn = sqlite3.connect(f'file:{db_path}?mode=ro', uri=True)
        cursor = conn.cursor()

        # Get all table names from the master table
        cursor.execute("SELECT name FROM sqlite_master WHERE type='table';")
        tables = cursor.fetchall()

        for table_name_tuple in tables:
            table_name = table_name_tuple[0]

            # FIX: Properly quote the table name to prevent SQL injection.
            # SQLite uses double quotes for identifiers. Any double quotes
            # within the identifier must be escaped by doubling them up ("").
            # This prevents an attacker-controlled table name from breaking
            # out of the query string and executing malicious commands.
            # Example malicious table name: 'users"; DROP TABLE "users'
            quoted_table_name = f'"{table_name.replace("\"", "\"\"")}"'

            # Construct the query using the safely quoted table name
            query = f"SELECT * FROM {quoted_table_name};"

            try:
                cursor.execute(query)
                rows = cursor.fetchall()
                column_names = [desc[0] for desc in cursor.description] if cursor.description else []
                db_data[table_name] = {
                    'column_names': column_names,
                    'rows': rows,
                }
            except sqlite3.Error as e:
                logging.error(f"Could not query table {quoted_table_name}: {e}")
                db_data[table_name] = {'error': str(e)}

    except sqlite3.Error as e:
        logging.error(f"Database connection or query error: {e}")
        return {'error': str(e)}
    finally:
        if 'conn' in locals() and conn:
            conn.close()

    return db_data