| 1 | # SPDX-License-Identifier: Apache-2.0 |
| 2 | # SPDX-FileCopyrightText: Copyright contributors to the vLLM project |
| 3 | """Tests for regex compilation timeout guard. |
| 4 | |
| 5 | Verifies that adversarial regex patterns that would cause exponential |
| 6 | DFA state-space explosion are rejected with a timeout rather than |
| 7 | hanging indefinitely. |
| 8 | |
| 9 | Addresses advisory GHSA-rwxx-mrjm-wc2m. |
| 10 | """ |
| 11 | |
| 12 | import time |
| 13 | from unittest.mock import patch |
| 14 | |
| 15 | import pytest |
| 16 | |
| 17 | from vllm.v1.structured_output.utils import compile_regex_with_timeout |
| 18 | |
| 19 | |
| 20 | class TestCompileRegexWithTimeout: |
| 21 | """Unit tests for the compile_regex_with_timeout utility.""" |
| 22 | |
| 23 | def test_normal_regex_compiles_successfully(self): |
| 24 | result = compile_regex_with_timeout(lambda pat: "compiled", r"[a-z]+") |
| 25 | assert result == "compiled" |
| 26 | |
| 27 | def test_timeout_raises_value_error(self): |
| 28 | def slow_compile(pattern: str): |
| 29 | time.sleep(10) |
| 30 | return "never" |
| 31 | |
| 32 | with ( |
| 33 | patch("vllm.envs.VLLM_REGEX_COMPILATION_TIMEOUT_S", 1), |
| 34 | pytest.raises(ValueError, match="timed out"), |
| 35 | ): |
| 36 | compile_regex_with_timeout(slow_compile, r"(a+)+b") |
| 37 | |
| 38 | def test_timeout_disabled_when_zero(self): |
| 39 | result = None |
| 40 | with patch("vllm.envs.VLLM_REGEX_COMPILATION_TIMEOUT_S", 0): |
| 41 | result = compile_regex_with_timeout(lambda pat: "no_timeout", r"(a+)+b") |
| 42 | assert result == "no_timeout" |
| 43 | |
| 44 | def test_compilation_error_propagates(self): |
| 45 | def failing_compile(pattern: str): |
| 46 | raise RuntimeError("compilation failed") |
| 47 | |
| 48 | with pytest.raises(RuntimeError, match="compilation failed"): |
| 49 | compile_regex_with_timeout(failing_compile, r"bad") |
| 50 | |
| 51 | def test_pattern_included_in_error_message(self): |
| 52 | def slow_compile(pattern: str): |
| 53 | time.sleep(10) |
| 54 | return "never" |
| 55 | |
| 56 | pattern = r"(a+)+b" |
| 57 | with ( |
| 58 | patch("vllm.envs.VLLM_REGEX_COMPILATION_TIMEOUT_S", 1), |
| 59 | pytest.raises(ValueError, match=r"\(a\+\)\+b"), |
| 60 | ): |
| 61 | compile_regex_with_timeout(slow_compile, pattern) |