mirror of
https://github.com/Abdess/retroarch_system.git
synced 2026-11-01 07:33:45 -06:00
Abdessamad Derraz
e440073562
bwrap now binds only /usr, the /lib* and /bin links and the files of /etc the loader, fonts, TLS, the clock and user lookups read. Home, /tmp and /mnt are empty, the core, content and staged system directory read-only, the scratch folder the one writable path, every namespace unshared. --require-sandbox refuses to run without it. The worker imports nothing from the repository.
423 lines
22 KiB
Python
423 lines
22 KiB
Python
"""core_probe runs a libretro core headless and records what it measured.
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The parsers are checked on fixed inputs. One test builds a ten-line
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libretro core with the C compiler, when there is one, and runs the whole
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probe on it: staging, the worker process, strace, the record and its schema.
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"""
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from __future__ import annotations
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import argparse
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import contextlib
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import io
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import json
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import os
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import shutil
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import struct
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import subprocess
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import sys
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import tempfile
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import unittest
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import unittest.mock
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from pathlib import Path
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REPO_ROOT = Path(__file__).resolve().parent.parent
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sys.path.insert(0, str(REPO_ROOT / "scripts"))
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import core_probe
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import measurement_records
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STRACE_SAMPLE = """\
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4242 openat(AT_FDCWD, "/sys/bios/card.bin", O_RDONLY) = 5
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4242 openat(AT_FDCWD, "/sys/bios/missing.bin", O_RDONLY) = -1 ENOENT (No such file or directory)
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[pid 4243] open("/sys/bios/sub/x.rom", O_RDONLY|O_CLOEXEC) = 7
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4242 openat(AT_FDCWD, "/elsewhere/game.cue", O_RDONLY) = 3
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4242 read(3, "...", 10) = 10
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"""
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FAKE_CORE = r"""
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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struct retro_system_info { const char *n, *v, *e; bool full, block; };
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struct retro_game_geometry { unsigned bw, bh, mw, mh; float a; };
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struct retro_system_timing { double fps, rate; };
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struct retro_system_av_info { struct retro_game_geometry g; struct retro_system_timing t; };
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struct retro_log_callback { void (*log)(int, const char *, ...); };
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typedef bool (*env_t)(unsigned, void *);
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typedef void (*video_t)(const void *, unsigned, unsigned, size_t);
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typedef size_t (*batch_t)(const int16_t *, size_t);
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typedef int16_t (*input_t)(unsigned, unsigned, unsigned, unsigned);
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static env_t env; static video_t video; static batch_t batch; static input_t input;
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static unsigned ports, frames; static struct retro_log_callback logger;
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static uint16_t pixels[4 * 2]; static unsigned char card;
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void retro_set_environment(env_t e) { bool t = true; env = e; env(18, &t); }
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void retro_set_video_refresh(video_t v) { video = v; }
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void retro_set_audio_sample(void *f) { (void)f; }
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void retro_set_audio_sample_batch(batch_t b) { batch = b; }
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void retro_set_input_poll(void *f) { (void)f; }
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void retro_set_input_state(input_t f) { input = f; }
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void retro_set_controller_port_device(unsigned port, unsigned device) { (void)port; if (device == 1) ports++; }
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void retro_get_system_info(struct retro_system_info *i) {
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i->n = "Fake"; i->v = "1"; i->e = ""; i->full = true; i->block = false; }
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void retro_get_system_av_info(struct retro_system_av_info *i) {
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memset(i, 0, sizeof *i); i->t.fps = 60.0; i->t.rate = 44100.0; }
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void retro_init(void) {}
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void retro_deinit(void) {}
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bool retro_load_game(const void *g) {
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const char *dir = NULL; char path[4096]; struct retro_log_callback cb;
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const char *tag = getenv("CORE_PROBE_TEST_TAG");
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(void)g; env(9, &dir);
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snprintf(path, sizeof path, "%s/card.bin", dir);
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FILE *f = fopen(path, "rb");
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card = 0;
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if (f) { int c = fgetc(f); card = c < 0 ? 0 : (unsigned char)c; fclose(f); }
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if (env(27, &cb)) {
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logger = cb;
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cb.log(1, "card %s byte %d\n", f ? "present" : "absent", (int)card);
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cb.log(1, "tag %s\n", tag ? tag : "unset"); }
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return true; }
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void retro_unload_game(void) {}
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void retro_run(void) {
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int16_t s[4] = {1, 2, 3, 4};
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if (frames++ == 0 && logger.log) logger.log(1, "ports %u\n", ports);
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input(0, 1, 0, 8);
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for (int i = 0; i < 8; i++) pixels[i] = card;
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video(pixels, 4, 2, 8); batch(s, 2); }
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size_t retro_serialize_size(void) { return 1; }
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bool retro_serialize(void *d, size_t n) { (void)n; *(unsigned char *)d = card; return true; }
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"""
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def mednafen_state(sections: dict[str, dict[str, bytes]]) -> bytes:
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body = b""
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for section, entries in sections.items():
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chunk = b"".join(bytes([len(name)]) + name.encode() + struct.pack("<I", len(value)) + value
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for name, value in entries.items())
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body += section.encode().ljust(32, b"\0") + struct.pack("<I", len(chunk)) + chunk
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return b"MDFNSVST".ljust(32, b"\0") + body
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def checkout(path: Path) -> Path:
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"""A folder made the root of a git checkout, as --record requires."""
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path.mkdir(parents=True, exist_ok=True)
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subprocess.run(["git", "init", "-q", str(path)], check=True)
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return path
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class ParsingTests(unittest.TestCase):
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def test_assignment(self) -> None:
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self.assertEqual(core_probe.parse_assignment("a=b=c", "--option"), ("a", "b=c"))
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self.assertEqual(core_probe.parse_assignment("dest=", "--vary"), ("dest", ""))
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for bad in ("novalue", "=x"):
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with self.assertRaises(argparse.ArgumentTypeError):
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core_probe.parse_assignment(bad, "--option")
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def test_press(self) -> None:
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self.assertEqual(core_probe.parse_press("120:start"), (120, 3, 1))
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self.assertEqual(core_probe.parse_press("5:A:10"), (5, 8, 10))
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for bad in ("x:a", "1:turbo", "1:a:0", "-1:a", "1"):
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with self.assertRaises(argparse.ArgumentTypeError):
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core_probe.parse_press(bad)
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def test_strace(self) -> None:
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calls = core_probe.parse_strace(STRACE_SAMPLE)
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self.assertEqual([c["path"] for c in calls],
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["/sys/bios/card.bin", "/sys/bios/missing.bin", "/sys/bios/sub/x.rom",
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"/elsewhere/game.cue"])
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self.assertEqual([c["ok"] for c in calls], [True, False, True, True])
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self.assertEqual(calls[1]["errno"], "ENOENT")
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opened, absent = core_probe.files_under(calls, Path("/sys/bios"))
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self.assertEqual(opened, ["card.bin", "sub/x.rom"])
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self.assertEqual(absent, ["missing.bin"])
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def test_printf(self) -> None:
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name = core_probe.ctypes.create_string_buffer(b"mpeg_card.bin")
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address = core_probe.ctypes.addressof(name)
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self.assertEqual(core_probe.render_printf(b"open %s: %d%% %x\n", [address, 50, 255]),
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"open mpeg_card.bin: 50% ff")
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self.assertEqual(core_probe.render_printf(b"%d", [0xFFFFFFFF]), "-1")
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self.assertEqual(core_probe.render_printf(b"%.2f fps %u", [7]), "<double> fps 7")
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self.assertEqual(core_probe.render_printf(b"%s", [0]), "(null)")
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def test_mednafen_state(self) -> None:
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state = b"\x00" * 7 + mednafen_state({"MPEG": {"Present": b"\x01", "AuthState": b"\x02"},
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"CDB": {"Word": b"\x34\x12"}})
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self.assertEqual(core_probe.mednafen_state_vars(state),
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{"MPEG.Present": "01", "MPEG.AuthState": "02", "CDB.Word": "3412"})
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self.assertEqual(core_probe.mednafen_state_vars(b"no state"), {})
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def test_elf_comment(self) -> None:
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self.assertIsInstance(core_probe.elf_comment(Path(sys.executable).resolve()), list)
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with tempfile.NamedTemporaryFile(dir=REPO_ROOT / "tmp" / "tests") as handle:
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handle.write(b"not an elf")
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handle.flush()
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self.assertEqual(core_probe.elf_comment(Path(handle.name)), [])
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def test_env_file_recorded_by_name_and_hash(self) -> None:
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library = Path(sys.executable).resolve()
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described = core_probe.describe_env_value(str(library))
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self.assertEqual(described, f"{library.name} sha256:{core_probe.file_digest(library, 'sha256')}")
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self.assertEqual(core_probe.describe_env_value("2000-01-01 00:00:00"), "2000-01-01 00:00:00")
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def test_uniform_frame(self) -> None:
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self.assertTrue(core_probe.uniform_frame(b"", 2))
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self.assertTrue(core_probe.uniform_frame(b"\x01\x02" * 8, 2))
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self.assertFalse(core_probe.uniform_frame(b"\x01\x02" * 7 + b"\x01\x03", 2))
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self.assertFalse(core_probe.uniform_frame(b"\x00\x00\x00\x00\x00\x00\x00\x01", 4))
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def test_cue_tracks(self) -> None:
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with tempfile.TemporaryDirectory(dir=REPO_ROOT / "tmp" / "tests") as tmp:
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cue = Path(tmp, "d.cue")
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cue.write_text('FILE "a b.bin" BINARY\n TRACK 01 MODE2/2352\nFILE c.bin BINARY\n',
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encoding="utf-8")
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self.assertEqual([p.name for p in core_probe.cue_tracks(cue)], ["a b.bin", "c.bin"])
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class ResultTests(unittest.TestCase):
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@staticmethod
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def variant(label: str, value: str, loaded: bool = True) -> dict:
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return {"label": label, "flags": [],
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"repetitions": [{"loaded": loaded, "observables": {"video_sha1": value}}]}
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def test_same_differs_inconclusive(self) -> None:
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same = core_probe.check_result([self.variant("a", "1"), self.variant("b", "1")], "video_sha1")
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self.assertEqual(same["status"], "same")
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differs = core_probe.check_result([self.variant("a", "1"), self.variant("b", "2")], "video_sha1")
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self.assertEqual(differs["status"], "differs")
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self.assertEqual(len(differs["groups"]), 2)
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flagged = core_probe.check_result([self.variant("a", "1", loaded=False), self.variant("b", "1")],
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"video_sha1")
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self.assertEqual(flagged["status"], "inconclusive")
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def test_other_observable_does_not_void_the_check(self) -> None:
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variant = {"label": "a", "flags": ["repetition 1 disagrees with repetition 0 on state_sha1"],
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"repetitions": [{"loaded": True, "observables": {"video_sha1": "1", "state_sha1": "x"}},
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{"loaded": True, "observables": {"video_sha1": "1", "state_sha1": "y"}}]}
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result = core_probe.check_result([variant], "video_sha1")
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self.assertEqual(result["status"], "same")
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self.assertIn("Other flags", result["statement"])
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self.assertEqual(core_probe.check_result([variant], "state_sha1")["status"], "inconclusive")
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def test_host_paths_hidden(self) -> None:
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places = [("/tmp/x/system", "<system>"), ("/tmp/x", "<repo>")]
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self.assertEqual(core_probe.host_paths_hidden("/tmp/x/system/bios.bin NOT FOUND", places),
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"<system>/bios.bin NOT FOUND")
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def test_timing_stats(self) -> None:
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stats = core_probe.timing_stats([1.0, 2.0, 3.0, 4.0, 10.0])
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self.assertEqual((stats["median"], stats["mean"], stats["min"], stats["max"]), (3.0, 4.0, 1.0, 10.0))
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self.assertEqual(stats["raw"], [1.0, 2.0, 3.0, 4.0, 10.0])
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def test_refusals(self) -> None:
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parser = core_probe.build_parser()
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core = sys.executable
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bench = parser.parse_args(["bench", "--core", core, "--record", "x", "--repeat", "3"])
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self.assertIn("a recorded benchmark needs --repeat >= 5", core_probe.validate_args(bench))
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check = parser.parse_args(["check", "--core", core, "--vary", "a=", "--vary", "b=",
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"--observable", "video_sha1", "--claim", "c", "--method", "m"])
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self.assertTrue(any("same DEST" in p for p in core_probe.validate_args(check)))
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unknown = parser.parse_args(["check", "--core", core, "--vary", "a=", "--observable", "nope",
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"--claim", "c", "--method", "m"])
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self.assertTrue(any("--observable nope" in p for p in core_probe.validate_args(unknown)))
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@unittest.skipUnless(shutil.which("cc"), "no C compiler")
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class FakeCoreTests(unittest.TestCase):
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"""The whole probe against a core compiled from FAKE_CORE."""
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@classmethod
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def setUpClass(cls) -> None:
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cls.tmp = Path(tempfile.mkdtemp(dir=REPO_ROOT / "tmp" / "tests"))
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source = cls.tmp / "fake.c"
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source.write_text(FAKE_CORE, encoding="utf-8")
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cls.core = cls.tmp / "fake_libretro.so"
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subprocess.run(["cc", "-shared", "-fPIC", "-o", str(cls.core), str(source)], check=True)
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cls.cards = []
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for byte in (b"\x01", b"\x01", b"\x02"):
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path = cls.tmp / f"card{len(cls.cards)}.bin"
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path.write_bytes(byte)
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cls.cards.append(path)
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@classmethod
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def tearDownClass(cls) -> None:
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shutil.rmtree(cls.tmp, ignore_errors=True)
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def probe(self, argv: list[str]) -> tuple[int, dict | None]:
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out = io.StringIO()
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with contextlib.redirect_stdout(out), contextlib.redirect_stderr(io.StringIO()):
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code = core_probe.main(argv + ["--work-dir", str(self.tmp / "work")])
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return code, json.loads(out.getvalue()) if code == 0 else None
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def test_run_record(self) -> None:
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record_dir = checkout(self.tmp / "records")
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code, record = self.probe(["check", "--core", str(self.core), "--frames", "3",
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"--vary", f"card.bin={self.cards[0]}", "--vary", f"card.bin={self.cards[1]}",
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"--vary", f"card.bin={self.cards[2]}", "--vary", "card.bin=",
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"--observable", "frame_sha1", "--claim", "c", "--method", "m",
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"--record", str(record_dir), "--max-load", "1000",
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"--env", "CORE_PROBE_TEST_TAG=set-by-test", "--press", "0:a:2"])
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self.assertEqual(code, 0)
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result = record["check"]["result"]
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self.assertEqual(result["status"], "differs")
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self.assertEqual(sorted(len(g["variants"]) for g in result["groups"]), [1, 1, 2])
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first = record["variants"][0]["repetitions"][0]
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self.assertEqual(first["logs"][0]["text"], "card present byte 1")
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self.assertEqual(first["logs"][1]["text"], "tag set-by-test")
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self.assertEqual(first["logs"][2]["text"], "ports 2")
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self.assertEqual((first["input_queries"], first["input_pressed"]), (3, 2))
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self.assertEqual(record["inputs"]["env"], {"CORE_PROBE_TEST_TAG": "set-by-test"})
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self.assertEqual(record["variants"][3]["repetitions"][0]["logs"][0]["text"], "card absent byte 0")
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if first["tracing"] == "strace":
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self.assertEqual([f["path"] for f in first["files_opened"]], ["card.bin"])
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self.assertEqual(record["variants"][3]["repetitions"][0]["files_probed_absent"], ["card.bin"])
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self.assertEqual(first["frames"], 3)
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self.assertEqual(record["emulator"], "fake")
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self.assertEqual([p.relative_to(record_dir).as_posix()
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for p in record_dir.rglob("*") if p.is_file() and ".git" not in p.parts],
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["measurements/fake.jsonl"])
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line = json.loads((record_dir / "measurements" / "fake.jsonl").read_text())
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self.assertEqual(measurement_records.check_line(line), [])
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# The line is the record the run printed, id included.
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self.assertEqual(line, record)
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try:
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from jsonschema import Draft202012Validator
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except ImportError:
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return
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schema = json.loads((REPO_ROOT / "schemas" / "core-probe-record.schema.json").read_text())
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self.assertEqual(list(Draft202012Validator(schema).iter_errors(line)), [])
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def test_second_run_is_appended_beside_the_first(self) -> None:
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record_dir = checkout(self.tmp / "appended")
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argv = ["run", "--core", str(self.core), "--frames", "1", "--no-trace", "--max-load", "1000",
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"--record", str(record_dir), "--subject", "smoke"]
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self.assertEqual(self.probe(argv)[0], 0)
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lines = record_dir / "measurements" / "fake.jsonl"
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first = lines.read_text()
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code, record = self.probe(argv)
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self.assertEqual(code, 0)
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self.assertTrue(lines.read_text().startswith(first))
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ids = [json.loads(line)["id"] for line in lines.read_text().splitlines()]
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self.assertEqual(len(ids), 2)
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code, corrected = self.probe(argv + ["--supersedes", ids[0]])
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self.assertEqual((code, corrected["supersedes"]), (0, ids[0]))
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code, _ = self.probe(argv + ["--supersedes", "2000-01-01-000000000000"])
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self.assertEqual(code, 2)
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self.assertEqual(len(lines.read_text().splitlines()), 3)
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def test_record_defaults_to_this_checkout(self) -> None:
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parser = core_probe.build_parser()
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args = parser.parse_args(["run", "--core", sys.executable, "--record", "--frames", "1"])
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self.assertEqual(Path(args.record), REPO_ROOT)
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self.assertIsNone(parser.parse_args(["run", "--core", sys.executable]).record)
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def test_bench_stats(self) -> None:
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code, record = self.probe(["bench", "--core", str(self.core), "--frames", "2", "--warmup", "1",
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"--repeat", "5", "--no-trace", "--max-load", "1000"])
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self.assertEqual(code, 0)
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self.assertEqual(len(record["timing"]["ms_per_frame"]["raw"]), 5)
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self.assertEqual(record["variants"][0]["repetitions"][0]["tracing"], "disabled: --no-trace")
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self.assertEqual(record["flags"], [])
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def test_busy_machine_refused(self) -> None:
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refused = checkout(self.tmp / "refused")
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code, _ = self.probe(["run", "--core", str(self.core), "--frames", "1", "--record",
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str(refused), "--max-load", "-1"])
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self.assertEqual(code, 3)
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self.assertFalse((refused / "measurements").exists())
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def test_record_names_a_checkout_root(self) -> None:
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# --record measurements wrote measurements/measurements/<emulator>.jsonl.
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root = checkout(self.tmp / "rooted")
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(root / "measurements").mkdir()
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for wrong in (root / "measurements", self.tmp / "plain"):
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wrong.mkdir(exist_ok=True)
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err = io.StringIO()
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with contextlib.redirect_stdout(io.StringIO()), contextlib.redirect_stderr(err):
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code = core_probe.main(["run", "--core", str(self.core), "--frames", "1", "--no-trace",
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"--record", str(wrong), "--work-dir", str(self.tmp / "work")])
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self.assertEqual(code, 2)
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self.assertIn("not a git checkout root", err.getvalue())
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self.assertIn("--record .", err.getvalue())
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self.assertFalse((wrong / "measurements" / "fake.jsonl").exists())
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self.assertIsNone(core_probe.not_a_checkout_root(root))
|
|
self.assertIsNone(core_probe.not_a_checkout_root(REPO_ROOT))
|
|
|
|
def test_the_core_sees_only_the_env_it_was_given(self) -> None:
|
|
os.environ["CORE_PROBE_TEST_TAG"] = "from-the-host"
|
|
os.environ["GITHUB_TOKEN"] = "secret"
|
|
try:
|
|
code, record = self.probe(["run", "--core", str(self.core), "--frames", "1",
|
|
"--no-trace"])
|
|
finally:
|
|
del os.environ["CORE_PROBE_TEST_TAG"]
|
|
del os.environ["GITHUB_TOKEN"]
|
|
self.assertEqual(code, 0)
|
|
rep = record["variants"][0]["repetitions"][0]
|
|
self.assertEqual(rep["logs"][1]["text"], "tag unset")
|
|
self.assertTrue(rep["isolation"] == "bwrap" or rep["isolation"].startswith("environment only"))
|
|
|
|
|
|
class Sandbox(unittest.TestCase):
|
|
"""What a core run under bubblewrap can reach: an allowlist."""
|
|
|
|
def setUp(self) -> None:
|
|
if not core_probe.sandbox_argv([])[0]:
|
|
self.skipTest("no working bwrap on this host")
|
|
self.tmp = Path(tempfile.mkdtemp(dir=REPO_ROOT / "tmp" / "tests"))
|
|
self.addCleanup(shutil.rmtree, self.tmp, True)
|
|
self.out = self.tmp / "out"
|
|
self.inputs = self.tmp / "inputs"
|
|
self.inputs.mkdir()
|
|
(self.inputs / "bios.bin").write_text("BIOS")
|
|
self.elsewhere = self.tmp / "elsewhere"
|
|
self.elsewhere.mkdir()
|
|
|
|
def inside(self, script: str, **kwargs: object) -> subprocess.CompletedProcess:
|
|
prefix, isolation = core_probe.sandbox_argv([self.out], [self.inputs], **kwargs)
|
|
self.assertEqual(isolation, core_probe.SANDBOX)
|
|
return subprocess.run(prefix + ["/bin/sh", "-c", script], capture_output=True, text=True,
|
|
check=False, env={"PATH": "/usr/bin:/bin"})
|
|
|
|
def test_nothing_of_the_user_or_the_checkout_is_reachable(self) -> None:
|
|
home = Path.home()
|
|
hidden = [home / ".config", home / ".ssh", home / ".git-credentials", home / ".netrc",
|
|
home / ".gitconfig", REPO_ROOT / ".git", REPO_ROOT / "scripts", REPO_ROOT / "bios",
|
|
REPO_ROOT / "emulators", self.elsewhere,
|
|
Path("/mnt/c"), Path("/root"), Path("/var"), Path("/etc/shadow"), Path("/opt")]
|
|
script = "; ".join(f'test -e "{path}" && echo "LEAK {path}"' for path in hidden)
|
|
# The checkout exists only as the path down to the bound folders.
|
|
script += f'; ls -A /mnt /tmp; ls -A ~ 2>/dev/null; ls -A "{REPO_ROOT}"; echo end'
|
|
proc = self.inside(script)
|
|
self.assertNotIn("LEAK", proc.stdout)
|
|
self.assertEqual(proc.stdout.split(), ["/mnt:", "/tmp:", "tmp", "end"])
|
|
|
|
def test_inputs_read_only_work_dir_writable(self) -> None:
|
|
proc = self.inside(f'cat "{self.inputs}/bios.bin"; echo; echo x > "{self.inputs}/bios.bin" 2>/dev/null '
|
|
f'|| echo refused; echo ok > "{self.out}/w"; echo no > "{self.elsewhere}/w" '
|
|
f'2>/dev/null || echo gone')
|
|
self.assertEqual(proc.stdout.split(), ["BIOS", "refused", "gone"])
|
|
self.assertEqual((self.inputs / "bios.bin").read_text(), "BIOS")
|
|
self.assertEqual((self.out / "w").read_text(), "ok\n")
|
|
self.assertFalse((self.elsewhere / "w").exists())
|
|
|
|
def test_no_network_unless_asked(self) -> None:
|
|
devices = "tail -n +3 /proc/net/dev | cut -d: -f1"
|
|
self.assertEqual(self.inside(devices).stdout.split(), ["lo"])
|
|
self.assertNotEqual(self.inside(devices, network=True).stdout.split(), ["lo"])
|
|
|
|
def test_a_probe_can_require_the_sandbox(self) -> None:
|
|
args = core_probe.build_parser().parse_args(
|
|
["run", "--core", sys.executable, "--require-sandbox"])
|
|
self.assertEqual([p for p in core_probe.validate_args(args) if "sandbox" in p], [])
|
|
with unittest.mock.patch.object(core_probe.shutil, "which", return_value=None):
|
|
problems = core_probe.validate_args(args)
|
|
self.assertIn("--require-sandbox: environment only: bwrap not found", problems)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main()
|