File size: 13,117 Bytes
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import os
import struct
import tempfile
import unittest
from pathlib import Path
from unittest.mock import patch
from lightnest.binary import (BinaryFormatError, BinaryReader, Limits, SLOT_MAGIC,
find_slots, index_elf, index_lnw1, inspect_binary, read_small_program)
def blob(shape=(2,), data=None):
name = b'weight'
header = b'LNW1' + struct.pack('<10I', 1, 8, 1, 2, 32, 32, 16, 16, 1, 1)
prefix = header + struct.pack('<I', 1) + b'a' + struct.pack('<I', len(name)) + name
prefix += struct.pack('<I', len(shape)) + struct.pack('<' + 'I' * len(shape), *shape)
count = 1
for d in shape:
count *= d
return prefix, data if data is not None else b'\0' * (4 * count)
class BinaryTests(unittest.TestCase):
def setUp(self):
self.tmp = tempfile.TemporaryDirectory()
self.path = Path(self.tmp.name) / 'input'
def tearDown(self):
self.tmp.cleanup()
def write(self, data):
self.path.write_bytes(data)
def test_range_and_chunk_guards(self):
self.write(bytes(range(100)))
with BinaryReader(self.path, max_read=16) as r:
for off, size in ((-1, 1), (100, 1), (0, 17), (1, -1)):
with self.assertRaises(BinaryFormatError):
r.read_at(off, size)
self.assertEqual(b''.join(r.iter_chunks(10, 20, chunk_size=3)), bytes(range(10, 30)))
with self.assertRaises(ValueError):
list(r.iter_chunks(chunk_size=0))
self.assertEqual(r.sha256(), hashlib.sha256(bytes(range(100))).hexdigest())
def test_magic_cross_boundary_and_overlaps(self):
self.write(b'xxxxxxMAGICaaaaaMAGICaaa')
with BinaryReader(self.path, max_read=8) as r:
self.assertEqual(list(r.find_magic(b'MAGIC')), [6, 16])
self.assertEqual(list(r.find_magic(b'aaa')), [11, 12, 13, 21])
with self.assertRaises(BinaryFormatError):
list(r.find_magic(b'aaa', max_matches=1))
self.assertEqual(list(r.find_magic(b'MAGIC', 7, 13)), [])
def test_sparse_gigabyte_tensor_never_read(self):
# 4 GiB sparse payload: actual allocated storage stays tiny.
prefix, _ = blob((1,), b'')
prefix = prefix[:-4] + struct.pack('<I', 1 << 30)
with self.path.open('wb') as f:
f.write(prefix)
f.truncate(len(prefix) + (1 << 32))
real = os.pread
observed = []
def guarded(fd, n, offset):
observed.append((offset, n))
self.assertLessEqual(n, 32)
self.assertLess(offset, len(prefix))
return real(fd, n, offset)
with BinaryReader(self.path, max_read=32) as r, patch('os.pread', guarded):
info = index_lnw1(r)
self.assertEqual(info['tensors'][0]['nbytes'], 1 << 32)
self.assertEqual(info['end_offset'], self.path.stat().st_size)
self.assertLess(sum(n for _, n in observed), 100)
def test_lnw1_embedded_offsets(self):
prefix, data = blob()
self.write(b'prefix' + prefix + data + b'suffix')
with BinaryReader(self.path) as r:
info = index_lnw1(r, 6, end=6+len(prefix)+len(data))
self.assertEqual(info['tensors'][0]['shape'], [2])
self.assertEqual(info['tensors'][0]['data_offset'], 6+len(prefix))
self.assertEqual(info['architecture']['heads'], 2)
def test_truncated_every_metadata_boundary(self):
prefix, data = blob()
for length in range(len(prefix) + len(data)):
self.write((prefix + data)[:length])
with BinaryReader(self.path) as r, self.assertRaises(BinaryFormatError):
index_lnw1(r)
def test_lnw1_guards(self):
prefix, data = blob()
cases = []
for offset, value in ((4, 2), (8, 0), (16, 3), (36, 100001), (40, 10001), (44, 4097)):
b = bytearray(prefix + data)
struct.pack_into('<I', b, offset, value)
cases.append(b)
cases.append(prefix[:-4] + struct.pack('<I', 0) + data)
cases.append(prefix[:48] + b'\xff' + prefix[49:] + data)
for value in cases:
self.write(value)
with BinaryReader(self.path) as r, self.assertRaises(BinaryFormatError):
index_lnw1(r)
self.write(prefix + data)
with BinaryReader(self.path) as r, self.assertRaises(BinaryFormatError):
index_lnw1(r, limits=Limits(max_metadata_bytes=20))
def test_nonregular_and_concurrent_truncate(self):
with self.assertRaises(BinaryFormatError):
BinaryReader(self.tmp.name)
fifo = Path(self.tmp.name) / 'fifo'
os.mkfifo(fifo)
with self.assertRaises(BinaryFormatError):
BinaryReader(fifo)
self.write(b'1234')
with BinaryReader(self.path) as r:
self.write(b'')
with self.assertRaises(BinaryFormatError):
r.read_at(0, 4)
def test_slots_bounded_and_ambiguous(self):
slot = SLOT_MAGIC + struct.pack('<II', 256, 4) + b'RV32\0'.ljust(16, b'\0') + bytes(256)
self.write(bytes(65530) + slot + slot)
with BinaryReader(self.path) as r:
slots = find_slots(r)
self.assertEqual([s['offset'] for s in slots], [65530, 65826])
self.assertEqual(slots[0]['data_offset'], 65570)
self.write(SLOT_MAGIC + struct.pack('<II', 255, 0) + bytes(272))
with BinaryReader(self.path) as r:
self.assertEqual(find_slots(r), [])
def test_unknown_and_explicit_raw(self):
self.write(b'\x73\x00\x10\x00')
self.assertEqual(inspect_binary(self.path)['format'], 'unknown')
self.assertEqual(inspect_binary(self.path, raw_arch='RV32')['architecture_source'], 'explicit hint')
self.write(b'abc')
with self.assertRaises(BinaryFormatError):
inspect_binary(self.path, raw_arch='RV32')
def test_streaming_sparse_hash_read_bounds(self):
with self.path.open('wb') as f:
f.truncate(2 * 1024 * 1024)
real = os.pread
sizes = []
def guarded(fd, size, offset):
sizes.append(size)
self.assertLessEqual(size, 1024)
return real(fd, size, offset)
with BinaryReader(self.path, max_read=1024) as r, patch('os.pread', guarded):
digest = r.sha256()
expected = hashlib.sha256()
for _ in range(2048):
expected.update(bytes(1024))
self.assertEqual(digest, expected.hexdigest())
self.assertEqual(len(sizes), 2048)
def test_elf32_big_endian_and_nobits(self):
ident = b'\x7fELF' + bytes([1, 2, 1]) + bytes(9)
header = ident + struct.pack('>HHIIIIIHHHHHH', 2, 243, 1, 0, 0, 52, 0, 52, 32, 0, 40, 1, 0)
section = struct.pack('>IIIIIIIIII', 0, 8, 3, 4096, 92, 1 << 30, 0, 0, 4, 0)
self.write(header + section)
with BinaryReader(self.path) as r:
info = index_elf(r)
self.assertEqual(info['bits'], 32)
self.assertEqual(info['byteorder'], 'big')
self.assertEqual(info['architecture'], 'riscv')
self.assertFalse(info['sections'][0]['file_backed'])
self.assertEqual(info['sections'][0]['nbytes'], 1 << 30)
def test_unknown_100gb_default_reads_only_magic(self):
with self.path.open('wb') as f:
f.truncate(100 * 1024**3)
real = os.pread
reads = []
def guarded(fd, n, offset):
reads.append((offset, n))
self.assertLessEqual(offset+n, 4)
return real(fd, n, offset)
with patch('os.pread', guarded):
info = inspect_binary(self.path)
self.assertEqual(reads, [(0, 4)])
self.assertEqual(info['weight_search']['scope'], 'not searched')
self.assertFalse(info['slot_search']['whole_file'])
def test_elf_huge_embedded_payload_prefix_budget(self):
prefix, _ = blob((1,), b'')
prefix = prefix[:-4] + struct.pack('<I', 1 << 30)
payload_size = len(prefix) + (1 << 32)
ident = b'\x7fELF' + bytes([2, 1, 1]) + bytes(9)
header = ident + struct.pack('<HHIQQQIHHHHHH', 2, 62, 1, 0, 0, 64, 0, 64, 56, 0, 64, 3, 1)
names = b'\0.shstrtab\0.rodata\0'
def section(name, kind, flags, offset, size):
return struct.pack('<IIQQQQIIQQ', name, kind, flags, 0, offset, size, 0, 0, 1, 0)
with self.path.open('wb') as f:
f.write(header + section(0, 0, 0, 0, 0) + section(1, 3, 0, 256, len(names))
+ section(11, 1, 2, 4096, payload_size) + names)
f.seek(4096)
f.write(prefix)
f.truncate(4096+payload_size)
real = os.pread
reads = []
def guarded(fd, n, offset):
reads.append((offset, n))
self.assertLess(offset, 4096+65536)
return real(fd, n, offset)
with patch('os.pread', guarded):
info = inspect_binary(self.path, scan_bytes=4096)
self.assertEqual(len(info['embedded_weights']), 1)
self.assertEqual(info['embedded_weights'][0]['tensors'][0]['nbytes'], 1 << 32)
self.assertEqual(info['weight_search']['search_bytes_read'], 4096)
self.assertFalse(info['weight_search']['whole_file'])
self.assertFalse(info['weight_search']['complete_within_selected_ranges'])
self.assertLess(sum(n for _, n in reads), 5000)
no_scan = inspect_binary(self.path, scan_bytes=0)
self.assertEqual(no_scan['embedded_weights'], [])
self.assertFalse(no_scan['weight_search']['complete_within_selected_ranges'])
def test_elf_direct_slot_lookup(self):
ident = b'\x7fELF' + bytes([2, 1, 1]) + bytes(9)
header = ident + struct.pack('<HHIQQQIHHHHHH', 2, 62, 1, 0, 0, 64, 0, 64, 56, 0, 64, 3, 1)
names = b'\0.shstrtab\0.lnself\0'
def section(name, kind, flags, offset, size):
return struct.pack('<IIQQQQIIQQ', name, kind, flags, 0, offset, size, 0, 0, 1, 0)
slot = SLOT_MAGIC + struct.pack('<II', 256, 4) + b'RV32\0'.ljust(16, b'\0') + bytes(256)
self.write(header + section(0, 0, 0, 0, 0) + section(1, 3, 0, 256, len(names))
+ section(11, 1, 3, 512, len(slot)) + names)
with self.path.open('r+b') as f:
f.seek(512)
f.write(slot)
info = inspect_binary(self.path, scan_bytes=0)
self.assertEqual(info['slots'][0]['offset'], 512)
self.assertEqual(info['slots'][0]['arch'], 'RV32')
self.assertEqual(info['weight_search']['search_bytes_read'], 0)
self.assertFalse(info['slot_search']['uniqueness_verified'])
def test_deep_scan_is_explicit(self):
prefix, payload = blob()
slot = SLOT_MAGIC + struct.pack('<II', 256, 0) + bytes(272)
self.write(b'unknown-prefix' + prefix + payload + slot)
fast = inspect_binary(self.path)
self.assertEqual(fast['slots'], [])
self.assertEqual(fast['embedded_weights'], [])
deep = inspect_binary(self.path, deep_scan=True)
self.assertEqual(len(deep['slots']), 1)
self.assertEqual(len(deep['embedded_weights']), 1)
self.assertTrue(deep['slot_search']['whole_file'])
self.assertTrue(deep['weight_search']['complete_within_selected_ranges'])
def test_small_program_limit_before_read(self):
self.write(b'\x73\x00\x10\x00')
self.assertEqual(read_small_program(self.path), self.path.read_bytes())
with self.path.open('wb') as f:
f.truncate(1 << 32)
with patch('os.pread', side_effect=AssertionError('oversized file payload read')):
with self.assertRaisesRegex(ValueError, 'inspect_binary'):
read_small_program(self.path)
for data in (b'', b'abc', b'\x7fELF', b'LNW1'):
self.write(data)
with self.assertRaisesRegex(ValueError, 'inspect_binary'):
read_small_program(self.path)
def test_minimal_elf_and_guards(self):
ident = b'\x7fELF' + bytes([2, 1, 1]) + bytes(9)
def header(**kw):
vals = dict(kind=2, machine=62, version=1, entry=0, phoff=0, shoff=0, flags=0,
ehsize=64, phsize=56, phnum=0, shsize=64, shnum=0, shstr=0)
vals.update(kw)
return ident + struct.pack('<HHIQQQIHHHHHH', *vals.values())
self.write(header())
with BinaryReader(self.path) as r:
self.assertEqual(index_elf(r)['architecture'], 'x86_64')
for bad in (header(phnum=1, phoff=64), header(phnum=65535), header(ehsize=1), header(shoff=64), header(phnum=8193)):
self.write(bad)
with BinaryReader(self.path) as r, self.assertRaises(BinaryFormatError):
index_elf(r)
segment = struct.pack('<IIQQQQQQ', 1, 5, 0, 0, 0, 120, 120, 4096)
self.write(header(phoff=64, phnum=1) + segment)
with BinaryReader(self.path) as r:
self.assertEqual(index_elf(r)['segments'][0]['nbytes'], 120)
if __name__ == '__main__':
unittest.main()
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