115 lines
6.0 KiB
Python
115 lines
6.0 KiB
Python
#!/usr/bin/env python3
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"""Build the matching Darwin 23 pthread kernel component and its real registration."""
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import json
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from pathlib import Path
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import struct
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import subprocess
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ROOT = Path(__file__).resolve().parents[1]
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SOURCE = ROOT / 'refer/libpthread'
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REVISION = 'c0e60fb5ecfc54cf379c261d3f9572cc22ded891'
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if subprocess.check_output(['git', '-C', SOURCE, 'rev-parse', 'HEAD'], text=True).strip() != REVISION:
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raise SystemExit('Unexpected libpthread source revision')
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if subprocess.check_output(['git', '-C', SOURCE, 'status', '--porcelain'], text=True):
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raise SystemExit('The libpthread reference must remain immutable')
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WORK = ROOT / '.cache/libpthread-work'
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if not WORK.exists():
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subprocess.run(['git', 'clone', '--shared', SOURCE, WORK], check=True)
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for patch in sorted((ROOT / 'patches/libpthread').glob('*.patch')):
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if subprocess.run(['git', '-C', WORK, 'apply', '--reverse', '--check', patch],
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stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL).returncode:
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subprocess.run(['git', '-C', WORK, 'apply', patch], check=True)
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SOURCE = WORK
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OUT = ROOT / 'build/libpthread-kernel'
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OUT.mkdir(parents=True, exist_ok=True)
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recipe = ROOT / 'build/xnu/ios-obj/DEVELOPMENT_ARM64_BCM2837/osfmk/DEVELOPMENT/prng_random.o.json'
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record = json.loads(recipe.read_text().strip().rstrip(','))
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sdk = subprocess.check_output(['xcrun', '--sdk', 'iphoneos', '--show-sdk-path'], text=True).strip()
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def compile_one(source, destination, namespace=None):
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if source.name == 'source_pthread_bootstrap.c':
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command = []
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arguments = record['arguments']
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index = 0
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while index < len(arguments):
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value = arguments[index]
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if value == record['file']:
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command.append(str(source))
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elif value == '-o':
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command.extend(['-o', str(destination)])
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index += 1
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else:
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command.append(value)
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index += 1
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else:
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framework = ROOT / '.cache/fakeroot/System/Library/Frameworks/Kernel.framework/Versions/A'
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command = ['xcrun', '--sdk', 'iphoneos', 'clang', '-target', 'arm64-apple-ios17.0',
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'-isysroot', sdk, '-mkernel', '-ffreestanding', '-fno-builtin', '-fno-stack-check',
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'-std=gnu11', '-fblocks', '-O2', '-mno-implicit-float',
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'-DKERNEL=1', '-DKERNEL_PRIVATE=1', '-DXNU_KERNEL_PRIVATE=1',
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'-DMACH_KERNEL_PRIVATE=1', '-DMACH_ASSERT=1', '-DDEBUG=1',
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'-D__PTHREAD_EXPOSE_INTERNALS__=1', '-DABSOLUTETIME_SCALAR_TYPE=1', '-DNEEDS_SCHED_CALL_T=1',
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'-I', str(SOURCE / 'private'), '-I', str(SOURCE / 'include'), '-I', str(SOURCE),
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'-I', str(framework / 'PrivateHeaders'), '-I', str(framework / 'Headers'),
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'-Wno-deprecated-declarations', '-c', str(source), '-o', str(destination)]
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if namespace:
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command += ['-include', str(namespace)]
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result = subprocess.run(command, cwd=record['directory'], stdout=subprocess.PIPE, stderr=subprocess.STDOUT, text=True)
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destination.with_suffix('.log').write_text(result.stdout)
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if result.returncode:
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raise SystemExit(result.stdout[-4500:])
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data = destination.read_bytes()
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if struct.unpack_from('<4I', data) != (0xfeedfacf, 0x100000c, 0, 1):
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raise SystemExit('Unexpected pthread object architecture')
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offset = 32
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deployment = None
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for _ in range(struct.unpack_from('<I', data, 16)[0]):
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cmd, length = struct.unpack_from('<II', data, offset)
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if cmd == 0x32:
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deployment = struct.unpack_from('<II', data, offset + 8)
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offset += length
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if deployment != (2, 0x110000):
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raise SystemExit(f'Unexpected pthread deployment: {deployment}')
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def names(path, mode, global_only=True):
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result = subprocess.check_output(['xcrun', 'nm', *(['-g'] if global_only else []), mode, '-j', path], text=True)
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return {line.strip() for line in result.splitlines() if line.startswith('_')}
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sources = [SOURCE / 'kern' / name for name in ('kern_init.c', 'kern_support.c', 'kern_synch.c')]
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objects = []
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for source in sources:
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destination = OUT / (source.stem + '.o')
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compile_one(source, destination)
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objects.append(destination)
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kernel = ROOT / 'build/xnu/checkpoints/native-4k-user-abi/kernel.macho'
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kernel_names = names(kernel, '-U', global_only=False)
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definitions = set().union(*(names(path, '-U') for path in objects))
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collisions = definitions & kernel_names
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if collisions:
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namespace = OUT / 'namespace.h'
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namespace.write_text(''.join(f'#define {name[1:]} pthread519_{name[1:]}\n' for name in sorted(collisions)))
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for source, destination in zip(sources, objects):
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compile_one(source, destination, namespace)
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definitions = set().union(*(names(path, '-U') for path in objects))
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imports = set().union(*(names(path, '-u') for path in objects)) - definitions
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# The component is statically linked: os_log's DSO identity is the real
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# executable Mach-O header, synthesized by the Mach-O executable linker.
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missing = sorted(imports - kernel_names - {'___dso_handle'})
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report = {'revision': REVISION, 'sources': 3, 'ordinary_arm64_ios17_audited': True,
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'namespace_collisions_isolated': sorted(collisions), 'missing_kernel_names': missing,
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'linker_synthesized_symbols': ['___dso_handle'],
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'registration_observed': False}
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(OUT / 'report.json').write_text(json.dumps(report, indent=2) + '\n')
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if not {'_pthread_kern', '_current_uthread'} <= collisions:
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raise SystemExit('Missing expected pthread/XNU static symbol isolation')
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if missing:
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raise SystemExit(f'Unavailable real kernel imports: {missing}')
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archive = OUT / 'libpthread_kernel.a'
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archive.unlink(missing_ok=True)
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compile_one(ROOT / '.cache/xnu-work/bsd/kern/source_pthread_bootstrap.c', OUT / 'source_pthread_bootstrap.o')
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subprocess.run(['xcrun', 'ar', 'rcs', archive, *objects, OUT / 'source_pthread_bootstrap.o'], check=True)
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print('Matching libpthread: 3 real C sources + bootstrap, ARM64/iOS 17 audit, no unavailable kernel names')
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