163 lines
6 KiB
Python
Executable file
163 lines
6 KiB
Python
Executable file
#!/usr/bin/env python3
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# Copyright (c) 2014 Wladimir J. van der Laan
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or http://www.opensource.org/licenses/mit-license.php.
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'''
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A script to check that the (Linux) executables produced by gitian only contain
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allowed gcc, glibc and libstdc++ version symbols. This makes sure they are
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still compatible with the minimum supported Linux distribution versions.
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Example usage:
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find ../gitian-builder/build -type f -executable | xargs python contrib/devtools/symbol-check.py
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'''
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import subprocess
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import re
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import sys
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import os
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# Debian 6.0.9 (Squeeze) has:
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#
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# - g++ version 4.4.5 (https://packages.debian.org/search?suite=default§ion=all&arch=any&searchon=names&keywords=g%2B%2B)
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# - libc version 2.11.3 (https://packages.debian.org/search?suite=default§ion=all&arch=any&searchon=names&keywords=libc6)
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# - libstdc++ version 4.4.5 (https://packages.debian.org/search?suite=default§ion=all&arch=any&searchon=names&keywords=libstdc%2B%2B6)
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#
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# Ubuntu 10.04.4 (Lucid Lynx) has:
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#
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# - g++ version 4.4.3 (http://packages.ubuntu.com/search?keywords=g%2B%2B&searchon=names&suite=lucid§ion=all)
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# - libc version 2.11.1 (http://packages.ubuntu.com/search?keywords=libc6&searchon=names&suite=lucid§ion=all)
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# - libstdc++ version 4.4.3 (http://packages.ubuntu.com/search?suite=lucid§ion=all&arch=any&keywords=libstdc%2B%2B&searchon=names)
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#
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# Taking the minimum of these as our target.
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#
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# According to GNU ABI document (http://gcc.gnu.org/onlinedocs/libstdc++/manual/abi.html) this corresponds to:
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# GCC 4.4.0: GCC_4.4.0
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# GCC 4.4.2: GLIBCXX_3.4.13, CXXABI_1.3.3
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# (glibc) GLIBC_2_11
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#
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MAX_VERSIONS = {
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'GCC': (4,4,0),
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'CXXABI': (1,3,3),
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'GLIBCXX': (3,4,13),
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'GLIBC': (2,11)
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}
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# See here for a description of _IO_stdin_used:
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# https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=634261#109
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# Ignore symbols that are exported as part of every executable
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IGNORE_EXPORTS = {
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b'_edata', b'_end', b'_init', b'__bss_start', b'_fini', b'_IO_stdin_used'
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}
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READELF_CMD = os.getenv('READELF', '/usr/bin/readelf')
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CPPFILT_CMD = os.getenv('CPPFILT', '/usr/bin/c++filt')
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# Allowed NEEDED libraries
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ALLOWED_LIBRARIES = {
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# bitcoind and bitcoin-qt
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b'libgcc_s.so.1', # GCC base support
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b'libc.so.6', # C library
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b'libpthread.so.0', # threading
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b'libanl.so.1', # DNS resolve
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b'libm.so.6', # math library
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b'librt.so.1', # real-time (clock)
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b'ld-linux-x86-64.so.2', # 64-bit dynamic linker
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b'ld-linux.so.2', # 32-bit dynamic linker
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# bitcoin-qt only
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b'libX11-xcb.so.1', # part of X11
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b'libX11.so.6', # part of X11
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b'libxcb.so.1', # part of X11
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b'libfontconfig.so.1', # font support
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b'libfreetype.so.6', # font parsing
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b'libdl.so.2' # programming interface to dynamic linker
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}
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class CPPFilt(object):
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'''
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Demangle C++ symbol names.
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Use a pipe to the 'c++filt' command.
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'''
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def __init__(self):
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self.proc = subprocess.Popen(CPPFILT_CMD, stdin=subprocess.PIPE, stdout=subprocess.PIPE)
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def __call__(self, mangled):
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self.proc.stdin.write(mangled + b'\n')
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self.proc.stdin.flush()
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return self.proc.stdout.readline().rstrip()
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def close(self):
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self.proc.stdin.close()
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self.proc.stdout.close()
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self.proc.wait()
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def read_symbols(executable, imports=True):
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'''
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Parse an ELF executable and return a list of (symbol,version) tuples
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for dynamic, imported symbols.
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'''
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p = subprocess.Popen([READELF_CMD, '--dyn-syms', '-W', executable], stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE)
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(stdout, stderr) = p.communicate()
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if p.returncode:
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raise IOError('Could not read symbols for %s: %s' % (executable, stderr.strip()))
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syms = []
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for line in stdout.split(b'\n'):
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line = line.split()
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if len(line)>7 and re.match(b'[0-9]+:$', line[0]):
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(sym, _, version) = line[7].partition(b'@')
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is_import = line[6] == b'UND'
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if version.startswith(b'@'):
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version = version[1:]
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if is_import == imports:
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syms.append((sym, version))
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return syms
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def check_version(max_versions, version):
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if b'_' in version:
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(lib, _, ver) = version.rpartition(b'_')
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else:
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lib = version
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ver = '0'
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ver = tuple([int(x) for x in ver.split(b'.')])
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if not lib in max_versions:
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return False
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return ver <= max_versions[lib]
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def read_libraries(filename):
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p = subprocess.Popen([READELF_CMD, '-d', '-W', filename], stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE)
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(stdout, stderr) = p.communicate()
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if p.returncode:
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raise IOError('Error opening file')
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libraries = []
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for line in stdout.split(b'\n'):
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tokens = line.split()
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if len(tokens)>2 and tokens[1] == b'(NEEDED)':
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match = re.match(b'^Shared library: \[(.*)\]$', b' '.join(tokens[2:]))
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if match:
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libraries.append(match.group(1))
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else:
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raise ValueError('Unparseable (NEEDED) specification')
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return libraries
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if __name__ == '__main__':
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cppfilt = CPPFilt()
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retval = 0
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for filename in sys.argv[1:]:
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# Check imported symbols
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for sym,version in read_symbols(filename, True):
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if version and not check_version(MAX_VERSIONS, version):
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print('%s: symbol %s from unsupported version %s' % (filename, cppfilt(sym).decode('utf-8'), version.decode('utf-8')))
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retval = 1
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# Check exported symbols
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for sym,version in read_symbols(filename, False):
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if sym in IGNORE_EXPORTS:
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continue
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print('%s: export of symbol %s not allowed' % (filename, cppfilt(sym).decode('utf-8')))
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retval = 1
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# Check dependency libraries
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for library_name in read_libraries(filename):
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if library_name not in ALLOWED_LIBRARIES:
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print('%s: NEEDED library %s is not allowed' % (filename, library_name.decode('utf-8')))
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retval = 1
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sys.exit(retval)
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