164 lines
6.0 KiB
164 lines
6.0 KiB
#!/usr/bin/python2 |
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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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from __future__ import division, print_function, unicode_literals |
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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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exit(retval) |
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