120 lines
4.2 KiB
Python
Executable File
120 lines
4.2 KiB
Python
Executable File
#!/usr/bin/python
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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
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import subprocess
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import re
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import sys
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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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# Ignore symbols that are exported as part of every executable
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IGNORE_EXPORTS = {
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'_edata', '_end', '_init', '__bss_start', '_fini'
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}
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READELF_CMD = '/usr/bin/readelf'
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CPPFILT_CMD = '/usr/bin/c++filt'
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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 + '\n')
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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('\n'):
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line = line.split()
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if len(line)>7 and re.match('[0-9]+:$', line[0]):
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(sym, _, version) = line[7].partition('@')
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is_import = line[6] == 'UND'
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if version.startswith('@'):
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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 '_' in version:
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(lib, _, ver) = version.rpartition('_')
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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('.')])
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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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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), version))
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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)))
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retval = 1
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exit(retval)
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