mirror of https://github.com/google/oss-fuzz.git
283 lines
8.8 KiB
Python
Executable File
283 lines
8.8 KiB
Python
Executable File
#!/usr/bin/env python
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# Copyright 2017 Google Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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################################################################################
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from __future__ import print_function
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import argparse
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import imp
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import os
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import shutil
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import subprocess
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import tempfile
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from packages import package
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SCRIPT_DIR = os.path.dirname(os.path.realpath(__file__))
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PACKAGES_DIR = os.path.join(SCRIPT_DIR, 'packages')
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INJECTED_ARGS = [
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'-fsanitize=memory',
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'-fsanitize-memory-track-origins=2',
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'-fsanitize-recover=memory',
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'-fPIC',
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'-fno-omit-frame-pointer',
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]
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class MSanBuildException(Exception):
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"""Base exception."""
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def SetUpEnvironment(work_dir):
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"""Set up build environment."""
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env = {}
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env['REAL_CLANG_PATH'] = subprocess.check_output(['which', 'clang']).strip()
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print('Real clang at', env['REAL_CLANG_PATH'])
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compiler_wrapper_path = os.path.join(SCRIPT_DIR, 'compiler_wrapper.py')
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# Symlink binaries into TMP/bin
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bin_dir = os.path.join(work_dir, 'bin')
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os.mkdir(bin_dir)
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os.symlink(compiler_wrapper_path,
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os.path.join(bin_dir, 'clang'))
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os.symlink(compiler_wrapper_path,
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os.path.join(bin_dir, 'clang++'))
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env['CC'] = os.path.join(bin_dir, 'clang')
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env['CXX'] = os.path.join(bin_dir, 'clang++')
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# Not all build rules respect $CC/$CXX, so make additional symlinks.
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dpkg_host_architecture = subprocess.check_output(
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['dpkg-architecture', '-qDEB_HOST_GNU_TYPE']).strip()
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os.symlink(compiler_wrapper_path,
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os.path.join(bin_dir, dpkg_host_architecture + '-gcc'))
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os.symlink(compiler_wrapper_path,
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os.path.join(bin_dir, dpkg_host_architecture + '-g++'))
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os.symlink(compiler_wrapper_path, os.path.join(bin_dir, 'gcc'))
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os.symlink(compiler_wrapper_path, os.path.join(bin_dir, 'cc'))
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os.symlink(compiler_wrapper_path, os.path.join(bin_dir, 'g++'))
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os.symlink(compiler_wrapper_path, os.path.join(bin_dir, 'c++'))
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MSAN_OPTIONS = ' '.join(INJECTED_ARGS)
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env['DEB_BUILD_OPTIONS'] = 'nocheck nostrip'
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env['DEB_CFLAGS_APPEND'] = MSAN_OPTIONS
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env['DEB_CXXFLAGS_APPEND'] = MSAN_OPTIONS + ' -stdlib=libc++'
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env['DEB_CPPFLAGS_APPEND'] = env['DEB_CXXFLAGS_APPEND']
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env['DEB_LDFLAGS_APPEND'] = MSAN_OPTIONS
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env['DPKG_GENSYMBOLS_CHECK_LEVEL'] = '0'
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# debian/rules can set DPKG_GENSYMBOLS_CHECK_LEVEL explicitly, so override it.
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dpkg_gensymbols_path = os.path.join(bin_dir, 'dpkg-gensymbols')
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with open(dpkg_gensymbols_path, 'w') as f:
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f.write(
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'#!/bin/sh\n'
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'export DPKG_GENSYMBOLS_CHECK_LEVEL=0\n'
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'/usr/bin/dpkg-gensymbols "$@"\n')
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os.chmod(dpkg_gensymbols_path, 0755)
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env['PATH'] = bin_dir + ':' + os.environ['PATH']
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# Prevent entire build from failing because of bugs/uninstrumented in tools
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# that are part of the build.
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# TODO(ochang): Figure out some way to suppress reports since they can still
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# be very noisy.
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env['MSAN_OPTIONS'] = 'halt_on_error=0:exitcode=0'
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return env
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def FindPackageDebs(package_name, work_directory):
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"""Find package debs."""
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deb_paths = []
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for filename in os.listdir(work_directory):
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file_path = os.path.join(work_directory, filename)
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if not file_path.endswith('.deb'):
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continue
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if filename.startswith(package_name + '_'):
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deb_paths.append(file_path)
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return deb_paths
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def ExtractSharedLibraries(deb_paths, work_directory, output_directory):
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"""Extract shared libraries from .deb packages."""
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extract_directory = os.path.join(work_directory, 'extracted')
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if os.path.exists(extract_directory):
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shutil.rmtree(extract_directory, ignore_errors=True)
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os.mkdir(extract_directory)
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for deb_path in deb_paths:
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subprocess.check_call(['dpkg-deb', '-x', deb_path, extract_directory])
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extracted = []
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for root, _, filenames in os.walk(extract_directory):
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if 'libx32' in root or 'lib32' in root:
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continue
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for filename in filenames:
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if not filename.endswith('.so') and '.so.' not in filename:
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continue
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file_path = os.path.join(root, filename)
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rel_file_path = os.path.relpath(file_path, extract_directory)
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rel_directory = os.path.dirname(rel_file_path)
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target_dir = os.path.join(output_directory, rel_directory)
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if not os.path.exists(target_dir):
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os.makedirs(target_dir)
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target_file_path = os.path.join(output_directory, rel_file_path)
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extracted.append(target_file_path)
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if os.path.islink(file_path):
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link_path = os.readlink(file_path)
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if os.path.isabs(link_path):
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# Make absolute links relative.
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link_path = os.path.relpath(
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link_path, os.path.join('/', rel_directory))
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os.symlink(link_path, target_file_path)
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else:
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shutil.copy2(file_path, target_file_path)
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return extracted
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def GetPackage(package_name):
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custom_package_path = os.path.join(PACKAGES_DIR, package_name) + '.py'
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if not os.path.exists(custom_package_path):
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print('Using default package build steps.')
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return package.Package(package_name)
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print('Using custom package build steps.')
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module = imp.load_source('packages.' + package_name, custom_package_path)
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return module.Package()
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def PatchRpath(path, output_directory):
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"""Patch rpath to be relative to $ORIGIN."""
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try:
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rpaths = subprocess.check_output(
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['patchelf', '--print-rpath', path]).strip()
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except subprocess.CalledProcessError:
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return
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if not rpaths:
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return
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processed_rpath = []
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rel_directory = os.path.join(
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'/', os.path.dirname(os.path.relpath(path, output_directory)))
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for rpath in rpaths.split(':'):
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if '$ORIGIN' in rpath:
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# Already relative.
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processed_rpath.append(rpath)
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continue
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processed_rpath.append(os.path.join(
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'$ORIGIN',
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os.path.relpath(rpath, rel_directory)))
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processed_rpath = ':'.join(processed_rpath)
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print('Patching rpath for', path, 'to', processed_rpath)
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subprocess.check_call(
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['patchelf', '--force-rpath', '--set-rpath',
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processed_rpath, path])
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class MSanBuilder(object):
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"""MSan builder."""
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def __init__(self, debug=False, log_path=None, work_dir=None):
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self.debug = debug
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self.log_path = log_path
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self.work_dir = work_dir
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self.env = None
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def __enter__(self):
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if not self.work_dir:
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self.work_dir = tempfile.mkdtemp(dir=self.work_dir)
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if os.path.exists(self.work_dir):
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shutil.rmtree(self.work_dir, ignore_errors=True)
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os.makedirs(self.work_dir)
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self.env = SetUpEnvironment(self.work_dir)
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if self.debug and self.log_path:
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self.env['WRAPPER_DEBUG_LOG_PATH'] = self.log_path
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return self
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def __exit__(self, exc_type, exc_value, traceback):
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if not self.debug:
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shutil.rmtree(self.work_dir, ignore_errors=True)
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def Build(self, package_name, output_directory):
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"""Build the package and write results into the output directory."""
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deb_paths = FindPackageDebs(package_name, self.work_dir)
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if deb_paths:
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print('Source package already built for', package_name)
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else:
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pkg = GetPackage(package_name)
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pkg.InstallBuildDeps()
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source_directory = pkg.DownloadSource(self.work_dir)
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print('Source downloaded to', source_directory)
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pkg.Build(source_directory, self.env)
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deb_paths = FindPackageDebs(package_name, self.work_dir)
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if not deb_paths:
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raise MSanBuildException('Failed to find .deb packages.')
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extracted_paths = ExtractSharedLibraries(deb_paths, self.work_dir,
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output_directory)
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for extracted_path in extracted_paths:
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if not os.path.islink(extracted_path):
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PatchRpath(extracted_path, output_directory)
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def main():
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parser = argparse.ArgumentParser('msan_build.py', description='MSan builder.')
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parser.add_argument('package_names', nargs='+', help='Name of the packages.')
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parser.add_argument('output_dir', help='Output directory.')
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parser.add_argument('--debug', action='store_true', help='Enable debug mode.')
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parser.add_argument('--log-path', help='Log path for debugging.')
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parser.add_argument('--work-dir', help='Work directory.')
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args = parser.parse_args()
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if not os.path.exists(args.output_dir):
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os.makedirs(args.output_dir)
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with MSanBuilder(debug=args.debug, log_path=args.log_path,
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work_dir=args.work_dir) as builder:
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for package_name in args.package_names:
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builder.Build(package_name, args.output_dir)
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if __name__ == '__main__':
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main()
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