# Copyright 2018 The Chromium OS Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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import os
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import subprocess
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from whitelist import is_whitelisted
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def check_debug_info(dso_path, readelf_content):
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"""check whether debug info section exists in the elf file.
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Args:
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readelf: debug info dumped by command readelf
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Returns:
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True if debug info section exists, otherwise False.
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"""
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# Return True if it is whitelisted
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if is_whitelisted('exist_debug_info', dso_path):
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return True
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for l in readelf_content:
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if 'debug_info' in l:
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return True
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return False
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def check_producer(dso_path, readelf_content):
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"""check whether DW_AT_producer exists in each compile unit.
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Args:
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readelf: debug info dumped by command readelf
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Returns:
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True if DW_AT_producer exists in each compile unit, otherwise False.
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Notice: If no compile unit in DSO, also return True.
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"""
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# Return True if it is whitelisted
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if is_whitelisted('exist_producer', dso_path):
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return True
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# Indicate if there is a producer under each cu
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cur_producer = False
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first_cu = True
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producer_exist = True
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for l in readelf_content:
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if 'DW_TAG_compile_unit' in l:
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if not first_cu and not cur_producer:
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producer_exist = False
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break
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first_cu = False
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cur_producer = False
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elif 'DW_AT_producer' in l:
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cur_producer = True
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# Check whether last producer of compile unit exists in the elf,
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# also return True if no cu in the DSO.
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if not first_cu and not cur_producer:
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producer_exist = False
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return producer_exist
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def check_exist_all(dso_path):
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"""check whether intended components exists in the given dso.
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Args:
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dso_path: path to the dso
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Return:
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True if everything looks fine otherwise False.
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"""
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readelf = subprocess.Popen(['readelf', '--debug-dump=info',
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'--dwarf-depth=1', dso_path],
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stdout=subprocess.PIPE,
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stderr=open(os.devnull, 'w'))
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readelf_content = list(readelf.stdout)
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exist_checks = [check_debug_info, check_producer]
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for e in exist_checks:
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if not e(dso_path, readelf_content):
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check_failed = e.__module__ + ': ' + e.__name__
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print('%s failed check: %s' % (dso_path, check_failed))
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return False
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return True
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