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# -*- coding: utf-8 -*-
# Copyright 2018 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""check whether intended components exists in the given dso."""
from __future__ import print_function
import os
import subprocess
from allowlist import is_allowlisted
def check_debug_info(dso_path, readelf_content):
"""Check whether debug info section exists in the elf file.
Args:
dso_path: path to the dso.
readelf_content: debug info dumped by command readelf.
Returns:
True if debug info section exists, otherwise False.
"""
# Return True if it is allowlisted
if is_allowlisted('exist_debug_info', dso_path):
return True
for l in readelf_content:
if 'debug_info' in l:
return True
return False
def check_producer(dso_path, readelf_content):
"""Check whether DW_AT_producer exists in each compile unit.
Args:
dso_path: path to the dso.
readelf_content: debug info dumped by command readelf.
Returns:
True if DW_AT_producer exists in each compile unit, otherwise False.
Notice: If no compile unit in DSO, also return True.
"""
# Return True if it is allowlisted
if is_allowlisted('exist_producer', dso_path):
return True
# Indicate if there is a producer under each cu
cur_producer = False
first_cu = True
producer_exist = True
for l in readelf_content:
if 'DW_TAG_compile_unit' in l:
if not first_cu and not cur_producer:
producer_exist = False
break
first_cu = False
cur_producer = False
elif 'DW_AT_producer' in l:
cur_producer = True
# Check whether last producer of compile unit exists in the elf,
# also return True if no cu in the DSO.
if not first_cu and not cur_producer:
producer_exist = False
return producer_exist
def check_exist_all(dso_path):
"""check whether intended components exists in the given dso.
Args:
dso_path: path to the dso.
Returns:
True if everything looks fine otherwise False.
"""
readelf = subprocess.Popen(
['readelf', '--debug-dump=info', '--dwarf-depth=1', dso_path],
stdout=subprocess.PIPE,
stderr=open(os.devnull, 'w'),
encoding='utf-8')
readelf_content = list(readelf.stdout)
exist_checks = [check_debug_info, check_producer]
for e in exist_checks:
if not e(dso_path, readelf_content):
check_failed = e.__module__ + ': ' + e.__name__
print('%s failed check: %s' % (dso_path, check_failed))
return False
return True
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