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9b2a119dc6
This warning triggers reliably on most binaries and on android, spams the logcat which may obfuscate other errors. The actual amount varies, but is typically 40 bytes for 32-bit android system libraries, 80 bytes for 64-bit android system libraries, 64 bytes for linux system libraries (on my machine), but so far they're all zeroes. Change-Id: I658434e8290c75641a3b17034ebdd958834bcd69 Reviewed-on: https://chromium-review.googlesource.com/c/1269740 Reviewed-by: Mark Mentovai <mark@chromium.org> Commit-Queue: Joshua Peraza <jperaza@chromium.org>
81 lines
2.5 KiB
C++
81 lines
2.5 KiB
C++
// Copyright 2017 The Crashpad Authors. All rights reserved.
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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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#include "snapshot/elf/elf_dynamic_array_reader.h"
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#include <elf.h>
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#include <type_traits>
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#include "util/stdlib/map_insert.h"
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namespace crashpad {
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namespace {
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template <typename DynType>
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bool Read(const ProcessMemoryRange& memory,
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VMAddress address,
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VMSize size,
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std::map<uint64_t, uint64_t>* values) {
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std::map<uint64_t, uint64_t> local_values;
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while (size > 0) {
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DynType entry;
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if (!memory.Read(address, sizeof(entry), &entry)) {
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return false;
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}
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size -= sizeof(entry);
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address += sizeof(entry);
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switch (entry.d_tag) {
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case DT_NULL:
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values->swap(local_values);
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return true;
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case DT_NEEDED:
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// Skip these entries for now.
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break;
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default:
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static_assert(std::is_unsigned<decltype(entry.d_un.d_ptr)>::value,
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"type must be unsigned");
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static_assert(static_cast<void*>(&entry.d_un.d_ptr) ==
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static_cast<void*>(&entry.d_un.d_val) &&
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sizeof(entry.d_un.d_ptr) == sizeof(entry.d_un.d_val),
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"d_ptr and d_val must be aliases");
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if (!MapInsertOrReplace(
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&local_values, entry.d_tag, entry.d_un.d_ptr, nullptr)) {
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LOG(ERROR) << "duplicate dynamic array entry";
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return false;
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}
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}
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}
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LOG(ERROR) << "missing DT_NULL";
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return false;
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}
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} // namespace
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ElfDynamicArrayReader::ElfDynamicArrayReader() : values_() {}
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ElfDynamicArrayReader::~ElfDynamicArrayReader() {}
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bool ElfDynamicArrayReader::Initialize(const ProcessMemoryRange& memory,
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VMAddress address,
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VMSize size) {
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return memory.Is64Bit() ? Read<Elf64_Dyn>(memory, address, size, &values_)
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: Read<Elf32_Dyn>(memory, address, size, &values_);
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}
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} // namespace crashpad
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