/* Copyright (C) 2017 The Android Open Source Project
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This file implements interfaces from the file jvmti.h. This implementation
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* is licensed under the same terms as the file jvmti.h. The
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* copyright and license information for the file jvmti.h follows.
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*
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* Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#include "base/leb128.h"
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#include "fixed_up_dex_file.h"
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#include "dex/class_accessor-inl.h"
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#include "dex/dex_file-inl.h"
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#include "dex/dex_file_loader.h"
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#include "dex/dex_file_verifier.h"
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// Runtime includes.
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#include "dex_container.h"
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#include "dex/compact_dex_level.h"
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#include "dex_to_dex_decompiler.h"
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#include "dexlayout.h"
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#include "oat_file.h"
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#include "vdex_file.h"
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namespace openjdkjvmti {
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static void RecomputeDexChecksum(art::DexFile* dex_file) {
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reinterpret_cast<art::DexFile::Header*>(const_cast<uint8_t*>(dex_file->Begin()))->checksum_ =
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dex_file->CalculateChecksum();
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}
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static const art::VdexFile* GetVdex(const art::DexFile& original_dex_file) {
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const art::OatDexFile* oat_dex = original_dex_file.GetOatDexFile();
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if (oat_dex == nullptr) {
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return nullptr;
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}
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const art::OatFile* oat_file = oat_dex->GetOatFile();
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if (oat_file == nullptr) {
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return nullptr;
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}
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return oat_file->GetVdexFile();
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}
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static void DoDexUnquicken(const art::DexFile& new_dex_file,
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const art::DexFile& original_dex_file) {
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const art::VdexFile* vdex = GetVdex(original_dex_file);
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if (vdex != nullptr) {
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vdex->UnquickenDexFile(new_dex_file,
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original_dex_file,
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/* decompile_return_instruction= */ true);
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}
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}
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static void DCheckVerifyDexFile(const art::DexFile& dex) {
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if (art::kIsDebugBuild) {
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std::string error;
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if (!art::DexFileVerifier::Verify(&dex,
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dex.Begin(),
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dex.Size(),
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"FixedUpDexFile_Verification.dex",
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/*verify_checksum=*/ true,
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&error)) {
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LOG(FATAL) << "Failed to verify de-quickened dex file: " << error;
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}
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}
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}
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std::unique_ptr<FixedUpDexFile> FixedUpDexFile::Create(const art::DexFile& original,
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const char* descriptor) {
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// Copy the data into mutable memory.
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std::vector<unsigned char> data;
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std::unique_ptr<const art::DexFile> new_dex_file;
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std::string error;
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// Do not use ArtDexFileLoader here. This code runs in a signal handler and
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// its stack is too small to invoke the required LocationIsOnSystemFramework
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// (b/76429651). Instead, we use DexFileLoader and copy the IsPlatformDexFile
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// property from `original` to `new_dex_file`.
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const art::DexFileLoader dex_file_loader;
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if (original.IsCompactDexFile() || original.HasHiddenapiClassData()) {
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// Since we are supposed to return a standard dex, convert back using dexlayout. It's OK to do
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// this before unquickening.
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// We also do dex layout for dex files that have hidden API data, as we want to remove that
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// data.
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art::Options options;
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options.compact_dex_level_ = art::CompactDexLevel::kCompactDexLevelNone;
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// Add a filter to only include the class that has the matching descriptor.
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static constexpr bool kFilterByDescriptor = true;
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if (kFilterByDescriptor) {
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options.class_filter_.insert(descriptor);
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}
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art::DexLayout dex_layout(options,
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/*info=*/ nullptr,
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/*out_file=*/ nullptr,
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/*header=*/ nullptr);
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std::unique_ptr<art::DexContainer> dex_container;
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bool result = dex_layout.ProcessDexFile(
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original.GetLocation().c_str(),
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&original,
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0,
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&dex_container,
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&error);
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CHECK(result) << "Failed to generate dex file " << error;
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art::DexContainer::Section* main_section = dex_container->GetMainSection();
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CHECK_EQ(dex_container->GetDataSection()->Size(), 0u);
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data.insert(data.end(), main_section->Begin(), main_section->End());
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} else {
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data.resize(original.Size());
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memcpy(data.data(), original.Begin(), original.Size());
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}
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// Open the dex file in the buffer.
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new_dex_file = dex_file_loader.Open(
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data.data(),
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data.size(),
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/*location=*/"Unquickening_dexfile.dex",
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/*location_checksum=*/0,
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/*oat_dex_file=*/nullptr,
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/*verify=*/false,
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/*verify_checksum=*/false,
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&error);
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if (new_dex_file == nullptr) {
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LOG(ERROR) << "Unable to open dex file from memory for unquickening! error: " << error;
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return nullptr;
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}
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new_dex_file->SetHiddenapiDomain(original.GetHiddenapiDomain());
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DoDexUnquicken(*new_dex_file, original);
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RecomputeDexChecksum(const_cast<art::DexFile*>(new_dex_file.get()));
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DCheckVerifyDexFile(*new_dex_file);
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std::unique_ptr<FixedUpDexFile> ret(new FixedUpDexFile(std::move(new_dex_file), std::move(data)));
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return ret;
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}
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} // namespace openjdkjvmti
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