/* Copyright (C) 2017 The Android Open Source Project * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This file implements interfaces from the file jvmti.h. This implementation * is licensed under the same terms as the file jvmti.h. The * copyright and license information for the file jvmti.h follows. * * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ #include "base/leb128.h" #include "fixed_up_dex_file.h" #include "dex/dex_file-inl.h" #include "dex/dex_file_loader.h" #include "dex/dex_file_verifier.h" // Runtime includes. #include "dex_container.h" #include "dex/compact_dex_level.h" #include "dex_to_dex_decompiler.h" #include "dexlayout.h" #include "oat_file.h" #include "vdex_file.h" namespace openjdkjvmti { static void RecomputeDexChecksum(art::DexFile* dex_file) { reinterpret_cast<art::DexFile::Header*>(const_cast<uint8_t*>(dex_file->Begin()))->checksum_ = dex_file->CalculateChecksum(); } static void UnhideApis(const art::DexFile& target_dex_file) { for (uint32_t i = 0; i < target_dex_file.NumClassDefs(); ++i) { const uint8_t* class_data = target_dex_file.GetClassData(target_dex_file.GetClassDef(i)); if (class_data != nullptr) { for (art::ClassDataItemIterator class_it(target_dex_file, class_data); class_it.HasNext(); class_it.Next()) { art::DexFile::UnHideAccessFlags(class_it); } } } } static const art::VdexFile* GetVdex(const art::DexFile& original_dex_file) { const art::OatDexFile* oat_dex = original_dex_file.GetOatDexFile(); if (oat_dex == nullptr) { return nullptr; } const art::OatFile* oat_file = oat_dex->GetOatFile(); if (oat_file == nullptr) { return nullptr; } return oat_file->GetVdexFile(); } static void DoDexUnquicken(const art::DexFile& new_dex_file, const art::DexFile& original_dex_file) { const art::VdexFile* vdex = GetVdex(original_dex_file); if (vdex != nullptr) { vdex->UnquickenDexFile(new_dex_file, original_dex_file, /* decompile_return_instruction */true); } else { // The dex file isn't quickened since it is being used directly. We might still have hiddenapis // so we need to get rid of those. UnhideApis(new_dex_file); } } static void DCheckVerifyDexFile(const art::DexFile& dex) { if (art::kIsDebugBuild) { std::string error; if (!art::DexFileVerifier::Verify(&dex, dex.Begin(), dex.Size(), "FixedUpDexFile_Verification.dex", /*verify_checksum*/ true, &error)) { LOG(FATAL) << "Failed to verify de-quickened dex file: " << error; } } } std::unique_ptr<FixedUpDexFile> FixedUpDexFile::Create(const art::DexFile& original, const char* descriptor) { // Copy the data into mutable memory. std::vector<unsigned char> data; std::unique_ptr<const art::DexFile> new_dex_file; std::string error; // Do not use ArtDexFileLoader here. This code runs in a signal handler and // its stack is too small to invoke the required LocationIsOnSystemFramework // (b/76429651). Instead, we use DexFileLoader and copy the IsPlatformDexFile // property from `original` to `new_dex_file`. const art::DexFileLoader dex_file_loader; if (original.IsCompactDexFile()) { // Since we are supposed to return a standard dex, convert back using dexlayout. It's OK to do // this before unquickening. art::Options options; options.compact_dex_level_ = art::CompactDexLevel::kCompactDexLevelNone; // Never verify the output since hidden API flags may cause the dex file verifier to fail. // See b/74063493 options.verify_output_ = false; // Add a filter to only include the class that has the matching descriptor. static constexpr bool kFilterByDescriptor = true; if (kFilterByDescriptor) { options.class_filter_.insert(descriptor); } art::DexLayout dex_layout(options, /*info*/ nullptr, /*out_file*/ nullptr, /*header*/ nullptr); std::unique_ptr<art::DexContainer> dex_container; bool result = dex_layout.ProcessDexFile( original.GetLocation().c_str(), &original, 0, &dex_container, &error); CHECK(result) << "Failed to generate dex file " << error; art::DexContainer::Section* main_section = dex_container->GetMainSection(); CHECK_EQ(dex_container->GetDataSection()->Size(), 0u); data.insert(data.end(), main_section->Begin(), main_section->End()); } else { data.resize(original.Size()); memcpy(data.data(), original.Begin(), original.Size()); } // Open the dex file in the buffer. new_dex_file = dex_file_loader.Open( data.data(), data.size(), /*location*/"Unquickening_dexfile.dex", /*location_checksum*/0, /*oat_dex_file*/nullptr, /*verify*/false, /*verify_checksum*/false, &error); if (new_dex_file == nullptr) { LOG(ERROR) << "Unable to open dex file from memory for unquickening! error: " << error; return nullptr; } if (original.IsPlatformDexFile()) { const_cast<art::DexFile*>(new_dex_file.get())->SetIsPlatformDexFile(); } DoDexUnquicken(*new_dex_file, original); RecomputeDexChecksum(const_cast<art::DexFile*>(new_dex_file.get())); DCheckVerifyDexFile(*new_dex_file); std::unique_ptr<FixedUpDexFile> ret(new FixedUpDexFile(std::move(new_dex_file), std::move(data))); return ret; } } // namespace openjdkjvmti