| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "art_dex_file_loader.h" |
| |
| #include <sys/stat.h> |
| |
| #include "android-base/stringprintf.h" |
| |
| #include "base/file_magic.h" |
| #include "base/file_utils.h" |
| #include "base/mem_map.h" |
| #include "base/mman.h" // For the PROT_* and MAP_* constants. |
| #include "base/stl_util.h" |
| #include "base/systrace.h" |
| #include "base/unix_file/fd_file.h" |
| #include "base/zip_archive.h" |
| #include "dex/compact_dex_file.h" |
| #include "dex/dex_file.h" |
| #include "dex/dex_file_verifier.h" |
| #include "dex/standard_dex_file.h" |
| |
| namespace art { |
| |
| namespace { |
| |
| class MemMapContainer : public DexFileContainer { |
| public: |
| explicit MemMapContainer(MemMap&& mem_map) : mem_map_(std::move(mem_map)) { } |
| ~MemMapContainer() override { } |
| |
| int GetPermissions() override { |
| if (!mem_map_.IsValid()) { |
| return 0; |
| } else { |
| return mem_map_.GetProtect(); |
| } |
| } |
| |
| bool IsReadOnly() override { |
| return GetPermissions() == PROT_READ; |
| } |
| |
| bool EnableWrite() override { |
| CHECK(IsReadOnly()); |
| if (!mem_map_.IsValid()) { |
| return false; |
| } else { |
| return mem_map_.Protect(PROT_READ | PROT_WRITE); |
| } |
| } |
| |
| bool DisableWrite() override { |
| CHECK(!IsReadOnly()); |
| if (!mem_map_.IsValid()) { |
| return false; |
| } else { |
| return mem_map_.Protect(PROT_READ); |
| } |
| } |
| |
| private: |
| MemMap mem_map_; |
| DISALLOW_COPY_AND_ASSIGN(MemMapContainer); |
| }; |
| |
| } // namespace |
| |
| using android::base::StringPrintf; |
| |
| static constexpr OatDexFile* kNoOatDexFile = nullptr; |
| |
| |
| bool ArtDexFileLoader::GetMultiDexChecksums(const char* filename, |
| std::vector<uint32_t>* checksums, |
| std::string* error_msg, |
| int zip_fd, |
| bool* zip_file_only_contains_uncompressed_dex) const { |
| CHECK(checksums != nullptr); |
| uint32_t magic; |
| |
| File fd; |
| if (zip_fd != -1) { |
| if (ReadMagicAndReset(zip_fd, &magic, error_msg)) { |
| fd = File(DupCloexec(zip_fd), /* check_usage= */ false); |
| } |
| } else { |
| fd = OpenAndReadMagic(filename, &magic, error_msg); |
| } |
| if (fd.Fd() == -1) { |
| DCHECK(!error_msg->empty()); |
| return false; |
| } |
| if (IsZipMagic(magic)) { |
| std::unique_ptr<ZipArchive> zip_archive( |
| ZipArchive::OpenFromFd(fd.Release(), filename, error_msg)); |
| if (zip_archive.get() == nullptr) { |
| *error_msg = StringPrintf("Failed to open zip archive '%s' (error msg: %s)", filename, |
| error_msg->c_str()); |
| return false; |
| } |
| |
| uint32_t i = 0; |
| std::string zip_entry_name = GetMultiDexClassesDexName(i++); |
| std::unique_ptr<ZipEntry> zip_entry(zip_archive->Find(zip_entry_name.c_str(), error_msg)); |
| if (zip_entry.get() == nullptr) { |
| *error_msg = StringPrintf("Zip archive '%s' doesn't contain %s (error msg: %s)", filename, |
| zip_entry_name.c_str(), error_msg->c_str()); |
| return false; |
| } |
| |
| if (zip_file_only_contains_uncompressed_dex != nullptr) { |
| // Start by assuming everything is uncompressed. |
| *zip_file_only_contains_uncompressed_dex = true; |
| } |
| |
| do { |
| if (zip_file_only_contains_uncompressed_dex != nullptr) { |
| if (!(zip_entry->IsUncompressed() && zip_entry->IsAlignedTo(alignof(DexFile::Header)))) { |
| *zip_file_only_contains_uncompressed_dex = false; |
| } |
| } |
| checksums->push_back(zip_entry->GetCrc32()); |
| zip_entry_name = GetMultiDexClassesDexName(i++); |
| zip_entry.reset(zip_archive->Find(zip_entry_name.c_str(), error_msg)); |
| } while (zip_entry.get() != nullptr); |
| return true; |
| } |
| if (IsMagicValid(magic)) { |
| std::unique_ptr<const DexFile> dex_file(OpenFile(fd.Release(), |
| filename, |
| /* verify= */ false, |
| /* verify_checksum= */ false, |
| /* mmap_shared= */ false, |
| error_msg)); |
| if (dex_file == nullptr) { |
| return false; |
| } |
| checksums->push_back(dex_file->GetHeader().checksum_); |
| return true; |
| } |
| *error_msg = StringPrintf("Expected valid zip or dex file: '%s'", filename); |
| return false; |
| } |
| |
| std::unique_ptr<const DexFile> ArtDexFileLoader::Open( |
| const uint8_t* base, |
| size_t size, |
| const std::string& location, |
| uint32_t location_checksum, |
| const OatDexFile* oat_dex_file, |
| bool verify, |
| bool verify_checksum, |
| std::string* error_msg, |
| std::unique_ptr<DexFileContainer> container) const { |
| ScopedTrace trace(std::string("Open dex file from RAM ") + location); |
| return OpenCommon(base, |
| size, |
| /*data_base=*/ nullptr, |
| /*data_size=*/ 0u, |
| location, |
| location_checksum, |
| oat_dex_file, |
| verify, |
| verify_checksum, |
| error_msg, |
| std::move(container), |
| /*verify_result=*/ nullptr); |
| } |
| |
| std::unique_ptr<const DexFile> ArtDexFileLoader::Open(const std::string& location, |
| uint32_t location_checksum, |
| MemMap&& map, |
| bool verify, |
| bool verify_checksum, |
| std::string* error_msg) const { |
| ScopedTrace trace(std::string("Open dex file from mapped-memory ") + location); |
| CHECK(map.IsValid()); |
| |
| size_t size = map.Size(); |
| if (size < sizeof(DexFile::Header)) { |
| *error_msg = StringPrintf( |
| "DexFile: failed to open dex file '%s' that is too short to have a header", |
| location.c_str()); |
| return nullptr; |
| } |
| |
| uint8_t* begin = map.Begin(); |
| std::unique_ptr<DexFile> dex_file = OpenCommon(begin, |
| size, |
| /*data_base=*/ nullptr, |
| /*data_size=*/ 0u, |
| location, |
| location_checksum, |
| kNoOatDexFile, |
| verify, |
| verify_checksum, |
| error_msg, |
| std::make_unique<MemMapContainer>(std::move(map)), |
| /*verify_result=*/ nullptr); |
| // Opening CompactDex is only supported from vdex files. |
| if (dex_file != nullptr && dex_file->IsCompactDexFile()) { |
| *error_msg = StringPrintf("Opening CompactDex file '%s' is only supported from vdex files", |
| location.c_str()); |
| return nullptr; |
| } |
| return dex_file; |
| } |
| |
| bool ArtDexFileLoader::Open(const char* filename, |
| const std::string& location, |
| bool verify, |
| bool verify_checksum, |
| std::string* error_msg, |
| std::vector<std::unique_ptr<const DexFile>>* dex_files) const { |
| ScopedTrace trace(std::string("Open dex file ") + std::string(location)); |
| DCHECK(dex_files != nullptr) << "DexFile::Open: out-param is nullptr"; |
| uint32_t magic; |
| File fd = OpenAndReadMagic(filename, &magic, error_msg); |
| if (fd.Fd() == -1) { |
| DCHECK(!error_msg->empty()); |
| return false; |
| } |
| if (IsZipMagic(magic)) { |
| return OpenZip(fd.Release(), location, verify, verify_checksum, error_msg, dex_files); |
| } |
| if (IsMagicValid(magic)) { |
| std::unique_ptr<const DexFile> dex_file(OpenFile(fd.Release(), |
| location, |
| verify, |
| verify_checksum, |
| /* mmap_shared= */ false, |
| error_msg)); |
| if (dex_file.get() != nullptr) { |
| dex_files->push_back(std::move(dex_file)); |
| return true; |
| } else { |
| return false; |
| } |
| } |
| *error_msg = StringPrintf("Expected valid zip or dex file: '%s'", filename); |
| return false; |
| } |
| |
| std::unique_ptr<const DexFile> ArtDexFileLoader::OpenDex(int fd, |
| const std::string& location, |
| bool verify, |
| bool verify_checksum, |
| bool mmap_shared, |
| std::string* error_msg) const { |
| ScopedTrace trace("Open dex file " + std::string(location)); |
| return OpenFile(fd, location, verify, verify_checksum, mmap_shared, error_msg); |
| } |
| |
| bool ArtDexFileLoader::OpenZip(int fd, |
| const std::string& location, |
| bool verify, |
| bool verify_checksum, |
| std::string* error_msg, |
| std::vector<std::unique_ptr<const DexFile>>* dex_files) const { |
| ScopedTrace trace("Dex file open Zip " + std::string(location)); |
| DCHECK(dex_files != nullptr) << "DexFile::OpenZip: out-param is nullptr"; |
| std::unique_ptr<ZipArchive> zip_archive(ZipArchive::OpenFromFd(fd, location.c_str(), error_msg)); |
| if (zip_archive.get() == nullptr) { |
| DCHECK(!error_msg->empty()); |
| return false; |
| } |
| return OpenAllDexFilesFromZip( |
| *zip_archive, location, verify, verify_checksum, error_msg, dex_files); |
| } |
| |
| std::unique_ptr<const DexFile> ArtDexFileLoader::OpenFile(int fd, |
| const std::string& location, |
| bool verify, |
| bool verify_checksum, |
| bool mmap_shared, |
| std::string* error_msg) const { |
| ScopedTrace trace(std::string("Open dex file ") + std::string(location)); |
| CHECK(!location.empty()); |
| MemMap map; |
| { |
| File delayed_close(fd, /* check_usage= */ false); |
| struct stat sbuf; |
| memset(&sbuf, 0, sizeof(sbuf)); |
| if (fstat(fd, &sbuf) == -1) { |
| *error_msg = StringPrintf("DexFile: fstat '%s' failed: %s", location.c_str(), |
| strerror(errno)); |
| return nullptr; |
| } |
| if (S_ISDIR(sbuf.st_mode)) { |
| *error_msg = StringPrintf("Attempt to mmap directory '%s'", location.c_str()); |
| return nullptr; |
| } |
| size_t length = sbuf.st_size; |
| map = MemMap::MapFile(length, |
| PROT_READ, |
| mmap_shared ? MAP_SHARED : MAP_PRIVATE, |
| fd, |
| 0, |
| /*low_4gb=*/false, |
| location.c_str(), |
| error_msg); |
| if (!map.IsValid()) { |
| DCHECK(!error_msg->empty()); |
| return nullptr; |
| } |
| } |
| |
| const uint8_t* begin = map.Begin(); |
| size_t size = map.Size(); |
| if (size < sizeof(DexFile::Header)) { |
| *error_msg = StringPrintf( |
| "DexFile: failed to open dex file '%s' that is too short to have a header", |
| location.c_str()); |
| return nullptr; |
| } |
| |
| const DexFile::Header* dex_header = reinterpret_cast<const DexFile::Header*>(begin); |
| |
| std::unique_ptr<DexFile> dex_file = OpenCommon(begin, |
| size, |
| /*data_base=*/ nullptr, |
| /*data_size=*/ 0u, |
| location, |
| dex_header->checksum_, |
| kNoOatDexFile, |
| verify, |
| verify_checksum, |
| error_msg, |
| std::make_unique<MemMapContainer>(std::move(map)), |
| /*verify_result=*/ nullptr); |
| |
| // Opening CompactDex is only supported from vdex files. |
| if (dex_file != nullptr && dex_file->IsCompactDexFile()) { |
| *error_msg = StringPrintf("Opening CompactDex file '%s' is only supported from vdex files", |
| location.c_str()); |
| return nullptr; |
| } |
| return dex_file; |
| } |
| |
| std::unique_ptr<const DexFile> ArtDexFileLoader::OpenOneDexFileFromZip( |
| const ZipArchive& zip_archive, |
| const char* entry_name, |
| const std::string& location, |
| bool verify, |
| bool verify_checksum, |
| std::string* error_msg, |
| DexFileLoaderErrorCode* error_code) const { |
| ScopedTrace trace("Dex file open from Zip Archive " + std::string(location)); |
| CHECK(!location.empty()); |
| std::unique_ptr<ZipEntry> zip_entry(zip_archive.Find(entry_name, error_msg)); |
| if (zip_entry == nullptr) { |
| *error_code = DexFileLoaderErrorCode::kEntryNotFound; |
| return nullptr; |
| } |
| if (zip_entry->GetUncompressedLength() == 0) { |
| *error_msg = StringPrintf("Dex file '%s' has zero length", location.c_str()); |
| *error_code = DexFileLoaderErrorCode::kDexFileError; |
| return nullptr; |
| } |
| |
| MemMap map; |
| if (zip_entry->IsUncompressed()) { |
| if (!zip_entry->IsAlignedTo(alignof(DexFile::Header))) { |
| // Do not mmap unaligned ZIP entries because |
| // doing so would fail dex verification which requires 4 byte alignment. |
| LOG(WARNING) << "Can't mmap dex file " << location << "!" << entry_name << " directly; " |
| << "please zipalign to " << alignof(DexFile::Header) << " bytes. " |
| << "Falling back to extracting file."; |
| } else { |
| // Map uncompressed files within zip as file-backed to avoid a dirty copy. |
| map = zip_entry->MapDirectlyFromFile(location.c_str(), /*out*/error_msg); |
| if (!map.IsValid()) { |
| LOG(WARNING) << "Can't mmap dex file " << location << "!" << entry_name << " directly; " |
| << "is your ZIP file corrupted? Falling back to extraction."; |
| // Try again with Extraction which still has a chance of recovery. |
| } |
| } |
| } |
| |
| if (!map.IsValid()) { |
| // Default path for compressed ZIP entries, |
| // and fallback for stored ZIP entries. |
| map = zip_entry->ExtractToMemMap(location.c_str(), entry_name, error_msg); |
| } |
| |
| if (!map.IsValid()) { |
| *error_msg = StringPrintf("Failed to extract '%s' from '%s': %s", entry_name, location.c_str(), |
| error_msg->c_str()); |
| *error_code = DexFileLoaderErrorCode::kExtractToMemoryError; |
| return nullptr; |
| } |
| VerifyResult verify_result; |
| uint8_t* begin = map.Begin(); |
| size_t size = map.Size(); |
| std::unique_ptr<DexFile> dex_file = OpenCommon(begin, |
| size, |
| /*data_base=*/ nullptr, |
| /*data_size=*/ 0u, |
| location, |
| zip_entry->GetCrc32(), |
| kNoOatDexFile, |
| verify, |
| verify_checksum, |
| error_msg, |
| std::make_unique<MemMapContainer>(std::move(map)), |
| &verify_result); |
| if (dex_file != nullptr && dex_file->IsCompactDexFile()) { |
| *error_msg = StringPrintf("Opening CompactDex file '%s' is only supported from vdex files", |
| location.c_str()); |
| return nullptr; |
| } |
| if (dex_file == nullptr) { |
| if (verify_result == VerifyResult::kVerifyNotAttempted) { |
| *error_code = DexFileLoaderErrorCode::kDexFileError; |
| } else { |
| *error_code = DexFileLoaderErrorCode::kVerifyError; |
| } |
| return nullptr; |
| } |
| if (!dex_file->DisableWrite()) { |
| *error_msg = StringPrintf("Failed to make dex file '%s' read only", location.c_str()); |
| *error_code = DexFileLoaderErrorCode::kMakeReadOnlyError; |
| return nullptr; |
| } |
| CHECK(dex_file->IsReadOnly()) << location; |
| if (verify_result != VerifyResult::kVerifySucceeded) { |
| *error_code = DexFileLoaderErrorCode::kVerifyError; |
| return nullptr; |
| } |
| *error_code = DexFileLoaderErrorCode::kNoError; |
| return dex_file; |
| } |
| |
| // Technically we do not have a limitation with respect to the number of dex files that can be in a |
| // multidex APK. However, it's bad practice, as each dex file requires its own tables for symbols |
| // (types, classes, methods, ...) and dex caches. So warn the user that we open a zip with what |
| // seems an excessive number. |
| static constexpr size_t kWarnOnManyDexFilesThreshold = 100; |
| |
| bool ArtDexFileLoader::OpenAllDexFilesFromZip( |
| const ZipArchive& zip_archive, |
| const std::string& location, |
| bool verify, |
| bool verify_checksum, |
| std::string* error_msg, |
| std::vector<std::unique_ptr<const DexFile>>* dex_files) const { |
| ScopedTrace trace("Dex file open from Zip " + std::string(location)); |
| DCHECK(dex_files != nullptr) << "DexFile::OpenFromZip: out-param is nullptr"; |
| DexFileLoaderErrorCode error_code; |
| std::unique_ptr<const DexFile> dex_file(OpenOneDexFileFromZip(zip_archive, |
| kClassesDex, |
| location, |
| verify, |
| verify_checksum, |
| error_msg, |
| &error_code)); |
| if (dex_file.get() == nullptr) { |
| return false; |
| } else { |
| // Had at least classes.dex. |
| dex_files->push_back(std::move(dex_file)); |
| |
| // Now try some more. |
| |
| // We could try to avoid std::string allocations by working on a char array directly. As we |
| // do not expect a lot of iterations, this seems too involved and brittle. |
| |
| for (size_t i = 1; ; ++i) { |
| std::string name = GetMultiDexClassesDexName(i); |
| std::string fake_location = GetMultiDexLocation(i, location.c_str()); |
| std::unique_ptr<const DexFile> next_dex_file(OpenOneDexFileFromZip(zip_archive, |
| name.c_str(), |
| fake_location, |
| verify, |
| verify_checksum, |
| error_msg, |
| &error_code)); |
| if (next_dex_file.get() == nullptr) { |
| if (error_code != DexFileLoaderErrorCode::kEntryNotFound) { |
| LOG(WARNING) << "Zip open failed: " << *error_msg; |
| } |
| break; |
| } else { |
| dex_files->push_back(std::move(next_dex_file)); |
| } |
| |
| if (i == kWarnOnManyDexFilesThreshold) { |
| LOG(WARNING) << location << " has in excess of " << kWarnOnManyDexFilesThreshold |
| << " dex files. Please consider coalescing and shrinking the number to " |
| " avoid runtime overhead."; |
| } |
| |
| if (i == std::numeric_limits<size_t>::max()) { |
| LOG(ERROR) << "Overflow in number of dex files!"; |
| break; |
| } |
| } |
| |
| return true; |
| } |
| } |
| |
| std::unique_ptr<DexFile> ArtDexFileLoader::OpenCommon(const uint8_t* base, |
| size_t size, |
| const uint8_t* data_base, |
| size_t data_size, |
| const std::string& location, |
| uint32_t location_checksum, |
| const OatDexFile* oat_dex_file, |
| bool verify, |
| bool verify_checksum, |
| std::string* error_msg, |
| std::unique_ptr<DexFileContainer> container, |
| VerifyResult* verify_result) { |
| std::unique_ptr<DexFile> dex_file = DexFileLoader::OpenCommon(base, |
| size, |
| data_base, |
| data_size, |
| location, |
| location_checksum, |
| oat_dex_file, |
| verify, |
| verify_checksum, |
| error_msg, |
| std::move(container), |
| verify_result); |
| |
| // Check if this dex file is located in the framework directory. |
| // If it is, set a flag on the dex file. This is used by hidden API |
| // policy decision logic. |
| // Location can contain multidex suffix, so fetch its canonical version. Note |
| // that this will call `realpath`. |
| std::string path = DexFileLoader::GetDexCanonicalLocation(location.c_str()); |
| if (dex_file != nullptr && LocationIsOnSystemFramework(path.c_str())) { |
| dex_file->SetIsPlatformDexFile(); |
| } |
| |
| return dex_file; |
| } |
| |
| } // namespace art |