| /* |
| * Copyright (C) 2011 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 "file_utils.h" |
| |
| #include <inttypes.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #ifndef _WIN32 |
| #include <sys/wait.h> |
| #endif |
| #include <unistd.h> |
| |
| // We need dladdr. |
| #if !defined(__APPLE__) && !defined(_WIN32) |
| #ifndef _GNU_SOURCE |
| #define _GNU_SOURCE |
| #define DEFINED_GNU_SOURCE |
| #endif |
| #include <dlfcn.h> |
| #include <libgen.h> |
| #ifdef DEFINED_GNU_SOURCE |
| #undef _GNU_SOURCE |
| #undef DEFINED_GNU_SOURCE |
| #endif |
| #endif |
| |
| #include <memory> |
| #include <sstream> |
| |
| #include "android-base/file.h" |
| #include "android-base/logging.h" |
| #include "android-base/stringprintf.h" |
| #include "android-base/strings.h" |
| #include "base/bit_utils.h" |
| #include "base/globals.h" |
| #include "base/os.h" |
| #include "base/stl_util.h" |
| #include "base/unix_file/fd_file.h" |
| |
| #if defined(__APPLE__) |
| #include <crt_externs.h> |
| #include <sys/syscall.h> |
| #include "AvailabilityMacros.h" // For MAC_OS_X_VERSION_MAX_ALLOWED |
| #endif |
| |
| #if defined(__linux__) |
| #include <linux/unistd.h> |
| #endif |
| |
| namespace art { |
| |
| using android::base::StringPrintf; |
| |
| static constexpr const char* kClassesDex = "classes.dex"; |
| static constexpr const char* kAndroidRootEnvVar = "ANDROID_ROOT"; |
| static constexpr const char* kAndroidRootDefaultPath = "/system"; |
| static constexpr const char* kAndroidSystemExtRootEnvVar = "ANDROID_SYSTEM_EXT"; |
| static constexpr const char* kAndroidSystemExtRootDefaultPath = "/system_ext"; |
| static constexpr const char* kAndroidDataEnvVar = "ANDROID_DATA"; |
| static constexpr const char* kAndroidDataDefaultPath = "/data"; |
| static constexpr const char* kAndroidArtRootEnvVar = "ANDROID_ART_ROOT"; |
| static constexpr const char* kAndroidConscryptRootEnvVar = "ANDROID_CONSCRYPT_ROOT"; |
| static constexpr const char* kAndroidI18nRootEnvVar = "ANDROID_I18N_ROOT"; |
| static constexpr const char* kApexDefaultPath = "/apex/"; |
| static constexpr const char* kArtApexDataEnvVar = "ART_APEX_DATA"; |
| |
| // Get the "root" directory containing the "lib" directory where this instance |
| // of the libartbase library (which contains `GetRootContainingLibartbase`) is |
| // located: |
| // - on host this "root" is normally the Android Root (e.g. something like |
| // "$ANDROID_BUILD_TOP/out/host/linux-x86/"); |
| // - on target this "root" is normally the ART Root ("/apex/com.android.art"). |
| // Return the empty string if that directory cannot be found or if this code is |
| // run on Windows or macOS. |
| static std::string GetRootContainingLibartbase() { |
| #if !defined( _WIN32) && !defined(__APPLE__) |
| // Check where libartbase is from, and derive from there. |
| Dl_info info; |
| if (dladdr(reinterpret_cast<const void*>(&GetRootContainingLibartbase), /* out */ &info) != 0) { |
| // Make a duplicate of the fname so dirname can modify it. |
| UniqueCPtr<char> fname(strdup(info.dli_fname)); |
| |
| char* dir1 = dirname(fname.get()); // This is the lib directory. |
| char* dir2 = dirname(dir1); // This is the "root" directory. |
| if (OS::DirectoryExists(dir2)) { |
| std::string tmp = dir2; // Make a copy here so that fname can be released. |
| return tmp; |
| } |
| } |
| #endif |
| return ""; |
| } |
| |
| std::string GetAndroidRootSafe(std::string* error_msg) { |
| #ifdef _WIN32 |
| UNUSED(kAndroidRootEnvVar, kAndroidRootDefaultPath, GetRootContainingLibartbase); |
| *error_msg = "GetAndroidRootSafe unsupported for Windows."; |
| return ""; |
| #else |
| // Prefer ANDROID_ROOT if it's set. |
| const char* android_root_from_env = getenv(kAndroidRootEnvVar); |
| if (android_root_from_env != nullptr) { |
| if (!OS::DirectoryExists(android_root_from_env)) { |
| *error_msg = |
| StringPrintf("Failed to find %s directory %s", kAndroidRootEnvVar, android_root_from_env); |
| return ""; |
| } |
| return android_root_from_env; |
| } |
| |
| // On host, libartbase is currently installed in "$ANDROID_ROOT/lib" |
| // (e.g. something like "$ANDROID_BUILD_TOP/out/host/linux-x86/lib". Use this |
| // information to infer the location of the Android Root (on host only). |
| // |
| // Note that this could change in the future, if we decided to install ART |
| // artifacts in a different location, e.g. within an "ART APEX" directory. |
| if (!kIsTargetBuild) { |
| std::string root_containing_libartbase = GetRootContainingLibartbase(); |
| if (!root_containing_libartbase.empty()) { |
| return root_containing_libartbase; |
| } |
| } |
| |
| // Try the default path. |
| if (!OS::DirectoryExists(kAndroidRootDefaultPath)) { |
| *error_msg = |
| StringPrintf("Failed to find default Android Root directory %s", kAndroidRootDefaultPath); |
| return ""; |
| } |
| return kAndroidRootDefaultPath; |
| #endif |
| } |
| |
| std::string GetAndroidRoot() { |
| std::string error_msg; |
| std::string ret = GetAndroidRootSafe(&error_msg); |
| if (ret.empty()) { |
| LOG(FATAL) << error_msg; |
| UNREACHABLE(); |
| } |
| return ret; |
| } |
| |
| |
| static const char* GetAndroidDirSafe(const char* env_var, |
| const char* default_dir, |
| bool must_exist, |
| std::string* error_msg) { |
| const char* android_dir = getenv(env_var); |
| if (android_dir == nullptr) { |
| if (!must_exist || OS::DirectoryExists(default_dir)) { |
| android_dir = default_dir; |
| } else { |
| *error_msg = StringPrintf("%s not set and %s does not exist", env_var, default_dir); |
| return nullptr; |
| } |
| } |
| if (must_exist && !OS::DirectoryExists(android_dir)) { |
| *error_msg = StringPrintf("Failed to find directory %s", android_dir); |
| return nullptr; |
| } |
| return android_dir; |
| } |
| |
| static const char* GetAndroidDir(const char* env_var, |
| const char* default_dir, |
| bool must_exist = true) { |
| std::string error_msg; |
| const char* dir = GetAndroidDirSafe(env_var, default_dir, must_exist, &error_msg); |
| if (dir != nullptr) { |
| return dir; |
| } else { |
| LOG(FATAL) << error_msg; |
| UNREACHABLE(); |
| } |
| } |
| |
| static std::string GetArtRootSafe(bool must_exist, /*out*/ std::string* error_msg) { |
| #ifdef _WIN32 |
| UNUSED(kAndroidArtRootEnvVar, kAndroidArtApexDefaultPath, GetRootContainingLibartbase); |
| UNUSED(must_exist); |
| *error_msg = "GetArtRootSafe unsupported for Windows."; |
| return ""; |
| #else |
| // Prefer ANDROID_ART_ROOT if it's set. |
| const char* android_art_root_from_env = getenv(kAndroidArtRootEnvVar); |
| if (android_art_root_from_env != nullptr) { |
| if (must_exist && !OS::DirectoryExists(android_art_root_from_env)) { |
| *error_msg = StringPrintf("Failed to find %s directory %s", |
| kAndroidArtRootEnvVar, |
| android_art_root_from_env); |
| return ""; |
| } |
| return android_art_root_from_env; |
| } |
| |
| // On target, libartbase is normally installed in |
| // "$ANDROID_ART_ROOT/lib(64)" (e.g. something like |
| // "/apex/com.android.art/lib(64)". Use this information to infer the |
| // location of the ART Root (on target only). |
| if (kIsTargetBuild) { |
| // *However*, a copy of libartbase may still be installed outside the |
| // ART Root on some occasions, as ART target gtests install their binaries |
| // and their dependencies under the Android Root, i.e. "/system" (see |
| // b/129534335). For that reason, we cannot reliably use |
| // `GetRootContainingLibartbase` to find the ART Root. (Note that this is |
| // not really a problem in practice, as Android Q devices define |
| // ANDROID_ART_ROOT in their default environment, and will instead use |
| // the logic above anyway.) |
| // |
| // TODO(b/129534335): Re-enable this logic when the only instance of |
| // libartbase on target is the one from the ART APEX. |
| if ((false)) { |
| std::string root_containing_libartbase = GetRootContainingLibartbase(); |
| if (!root_containing_libartbase.empty()) { |
| return root_containing_libartbase; |
| } |
| } |
| } |
| |
| // Try the default path. |
| if (must_exist && !OS::DirectoryExists(kAndroidArtApexDefaultPath)) { |
| *error_msg = StringPrintf("Failed to find default ART root directory %s", |
| kAndroidArtApexDefaultPath); |
| return ""; |
| } |
| return kAndroidArtApexDefaultPath; |
| #endif |
| } |
| |
| std::string GetArtRootSafe(std::string* error_msg) { |
| return GetArtRootSafe(/* must_exist= */ true, error_msg); |
| } |
| |
| std::string GetArtRoot() { |
| std::string error_msg; |
| std::string ret = GetArtRootSafe(&error_msg); |
| if (ret.empty()) { |
| LOG(FATAL) << error_msg; |
| UNREACHABLE(); |
| } |
| return ret; |
| } |
| |
| std::string GetArtBinDir() { |
| // Environment variable `ANDROID_ART_ROOT` is defined as |
| // `$ANDROID_HOST_OUT/com.android.art` on host. However, host ART binaries are |
| // still installed in `$ANDROID_HOST_OUT/bin` (i.e. outside the ART Root). The |
| // situation is cleaner on target, where `ANDROID_ART_ROOT` is |
| // `$ANDROID_ROOT/apex/com.android.art` and ART binaries are installed in |
| // `$ANDROID_ROOT/apex/com.android.art/bin`. |
| std::string android_art_root = kIsTargetBuild ? GetArtRoot() : GetAndroidRoot(); |
| return android_art_root + "/bin"; |
| } |
| |
| std::string GetAndroidDataSafe(std::string* error_msg) { |
| const char* android_dir = GetAndroidDirSafe(kAndroidDataEnvVar, |
| kAndroidDataDefaultPath, |
| /* must_exist= */ true, |
| error_msg); |
| return (android_dir != nullptr) ? android_dir : ""; |
| } |
| |
| std::string GetAndroidData() { |
| return GetAndroidDir(kAndroidDataEnvVar, kAndroidDataDefaultPath); |
| } |
| |
| std::string GetArtApexData() { |
| return GetAndroidDir(kArtApexDataEnvVar, kArtApexDataDefaultPath, /*must_exist=*/false); |
| } |
| |
| static std::string GetFirstBootClasspathExtensionJar(const std::string& android_root) { |
| DCHECK(kIsTargetBuild); |
| |
| // This method finds the first non-APEX DEX file in the boot class path as defined by the |
| // DEX2OATBOOTCLASSPATH environment variable. This corresponds to the first boot classpath |
| // extension (see IMAGE SECTION documentation in image.h). When on-device signing is used the |
| // boot class extensions are compiled together as a single image with a name derived from the |
| // first extension. This first boot classpath extension is usually |
| // '/system/framework/framework.jar'. |
| // |
| // DEX2OATBOOTCLASSPATH is generated at build time by in the init.environ.rc.in: |
| // ${ANDROID_BUILD_TOP}/system/core/rootdir/Android.mk |
| // and initialized on Android by init in init.environ.rc: |
| // ${ANDROID_BUILD_TOP}/system/core/rootdir/init.environ.rc.in. |
| // It is used by installd too. |
| const char* bcp = getenv("DEX2OATBOOTCLASSPATH"); |
| const std::string kDefaultBcpExtensionJar = android_root + "/framework/framework.jar"; |
| if (bcp != nullptr) { |
| for (std::string_view component : SplitString(bcp, ':')) { |
| if (component.empty()) { |
| continue; |
| } |
| if (!LocationIsOnApex(component)) { |
| return std::string{component}; |
| } |
| } |
| } |
| return kDefaultBcpExtensionJar; |
| } |
| |
| std::string GetDefaultBootImageLocation(const std::string& android_root, |
| bool deny_art_apex_data_files) { |
| constexpr static const char* kJavalibBootArt = "javalib/boot.art"; |
| constexpr static const char* kEtcBootImageProf = "etc/boot-image.prof"; |
| |
| // Boot image consists of two parts: |
| // - the primary boot image in the ART APEX (contains the Core Libraries) |
| // - the boot image extensions (contains framework libraries) on the system partition, or |
| // in the ART APEX data directory, if an update for the ART module has been been installed. |
| if (kIsTargetBuild && !deny_art_apex_data_files) { |
| // If the ART APEX has been updated, the compiled boot image extension will be in the ART APEX |
| // data directory (assuming there is space and we trust the artifacts there). Otherwise, for a factory installed ART APEX it is |
| // under $ANDROID_ROOT/framework/. |
| const std::string first_extension_jar{GetFirstBootClasspathExtensionJar(android_root)}; |
| const std::string boot_extension_image = GetApexDataBootImage(first_extension_jar); |
| const std::string boot_extension_filename = |
| GetSystemImageFilename(boot_extension_image.c_str(), kRuntimeISA); |
| if (OS::FileExists(boot_extension_filename.c_str(), /*check_file_type=*/true)) { |
| return StringPrintf("%s/%s:%s!%s/%s", |
| kAndroidArtApexDefaultPath, |
| kJavalibBootArt, |
| boot_extension_image.c_str(), |
| android_root.c_str(), |
| kEtcBootImageProf); |
| } else if (errno == EACCES) { |
| // Additional warning for potential SELinux misconfiguration. |
| PLOG(ERROR) << "Default boot image check failed, could not stat: " << boot_extension_image; |
| } |
| } |
| return StringPrintf("%s/%s:%s/framework/boot-framework.art!%s/%s", |
| kAndroidArtApexDefaultPath, |
| kJavalibBootArt, |
| android_root.c_str(), |
| android_root.c_str(), |
| kEtcBootImageProf); |
| } |
| |
| std::string GetDefaultBootImageLocation(std::string* error_msg) { |
| std::string android_root = GetAndroidRootSafe(error_msg); |
| if (android_root.empty()) { |
| return ""; |
| } |
| return GetDefaultBootImageLocation(android_root, /*deny_art_apex_data_files=*/false); |
| } |
| |
| std::string GetBootImagePath(bool on_system, const std::string& jar_path) { |
| if (on_system) { |
| const std::string jar_name = android::base::Basename(jar_path); |
| const std::string image_name = ReplaceFileExtension(jar_name, "art"); |
| // Typically "/system/framework/boot-framework.art". |
| return StringPrintf("%s/framework/boot-%s", GetAndroidRoot().c_str(), image_name.c_str()); |
| } else { |
| // Typically "/data/misc/apexdata/com.android.art/dalvik-cache/boot-framework.art". |
| return GetApexDataBootImage(jar_path); |
| } |
| } |
| |
| static /*constinit*/ std::string_view dalvik_cache_sub_dir = "dalvik-cache"; |
| |
| void OverrideDalvikCacheSubDirectory(std::string sub_dir) { |
| static std::string overridden_dalvik_cache_sub_dir; |
| overridden_dalvik_cache_sub_dir = std::move(sub_dir); |
| dalvik_cache_sub_dir = overridden_dalvik_cache_sub_dir; |
| } |
| |
| static std::string GetDalvikCacheDirectory(std::string_view root_directory, |
| std::string_view sub_directory = {}) { |
| std::stringstream oss; |
| oss << root_directory << '/' << dalvik_cache_sub_dir; |
| if (!sub_directory.empty()) { |
| oss << '/' << sub_directory; |
| } |
| return oss.str(); |
| } |
| |
| void GetDalvikCache(const char* subdir, const bool create_if_absent, std::string* dalvik_cache, |
| bool* have_android_data, bool* dalvik_cache_exists, bool* is_global_cache) { |
| #ifdef _WIN32 |
| UNUSED(subdir); |
| UNUSED(create_if_absent); |
| UNUSED(dalvik_cache); |
| UNUSED(have_android_data); |
| UNUSED(dalvik_cache_exists); |
| UNUSED(is_global_cache); |
| LOG(FATAL) << "GetDalvikCache unsupported on Windows."; |
| #else |
| CHECK(subdir != nullptr); |
| std::string unused_error_msg; |
| std::string android_data = GetAndroidDataSafe(&unused_error_msg); |
| if (android_data.empty()) { |
| *have_android_data = false; |
| *dalvik_cache_exists = false; |
| *is_global_cache = false; |
| return; |
| } else { |
| *have_android_data = true; |
| } |
| const std::string dalvik_cache_root = GetDalvikCacheDirectory(android_data); |
| *dalvik_cache = dalvik_cache_root + '/' + subdir; |
| *dalvik_cache_exists = OS::DirectoryExists(dalvik_cache->c_str()); |
| *is_global_cache = (android_data == kAndroidDataDefaultPath); |
| if (create_if_absent && !*dalvik_cache_exists && !*is_global_cache) { |
| // Don't create the system's /data/dalvik-cache/... because it needs special permissions. |
| *dalvik_cache_exists = ((mkdir(dalvik_cache_root.c_str(), 0700) == 0 || errno == EEXIST) && |
| (mkdir(dalvik_cache->c_str(), 0700) == 0 || errno == EEXIST)); |
| } |
| #endif |
| } |
| |
| // Returns a path formed by encoding the dex location into the filename. The path returned will be |
| // rooted at `cache_location`. |
| static bool GetLocationEncodedFilename(const char* location, |
| const char* cache_location, |
| std::string* filename, |
| std::string* error_msg) { |
| if (location[0] != '/') { |
| *error_msg = StringPrintf("Expected path in location to be absolute: %s", location); |
| return false; |
| } |
| std::string cache_file(&location[1]); // skip leading slash |
| if (!android::base::EndsWith(location, ".dex") && |
| !android::base::EndsWith(location, ".art") && |
| !android::base::EndsWith(location, ".oat")) { |
| cache_file += "/"; |
| cache_file += kClassesDex; |
| } |
| std::replace(cache_file.begin(), cache_file.end(), '/', '@'); |
| *filename = StringPrintf("%s/%s", cache_location, cache_file.c_str()); |
| return true; |
| } |
| |
| bool GetDalvikCacheFilename(const char* location, |
| const char* cache_location, |
| std::string* filename, |
| std::string* error_msg) { |
| return GetLocationEncodedFilename(location, cache_location, filename, error_msg); |
| } |
| |
| std::string GetApexDataDalvikCacheDirectory(InstructionSet isa) { |
| if (isa != InstructionSet::kNone) { |
| return GetDalvikCacheDirectory(GetArtApexData(), GetInstructionSetString(isa)); |
| } |
| return GetDalvikCacheDirectory(GetArtApexData()); |
| } |
| |
| static std::string GetApexDataDalvikCacheFilename(std::string_view dex_location, |
| InstructionSet isa, |
| bool is_boot_classpath_location, |
| std::string_view file_extension) { |
| if (LocationIsOnApex(dex_location) && is_boot_classpath_location) { |
| // We don't compile boot images for updatable APEXes. |
| return {}; |
| } |
| std::string apex_data_dalvik_cache = GetApexDataDalvikCacheDirectory(isa); |
| if (!is_boot_classpath_location) { |
| // Arguments: "/system/framework/xyz.jar", "arm", true, "odex" |
| // Result: |
| // "/data/misc/apexdata/com.android.art/dalvik-cache/arm/system@framework@xyz.jar@classes.odex" |
| std::string result, unused_error_msg; |
| GetDalvikCacheFilename(std::string{dex_location}.c_str(), |
| apex_data_dalvik_cache.c_str(), |
| &result, |
| &unused_error_msg); |
| return ReplaceFileExtension(result, file_extension); |
| } else { |
| // Arguments: "/system/framework/xyz.jar", "x86_64", false, "art" |
| // Results: "/data/misc/apexdata/com.android.art/dalvik-cache/x86_64/boot-xyz.jar@classes.art" |
| std::string basename = android::base::Basename(std::string{dex_location}); |
| return apex_data_dalvik_cache + "/boot-" + ReplaceFileExtension(basename, file_extension); |
| } |
| } |
| |
| std::string GetApexDataOatFilename(std::string_view location, InstructionSet isa) { |
| return GetApexDataDalvikCacheFilename(location, isa, /*is_boot_classpath_location=*/true, "oat"); |
| } |
| |
| std::string GetApexDataOdexFilename(std::string_view location, InstructionSet isa) { |
| return GetApexDataDalvikCacheFilename( |
| location, isa, /*is_boot_classpath_location=*/false, "odex"); |
| } |
| |
| std::string GetApexDataBootImage(std::string_view dex_location) { |
| return GetApexDataDalvikCacheFilename(dex_location, |
| InstructionSet::kNone, |
| /*is_boot_classpath_location=*/true, |
| kArtImageExtension); |
| } |
| |
| std::string GetApexDataImage(std::string_view dex_location) { |
| return GetApexDataDalvikCacheFilename(dex_location, |
| InstructionSet::kNone, |
| /*is_boot_classpath_location=*/false, |
| kArtImageExtension); |
| } |
| |
| std::string GetApexDataDalvikCacheFilename(std::string_view dex_location, |
| InstructionSet isa, |
| std::string_view file_extension) { |
| return GetApexDataDalvikCacheFilename( |
| dex_location, isa, /*is_boot_classpath_location=*/false, file_extension); |
| } |
| |
| std::string GetVdexFilename(const std::string& oat_location) { |
| return ReplaceFileExtension(oat_location, "vdex"); |
| } |
| |
| std::string GetDmFilename(const std::string& dex_location) { |
| return ReplaceFileExtension(dex_location, "dm"); |
| } |
| |
| std::string GetSystemOdexFilenameForApex(std::string_view location, InstructionSet isa) { |
| DCHECK(LocationIsOnApex(location)); |
| std::string dir = GetAndroidRoot() + "/framework/oat/" + GetInstructionSetString(isa); |
| std::string result, error_msg; |
| bool ret = |
| GetLocationEncodedFilename(std::string{location}.c_str(), dir.c_str(), &result, &error_msg); |
| // This should never fail. The function fails only if the location is not absolute, and a location |
| // on /apex is always absolute. |
| DCHECK(ret) << error_msg; |
| return ReplaceFileExtension(result, "odex"); |
| } |
| |
| static void InsertIsaDirectory(const InstructionSet isa, std::string* filename) { |
| // in = /foo/bar/baz |
| // out = /foo/bar/<isa>/baz |
| size_t pos = filename->rfind('/'); |
| CHECK_NE(pos, std::string::npos) << *filename << " " << isa; |
| filename->insert(pos, "/", 1); |
| filename->insert(pos + 1, GetInstructionSetString(isa)); |
| } |
| |
| std::string GetSystemImageFilename(const char* location, const InstructionSet isa) { |
| // location = /system/framework/boot.art |
| // filename = /system/framework/<isa>/boot.art |
| std::string filename(location); |
| InsertIsaDirectory(isa, &filename); |
| return filename; |
| } |
| |
| std::string ReplaceFileExtension(std::string_view filename, std::string_view new_extension) { |
| const size_t last_ext = filename.find_last_of("./"); |
| std::string result; |
| if (last_ext == std::string::npos || filename[last_ext] != '.') { |
| result.reserve(filename.size() + 1 + new_extension.size()); |
| result.append(filename).append(".").append(new_extension); |
| } else { |
| result.reserve(last_ext + 1 + new_extension.size()); |
| result.append(filename.substr(0, last_ext + 1)).append(new_extension); |
| } |
| return result; |
| } |
| |
| bool LocationIsOnArtApexData(std::string_view location) { |
| const std::string art_apex_data = GetArtApexData(); |
| return android::base::StartsWith(location, art_apex_data); |
| } |
| |
| bool LocationIsOnArtModule(std::string_view full_path) { |
| std::string unused_error_msg; |
| std::string module_path = GetArtRootSafe(/* must_exist= */ kIsTargetBuild, &unused_error_msg); |
| if (module_path.empty()) { |
| return false; |
| } |
| return android::base::StartsWith(full_path, module_path); |
| } |
| |
| static bool StartsWithSlash(const char* str) { |
| DCHECK(str != nullptr); |
| return str[0] == '/'; |
| } |
| |
| static bool EndsWithSlash(const char* str) { |
| DCHECK(str != nullptr); |
| size_t len = strlen(str); |
| return len > 0 && str[len - 1] == '/'; |
| } |
| |
| // Returns true if `full_path` is located in folder either provided with `env_var` |
| // or in `default_path` otherwise. The caller may optionally provide a `subdir` |
| // which will be appended to the tested prefix. |
| // `default_path` and the value of environment variable `env_var` |
| // are expected to begin with a slash and not end with one. If this ever changes, |
| // the path-building logic should be updated. |
| static bool IsLocationOn(std::string_view full_path, |
| const char* env_var, |
| const char* default_path, |
| const char* subdir = nullptr) { |
| std::string unused_error_msg; |
| const char* path = GetAndroidDirSafe(env_var, |
| default_path, |
| /* must_exist= */ kIsTargetBuild, |
| &unused_error_msg); |
| if (path == nullptr) { |
| return false; |
| } |
| |
| // Build the path which we will check is a prefix of `full_path`. The prefix must |
| // end with a slash, so that "/foo/bar" does not match "/foo/barz". |
| DCHECK(StartsWithSlash(path)) << path; |
| std::string path_prefix(path); |
| if (!EndsWithSlash(path_prefix.c_str())) { |
| path_prefix.append("/"); |
| } |
| if (subdir != nullptr) { |
| // If `subdir` is provided, we assume it is provided without a starting slash |
| // but ending with one, e.g. "sub/dir/". `path_prefix` ends with a slash at |
| // this point, so we simply append `subdir`. |
| DCHECK(!StartsWithSlash(subdir) && EndsWithSlash(subdir)) << subdir; |
| path_prefix.append(subdir); |
| } |
| |
| return android::base::StartsWith(full_path, path_prefix); |
| } |
| |
| bool LocationIsOnSystemFramework(std::string_view full_path) { |
| return IsLocationOn(full_path, |
| kAndroidRootEnvVar, |
| kAndroidRootDefaultPath, |
| /* subdir= */ "framework/"); |
| } |
| |
| bool LocationIsOnSystemExtFramework(std::string_view full_path) { |
| return IsLocationOn(full_path, |
| kAndroidSystemExtRootEnvVar, |
| kAndroidSystemExtRootDefaultPath, |
| /* subdir= */ "framework/") || |
| // When the 'system_ext' partition is not present, builds will create |
| // '/system/system_ext' instead. |
| IsLocationOn(full_path, |
| kAndroidRootEnvVar, |
| kAndroidRootDefaultPath, |
| /* subdir= */ "system_ext/framework/"); |
| } |
| |
| bool LocationIsOnConscryptModule(std::string_view full_path) { |
| return IsLocationOn( |
| full_path, kAndroidConscryptRootEnvVar, kAndroidConscryptApexDefaultPath); |
| } |
| |
| bool LocationIsOnI18nModule(std::string_view full_path) { |
| return IsLocationOn( |
| full_path, kAndroidI18nRootEnvVar, kAndroidI18nApexDefaultPath); |
| } |
| |
| bool LocationIsOnApex(std::string_view full_path) { |
| return android::base::StartsWith(full_path, kApexDefaultPath); |
| } |
| |
| bool LocationIsOnSystem(const std::string& location) { |
| #ifdef _WIN32 |
| UNUSED(location); |
| LOG(FATAL) << "LocationIsOnSystem is unsupported on Windows."; |
| return false; |
| #else |
| return android::base::StartsWith(location, GetAndroidRoot().c_str()); |
| #endif |
| } |
| |
| bool LocationIsTrusted(const std::string& location, bool trust_art_apex_data_files) { |
| if (LocationIsOnSystem(location) || LocationIsOnArtModule(location)) { |
| return true; |
| } |
| return LocationIsOnArtApexData(location) & trust_art_apex_data_files; |
| } |
| |
| bool ArtModuleRootDistinctFromAndroidRoot() { |
| std::string error_msg; |
| const char* android_root = GetAndroidDirSafe(kAndroidRootEnvVar, |
| kAndroidRootDefaultPath, |
| /* must_exist= */ kIsTargetBuild, |
| &error_msg); |
| const char* art_root = GetAndroidDirSafe(kAndroidArtRootEnvVar, |
| kAndroidArtApexDefaultPath, |
| /* must_exist= */ kIsTargetBuild, |
| &error_msg); |
| return (android_root != nullptr) |
| && (art_root != nullptr) |
| && (std::string_view(android_root) != std::string_view(art_root)); |
| } |
| |
| int DupCloexec(int fd) { |
| #if defined(__linux__) |
| return fcntl(fd, F_DUPFD_CLOEXEC, 0); |
| #else |
| return dup(fd); |
| #endif |
| } |
| |
| } // namespace art |
