105 lines
3.5 KiB
C++
105 lines
3.5 KiB
C++
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// Copyright 2019 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/android/bundle_utils.h"
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#include <android/dlext.h>
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#include <dlfcn.h>
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#include "base/android/jni_android.h"
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#include "base/android/jni_string.h"
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#include "base/base_jni_headers/BundleUtils_jni.h"
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#include "base/files/file_path.h"
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#include "base/logging.h"
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// These symbols are added by the lld linker when creating a partitioned shared
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// library. The symbols live in the base library, and are used to properly load
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// the other partitions (feature libraries) when needed.
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struct PartitionIndexEntry {
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int32_t name_relptr;
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int32_t addr_relptr;
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uint32_t size;
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};
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static_assert(sizeof(PartitionIndexEntry) == 12U,
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"Unexpected PartitionIndexEntry size");
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// Marked as weak_import because these symbols are lld-specific. The method that
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// uses them will only be invoked in builds that have lld-generated partitions.
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extern PartitionIndexEntry __part_index_begin[] __attribute__((weak_import));
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extern PartitionIndexEntry __part_index_end[] __attribute__((weak_import));
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extern "C" {
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// Marked as weak_import because this symbol is either supplied by the system
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// (on Android N+), or by Crazy Linker (Android M and prior).
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extern void* android_dlopen_ext(const char* __filename,
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int __flags,
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const android_dlextinfo* __info)
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__attribute__((weak_import));
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} // extern "C"
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namespace base {
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namespace android {
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namespace {
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const void* ReadRelPtr(const int32_t* relptr) {
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return reinterpret_cast<const char*>(relptr) + *relptr;
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}
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} // namespace
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// static
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std::string BundleUtils::ResolveLibraryPath(const std::string& library_name) {
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JNIEnv* env = AttachCurrentThread();
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ScopedJavaLocalRef<jstring> java_path = Java_BundleUtils_getNativeLibraryPath(
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env, base::android::ConvertUTF8ToJavaString(env, library_name));
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// TODO(https://crbug.com/1019853): Remove this tolerance.
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if (!java_path) {
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return std::string();
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}
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return base::android::ConvertJavaStringToUTF8(env, java_path);
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}
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// static
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bool BundleUtils::IsBundle() {
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return Java_BundleUtils_isBundleForNative(
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base::android::AttachCurrentThread());
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}
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// static
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void* BundleUtils::DlOpenModuleLibraryPartition(const std::string& library_name,
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const std::string& partition) {
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// TODO(https://crbug.com/1019853): Remove this tolerance.
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std::string library_path = ResolveLibraryPath(library_name);
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if (library_path.empty()) {
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return nullptr;
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}
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// Linear search is required here because the partition descriptors are not
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// ordered. If a large number of partitions come into existence, lld could be
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// modified to sort the partitions.
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DCHECK(__part_index_begin != nullptr);
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DCHECK(__part_index_end != nullptr);
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for (const PartitionIndexEntry* part = __part_index_begin;
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part != __part_index_end; ++part) {
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std::string name(
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reinterpret_cast<const char*>(ReadRelPtr(&part->name_relptr)));
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if (name == partition) {
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android_dlextinfo info = {};
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info.flags = ANDROID_DLEXT_RESERVED_ADDRESS;
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info.reserved_addr = const_cast<void*>(ReadRelPtr(&part->addr_relptr));
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info.reserved_size = part->size;
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DCHECK(android_dlopen_ext != nullptr);
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return android_dlopen_ext(library_path.c_str(), RTLD_LOCAL, &info);
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}
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}
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NOTREACHED();
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return nullptr;
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}
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} // namespace android
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} // namespace base
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