/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <sys/cdefs.h>
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#include <unistd.h>
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#include <functional>
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#include "Binder.h"
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#include "log.h"
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__BEGIN_DECLS
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// Weak undefined references to the symbols in libbinder and libhwbinder
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// so that libmemunreachable can call them in processes that have them
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// loaded without requiring libmemunreachable to have dependencies on them.
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ssize_t __attribute__((weak)) getBinderKernelReferences(size_t, uintptr_t*);
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ssize_t __attribute__((weak)) getHWBinderKernelReferences(size_t, uintptr_t*);
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__END_DECLS
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namespace android {
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static bool BinderReferencesToVector(allocator::vector<uintptr_t>& refs,
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std::function<ssize_t(size_t, uintptr_t*)> fn) {
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if (fn == nullptr) {
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return true;
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}
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size_t size = refs.size();
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do {
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refs.resize(size);
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ssize_t ret = fn(refs.size(), refs.data());
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if (ret < 0) {
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return false;
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}
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size = ret;
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} while (size > refs.size());
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refs.resize(size);
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return true;
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}
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bool BinderReferences(allocator::vector<uintptr_t>& refs) {
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refs.clear();
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allocator::vector<uintptr_t> binder_refs{refs.get_allocator()};
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if (BinderReferencesToVector(refs, getBinderKernelReferences)) {
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refs.insert(refs.end(), binder_refs.begin(), binder_refs.end());
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} else {
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MEM_ALOGE("getBinderKernelReferences failed");
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}
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allocator::vector<uintptr_t> hwbinder_refs{refs.get_allocator()};
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if (BinderReferencesToVector(hwbinder_refs, getHWBinderKernelReferences)) {
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refs.insert(refs.end(), hwbinder_refs.begin(), hwbinder_refs.end());
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} else {
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MEM_ALOGE("getHWBinderKernelReferences failed");
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}
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return true;
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}
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} // namespace android
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