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/*
* 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 <sys/cdefs.h>
#include <unistd.h>
#include <functional>
#include "Binder.h"
#include "log.h"
__BEGIN_DECLS
// Weak undefined references to the symbols in libbinder and libhwbinder
// so that libmemunreachable can call them in processes that have them
// loaded without requiring libmemunreachable to have dependencies on them.
ssize_t __attribute__((weak)) getBinderKernelReferences(size_t, uintptr_t*);
ssize_t __attribute__((weak)) getHWBinderKernelReferences(size_t, uintptr_t*);
__END_DECLS
namespace android {
static bool BinderReferencesToVector(allocator::vector<uintptr_t>& refs,
std::function<ssize_t(size_t, uintptr_t*)> fn) {
if (fn == nullptr) {
return true;
}
size_t size = refs.size();
do {
refs.resize(size);
ssize_t ret = fn(refs.size(), refs.data());
if (ret < 0) {
return false;
}
size = ret;
} while (size > refs.size());
refs.resize(size);
return true;
}
bool BinderReferences(allocator::vector<uintptr_t>& refs) {
refs.clear();
allocator::vector<uintptr_t> binder_refs{refs.get_allocator()};
if (BinderReferencesToVector(refs, getBinderKernelReferences)) {
refs.insert(refs.end(), binder_refs.begin(), binder_refs.end());
} else {
MEM_ALOGE("getBinderKernelReferences failed");
}
allocator::vector<uintptr_t> hwbinder_refs{refs.get_allocator()};
if (BinderReferencesToVector(hwbinder_refs, getHWBinderKernelReferences)) {
refs.insert(refs.end(), hwbinder_refs.begin(), hwbinder_refs.end());
} else {
MEM_ALOGE("getHWBinderKernelReferences failed");
}
return true;
}
} // namespace android
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