1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <sys/cdefs.h> 18 #include <unistd.h> 19 20 #include <functional> 21 22 #include "Binder.h" 23 #include "log.h" 24 25 __BEGIN_DECLS 26 27 // Weak undefined references to the symbols in libbinder and libhwbinder 28 // so that libmemunreachable can call them in processes that have them 29 // loaded without requiring libmemunreachable to have dependencies on them. 30 ssize_t __attribute__((weak)) getBinderKernelReferences(size_t, uintptr_t*); 31 ssize_t __attribute__((weak)) getHWBinderKernelReferences(size_t, uintptr_t*); 32 33 __END_DECLS 34 35 namespace android { 36 37 static bool BinderReferencesToVector(allocator::vector<uintptr_t>& refs, 38 std::function<ssize_t(size_t, uintptr_t*)> fn) { 39 if (fn == nullptr) { 40 return true; 41 } 42 43 size_t size = refs.size(); 44 45 do { 46 refs.resize(size); 47 48 ssize_t ret = fn(refs.size(), refs.data()); 49 if (ret < 0) { 50 return false; 51 } 52 53 size = ret; 54 } while (size > refs.size()); 55 56 refs.resize(size); 57 return true; 58 } 59 60 bool BinderReferences(allocator::vector<uintptr_t>& refs) { 61 refs.clear(); 62 63 allocator::vector<uintptr_t> binder_refs{refs.get_allocator()}; 64 if (BinderReferencesToVector(refs, getBinderKernelReferences)) { 65 refs.insert(refs.end(), binder_refs.begin(), binder_refs.end()); 66 } else { 67 MEM_ALOGE("getBinderKernelReferences failed"); 68 } 69 70 allocator::vector<uintptr_t> hwbinder_refs{refs.get_allocator()}; 71 if (BinderReferencesToVector(hwbinder_refs, getHWBinderKernelReferences)) { 72 refs.insert(refs.end(), hwbinder_refs.begin(), hwbinder_refs.end()); 73 } else { 74 MEM_ALOGE("getHWBinderKernelReferences failed"); 75 } 76 77 return true; 78 } 79 80 } // namespace android 81
