1 /* 2 * Copyright (C) 2007 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 <dlfcn.h> 18 #include <link.h> 19 #include <stdlib.h> 20 #include <stdbool.h> 21 #include <android/dlext.h> 22 23 // These functions are exported by the loader 24 // TODO(dimitry): replace these with reference to libc.so 25 26 __attribute__((__weak__, visibility("default"))) 27 void* __loader_dlopen(const char* filename, int flags, const void* caller_addr); 28 29 __attribute__((__weak__, visibility("default"))) 30 void* __loader_dlerror(); 31 32 __attribute__((__weak__, visibility("default"))) 33 void* __loader_dlsym(void* handle, const char* symbol, const void* caller_addr); 34 35 __attribute__((__weak__, visibility("default"))) 36 void* __loader_dlvsym(void* handle, 37 const char* symbol, 38 const char* version, 39 const void* caller_addr); 40 41 __attribute__((__weak__, visibility("default"))) 42 int __loader_dladdr(const void* addr, Dl_info* info); 43 44 __attribute__((__weak__, visibility("default"))) 45 int __loader_dlclose(void* handle); 46 47 #if defined(__arm__) 48 __attribute__((__weak__, visibility("default"))) 49 _Unwind_Ptr __loader_dl_unwind_find_exidx(_Unwind_Ptr pc, int* pcount); 50 #endif 51 52 __attribute__((__weak__, visibility("default"))) 53 int __loader_dl_iterate_phdr(int (*cb)(struct dl_phdr_info* info, size_t size, void* data), 54 void* data); 55 56 __attribute__((__weak__, visibility("default"))) 57 void __loader_android_get_LD_LIBRARY_PATH(char* buffer, size_t buffer_size); 58 59 __attribute__((__weak__, visibility("default"))) 60 void __loader_android_update_LD_LIBRARY_PATH(const char* ld_library_path); 61 62 __attribute__((__weak__, visibility("default"))) 63 void* __loader_android_dlopen_ext(const char* filename, 64 int flag, 65 const android_dlextinfo* extinfo, 66 const void* caller_addr); 67 68 __attribute__((__weak__, visibility("default"))) 69 void __loader_android_set_application_target_sdk_version(uint32_t target); 70 71 __attribute__((__weak__, visibility("default"))) 72 uint32_t __loader_android_get_application_target_sdk_version(); 73 74 __attribute__((__weak__, visibility("default"))) 75 bool __loader_android_init_anonymous_namespace(const char* shared_libs_sonames, 76 const char* library_search_path); 77 78 __attribute__((__weak__, visibility("default"))) 79 struct android_namespace_t* __loader_android_create_namespace( 80 const char* name, 81 const char* ld_library_path, 82 const char* default_library_path, 83 uint64_t type, 84 const char* permitted_when_isolated_path, 85 struct android_namespace_t* parent, 86 const void* caller_addr); 87 88 __attribute__((__weak__, visibility("default"))) 89 bool __loader_android_link_namespaces( 90 struct android_namespace_t* namespace_from, 91 struct android_namespace_t* namespace_to, 92 const char* shared_libs_sonames); 93 94 __attribute__((__weak__, visibility("default"))) 95 void __loader_android_dlwarning(void* obj, void (*f)(void*, const char*)); 96 97 __attribute__((__weak__, visibility("default"))) 98 struct android_namespace_t* __loader_android_get_exported_namespace(const char* name); 99 100 // Proxy calls to bionic loader 101 void* dlopen(const char* filename, int flag) { 102 const void* caller_addr = __builtin_return_address(0); 103 return __loader_dlopen(filename, flag, caller_addr); 104 } 105 106 char* dlerror() { 107 return __loader_dlerror(); 108 } 109 110 void* dlsym(void* handle, const char* symbol) { 111 const void* caller_addr = __builtin_return_address(0); 112 return __loader_dlsym(handle, symbol, caller_addr); 113 } 114 115 void* dlvsym(void* handle, const char* symbol, const char* version) { 116 const void* caller_addr = __builtin_return_address(0); 117 return __loader_dlvsym(handle, symbol, version, caller_addr); 118 } 119 120 int dladdr(const void* addr, Dl_info* info) { 121 return __loader_dladdr(addr, info); 122 } 123 124 int dlclose(void* handle) { 125 return __loader_dlclose(handle); 126 } 127 128 #if defined(__arm__) 129 _Unwind_Ptr dl_unwind_find_exidx(_Unwind_Ptr pc, int* pcount) { 130 return __loader_dl_unwind_find_exidx(pc, pcount); 131 } 132 #endif 133 134 int dl_iterate_phdr(int (*cb)(struct dl_phdr_info* info, size_t size, void* data), void* data) { 135 return __loader_dl_iterate_phdr(cb, data); 136 } 137 138 void android_get_LD_LIBRARY_PATH(char* buffer, size_t buffer_size) { 139 __loader_android_get_LD_LIBRARY_PATH(buffer, buffer_size); 140 } 141 142 void android_update_LD_LIBRARY_PATH(const char* ld_library_path) { 143 __loader_android_update_LD_LIBRARY_PATH(ld_library_path); 144 } 145 146 void* android_dlopen_ext(const char* filename, int flag, const android_dlextinfo* extinfo) { 147 const void* caller_addr = __builtin_return_address(0); 148 return __loader_android_dlopen_ext(filename, flag, extinfo, caller_addr); 149 } 150 151 void android_set_application_target_sdk_version(uint32_t target) { 152 __loader_android_set_application_target_sdk_version(target); 153 } 154 uint32_t android_get_application_target_sdk_version() { 155 return __loader_android_get_application_target_sdk_version(); 156 } 157 158 bool android_init_anonymous_namespace(const char* shared_libs_sonames, 159 const char* library_search_path) { 160 return __loader_android_init_anonymous_namespace(shared_libs_sonames, library_search_path); 161 } 162 163 struct android_namespace_t* android_create_namespace(const char* name, 164 const char* ld_library_path, 165 const char* default_library_path, 166 uint64_t type, 167 const char* permitted_when_isolated_path, 168 struct android_namespace_t* parent) { 169 const void* caller_addr = __builtin_return_address(0); 170 return __loader_android_create_namespace(name, 171 ld_library_path, 172 default_library_path, 173 type, 174 permitted_when_isolated_path, 175 parent, 176 caller_addr); 177 } 178 179 bool android_link_namespaces(struct android_namespace_t* namespace_from, 180 struct android_namespace_t* namespace_to, 181 const char* shared_libs_sonames) { 182 return __loader_android_link_namespaces(namespace_from, namespace_to, shared_libs_sonames); 183 } 184 185 void android_dlwarning(void* obj, void (*f)(void*, const char*)) { 186 __loader_android_dlwarning(obj, f); 187 } 188 189 struct android_namespace_t* android_get_exported_namespace(const char* name) { 190 return __loader_android_get_exported_namespace(name); 191 } 192
