1 /* 2 * Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classLoader.hpp" 27 #include "classfile/sharedPathsMiscInfo.hpp" 28 #include "logging/log.hpp" 29 #include "logging/logStream.hpp" 30 #include "memory/allocation.inline.hpp" 31 #include "memory/filemap.hpp" 32 #include "memory/metaspaceShared.hpp" 33 #include "memory/resourceArea.hpp" 34 #include "runtime/arguments.hpp" 35 #include "runtime/os.inline.hpp" 36 #include "utilities/ostream.hpp" 37 38 SharedPathsMiscInfo::SharedPathsMiscInfo() { 39 _app_offset = 0; 40 _buf_size = INITIAL_BUF_SIZE; 41 _cur_ptr = _buf_start = NEW_C_HEAP_ARRAY(char, _buf_size, mtClass); 42 _allocated = true; 43 } 44 45 SharedPathsMiscInfo::~SharedPathsMiscInfo() { 46 if (_allocated) { 47 FREE_C_HEAP_ARRAY(char, _buf_start); 48 } 49 } 50 51 void SharedPathsMiscInfo::add_path(const char* path, int type) { 52 log_info(class, path)("type=%s ", type_name(type)); 53 ClassLoader::trace_class_path("add misc shared path ", path); 54 write(path, strlen(path) + 1); 55 write_jint(jint(type)); 56 } 57 58 void SharedPathsMiscInfo::ensure_size(size_t needed_bytes) { 59 assert(_allocated, "cannot modify buffer during validation."); 60 int used = get_used_bytes(); 61 int target = used + int(needed_bytes); 62 if (target > _buf_size) { 63 _buf_size = _buf_size * 2 + (int)needed_bytes; 64 _buf_start = REALLOC_C_HEAP_ARRAY(char, _buf_start, _buf_size, mtClass); 65 _cur_ptr = _buf_start + used; 66 _end_ptr = _buf_start + _buf_size; 67 } 68 } 69 70 void SharedPathsMiscInfo::write(const void* ptr, size_t size) { 71 ensure_size(size); 72 memcpy(_cur_ptr, ptr, size); 73 _cur_ptr += size; 74 } 75 76 bool SharedPathsMiscInfo::read(void* ptr, size_t size) { 77 if (_cur_ptr + size <= _end_ptr) { 78 memcpy(ptr, _cur_ptr, size); 79 _cur_ptr += size; 80 return true; 81 } 82 return false; 83 } 84 85 bool SharedPathsMiscInfo::fail(const char* msg, const char* name) { 86 ClassLoader::trace_class_path(msg, name); 87 MetaspaceShared::set_archive_loading_failed(); 88 return false; 89 } 90 91 void SharedPathsMiscInfo::print_path(outputStream* out, int type, const char* path) { 92 switch (type) { 93 case BOOT_PATH: 94 out->print("Expecting BOOT path=%s", path); 95 break; 96 case NON_EXIST: 97 out->print("Expecting that %s does not exist", path); 98 break; 99 case APP_PATH: 100 ClassLoader::trace_class_path("Expecting -Djava.class.path=", path); 101 break; 102 default: 103 ShouldNotReachHere(); 104 } 105 } 106 107 bool SharedPathsMiscInfo::check() { 108 // The whole buffer must be 0 terminated so that we can use strlen and strcmp 109 // without fear. 110 _end_ptr -= sizeof(jint); 111 if (_cur_ptr >= _end_ptr) { 112 return fail("Truncated archive file header"); 113 } 114 if (*_end_ptr != 0) { 115 return fail("Corrupted archive file header"); 116 } 117 118 jshort cur_index = 0; 119 jshort max_cp_index = FileMapInfo::current_info()->header()->max_used_path_index(); 120 jshort module_paths_start_index = 121 FileMapInfo::current_info()->header()->app_module_paths_start_index(); 122 while (_cur_ptr < _end_ptr) { 123 jint type; 124 const char* path = _cur_ptr; 125 _cur_ptr += strlen(path) + 1; 126 127 if (!read_jint(&type)) { 128 return fail("Corrupted archive file header"); 129 } 130 LogTarget(Info, class, path) lt; 131 if (lt.is_enabled()) { 132 lt.print("type=%s ", type_name(type)); 133 LogStream ls(lt); 134 print_path(&ls, type, path); 135 ls.cr(); 136 } 137 // skip checking the class path(s) which was not referenced during CDS dump 138 if ((cur_index <= max_cp_index) || (cur_index >= module_paths_start_index)) { 139 if (!check(type, path)) { 140 if (!PrintSharedArchiveAndExit) { 141 return false; 142 } 143 } else { 144 ClassLoader::trace_class_path("ok"); 145 } 146 } else { 147 ClassLoader::trace_class_path("skipped check"); 148 } 149 cur_index++; 150 } 151 152 return true; 153 } 154 155 char* skip_first_path_entry(const char* path) { 156 size_t path_sep_len = strlen(os::path_separator()); 157 char* p = strstr((char*)path, os::path_separator()); 158 if (p != NULL) { 159 debug_only( { 160 size_t image_name_len = strlen(MODULES_IMAGE_NAME); 161 assert(strncmp(p - image_name_len, MODULES_IMAGE_NAME, image_name_len) == 0, 162 "first entry must be the modules image"); 163 } ); 164 p += path_sep_len; 165 } else { 166 debug_only( { 167 assert(ClassLoader::string_ends_with(path, MODULES_IMAGE_NAME), 168 "first entry must be the modules image"); 169 } ); 170 } 171 return p; 172 } 173 174 bool SharedPathsMiscInfo::check(jint type, const char* path) { 175 assert(UseSharedSpaces, "runtime only"); 176 switch (type) { 177 case BOOT_PATH: 178 { 179 // 180 // - Archive contains boot classes only - relaxed boot path check: 181 // Extra path elements appended to the boot path at runtime are allowed. 182 // 183 // - Archive contains application or platform classes - strict boot path check: 184 // Validate the entire runtime boot path, which must be compactible 185 // with the dump time boot path. Appending boot path at runtime is not 186 // allowed. 187 // 188 189 // The first entry in boot path is the modules_image (guaranteed by 190 // ClassLoader::setup_boot_search_path()). Skip the first entry. The 191 // path of the runtime modules_image may be different from the dump 192 // time path (e.g. the JDK image is copied to a different location 193 // after generating the shared archive), which is acceptable. For most 194 // common cases, the dump time boot path might contain modules_image only. 195 char* runtime_boot_path = Arguments::get_sysclasspath(); 196 char* rp = skip_first_path_entry(runtime_boot_path); 197 char* dp = skip_first_path_entry(path); 198 199 bool relaxed_check = !FileMapInfo::current_info()->header()->has_platform_or_app_classes(); 200 if (dp == NULL && rp == NULL) { 201 break; // ok, both runtime and dump time boot paths have modules_images only 202 } else if (dp == NULL && rp != NULL && relaxed_check) { 203 break; // ok, relaxed check, runtime has extra boot append path entries 204 } else if (dp != NULL && rp != NULL) { 205 size_t num; 206 size_t dp_len = strlen(dp); 207 size_t rp_len = strlen(rp); 208 if (rp_len >= dp_len) { 209 if (relaxed_check) { 210 // only check the leading entries in the runtime boot path, up to 211 // the length of the dump time boot path 212 num = dp_len; 213 } else { 214 // check the full runtime boot path, must match with dump time 215 num = rp_len; 216 } 217 218 if (os::file_name_strncmp(dp, rp, num) == 0) { 219 // make sure it is the end of an entry in the runtime boot path 220 if (rp[dp_len] == '\0' || rp[dp_len] == os::path_separator()[0]) { 221 break; // ok, runtime and dump time paths match 222 } 223 } 224 } 225 } 226 227 // The paths are different 228 return fail("[BOOT classpath mismatch, actual =", runtime_boot_path); 229 } 230 break; 231 case NON_EXIST: 232 { 233 struct stat st; 234 if (os::stat(path, &st) == 0) { 235 // The file actually exists 236 // But we want it to not exist -> fail 237 return fail("File must not exist"); 238 } 239 } 240 break; 241 case APP_PATH: 242 { 243 size_t len = strlen(path); 244 const char *appcp = Arguments::get_appclasspath(); 245 assert(appcp != NULL, "NULL app classpath"); 246 size_t appcp_len = strlen(appcp); 247 if (appcp_len < len) { 248 return fail("Run time APP classpath is shorter than the one at dump time: ", appcp); 249 } 250 // Prefix is OK: E.g., dump with -cp foo.jar, but run with -cp foo.jar:bar.jar. 251 if (os::file_name_strncmp(path, appcp, len) != 0) { 252 return fail("[APP classpath mismatch, actual: -Djava.class.path=", appcp); 253 } 254 if (appcp[len] != '\0' && appcp[len] != os::path_separator()[0]) { 255 return fail("Dump time APP classpath is not a proper prefix of run time APP classpath: ", appcp); 256 } 257 } 258 break; 259 default: 260 return fail("Corrupted archive file header"); 261 } 262 263 return true; 264 }