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 while (_cur_ptr < _end_ptr) { 119 jint type; 120 const char* path = _cur_ptr; 121 _cur_ptr += strlen(path) + 1; 122 if (!read_jint(&type)) { 123 return fail("Corrupted archive file header"); 124 } 125 LogTarget(Info, class, path) lt; 126 if (lt.is_enabled()) { 127 lt.print("type=%s ", type_name(type)); 128 LogStream ls(lt); 129 print_path(&ls, type, path); 130 ls.cr(); 131 } 132 if (!check(type, path)) { 133 if (!PrintSharedArchiveAndExit) { 134 return false; 135 } 136 } else { 137 ClassLoader::trace_class_path("ok"); 138 } 139 } 140 141 return true; 142 } 143 144 char* skip_first_path_entry(const char* path) { 145 size_t path_sep_len = strlen(os::path_separator()); 146 char* p = strstr((char*)path, os::path_separator()); 147 if (p != NULL) { 148 debug_only( { 149 size_t image_name_len = strlen(MODULES_IMAGE_NAME); 150 assert(strncmp(p - image_name_len, MODULES_IMAGE_NAME, image_name_len) == 0, 151 "first entry must be the modules image"); 152 } ); 153 p += path_sep_len; 154 } else { 155 debug_only( { 156 assert(ClassLoader::string_ends_with(path, MODULES_IMAGE_NAME), 157 "first entry must be the modules image"); 158 } ); 159 } 160 return p; 161 } 162 163 bool SharedPathsMiscInfo::check(jint type, const char* path) { 164 assert(UseSharedSpaces, "runtime only"); 165 switch (type) { 166 case BOOT_PATH: 167 { 168 // 169 // - Archive contains boot classes only - relaxed boot path check: 170 // Extra path elements appended to the boot path at runtime are allowed. 171 // 172 // - Archive contains application or platform classes - strict boot path check: 173 // Validate the entire runtime boot path, which must be compactible 174 // with the dump time boot path. Appending boot path at runtime is not 175 // allowed. 176 // 177 178 // The first entry in boot path is the modules_image (guaranteed by 179 // ClassLoader::setup_boot_search_path()). Skip the first entry. The 180 // path of the runtime modules_image may be different from the dump 181 // time path (e.g. the JDK image is copied to a different location 182 // after generating the shared archive), which is acceptable. For most 183 // common cases, the dump time boot path might contain modules_image only. 184 char* runtime_boot_path = Arguments::get_sysclasspath(); 185 char* rp = skip_first_path_entry(runtime_boot_path); 186 char* dp = skip_first_path_entry(path); 187 188 bool relaxed_check = !FileMapInfo::current_info()->header()->has_platform_or_app_classes(); 189 if (dp == NULL && rp == NULL) { 190 break; // ok, both runtime and dump time boot paths have modules_images only 191 } else if (dp == NULL && rp != NULL && relaxed_check) { 192 break; // ok, relaxed check, runtime has extra boot append path entries 193 } else if (dp != NULL && rp != NULL) { 194 size_t num; 195 size_t dp_len = strlen(dp); 196 size_t rp_len = strlen(rp); 197 if (rp_len >= dp_len) { 198 if (relaxed_check) { 199 // only check the leading entries in the runtime boot path, up to 200 // the length of the dump time boot path 201 num = dp_len; 202 } else { 203 // check the full runtime boot path, must match with dump time 204 num = rp_len; 205 } 206 207 if (os::file_name_strncmp(dp, rp, num) == 0) { 208 // make sure it is the end of an entry in the runtime boot path 209 if (rp[dp_len] == '\0' || rp[dp_len] == os::path_separator()[0]) { 210 break; // ok, runtime and dump time paths match 211 } 212 } 213 } 214 } 215 216 // The paths are different 217 return fail("[BOOT classpath mismatch, actual =", runtime_boot_path); 218 } 219 break; 220 case NON_EXIST: 221 { 222 struct stat st; 223 if (os::stat(path, &st) == 0) { 224 // The file actually exists 225 // But we want it to not exist -> fail 226 return fail("File must not exist"); 227 } 228 } 229 break; 230 case APP_PATH: 231 { 232 size_t len = strlen(path); 233 const char *appcp = Arguments::get_appclasspath(); 234 assert(appcp != NULL, "NULL app classpath"); 235 size_t appcp_len = strlen(appcp); 236 if (appcp_len < len) { 237 return fail("Run time APP classpath is shorter than the one at dump time: ", appcp); 238 } 239 // Prefix is OK: E.g., dump with -cp foo.jar, but run with -cp foo.jar:bar.jar. 240 if (os::file_name_strncmp(path, appcp, len) != 0) { 241 return fail("[APP classpath mismatch, actual: -Djava.class.path=", appcp); 242 } 243 if (appcp[len] != '\0' && appcp[len] != os::path_separator()[0]) { 244 return fail("Dump time APP classpath is not a proper prefix of run time APP classpath: ", appcp); 245 } 246 } 247 break; 248 default: 249 return fail("Corrupted archive file header"); 250 } 251 252 return true; 253 }