1 /*
2 * Copyright (c) 2014, 2019, 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
SharedPathsMiscInfo()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
~SharedPathsMiscInfo()45 SharedPathsMiscInfo::~SharedPathsMiscInfo() {
46 if (_allocated) {
47 FREE_C_HEAP_ARRAY(char, _buf_start);
48 }
49 }
50
add_path(const char * path,int type)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
ensure_size(size_t needed_bytes)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
write(const void * ptr,size_t size)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
read(void * ptr,size_t size)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
fail(const char * msg,const char * name)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
print_path(outputStream * out,int type,const char * path)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
check(bool is_static)107 bool SharedPathsMiscInfo::check(bool is_static) {
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 FileMapHeader* header = is_static ? FileMapInfo::current_info()->header() :
120 FileMapInfo::dynamic_info()->header();
121 jshort max_cp_index = header->max_used_path_index();
122 jshort module_paths_start_index = header->app_module_paths_start_index();
123 while (_cur_ptr < _end_ptr) {
124 jint type;
125 const char* path = _cur_ptr;
126 _cur_ptr += strlen(path) + 1;
127
128 if (!read_jint(&type)) {
129 return fail("Corrupted archive file header");
130 }
131 LogTarget(Info, class, path) lt;
132 if (lt.is_enabled()) {
133 lt.print("type=%s ", type_name(type));
134 LogStream ls(lt);
135 print_path(&ls, type, path);
136 ls.cr();
137 }
138 // skip checking the class path(s) which was not referenced during CDS dump
139 if ((cur_index <= max_cp_index) || (cur_index >= module_paths_start_index)) {
140 if (!check(type, path, is_static)) {
141 if (!PrintSharedArchiveAndExit) {
142 return false;
143 }
144 } else {
145 ClassLoader::trace_class_path("ok");
146 }
147 } else {
148 ClassLoader::trace_class_path("skipped check");
149 }
150 cur_index++;
151 }
152
153 return true;
154 }
155
skip_first_path_entry(const char * path)156 char* skip_first_path_entry(const char* path) {
157 size_t path_sep_len = strlen(os::path_separator());
158 char* p = strstr((char*)path, os::path_separator());
159 if (p != NULL) {
160 debug_only( {
161 size_t image_name_len = strlen(MODULES_IMAGE_NAME);
162 assert(strncmp(p - image_name_len, MODULES_IMAGE_NAME, image_name_len) == 0,
163 "first entry must be the modules image");
164 } );
165 p += path_sep_len;
166 } else {
167 debug_only( {
168 assert(ClassLoader::string_ends_with(path, MODULES_IMAGE_NAME),
169 "first entry must be the modules image");
170 } );
171 }
172 return p;
173 }
174
check(jint type,const char * path,bool is_static)175 bool SharedPathsMiscInfo::check(jint type, const char* path, bool is_static) {
176 assert(UseSharedSpaces, "runtime only");
177 switch (type) {
178 case BOOT_PATH:
179 {
180 //
181 // - Archive contains boot classes only - relaxed boot path check:
182 // Extra path elements appended to the boot path at runtime are allowed.
183 //
184 // - Archive contains application or platform classes - strict boot path check:
185 // Validate the entire runtime boot path, which must be compactible
186 // with the dump time boot path. Appending boot path at runtime is not
187 // allowed.
188 //
189
190 // The first entry in boot path is the modules_image (guaranteed by
191 // ClassLoader::setup_boot_search_path()). Skip the first entry. The
192 // path of the runtime modules_image may be different from the dump
193 // time path (e.g. the JDK image is copied to a different location
194 // after generating the shared archive), which is acceptable. For most
195 // common cases, the dump time boot path might contain modules_image only.
196 char* runtime_boot_path = Arguments::get_sysclasspath();
197 char* rp = skip_first_path_entry(runtime_boot_path);
198 char* dp = skip_first_path_entry(path);
199
200 bool relaxed_check = is_static ?
201 !FileMapInfo::current_info()->header()->has_platform_or_app_classes() :
202 !FileMapInfo::dynamic_info()->header()->has_platform_or_app_classes();
203 if (dp == NULL && rp == NULL) {
204 break; // ok, both runtime and dump time boot paths have modules_images only
205 } else if (dp == NULL && rp != NULL && relaxed_check) {
206 break; // ok, relaxed check, runtime has extra boot append path entries
207 } else if (dp != NULL && rp != NULL) {
208 size_t num;
209 size_t dp_len = strlen(dp);
210 size_t rp_len = strlen(rp);
211 if (rp_len >= dp_len) {
212 if (relaxed_check) {
213 // only check the leading entries in the runtime boot path, up to
214 // the length of the dump time boot path
215 num = dp_len;
216 } else {
217 // check the full runtime boot path, must match with dump time
218 num = rp_len;
219 }
220
221 if (os::file_name_strncmp(dp, rp, num) == 0) {
222 // make sure it is the end of an entry in the runtime boot path
223 if (rp[dp_len] == '\0' || rp[dp_len] == os::path_separator()[0]) {
224 break; // ok, runtime and dump time paths match
225 }
226 }
227 }
228 }
229
230 // The paths are different
231 return fail("[BOOT classpath mismatch, actual =", runtime_boot_path);
232 }
233 break;
234 case NON_EXIST:
235 {
236 struct stat st;
237 if (os::stat(path, &st) == 0) {
238 // The file actually exists
239 // But we want it to not exist -> fail
240 return fail("File must not exist");
241 }
242 }
243 break;
244 case APP_PATH:
245 {
246 size_t len = strlen(path);
247 const char *appcp = Arguments::get_appclasspath();
248 assert(appcp != NULL, "NULL app classpath");
249 size_t appcp_len = strlen(appcp);
250 if (appcp_len < len) {
251 return fail("Run time APP classpath is shorter than the one at dump time: ", appcp);
252 }
253 // Prefix is OK: E.g., dump with -cp foo.jar, but run with -cp foo.jar:bar.jar.
254 if (os::file_name_strncmp(path, appcp, len) != 0) {
255 return fail("[APP classpath mismatch, actual: -Djava.class.path=", appcp);
256 }
257 if (appcp[len] != '\0' && appcp[len] != os::path_separator()[0]) {
258 return fail("Dump time APP classpath is not a proper prefix of run time APP classpath: ", appcp);
259 }
260 }
261 break;
262 default:
263 return fail("Corrupted archive file header");
264 }
265
266 return true;
267 }
268