Mercurial > hg > truffle
annotate src/os/windows/vm/perfMemory_windows.cpp @ 5987:748051fd24ce
7130974: G1: Remove G1ParCopyHelper
Reviewed-by: tonyp, johnc
author | brutisso |
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date | Fri, 16 Mar 2012 09:52:57 +0100 |
parents | de14f1eee390 |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/vmSymbols.hpp" | |
27 #include "memory/allocation.inline.hpp" | |
28 #include "memory/resourceArea.hpp" | |
29 #include "oops/oop.inline.hpp" | |
30 #include "os_windows.inline.hpp" | |
31 #include "runtime/handles.inline.hpp" | |
32 #include "runtime/perfMemory.hpp" | |
33 #include "utilities/exceptions.hpp" | |
0 | 34 |
35 #include <windows.h> | |
36 #include <sys/types.h> | |
37 #include <sys/stat.h> | |
38 #include <errno.h> | |
39 #include <lmcons.h> | |
40 | |
41 typedef BOOL (WINAPI *SetSecurityDescriptorControlFnPtr)( | |
42 IN PSECURITY_DESCRIPTOR pSecurityDescriptor, | |
43 IN SECURITY_DESCRIPTOR_CONTROL ControlBitsOfInterest, | |
44 IN SECURITY_DESCRIPTOR_CONTROL ControlBitsToSet); | |
45 | |
46 // Standard Memory Implementation Details | |
47 | |
48 // create the PerfData memory region in standard memory. | |
49 // | |
50 static char* create_standard_memory(size_t size) { | |
51 | |
52 // allocate an aligned chuck of memory | |
53 char* mapAddress = os::reserve_memory(size); | |
54 | |
55 if (mapAddress == NULL) { | |
56 return NULL; | |
57 } | |
58 | |
59 // commit memory | |
60 if (!os::commit_memory(mapAddress, size)) { | |
61 if (PrintMiscellaneous && Verbose) { | |
62 warning("Could not commit PerfData memory\n"); | |
63 } | |
64 os::release_memory(mapAddress, size); | |
65 return NULL; | |
66 } | |
67 | |
68 return mapAddress; | |
69 } | |
70 | |
71 // delete the PerfData memory region | |
72 // | |
73 static void delete_standard_memory(char* addr, size_t size) { | |
74 | |
75 // there are no persistent external resources to cleanup for standard | |
76 // memory. since DestroyJavaVM does not support unloading of the JVM, | |
77 // cleanup of the memory resource is not performed. The memory will be | |
78 // reclaimed by the OS upon termination of the process. | |
79 // | |
80 return; | |
81 | |
82 } | |
83 | |
84 // save the specified memory region to the given file | |
85 // | |
86 static void save_memory_to_file(char* addr, size_t size) { | |
87 | |
88 const char* destfile = PerfMemory::get_perfdata_file_path(); | |
89 assert(destfile[0] != '\0', "invalid Perfdata file path"); | |
90 | |
91 int fd = ::_open(destfile, _O_BINARY|_O_CREAT|_O_WRONLY|_O_TRUNC, | |
92 _S_IREAD|_S_IWRITE); | |
93 | |
94 if (fd == OS_ERR) { | |
95 if (PrintMiscellaneous && Verbose) { | |
96 warning("Could not create Perfdata save file: %s: %s\n", | |
97 destfile, strerror(errno)); | |
98 } | |
99 } else { | |
100 for (size_t remaining = size; remaining > 0;) { | |
101 | |
102 int nbytes = ::_write(fd, addr, (unsigned int)remaining); | |
103 if (nbytes == OS_ERR) { | |
104 if (PrintMiscellaneous && Verbose) { | |
105 warning("Could not write Perfdata save file: %s: %s\n", | |
106 destfile, strerror(errno)); | |
107 } | |
108 break; | |
109 } | |
110 | |
111 remaining -= (size_t)nbytes; | |
112 addr += nbytes; | |
113 } | |
114 | |
115 int result = ::_close(fd); | |
116 if (PrintMiscellaneous && Verbose) { | |
117 if (result == OS_ERR) { | |
118 warning("Could not close %s: %s\n", destfile, strerror(errno)); | |
119 } | |
120 } | |
121 } | |
122 | |
123 FREE_C_HEAP_ARRAY(char, destfile); | |
124 } | |
125 | |
126 // Shared Memory Implementation Details | |
127 | |
128 // Note: the win32 shared memory implementation uses two objects to represent | |
129 // the shared memory: a windows kernel based file mapping object and a backing | |
130 // store file. On windows, the name space for shared memory is a kernel | |
131 // based name space that is disjoint from other win32 name spaces. Since Java | |
132 // is unaware of this name space, a parallel file system based name space is | |
133 // maintained, which provides a common file system based shared memory name | |
134 // space across the supported platforms and one that Java apps can deal with | |
135 // through simple file apis. | |
136 // | |
137 // For performance and resource cleanup reasons, it is recommended that the | |
138 // user specific directory and the backing store file be stored in either a | |
139 // RAM based file system or a local disk based file system. Network based | |
140 // file systems are not recommended for performance reasons. In addition, | |
141 // use of SMB network based file systems may result in unsuccesful cleanup | |
142 // of the disk based resource on exit of the VM. The Windows TMP and TEMP | |
143 // environement variables, as used by the GetTempPath() Win32 API (see | |
144 // os::get_temp_directory() in os_win32.cpp), control the location of the | |
145 // user specific directory and the shared memory backing store file. | |
146 | |
147 static HANDLE sharedmem_fileMapHandle = NULL; | |
148 static HANDLE sharedmem_fileHandle = INVALID_HANDLE_VALUE; | |
149 static char* sharedmem_fileName = NULL; | |
150 | |
151 // return the user specific temporary directory name. | |
152 // | |
153 // the caller is expected to free the allocated memory. | |
154 // | |
155 static char* get_user_tmp_dir(const char* user) { | |
156 | |
157 const char* tmpdir = os::get_temp_directory(); | |
158 const char* perfdir = PERFDATA_NAME; | |
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159 size_t nbytes = strlen(tmpdir) + strlen(perfdir) + strlen(user) + 3; |
0 | 160 char* dirname = NEW_C_HEAP_ARRAY(char, nbytes); |
161 | |
162 // construct the path name to user specific tmp directory | |
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163 _snprintf(dirname, nbytes, "%s\\%s_%s", tmpdir, perfdir, user); |
0 | 164 |
165 return dirname; | |
166 } | |
167 | |
168 // convert the given file name into a process id. if the file | |
169 // does not meet the file naming constraints, return 0. | |
170 // | |
171 static int filename_to_pid(const char* filename) { | |
172 | |
173 // a filename that doesn't begin with a digit is not a | |
174 // candidate for conversion. | |
175 // | |
176 if (!isdigit(*filename)) { | |
177 return 0; | |
178 } | |
179 | |
180 // check if file name can be converted to an integer without | |
181 // any leftover characters. | |
182 // | |
183 char* remainder = NULL; | |
184 errno = 0; | |
185 int pid = (int)strtol(filename, &remainder, 10); | |
186 | |
187 if (errno != 0) { | |
188 return 0; | |
189 } | |
190 | |
191 // check for left over characters. If any, then the filename is | |
192 // not a candidate for conversion. | |
193 // | |
194 if (remainder != NULL && *remainder != '\0') { | |
195 return 0; | |
196 } | |
197 | |
198 // successful conversion, return the pid | |
199 return pid; | |
200 } | |
201 | |
202 // check if the given path is considered a secure directory for | |
203 // the backing store files. Returns true if the directory exists | |
204 // and is considered a secure location. Returns false if the path | |
605 | 205 // is a symbolic link or if an error occurred. |
0 | 206 // |
207 static bool is_directory_secure(const char* path) { | |
208 | |
209 DWORD fa; | |
210 | |
211 fa = GetFileAttributes(path); | |
212 if (fa == 0xFFFFFFFF) { | |
213 DWORD lasterror = GetLastError(); | |
214 if (lasterror == ERROR_FILE_NOT_FOUND) { | |
215 return false; | |
216 } | |
217 else { | |
218 // unexpected error, declare the path insecure | |
219 if (PrintMiscellaneous && Verbose) { | |
220 warning("could not get attributes for file %s: ", | |
221 " lasterror = %d\n", path, lasterror); | |
222 } | |
223 return false; | |
224 } | |
225 } | |
226 | |
227 if (fa & FILE_ATTRIBUTE_REPARSE_POINT) { | |
228 // we don't accept any redirection for the user specific directory | |
229 // so declare the path insecure. This may be too conservative, | |
230 // as some types of reparse points might be acceptable, but it | |
231 // is probably more secure to avoid these conditions. | |
232 // | |
233 if (PrintMiscellaneous && Verbose) { | |
234 warning("%s is a reparse point\n", path); | |
235 } | |
236 return false; | |
237 } | |
238 | |
239 if (fa & FILE_ATTRIBUTE_DIRECTORY) { | |
240 // this is the expected case. Since windows supports symbolic | |
241 // links to directories only, not to files, there is no need | |
242 // to check for open write permissions on the directory. If the | |
243 // directory has open write permissions, any files deposited that | |
244 // are not expected will be removed by the cleanup code. | |
245 // | |
246 return true; | |
247 } | |
248 else { | |
249 // this is either a regular file or some other type of file, | |
250 // any of which are unexpected and therefore insecure. | |
251 // | |
252 if (PrintMiscellaneous && Verbose) { | |
253 warning("%s is not a directory, file attributes = " | |
254 INTPTR_FORMAT "\n", path, fa); | |
255 } | |
256 return false; | |
257 } | |
258 } | |
259 | |
260 // return the user name for the owner of this process | |
261 // | |
262 // the caller is expected to free the allocated memory. | |
263 // | |
264 static char* get_user_name() { | |
265 | |
266 /* get the user name. This code is adapted from code found in | |
267 * the jdk in src/windows/native/java/lang/java_props_md.c | |
268 * java_props_md.c 1.29 02/02/06. According to the original | |
269 * source, the call to GetUserName is avoided because of a resulting | |
270 * increase in footprint of 100K. | |
271 */ | |
272 char* user = getenv("USERNAME"); | |
273 char buf[UNLEN+1]; | |
274 DWORD buflen = sizeof(buf); | |
275 if (user == NULL || strlen(user) == 0) { | |
276 if (GetUserName(buf, &buflen)) { | |
277 user = buf; | |
278 } | |
279 else { | |
280 return NULL; | |
281 } | |
282 } | |
283 | |
284 char* user_name = NEW_C_HEAP_ARRAY(char, strlen(user)+1); | |
285 strcpy(user_name, user); | |
286 | |
287 return user_name; | |
288 } | |
289 | |
290 // return the name of the user that owns the process identified by vmid. | |
291 // | |
292 // This method uses a slow directory search algorithm to find the backing | |
293 // store file for the specified vmid and returns the user name, as determined | |
294 // by the user name suffix of the hsperfdata_<username> directory name. | |
295 // | |
296 // the caller is expected to free the allocated memory. | |
297 // | |
298 static char* get_user_name_slow(int vmid) { | |
299 | |
300 // directory search | |
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301 char* latest_user = NULL; |
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302 time_t latest_ctime = 0; |
0 | 303 |
304 const char* tmpdirname = os::get_temp_directory(); | |
305 | |
306 DIR* tmpdirp = os::opendir(tmpdirname); | |
307 | |
308 if (tmpdirp == NULL) { | |
309 return NULL; | |
310 } | |
311 | |
312 // for each entry in the directory that matches the pattern hsperfdata_*, | |
313 // open the directory and check if the file for the given vmid exists. | |
314 // The file with the expected name and the latest creation date is used | |
315 // to determine the user name for the process id. | |
316 // | |
317 struct dirent* dentry; | |
318 char* tdbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(tmpdirname)); | |
319 errno = 0; | |
320 while ((dentry = os::readdir(tmpdirp, (struct dirent *)tdbuf)) != NULL) { | |
321 | |
322 // check if the directory entry is a hsperfdata file | |
323 if (strncmp(dentry->d_name, PERFDATA_NAME, strlen(PERFDATA_NAME)) != 0) { | |
324 continue; | |
325 } | |
326 | |
327 char* usrdir_name = NEW_C_HEAP_ARRAY(char, | |
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328 strlen(tmpdirname) + strlen(dentry->d_name) + 2); |
0 | 329 strcpy(usrdir_name, tmpdirname); |
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330 strcat(usrdir_name, "\\"); |
0 | 331 strcat(usrdir_name, dentry->d_name); |
332 | |
333 DIR* subdirp = os::opendir(usrdir_name); | |
334 | |
335 if (subdirp == NULL) { | |
336 FREE_C_HEAP_ARRAY(char, usrdir_name); | |
337 continue; | |
338 } | |
339 | |
340 // Since we don't create the backing store files in directories | |
341 // pointed to by symbolic links, we also don't follow them when | |
342 // looking for the files. We check for a symbolic link after the | |
343 // call to opendir in order to eliminate a small window where the | |
344 // symlink can be exploited. | |
345 // | |
346 if (!is_directory_secure(usrdir_name)) { | |
347 FREE_C_HEAP_ARRAY(char, usrdir_name); | |
348 os::closedir(subdirp); | |
349 continue; | |
350 } | |
351 | |
352 struct dirent* udentry; | |
353 char* udbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(usrdir_name)); | |
354 errno = 0; | |
355 while ((udentry = os::readdir(subdirp, (struct dirent *)udbuf)) != NULL) { | |
356 | |
357 if (filename_to_pid(udentry->d_name) == vmid) { | |
358 struct stat statbuf; | |
359 | |
360 char* filename = NEW_C_HEAP_ARRAY(char, | |
361 strlen(usrdir_name) + strlen(udentry->d_name) + 2); | |
362 | |
363 strcpy(filename, usrdir_name); | |
364 strcat(filename, "\\"); | |
365 strcat(filename, udentry->d_name); | |
366 | |
367 if (::stat(filename, &statbuf) == OS_ERR) { | |
368 FREE_C_HEAP_ARRAY(char, filename); | |
369 continue; | |
370 } | |
371 | |
372 // skip over files that are not regular files. | |
373 if ((statbuf.st_mode & S_IFMT) != S_IFREG) { | |
374 FREE_C_HEAP_ARRAY(char, filename); | |
375 continue; | |
376 } | |
377 | |
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378 // If we found a matching file with a newer creation time, then |
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379 // save the user name. The newer creation time indicates that |
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380 // we found a newer incarnation of the process associated with |
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381 // vmid. Due to the way that Windows recycles pids and the fact |
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382 // that we can't delete the file from the file system namespace |
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383 // until last close, it is possible for there to be more than |
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384 // one hsperfdata file with a name matching vmid (diff users). |
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385 // |
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386 // We no longer ignore hsperfdata files where (st_size == 0). |
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387 // In this function, all we're trying to do is determine the |
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388 // name of the user that owns the process associated with vmid |
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389 // so the size doesn't matter. Very rarely, we have observed |
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390 // hsperfdata files where (st_size == 0) and the st_size field |
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391 // later becomes the expected value. |
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392 // |
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393 if (statbuf.st_ctime > latest_ctime) { |
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394 char* user = strchr(dentry->d_name, '_') + 1; |
0 | 395 |
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396 if (latest_user != NULL) FREE_C_HEAP_ARRAY(char, latest_user); |
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397 latest_user = NEW_C_HEAP_ARRAY(char, strlen(user)+1); |
0 | 398 |
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399 strcpy(latest_user, user); |
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400 latest_ctime = statbuf.st_ctime; |
0 | 401 } |
402 | |
403 FREE_C_HEAP_ARRAY(char, filename); | |
404 } | |
405 } | |
406 os::closedir(subdirp); | |
407 FREE_C_HEAP_ARRAY(char, udbuf); | |
408 FREE_C_HEAP_ARRAY(char, usrdir_name); | |
409 } | |
410 os::closedir(tmpdirp); | |
411 FREE_C_HEAP_ARRAY(char, tdbuf); | |
412 | |
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413 return(latest_user); |
0 | 414 } |
415 | |
416 // return the name of the user that owns the process identified by vmid. | |
417 // | |
418 // note: this method should only be used via the Perf native methods. | |
419 // There are various costs to this method and limiting its use to the | |
420 // Perf native methods limits the impact to monitoring applications only. | |
421 // | |
422 static char* get_user_name(int vmid) { | |
423 | |
424 // A fast implementation is not provided at this time. It's possible | |
425 // to provide a fast process id to user name mapping function using | |
426 // the win32 apis, but the default ACL for the process object only | |
427 // allows processes with the same owner SID to acquire the process | |
428 // handle (via OpenProcess(PROCESS_QUERY_INFORMATION)). It's possible | |
429 // to have the JVM change the ACL for the process object to allow arbitrary | |
430 // users to access the process handle and the process security token. | |
431 // The security ramifications need to be studied before providing this | |
432 // mechanism. | |
433 // | |
434 return get_user_name_slow(vmid); | |
435 } | |
436 | |
437 // return the name of the shared memory file mapping object for the | |
438 // named shared memory region for the given user name and vmid. | |
439 // | |
440 // The file mapping object's name is not the file name. It is a name | |
441 // in a separate name space. | |
442 // | |
443 // the caller is expected to free the allocated memory. | |
444 // | |
445 static char *get_sharedmem_objectname(const char* user, int vmid) { | |
446 | |
447 // construct file mapping object's name, add 3 for two '_' and a | |
448 // null terminator. | |
449 int nbytes = (int)strlen(PERFDATA_NAME) + (int)strlen(user) + 3; | |
450 | |
451 // the id is converted to an unsigned value here because win32 allows | |
452 // negative process ids. However, OpenFileMapping API complains | |
453 // about a name containing a '-' characters. | |
454 // | |
455 nbytes += UINT_CHARS; | |
456 char* name = NEW_C_HEAP_ARRAY(char, nbytes); | |
457 _snprintf(name, nbytes, "%s_%s_%u", PERFDATA_NAME, user, vmid); | |
458 | |
459 return name; | |
460 } | |
461 | |
462 // return the file name of the backing store file for the named | |
463 // shared memory region for the given user name and vmid. | |
464 // | |
465 // the caller is expected to free the allocated memory. | |
466 // | |
467 static char* get_sharedmem_filename(const char* dirname, int vmid) { | |
468 | |
469 // add 2 for the file separator and a null terminator. | |
470 size_t nbytes = strlen(dirname) + UINT_CHARS + 2; | |
471 | |
472 char* name = NEW_C_HEAP_ARRAY(char, nbytes); | |
473 _snprintf(name, nbytes, "%s\\%d", dirname, vmid); | |
474 | |
475 return name; | |
476 } | |
477 | |
478 // remove file | |
479 // | |
480 // this method removes the file with the given file name. | |
481 // | |
482 // Note: if the indicated file is on an SMB network file system, this | |
483 // method may be unsuccessful in removing the file. | |
484 // | |
485 static void remove_file(const char* dirname, const char* filename) { | |
486 | |
487 size_t nbytes = strlen(dirname) + strlen(filename) + 2; | |
488 char* path = NEW_C_HEAP_ARRAY(char, nbytes); | |
489 | |
490 strcpy(path, dirname); | |
491 strcat(path, "\\"); | |
492 strcat(path, filename); | |
493 | |
494 if (::unlink(path) == OS_ERR) { | |
495 if (PrintMiscellaneous && Verbose) { | |
496 if (errno != ENOENT) { | |
497 warning("Could not unlink shared memory backing" | |
498 " store file %s : %s\n", path, strerror(errno)); | |
499 } | |
500 } | |
501 } | |
502 | |
503 FREE_C_HEAP_ARRAY(char, path); | |
504 } | |
505 | |
506 // returns true if the process represented by pid is alive, otherwise | |
507 // returns false. the validity of the result is only accurate if the | |
508 // target process is owned by the same principal that owns this process. | |
509 // this method should not be used if to test the status of an otherwise | |
510 // arbitrary process unless it is know that this process has the appropriate | |
511 // privileges to guarantee a result valid. | |
512 // | |
513 static bool is_alive(int pid) { | |
514 | |
515 HANDLE ph = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid); | |
516 if (ph == NULL) { | |
517 // the process does not exist. | |
518 if (PrintMiscellaneous && Verbose) { | |
519 DWORD lastError = GetLastError(); | |
520 if (lastError != ERROR_INVALID_PARAMETER) { | |
521 warning("OpenProcess failed: %d\n", GetLastError()); | |
522 } | |
523 } | |
524 return false; | |
525 } | |
526 | |
527 DWORD exit_status; | |
528 if (!GetExitCodeProcess(ph, &exit_status)) { | |
529 if (PrintMiscellaneous && Verbose) { | |
530 warning("GetExitCodeProcess failed: %d\n", GetLastError()); | |
531 } | |
532 CloseHandle(ph); | |
533 return false; | |
534 } | |
535 | |
536 CloseHandle(ph); | |
537 return (exit_status == STILL_ACTIVE) ? true : false; | |
538 } | |
539 | |
540 // check if the file system is considered secure for the backing store files | |
541 // | |
542 static bool is_filesystem_secure(const char* path) { | |
543 | |
544 char root_path[MAX_PATH]; | |
545 char fs_type[MAX_PATH]; | |
546 | |
547 if (PerfBypassFileSystemCheck) { | |
548 if (PrintMiscellaneous && Verbose) { | |
549 warning("bypassing file system criteria checks for %s\n", path); | |
550 } | |
551 return true; | |
552 } | |
553 | |
554 char* first_colon = strchr((char *)path, ':'); | |
555 if (first_colon == NULL) { | |
556 if (PrintMiscellaneous && Verbose) { | |
557 warning("expected device specifier in path: %s\n", path); | |
558 } | |
559 return false; | |
560 } | |
561 | |
562 size_t len = (size_t)(first_colon - path); | |
563 assert(len + 2 <= MAX_PATH, "unexpected device specifier length"); | |
564 strncpy(root_path, path, len + 1); | |
565 root_path[len + 1] = '\\'; | |
566 root_path[len + 2] = '\0'; | |
567 | |
568 // check that we have something like "C:\" or "AA:\" | |
569 assert(strlen(root_path) >= 3, "device specifier too short"); | |
570 assert(strchr(root_path, ':') != NULL, "bad device specifier format"); | |
571 assert(strchr(root_path, '\\') != NULL, "bad device specifier format"); | |
572 | |
573 DWORD maxpath; | |
574 DWORD flags; | |
575 | |
576 if (!GetVolumeInformation(root_path, NULL, 0, NULL, &maxpath, | |
577 &flags, fs_type, MAX_PATH)) { | |
578 // we can't get information about the volume, so assume unsafe. | |
579 if (PrintMiscellaneous && Verbose) { | |
580 warning("could not get device information for %s: " | |
581 " path = %s: lasterror = %d\n", | |
582 root_path, path, GetLastError()); | |
583 } | |
584 return false; | |
585 } | |
586 | |
587 if ((flags & FS_PERSISTENT_ACLS) == 0) { | |
588 // file system doesn't support ACLs, declare file system unsafe | |
589 if (PrintMiscellaneous && Verbose) { | |
590 warning("file system type %s on device %s does not support" | |
591 " ACLs\n", fs_type, root_path); | |
592 } | |
593 return false; | |
594 } | |
595 | |
596 if ((flags & FS_VOL_IS_COMPRESSED) != 0) { | |
597 // file system is compressed, declare file system unsafe | |
598 if (PrintMiscellaneous && Verbose) { | |
599 warning("file system type %s on device %s is compressed\n", | |
600 fs_type, root_path); | |
601 } | |
602 return false; | |
603 } | |
604 | |
605 return true; | |
606 } | |
607 | |
608 // cleanup stale shared memory resources | |
609 // | |
610 // This method attempts to remove all stale shared memory files in | |
611 // the named user temporary directory. It scans the named directory | |
612 // for files matching the pattern ^$[0-9]*$. For each file found, the | |
613 // process id is extracted from the file name and a test is run to | |
614 // determine if the process is alive. If the process is not alive, | |
615 // any stale file resources are removed. | |
616 // | |
617 static void cleanup_sharedmem_resources(const char* dirname) { | |
618 | |
619 // open the user temp directory | |
620 DIR* dirp = os::opendir(dirname); | |
621 | |
622 if (dirp == NULL) { | |
623 // directory doesn't exist, so there is nothing to cleanup | |
624 return; | |
625 } | |
626 | |
627 if (!is_directory_secure(dirname)) { | |
628 // the directory is not secure, don't attempt any cleanup | |
629 return; | |
630 } | |
631 | |
632 // for each entry in the directory that matches the expected file | |
633 // name pattern, determine if the file resources are stale and if | |
634 // so, remove the file resources. Note, instrumented HotSpot processes | |
635 // for this user may start and/or terminate during this search and | |
636 // remove or create new files in this directory. The behavior of this | |
637 // loop under these conditions is dependent upon the implementation of | |
638 // opendir/readdir. | |
639 // | |
640 struct dirent* entry; | |
641 char* dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(dirname)); | |
642 errno = 0; | |
643 while ((entry = os::readdir(dirp, (struct dirent *)dbuf)) != NULL) { | |
644 | |
645 int pid = filename_to_pid(entry->d_name); | |
646 | |
647 if (pid == 0) { | |
648 | |
649 if (strcmp(entry->d_name, ".") != 0 && strcmp(entry->d_name, "..") != 0) { | |
650 | |
651 // attempt to remove all unexpected files, except "." and ".." | |
652 remove_file(dirname, entry->d_name); | |
653 } | |
654 | |
655 errno = 0; | |
656 continue; | |
657 } | |
658 | |
659 // we now have a file name that converts to a valid integer | |
660 // that could represent a process id . if this process id | |
661 // matches the current process id or the process is not running, | |
662 // then remove the stale file resources. | |
663 // | |
664 // process liveness is detected by checking the exit status | |
665 // of the process. if the process id is valid and the exit status | |
666 // indicates that it is still running, the file file resources | |
667 // are not removed. If the process id is invalid, or if we don't | |
668 // have permissions to check the process status, or if the process | |
669 // id is valid and the process has terminated, the the file resources | |
670 // are assumed to be stale and are removed. | |
671 // | |
672 if (pid == os::current_process_id() || !is_alive(pid)) { | |
673 | |
674 // we can only remove the file resources. Any mapped views | |
675 // of the file can only be unmapped by the processes that | |
676 // opened those views and the file mapping object will not | |
677 // get removed until all views are unmapped. | |
678 // | |
679 remove_file(dirname, entry->d_name); | |
680 } | |
681 errno = 0; | |
682 } | |
683 os::closedir(dirp); | |
684 FREE_C_HEAP_ARRAY(char, dbuf); | |
685 } | |
686 | |
687 // create a file mapping object with the requested name, and size | |
688 // from the file represented by the given Handle object | |
689 // | |
690 static HANDLE create_file_mapping(const char* name, HANDLE fh, LPSECURITY_ATTRIBUTES fsa, size_t size) { | |
691 | |
692 DWORD lowSize = (DWORD)size; | |
693 DWORD highSize = 0; | |
694 HANDLE fmh = NULL; | |
695 | |
696 // Create a file mapping object with the given name. This function | |
697 // will grow the file to the specified size. | |
698 // | |
699 fmh = CreateFileMapping( | |
700 fh, /* HANDLE file handle for backing store */ | |
701 fsa, /* LPSECURITY_ATTRIBUTES Not inheritable */ | |
702 PAGE_READWRITE, /* DWORD protections */ | |
703 highSize, /* DWORD High word of max size */ | |
704 lowSize, /* DWORD Low word of max size */ | |
705 name); /* LPCTSTR name for object */ | |
706 | |
707 if (fmh == NULL) { | |
708 if (PrintMiscellaneous && Verbose) { | |
709 warning("CreateFileMapping failed, lasterror = %d\n", GetLastError()); | |
710 } | |
711 return NULL; | |
712 } | |
713 | |
714 if (GetLastError() == ERROR_ALREADY_EXISTS) { | |
715 | |
716 // a stale file mapping object was encountered. This object may be | |
717 // owned by this or some other user and cannot be removed until | |
718 // the other processes either exit or close their mapping objects | |
719 // and/or mapped views of this mapping object. | |
720 // | |
721 if (PrintMiscellaneous && Verbose) { | |
722 warning("file mapping already exists, lasterror = %d\n", GetLastError()); | |
723 } | |
724 | |
725 CloseHandle(fmh); | |
726 return NULL; | |
727 } | |
728 | |
729 return fmh; | |
730 } | |
731 | |
732 | |
733 // method to free the given security descriptor and the contained | |
734 // access control list. | |
735 // | |
736 static void free_security_desc(PSECURITY_DESCRIPTOR pSD) { | |
737 | |
738 BOOL success, exists, isdefault; | |
739 PACL pACL; | |
740 | |
741 if (pSD != NULL) { | |
742 | |
743 // get the access control list from the security descriptor | |
744 success = GetSecurityDescriptorDacl(pSD, &exists, &pACL, &isdefault); | |
745 | |
746 // if an ACL existed and it was not a default acl, then it must | |
747 // be an ACL we enlisted. free the resources. | |
748 // | |
749 if (success && exists && pACL != NULL && !isdefault) { | |
750 FREE_C_HEAP_ARRAY(char, pACL); | |
751 } | |
752 | |
753 // free the security descriptor | |
754 FREE_C_HEAP_ARRAY(char, pSD); | |
755 } | |
756 } | |
757 | |
758 // method to free up a security attributes structure and any | |
759 // contained security descriptors and ACL | |
760 // | |
761 static void free_security_attr(LPSECURITY_ATTRIBUTES lpSA) { | |
762 | |
763 if (lpSA != NULL) { | |
764 // free the contained security descriptor and the ACL | |
765 free_security_desc(lpSA->lpSecurityDescriptor); | |
766 lpSA->lpSecurityDescriptor = NULL; | |
767 | |
768 // free the security attributes structure | |
769 FREE_C_HEAP_ARRAY(char, lpSA); | |
770 } | |
771 } | |
772 | |
773 // get the user SID for the process indicated by the process handle | |
774 // | |
775 static PSID get_user_sid(HANDLE hProcess) { | |
776 | |
777 HANDLE hAccessToken; | |
778 PTOKEN_USER token_buf = NULL; | |
779 DWORD rsize = 0; | |
780 | |
781 if (hProcess == NULL) { | |
782 return NULL; | |
783 } | |
784 | |
785 // get the process token | |
786 if (!OpenProcessToken(hProcess, TOKEN_READ, &hAccessToken)) { | |
787 if (PrintMiscellaneous && Verbose) { | |
788 warning("OpenProcessToken failure: lasterror = %d \n", GetLastError()); | |
789 } | |
790 return NULL; | |
791 } | |
792 | |
793 // determine the size of the token structured needed to retrieve | |
794 // the user token information from the access token. | |
795 // | |
796 if (!GetTokenInformation(hAccessToken, TokenUser, NULL, rsize, &rsize)) { | |
797 DWORD lasterror = GetLastError(); | |
798 if (lasterror != ERROR_INSUFFICIENT_BUFFER) { | |
799 if (PrintMiscellaneous && Verbose) { | |
800 warning("GetTokenInformation failure: lasterror = %d," | |
801 " rsize = %d\n", lasterror, rsize); | |
802 } | |
803 CloseHandle(hAccessToken); | |
804 return NULL; | |
805 } | |
806 } | |
807 | |
808 token_buf = (PTOKEN_USER) NEW_C_HEAP_ARRAY(char, rsize); | |
809 | |
810 // get the user token information | |
811 if (!GetTokenInformation(hAccessToken, TokenUser, token_buf, rsize, &rsize)) { | |
812 if (PrintMiscellaneous && Verbose) { | |
813 warning("GetTokenInformation failure: lasterror = %d," | |
814 " rsize = %d\n", GetLastError(), rsize); | |
815 } | |
816 FREE_C_HEAP_ARRAY(char, token_buf); | |
817 CloseHandle(hAccessToken); | |
818 return NULL; | |
819 } | |
820 | |
821 DWORD nbytes = GetLengthSid(token_buf->User.Sid); | |
822 PSID pSID = NEW_C_HEAP_ARRAY(char, nbytes); | |
823 | |
824 if (!CopySid(nbytes, pSID, token_buf->User.Sid)) { | |
825 if (PrintMiscellaneous && Verbose) { | |
826 warning("GetTokenInformation failure: lasterror = %d," | |
827 " rsize = %d\n", GetLastError(), rsize); | |
828 } | |
829 FREE_C_HEAP_ARRAY(char, token_buf); | |
830 FREE_C_HEAP_ARRAY(char, pSID); | |
831 CloseHandle(hAccessToken); | |
832 return NULL; | |
833 } | |
834 | |
835 // close the access token. | |
836 CloseHandle(hAccessToken); | |
837 FREE_C_HEAP_ARRAY(char, token_buf); | |
838 | |
839 return pSID; | |
840 } | |
841 | |
842 // structure used to consolidate access control entry information | |
843 // | |
844 typedef struct ace_data { | |
845 PSID pSid; // SID of the ACE | |
846 DWORD mask; // mask for the ACE | |
847 } ace_data_t; | |
848 | |
849 | |
850 // method to add an allow access control entry with the access rights | |
851 // indicated in mask for the principal indicated in SID to the given | |
852 // security descriptor. Much of the DACL handling was adapted from | |
853 // the example provided here: | |
854 // http://support.microsoft.com/kb/102102/EN-US/ | |
855 // | |
856 | |
857 static bool add_allow_aces(PSECURITY_DESCRIPTOR pSD, | |
858 ace_data_t aces[], int ace_count) { | |
859 PACL newACL = NULL; | |
860 PACL oldACL = NULL; | |
861 | |
862 if (pSD == NULL) { | |
863 return false; | |
864 } | |
865 | |
866 BOOL exists, isdefault; | |
867 | |
868 // retrieve any existing access control list. | |
869 if (!GetSecurityDescriptorDacl(pSD, &exists, &oldACL, &isdefault)) { | |
870 if (PrintMiscellaneous && Verbose) { | |
871 warning("GetSecurityDescriptor failure: lasterror = %d \n", | |
872 GetLastError()); | |
873 } | |
874 return false; | |
875 } | |
876 | |
877 // get the size of the DACL | |
878 ACL_SIZE_INFORMATION aclinfo; | |
879 | |
880 // GetSecurityDescriptorDacl may return true value for exists (lpbDaclPresent) | |
881 // while oldACL is NULL for some case. | |
882 if (oldACL == NULL) { | |
883 exists = FALSE; | |
884 } | |
885 | |
886 if (exists) { | |
887 if (!GetAclInformation(oldACL, &aclinfo, | |
888 sizeof(ACL_SIZE_INFORMATION), | |
889 AclSizeInformation)) { | |
890 if (PrintMiscellaneous && Verbose) { | |
891 warning("GetAclInformation failure: lasterror = %d \n", GetLastError()); | |
892 return false; | |
893 } | |
894 } | |
895 } else { | |
896 aclinfo.AceCount = 0; // assume NULL DACL | |
897 aclinfo.AclBytesFree = 0; | |
898 aclinfo.AclBytesInUse = sizeof(ACL); | |
899 } | |
900 | |
901 // compute the size needed for the new ACL | |
902 // initial size of ACL is sum of the following: | |
903 // * size of ACL structure. | |
904 // * size of each ACE structure that ACL is to contain minus the sid | |
905 // sidStart member (DWORD) of the ACE. | |
906 // * length of the SID that each ACE is to contain. | |
907 DWORD newACLsize = aclinfo.AclBytesInUse + | |
908 (sizeof(ACCESS_ALLOWED_ACE) - sizeof(DWORD)) * ace_count; | |
909 for (int i = 0; i < ace_count; i++) { | |
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910 assert(aces[i].pSid != 0, "pSid should not be 0"); |
0 | 911 newACLsize += GetLengthSid(aces[i].pSid); |
912 } | |
913 | |
914 // create the new ACL | |
915 newACL = (PACL) NEW_C_HEAP_ARRAY(char, newACLsize); | |
916 | |
917 if (!InitializeAcl(newACL, newACLsize, ACL_REVISION)) { | |
918 if (PrintMiscellaneous && Verbose) { | |
919 warning("InitializeAcl failure: lasterror = %d \n", GetLastError()); | |
920 } | |
921 FREE_C_HEAP_ARRAY(char, newACL); | |
922 return false; | |
923 } | |
924 | |
925 unsigned int ace_index = 0; | |
926 // copy any existing ACEs from the old ACL (if any) to the new ACL. | |
927 if (aclinfo.AceCount != 0) { | |
928 while (ace_index < aclinfo.AceCount) { | |
929 LPVOID ace; | |
930 if (!GetAce(oldACL, ace_index, &ace)) { | |
931 if (PrintMiscellaneous && Verbose) { | |
932 warning("InitializeAcl failure: lasterror = %d \n", GetLastError()); | |
933 } | |
934 FREE_C_HEAP_ARRAY(char, newACL); | |
935 return false; | |
936 } | |
937 if (((ACCESS_ALLOWED_ACE *)ace)->Header.AceFlags && INHERITED_ACE) { | |
938 // this is an inherited, allowed ACE; break from loop so we can | |
939 // add the new access allowed, non-inherited ACE in the correct | |
940 // position, immediately following all non-inherited ACEs. | |
941 break; | |
942 } | |
943 | |
944 // determine if the SID of this ACE matches any of the SIDs | |
945 // for which we plan to set ACEs. | |
946 int matches = 0; | |
947 for (int i = 0; i < ace_count; i++) { | |
948 if (EqualSid(aces[i].pSid, &(((ACCESS_ALLOWED_ACE *)ace)->SidStart))) { | |
949 matches++; | |
950 break; | |
951 } | |
952 } | |
953 | |
954 // if there are no SID matches, then add this existing ACE to the new ACL | |
955 if (matches == 0) { | |
956 if (!AddAce(newACL, ACL_REVISION, MAXDWORD, ace, | |
957 ((PACE_HEADER)ace)->AceSize)) { | |
958 if (PrintMiscellaneous && Verbose) { | |
959 warning("AddAce failure: lasterror = %d \n", GetLastError()); | |
960 } | |
961 FREE_C_HEAP_ARRAY(char, newACL); | |
962 return false; | |
963 } | |
964 } | |
965 ace_index++; | |
966 } | |
967 } | |
968 | |
969 // add the passed-in access control entries to the new ACL | |
970 for (int i = 0; i < ace_count; i++) { | |
971 if (!AddAccessAllowedAce(newACL, ACL_REVISION, | |
972 aces[i].mask, aces[i].pSid)) { | |
973 if (PrintMiscellaneous && Verbose) { | |
974 warning("AddAccessAllowedAce failure: lasterror = %d \n", | |
975 GetLastError()); | |
976 } | |
977 FREE_C_HEAP_ARRAY(char, newACL); | |
978 return false; | |
979 } | |
980 } | |
981 | |
982 // now copy the rest of the inherited ACEs from the old ACL | |
983 if (aclinfo.AceCount != 0) { | |
984 // picking up at ace_index, where we left off in the | |
985 // previous ace_index loop | |
986 while (ace_index < aclinfo.AceCount) { | |
987 LPVOID ace; | |
988 if (!GetAce(oldACL, ace_index, &ace)) { | |
989 if (PrintMiscellaneous && Verbose) { | |
990 warning("InitializeAcl failure: lasterror = %d \n", GetLastError()); | |
991 } | |
992 FREE_C_HEAP_ARRAY(char, newACL); | |
993 return false; | |
994 } | |
995 if (!AddAce(newACL, ACL_REVISION, MAXDWORD, ace, | |
996 ((PACE_HEADER)ace)->AceSize)) { | |
997 if (PrintMiscellaneous && Verbose) { | |
998 warning("AddAce failure: lasterror = %d \n", GetLastError()); | |
999 } | |
1000 FREE_C_HEAP_ARRAY(char, newACL); | |
1001 return false; | |
1002 } | |
1003 ace_index++; | |
1004 } | |
1005 } | |
1006 | |
1007 // add the new ACL to the security descriptor. | |
1008 if (!SetSecurityDescriptorDacl(pSD, TRUE, newACL, FALSE)) { | |
1009 if (PrintMiscellaneous && Verbose) { | |
1010 warning("SetSecurityDescriptorDacl failure:" | |
1011 " lasterror = %d \n", GetLastError()); | |
1012 } | |
1013 FREE_C_HEAP_ARRAY(char, newACL); | |
1014 return false; | |
1015 } | |
1016 | |
605 | 1017 // if running on windows 2000 or later, set the automatic inheritance |
0 | 1018 // control flags. |
1019 SetSecurityDescriptorControlFnPtr _SetSecurityDescriptorControl; | |
1020 _SetSecurityDescriptorControl = (SetSecurityDescriptorControlFnPtr) | |
1021 GetProcAddress(GetModuleHandle(TEXT("advapi32.dll")), | |
1022 "SetSecurityDescriptorControl"); | |
1023 | |
1024 if (_SetSecurityDescriptorControl != NULL) { | |
605 | 1025 // We do not want to further propagate inherited DACLs, so making them |
0 | 1026 // protected prevents that. |
1027 if (!_SetSecurityDescriptorControl(pSD, SE_DACL_PROTECTED, | |
1028 SE_DACL_PROTECTED)) { | |
1029 if (PrintMiscellaneous && Verbose) { | |
1030 warning("SetSecurityDescriptorControl failure:" | |
1031 " lasterror = %d \n", GetLastError()); | |
1032 } | |
1033 FREE_C_HEAP_ARRAY(char, newACL); | |
1034 return false; | |
1035 } | |
1036 } | |
1037 // Note, the security descriptor maintains a reference to the newACL, not | |
1038 // a copy of it. Therefore, the newACL is not freed here. It is freed when | |
1039 // the security descriptor containing its reference is freed. | |
1040 // | |
1041 return true; | |
1042 } | |
1043 | |
1044 // method to create a security attributes structure, which contains a | |
1045 // security descriptor and an access control list comprised of 0 or more | |
1046 // access control entries. The method take an array of ace_data structures | |
1047 // that indicate the ACE to be added to the security descriptor. | |
1048 // | |
1049 // the caller must free the resources associated with the security | |
1050 // attributes structure created by this method by calling the | |
1051 // free_security_attr() method. | |
1052 // | |
1053 static LPSECURITY_ATTRIBUTES make_security_attr(ace_data_t aces[], int count) { | |
1054 | |
1055 // allocate space for a security descriptor | |
1056 PSECURITY_DESCRIPTOR pSD = (PSECURITY_DESCRIPTOR) | |
1057 NEW_C_HEAP_ARRAY(char, SECURITY_DESCRIPTOR_MIN_LENGTH); | |
1058 | |
1059 // initialize the security descriptor | |
1060 if (!InitializeSecurityDescriptor(pSD, SECURITY_DESCRIPTOR_REVISION)) { | |
1061 if (PrintMiscellaneous && Verbose) { | |
1062 warning("InitializeSecurityDescriptor failure: " | |
1063 "lasterror = %d \n", GetLastError()); | |
1064 } | |
1065 free_security_desc(pSD); | |
1066 return NULL; | |
1067 } | |
1068 | |
1069 // add the access control entries | |
1070 if (!add_allow_aces(pSD, aces, count)) { | |
1071 free_security_desc(pSD); | |
1072 return NULL; | |
1073 } | |
1074 | |
1075 // allocate and initialize the security attributes structure and | |
1076 // return it to the caller. | |
1077 // | |
1078 LPSECURITY_ATTRIBUTES lpSA = (LPSECURITY_ATTRIBUTES) | |
1079 NEW_C_HEAP_ARRAY(char, sizeof(SECURITY_ATTRIBUTES)); | |
1080 lpSA->nLength = sizeof(SECURITY_ATTRIBUTES); | |
1081 lpSA->lpSecurityDescriptor = pSD; | |
1082 lpSA->bInheritHandle = FALSE; | |
1083 | |
1084 return(lpSA); | |
1085 } | |
1086 | |
1087 // method to create a security attributes structure with a restrictive | |
1088 // access control list that creates a set access rights for the user/owner | |
1089 // of the securable object and a separate set access rights for everyone else. | |
1090 // also provides for full access rights for the administrator group. | |
1091 // | |
1092 // the caller must free the resources associated with the security | |
1093 // attributes structure created by this method by calling the | |
1094 // free_security_attr() method. | |
1095 // | |
1096 | |
1097 static LPSECURITY_ATTRIBUTES make_user_everybody_admin_security_attr( | |
1098 DWORD umask, DWORD emask, DWORD amask) { | |
1099 | |
1100 ace_data_t aces[3]; | |
1101 | |
1102 // initialize the user ace data | |
1103 aces[0].pSid = get_user_sid(GetCurrentProcess()); | |
1104 aces[0].mask = umask; | |
1105 | |
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1106 if (aces[0].pSid == 0) |
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1107 return NULL; |
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1108 |
0 | 1109 // get the well known SID for BUILTIN\Administrators |
1110 PSID administratorsSid = NULL; | |
1111 SID_IDENTIFIER_AUTHORITY SIDAuthAdministrators = SECURITY_NT_AUTHORITY; | |
1112 | |
1113 if (!AllocateAndInitializeSid( &SIDAuthAdministrators, 2, | |
1114 SECURITY_BUILTIN_DOMAIN_RID, | |
1115 DOMAIN_ALIAS_RID_ADMINS, | |
1116 0, 0, 0, 0, 0, 0, &administratorsSid)) { | |
1117 | |
1118 if (PrintMiscellaneous && Verbose) { | |
1119 warning("AllocateAndInitializeSid failure: " | |
1120 "lasterror = %d \n", GetLastError()); | |
1121 } | |
1122 return NULL; | |
1123 } | |
1124 | |
1125 // initialize the ace data for administrator group | |
1126 aces[1].pSid = administratorsSid; | |
1127 aces[1].mask = amask; | |
1128 | |
1129 // get the well known SID for the universal Everybody | |
1130 PSID everybodySid = NULL; | |
1131 SID_IDENTIFIER_AUTHORITY SIDAuthEverybody = SECURITY_WORLD_SID_AUTHORITY; | |
1132 | |
1133 if (!AllocateAndInitializeSid( &SIDAuthEverybody, 1, SECURITY_WORLD_RID, | |
1134 0, 0, 0, 0, 0, 0, 0, &everybodySid)) { | |
1135 | |
1136 if (PrintMiscellaneous && Verbose) { | |
1137 warning("AllocateAndInitializeSid failure: " | |
1138 "lasterror = %d \n", GetLastError()); | |
1139 } | |
1140 return NULL; | |
1141 } | |
1142 | |
1143 // initialize the ace data for everybody else. | |
1144 aces[2].pSid = everybodySid; | |
1145 aces[2].mask = emask; | |
1146 | |
1147 // create a security attributes structure with access control | |
1148 // entries as initialized above. | |
1149 LPSECURITY_ATTRIBUTES lpSA = make_security_attr(aces, 3); | |
1150 FREE_C_HEAP_ARRAY(char, aces[0].pSid); | |
1151 FreeSid(everybodySid); | |
1152 FreeSid(administratorsSid); | |
1153 return(lpSA); | |
1154 } | |
1155 | |
1156 | |
1157 // method to create the security attributes structure for restricting | |
1158 // access to the user temporary directory. | |
1159 // | |
1160 // the caller must free the resources associated with the security | |
1161 // attributes structure created by this method by calling the | |
1162 // free_security_attr() method. | |
1163 // | |
1164 static LPSECURITY_ATTRIBUTES make_tmpdir_security_attr() { | |
1165 | |
1166 // create full access rights for the user/owner of the directory | |
1167 // and read-only access rights for everybody else. This is | |
1168 // effectively equivalent to UNIX 755 permissions on a directory. | |
1169 // | |
1170 DWORD umask = STANDARD_RIGHTS_REQUIRED | FILE_ALL_ACCESS; | |
1171 DWORD emask = GENERIC_READ | FILE_LIST_DIRECTORY | FILE_TRAVERSE; | |
1172 DWORD amask = STANDARD_RIGHTS_ALL | FILE_ALL_ACCESS; | |
1173 | |
1174 return make_user_everybody_admin_security_attr(umask, emask, amask); | |
1175 } | |
1176 | |
1177 // method to create the security attributes structure for restricting | |
1178 // access to the shared memory backing store file. | |
1179 // | |
1180 // the caller must free the resources associated with the security | |
1181 // attributes structure created by this method by calling the | |
1182 // free_security_attr() method. | |
1183 // | |
1184 static LPSECURITY_ATTRIBUTES make_file_security_attr() { | |
1185 | |
1186 // create extensive access rights for the user/owner of the file | |
1187 // and attribute read-only access rights for everybody else. This | |
1188 // is effectively equivalent to UNIX 600 permissions on a file. | |
1189 // | |
1190 DWORD umask = STANDARD_RIGHTS_ALL | FILE_ALL_ACCESS; | |
1191 DWORD emask = STANDARD_RIGHTS_READ | FILE_READ_ATTRIBUTES | | |
1192 FILE_READ_EA | FILE_LIST_DIRECTORY | FILE_TRAVERSE; | |
1193 DWORD amask = STANDARD_RIGHTS_ALL | FILE_ALL_ACCESS; | |
1194 | |
1195 return make_user_everybody_admin_security_attr(umask, emask, amask); | |
1196 } | |
1197 | |
1198 // method to create the security attributes structure for restricting | |
1199 // access to the name shared memory file mapping object. | |
1200 // | |
1201 // the caller must free the resources associated with the security | |
1202 // attributes structure created by this method by calling the | |
1203 // free_security_attr() method. | |
1204 // | |
1205 static LPSECURITY_ATTRIBUTES make_smo_security_attr() { | |
1206 | |
1207 // create extensive access rights for the user/owner of the shared | |
1208 // memory object and attribute read-only access rights for everybody | |
1209 // else. This is effectively equivalent to UNIX 600 permissions on | |
1210 // on the shared memory object. | |
1211 // | |
1212 DWORD umask = STANDARD_RIGHTS_REQUIRED | FILE_MAP_ALL_ACCESS; | |
1213 DWORD emask = STANDARD_RIGHTS_READ; // attributes only | |
1214 DWORD amask = STANDARD_RIGHTS_ALL | FILE_MAP_ALL_ACCESS; | |
1215 | |
1216 return make_user_everybody_admin_security_attr(umask, emask, amask); | |
1217 } | |
1218 | |
1219 // make the user specific temporary directory | |
1220 // | |
1221 static bool make_user_tmp_dir(const char* dirname) { | |
1222 | |
1223 | |
1224 LPSECURITY_ATTRIBUTES pDirSA = make_tmpdir_security_attr(); | |
1225 if (pDirSA == NULL) { | |
1226 return false; | |
1227 } | |
1228 | |
1229 | |
1230 // create the directory with the given security attributes | |
1231 if (!CreateDirectory(dirname, pDirSA)) { | |
1232 DWORD lasterror = GetLastError(); | |
1233 if (lasterror == ERROR_ALREADY_EXISTS) { | |
1234 // The directory already exists and was probably created by another | |
1235 // JVM instance. However, this could also be the result of a | |
1236 // deliberate symlink. Verify that the existing directory is safe. | |
1237 // | |
1238 if (!is_directory_secure(dirname)) { | |
1239 // directory is not secure | |
1240 if (PrintMiscellaneous && Verbose) { | |
1241 warning("%s directory is insecure\n", dirname); | |
1242 } | |
1243 return false; | |
1244 } | |
1245 // The administrator should be able to delete this directory. | |
1246 // But the directory created by previous version of JVM may not | |
1247 // have permission for administrators to delete this directory. | |
1248 // So add full permission to the administrator. Also setting new | |
1249 // DACLs might fix the corrupted the DACLs. | |
1250 SECURITY_INFORMATION secInfo = DACL_SECURITY_INFORMATION; | |
1251 if (!SetFileSecurity(dirname, secInfo, pDirSA->lpSecurityDescriptor)) { | |
1252 if (PrintMiscellaneous && Verbose) { | |
1253 lasterror = GetLastError(); | |
1254 warning("SetFileSecurity failed for %s directory. lasterror %d \n", | |
1255 dirname, lasterror); | |
1256 } | |
1257 } | |
1258 } | |
1259 else { | |
1260 if (PrintMiscellaneous && Verbose) { | |
1261 warning("CreateDirectory failed: %d\n", GetLastError()); | |
1262 } | |
1263 return false; | |
1264 } | |
1265 } | |
1266 | |
1267 // free the security attributes structure | |
1268 free_security_attr(pDirSA); | |
1269 | |
1270 return true; | |
1271 } | |
1272 | |
1273 // create the shared memory resources | |
1274 // | |
1275 // This function creates the shared memory resources. This includes | |
1276 // the backing store file and the file mapping shared memory object. | |
1277 // | |
1278 static HANDLE create_sharedmem_resources(const char* dirname, const char* filename, const char* objectname, size_t size) { | |
1279 | |
1280 HANDLE fh = INVALID_HANDLE_VALUE; | |
1281 HANDLE fmh = NULL; | |
1282 | |
1283 | |
1284 // create the security attributes for the backing store file | |
1285 LPSECURITY_ATTRIBUTES lpFileSA = make_file_security_attr(); | |
1286 if (lpFileSA == NULL) { | |
1287 return NULL; | |
1288 } | |
1289 | |
1290 // create the security attributes for the shared memory object | |
1291 LPSECURITY_ATTRIBUTES lpSmoSA = make_smo_security_attr(); | |
1292 if (lpSmoSA == NULL) { | |
1293 free_security_attr(lpFileSA); | |
1294 return NULL; | |
1295 } | |
1296 | |
1297 // create the user temporary directory | |
1298 if (!make_user_tmp_dir(dirname)) { | |
1299 // could not make/find the directory or the found directory | |
1300 // was not secure | |
1301 return NULL; | |
1302 } | |
1303 | |
1304 // Create the file - the FILE_FLAG_DELETE_ON_CLOSE flag allows the | |
1305 // file to be deleted by the last process that closes its handle to | |
1306 // the file. This is important as the apis do not allow a terminating | |
1307 // JVM being monitored by another process to remove the file name. | |
1308 // | |
1309 // the FILE_SHARE_DELETE share mode is valid only in winnt | |
1310 // | |
1311 fh = CreateFile( | |
1312 filename, /* LPCTSTR file name */ | |
1313 | |
1314 GENERIC_READ|GENERIC_WRITE, /* DWORD desired access */ | |
1315 | |
1316 (os::win32::is_nt() ? FILE_SHARE_DELETE : 0)| | |
1317 FILE_SHARE_READ, /* DWORD share mode, future READONLY | |
1318 * open operations allowed | |
1319 */ | |
1320 lpFileSA, /* LPSECURITY security attributes */ | |
1321 CREATE_ALWAYS, /* DWORD creation disposition | |
1322 * create file, if it already | |
1323 * exists, overwrite it. | |
1324 */ | |
1325 FILE_FLAG_DELETE_ON_CLOSE, /* DWORD flags and attributes */ | |
1326 | |
1327 NULL); /* HANDLE template file access */ | |
1328 | |
1329 free_security_attr(lpFileSA); | |
1330 | |
1331 if (fh == INVALID_HANDLE_VALUE) { | |
1332 DWORD lasterror = GetLastError(); | |
1333 if (PrintMiscellaneous && Verbose) { | |
1334 warning("could not create file %s: %d\n", filename, lasterror); | |
1335 } | |
1336 return NULL; | |
1337 } | |
1338 | |
1339 // try to create the file mapping | |
1340 fmh = create_file_mapping(objectname, fh, lpSmoSA, size); | |
1341 | |
1342 free_security_attr(lpSmoSA); | |
1343 | |
1344 if (fmh == NULL) { | |
1345 // closing the file handle here will decrement the reference count | |
1346 // on the file. When all processes accessing the file close their | |
1347 // handle to it, the reference count will decrement to 0 and the | |
1348 // OS will delete the file. These semantics are requested by the | |
1349 // FILE_FLAG_DELETE_ON_CLOSE flag in CreateFile call above. | |
1350 CloseHandle(fh); | |
1351 fh = NULL; | |
1352 return NULL; | |
2236
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1353 } else { |
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1354 // We created the file mapping, but rarely the size of the |
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1355 // backing store file is reported as zero (0) which can cause |
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1356 // failures when trying to use the hsperfdata file. |
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1357 struct stat statbuf; |
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1358 int ret_code = ::stat(filename, &statbuf); |
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1359 if (ret_code == OS_ERR) { |
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1360 if (PrintMiscellaneous && Verbose) { |
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1361 warning("Could not get status information from file %s: %s\n", |
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1362 filename, strerror(errno)); |
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1363 } |
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1364 CloseHandle(fmh); |
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1365 CloseHandle(fh); |
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1366 fh = NULL; |
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1367 fmh = NULL; |
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1368 return NULL; |
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1369 } |
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1370 |
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1371 // We could always call FlushFileBuffers() but the Microsoft |
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1372 // docs indicate that it is considered expensive so we only |
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1373 // call it when we observe the size as zero (0). |
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1374 if (statbuf.st_size == 0 && FlushFileBuffers(fh) != TRUE) { |
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1375 DWORD lasterror = GetLastError(); |
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1376 if (PrintMiscellaneous && Verbose) { |
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1377 warning("could not flush file %s: %d\n", filename, lasterror); |
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1378 } |
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1379 CloseHandle(fmh); |
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1380 CloseHandle(fh); |
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1381 fh = NULL; |
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1382 fmh = NULL; |
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1383 return NULL; |
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1384 } |
0 | 1385 } |
1386 | |
1387 // the file has been successfully created and the file mapping | |
1388 // object has been created. | |
1389 sharedmem_fileHandle = fh; | |
1390 sharedmem_fileName = strdup(filename); | |
1391 | |
1392 return fmh; | |
1393 } | |
1394 | |
1395 // open the shared memory object for the given vmid. | |
1396 // | |
1397 static HANDLE open_sharedmem_object(const char* objectname, DWORD ofm_access, TRAPS) { | |
1398 | |
1399 HANDLE fmh; | |
1400 | |
1401 // open the file mapping with the requested mode | |
1402 fmh = OpenFileMapping( | |
1403 ofm_access, /* DWORD access mode */ | |
1404 FALSE, /* BOOL inherit flag - Do not allow inherit */ | |
1405 objectname); /* name for object */ | |
1406 | |
1407 if (fmh == NULL) { | |
1408 if (PrintMiscellaneous && Verbose) { | |
1409 warning("OpenFileMapping failed for shared memory object %s:" | |
1410 " lasterror = %d\n", objectname, GetLastError()); | |
1411 } | |
1412 THROW_MSG_(vmSymbols::java_lang_Exception(), | |
1413 "Could not open PerfMemory", INVALID_HANDLE_VALUE); | |
1414 } | |
1415 | |
1416 return fmh;; | |
1417 } | |
1418 | |
1419 // create a named shared memory region | |
1420 // | |
1421 // On Win32, a named shared memory object has a name space that | |
1422 // is independent of the file system name space. Shared memory object, | |
1423 // or more precisely, file mapping objects, provide no mechanism to | |
1424 // inquire the size of the memory region. There is also no api to | |
1425 // enumerate the memory regions for various processes. | |
1426 // | |
1427 // This implementation utilizes the shared memory name space in parallel | |
1428 // with the file system name space. This allows us to determine the | |
1429 // size of the shared memory region from the size of the file and it | |
1430 // allows us to provide a common, file system based name space for | |
1431 // shared memory across platforms. | |
1432 // | |
1433 static char* mapping_create_shared(size_t size) { | |
1434 | |
1435 void *mapAddress; | |
1436 int vmid = os::current_process_id(); | |
1437 | |
1438 // get the name of the user associated with this process | |
1439 char* user = get_user_name(); | |
1440 | |
1441 if (user == NULL) { | |
1442 return NULL; | |
1443 } | |
1444 | |
1445 // construct the name of the user specific temporary directory | |
1446 char* dirname = get_user_tmp_dir(user); | |
1447 | |
1448 // check that the file system is secure - i.e. it supports ACLs. | |
1449 if (!is_filesystem_secure(dirname)) { | |
1450 return NULL; | |
1451 } | |
1452 | |
1453 // create the names of the backing store files and for the | |
1454 // share memory object. | |
1455 // | |
1456 char* filename = get_sharedmem_filename(dirname, vmid); | |
1457 char* objectname = get_sharedmem_objectname(user, vmid); | |
1458 | |
1459 // cleanup any stale shared memory resources | |
1460 cleanup_sharedmem_resources(dirname); | |
1461 | |
1462 assert(((size != 0) && (size % os::vm_page_size() == 0)), | |
1463 "unexpected PerfMemry region size"); | |
1464 | |
1465 FREE_C_HEAP_ARRAY(char, user); | |
1466 | |
1467 // create the shared memory resources | |
1468 sharedmem_fileMapHandle = | |
1469 create_sharedmem_resources(dirname, filename, objectname, size); | |
1470 | |
1471 FREE_C_HEAP_ARRAY(char, filename); | |
1472 FREE_C_HEAP_ARRAY(char, objectname); | |
1473 FREE_C_HEAP_ARRAY(char, dirname); | |
1474 | |
1475 if (sharedmem_fileMapHandle == NULL) { | |
1476 return NULL; | |
1477 } | |
1478 | |
1479 // map the file into the address space | |
1480 mapAddress = MapViewOfFile( | |
1481 sharedmem_fileMapHandle, /* HANDLE = file mapping object */ | |
1482 FILE_MAP_ALL_ACCESS, /* DWORD access flags */ | |
1483 0, /* DWORD High word of offset */ | |
1484 0, /* DWORD Low word of offset */ | |
1485 (DWORD)size); /* DWORD Number of bytes to map */ | |
1486 | |
1487 if (mapAddress == NULL) { | |
1488 if (PrintMiscellaneous && Verbose) { | |
1489 warning("MapViewOfFile failed, lasterror = %d\n", GetLastError()); | |
1490 } | |
1491 CloseHandle(sharedmem_fileMapHandle); | |
1492 sharedmem_fileMapHandle = NULL; | |
1493 return NULL; | |
1494 } | |
1495 | |
1496 // clear the shared memory region | |
1497 (void)memset(mapAddress, '\0', size); | |
1498 | |
1499 return (char*) mapAddress; | |
1500 } | |
1501 | |
1502 // this method deletes the file mapping object. | |
1503 // | |
1504 static void delete_file_mapping(char* addr, size_t size) { | |
1505 | |
1506 // cleanup the persistent shared memory resources. since DestroyJavaVM does | |
1507 // not support unloading of the JVM, unmapping of the memory resource is not | |
1508 // performed. The memory will be reclaimed by the OS upon termination of all | |
1509 // processes mapping the resource. The file mapping handle and the file | |
1510 // handle are closed here to expedite the remove of the file by the OS. The | |
1511 // file is not removed directly because it was created with | |
1512 // FILE_FLAG_DELETE_ON_CLOSE semantics and any attempt to remove it would | |
1513 // be unsuccessful. | |
1514 | |
1515 // close the fileMapHandle. the file mapping will still be retained | |
1516 // by the OS as long as any other JVM processes has an open file mapping | |
1517 // handle or a mapped view of the file. | |
1518 // | |
1519 if (sharedmem_fileMapHandle != NULL) { | |
1520 CloseHandle(sharedmem_fileMapHandle); | |
1521 sharedmem_fileMapHandle = NULL; | |
1522 } | |
1523 | |
1524 // close the file handle. This will decrement the reference count on the | |
1525 // backing store file. When the reference count decrements to 0, the OS | |
1526 // will delete the file. These semantics apply because the file was | |
1527 // created with the FILE_FLAG_DELETE_ON_CLOSE flag. | |
1528 // | |
1529 if (sharedmem_fileHandle != INVALID_HANDLE_VALUE) { | |
1530 CloseHandle(sharedmem_fileHandle); | |
1531 sharedmem_fileHandle = INVALID_HANDLE_VALUE; | |
1532 } | |
1533 } | |
1534 | |
1535 // this method determines the size of the shared memory file | |
1536 // | |
1537 static size_t sharedmem_filesize(const char* filename, TRAPS) { | |
1538 | |
1539 struct stat statbuf; | |
1540 | |
1541 // get the file size | |
1542 // | |
1543 // on win95/98/me, _stat returns a file size of 0 bytes, but on | |
1544 // winnt/2k the appropriate file size is returned. support for | |
1545 // the sharable aspects of performance counters was abandonded | |
1546 // on the non-nt win32 platforms due to this and other api | |
1547 // inconsistencies | |
1548 // | |
1549 if (::stat(filename, &statbuf) == OS_ERR) { | |
1550 if (PrintMiscellaneous && Verbose) { | |
1551 warning("stat %s failed: %s\n", filename, strerror(errno)); | |
1552 } | |
1553 THROW_MSG_0(vmSymbols::java_io_IOException(), | |
1554 "Could not determine PerfMemory size"); | |
1555 } | |
1556 | |
1557 if ((statbuf.st_size == 0) || (statbuf.st_size % os::vm_page_size() != 0)) { | |
1558 if (PrintMiscellaneous && Verbose) { | |
1559 warning("unexpected file size: size = " SIZE_FORMAT "\n", | |
1560 statbuf.st_size); | |
1561 } | |
1562 THROW_MSG_0(vmSymbols::java_lang_Exception(), | |
1563 "Invalid PerfMemory size"); | |
1564 } | |
1565 | |
1566 return statbuf.st_size; | |
1567 } | |
1568 | |
1569 // this method opens a file mapping object and maps the object | |
1570 // into the address space of the process | |
1571 // | |
1572 static void open_file_mapping(const char* user, int vmid, | |
1573 PerfMemory::PerfMemoryMode mode, | |
1574 char** addrp, size_t* sizep, TRAPS) { | |
1575 | |
1576 ResourceMark rm; | |
1577 | |
1578 void *mapAddress = 0; | |
1579 size_t size; | |
1580 HANDLE fmh; | |
1581 DWORD ofm_access; | |
1582 DWORD mv_access; | |
1583 const char* luser = NULL; | |
1584 | |
1585 if (mode == PerfMemory::PERF_MODE_RO) { | |
1586 ofm_access = FILE_MAP_READ; | |
1587 mv_access = FILE_MAP_READ; | |
1588 } | |
1589 else if (mode == PerfMemory::PERF_MODE_RW) { | |
1590 #ifdef LATER | |
1591 ofm_access = FILE_MAP_READ | FILE_MAP_WRITE; | |
1592 mv_access = FILE_MAP_READ | FILE_MAP_WRITE; | |
1593 #else | |
1594 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), | |
1595 "Unsupported access mode"); | |
1596 #endif | |
1597 } | |
1598 else { | |
1599 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), | |
1600 "Illegal access mode"); | |
1601 } | |
1602 | |
1603 // if a user name wasn't specified, then find the user name for | |
1604 // the owner of the target vm. | |
1605 if (user == NULL || strlen(user) == 0) { | |
1606 luser = get_user_name(vmid); | |
1607 } | |
1608 else { | |
1609 luser = user; | |
1610 } | |
1611 | |
1612 if (luser == NULL) { | |
1613 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), | |
1614 "Could not map vmid to user name"); | |
1615 } | |
1616 | |
1617 // get the names for the resources for the target vm | |
1618 char* dirname = get_user_tmp_dir(luser); | |
1619 | |
1620 // since we don't follow symbolic links when creating the backing | |
1621 // store file, we also don't following them when attaching | |
1622 // | |
1623 if (!is_directory_secure(dirname)) { | |
1624 FREE_C_HEAP_ARRAY(char, dirname); | |
1625 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), | |
1626 "Process not found"); | |
1627 } | |
1628 | |
1629 char* filename = get_sharedmem_filename(dirname, vmid); | |
1630 char* objectname = get_sharedmem_objectname(luser, vmid); | |
1631 | |
1632 // copy heap memory to resource memory. the objectname and | |
1633 // filename are passed to methods that may throw exceptions. | |
1634 // using resource arrays for these names prevents the leaks | |
1635 // that would otherwise occur. | |
1636 // | |
1637 char* rfilename = NEW_RESOURCE_ARRAY(char, strlen(filename) + 1); | |
1638 char* robjectname = NEW_RESOURCE_ARRAY(char, strlen(objectname) + 1); | |
1639 strcpy(rfilename, filename); | |
1640 strcpy(robjectname, objectname); | |
1641 | |
1642 // free the c heap resources that are no longer needed | |
1643 if (luser != user) FREE_C_HEAP_ARRAY(char, luser); | |
1644 FREE_C_HEAP_ARRAY(char, dirname); | |
1645 FREE_C_HEAP_ARRAY(char, filename); | |
1646 FREE_C_HEAP_ARRAY(char, objectname); | |
1647 | |
1648 if (*sizep == 0) { | |
1649 size = sharedmem_filesize(rfilename, CHECK); | |
1650 assert(size != 0, "unexpected size"); | |
1651 } | |
1652 | |
1653 // Open the file mapping object with the given name | |
1654 fmh = open_sharedmem_object(robjectname, ofm_access, CHECK); | |
1655 | |
1656 assert(fmh != INVALID_HANDLE_VALUE, "unexpected handle value"); | |
1657 | |
1658 // map the entire file into the address space | |
1659 mapAddress = MapViewOfFile( | |
1660 fmh, /* HANDLE Handle of file mapping object */ | |
1661 mv_access, /* DWORD access flags */ | |
1662 0, /* DWORD High word of offset */ | |
1663 0, /* DWORD Low word of offset */ | |
1664 size); /* DWORD Number of bytes to map */ | |
1665 | |
1666 if (mapAddress == NULL) { | |
1667 if (PrintMiscellaneous && Verbose) { | |
1668 warning("MapViewOfFile failed, lasterror = %d\n", GetLastError()); | |
1669 } | |
1670 CloseHandle(fmh); | |
1671 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), | |
1672 "Could not map PerfMemory"); | |
1673 } | |
1674 | |
1675 *addrp = (char*)mapAddress; | |
1676 *sizep = size; | |
1677 | |
1678 // File mapping object can be closed at this time without | |
1679 // invalidating the mapped view of the file | |
1680 CloseHandle(fmh); | |
1681 | |
1682 if (PerfTraceMemOps) { | |
1683 tty->print("mapped " SIZE_FORMAT " bytes for vmid %d at " | |
1684 INTPTR_FORMAT "\n", size, vmid, mapAddress); | |
1685 } | |
1686 } | |
1687 | |
1688 // this method unmaps the the mapped view of the the | |
1689 // file mapping object. | |
1690 // | |
1691 static void remove_file_mapping(char* addr) { | |
1692 | |
1693 // the file mapping object was closed in open_file_mapping() | |
1694 // after the file map view was created. We only need to | |
1695 // unmap the file view here. | |
1696 UnmapViewOfFile(addr); | |
1697 } | |
1698 | |
1699 // create the PerfData memory region in shared memory. | |
1700 static char* create_shared_memory(size_t size) { | |
1701 | |
1702 return mapping_create_shared(size); | |
1703 } | |
1704 | |
1705 // release a named, shared memory region | |
1706 // | |
1707 void delete_shared_memory(char* addr, size_t size) { | |
1708 | |
1709 delete_file_mapping(addr, size); | |
1710 } | |
1711 | |
1712 | |
1713 | |
1714 | |
1715 // create the PerfData memory region | |
1716 // | |
1717 // This method creates the memory region used to store performance | |
1718 // data for the JVM. The memory may be created in standard or | |
1719 // shared memory. | |
1720 // | |
1721 void PerfMemory::create_memory_region(size_t size) { | |
1722 | |
1723 if (PerfDisableSharedMem || !os::win32::is_nt()) { | |
1724 // do not share the memory for the performance data. | |
1725 PerfDisableSharedMem = true; | |
1726 _start = create_standard_memory(size); | |
1727 } | |
1728 else { | |
1729 _start = create_shared_memory(size); | |
1730 if (_start == NULL) { | |
1731 | |
1732 // creation of the shared memory region failed, attempt | |
1733 // to create a contiguous, non-shared memory region instead. | |
1734 // | |
1735 if (PrintMiscellaneous && Verbose) { | |
1736 warning("Reverting to non-shared PerfMemory region.\n"); | |
1737 } | |
1738 PerfDisableSharedMem = true; | |
1739 _start = create_standard_memory(size); | |
1740 } | |
1741 } | |
1742 | |
1743 if (_start != NULL) _capacity = size; | |
1744 | |
1745 } | |
1746 | |
1747 // delete the PerfData memory region | |
1748 // | |
1749 // This method deletes the memory region used to store performance | |
1750 // data for the JVM. The memory region indicated by the <address, size> | |
1751 // tuple will be inaccessible after a call to this method. | |
1752 // | |
1753 void PerfMemory::delete_memory_region() { | |
1754 | |
1755 assert((start() != NULL && capacity() > 0), "verify proper state"); | |
1756 | |
1757 // If user specifies PerfDataSaveFile, it will save the performance data | |
1758 // to the specified file name no matter whether PerfDataSaveToFile is specified | |
1759 // or not. In other word, -XX:PerfDataSaveFile=.. overrides flag | |
1760 // -XX:+PerfDataSaveToFile. | |
1761 if (PerfDataSaveToFile || PerfDataSaveFile != NULL) { | |
1762 save_memory_to_file(start(), capacity()); | |
1763 } | |
1764 | |
1765 if (PerfDisableSharedMem) { | |
1766 delete_standard_memory(start(), capacity()); | |
1767 } | |
1768 else { | |
1769 delete_shared_memory(start(), capacity()); | |
1770 } | |
1771 } | |
1772 | |
1773 // attach to the PerfData memory region for another JVM | |
1774 // | |
1775 // This method returns an <address, size> tuple that points to | |
1776 // a memory buffer that is kept reasonably synchronized with | |
1777 // the PerfData memory region for the indicated JVM. This | |
1778 // buffer may be kept in synchronization via shared memory | |
1779 // or some other mechanism that keeps the buffer updated. | |
1780 // | |
1781 // If the JVM chooses not to support the attachability feature, | |
1782 // this method should throw an UnsupportedOperation exception. | |
1783 // | |
1784 // This implementation utilizes named shared memory to map | |
1785 // the indicated process's PerfData memory region into this JVMs | |
1786 // address space. | |
1787 // | |
1788 void PerfMemory::attach(const char* user, int vmid, PerfMemoryMode mode, | |
1789 char** addrp, size_t* sizep, TRAPS) { | |
1790 | |
1791 if (vmid == 0 || vmid == os::current_process_id()) { | |
1792 *addrp = start(); | |
1793 *sizep = capacity(); | |
1794 return; | |
1795 } | |
1796 | |
1797 open_file_mapping(user, vmid, mode, addrp, sizep, CHECK); | |
1798 } | |
1799 | |
1800 // detach from the PerfData memory region of another JVM | |
1801 // | |
1802 // This method detaches the PerfData memory region of another | |
1803 // JVM, specified as an <address, size> tuple of a buffer | |
1804 // in this process's address space. This method may perform | |
1805 // arbitrary actions to accomplish the detachment. The memory | |
1806 // region specified by <address, size> will be inaccessible after | |
1807 // a call to this method. | |
1808 // | |
1809 // If the JVM chooses not to support the attachability feature, | |
1810 // this method should throw an UnsupportedOperation exception. | |
1811 // | |
1812 // This implementation utilizes named shared memory to detach | |
1813 // the indicated process's PerfData memory region from this | |
1814 // process's address space. | |
1815 // | |
1816 void PerfMemory::detach(char* addr, size_t bytes, TRAPS) { | |
1817 | |
1818 assert(addr != 0, "address sanity check"); | |
1819 assert(bytes > 0, "capacity sanity check"); | |
1820 | |
1821 if (PerfMemory::contains(addr) || PerfMemory::contains(addr + bytes - 1)) { | |
1822 // prevent accidental detachment of this process's PerfMemory region | |
1823 return; | |
1824 } | |
1825 | |
1826 remove_file_mapping(addr); | |
1827 } | |
1828 | |
1829 char* PerfMemory::backing_store_filename() { | |
1830 return sharedmem_fileName; | |
1831 } |