Mercurial > hg > truffle
annotate src/os/linux/vm/perfMemory_linux.cpp @ 21816:60a992c821f8
8050807: Better performing performance data handling
Reviewed-by: dcubed, dholmes, pnauman, ctornqvi, mschoene
Contributed-by: gerald.thornbrugh@oracle.com
| author | hseigel |
|---|---|
| date | Fri, 24 Oct 2014 15:02:37 -0400 |
| parents | 78bbf4d43a14 |
| children | 5ca2ea5eeff0 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 17765 | 2 * Copyright (c) 2001, 2014, 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 * | |
|
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1353
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1353
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1353
diff
changeset
|
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_linux.inline.hpp" | |
| 31 #include "runtime/handles.inline.hpp" | |
| 32 #include "runtime/perfMemory.hpp" | |
|
6882
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
zgu
parents:
6842
diff
changeset
|
33 #include "services/memTracker.hpp" |
| 1972 | 34 #include "utilities/exceptions.hpp" |
| 0 | 35 |
| 36 // put OS-includes here | |
| 37 # include <sys/types.h> | |
| 38 # include <sys/mman.h> | |
| 39 # include <errno.h> | |
| 40 # include <stdio.h> | |
| 41 # include <unistd.h> | |
| 42 # include <sys/stat.h> | |
| 43 # include <signal.h> | |
| 44 # include <pwd.h> | |
| 45 | |
| 46 static char* backing_store_file_name = NULL; // name of the backing store | |
| 47 // file, if successfully created. | |
| 48 | |
| 49 // Standard Memory Implementation Details | |
| 50 | |
| 51 // create the PerfData memory region in standard memory. | |
| 52 // | |
| 53 static char* create_standard_memory(size_t size) { | |
| 54 | |
| 55 // allocate an aligned chuck of memory | |
| 56 char* mapAddress = os::reserve_memory(size); | |
| 57 | |
| 58 if (mapAddress == NULL) { | |
| 59 return NULL; | |
| 60 } | |
| 61 | |
| 62 // commit memory | |
|
10969
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
9064
diff
changeset
|
63 if (!os::commit_memory(mapAddress, size, !ExecMem)) { |
| 0 | 64 if (PrintMiscellaneous && Verbose) { |
| 65 warning("Could not commit PerfData memory\n"); | |
| 66 } | |
| 67 os::release_memory(mapAddress, size); | |
| 68 return NULL; | |
| 69 } | |
| 70 | |
| 71 return mapAddress; | |
| 72 } | |
| 73 | |
| 74 // delete the PerfData memory region | |
| 75 // | |
| 76 static void delete_standard_memory(char* addr, size_t size) { | |
| 77 | |
| 78 // there are no persistent external resources to cleanup for standard | |
| 79 // memory. since DestroyJavaVM does not support unloading of the JVM, | |
| 80 // cleanup of the memory resource is not performed. The memory will be | |
| 81 // reclaimed by the OS upon termination of the process. | |
| 82 // | |
| 83 return; | |
| 84 } | |
| 85 | |
| 86 // save the specified memory region to the given file | |
| 87 // | |
| 88 // Note: this function might be called from signal handler (by os::abort()), | |
| 89 // don't allocate heap memory. | |
| 90 // | |
| 91 static void save_memory_to_file(char* addr, size_t size) { | |
| 92 | |
| 93 const char* destfile = PerfMemory::get_perfdata_file_path(); | |
| 94 assert(destfile[0] != '\0', "invalid PerfData file path"); | |
| 95 | |
| 96 int result; | |
| 97 | |
| 98 RESTARTABLE(::open(destfile, O_CREAT|O_WRONLY|O_TRUNC, S_IREAD|S_IWRITE), | |
| 99 result);; | |
| 100 if (result == OS_ERR) { | |
| 101 if (PrintMiscellaneous && Verbose) { | |
| 102 warning("Could not create Perfdata save file: %s: %s\n", | |
| 103 destfile, strerror(errno)); | |
| 104 } | |
| 105 } else { | |
| 106 int fd = result; | |
| 107 | |
| 108 for (size_t remaining = size; remaining > 0;) { | |
| 109 | |
| 110 RESTARTABLE(::write(fd, addr, remaining), result); | |
| 111 if (result == OS_ERR) { | |
| 112 if (PrintMiscellaneous && Verbose) { | |
| 113 warning("Could not write Perfdata save file: %s: %s\n", | |
| 114 destfile, strerror(errno)); | |
| 115 } | |
| 116 break; | |
| 117 } | |
| 118 | |
| 119 remaining -= (size_t)result; | |
| 120 addr += result; | |
| 121 } | |
| 122 | |
|
10978
e95fc50106cf
7178026: os::close can restart ::close but that is not a restartable syscall
rdurbin
parents:
10969
diff
changeset
|
123 result = ::close(fd); |
| 0 | 124 if (PrintMiscellaneous && Verbose) { |
| 125 if (result == OS_ERR) { | |
| 126 warning("Could not close %s: %s\n", destfile, strerror(errno)); | |
| 127 } | |
| 128 } | |
| 129 } | |
| 6197 | 130 FREE_C_HEAP_ARRAY(char, destfile, mtInternal); |
| 0 | 131 } |
| 132 | |
| 133 | |
| 134 // Shared Memory Implementation Details | |
| 135 | |
| 136 // Note: the solaris and linux shared memory implementation uses the mmap | |
| 137 // interface with a backing store file to implement named shared memory. | |
| 138 // Using the file system as the name space for shared memory allows a | |
| 139 // common name space to be supported across a variety of platforms. It | |
| 140 // also provides a name space that Java applications can deal with through | |
| 141 // simple file apis. | |
| 142 // | |
| 143 // The solaris and linux implementations store the backing store file in | |
| 144 // a user specific temporary directory located in the /tmp file system, | |
| 145 // which is always a local file system and is sometimes a RAM based file | |
| 146 // system. | |
| 147 | |
| 148 // return the user specific temporary directory name. | |
| 149 // | |
| 150 // the caller is expected to free the allocated memory. | |
| 151 // | |
| 152 static char* get_user_tmp_dir(const char* user) { | |
| 153 | |
| 154 const char* tmpdir = os::get_temp_directory(); | |
| 155 const char* perfdir = PERFDATA_NAME; | |
|
1353
a2ea687fdc7c
6938627: Make temporary directory use property java.io.tmpdir when specified
coleenp
parents:
605
diff
changeset
|
156 size_t nbytes = strlen(tmpdir) + strlen(perfdir) + strlen(user) + 3; |
| 6197 | 157 char* dirname = NEW_C_HEAP_ARRAY(char, nbytes, mtInternal); |
| 0 | 158 |
| 159 // construct the path name to user specific tmp directory | |
|
1353
a2ea687fdc7c
6938627: Make temporary directory use property java.io.tmpdir when specified
coleenp
parents:
605
diff
changeset
|
160 snprintf(dirname, nbytes, "%s/%s_%s", tmpdir, perfdir, user); |
| 0 | 161 |
| 162 return dirname; | |
| 163 } | |
| 164 | |
| 165 // convert the given file name into a process id. if the file | |
| 166 // does not meet the file naming constraints, return 0. | |
| 167 // | |
| 168 static pid_t filename_to_pid(const char* filename) { | |
| 169 | |
| 170 // a filename that doesn't begin with a digit is not a | |
| 171 // candidate for conversion. | |
| 172 // | |
| 173 if (!isdigit(*filename)) { | |
| 174 return 0; | |
| 175 } | |
| 176 | |
| 177 // check if file name can be converted to an integer without | |
| 178 // any leftover characters. | |
| 179 // | |
| 180 char* remainder = NULL; | |
| 181 errno = 0; | |
| 182 pid_t pid = (pid_t)strtol(filename, &remainder, 10); | |
| 183 | |
| 184 if (errno != 0) { | |
| 185 return 0; | |
| 186 } | |
| 187 | |
| 188 // check for left over characters. If any, then the filename is | |
| 189 // not a candidate for conversion. | |
| 190 // | |
| 191 if (remainder != NULL && *remainder != '\0') { | |
| 192 return 0; | |
| 193 } | |
| 194 | |
| 195 // successful conversion, return the pid | |
| 196 return pid; | |
| 197 } | |
| 198 | |
| 199 | |
|
21816
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
200 // Check if the given statbuf is considered a secure directory for |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
201 // the backing store files. Returns true if the directory is considered |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
202 // a secure location. Returns false if the statbuf is a symbolic link or |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
203 // if an error occurred. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
204 // |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
205 static bool is_statbuf_secure(struct stat *statp) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
206 if (S_ISLNK(statp->st_mode) || !S_ISDIR(statp->st_mode)) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
207 // The path represents a link or some non-directory file type, |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
208 // which is not what we expected. Declare it insecure. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
209 // |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
210 return false; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
211 } |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
212 // We have an existing directory, check if the permissions are safe. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
213 // |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
214 if ((statp->st_mode & (S_IWGRP|S_IWOTH)) != 0) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
215 // The directory is open for writing and could be subjected |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
216 // to a symlink or a hard link attack. Declare it insecure. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
217 // |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
218 return false; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
219 } |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
220 // See if the uid of the directory matches the effective uid of the process. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
221 // |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
222 if (statp->st_uid != geteuid()) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
223 // The directory was not created by this user, declare it insecure. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
224 // |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
225 return false; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
226 } |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
227 return true; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
228 } |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
229 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
230 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
231 // Check if the given path is considered a secure directory for |
| 0 | 232 // the backing store files. Returns true if the directory exists |
| 233 // and is considered a secure location. Returns false if the path | |
| 605 | 234 // is a symbolic link or if an error occurred. |
| 0 | 235 // |
| 236 static bool is_directory_secure(const char* path) { | |
| 237 struct stat statbuf; | |
| 238 int result = 0; | |
| 239 | |
| 240 RESTARTABLE(::lstat(path, &statbuf), result); | |
| 241 if (result == OS_ERR) { | |
| 242 return false; | |
| 243 } | |
| 244 | |
|
21816
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
245 // The path exists, see if it is secure. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
246 return is_statbuf_secure(&statbuf); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
247 } |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
248 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
249 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
250 // Check if the given directory file descriptor is considered a secure |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
251 // directory for the backing store files. Returns true if the directory |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
252 // exists and is considered a secure location. Returns false if the path |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
253 // is a symbolic link or if an error occurred. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
254 // |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
255 static bool is_dirfd_secure(int dir_fd) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
256 struct stat statbuf; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
257 int result = 0; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
258 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
259 RESTARTABLE(::fstat(dir_fd, &statbuf), result); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
260 if (result == OS_ERR) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
261 return false; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
262 } |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
263 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
264 // The path exists, now check its mode. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
265 return is_statbuf_secure(&statbuf); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
266 } |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
267 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
268 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
269 // Check to make sure fd1 and fd2 are referencing the same file system object. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
270 // |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
271 static bool is_same_fsobject(int fd1, int fd2) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
272 struct stat statbuf1; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
273 struct stat statbuf2; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
274 int result = 0; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
275 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
276 RESTARTABLE(::fstat(fd1, &statbuf1), result); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
277 if (result == OS_ERR) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
278 return false; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
279 } |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
280 RESTARTABLE(::fstat(fd2, &statbuf2), result); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
281 if (result == OS_ERR) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
282 return false; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
283 } |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
284 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
285 if ((statbuf1.st_ino == statbuf2.st_ino) && |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
286 (statbuf1.st_dev == statbuf2.st_dev)) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
287 return true; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
288 } else { |
| 0 | 289 return false; |
| 290 } | |
|
21816
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
291 } |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
292 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
293 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
294 // Open the directory of the given path and validate it. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
295 // Return a DIR * of the open directory. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
296 // |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
297 static DIR *open_directory_secure(const char* dirname) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
298 // Open the directory using open() so that it can be verified |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
299 // to be secure by calling is_dirfd_secure(), opendir() and then check |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
300 // to see if they are the same file system object. This method does not |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
301 // introduce a window of opportunity for the directory to be attacked that |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
302 // calling opendir() and is_directory_secure() does. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
303 int result; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
304 DIR *dirp = NULL; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
305 RESTARTABLE(::open(dirname, O_RDONLY|O_NOFOLLOW), result); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
306 if (result == OS_ERR) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
307 // Directory doesn't exist or is a symlink, so there is nothing to cleanup. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
308 if (PrintMiscellaneous && Verbose) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
309 if (errno == ELOOP) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
310 warning("directory %s is a symlink and is not secure\n", dirname); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
311 } else { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
312 warning("could not open directory %s: %s\n", dirname, strerror(errno)); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
313 } |
| 0 | 314 } |
|
21816
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
315 return dirp; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
316 } |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
317 int fd = result; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
318 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
319 // Determine if the open directory is secure. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
320 if (!is_dirfd_secure(fd)) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
321 // The directory is not a secure directory. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
322 os::close(fd); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
323 return dirp; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
324 } |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
325 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
326 // Open the directory. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
327 dirp = ::opendir(dirname); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
328 if (dirp == NULL) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
329 // The directory doesn't exist, close fd and return. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
330 os::close(fd); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
331 return dirp; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
332 } |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
333 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
334 // Check to make sure fd and dirp are referencing the same file system object. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
335 if (!is_same_fsobject(fd, dirfd(dirp))) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
336 // The directory is not secure. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
337 os::close(fd); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
338 os::closedir(dirp); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
339 dirp = NULL; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
340 return dirp; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
341 } |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
342 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
343 // Close initial open now that we know directory is secure |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
344 os::close(fd); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
345 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
346 return dirp; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
347 } |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
348 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
349 // NOTE: The code below uses fchdir(), open() and unlink() because |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
350 // fdopendir(), openat() and unlinkat() are not supported on all |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
351 // versions. Once the support for fdopendir(), openat() and unlinkat() |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
352 // is available on all supported versions the code can be changed |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
353 // to use these functions. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
354 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
355 // Open the directory of the given path, validate it and set the |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
356 // current working directory to it. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
357 // Return a DIR * of the open directory and the saved cwd fd. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
358 // |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
359 static DIR *open_directory_secure_cwd(const char* dirname, int *saved_cwd_fd) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
360 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
361 // Open the directory. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
362 DIR* dirp = open_directory_secure(dirname); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
363 if (dirp == NULL) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
364 // Directory doesn't exist or is insecure, so there is nothing to cleanup. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
365 return dirp; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
366 } |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
367 int fd = dirfd(dirp); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
368 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
369 // Open a fd to the cwd and save it off. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
370 int result; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
371 RESTARTABLE(::open(".", O_RDONLY), result); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
372 if (result == OS_ERR) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
373 *saved_cwd_fd = -1; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
374 } else { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
375 *saved_cwd_fd = result; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
376 } |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
377 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
378 // Set the current directory to dirname by using the fd of the directory. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
379 result = fchdir(fd); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
380 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
381 return dirp; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
382 } |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
383 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
384 // Close the directory and restore the current working directory. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
385 // |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
386 static void close_directory_secure_cwd(DIR* dirp, int saved_cwd_fd) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
387 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
388 int result; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
389 // If we have a saved cwd change back to it and close the fd. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
390 if (saved_cwd_fd != -1) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
391 result = fchdir(saved_cwd_fd); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
392 ::close(saved_cwd_fd); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
393 } |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
394 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
395 // Close the directory. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
396 os::closedir(dirp); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
397 } |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
398 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
399 // Check if the given file descriptor is considered a secure. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
400 // |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
401 static bool is_file_secure(int fd, const char *filename) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
402 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
403 int result; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
404 struct stat statbuf; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
405 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
406 // Determine if the file is secure. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
407 RESTARTABLE(::fstat(fd, &statbuf), result); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
408 if (result == OS_ERR) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
409 if (PrintMiscellaneous && Verbose) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
410 warning("fstat failed on %s: %s\n", filename, strerror(errno)); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
411 } |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
412 return false; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
413 } |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
414 if (statbuf.st_nlink > 1) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
415 // A file with multiple links is not expected. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
416 if (PrintMiscellaneous && Verbose) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
417 warning("file %s has multiple links\n", filename); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
418 } |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
419 return false; |
| 0 | 420 } |
| 421 return true; | |
| 422 } | |
| 423 | |
| 424 | |
| 425 // return the user name for the given user id | |
| 426 // | |
| 427 // the caller is expected to free the allocated memory. | |
| 428 // | |
| 429 static char* get_user_name(uid_t uid) { | |
| 430 | |
| 431 struct passwd pwent; | |
| 432 | |
| 433 // determine the max pwbuf size from sysconf, and hardcode | |
| 434 // a default if this not available through sysconf. | |
| 435 // | |
| 436 long bufsize = sysconf(_SC_GETPW_R_SIZE_MAX); | |
| 437 if (bufsize == -1) | |
| 438 bufsize = 1024; | |
| 439 | |
| 6197 | 440 char* pwbuf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); |
| 0 | 441 |
| 442 // POSIX interface to getpwuid_r is used on LINUX | |
| 443 struct passwd* p; | |
| 444 int result = getpwuid_r(uid, &pwent, pwbuf, (size_t)bufsize, &p); | |
| 445 | |
| 446 if (result != 0 || p == NULL || p->pw_name == NULL || *(p->pw_name) == '\0') { | |
| 447 if (PrintMiscellaneous && Verbose) { | |
| 448 if (result != 0) { | |
| 449 warning("Could not retrieve passwd entry: %s\n", | |
| 450 strerror(result)); | |
| 451 } | |
| 452 else if (p == NULL) { | |
| 453 // this check is added to protect against an observed problem | |
| 454 // with getpwuid_r() on RedHat 9 where getpwuid_r returns 0, | |
| 455 // indicating success, but has p == NULL. This was observed when | |
| 456 // inserting a file descriptor exhaustion fault prior to the call | |
| 457 // getpwuid_r() call. In this case, error is set to the appropriate | |
| 458 // error condition, but this is undocumented behavior. This check | |
| 459 // is safe under any condition, but the use of errno in the output | |
| 460 // message may result in an erroneous message. | |
| 461 // Bug Id 89052 was opened with RedHat. | |
| 462 // | |
| 463 warning("Could not retrieve passwd entry: %s\n", | |
| 464 strerror(errno)); | |
| 465 } | |
| 466 else { | |
| 467 warning("Could not determine user name: %s\n", | |
| 468 p->pw_name == NULL ? "pw_name = NULL" : | |
| 469 "pw_name zero length"); | |
| 470 } | |
| 471 } | |
| 6197 | 472 FREE_C_HEAP_ARRAY(char, pwbuf, mtInternal); |
| 0 | 473 return NULL; |
| 474 } | |
| 475 | |
| 6197 | 476 char* user_name = NEW_C_HEAP_ARRAY(char, strlen(p->pw_name) + 1, mtInternal); |
| 0 | 477 strcpy(user_name, p->pw_name); |
| 478 | |
| 6197 | 479 FREE_C_HEAP_ARRAY(char, pwbuf, mtInternal); |
| 0 | 480 return user_name; |
| 481 } | |
| 482 | |
| 483 // return the name of the user that owns the process identified by vmid. | |
| 484 // | |
| 485 // This method uses a slow directory search algorithm to find the backing | |
| 486 // store file for the specified vmid and returns the user name, as determined | |
| 487 // by the user name suffix of the hsperfdata_<username> directory name. | |
| 488 // | |
| 489 // the caller is expected to free the allocated memory. | |
| 490 // | |
| 491 static char* get_user_name_slow(int vmid, TRAPS) { | |
| 492 | |
| 493 // short circuit the directory search if the process doesn't even exist. | |
| 494 if (kill(vmid, 0) == OS_ERR) { | |
| 495 if (errno == ESRCH) { | |
| 496 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), | |
| 497 "Process not found"); | |
| 498 } | |
| 499 else /* EPERM */ { | |
| 500 THROW_MSG_0(vmSymbols::java_io_IOException(), strerror(errno)); | |
| 501 } | |
| 502 } | |
| 503 | |
| 504 // directory search | |
| 505 char* oldest_user = NULL; | |
| 506 time_t oldest_ctime = 0; | |
| 507 | |
| 508 const char* tmpdirname = os::get_temp_directory(); | |
| 509 | |
|
21816
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
510 // open the temp directory |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
511 DIR* tmpdirp = open_directory_secure(tmpdirname); |
| 0 | 512 if (tmpdirp == NULL) { |
|
21816
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
513 // Cannot open the directory to get the user name, return. |
| 0 | 514 return NULL; |
| 515 } | |
| 516 | |
| 517 // for each entry in the directory that matches the pattern hsperfdata_*, | |
| 518 // open the directory and check if the file for the given vmid exists. | |
| 519 // The file with the expected name and the latest creation date is used | |
| 520 // to determine the user name for the process id. | |
| 521 // | |
| 522 struct dirent* dentry; | |
| 6197 | 523 char* tdbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(tmpdirname), mtInternal); |
| 0 | 524 errno = 0; |
| 525 while ((dentry = os::readdir(tmpdirp, (struct dirent *)tdbuf)) != NULL) { | |
| 526 | |
| 527 // check if the directory entry is a hsperfdata file | |
| 528 if (strncmp(dentry->d_name, PERFDATA_NAME, strlen(PERFDATA_NAME)) != 0) { | |
| 529 continue; | |
| 530 } | |
| 531 | |
| 532 char* usrdir_name = NEW_C_HEAP_ARRAY(char, | |
| 6197 | 533 strlen(tmpdirname) + strlen(dentry->d_name) + 2, mtInternal); |
| 0 | 534 strcpy(usrdir_name, tmpdirname); |
|
1353
a2ea687fdc7c
6938627: Make temporary directory use property java.io.tmpdir when specified
coleenp
parents:
605
diff
changeset
|
535 strcat(usrdir_name, "/"); |
| 0 | 536 strcat(usrdir_name, dentry->d_name); |
| 537 | |
|
21816
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
538 // open the user directory |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
539 DIR* subdirp = open_directory_secure(usrdir_name); |
| 0 | 540 |
| 541 if (subdirp == NULL) { | |
| 6197 | 542 FREE_C_HEAP_ARRAY(char, usrdir_name, mtInternal); |
| 0 | 543 continue; |
| 544 } | |
| 545 | |
| 546 // Since we don't create the backing store files in directories | |
| 547 // pointed to by symbolic links, we also don't follow them when | |
| 548 // looking for the files. We check for a symbolic link after the | |
| 549 // call to opendir in order to eliminate a small window where the | |
| 550 // symlink can be exploited. | |
| 551 // | |
| 552 if (!is_directory_secure(usrdir_name)) { | |
| 6197 | 553 FREE_C_HEAP_ARRAY(char, usrdir_name, mtInternal); |
| 0 | 554 os::closedir(subdirp); |
| 555 continue; | |
| 556 } | |
| 557 | |
| 558 struct dirent* udentry; | |
| 6197 | 559 char* udbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(usrdir_name), mtInternal); |
| 0 | 560 errno = 0; |
| 561 while ((udentry = os::readdir(subdirp, (struct dirent *)udbuf)) != NULL) { | |
| 562 | |
| 563 if (filename_to_pid(udentry->d_name) == vmid) { | |
| 564 struct stat statbuf; | |
| 565 int result; | |
| 566 | |
| 567 char* filename = NEW_C_HEAP_ARRAY(char, | |
| 6197 | 568 strlen(usrdir_name) + strlen(udentry->d_name) + 2, mtInternal); |
| 0 | 569 |
| 570 strcpy(filename, usrdir_name); | |
| 571 strcat(filename, "/"); | |
| 572 strcat(filename, udentry->d_name); | |
| 573 | |
| 574 // don't follow symbolic links for the file | |
| 575 RESTARTABLE(::lstat(filename, &statbuf), result); | |
| 576 if (result == OS_ERR) { | |
| 6197 | 577 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
| 0 | 578 continue; |
| 579 } | |
| 580 | |
| 581 // skip over files that are not regular files. | |
| 582 if (!S_ISREG(statbuf.st_mode)) { | |
| 6197 | 583 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
| 0 | 584 continue; |
| 585 } | |
| 586 | |
| 587 // compare and save filename with latest creation time | |
| 588 if (statbuf.st_size > 0 && statbuf.st_ctime > oldest_ctime) { | |
| 589 | |
| 590 if (statbuf.st_ctime > oldest_ctime) { | |
| 591 char* user = strchr(dentry->d_name, '_') + 1; | |
| 592 | |
| 6197 | 593 if (oldest_user != NULL) FREE_C_HEAP_ARRAY(char, oldest_user, mtInternal); |
| 594 oldest_user = NEW_C_HEAP_ARRAY(char, strlen(user)+1, mtInternal); | |
| 0 | 595 |
| 596 strcpy(oldest_user, user); | |
| 597 oldest_ctime = statbuf.st_ctime; | |
| 598 } | |
| 599 } | |
| 600 | |
| 6197 | 601 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
| 0 | 602 } |
| 603 } | |
| 604 os::closedir(subdirp); | |
| 6197 | 605 FREE_C_HEAP_ARRAY(char, udbuf, mtInternal); |
| 606 FREE_C_HEAP_ARRAY(char, usrdir_name, mtInternal); | |
| 0 | 607 } |
| 608 os::closedir(tmpdirp); | |
| 6197 | 609 FREE_C_HEAP_ARRAY(char, tdbuf, mtInternal); |
| 0 | 610 |
| 611 return(oldest_user); | |
| 612 } | |
| 613 | |
| 614 // return the name of the user that owns the JVM indicated by the given vmid. | |
| 615 // | |
| 616 static char* get_user_name(int vmid, TRAPS) { | |
| 617 return get_user_name_slow(vmid, CHECK_NULL); | |
| 618 } | |
| 619 | |
| 620 // return the file name of the backing store file for the named | |
| 621 // shared memory region for the given user name and vmid. | |
| 622 // | |
| 623 // the caller is expected to free the allocated memory. | |
| 624 // | |
| 625 static char* get_sharedmem_filename(const char* dirname, int vmid) { | |
| 626 | |
| 627 // add 2 for the file separator and a null terminator. | |
| 628 size_t nbytes = strlen(dirname) + UINT_CHARS + 2; | |
| 629 | |
| 6197 | 630 char* name = NEW_C_HEAP_ARRAY(char, nbytes, mtInternal); |
| 0 | 631 snprintf(name, nbytes, "%s/%d", dirname, vmid); |
| 632 | |
| 633 return name; | |
| 634 } | |
| 635 | |
| 636 | |
| 637 // remove file | |
| 638 // | |
| 639 // this method removes the file specified by the given path | |
| 640 // | |
| 641 static void remove_file(const char* path) { | |
| 642 | |
| 643 int result; | |
| 644 | |
| 645 // if the file is a directory, the following unlink will fail. since | |
| 646 // we don't expect to find directories in the user temp directory, we | |
| 647 // won't try to handle this situation. even if accidentially or | |
| 648 // maliciously planted, the directory's presence won't hurt anything. | |
| 649 // | |
| 650 RESTARTABLE(::unlink(path), result); | |
| 651 if (PrintMiscellaneous && Verbose && result == OS_ERR) { | |
| 652 if (errno != ENOENT) { | |
| 653 warning("Could not unlink shared memory backing" | |
| 654 " store file %s : %s\n", path, strerror(errno)); | |
| 655 } | |
| 656 } | |
| 657 } | |
| 658 | |
| 659 | |
| 660 // cleanup stale shared memory resources | |
| 661 // | |
| 662 // This method attempts to remove all stale shared memory files in | |
| 663 // the named user temporary directory. It scans the named directory | |
| 664 // for files matching the pattern ^$[0-9]*$. For each file found, the | |
| 665 // process id is extracted from the file name and a test is run to | |
| 666 // determine if the process is alive. If the process is not alive, | |
| 667 // any stale file resources are removed. | |
| 668 // | |
| 669 static void cleanup_sharedmem_resources(const char* dirname) { | |
| 670 | |
|
21816
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
671 int saved_cwd_fd; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
672 // open the directory |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
673 DIR* dirp = open_directory_secure_cwd(dirname, &saved_cwd_fd); |
| 0 | 674 if (dirp == NULL) { |
|
21816
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
675 // directory doesn't exist or is insecure, so there is nothing to cleanup |
| 0 | 676 return; |
| 677 } | |
| 678 | |
| 679 // for each entry in the directory that matches the expected file | |
| 680 // name pattern, determine if the file resources are stale and if | |
| 681 // so, remove the file resources. Note, instrumented HotSpot processes | |
| 682 // for this user may start and/or terminate during this search and | |
| 683 // remove or create new files in this directory. The behavior of this | |
| 684 // loop under these conditions is dependent upon the implementation of | |
| 685 // opendir/readdir. | |
| 686 // | |
| 687 struct dirent* entry; | |
| 6197 | 688 char* dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(dirname), mtInternal); |
|
21816
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
689 |
| 0 | 690 errno = 0; |
| 691 while ((entry = os::readdir(dirp, (struct dirent *)dbuf)) != NULL) { | |
| 692 | |
| 693 pid_t pid = filename_to_pid(entry->d_name); | |
| 694 | |
| 695 if (pid == 0) { | |
| 696 | |
| 697 if (strcmp(entry->d_name, ".") != 0 && strcmp(entry->d_name, "..") != 0) { | |
| 698 // attempt to remove all unexpected files, except "." and ".." | |
|
21816
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
699 unlink(entry->d_name); |
| 0 | 700 } |
| 701 | |
| 702 errno = 0; | |
| 703 continue; | |
| 704 } | |
| 705 | |
| 706 // we now have a file name that converts to a valid integer | |
| 707 // that could represent a process id . if this process id | |
| 708 // matches the current process id or the process is not running, | |
| 709 // then remove the stale file resources. | |
| 710 // | |
| 711 // process liveness is detected by sending signal number 0 to | |
| 712 // the process id (see kill(2)). if kill determines that the | |
| 713 // process does not exist, then the file resources are removed. | |
| 714 // if kill determines that that we don't have permission to | |
| 715 // signal the process, then the file resources are assumed to | |
| 716 // be stale and are removed because the resources for such a | |
| 717 // process should be in a different user specific directory. | |
| 718 // | |
| 719 if ((pid == os::current_process_id()) || | |
| 720 (kill(pid, 0) == OS_ERR && (errno == ESRCH || errno == EPERM))) { | |
|
21816
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
721 unlink(entry->d_name); |
| 0 | 722 } |
| 723 errno = 0; | |
| 724 } | |
|
21816
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
725 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
726 // close the directory and reset the current working directory |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
727 close_directory_secure_cwd(dirp, saved_cwd_fd); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
728 |
| 6197 | 729 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); |
| 0 | 730 } |
| 731 | |
| 732 // make the user specific temporary directory. Returns true if | |
| 733 // the directory exists and is secure upon return. Returns false | |
| 734 // if the directory exists but is either a symlink, is otherwise | |
| 735 // insecure, or if an error occurred. | |
| 736 // | |
| 737 static bool make_user_tmp_dir(const char* dirname) { | |
| 738 | |
| 739 // create the directory with 0755 permissions. note that the directory | |
| 740 // will be owned by euid::egid, which may not be the same as uid::gid. | |
| 741 // | |
| 742 if (mkdir(dirname, S_IRWXU|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH) == OS_ERR) { | |
| 743 if (errno == EEXIST) { | |
| 744 // The directory already exists and was probably created by another | |
| 745 // JVM instance. However, this could also be the result of a | |
| 746 // deliberate symlink. Verify that the existing directory is safe. | |
| 747 // | |
| 748 if (!is_directory_secure(dirname)) { | |
| 749 // directory is not secure | |
| 750 if (PrintMiscellaneous && Verbose) { | |
| 751 warning("%s directory is insecure\n", dirname); | |
| 752 } | |
| 753 return false; | |
| 754 } | |
| 755 } | |
| 756 else { | |
| 757 // we encountered some other failure while attempting | |
| 758 // to create the directory | |
| 759 // | |
| 760 if (PrintMiscellaneous && Verbose) { | |
| 761 warning("could not create directory %s: %s\n", | |
| 762 dirname, strerror(errno)); | |
| 763 } | |
| 764 return false; | |
| 765 } | |
| 766 } | |
| 767 return true; | |
| 768 } | |
| 769 | |
| 770 // create the shared memory file resources | |
| 771 // | |
| 772 // This method creates the shared memory file with the given size | |
| 773 // This method also creates the user specific temporary directory, if | |
| 774 // it does not yet exist. | |
| 775 // | |
| 776 static int create_sharedmem_resources(const char* dirname, const char* filename, size_t size) { | |
| 777 | |
| 778 // make the user temporary directory | |
| 779 if (!make_user_tmp_dir(dirname)) { | |
| 780 // could not make/find the directory or the found directory | |
| 781 // was not secure | |
| 782 return -1; | |
| 783 } | |
| 784 | |
|
21816
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
785 int saved_cwd_fd; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
786 // open the directory and set the current working directory to it |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
787 DIR* dirp = open_directory_secure_cwd(dirname, &saved_cwd_fd); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
788 if (dirp == NULL) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
789 // Directory doesn't exist or is insecure, so cannot create shared |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
790 // memory file. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
791 return -1; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
792 } |
| 0 | 793 |
|
21816
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
794 // Open the filename in the current directory. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
795 // Cannot use O_TRUNC here; truncation of an existing file has to happen |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
796 // after the is_file_secure() check below. |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
797 int result; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
798 RESTARTABLE(::open(filename, O_RDWR|O_CREAT|O_NOFOLLOW, S_IREAD|S_IWRITE), result); |
| 0 | 799 if (result == OS_ERR) { |
| 800 if (PrintMiscellaneous && Verbose) { | |
|
21816
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
801 if (errno == ELOOP) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
802 warning("file %s is a symlink and is not secure\n", filename); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
803 } else { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
804 warning("could not create file %s: %s\n", filename, strerror(errno)); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
805 } |
| 0 | 806 } |
|
21816
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
807 // close the directory and reset the current working directory |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
808 close_directory_secure_cwd(dirp, saved_cwd_fd); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
809 |
| 0 | 810 return -1; |
| 811 } | |
|
21816
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
812 // close the directory and reset the current working directory |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
813 close_directory_secure_cwd(dirp, saved_cwd_fd); |
| 0 | 814 |
| 815 // save the file descriptor | |
| 816 int fd = result; | |
| 817 | |
|
21816
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
818 // check to see if the file is secure |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
819 if (!is_file_secure(fd, filename)) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
820 ::close(fd); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
821 return -1; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
822 } |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
823 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
824 // truncate the file to get rid of any existing data |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
825 RESTARTABLE(::ftruncate(fd, (off_t)0), result); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
826 if (result == OS_ERR) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
827 if (PrintMiscellaneous && Verbose) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
828 warning("could not truncate shared memory file: %s\n", strerror(errno)); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
829 } |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
830 ::close(fd); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
831 return -1; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
832 } |
| 0 | 833 // set the file size |
| 834 RESTARTABLE(::ftruncate(fd, (off_t)size), result); | |
| 835 if (result == OS_ERR) { | |
| 836 if (PrintMiscellaneous && Verbose) { | |
| 837 warning("could not set shared memory file size: %s\n", strerror(errno)); | |
| 838 } | |
|
10978
e95fc50106cf
7178026: os::close can restart ::close but that is not a restartable syscall
rdurbin
parents:
10969
diff
changeset
|
839 ::close(fd); |
| 0 | 840 return -1; |
| 841 } | |
| 842 | |
|
2066
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
843 // Verify that we have enough disk space for this file. |
|
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
844 // We'll get random SIGBUS crashes on memory accesses if |
|
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
845 // we don't. |
|
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
846 |
|
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
847 for (size_t seekpos = 0; seekpos < size; seekpos += os::vm_page_size()) { |
|
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
848 int zero_int = 0; |
|
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
849 result = (int)os::seek_to_file_offset(fd, (jlong)(seekpos)); |
|
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
850 if (result == -1 ) break; |
|
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
851 RESTARTABLE(::write(fd, &zero_int, 1), result); |
|
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
852 if (result != 1) { |
|
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
853 if (errno == ENOSPC) { |
|
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
854 warning("Insufficient space for shared memory file:\n %s\nTry using the -Djava.io.tmpdir= option to select an alternate temp location.\n", filename); |
|
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
855 } |
|
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
856 break; |
|
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
857 } |
|
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
858 } |
|
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
859 |
|
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
860 if (result != -1) { |
|
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
861 return fd; |
|
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
862 } else { |
|
10978
e95fc50106cf
7178026: os::close can restart ::close but that is not a restartable syscall
rdurbin
parents:
10969
diff
changeset
|
863 ::close(fd); |
|
2066
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
864 return -1; |
|
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
865 } |
| 0 | 866 } |
| 867 | |
| 868 // open the shared memory file for the given user and vmid. returns | |
| 869 // the file descriptor for the open file or -1 if the file could not | |
| 870 // be opened. | |
| 871 // | |
| 872 static int open_sharedmem_file(const char* filename, int oflags, TRAPS) { | |
| 873 | |
| 874 // open the file | |
| 875 int result; | |
| 876 RESTARTABLE(::open(filename, oflags), result); | |
| 877 if (result == OS_ERR) { | |
| 878 if (errno == ENOENT) { | |
|
9064
4b7cf00ccb08
8006001: [parfait] Possible file leak in hotspot/src/os/linux/vm/perfMemory_linux.cpp
ccheung
parents:
6882
diff
changeset
|
879 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), |
|
4b7cf00ccb08
8006001: [parfait] Possible file leak in hotspot/src/os/linux/vm/perfMemory_linux.cpp
ccheung
parents:
6882
diff
changeset
|
880 "Process not found", OS_ERR); |
| 0 | 881 } |
| 882 else if (errno == EACCES) { | |
|
9064
4b7cf00ccb08
8006001: [parfait] Possible file leak in hotspot/src/os/linux/vm/perfMemory_linux.cpp
ccheung
parents:
6882
diff
changeset
|
883 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), |
|
4b7cf00ccb08
8006001: [parfait] Possible file leak in hotspot/src/os/linux/vm/perfMemory_linux.cpp
ccheung
parents:
6882
diff
changeset
|
884 "Permission denied", OS_ERR); |
| 0 | 885 } |
| 886 else { | |
|
9064
4b7cf00ccb08
8006001: [parfait] Possible file leak in hotspot/src/os/linux/vm/perfMemory_linux.cpp
ccheung
parents:
6882
diff
changeset
|
887 THROW_MSG_(vmSymbols::java_io_IOException(), strerror(errno), OS_ERR); |
| 0 | 888 } |
| 889 } | |
|
21816
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
890 int fd = result; |
| 0 | 891 |
|
21816
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
892 // check to see if the file is secure |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
893 if (!is_file_secure(fd, filename)) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
894 ::close(fd); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
895 return -1; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
896 } |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
897 |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
898 return fd; |
| 0 | 899 } |
| 900 | |
| 901 // create a named shared memory region. returns the address of the | |
| 902 // memory region on success or NULL on failure. A return value of | |
| 903 // NULL will ultimately disable the shared memory feature. | |
| 904 // | |
| 905 // On Solaris and Linux, the name space for shared memory objects | |
| 906 // is the file system name space. | |
| 907 // | |
| 908 // A monitoring application attaching to a JVM does not need to know | |
| 909 // the file system name of the shared memory object. However, it may | |
| 910 // be convenient for applications to discover the existence of newly | |
| 911 // created and terminating JVMs by watching the file system name space | |
| 912 // for files being created or removed. | |
| 913 // | |
| 914 static char* mmap_create_shared(size_t size) { | |
| 915 | |
| 916 int result; | |
| 917 int fd; | |
| 918 char* mapAddress; | |
| 919 | |
| 920 int vmid = os::current_process_id(); | |
| 921 | |
| 922 char* user_name = get_user_name(geteuid()); | |
| 923 | |
| 924 if (user_name == NULL) | |
| 925 return NULL; | |
| 926 | |
| 927 char* dirname = get_user_tmp_dir(user_name); | |
| 928 char* filename = get_sharedmem_filename(dirname, vmid); | |
|
21816
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
929 // get the short filename |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
930 char* short_filename = strrchr(filename, '/'); |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
931 if (short_filename == NULL) { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
932 short_filename = filename; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
933 } else { |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
934 short_filename++; |
|
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
935 } |
| 0 | 936 |
| 937 // cleanup any stale shared memory files | |
| 938 cleanup_sharedmem_resources(dirname); | |
| 939 | |
| 940 assert(((size > 0) && (size % os::vm_page_size() == 0)), | |
| 941 "unexpected PerfMemory region size"); | |
| 942 | |
|
21816
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
943 fd = create_sharedmem_resources(dirname, short_filename, size); |
| 0 | 944 |
| 6197 | 945 FREE_C_HEAP_ARRAY(char, user_name, mtInternal); |
| 946 FREE_C_HEAP_ARRAY(char, dirname, mtInternal); | |
| 0 | 947 |
| 948 if (fd == -1) { | |
| 6197 | 949 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
| 0 | 950 return NULL; |
| 951 } | |
| 952 | |
| 953 mapAddress = (char*)::mmap((char*)0, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0); | |
| 954 | |
|
10978
e95fc50106cf
7178026: os::close can restart ::close but that is not a restartable syscall
rdurbin
parents:
10969
diff
changeset
|
955 result = ::close(fd); |
| 0 | 956 assert(result != OS_ERR, "could not close file"); |
| 957 | |
| 958 if (mapAddress == MAP_FAILED) { | |
| 959 if (PrintMiscellaneous && Verbose) { | |
| 960 warning("mmap failed - %s\n", strerror(errno)); | |
| 961 } | |
| 962 remove_file(filename); | |
| 6197 | 963 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
| 0 | 964 return NULL; |
| 965 } | |
| 966 | |
| 967 // save the file name for use in delete_shared_memory() | |
| 968 backing_store_file_name = filename; | |
| 969 | |
| 970 // clear the shared memory region | |
| 971 (void)::memset((void*) mapAddress, 0, size); | |
| 972 | |
|
6882
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
zgu
parents:
6842
diff
changeset
|
973 // it does not go through os api, the operation has to record from here |
|
10986
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10978
diff
changeset
|
974 MemTracker::record_virtual_memory_reserve((address)mapAddress, size, mtInternal, CURRENT_PC); |
|
6882
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
zgu
parents:
6842
diff
changeset
|
975 |
| 0 | 976 return mapAddress; |
| 977 } | |
| 978 | |
| 979 // release a named shared memory region | |
| 980 // | |
| 981 static void unmap_shared(char* addr, size_t bytes) { | |
| 982 os::release_memory(addr, bytes); | |
| 983 } | |
| 984 | |
| 985 // create the PerfData memory region in shared memory. | |
| 986 // | |
| 987 static char* create_shared_memory(size_t size) { | |
| 988 | |
| 989 // create the shared memory region. | |
| 990 return mmap_create_shared(size); | |
| 991 } | |
| 992 | |
| 993 // delete the shared PerfData memory region | |
| 994 // | |
| 995 static void delete_shared_memory(char* addr, size_t size) { | |
| 996 | |
| 997 // cleanup the persistent shared memory resources. since DestroyJavaVM does | |
| 998 // not support unloading of the JVM, unmapping of the memory resource is | |
| 999 // not performed. The memory will be reclaimed by the OS upon termination of | |
| 1000 // the process. The backing store file is deleted from the file system. | |
| 1001 | |
| 1002 assert(!PerfDisableSharedMem, "shouldn't be here"); | |
| 1003 | |
| 1004 if (backing_store_file_name != NULL) { | |
| 1005 remove_file(backing_store_file_name); | |
| 1006 // Don't.. Free heap memory could deadlock os::abort() if it is called | |
| 1007 // from signal handler. OS will reclaim the heap memory. | |
| 1008 // FREE_C_HEAP_ARRAY(char, backing_store_file_name); | |
| 1009 backing_store_file_name = NULL; | |
| 1010 } | |
| 1011 } | |
| 1012 | |
| 1013 // return the size of the file for the given file descriptor | |
| 1014 // or 0 if it is not a valid size for a shared memory file | |
| 1015 // | |
| 1016 static size_t sharedmem_filesize(int fd, TRAPS) { | |
| 1017 | |
| 1018 struct stat statbuf; | |
| 1019 int result; | |
| 1020 | |
| 1021 RESTARTABLE(::fstat(fd, &statbuf), result); | |
| 1022 if (result == OS_ERR) { | |
| 1023 if (PrintMiscellaneous && Verbose) { | |
| 1024 warning("fstat failed: %s\n", strerror(errno)); | |
| 1025 } | |
| 1026 THROW_MSG_0(vmSymbols::java_io_IOException(), | |
| 1027 "Could not determine PerfMemory size"); | |
| 1028 } | |
| 1029 | |
| 1030 if ((statbuf.st_size == 0) || | |
| 1031 ((size_t)statbuf.st_size % os::vm_page_size() != 0)) { | |
| 1032 THROW_MSG_0(vmSymbols::java_lang_Exception(), | |
| 1033 "Invalid PerfMemory size"); | |
| 1034 } | |
| 1035 | |
| 1036 return (size_t)statbuf.st_size; | |
| 1037 } | |
| 1038 | |
| 1039 // attach to a named shared memory region. | |
| 1040 // | |
| 1041 static void mmap_attach_shared(const char* user, int vmid, PerfMemory::PerfMemoryMode mode, char** addr, size_t* sizep, TRAPS) { | |
| 1042 | |
| 1043 char* mapAddress; | |
| 1044 int result; | |
| 1045 int fd; | |
|
9064
4b7cf00ccb08
8006001: [parfait] Possible file leak in hotspot/src/os/linux/vm/perfMemory_linux.cpp
ccheung
parents:
6882
diff
changeset
|
1046 size_t size = 0; |
| 0 | 1047 const char* luser = NULL; |
| 1048 | |
| 1049 int mmap_prot; | |
| 1050 int file_flags; | |
| 1051 | |
| 1052 ResourceMark rm; | |
| 1053 | |
| 1054 // map the high level access mode to the appropriate permission | |
| 1055 // constructs for the file and the shared memory mapping. | |
| 1056 if (mode == PerfMemory::PERF_MODE_RO) { | |
| 1057 mmap_prot = PROT_READ; | |
|
21816
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
1058 file_flags = O_RDONLY | O_NOFOLLOW; |
| 0 | 1059 } |
| 1060 else if (mode == PerfMemory::PERF_MODE_RW) { | |
| 1061 #ifdef LATER | |
| 1062 mmap_prot = PROT_READ | PROT_WRITE; | |
|
21816
60a992c821f8
8050807: Better performing performance data handling
hseigel
parents:
17937
diff
changeset
|
1063 file_flags = O_RDWR | O_NOFOLLOW; |
| 0 | 1064 #else |
| 1065 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), | |
| 1066 "Unsupported access mode"); | |
| 1067 #endif | |
| 1068 } | |
| 1069 else { | |
| 1070 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), | |
| 1071 "Illegal access mode"); | |
| 1072 } | |
| 1073 | |
| 1074 if (user == NULL || strlen(user) == 0) { | |
| 1075 luser = get_user_name(vmid, CHECK); | |
| 1076 } | |
| 1077 else { | |
| 1078 luser = user; | |
| 1079 } | |
| 1080 | |
| 1081 if (luser == NULL) { | |
| 1082 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), | |
| 1083 "Could not map vmid to user Name"); | |
| 1084 } | |
| 1085 | |
| 1086 char* dirname = get_user_tmp_dir(luser); | |
| 1087 | |
| 1088 // since we don't follow symbolic links when creating the backing | |
| 1089 // store file, we don't follow them when attaching either. | |
| 1090 // | |
| 1091 if (!is_directory_secure(dirname)) { | |
| 6197 | 1092 FREE_C_HEAP_ARRAY(char, dirname, mtInternal); |
| 0 | 1093 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), |
| 1094 "Process not found"); | |
| 1095 } | |
| 1096 | |
| 1097 char* filename = get_sharedmem_filename(dirname, vmid); | |
| 1098 | |
| 1099 // copy heap memory to resource memory. the open_sharedmem_file | |
| 1100 // method below need to use the filename, but could throw an | |
| 1101 // exception. using a resource array prevents the leak that | |
| 1102 // would otherwise occur. | |
| 1103 char* rfilename = NEW_RESOURCE_ARRAY(char, strlen(filename) + 1); | |
| 1104 strcpy(rfilename, filename); | |
| 1105 | |
| 1106 // free the c heap resources that are no longer needed | |
| 6197 | 1107 if (luser != user) FREE_C_HEAP_ARRAY(char, luser, mtInternal); |
| 1108 FREE_C_HEAP_ARRAY(char, dirname, mtInternal); | |
| 1109 FREE_C_HEAP_ARRAY(char, filename, mtInternal); | |
| 0 | 1110 |
| 1111 // open the shared memory file for the give vmid | |
| 17765 | 1112 fd = open_sharedmem_file(rfilename, file_flags, THREAD); |
| 1113 | |
| 1114 if (fd == OS_ERR) { | |
| 1115 return; | |
| 1116 } | |
| 1117 | |
| 1118 if (HAS_PENDING_EXCEPTION) { | |
| 1119 ::close(fd); | |
| 1120 return; | |
| 1121 } | |
| 0 | 1122 |
| 1123 if (*sizep == 0) { | |
| 1124 size = sharedmem_filesize(fd, CHECK); | |
|
9064
4b7cf00ccb08
8006001: [parfait] Possible file leak in hotspot/src/os/linux/vm/perfMemory_linux.cpp
ccheung
parents:
6882
diff
changeset
|
1125 } else { |
|
4b7cf00ccb08
8006001: [parfait] Possible file leak in hotspot/src/os/linux/vm/perfMemory_linux.cpp
ccheung
parents:
6882
diff
changeset
|
1126 size = *sizep; |
| 0 | 1127 } |
| 1128 | |
|
9064
4b7cf00ccb08
8006001: [parfait] Possible file leak in hotspot/src/os/linux/vm/perfMemory_linux.cpp
ccheung
parents:
6882
diff
changeset
|
1129 assert(size > 0, "unexpected size <= 0"); |
|
4b7cf00ccb08
8006001: [parfait] Possible file leak in hotspot/src/os/linux/vm/perfMemory_linux.cpp
ccheung
parents:
6882
diff
changeset
|
1130 |
| 0 | 1131 mapAddress = (char*)::mmap((char*)0, size, mmap_prot, MAP_SHARED, fd, 0); |
| 1132 | |
|
10978
e95fc50106cf
7178026: os::close can restart ::close but that is not a restartable syscall
rdurbin
parents:
10969
diff
changeset
|
1133 result = ::close(fd); |
| 0 | 1134 assert(result != OS_ERR, "could not close file"); |
| 1135 | |
| 1136 if (mapAddress == MAP_FAILED) { | |
| 1137 if (PrintMiscellaneous && Verbose) { | |
| 1138 warning("mmap failed: %s\n", strerror(errno)); | |
| 1139 } | |
| 1140 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), | |
| 1141 "Could not map PerfMemory"); | |
| 1142 } | |
| 1143 | |
|
6882
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
zgu
parents:
6842
diff
changeset
|
1144 // it does not go through os api, the operation has to record from here |
|
10986
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10978
diff
changeset
|
1145 MemTracker::record_virtual_memory_reserve((address)mapAddress, size, mtInternal, CURRENT_PC); |
|
6882
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
zgu
parents:
6842
diff
changeset
|
1146 |
| 0 | 1147 *addr = mapAddress; |
| 1148 *sizep = size; | |
| 1149 | |
| 1150 if (PerfTraceMemOps) { | |
| 1151 tty->print("mapped " SIZE_FORMAT " bytes for vmid %d at " | |
|
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17765
diff
changeset
|
1152 INTPTR_FORMAT "\n", size, vmid, p2i((void*)mapAddress)); |
| 0 | 1153 } |
| 1154 } | |
| 1155 | |
| 1156 | |
| 1157 | |
| 1158 | |
| 1159 // create the PerfData memory region | |
| 1160 // | |
| 1161 // This method creates the memory region used to store performance | |
| 1162 // data for the JVM. The memory may be created in standard or | |
| 1163 // shared memory. | |
| 1164 // | |
| 1165 void PerfMemory::create_memory_region(size_t size) { | |
| 1166 | |
| 1167 if (PerfDisableSharedMem) { | |
| 1168 // do not share the memory for the performance data. | |
| 1169 _start = create_standard_memory(size); | |
| 1170 } | |
| 1171 else { | |
| 1172 _start = create_shared_memory(size); | |
| 1173 if (_start == NULL) { | |
| 1174 | |
| 1175 // creation of the shared memory region failed, attempt | |
| 1176 // to create a contiguous, non-shared memory region instead. | |
| 1177 // | |
| 1178 if (PrintMiscellaneous && Verbose) { | |
| 1179 warning("Reverting to non-shared PerfMemory region.\n"); | |
| 1180 } | |
| 1181 PerfDisableSharedMem = true; | |
| 1182 _start = create_standard_memory(size); | |
| 1183 } | |
| 1184 } | |
| 1185 | |
| 1186 if (_start != NULL) _capacity = size; | |
| 1187 | |
| 1188 } | |
| 1189 | |
| 1190 // delete the PerfData memory region | |
| 1191 // | |
| 1192 // This method deletes the memory region used to store performance | |
| 1193 // data for the JVM. The memory region indicated by the <address, size> | |
| 1194 // tuple will be inaccessible after a call to this method. | |
| 1195 // | |
| 1196 void PerfMemory::delete_memory_region() { | |
| 1197 | |
| 1198 assert((start() != NULL && capacity() > 0), "verify proper state"); | |
| 1199 | |
| 1200 // If user specifies PerfDataSaveFile, it will save the performance data | |
| 1201 // to the specified file name no matter whether PerfDataSaveToFile is specified | |
| 1202 // or not. In other word, -XX:PerfDataSaveFile=.. overrides flag | |
| 1203 // -XX:+PerfDataSaveToFile. | |
| 1204 if (PerfDataSaveToFile || PerfDataSaveFile != NULL) { | |
| 1205 save_memory_to_file(start(), capacity()); | |
| 1206 } | |
| 1207 | |
| 1208 if (PerfDisableSharedMem) { | |
| 1209 delete_standard_memory(start(), capacity()); | |
| 1210 } | |
| 1211 else { | |
| 1212 delete_shared_memory(start(), capacity()); | |
| 1213 } | |
| 1214 } | |
| 1215 | |
| 1216 // attach to the PerfData memory region for another JVM | |
| 1217 // | |
| 1218 // This method returns an <address, size> tuple that points to | |
| 1219 // a memory buffer that is kept reasonably synchronized with | |
| 1220 // the PerfData memory region for the indicated JVM. This | |
| 1221 // buffer may be kept in synchronization via shared memory | |
| 1222 // or some other mechanism that keeps the buffer updated. | |
| 1223 // | |
| 1224 // If the JVM chooses not to support the attachability feature, | |
| 1225 // this method should throw an UnsupportedOperation exception. | |
| 1226 // | |
| 1227 // This implementation utilizes named shared memory to map | |
| 1228 // the indicated process's PerfData memory region into this JVMs | |
| 1229 // address space. | |
| 1230 // | |
| 1231 void PerfMemory::attach(const char* user, int vmid, PerfMemoryMode mode, char** addrp, size_t* sizep, TRAPS) { | |
| 1232 | |
| 1233 if (vmid == 0 || vmid == os::current_process_id()) { | |
| 1234 *addrp = start(); | |
| 1235 *sizep = capacity(); | |
| 1236 return; | |
| 1237 } | |
| 1238 | |
| 1239 mmap_attach_shared(user, vmid, mode, addrp, sizep, CHECK); | |
| 1240 } | |
| 1241 | |
| 1242 // detach from the PerfData memory region of another JVM | |
| 1243 // | |
| 1244 // This method detaches the PerfData memory region of another | |
| 1245 // JVM, specified as an <address, size> tuple of a buffer | |
| 1246 // in this process's address space. This method may perform | |
| 1247 // arbitrary actions to accomplish the detachment. The memory | |
| 1248 // region specified by <address, size> will be inaccessible after | |
| 1249 // a call to this method. | |
| 1250 // | |
| 1251 // If the JVM chooses not to support the attachability feature, | |
| 1252 // this method should throw an UnsupportedOperation exception. | |
| 1253 // | |
| 1254 // This implementation utilizes named shared memory to detach | |
| 1255 // the indicated process's PerfData memory region from this | |
| 1256 // process's address space. | |
| 1257 // | |
| 1258 void PerfMemory::detach(char* addr, size_t bytes, TRAPS) { | |
| 1259 | |
| 1260 assert(addr != 0, "address sanity check"); | |
| 1261 assert(bytes > 0, "capacity sanity check"); | |
| 1262 | |
| 1263 if (PerfMemory::contains(addr) || PerfMemory::contains(addr + bytes - 1)) { | |
| 1264 // prevent accidental detachment of this process's PerfMemory region | |
| 1265 return; | |
| 1266 } | |
| 1267 | |
| 1268 unmap_shared(addr, bytes); | |
| 1269 } | |
| 1270 | |
| 1271 char* PerfMemory::backing_store_filename() { | |
| 1272 return backing_store_file_name; | |
| 1273 } |