Mercurial > hg > graal-jvmci-8
annotate src/os/linux/vm/perfMemory_linux.cpp @ 24096:63d6fa35faad
Merge
author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
---|---|
date | Tue, 07 Feb 2017 18:22:03 +0100 |
parents | b5f3a471e646 |
children |
rev | line source |
---|---|
0 | 1 /* |
23455
9f8038f83a6e
8130910: hsperfdata file is created in wrong directory and not cleaned up if /tmp/hsperfdata_<username> has wrong permissions
clanger
parents:
23416
diff
changeset
|
2 * Copyright (c) 2001, 2015, 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 | |
20779
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
200 // Check if the given statbuf is considered a secure directory for |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
201 // the backing store files. Returns true if the directory is considered |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
202 // a secure location. Returns false if the statbuf is a symbolic link or |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
203 // if an error occurred. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
204 // |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
205 static bool is_statbuf_secure(struct stat *statp) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
206 if (S_ISLNK(statp->st_mode) || !S_ISDIR(statp->st_mode)) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
207 // The path represents a link or some non-directory file type, |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
208 // which is not what we expected. Declare it insecure. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
209 // |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
210 return false; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
211 } |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
212 // We have an existing directory, check if the permissions are safe. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
213 // |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
214 if ((statp->st_mode & (S_IWGRP|S_IWOTH)) != 0) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
215 // The directory is open for writing and could be subjected |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
216 // to a symlink or a hard link attack. Declare it insecure. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
217 // |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
218 return false; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
219 } |
23416
decf7079a7b9
8075773: jps running as root fails after the fix of JDK-8050807
kevinw
parents:
21824
diff
changeset
|
220 // If user is not root then see if the uid of the directory matches the effective uid of the process. |
decf7079a7b9
8075773: jps running as root fails after the fix of JDK-8050807
kevinw
parents:
21824
diff
changeset
|
221 uid_t euid = geteuid(); |
decf7079a7b9
8075773: jps running as root fails after the fix of JDK-8050807
kevinw
parents:
21824
diff
changeset
|
222 if ((euid != 0) && (statp->st_uid != euid)) { |
20779
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
223 // The directory was not created by this user, declare it insecure. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
224 // |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
225 return false; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
226 } |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
227 return true; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
228 } |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
229 |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
230 |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
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 | |
20779
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
245 // The path exists, see if it is secure. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
246 return is_statbuf_secure(&statbuf); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
247 } |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
248 |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
249 |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
250 // Check if the given directory file descriptor is considered a secure |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
251 // directory for the backing store files. Returns true if the directory |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
252 // exists and is considered a secure location. Returns false if the path |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
253 // is a symbolic link or if an error occurred. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
254 // |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
255 static bool is_dirfd_secure(int dir_fd) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
256 struct stat statbuf; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
257 int result = 0; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
258 |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
259 RESTARTABLE(::fstat(dir_fd, &statbuf), result); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
260 if (result == OS_ERR) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
261 return false; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
262 } |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
263 |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
264 // The path exists, now check its mode. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
265 return is_statbuf_secure(&statbuf); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
266 } |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
267 |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
268 |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
269 // Check to make sure fd1 and fd2 are referencing the same file system object. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
270 // |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
271 static bool is_same_fsobject(int fd1, int fd2) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
272 struct stat statbuf1; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
273 struct stat statbuf2; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
274 int result = 0; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
275 |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
276 RESTARTABLE(::fstat(fd1, &statbuf1), result); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
277 if (result == OS_ERR) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
278 return false; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
279 } |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
280 RESTARTABLE(::fstat(fd2, &statbuf2), result); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
281 if (result == OS_ERR) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
282 return false; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
283 } |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
284 |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
285 if ((statbuf1.st_ino == statbuf2.st_ino) && |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
286 (statbuf1.st_dev == statbuf2.st_dev)) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
287 return true; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
288 } else { |
0 | 289 return false; |
290 } | |
20779
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
291 } |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
292 |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
293 |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
294 // Open the directory of the given path and validate it. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
295 // Return a DIR * of the open directory. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
296 // |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
297 static DIR *open_directory_secure(const char* dirname) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
298 // Open the directory using open() so that it can be verified |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
299 // to be secure by calling is_dirfd_secure(), opendir() and then check |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
300 // to see if they are the same file system object. This method does not |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
301 // introduce a window of opportunity for the directory to be attacked that |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
302 // calling opendir() and is_directory_secure() does. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
303 int result; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
304 DIR *dirp = NULL; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
305 RESTARTABLE(::open(dirname, O_RDONLY|O_NOFOLLOW), result); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
306 if (result == OS_ERR) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
307 if (PrintMiscellaneous && Verbose) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
308 if (errno == ELOOP) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
309 warning("directory %s is a symlink and is not secure\n", dirname); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
310 } else { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
311 warning("could not open directory %s: %s\n", dirname, strerror(errno)); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
312 } |
0 | 313 } |
20779
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
314 return dirp; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
315 } |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
316 int fd = result; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
317 |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
318 // Determine if the open directory is secure. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
319 if (!is_dirfd_secure(fd)) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
320 // The directory is not a secure directory. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
321 os::close(fd); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
322 return dirp; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
323 } |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
324 |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
325 // Open the directory. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
326 dirp = ::opendir(dirname); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
327 if (dirp == NULL) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
328 // The directory doesn't exist, close fd and return. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
329 os::close(fd); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
330 return dirp; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
331 } |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
332 |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
333 // Check to make sure fd and dirp are referencing the same file system object. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
334 if (!is_same_fsobject(fd, dirfd(dirp))) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
335 // The directory is not secure. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
336 os::close(fd); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
337 os::closedir(dirp); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
338 dirp = NULL; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
339 return dirp; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
340 } |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
341 |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
342 // Close initial open now that we know directory is secure |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
343 os::close(fd); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
344 |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
345 return dirp; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
346 } |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
347 |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
348 // NOTE: The code below uses fchdir(), open() and unlink() because |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
349 // fdopendir(), openat() and unlinkat() are not supported on all |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
350 // versions. Once the support for fdopendir(), openat() and unlinkat() |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
351 // is available on all supported versions the code can be changed |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
352 // to use these functions. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
353 |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
354 // Open the directory of the given path, validate it and set the |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
355 // current working directory to it. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
356 // Return a DIR * of the open directory and the saved cwd fd. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
357 // |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
358 static DIR *open_directory_secure_cwd(const char* dirname, int *saved_cwd_fd) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
359 |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
360 // Open the directory. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
361 DIR* dirp = open_directory_secure(dirname); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
362 if (dirp == NULL) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
363 // Directory doesn't exist or is insecure, so there is nothing to cleanup. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
364 return dirp; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
365 } |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
366 int fd = dirfd(dirp); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
367 |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
368 // Open a fd to the cwd and save it off. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
369 int result; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
370 RESTARTABLE(::open(".", O_RDONLY), result); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
371 if (result == OS_ERR) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
372 *saved_cwd_fd = -1; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
373 } else { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
374 *saved_cwd_fd = result; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
375 } |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
376 |
23455
9f8038f83a6e
8130910: hsperfdata file is created in wrong directory and not cleaned up if /tmp/hsperfdata_<username> has wrong permissions
clanger
parents:
23416
diff
changeset
|
377 // Set the current directory to dirname by using the fd of the directory and |
9f8038f83a6e
8130910: hsperfdata file is created in wrong directory and not cleaned up if /tmp/hsperfdata_<username> has wrong permissions
clanger
parents:
23416
diff
changeset
|
378 // handle errors, otherwise shared memory files will be created in cwd. |
20779
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
379 result = fchdir(fd); |
23455
9f8038f83a6e
8130910: hsperfdata file is created in wrong directory and not cleaned up if /tmp/hsperfdata_<username> has wrong permissions
clanger
parents:
23416
diff
changeset
|
380 if (result == OS_ERR) { |
9f8038f83a6e
8130910: hsperfdata file is created in wrong directory and not cleaned up if /tmp/hsperfdata_<username> has wrong permissions
clanger
parents:
23416
diff
changeset
|
381 if (PrintMiscellaneous && Verbose) { |
9f8038f83a6e
8130910: hsperfdata file is created in wrong directory and not cleaned up if /tmp/hsperfdata_<username> has wrong permissions
clanger
parents:
23416
diff
changeset
|
382 warning("could not change to directory %s", dirname); |
9f8038f83a6e
8130910: hsperfdata file is created in wrong directory and not cleaned up if /tmp/hsperfdata_<username> has wrong permissions
clanger
parents:
23416
diff
changeset
|
383 } |
9f8038f83a6e
8130910: hsperfdata file is created in wrong directory and not cleaned up if /tmp/hsperfdata_<username> has wrong permissions
clanger
parents:
23416
diff
changeset
|
384 if (*saved_cwd_fd != -1) { |
9f8038f83a6e
8130910: hsperfdata file is created in wrong directory and not cleaned up if /tmp/hsperfdata_<username> has wrong permissions
clanger
parents:
23416
diff
changeset
|
385 ::close(*saved_cwd_fd); |
9f8038f83a6e
8130910: hsperfdata file is created in wrong directory and not cleaned up if /tmp/hsperfdata_<username> has wrong permissions
clanger
parents:
23416
diff
changeset
|
386 *saved_cwd_fd = -1; |
9f8038f83a6e
8130910: hsperfdata file is created in wrong directory and not cleaned up if /tmp/hsperfdata_<username> has wrong permissions
clanger
parents:
23416
diff
changeset
|
387 } |
9f8038f83a6e
8130910: hsperfdata file is created in wrong directory and not cleaned up if /tmp/hsperfdata_<username> has wrong permissions
clanger
parents:
23416
diff
changeset
|
388 // Close the directory. |
9f8038f83a6e
8130910: hsperfdata file is created in wrong directory and not cleaned up if /tmp/hsperfdata_<username> has wrong permissions
clanger
parents:
23416
diff
changeset
|
389 os::closedir(dirp); |
9f8038f83a6e
8130910: hsperfdata file is created in wrong directory and not cleaned up if /tmp/hsperfdata_<username> has wrong permissions
clanger
parents:
23416
diff
changeset
|
390 return NULL; |
9f8038f83a6e
8130910: hsperfdata file is created in wrong directory and not cleaned up if /tmp/hsperfdata_<username> has wrong permissions
clanger
parents:
23416
diff
changeset
|
391 } else { |
9f8038f83a6e
8130910: hsperfdata file is created in wrong directory and not cleaned up if /tmp/hsperfdata_<username> has wrong permissions
clanger
parents:
23416
diff
changeset
|
392 return dirp; |
9f8038f83a6e
8130910: hsperfdata file is created in wrong directory and not cleaned up if /tmp/hsperfdata_<username> has wrong permissions
clanger
parents:
23416
diff
changeset
|
393 } |
20779
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
394 } |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
395 |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
396 // Close the directory and restore the current working directory. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
397 // |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
398 static void close_directory_secure_cwd(DIR* dirp, int saved_cwd_fd) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
399 |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
400 int result; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
401 // If we have a saved cwd change back to it and close the fd. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
402 if (saved_cwd_fd != -1) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
403 result = fchdir(saved_cwd_fd); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
404 ::close(saved_cwd_fd); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
405 } |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
406 |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
407 // Close the directory. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
408 os::closedir(dirp); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
409 } |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
410 |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
411 // Check if the given file descriptor is considered a secure. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
412 // |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
413 static bool is_file_secure(int fd, const char *filename) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
414 |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
415 int result; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
416 struct stat statbuf; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
417 |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
418 // Determine if the file is secure. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
419 RESTARTABLE(::fstat(fd, &statbuf), result); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
420 if (result == OS_ERR) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
421 if (PrintMiscellaneous && Verbose) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
422 warning("fstat failed on %s: %s\n", filename, strerror(errno)); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
423 } |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
424 return false; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
425 } |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
426 if (statbuf.st_nlink > 1) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
427 // A file with multiple links is not expected. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
428 if (PrintMiscellaneous && Verbose) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
429 warning("file %s has multiple links\n", filename); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
430 } |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
431 return false; |
0 | 432 } |
433 return true; | |
434 } | |
435 | |
436 | |
437 // return the user name for the given user id | |
438 // | |
439 // the caller is expected to free the allocated memory. | |
440 // | |
441 static char* get_user_name(uid_t uid) { | |
442 | |
443 struct passwd pwent; | |
444 | |
445 // determine the max pwbuf size from sysconf, and hardcode | |
446 // a default if this not available through sysconf. | |
447 // | |
448 long bufsize = sysconf(_SC_GETPW_R_SIZE_MAX); | |
449 if (bufsize == -1) | |
450 bufsize = 1024; | |
451 | |
6197 | 452 char* pwbuf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); |
0 | 453 |
454 // POSIX interface to getpwuid_r is used on LINUX | |
455 struct passwd* p; | |
456 int result = getpwuid_r(uid, &pwent, pwbuf, (size_t)bufsize, &p); | |
457 | |
458 if (result != 0 || p == NULL || p->pw_name == NULL || *(p->pw_name) == '\0') { | |
459 if (PrintMiscellaneous && Verbose) { | |
460 if (result != 0) { | |
461 warning("Could not retrieve passwd entry: %s\n", | |
462 strerror(result)); | |
463 } | |
464 else if (p == NULL) { | |
465 // this check is added to protect against an observed problem | |
466 // with getpwuid_r() on RedHat 9 where getpwuid_r returns 0, | |
467 // indicating success, but has p == NULL. This was observed when | |
468 // inserting a file descriptor exhaustion fault prior to the call | |
469 // getpwuid_r() call. In this case, error is set to the appropriate | |
470 // error condition, but this is undocumented behavior. This check | |
471 // is safe under any condition, but the use of errno in the output | |
472 // message may result in an erroneous message. | |
473 // Bug Id 89052 was opened with RedHat. | |
474 // | |
475 warning("Could not retrieve passwd entry: %s\n", | |
476 strerror(errno)); | |
477 } | |
478 else { | |
479 warning("Could not determine user name: %s\n", | |
480 p->pw_name == NULL ? "pw_name = NULL" : | |
481 "pw_name zero length"); | |
482 } | |
483 } | |
6197 | 484 FREE_C_HEAP_ARRAY(char, pwbuf, mtInternal); |
0 | 485 return NULL; |
486 } | |
487 | |
6197 | 488 char* user_name = NEW_C_HEAP_ARRAY(char, strlen(p->pw_name) + 1, mtInternal); |
0 | 489 strcpy(user_name, p->pw_name); |
490 | |
6197 | 491 FREE_C_HEAP_ARRAY(char, pwbuf, mtInternal); |
0 | 492 return user_name; |
493 } | |
494 | |
495 // return the name of the user that owns the process identified by vmid. | |
496 // | |
497 // This method uses a slow directory search algorithm to find the backing | |
498 // store file for the specified vmid and returns the user name, as determined | |
499 // by the user name suffix of the hsperfdata_<username> directory name. | |
500 // | |
501 // the caller is expected to free the allocated memory. | |
502 // | |
503 static char* get_user_name_slow(int vmid, TRAPS) { | |
504 | |
505 // short circuit the directory search if the process doesn't even exist. | |
506 if (kill(vmid, 0) == OS_ERR) { | |
507 if (errno == ESRCH) { | |
508 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), | |
509 "Process not found"); | |
510 } | |
511 else /* EPERM */ { | |
512 THROW_MSG_0(vmSymbols::java_io_IOException(), strerror(errno)); | |
513 } | |
514 } | |
515 | |
516 // directory search | |
517 char* oldest_user = NULL; | |
518 time_t oldest_ctime = 0; | |
519 | |
520 const char* tmpdirname = os::get_temp_directory(); | |
521 | |
20779
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
522 // open the temp directory |
0 | 523 DIR* tmpdirp = os::opendir(tmpdirname); |
524 | |
525 if (tmpdirp == NULL) { | |
20779
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
526 // Cannot open the directory to get the user name, return. |
0 | 527 return NULL; |
528 } | |
529 | |
530 // for each entry in the directory that matches the pattern hsperfdata_*, | |
531 // open the directory and check if the file for the given vmid exists. | |
532 // The file with the expected name and the latest creation date is used | |
533 // to determine the user name for the process id. | |
534 // | |
535 struct dirent* dentry; | |
6197 | 536 char* tdbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(tmpdirname), mtInternal); |
0 | 537 errno = 0; |
538 while ((dentry = os::readdir(tmpdirp, (struct dirent *)tdbuf)) != NULL) { | |
539 | |
540 // check if the directory entry is a hsperfdata file | |
541 if (strncmp(dentry->d_name, PERFDATA_NAME, strlen(PERFDATA_NAME)) != 0) { | |
542 continue; | |
543 } | |
544 | |
545 char* usrdir_name = NEW_C_HEAP_ARRAY(char, | |
6197 | 546 strlen(tmpdirname) + strlen(dentry->d_name) + 2, mtInternal); |
0 | 547 strcpy(usrdir_name, tmpdirname); |
1353
a2ea687fdc7c
6938627: Make temporary directory use property java.io.tmpdir when specified
coleenp
parents:
605
diff
changeset
|
548 strcat(usrdir_name, "/"); |
0 | 549 strcat(usrdir_name, dentry->d_name); |
550 | |
20779
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
551 // open the user directory |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
552 DIR* subdirp = open_directory_secure(usrdir_name); |
0 | 553 |
554 if (subdirp == NULL) { | |
6197 | 555 FREE_C_HEAP_ARRAY(char, usrdir_name, mtInternal); |
0 | 556 continue; |
557 } | |
558 | |
559 // Since we don't create the backing store files in directories | |
560 // pointed to by symbolic links, we also don't follow them when | |
561 // looking for the files. We check for a symbolic link after the | |
562 // call to opendir in order to eliminate a small window where the | |
563 // symlink can be exploited. | |
564 // | |
565 if (!is_directory_secure(usrdir_name)) { | |
6197 | 566 FREE_C_HEAP_ARRAY(char, usrdir_name, mtInternal); |
0 | 567 os::closedir(subdirp); |
568 continue; | |
569 } | |
570 | |
571 struct dirent* udentry; | |
6197 | 572 char* udbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(usrdir_name), mtInternal); |
0 | 573 errno = 0; |
574 while ((udentry = os::readdir(subdirp, (struct dirent *)udbuf)) != NULL) { | |
575 | |
576 if (filename_to_pid(udentry->d_name) == vmid) { | |
577 struct stat statbuf; | |
578 int result; | |
579 | |
580 char* filename = NEW_C_HEAP_ARRAY(char, | |
6197 | 581 strlen(usrdir_name) + strlen(udentry->d_name) + 2, mtInternal); |
0 | 582 |
583 strcpy(filename, usrdir_name); | |
584 strcat(filename, "/"); | |
585 strcat(filename, udentry->d_name); | |
586 | |
587 // don't follow symbolic links for the file | |
588 RESTARTABLE(::lstat(filename, &statbuf), result); | |
589 if (result == OS_ERR) { | |
6197 | 590 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
0 | 591 continue; |
592 } | |
593 | |
594 // skip over files that are not regular files. | |
595 if (!S_ISREG(statbuf.st_mode)) { | |
6197 | 596 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
0 | 597 continue; |
598 } | |
599 | |
600 // compare and save filename with latest creation time | |
601 if (statbuf.st_size > 0 && statbuf.st_ctime > oldest_ctime) { | |
602 | |
603 if (statbuf.st_ctime > oldest_ctime) { | |
604 char* user = strchr(dentry->d_name, '_') + 1; | |
605 | |
6197 | 606 if (oldest_user != NULL) FREE_C_HEAP_ARRAY(char, oldest_user, mtInternal); |
607 oldest_user = NEW_C_HEAP_ARRAY(char, strlen(user)+1, mtInternal); | |
0 | 608 |
609 strcpy(oldest_user, user); | |
610 oldest_ctime = statbuf.st_ctime; | |
611 } | |
612 } | |
613 | |
6197 | 614 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
0 | 615 } |
616 } | |
617 os::closedir(subdirp); | |
6197 | 618 FREE_C_HEAP_ARRAY(char, udbuf, mtInternal); |
619 FREE_C_HEAP_ARRAY(char, usrdir_name, mtInternal); | |
0 | 620 } |
621 os::closedir(tmpdirp); | |
6197 | 622 FREE_C_HEAP_ARRAY(char, tdbuf, mtInternal); |
0 | 623 |
624 return(oldest_user); | |
625 } | |
626 | |
627 // return the name of the user that owns the JVM indicated by the given vmid. | |
628 // | |
629 static char* get_user_name(int vmid, TRAPS) { | |
630 return get_user_name_slow(vmid, CHECK_NULL); | |
631 } | |
632 | |
633 // return the file name of the backing store file for the named | |
634 // shared memory region for the given user name and vmid. | |
635 // | |
636 // the caller is expected to free the allocated memory. | |
637 // | |
638 static char* get_sharedmem_filename(const char* dirname, int vmid) { | |
639 | |
640 // add 2 for the file separator and a null terminator. | |
641 size_t nbytes = strlen(dirname) + UINT_CHARS + 2; | |
642 | |
6197 | 643 char* name = NEW_C_HEAP_ARRAY(char, nbytes, mtInternal); |
0 | 644 snprintf(name, nbytes, "%s/%d", dirname, vmid); |
645 | |
646 return name; | |
647 } | |
648 | |
649 | |
650 // remove file | |
651 // | |
652 // this method removes the file specified by the given path | |
653 // | |
654 static void remove_file(const char* path) { | |
655 | |
656 int result; | |
657 | |
658 // if the file is a directory, the following unlink will fail. since | |
659 // we don't expect to find directories in the user temp directory, we | |
660 // won't try to handle this situation. even if accidentially or | |
661 // maliciously planted, the directory's presence won't hurt anything. | |
662 // | |
663 RESTARTABLE(::unlink(path), result); | |
664 if (PrintMiscellaneous && Verbose && result == OS_ERR) { | |
665 if (errno != ENOENT) { | |
666 warning("Could not unlink shared memory backing" | |
667 " store file %s : %s\n", path, strerror(errno)); | |
668 } | |
669 } | |
670 } | |
671 | |
672 | |
673 // cleanup stale shared memory resources | |
674 // | |
675 // This method attempts to remove all stale shared memory files in | |
676 // the named user temporary directory. It scans the named directory | |
677 // for files matching the pattern ^$[0-9]*$. For each file found, the | |
678 // process id is extracted from the file name and a test is run to | |
679 // determine if the process is alive. If the process is not alive, | |
680 // any stale file resources are removed. | |
681 // | |
682 static void cleanup_sharedmem_resources(const char* dirname) { | |
683 | |
20779
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
684 int saved_cwd_fd; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
685 // open the directory |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
686 DIR* dirp = open_directory_secure_cwd(dirname, &saved_cwd_fd); |
0 | 687 if (dirp == NULL) { |
20779
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
688 // directory doesn't exist or is insecure, so there is nothing to cleanup |
0 | 689 return; |
690 } | |
691 | |
692 // for each entry in the directory that matches the expected file | |
693 // name pattern, determine if the file resources are stale and if | |
694 // so, remove the file resources. Note, instrumented HotSpot processes | |
695 // for this user may start and/or terminate during this search and | |
696 // remove or create new files in this directory. The behavior of this | |
697 // loop under these conditions is dependent upon the implementation of | |
698 // opendir/readdir. | |
699 // | |
700 struct dirent* entry; | |
6197 | 701 char* dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(dirname), mtInternal); |
20779
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
702 |
0 | 703 errno = 0; |
704 while ((entry = os::readdir(dirp, (struct dirent *)dbuf)) != NULL) { | |
705 | |
706 pid_t pid = filename_to_pid(entry->d_name); | |
707 | |
708 if (pid == 0) { | |
709 | |
710 if (strcmp(entry->d_name, ".") != 0 && strcmp(entry->d_name, "..") != 0) { | |
711 // attempt to remove all unexpected files, except "." and ".." | |
20779
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
712 unlink(entry->d_name); |
0 | 713 } |
714 | |
715 errno = 0; | |
716 continue; | |
717 } | |
718 | |
719 // we now have a file name that converts to a valid integer | |
720 // that could represent a process id . if this process id | |
721 // matches the current process id or the process is not running, | |
722 // then remove the stale file resources. | |
723 // | |
724 // process liveness is detected by sending signal number 0 to | |
725 // the process id (see kill(2)). if kill determines that the | |
726 // process does not exist, then the file resources are removed. | |
727 // if kill determines that that we don't have permission to | |
728 // signal the process, then the file resources are assumed to | |
729 // be stale and are removed because the resources for such a | |
730 // process should be in a different user specific directory. | |
731 // | |
732 if ((pid == os::current_process_id()) || | |
733 (kill(pid, 0) == OS_ERR && (errno == ESRCH || errno == EPERM))) { | |
20779
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
734 unlink(entry->d_name); |
0 | 735 } |
736 errno = 0; | |
737 } | |
20779
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
738 |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
739 // close the directory and reset the current working directory |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
740 close_directory_secure_cwd(dirp, saved_cwd_fd); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
741 |
6197 | 742 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); |
0 | 743 } |
744 | |
745 // make the user specific temporary directory. Returns true if | |
746 // the directory exists and is secure upon return. Returns false | |
747 // if the directory exists but is either a symlink, is otherwise | |
748 // insecure, or if an error occurred. | |
749 // | |
750 static bool make_user_tmp_dir(const char* dirname) { | |
751 | |
752 // create the directory with 0755 permissions. note that the directory | |
753 // will be owned by euid::egid, which may not be the same as uid::gid. | |
754 // | |
755 if (mkdir(dirname, S_IRWXU|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH) == OS_ERR) { | |
756 if (errno == EEXIST) { | |
757 // The directory already exists and was probably created by another | |
758 // JVM instance. However, this could also be the result of a | |
759 // deliberate symlink. Verify that the existing directory is safe. | |
760 // | |
761 if (!is_directory_secure(dirname)) { | |
762 // directory is not secure | |
763 if (PrintMiscellaneous && Verbose) { | |
764 warning("%s directory is insecure\n", dirname); | |
765 } | |
766 return false; | |
767 } | |
768 } | |
769 else { | |
770 // we encountered some other failure while attempting | |
771 // to create the directory | |
772 // | |
773 if (PrintMiscellaneous && Verbose) { | |
774 warning("could not create directory %s: %s\n", | |
775 dirname, strerror(errno)); | |
776 } | |
777 return false; | |
778 } | |
779 } | |
780 return true; | |
781 } | |
782 | |
783 // create the shared memory file resources | |
784 // | |
785 // This method creates the shared memory file with the given size | |
786 // This method also creates the user specific temporary directory, if | |
787 // it does not yet exist. | |
788 // | |
789 static int create_sharedmem_resources(const char* dirname, const char* filename, size_t size) { | |
790 | |
791 // make the user temporary directory | |
792 if (!make_user_tmp_dir(dirname)) { | |
793 // could not make/find the directory or the found directory | |
794 // was not secure | |
795 return -1; | |
796 } | |
797 | |
20779
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
798 int saved_cwd_fd; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
799 // open the directory and set the current working directory to it |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
800 DIR* dirp = open_directory_secure_cwd(dirname, &saved_cwd_fd); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
801 if (dirp == NULL) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
802 // Directory doesn't exist or is insecure, so cannot create shared |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
803 // memory file. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
804 return -1; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
805 } |
0 | 806 |
20779
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
807 // Open the filename in the current directory. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
808 // Cannot use O_TRUNC here; truncation of an existing file has to happen |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
809 // after the is_file_secure() check below. |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
810 int result; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
811 RESTARTABLE(::open(filename, O_RDWR|O_CREAT|O_NOFOLLOW, S_IREAD|S_IWRITE), result); |
0 | 812 if (result == OS_ERR) { |
813 if (PrintMiscellaneous && Verbose) { | |
20779
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
814 if (errno == ELOOP) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
815 warning("file %s is a symlink and is not secure\n", filename); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
816 } else { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
817 warning("could not create file %s: %s\n", filename, strerror(errno)); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
818 } |
0 | 819 } |
20779
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
820 // close the directory and reset the current working directory |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
821 close_directory_secure_cwd(dirp, saved_cwd_fd); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
822 |
0 | 823 return -1; |
824 } | |
20779
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
825 // close the directory and reset the current working directory |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
826 close_directory_secure_cwd(dirp, saved_cwd_fd); |
0 | 827 |
828 // save the file descriptor | |
829 int fd = result; | |
830 | |
20779
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
831 // check to see if the file is secure |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
832 if (!is_file_secure(fd, filename)) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
833 ::close(fd); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
834 return -1; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
835 } |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
836 |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
837 // truncate the file to get rid of any existing data |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
838 RESTARTABLE(::ftruncate(fd, (off_t)0), result); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
839 if (result == OS_ERR) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
840 if (PrintMiscellaneous && Verbose) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
841 warning("could not truncate shared memory file: %s\n", strerror(errno)); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
842 } |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
843 ::close(fd); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
844 return -1; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
845 } |
0 | 846 // set the file size |
847 RESTARTABLE(::ftruncate(fd, (off_t)size), result); | |
848 if (result == OS_ERR) { | |
849 if (PrintMiscellaneous && Verbose) { | |
850 warning("could not set shared memory file size: %s\n", strerror(errno)); | |
851 } | |
10978
e95fc50106cf
7178026: os::close can restart ::close but that is not a restartable syscall
rdurbin
parents:
10969
diff
changeset
|
852 ::close(fd); |
0 | 853 return -1; |
854 } | |
855 | |
2066
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
856 // 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
|
857 // 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
|
858 // we don't. |
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 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
|
861 int zero_int = 0; |
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
862 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
|
863 if (result == -1 ) break; |
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
864 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
|
865 if (result != 1) { |
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
866 if (errno == ENOSPC) { |
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
867 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
|
868 } |
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
869 break; |
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
870 } |
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
871 } |
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
872 |
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
873 if (result != -1) { |
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
874 return fd; |
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
875 } else { |
10978
e95fc50106cf
7178026: os::close can restart ::close but that is not a restartable syscall
rdurbin
parents:
10969
diff
changeset
|
876 ::close(fd); |
2066
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
877 return -1; |
02895c6a2f82
7007769: VM crashes with SIGBUS writing PerfData if tmp space is full
bobv
parents:
1972
diff
changeset
|
878 } |
0 | 879 } |
880 | |
881 // open the shared memory file for the given user and vmid. returns | |
882 // the file descriptor for the open file or -1 if the file could not | |
883 // be opened. | |
884 // | |
885 static int open_sharedmem_file(const char* filename, int oflags, TRAPS) { | |
886 | |
887 // open the file | |
888 int result; | |
889 RESTARTABLE(::open(filename, oflags), result); | |
890 if (result == OS_ERR) { | |
891 if (errno == ENOENT) { | |
9064
4b7cf00ccb08
8006001: [parfait] Possible file leak in hotspot/src/os/linux/vm/perfMemory_linux.cpp
ccheung
parents:
6882
diff
changeset
|
892 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
|
893 "Process not found", OS_ERR); |
0 | 894 } |
895 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
|
896 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
|
897 "Permission denied", OS_ERR); |
0 | 898 } |
899 else { | |
9064
4b7cf00ccb08
8006001: [parfait] Possible file leak in hotspot/src/os/linux/vm/perfMemory_linux.cpp
ccheung
parents:
6882
diff
changeset
|
900 THROW_MSG_(vmSymbols::java_io_IOException(), strerror(errno), OS_ERR); |
0 | 901 } |
902 } | |
20779
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
903 int fd = result; |
0 | 904 |
20779
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
905 // check to see if the file is secure |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
906 if (!is_file_secure(fd, filename)) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
907 ::close(fd); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
908 return -1; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
909 } |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
910 |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
911 return fd; |
0 | 912 } |
913 | |
914 // create a named shared memory region. returns the address of the | |
915 // memory region on success or NULL on failure. A return value of | |
916 // NULL will ultimately disable the shared memory feature. | |
917 // | |
918 // On Solaris and Linux, the name space for shared memory objects | |
919 // is the file system name space. | |
920 // | |
921 // A monitoring application attaching to a JVM does not need to know | |
922 // the file system name of the shared memory object. However, it may | |
923 // be convenient for applications to discover the existence of newly | |
924 // created and terminating JVMs by watching the file system name space | |
925 // for files being created or removed. | |
926 // | |
927 static char* mmap_create_shared(size_t size) { | |
928 | |
929 int result; | |
930 int fd; | |
931 char* mapAddress; | |
932 | |
933 int vmid = os::current_process_id(); | |
934 | |
935 char* user_name = get_user_name(geteuid()); | |
936 | |
937 if (user_name == NULL) | |
938 return NULL; | |
939 | |
940 char* dirname = get_user_tmp_dir(user_name); | |
941 char* filename = get_sharedmem_filename(dirname, vmid); | |
20779
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
942 // get the short filename |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
943 char* short_filename = strrchr(filename, '/'); |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
944 if (short_filename == NULL) { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
945 short_filename = filename; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
946 } else { |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
947 short_filename++; |
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
948 } |
0 | 949 |
950 // cleanup any stale shared memory files | |
951 cleanup_sharedmem_resources(dirname); | |
952 | |
953 assert(((size > 0) && (size % os::vm_page_size() == 0)), | |
954 "unexpected PerfMemory region size"); | |
955 | |
20779
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
956 fd = create_sharedmem_resources(dirname, short_filename, size); |
0 | 957 |
6197 | 958 FREE_C_HEAP_ARRAY(char, user_name, mtInternal); |
959 FREE_C_HEAP_ARRAY(char, dirname, mtInternal); | |
0 | 960 |
961 if (fd == -1) { | |
6197 | 962 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
0 | 963 return NULL; |
964 } | |
965 | |
966 mapAddress = (char*)::mmap((char*)0, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0); | |
967 | |
10978
e95fc50106cf
7178026: os::close can restart ::close but that is not a restartable syscall
rdurbin
parents:
10969
diff
changeset
|
968 result = ::close(fd); |
0 | 969 assert(result != OS_ERR, "could not close file"); |
970 | |
971 if (mapAddress == MAP_FAILED) { | |
972 if (PrintMiscellaneous && Verbose) { | |
973 warning("mmap failed - %s\n", strerror(errno)); | |
974 } | |
975 remove_file(filename); | |
6197 | 976 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
0 | 977 return NULL; |
978 } | |
979 | |
980 // save the file name for use in delete_shared_memory() | |
981 backing_store_file_name = filename; | |
982 | |
983 // clear the shared memory region | |
984 (void)::memset((void*) mapAddress, 0, size); | |
985 | |
6882
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
zgu
parents:
6842
diff
changeset
|
986 // it does not go through os api, the operation has to record from here |
20360 | 987 MemTracker::record_virtual_memory_reserve_and_commit((address)mapAddress, size, CURRENT_PC, mtInternal); |
6882
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
zgu
parents:
6842
diff
changeset
|
988 |
0 | 989 return mapAddress; |
990 } | |
991 | |
992 // release a named shared memory region | |
993 // | |
994 static void unmap_shared(char* addr, size_t bytes) { | |
995 os::release_memory(addr, bytes); | |
996 } | |
997 | |
998 // create the PerfData memory region in shared memory. | |
999 // | |
1000 static char* create_shared_memory(size_t size) { | |
1001 | |
1002 // create the shared memory region. | |
1003 return mmap_create_shared(size); | |
1004 } | |
1005 | |
1006 // delete the shared PerfData memory region | |
1007 // | |
1008 static void delete_shared_memory(char* addr, size_t size) { | |
1009 | |
1010 // cleanup the persistent shared memory resources. since DestroyJavaVM does | |
1011 // not support unloading of the JVM, unmapping of the memory resource is | |
1012 // not performed. The memory will be reclaimed by the OS upon termination of | |
1013 // the process. The backing store file is deleted from the file system. | |
1014 | |
1015 assert(!PerfDisableSharedMem, "shouldn't be here"); | |
1016 | |
1017 if (backing_store_file_name != NULL) { | |
1018 remove_file(backing_store_file_name); | |
1019 // Don't.. Free heap memory could deadlock os::abort() if it is called | |
1020 // from signal handler. OS will reclaim the heap memory. | |
1021 // FREE_C_HEAP_ARRAY(char, backing_store_file_name); | |
1022 backing_store_file_name = NULL; | |
1023 } | |
1024 } | |
1025 | |
1026 // return the size of the file for the given file descriptor | |
1027 // or 0 if it is not a valid size for a shared memory file | |
1028 // | |
1029 static size_t sharedmem_filesize(int fd, TRAPS) { | |
1030 | |
1031 struct stat statbuf; | |
1032 int result; | |
1033 | |
1034 RESTARTABLE(::fstat(fd, &statbuf), result); | |
1035 if (result == OS_ERR) { | |
1036 if (PrintMiscellaneous && Verbose) { | |
1037 warning("fstat failed: %s\n", strerror(errno)); | |
1038 } | |
1039 THROW_MSG_0(vmSymbols::java_io_IOException(), | |
1040 "Could not determine PerfMemory size"); | |
1041 } | |
1042 | |
1043 if ((statbuf.st_size == 0) || | |
1044 ((size_t)statbuf.st_size % os::vm_page_size() != 0)) { | |
1045 THROW_MSG_0(vmSymbols::java_lang_Exception(), | |
1046 "Invalid PerfMemory size"); | |
1047 } | |
1048 | |
1049 return (size_t)statbuf.st_size; | |
1050 } | |
1051 | |
1052 // attach to a named shared memory region. | |
1053 // | |
1054 static void mmap_attach_shared(const char* user, int vmid, PerfMemory::PerfMemoryMode mode, char** addr, size_t* sizep, TRAPS) { | |
1055 | |
1056 char* mapAddress; | |
1057 int result; | |
1058 int fd; | |
9064
4b7cf00ccb08
8006001: [parfait] Possible file leak in hotspot/src/os/linux/vm/perfMemory_linux.cpp
ccheung
parents:
6882
diff
changeset
|
1059 size_t size = 0; |
0 | 1060 const char* luser = NULL; |
1061 | |
1062 int mmap_prot; | |
1063 int file_flags; | |
1064 | |
1065 ResourceMark rm; | |
1066 | |
1067 // map the high level access mode to the appropriate permission | |
1068 // constructs for the file and the shared memory mapping. | |
1069 if (mode == PerfMemory::PERF_MODE_RO) { | |
1070 mmap_prot = PROT_READ; | |
20779
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
1071 file_flags = O_RDONLY | O_NOFOLLOW; |
0 | 1072 } |
1073 else if (mode == PerfMemory::PERF_MODE_RW) { | |
1074 #ifdef LATER | |
1075 mmap_prot = PROT_READ | PROT_WRITE; | |
20779
d7b6bdd51abe
8050807: Better performing performance data handling
gthornbr
parents:
17937
diff
changeset
|
1076 file_flags = O_RDWR | O_NOFOLLOW; |
0 | 1077 #else |
1078 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), | |
1079 "Unsupported access mode"); | |
1080 #endif | |
1081 } | |
1082 else { | |
1083 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), | |
1084 "Illegal access mode"); | |
1085 } | |
1086 | |
1087 if (user == NULL || strlen(user) == 0) { | |
1088 luser = get_user_name(vmid, CHECK); | |
1089 } | |
1090 else { | |
1091 luser = user; | |
1092 } | |
1093 | |
1094 if (luser == NULL) { | |
1095 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), | |
1096 "Could not map vmid to user Name"); | |
1097 } | |
1098 | |
1099 char* dirname = get_user_tmp_dir(luser); | |
1100 | |
1101 // since we don't follow symbolic links when creating the backing | |
1102 // store file, we don't follow them when attaching either. | |
1103 // | |
1104 if (!is_directory_secure(dirname)) { | |
6197 | 1105 FREE_C_HEAP_ARRAY(char, dirname, mtInternal); |
0 | 1106 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), |
1107 "Process not found"); | |
1108 } | |
1109 | |
1110 char* filename = get_sharedmem_filename(dirname, vmid); | |
1111 | |
1112 // copy heap memory to resource memory. the open_sharedmem_file | |
1113 // method below need to use the filename, but could throw an | |
1114 // exception. using a resource array prevents the leak that | |
1115 // would otherwise occur. | |
1116 char* rfilename = NEW_RESOURCE_ARRAY(char, strlen(filename) + 1); | |
1117 strcpy(rfilename, filename); | |
1118 | |
1119 // free the c heap resources that are no longer needed | |
6197 | 1120 if (luser != user) FREE_C_HEAP_ARRAY(char, luser, mtInternal); |
1121 FREE_C_HEAP_ARRAY(char, dirname, mtInternal); | |
1122 FREE_C_HEAP_ARRAY(char, filename, mtInternal); | |
0 | 1123 |
1124 // open the shared memory file for the give vmid | |
14328 | 1125 fd = open_sharedmem_file(rfilename, file_flags, THREAD); |
1126 | |
1127 if (fd == OS_ERR) { | |
1128 return; | |
1129 } | |
1130 | |
1131 if (HAS_PENDING_EXCEPTION) { | |
1132 ::close(fd); | |
1133 return; | |
1134 } | |
0 | 1135 |
1136 if (*sizep == 0) { | |
1137 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
|
1138 } else { |
4b7cf00ccb08
8006001: [parfait] Possible file leak in hotspot/src/os/linux/vm/perfMemory_linux.cpp
ccheung
parents:
6882
diff
changeset
|
1139 size = *sizep; |
0 | 1140 } |
1141 | |
9064
4b7cf00ccb08
8006001: [parfait] Possible file leak in hotspot/src/os/linux/vm/perfMemory_linux.cpp
ccheung
parents:
6882
diff
changeset
|
1142 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
|
1143 |
0 | 1144 mapAddress = (char*)::mmap((char*)0, size, mmap_prot, MAP_SHARED, fd, 0); |
1145 | |
10978
e95fc50106cf
7178026: os::close can restart ::close but that is not a restartable syscall
rdurbin
parents:
10969
diff
changeset
|
1146 result = ::close(fd); |
0 | 1147 assert(result != OS_ERR, "could not close file"); |
1148 | |
1149 if (mapAddress == MAP_FAILED) { | |
1150 if (PrintMiscellaneous && Verbose) { | |
1151 warning("mmap failed: %s\n", strerror(errno)); | |
1152 } | |
1153 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), | |
1154 "Could not map PerfMemory"); | |
1155 } | |
1156 | |
6882
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
zgu
parents:
6842
diff
changeset
|
1157 // it does not go through os api, the operation has to record from here |
20360 | 1158 MemTracker::record_virtual_memory_reserve_and_commit((address)mapAddress, size, CURRENT_PC, mtInternal); |
6882
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
zgu
parents:
6842
diff
changeset
|
1159 |
0 | 1160 *addr = mapAddress; |
1161 *sizep = size; | |
1162 | |
1163 if (PerfTraceMemOps) { | |
1164 tty->print("mapped " SIZE_FORMAT " bytes for vmid %d at " | |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
14328
diff
changeset
|
1165 INTPTR_FORMAT "\n", size, vmid, p2i((void*)mapAddress)); |
0 | 1166 } |
1167 } | |
1168 | |
1169 | |
1170 | |
1171 | |
1172 // create the PerfData memory region | |
1173 // | |
1174 // This method creates the memory region used to store performance | |
1175 // data for the JVM. The memory may be created in standard or | |
1176 // shared memory. | |
1177 // | |
1178 void PerfMemory::create_memory_region(size_t size) { | |
1179 | |
1180 if (PerfDisableSharedMem) { | |
1181 // do not share the memory for the performance data. | |
1182 _start = create_standard_memory(size); | |
1183 } | |
1184 else { | |
1185 _start = create_shared_memory(size); | |
1186 if (_start == NULL) { | |
1187 | |
1188 // creation of the shared memory region failed, attempt | |
1189 // to create a contiguous, non-shared memory region instead. | |
1190 // | |
1191 if (PrintMiscellaneous && Verbose) { | |
1192 warning("Reverting to non-shared PerfMemory region.\n"); | |
1193 } | |
1194 PerfDisableSharedMem = true; | |
1195 _start = create_standard_memory(size); | |
1196 } | |
1197 } | |
1198 | |
1199 if (_start != NULL) _capacity = size; | |
1200 | |
1201 } | |
1202 | |
1203 // delete the PerfData memory region | |
1204 // | |
1205 // This method deletes the memory region used to store performance | |
1206 // data for the JVM. The memory region indicated by the <address, size> | |
1207 // tuple will be inaccessible after a call to this method. | |
1208 // | |
1209 void PerfMemory::delete_memory_region() { | |
1210 | |
1211 assert((start() != NULL && capacity() > 0), "verify proper state"); | |
1212 | |
1213 // If user specifies PerfDataSaveFile, it will save the performance data | |
1214 // to the specified file name no matter whether PerfDataSaveToFile is specified | |
1215 // or not. In other word, -XX:PerfDataSaveFile=.. overrides flag | |
1216 // -XX:+PerfDataSaveToFile. | |
1217 if (PerfDataSaveToFile || PerfDataSaveFile != NULL) { | |
1218 save_memory_to_file(start(), capacity()); | |
1219 } | |
1220 | |
1221 if (PerfDisableSharedMem) { | |
1222 delete_standard_memory(start(), capacity()); | |
1223 } | |
1224 else { | |
1225 delete_shared_memory(start(), capacity()); | |
1226 } | |
1227 } | |
1228 | |
1229 // attach to the PerfData memory region for another JVM | |
1230 // | |
1231 // This method returns an <address, size> tuple that points to | |
1232 // a memory buffer that is kept reasonably synchronized with | |
1233 // the PerfData memory region for the indicated JVM. This | |
1234 // buffer may be kept in synchronization via shared memory | |
1235 // or some other mechanism that keeps the buffer updated. | |
1236 // | |
1237 // If the JVM chooses not to support the attachability feature, | |
1238 // this method should throw an UnsupportedOperation exception. | |
1239 // | |
1240 // This implementation utilizes named shared memory to map | |
1241 // the indicated process's PerfData memory region into this JVMs | |
1242 // address space. | |
1243 // | |
1244 void PerfMemory::attach(const char* user, int vmid, PerfMemoryMode mode, char** addrp, size_t* sizep, TRAPS) { | |
1245 | |
1246 if (vmid == 0 || vmid == os::current_process_id()) { | |
1247 *addrp = start(); | |
1248 *sizep = capacity(); | |
1249 return; | |
1250 } | |
1251 | |
1252 mmap_attach_shared(user, vmid, mode, addrp, sizep, CHECK); | |
1253 } | |
1254 | |
1255 // detach from the PerfData memory region of another JVM | |
1256 // | |
1257 // This method detaches the PerfData memory region of another | |
1258 // JVM, specified as an <address, size> tuple of a buffer | |
1259 // in this process's address space. This method may perform | |
1260 // arbitrary actions to accomplish the detachment. The memory | |
1261 // region specified by <address, size> will be inaccessible after | |
1262 // a call to this method. | |
1263 // | |
1264 // If the JVM chooses not to support the attachability feature, | |
1265 // this method should throw an UnsupportedOperation exception. | |
1266 // | |
1267 // This implementation utilizes named shared memory to detach | |
1268 // the indicated process's PerfData memory region from this | |
1269 // process's address space. | |
1270 // | |
1271 void PerfMemory::detach(char* addr, size_t bytes, TRAPS) { | |
1272 | |
1273 assert(addr != 0, "address sanity check"); | |
1274 assert(bytes > 0, "capacity sanity check"); | |
1275 | |
1276 if (PerfMemory::contains(addr) || PerfMemory::contains(addr + bytes - 1)) { | |
1277 // prevent accidental detachment of this process's PerfMemory region | |
1278 return; | |
1279 } | |
1280 | |
1281 unmap_shared(addr, bytes); | |
1282 } | |
1283 | |
1284 char* PerfMemory::backing_store_filename() { | |
1285 return backing_store_file_name; | |
1286 } |