Mercurial > hg > graal-compiler
annotate src/os/linux/vm/perfMemory_linux.cpp @ 21714:fb9f7fe34624
Backed out changeset: 5db03b62b621
author | Andreas Woess <andreas.woess@oracle.com> |
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date | Thu, 04 Jun 2015 01:00:00 +0200 |
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0 | 1 /* |
14328 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/vmSymbols.hpp" | |
27 #include "memory/allocation.inline.hpp" | |
28 #include "memory/resourceArea.hpp" | |
29 #include "oops/oop.inline.hpp" | |
30 #include "os_linux.inline.hpp" | |
31 #include "runtime/handles.inline.hpp" | |
32 #include "runtime/perfMemory.hpp" | |
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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 | |
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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 | |
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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; | |
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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 | |
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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 | |
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200 // Check if the given statbuf is considered a secure directory for |
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201 // the backing store files. Returns true if the directory is considered |
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202 // a secure location. Returns false if the statbuf is a symbolic link or |
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203 // if an error occurred. |
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204 // |
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205 static bool is_statbuf_secure(struct stat *statp) { |
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206 if (S_ISLNK(statp->st_mode) || !S_ISDIR(statp->st_mode)) { |
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207 // The path represents a link or some non-directory file type, |
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208 // which is not what we expected. Declare it insecure. |
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209 // |
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210 return false; |
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211 } |
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212 // We have an existing directory, check if the permissions are safe. |
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213 // |
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214 if ((statp->st_mode & (S_IWGRP|S_IWOTH)) != 0) { |
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215 // The directory is open for writing and could be subjected |
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216 // to a symlink or a hard link attack. Declare it insecure. |
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217 // |
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218 return false; |
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219 } |
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220 // See if the uid of the directory matches the effective uid of the process. |
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221 // |
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222 if (statp->st_uid != geteuid()) { |
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223 // The directory was not created by this user, declare it insecure. |
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224 // |
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225 return false; |
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226 } |
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227 return true; |
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228 } |
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229 |
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230 |
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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 | |
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245 // The path exists, see if it is secure. |
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246 return is_statbuf_secure(&statbuf); |
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247 } |
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248 |
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249 |
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250 // Check if the given directory file descriptor is considered a secure |
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251 // directory for the backing store files. Returns true if the directory |
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252 // exists and is considered a secure location. Returns false if the path |
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253 // is a symbolic link or if an error occurred. |
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254 // |
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255 static bool is_dirfd_secure(int dir_fd) { |
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256 struct stat statbuf; |
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257 int result = 0; |
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258 |
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259 RESTARTABLE(::fstat(dir_fd, &statbuf), result); |
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260 if (result == OS_ERR) { |
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261 return false; |
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262 } |
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263 |
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264 // The path exists, now check its mode. |
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265 return is_statbuf_secure(&statbuf); |
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266 } |
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267 |
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268 |
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269 // Check to make sure fd1 and fd2 are referencing the same file system object. |
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270 // |
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271 static bool is_same_fsobject(int fd1, int fd2) { |
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272 struct stat statbuf1; |
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273 struct stat statbuf2; |
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274 int result = 0; |
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275 |
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276 RESTARTABLE(::fstat(fd1, &statbuf1), result); |
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277 if (result == OS_ERR) { |
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278 return false; |
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279 } |
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280 RESTARTABLE(::fstat(fd2, &statbuf2), result); |
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281 if (result == OS_ERR) { |
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282 return false; |
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283 } |
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284 |
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285 if ((statbuf1.st_ino == statbuf2.st_ino) && |
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286 (statbuf1.st_dev == statbuf2.st_dev)) { |
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287 return true; |
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288 } else { |
0 | 289 return false; |
290 } | |
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291 } |
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292 |
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293 |
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294 // Open the directory of the given path and validate it. |
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295 // Return a DIR * of the open directory. |
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296 // |
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297 static DIR *open_directory_secure(const char* dirname) { |
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298 // Open the directory using open() so that it can be verified |
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299 // to be secure by calling is_dirfd_secure(), opendir() and then check |
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300 // to see if they are the same file system object. This method does not |
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301 // introduce a window of opportunity for the directory to be attacked that |
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302 // calling opendir() and is_directory_secure() does. |
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303 int result; |
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304 DIR *dirp = NULL; |
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305 RESTARTABLE(::open(dirname, O_RDONLY|O_NOFOLLOW), result); |
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306 if (result == OS_ERR) { |
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307 if (PrintMiscellaneous && Verbose) { |
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308 if (errno == ELOOP) { |
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309 warning("directory %s is a symlink and is not secure\n", dirname); |
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310 } else { |
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311 warning("could not open directory %s: %s\n", dirname, strerror(errno)); |
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312 } |
0 | 313 } |
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314 return dirp; |
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315 } |
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316 int fd = result; |
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317 |
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318 // Determine if the open directory is secure. |
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319 if (!is_dirfd_secure(fd)) { |
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320 // The directory is not a secure directory. |
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321 os::close(fd); |
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322 return dirp; |
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323 } |
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324 |
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325 // Open the directory. |
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326 dirp = ::opendir(dirname); |
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327 if (dirp == NULL) { |
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328 // The directory doesn't exist, close fd and return. |
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329 os::close(fd); |
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330 return dirp; |
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331 } |
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332 |
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333 // Check to make sure fd and dirp are referencing the same file system object. |
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334 if (!is_same_fsobject(fd, dirfd(dirp))) { |
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335 // The directory is not secure. |
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336 os::close(fd); |
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337 os::closedir(dirp); |
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338 dirp = NULL; |
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339 return dirp; |
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340 } |
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341 |
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342 // Close initial open now that we know directory is secure |
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343 os::close(fd); |
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344 |
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345 return dirp; |
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346 } |
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347 |
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348 // NOTE: The code below uses fchdir(), open() and unlink() because |
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349 // fdopendir(), openat() and unlinkat() are not supported on all |
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350 // versions. Once the support for fdopendir(), openat() and unlinkat() |
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351 // is available on all supported versions the code can be changed |
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352 // to use these functions. |
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353 |
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354 // Open the directory of the given path, validate it and set the |
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355 // current working directory to it. |
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356 // Return a DIR * of the open directory and the saved cwd fd. |
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357 // |
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358 static DIR *open_directory_secure_cwd(const char* dirname, int *saved_cwd_fd) { |
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359 |
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360 // Open the directory. |
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361 DIR* dirp = open_directory_secure(dirname); |
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362 if (dirp == NULL) { |
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363 // Directory doesn't exist or is insecure, so there is nothing to cleanup. |
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364 return dirp; |
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365 } |
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366 int fd = dirfd(dirp); |
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367 |
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368 // Open a fd to the cwd and save it off. |
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369 int result; |
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370 RESTARTABLE(::open(".", O_RDONLY), result); |
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371 if (result == OS_ERR) { |
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372 *saved_cwd_fd = -1; |
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373 } else { |
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374 *saved_cwd_fd = result; |
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375 } |
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376 |
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377 // Set the current directory to dirname by using the fd of the directory. |
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378 result = fchdir(fd); |
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379 |
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380 return dirp; |
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381 } |
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382 |
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383 // Close the directory and restore the current working directory. |
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384 // |
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385 static void close_directory_secure_cwd(DIR* dirp, int saved_cwd_fd) { |
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386 |
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387 int result; |
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388 // If we have a saved cwd change back to it and close the fd. |
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389 if (saved_cwd_fd != -1) { |
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390 result = fchdir(saved_cwd_fd); |
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391 ::close(saved_cwd_fd); |
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392 } |
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393 |
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394 // Close the directory. |
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395 os::closedir(dirp); |
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396 } |
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397 |
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398 // Check if the given file descriptor is considered a secure. |
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399 // |
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400 static bool is_file_secure(int fd, const char *filename) { |
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401 |
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402 int result; |
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403 struct stat statbuf; |
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404 |
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405 // Determine if the file is secure. |
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406 RESTARTABLE(::fstat(fd, &statbuf), result); |
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407 if (result == OS_ERR) { |
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408 if (PrintMiscellaneous && Verbose) { |
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409 warning("fstat failed on %s: %s\n", filename, strerror(errno)); |
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410 } |
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411 return false; |
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412 } |
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413 if (statbuf.st_nlink > 1) { |
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414 // A file with multiple links is not expected. |
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415 if (PrintMiscellaneous && Verbose) { |
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416 warning("file %s has multiple links\n", filename); |
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417 } |
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418 return false; |
0 | 419 } |
420 return true; | |
421 } | |
422 | |
423 | |
424 // return the user name for the given user id | |
425 // | |
426 // the caller is expected to free the allocated memory. | |
427 // | |
428 static char* get_user_name(uid_t uid) { | |
429 | |
430 struct passwd pwent; | |
431 | |
432 // determine the max pwbuf size from sysconf, and hardcode | |
433 // a default if this not available through sysconf. | |
434 // | |
435 long bufsize = sysconf(_SC_GETPW_R_SIZE_MAX); | |
436 if (bufsize == -1) | |
437 bufsize = 1024; | |
438 | |
6197 | 439 char* pwbuf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); |
0 | 440 |
441 // POSIX interface to getpwuid_r is used on LINUX | |
442 struct passwd* p; | |
443 int result = getpwuid_r(uid, &pwent, pwbuf, (size_t)bufsize, &p); | |
444 | |
445 if (result != 0 || p == NULL || p->pw_name == NULL || *(p->pw_name) == '\0') { | |
446 if (PrintMiscellaneous && Verbose) { | |
447 if (result != 0) { | |
448 warning("Could not retrieve passwd entry: %s\n", | |
449 strerror(result)); | |
450 } | |
451 else if (p == NULL) { | |
452 // this check is added to protect against an observed problem | |
453 // with getpwuid_r() on RedHat 9 where getpwuid_r returns 0, | |
454 // indicating success, but has p == NULL. This was observed when | |
455 // inserting a file descriptor exhaustion fault prior to the call | |
456 // getpwuid_r() call. In this case, error is set to the appropriate | |
457 // error condition, but this is undocumented behavior. This check | |
458 // is safe under any condition, but the use of errno in the output | |
459 // message may result in an erroneous message. | |
460 // Bug Id 89052 was opened with RedHat. | |
461 // | |
462 warning("Could not retrieve passwd entry: %s\n", | |
463 strerror(errno)); | |
464 } | |
465 else { | |
466 warning("Could not determine user name: %s\n", | |
467 p->pw_name == NULL ? "pw_name = NULL" : | |
468 "pw_name zero length"); | |
469 } | |
470 } | |
6197 | 471 FREE_C_HEAP_ARRAY(char, pwbuf, mtInternal); |
0 | 472 return NULL; |
473 } | |
474 | |
6197 | 475 char* user_name = NEW_C_HEAP_ARRAY(char, strlen(p->pw_name) + 1, mtInternal); |
0 | 476 strcpy(user_name, p->pw_name); |
477 | |
6197 | 478 FREE_C_HEAP_ARRAY(char, pwbuf, mtInternal); |
0 | 479 return user_name; |
480 } | |
481 | |
482 // return the name of the user that owns the process identified by vmid. | |
483 // | |
484 // This method uses a slow directory search algorithm to find the backing | |
485 // store file for the specified vmid and returns the user name, as determined | |
486 // by the user name suffix of the hsperfdata_<username> directory name. | |
487 // | |
488 // the caller is expected to free the allocated memory. | |
489 // | |
490 static char* get_user_name_slow(int vmid, TRAPS) { | |
491 | |
492 // short circuit the directory search if the process doesn't even exist. | |
493 if (kill(vmid, 0) == OS_ERR) { | |
494 if (errno == ESRCH) { | |
495 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), | |
496 "Process not found"); | |
497 } | |
498 else /* EPERM */ { | |
499 THROW_MSG_0(vmSymbols::java_io_IOException(), strerror(errno)); | |
500 } | |
501 } | |
502 | |
503 // directory search | |
504 char* oldest_user = NULL; | |
505 time_t oldest_ctime = 0; | |
506 | |
507 const char* tmpdirname = os::get_temp_directory(); | |
508 | |
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509 // open the temp directory |
0 | 510 DIR* tmpdirp = os::opendir(tmpdirname); |
511 | |
512 if (tmpdirp == NULL) { | |
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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); |
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535 strcat(usrdir_name, "/"); |
0 | 536 strcat(usrdir_name, dentry->d_name); |
537 | |
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538 // open the user directory |
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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 | |
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671 int saved_cwd_fd; |
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672 // open the directory |
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673 DIR* dirp = open_directory_secure_cwd(dirname, &saved_cwd_fd); |
0 | 674 if (dirp == NULL) { |
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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); |
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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 ".." | |
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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))) { | |
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721 unlink(entry->d_name); |
0 | 722 } |
723 errno = 0; | |
724 } | |
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725 |
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726 // close the directory and reset the current working directory |
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727 close_directory_secure_cwd(dirp, saved_cwd_fd); |
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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 | |
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785 int saved_cwd_fd; |
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786 // open the directory and set the current working directory to it |
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787 DIR* dirp = open_directory_secure_cwd(dirname, &saved_cwd_fd); |
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788 if (dirp == NULL) { |
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789 // Directory doesn't exist or is insecure, so cannot create shared |
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790 // memory file. |
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791 return -1; |
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792 } |
0 | 793 |
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794 // Open the filename in the current directory. |
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795 // Cannot use O_TRUNC here; truncation of an existing file has to happen |
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796 // after the is_file_secure() check below. |
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797 int result; |
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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) { | |
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801 if (errno == ELOOP) { |
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802 warning("file %s is a symlink and is not secure\n", filename); |
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803 } else { |
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804 warning("could not create file %s: %s\n", filename, strerror(errno)); |
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805 } |
0 | 806 } |
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807 // close the directory and reset the current working directory |
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808 close_directory_secure_cwd(dirp, saved_cwd_fd); |
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809 |
0 | 810 return -1; |
811 } | |
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|
812 // close the directory and reset the current working directory |
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813 close_directory_secure_cwd(dirp, saved_cwd_fd); |
0 | 814 |
815 // save the file descriptor | |
816 int fd = result; | |
817 | |
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818 // check to see if the file is secure |
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819 if (!is_file_secure(fd, filename)) { |
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820 ::close(fd); |
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821 return -1; |
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822 } |
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823 |
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824 // truncate the file to get rid of any existing data |
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825 RESTARTABLE(::ftruncate(fd, (off_t)0), result); |
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826 if (result == OS_ERR) { |
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827 if (PrintMiscellaneous && Verbose) { |
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828 warning("could not truncate shared memory file: %s\n", strerror(errno)); |
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829 } |
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830 ::close(fd); |
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831 return -1; |
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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 } | |
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839 ::close(fd); |
0 | 840 return -1; |
841 } | |
842 | |
2066
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843 // Verify that we have enough disk space for this file. |
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844 // We'll get random SIGBUS crashes on memory accesses if |
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845 // we don't. |
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|
846 |
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847 for (size_t seekpos = 0; seekpos < size; seekpos += os::vm_page_size()) { |
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848 int zero_int = 0; |
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849 result = (int)os::seek_to_file_offset(fd, (jlong)(seekpos)); |
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850 if (result == -1 ) break; |
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851 RESTARTABLE(::write(fd, &zero_int, 1), result); |
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852 if (result != 1) { |
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853 if (errno == ENOSPC) { |
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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); |
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855 } |
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856 break; |
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|
857 } |
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858 } |
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|
859 |
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|
860 if (result != -1) { |
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|
861 return fd; |
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862 } else { |
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863 ::close(fd); |
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864 return -1; |
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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) { | |
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879 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), |
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880 "Process not found", OS_ERR); |
0 | 881 } |
882 else if (errno == EACCES) { | |
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883 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), |
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884 "Permission denied", OS_ERR); |
0 | 885 } |
886 else { | |
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887 THROW_MSG_(vmSymbols::java_io_IOException(), strerror(errno), OS_ERR); |
0 | 888 } |
889 } | |
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890 int fd = result; |
0 | 891 |
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892 // check to see if the file is secure |
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893 if (!is_file_secure(fd, filename)) { |
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894 ::close(fd); |
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895 return -1; |
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896 } |
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897 |
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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); | |
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929 // get the short filename |
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930 char* short_filename = strrchr(filename, '/'); |
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931 if (short_filename == NULL) { |
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932 short_filename = filename; |
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933 } else { |
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934 short_filename++; |
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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 | |
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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 | |
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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 | |
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973 // it does not go through os api, the operation has to record from here |
20360 | 974 MemTracker::record_virtual_memory_reserve_and_commit((address)mapAddress, size, CURRENT_PC, mtInternal); |
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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; | |
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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; | |
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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; | |
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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 | |
14328 | 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); | |
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1125 } else { |
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1126 size = *sizep; |
0 | 1127 } |
1128 | |
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1129 assert(size > 0, "unexpected size <= 0"); |
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1130 |
0 | 1131 mapAddress = (char*)::mmap((char*)0, size, mmap_prot, MAP_SHARED, fd, 0); |
1132 | |
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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 | |
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1144 // it does not go through os api, the operation has to record from here |
20360 | 1145 MemTracker::record_virtual_memory_reserve_and_commit((address)mapAddress, size, CURRENT_PC, mtInternal); |
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1146 |
0 | 1147 *addr = mapAddress; |
1148 *sizep = size; | |
1149 | |
1150 if (PerfTraceMemOps) { | |
1151 tty->print("mapped " SIZE_FORMAT " bytes for vmid %d at " | |
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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 } |