Mercurial > hg > graal-jvmci-8
annotate src/os/bsd/vm/perfMemory_bsd.cpp @ 24234:ea6f94ab283b default tip
Added tag jvmci-0.36 for changeset 8128b98d4736
author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
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date | Mon, 18 Sep 2017 18:49:45 +0200 |
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3960 | 1 /* |
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2 * Copyright (c) 2001, 2015, Oracle and/or its affiliates. All rights reserved. |
3960 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 * | |
23 */ | |
24 | |
25 #include "precompiled.hpp" | |
26 #include "classfile/vmSymbols.hpp" | |
27 #include "memory/allocation.inline.hpp" | |
28 #include "memory/resourceArea.hpp" | |
29 #include "oops/oop.inline.hpp" | |
30 #include "os_bsd.inline.hpp" | |
31 #include "runtime/handles.inline.hpp" | |
32 #include "runtime/perfMemory.hpp" | |
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33 #include "services/memTracker.hpp" |
3960 | 34 #include "utilities/exceptions.hpp" |
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)) { |
3960 | 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); |
3960 | 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); |
3960 | 131 } |
132 | |
133 | |
134 // Shared Memory Implementation Details | |
135 | |
136 // Note: the solaris and bsd 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 bsd 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; | |
156 size_t nbytes = strlen(tmpdir) + strlen(perfdir) + strlen(user) + 3; | |
6197 | 157 char* dirname = NEW_C_HEAP_ARRAY(char, nbytes, mtInternal); |
3960 | 158 |
159 // construct the path name to user specific tmp directory | |
160 snprintf(dirname, nbytes, "%s/%s_%s", tmpdir, perfdir, user); | |
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 // If user is not root then see if the uid of the directory matches the effective uid of the process. |
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221 uid_t euid = geteuid(); |
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222 if ((euid != 0) && (statp->st_uid != euid)) { |
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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 |
3960 | 232 // the backing store files. Returns true if the directory exists |
233 // and is considered a secure location. Returns false if the path | |
234 // is a symbolic link or if an error occurred. | |
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 { |
3960 | 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 // Directory doesn't exist or is a symlink, so there is nothing to cleanup. |
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308 if (PrintMiscellaneous && Verbose) { |
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309 if (errno == ELOOP) { |
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310 warning("directory %s is a symlink and is not secure\n", dirname); |
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311 } else { |
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312 warning("could not open directory %s: %s\n", dirname, strerror(errno)); |
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313 } |
3960 | 314 } |
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315 return dirp; |
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316 } |
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317 int fd = result; |
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318 |
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319 // Determine if the open directory is secure. |
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320 if (!is_dirfd_secure(fd)) { |
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321 // The directory is not a secure directory. |
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322 os::close(fd); |
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323 return dirp; |
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324 } |
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325 |
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326 // Open the directory. |
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327 dirp = ::opendir(dirname); |
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328 if (dirp == NULL) { |
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329 // The directory doesn't exist, close fd and return. |
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330 os::close(fd); |
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331 return dirp; |
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332 } |
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333 |
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334 // Check to make sure fd and dirp are referencing the same file system object. |
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335 if (!is_same_fsobject(fd, dirfd(dirp))) { |
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336 // The directory is not secure. |
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337 os::close(fd); |
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338 os::closedir(dirp); |
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339 dirp = NULL; |
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340 return dirp; |
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341 } |
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342 |
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343 // Close initial open now that we know directory is secure |
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344 os::close(fd); |
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345 |
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346 return dirp; |
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347 } |
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348 |
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349 // NOTE: The code below uses fchdir(), open() and unlink() because |
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350 // fdopendir(), openat() and unlinkat() are not supported on all |
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351 // versions. Once the support for fdopendir(), openat() and unlinkat() |
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352 // is available on all supported versions the code can be changed |
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353 // to use these functions. |
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354 |
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355 // Open the directory of the given path, validate it and set the |
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356 // current working directory to it. |
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357 // Return a DIR * of the open directory and the saved cwd fd. |
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358 // |
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359 static DIR *open_directory_secure_cwd(const char* dirname, int *saved_cwd_fd) { |
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360 |
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361 // Open the directory. |
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362 DIR* dirp = open_directory_secure(dirname); |
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363 if (dirp == NULL) { |
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364 // Directory doesn't exist or is insecure, so there is nothing to cleanup. |
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365 return dirp; |
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366 } |
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367 int fd = dirfd(dirp); |
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368 |
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369 // Open a fd to the cwd and save it off. |
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370 int result; |
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371 RESTARTABLE(::open(".", O_RDONLY), result); |
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372 if (result == OS_ERR) { |
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373 *saved_cwd_fd = -1; |
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374 } else { |
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375 *saved_cwd_fd = result; |
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376 } |
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377 |
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378 // Set the current directory to dirname by using the fd of the directory and |
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379 // handle errors, otherwise shared memory files will be created in cwd. |
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380 result = fchdir(fd); |
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381 if (result == OS_ERR) { |
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382 if (PrintMiscellaneous && Verbose) { |
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383 warning("could not change to directory %s", dirname); |
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384 } |
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385 if (*saved_cwd_fd != -1) { |
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386 ::close(*saved_cwd_fd); |
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387 *saved_cwd_fd = -1; |
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388 } |
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389 // Close the directory. |
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390 os::closedir(dirp); |
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391 return NULL; |
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392 } else { |
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393 return dirp; |
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394 } |
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395 } |
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396 |
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397 // Close the directory and restore the current working directory. |
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398 // |
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399 static void close_directory_secure_cwd(DIR* dirp, int saved_cwd_fd) { |
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400 |
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401 int result; |
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402 // If we have a saved cwd change back to it and close the fd. |
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403 if (saved_cwd_fd != -1) { |
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404 result = fchdir(saved_cwd_fd); |
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405 ::close(saved_cwd_fd); |
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406 } |
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407 |
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408 // Close the directory. |
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409 os::closedir(dirp); |
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410 } |
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411 |
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412 // Check if the given file descriptor is considered a secure. |
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413 // |
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414 static bool is_file_secure(int fd, const char *filename) { |
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415 |
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416 int result; |
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417 struct stat statbuf; |
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418 |
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419 // Determine if the file is secure. |
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420 RESTARTABLE(::fstat(fd, &statbuf), result); |
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421 if (result == OS_ERR) { |
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422 if (PrintMiscellaneous && Verbose) { |
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423 warning("fstat failed on %s: %s\n", filename, strerror(errno)); |
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424 } |
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425 return false; |
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426 } |
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427 if (statbuf.st_nlink > 1) { |
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428 // A file with multiple links is not expected. |
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429 if (PrintMiscellaneous && Verbose) { |
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430 warning("file %s has multiple links\n", filename); |
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431 } |
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432 return false; |
3960 | 433 } |
434 return true; | |
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); |
3960 | 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); |
3960 | 485 return NULL; |
486 } | |
487 | |
6197 | 488 char* user_name = NEW_C_HEAP_ARRAY(char, strlen(p->pw_name) + 1, mtInternal); |
3960 | 489 strcpy(user_name, p->pw_name); |
490 | |
6197 | 491 FREE_C_HEAP_ARRAY(char, pwbuf, mtInternal); |
3960 | 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 | |
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522 // open the temp directory |
3960 | 523 DIR* tmpdirp = os::opendir(tmpdirname); |
524 | |
525 if (tmpdirp == NULL) { | |
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526 // Cannot open the directory to get the user name, return. |
3960 | 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); |
3960 | 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); |
3960 | 547 strcpy(usrdir_name, tmpdirname); |
548 strcat(usrdir_name, "/"); | |
549 strcat(usrdir_name, dentry->d_name); | |
550 | |
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551 // open the user directory |
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552 DIR* subdirp = open_directory_secure(usrdir_name); |
3960 | 553 |
554 if (subdirp == NULL) { | |
6197 | 555 FREE_C_HEAP_ARRAY(char, usrdir_name, mtInternal); |
3960 | 556 continue; |
557 } | |
558 | |
559 struct dirent* udentry; | |
6197 | 560 char* udbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(usrdir_name), mtInternal); |
3960 | 561 errno = 0; |
562 while ((udentry = os::readdir(subdirp, (struct dirent *)udbuf)) != NULL) { | |
563 | |
564 if (filename_to_pid(udentry->d_name) == vmid) { | |
565 struct stat statbuf; | |
566 int result; | |
567 | |
568 char* filename = NEW_C_HEAP_ARRAY(char, | |
6197 | 569 strlen(usrdir_name) + strlen(udentry->d_name) + 2, mtInternal); |
3960 | 570 |
571 strcpy(filename, usrdir_name); | |
572 strcat(filename, "/"); | |
573 strcat(filename, udentry->d_name); | |
574 | |
575 // don't follow symbolic links for the file | |
576 RESTARTABLE(::lstat(filename, &statbuf), result); | |
577 if (result == OS_ERR) { | |
6197 | 578 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
3960 | 579 continue; |
580 } | |
581 | |
582 // skip over files that are not regular files. | |
583 if (!S_ISREG(statbuf.st_mode)) { | |
6197 | 584 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
3960 | 585 continue; |
586 } | |
587 | |
588 // compare and save filename with latest creation time | |
589 if (statbuf.st_size > 0 && statbuf.st_ctime > oldest_ctime) { | |
590 | |
591 if (statbuf.st_ctime > oldest_ctime) { | |
592 char* user = strchr(dentry->d_name, '_') + 1; | |
593 | |
6197 | 594 if (oldest_user != NULL) FREE_C_HEAP_ARRAY(char, oldest_user, mtInternal); |
595 oldest_user = NEW_C_HEAP_ARRAY(char, strlen(user)+1, mtInternal); | |
3960 | 596 |
597 strcpy(oldest_user, user); | |
598 oldest_ctime = statbuf.st_ctime; | |
599 } | |
600 } | |
601 | |
6197 | 602 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
3960 | 603 } |
604 } | |
605 os::closedir(subdirp); | |
6197 | 606 FREE_C_HEAP_ARRAY(char, udbuf, mtInternal); |
607 FREE_C_HEAP_ARRAY(char, usrdir_name, mtInternal); | |
3960 | 608 } |
609 os::closedir(tmpdirp); | |
6197 | 610 FREE_C_HEAP_ARRAY(char, tdbuf, mtInternal); |
3960 | 611 |
612 return(oldest_user); | |
613 } | |
614 | |
615 // return the name of the user that owns the JVM indicated by the given vmid. | |
616 // | |
617 static char* get_user_name(int vmid, TRAPS) { | |
618 return get_user_name_slow(vmid, CHECK_NULL); | |
619 } | |
620 | |
621 // return the file name of the backing store file for the named | |
622 // shared memory region for the given user name and vmid. | |
623 // | |
624 // the caller is expected to free the allocated memory. | |
625 // | |
626 static char* get_sharedmem_filename(const char* dirname, int vmid) { | |
627 | |
628 // add 2 for the file separator and a null terminator. | |
629 size_t nbytes = strlen(dirname) + UINT_CHARS + 2; | |
630 | |
6197 | 631 char* name = NEW_C_HEAP_ARRAY(char, nbytes, mtInternal); |
3960 | 632 snprintf(name, nbytes, "%s/%d", dirname, vmid); |
633 | |
634 return name; | |
635 } | |
636 | |
637 | |
638 // remove file | |
639 // | |
640 // this method removes the file specified by the given path | |
641 // | |
642 static void remove_file(const char* path) { | |
643 | |
644 int result; | |
645 | |
646 // if the file is a directory, the following unlink will fail. since | |
647 // we don't expect to find directories in the user temp directory, we | |
648 // won't try to handle this situation. even if accidentially or | |
649 // maliciously planted, the directory's presence won't hurt anything. | |
650 // | |
651 RESTARTABLE(::unlink(path), result); | |
652 if (PrintMiscellaneous && Verbose && result == OS_ERR) { | |
653 if (errno != ENOENT) { | |
654 warning("Could not unlink shared memory backing" | |
655 " store file %s : %s\n", path, strerror(errno)); | |
656 } | |
657 } | |
658 } | |
659 | |
660 | |
661 // cleanup stale shared memory resources | |
662 // | |
663 // This method attempts to remove all stale shared memory files in | |
664 // the named user temporary directory. It scans the named directory | |
665 // for files matching the pattern ^$[0-9]*$. For each file found, the | |
666 // process id is extracted from the file name and a test is run to | |
667 // determine if the process is alive. If the process is not alive, | |
668 // any stale file resources are removed. | |
669 // | |
670 static void cleanup_sharedmem_resources(const char* dirname) { | |
671 | |
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672 int saved_cwd_fd; |
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673 // open the directory and set the current working directory to it |
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674 DIR* dirp = open_directory_secure_cwd(dirname, &saved_cwd_fd); |
3960 | 675 if (dirp == NULL) { |
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676 // directory doesn't exist or is insecure, so there is nothing to cleanup |
3960 | 677 return; |
678 } | |
679 | |
680 // for each entry in the directory that matches the expected file | |
681 // name pattern, determine if the file resources are stale and if | |
682 // so, remove the file resources. Note, instrumented HotSpot processes | |
683 // for this user may start and/or terminate during this search and | |
684 // remove or create new files in this directory. The behavior of this | |
685 // loop under these conditions is dependent upon the implementation of | |
686 // opendir/readdir. | |
687 // | |
688 struct dirent* entry; | |
6197 | 689 char* dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(dirname), mtInternal); |
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690 |
3960 | 691 errno = 0; |
692 while ((entry = os::readdir(dirp, (struct dirent *)dbuf)) != NULL) { | |
693 | |
694 pid_t pid = filename_to_pid(entry->d_name); | |
695 | |
696 if (pid == 0) { | |
697 | |
698 if (strcmp(entry->d_name, ".") != 0 && strcmp(entry->d_name, "..") != 0) { | |
699 | |
700 // attempt to remove all unexpected files, except "." and ".." | |
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701 unlink(entry->d_name); |
3960 | 702 } |
703 | |
704 errno = 0; | |
705 continue; | |
706 } | |
707 | |
708 // we now have a file name that converts to a valid integer | |
709 // that could represent a process id . if this process id | |
710 // matches the current process id or the process is not running, | |
711 // then remove the stale file resources. | |
712 // | |
713 // process liveness is detected by sending signal number 0 to | |
714 // the process id (see kill(2)). if kill determines that the | |
715 // process does not exist, then the file resources are removed. | |
716 // if kill determines that that we don't have permission to | |
717 // signal the process, then the file resources are assumed to | |
718 // be stale and are removed because the resources for such a | |
719 // process should be in a different user specific directory. | |
720 // | |
721 if ((pid == os::current_process_id()) || | |
722 (kill(pid, 0) == OS_ERR && (errno == ESRCH || errno == EPERM))) { | |
723 | |
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724 unlink(entry->d_name); |
3960 | 725 } |
726 errno = 0; | |
727 } | |
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728 |
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729 // close the directory and reset the current working directory |
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730 close_directory_secure_cwd(dirp, saved_cwd_fd); |
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731 |
6197 | 732 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); |
3960 | 733 } |
734 | |
735 // make the user specific temporary directory. Returns true if | |
736 // the directory exists and is secure upon return. Returns false | |
737 // if the directory exists but is either a symlink, is otherwise | |
738 // insecure, or if an error occurred. | |
739 // | |
740 static bool make_user_tmp_dir(const char* dirname) { | |
741 | |
742 // create the directory with 0755 permissions. note that the directory | |
743 // will be owned by euid::egid, which may not be the same as uid::gid. | |
744 // | |
745 if (mkdir(dirname, S_IRWXU|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH) == OS_ERR) { | |
746 if (errno == EEXIST) { | |
747 // The directory already exists and was probably created by another | |
748 // JVM instance. However, this could also be the result of a | |
749 // deliberate symlink. Verify that the existing directory is safe. | |
750 // | |
751 if (!is_directory_secure(dirname)) { | |
752 // directory is not secure | |
753 if (PrintMiscellaneous && Verbose) { | |
754 warning("%s directory is insecure\n", dirname); | |
755 } | |
756 return false; | |
757 } | |
758 } | |
759 else { | |
760 // we encountered some other failure while attempting | |
761 // to create the directory | |
762 // | |
763 if (PrintMiscellaneous && Verbose) { | |
764 warning("could not create directory %s: %s\n", | |
765 dirname, strerror(errno)); | |
766 } | |
767 return false; | |
768 } | |
769 } | |
770 return true; | |
771 } | |
772 | |
773 // create the shared memory file resources | |
774 // | |
775 // This method creates the shared memory file with the given size | |
776 // This method also creates the user specific temporary directory, if | |
777 // it does not yet exist. | |
778 // | |
779 static int create_sharedmem_resources(const char* dirname, const char* filename, size_t size) { | |
780 | |
781 // make the user temporary directory | |
782 if (!make_user_tmp_dir(dirname)) { | |
783 // could not make/find the directory or the found directory | |
784 // was not secure | |
785 return -1; | |
786 } | |
787 | |
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788 int saved_cwd_fd; |
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789 // open the directory and set the current working directory to it |
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790 DIR* dirp = open_directory_secure_cwd(dirname, &saved_cwd_fd); |
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791 if (dirp == NULL) { |
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792 // Directory doesn't exist or is insecure, so cannot create shared |
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793 // memory file. |
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794 return -1; |
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795 } |
3960 | 796 |
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797 // Open the filename in the current directory. |
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798 // Cannot use O_TRUNC here; truncation of an existing file has to happen |
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799 // after the is_file_secure() check below. |
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800 int result; |
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801 RESTARTABLE(::open(filename, O_RDWR|O_CREAT|O_NOFOLLOW, S_IREAD|S_IWRITE), result); |
3960 | 802 if (result == OS_ERR) { |
803 if (PrintMiscellaneous && Verbose) { | |
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804 if (errno == ELOOP) { |
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805 warning("file %s is a symlink and is not secure\n", filename); |
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806 } else { |
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807 warning("could not create file %s: %s\n", filename, strerror(errno)); |
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808 } |
3960 | 809 } |
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810 // close the directory and reset the current working directory |
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811 close_directory_secure_cwd(dirp, saved_cwd_fd); |
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812 |
3960 | 813 return -1; |
814 } | |
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815 // close the directory and reset the current working directory |
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816 close_directory_secure_cwd(dirp, saved_cwd_fd); |
3960 | 817 |
818 // save the file descriptor | |
819 int fd = result; | |
820 | |
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821 // check to see if the file is secure |
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822 if (!is_file_secure(fd, filename)) { |
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823 ::close(fd); |
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824 return -1; |
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825 } |
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826 |
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827 // truncate the file to get rid of any existing data |
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828 RESTARTABLE(::ftruncate(fd, (off_t)0), result); |
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829 if (result == OS_ERR) { |
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830 if (PrintMiscellaneous && Verbose) { |
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831 warning("could not truncate shared memory file: %s\n", strerror(errno)); |
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832 } |
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833 ::close(fd); |
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834 return -1; |
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835 } |
3960 | 836 // set the file size |
837 RESTARTABLE(::ftruncate(fd, (off_t)size), result); | |
838 if (result == OS_ERR) { | |
839 if (PrintMiscellaneous && Verbose) { | |
840 warning("could not set shared memory file size: %s\n", strerror(errno)); | |
841 } | |
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842 ::close(fd); |
3960 | 843 return -1; |
844 } | |
845 | |
846 // Verify that we have enough disk space for this file. | |
847 // We'll get random SIGBUS crashes on memory accesses if | |
848 // we don't. | |
849 | |
850 for (size_t seekpos = 0; seekpos < size; seekpos += os::vm_page_size()) { | |
851 int zero_int = 0; | |
852 result = (int)os::seek_to_file_offset(fd, (jlong)(seekpos)); | |
853 if (result == -1 ) break; | |
854 RESTARTABLE(::write(fd, &zero_int, 1), result); | |
855 if (result != 1) { | |
856 if (errno == ENOSPC) { | |
857 warning("Insufficient space for shared memory file:\n %s\nTry using the -Djava.io.tmpdir= option to select an alternate temp location.\n", filename); | |
858 } | |
859 break; | |
860 } | |
861 } | |
862 | |
863 if (result != -1) { | |
864 return fd; | |
865 } else { | |
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866 ::close(fd); |
3960 | 867 return -1; |
868 } | |
869 } | |
870 | |
871 // open the shared memory file for the given user and vmid. returns | |
872 // the file descriptor for the open file or -1 if the file could not | |
873 // be opened. | |
874 // | |
875 static int open_sharedmem_file(const char* filename, int oflags, TRAPS) { | |
876 | |
877 // open the file | |
878 int result; | |
879 RESTARTABLE(::open(filename, oflags), result); | |
880 if (result == OS_ERR) { | |
881 if (errno == ENOENT) { | |
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882 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), |
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883 "Process not found", OS_ERR); |
3960 | 884 } |
885 else if (errno == EACCES) { | |
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886 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), |
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887 "Permission denied", OS_ERR); |
3960 | 888 } |
889 else { | |
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890 THROW_MSG_(vmSymbols::java_io_IOException(), strerror(errno), OS_ERR); |
3960 | 891 } |
892 } | |
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893 int fd = result; |
3960 | 894 |
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895 // check to see if the file is secure |
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896 if (!is_file_secure(fd, filename)) { |
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897 ::close(fd); |
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898 return -1; |
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899 } |
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900 |
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901 return fd; |
3960 | 902 } |
903 | |
904 // create a named shared memory region. returns the address of the | |
905 // memory region on success or NULL on failure. A return value of | |
906 // NULL will ultimately disable the shared memory feature. | |
907 // | |
908 // On Solaris and Bsd, the name space for shared memory objects | |
909 // is the file system name space. | |
910 // | |
911 // A monitoring application attaching to a JVM does not need to know | |
912 // the file system name of the shared memory object. However, it may | |
913 // be convenient for applications to discover the existence of newly | |
914 // created and terminating JVMs by watching the file system name space | |
915 // for files being created or removed. | |
916 // | |
917 static char* mmap_create_shared(size_t size) { | |
918 | |
919 int result; | |
920 int fd; | |
921 char* mapAddress; | |
922 | |
923 int vmid = os::current_process_id(); | |
924 | |
925 char* user_name = get_user_name(geteuid()); | |
926 | |
927 if (user_name == NULL) | |
928 return NULL; | |
929 | |
930 char* dirname = get_user_tmp_dir(user_name); | |
931 char* filename = get_sharedmem_filename(dirname, vmid); | |
932 | |
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933 // get the short filename |
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934 char* short_filename = strrchr(filename, '/'); |
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935 if (short_filename == NULL) { |
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936 short_filename = filename; |
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937 } else { |
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938 short_filename++; |
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939 } |
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940 |
3960 | 941 // cleanup any stale shared memory files |
942 cleanup_sharedmem_resources(dirname); | |
943 | |
944 assert(((size > 0) && (size % os::vm_page_size() == 0)), | |
945 "unexpected PerfMemory region size"); | |
946 | |
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947 fd = create_sharedmem_resources(dirname, short_filename, size); |
3960 | 948 |
6197 | 949 FREE_C_HEAP_ARRAY(char, user_name, mtInternal); |
950 FREE_C_HEAP_ARRAY(char, dirname, mtInternal); | |
3960 | 951 |
952 if (fd == -1) { | |
6197 | 953 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
3960 | 954 return NULL; |
955 } | |
956 | |
957 mapAddress = (char*)::mmap((char*)0, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0); | |
958 | |
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959 result = ::close(fd); |
3960 | 960 assert(result != OS_ERR, "could not close file"); |
961 | |
962 if (mapAddress == MAP_FAILED) { | |
963 if (PrintMiscellaneous && Verbose) { | |
964 warning("mmap failed - %s\n", strerror(errno)); | |
965 } | |
966 remove_file(filename); | |
6197 | 967 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
3960 | 968 return NULL; |
969 } | |
970 | |
971 // save the file name for use in delete_shared_memory() | |
972 backing_store_file_name = filename; | |
973 | |
974 // clear the shared memory region | |
975 (void)::memset((void*) mapAddress, 0, size); | |
976 | |
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977 // it does not go through os api, the operation has to record from here |
20360 | 978 MemTracker::record_virtual_memory_reserve_and_commit((address)mapAddress, size, CURRENT_PC, mtInternal); |
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979 |
3960 | 980 return mapAddress; |
981 } | |
982 | |
983 // release a named shared memory region | |
984 // | |
985 static void unmap_shared(char* addr, size_t bytes) { | |
986 os::release_memory(addr, bytes); | |
987 } | |
988 | |
989 // create the PerfData memory region in shared memory. | |
990 // | |
991 static char* create_shared_memory(size_t size) { | |
992 | |
993 // create the shared memory region. | |
994 return mmap_create_shared(size); | |
995 } | |
996 | |
997 // delete the shared PerfData memory region | |
998 // | |
999 static void delete_shared_memory(char* addr, size_t size) { | |
1000 | |
1001 // cleanup the persistent shared memory resources. since DestroyJavaVM does | |
1002 // not support unloading of the JVM, unmapping of the memory resource is | |
1003 // not performed. The memory will be reclaimed by the OS upon termination of | |
1004 // the process. The backing store file is deleted from the file system. | |
1005 | |
1006 assert(!PerfDisableSharedMem, "shouldn't be here"); | |
1007 | |
1008 if (backing_store_file_name != NULL) { | |
1009 remove_file(backing_store_file_name); | |
1010 // Don't.. Free heap memory could deadlock os::abort() if it is called | |
1011 // from signal handler. OS will reclaim the heap memory. | |
1012 // FREE_C_HEAP_ARRAY(char, backing_store_file_name); | |
1013 backing_store_file_name = NULL; | |
1014 } | |
1015 } | |
1016 | |
1017 // return the size of the file for the given file descriptor | |
1018 // or 0 if it is not a valid size for a shared memory file | |
1019 // | |
1020 static size_t sharedmem_filesize(int fd, TRAPS) { | |
1021 | |
1022 struct stat statbuf; | |
1023 int result; | |
1024 | |
1025 RESTARTABLE(::fstat(fd, &statbuf), result); | |
1026 if (result == OS_ERR) { | |
1027 if (PrintMiscellaneous && Verbose) { | |
1028 warning("fstat failed: %s\n", strerror(errno)); | |
1029 } | |
1030 THROW_MSG_0(vmSymbols::java_io_IOException(), | |
1031 "Could not determine PerfMemory size"); | |
1032 } | |
1033 | |
1034 if ((statbuf.st_size == 0) || | |
1035 ((size_t)statbuf.st_size % os::vm_page_size() != 0)) { | |
1036 THROW_MSG_0(vmSymbols::java_lang_Exception(), | |
1037 "Invalid PerfMemory size"); | |
1038 } | |
1039 | |
1040 return (size_t)statbuf.st_size; | |
1041 } | |
1042 | |
1043 // attach to a named shared memory region. | |
1044 // | |
1045 static void mmap_attach_shared(const char* user, int vmid, PerfMemory::PerfMemoryMode mode, char** addr, size_t* sizep, TRAPS) { | |
1046 | |
1047 char* mapAddress; | |
1048 int result; | |
1049 int fd; | |
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1050 size_t size = 0; |
3960 | 1051 const char* luser = NULL; |
1052 | |
1053 int mmap_prot; | |
1054 int file_flags; | |
1055 | |
1056 ResourceMark rm; | |
1057 | |
1058 // map the high level access mode to the appropriate permission | |
1059 // constructs for the file and the shared memory mapping. | |
1060 if (mode == PerfMemory::PERF_MODE_RO) { | |
1061 mmap_prot = PROT_READ; | |
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1062 file_flags = O_RDONLY | O_NOFOLLOW; |
3960 | 1063 } |
1064 else if (mode == PerfMemory::PERF_MODE_RW) { | |
1065 #ifdef LATER | |
1066 mmap_prot = PROT_READ | PROT_WRITE; | |
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1067 file_flags = O_RDWR | O_NOFOLLOW; |
3960 | 1068 #else |
1069 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), | |
1070 "Unsupported access mode"); | |
1071 #endif | |
1072 } | |
1073 else { | |
1074 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), | |
1075 "Illegal access mode"); | |
1076 } | |
1077 | |
1078 if (user == NULL || strlen(user) == 0) { | |
1079 luser = get_user_name(vmid, CHECK); | |
1080 } | |
1081 else { | |
1082 luser = user; | |
1083 } | |
1084 | |
1085 if (luser == NULL) { | |
1086 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), | |
1087 "Could not map vmid to user Name"); | |
1088 } | |
1089 | |
1090 char* dirname = get_user_tmp_dir(luser); | |
1091 | |
1092 // since we don't follow symbolic links when creating the backing | |
1093 // store file, we don't follow them when attaching either. | |
1094 // | |
1095 if (!is_directory_secure(dirname)) { | |
6197 | 1096 FREE_C_HEAP_ARRAY(char, dirname, mtInternal); |
3960 | 1097 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), |
1098 "Process not found"); | |
1099 } | |
1100 | |
1101 char* filename = get_sharedmem_filename(dirname, vmid); | |
1102 | |
1103 // copy heap memory to resource memory. the open_sharedmem_file | |
1104 // method below need to use the filename, but could throw an | |
1105 // exception. using a resource array prevents the leak that | |
1106 // would otherwise occur. | |
1107 char* rfilename = NEW_RESOURCE_ARRAY(char, strlen(filename) + 1); | |
1108 strcpy(rfilename, filename); | |
1109 | |
1110 // free the c heap resources that are no longer needed | |
6197 | 1111 if (luser != user) FREE_C_HEAP_ARRAY(char, luser, mtInternal); |
1112 FREE_C_HEAP_ARRAY(char, dirname, mtInternal); | |
1113 FREE_C_HEAP_ARRAY(char, filename, mtInternal); | |
3960 | 1114 |
1115 // open the shared memory file for the give vmid | |
1116 fd = open_sharedmem_file(rfilename, file_flags, CHECK); | |
1117 assert(fd != OS_ERR, "unexpected value"); | |
1118 | |
1119 if (*sizep == 0) { | |
1120 size = sharedmem_filesize(fd, CHECK); | |
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1121 } else { |
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1122 size = *sizep; |
3960 | 1123 } |
1124 | |
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1125 assert(size > 0, "unexpected size <= 0"); |
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1126 |
3960 | 1127 mapAddress = (char*)::mmap((char*)0, size, mmap_prot, MAP_SHARED, fd, 0); |
1128 | |
1129 // attempt to close the file - restart if it gets interrupted, | |
1130 // but ignore other failures | |
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1131 result = ::close(fd); |
3960 | 1132 assert(result != OS_ERR, "could not close file"); |
1133 | |
1134 if (mapAddress == MAP_FAILED) { | |
1135 if (PrintMiscellaneous && Verbose) { | |
1136 warning("mmap failed: %s\n", strerror(errno)); | |
1137 } | |
1138 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), | |
1139 "Could not map PerfMemory"); | |
1140 } | |
1141 | |
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1142 // it does not go through os api, the operation has to record from here |
20360 | 1143 MemTracker::record_virtual_memory_reserve_and_commit((address)mapAddress, size, CURRENT_PC, mtInternal); |
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1144 |
3960 | 1145 *addr = mapAddress; |
1146 *sizep = size; | |
1147 | |
1148 if (PerfTraceMemOps) { | |
1149 tty->print("mapped " SIZE_FORMAT " bytes for vmid %d at " | |
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1150 INTPTR_FORMAT "\n", size, vmid, p2i((void*)mapAddress)); |
3960 | 1151 } |
1152 } | |
1153 | |
1154 | |
1155 | |
1156 | |
1157 // create the PerfData memory region | |
1158 // | |
1159 // This method creates the memory region used to store performance | |
1160 // data for the JVM. The memory may be created in standard or | |
1161 // shared memory. | |
1162 // | |
1163 void PerfMemory::create_memory_region(size_t size) { | |
1164 | |
1165 if (PerfDisableSharedMem) { | |
1166 // do not share the memory for the performance data. | |
1167 _start = create_standard_memory(size); | |
1168 } | |
1169 else { | |
1170 _start = create_shared_memory(size); | |
1171 if (_start == NULL) { | |
1172 | |
1173 // creation of the shared memory region failed, attempt | |
1174 // to create a contiguous, non-shared memory region instead. | |
1175 // | |
1176 if (PrintMiscellaneous && Verbose) { | |
1177 warning("Reverting to non-shared PerfMemory region.\n"); | |
1178 } | |
1179 PerfDisableSharedMem = true; | |
1180 _start = create_standard_memory(size); | |
1181 } | |
1182 } | |
1183 | |
1184 if (_start != NULL) _capacity = size; | |
1185 | |
1186 } | |
1187 | |
1188 // delete the PerfData memory region | |
1189 // | |
1190 // This method deletes the memory region used to store performance | |
1191 // data for the JVM. The memory region indicated by the <address, size> | |
1192 // tuple will be inaccessible after a call to this method. | |
1193 // | |
1194 void PerfMemory::delete_memory_region() { | |
1195 | |
1196 assert((start() != NULL && capacity() > 0), "verify proper state"); | |
1197 | |
1198 // If user specifies PerfDataSaveFile, it will save the performance data | |
1199 // to the specified file name no matter whether PerfDataSaveToFile is specified | |
1200 // or not. In other word, -XX:PerfDataSaveFile=.. overrides flag | |
1201 // -XX:+PerfDataSaveToFile. | |
1202 if (PerfDataSaveToFile || PerfDataSaveFile != NULL) { | |
1203 save_memory_to_file(start(), capacity()); | |
1204 } | |
1205 | |
1206 if (PerfDisableSharedMem) { | |
1207 delete_standard_memory(start(), capacity()); | |
1208 } | |
1209 else { | |
1210 delete_shared_memory(start(), capacity()); | |
1211 } | |
1212 } | |
1213 | |
1214 // attach to the PerfData memory region for another JVM | |
1215 // | |
1216 // This method returns an <address, size> tuple that points to | |
1217 // a memory buffer that is kept reasonably synchronized with | |
1218 // the PerfData memory region for the indicated JVM. This | |
1219 // buffer may be kept in synchronization via shared memory | |
1220 // or some other mechanism that keeps the buffer updated. | |
1221 // | |
1222 // If the JVM chooses not to support the attachability feature, | |
1223 // this method should throw an UnsupportedOperation exception. | |
1224 // | |
1225 // This implementation utilizes named shared memory to map | |
1226 // the indicated process's PerfData memory region into this JVMs | |
1227 // address space. | |
1228 // | |
1229 void PerfMemory::attach(const char* user, int vmid, PerfMemoryMode mode, char** addrp, size_t* sizep, TRAPS) { | |
1230 | |
1231 if (vmid == 0 || vmid == os::current_process_id()) { | |
1232 *addrp = start(); | |
1233 *sizep = capacity(); | |
1234 return; | |
1235 } | |
1236 | |
1237 mmap_attach_shared(user, vmid, mode, addrp, sizep, CHECK); | |
1238 } | |
1239 | |
1240 // detach from the PerfData memory region of another JVM | |
1241 // | |
1242 // This method detaches the PerfData memory region of another | |
1243 // JVM, specified as an <address, size> tuple of a buffer | |
1244 // in this process's address space. This method may perform | |
1245 // arbitrary actions to accomplish the detachment. The memory | |
1246 // region specified by <address, size> will be inaccessible after | |
1247 // a call to this method. | |
1248 // | |
1249 // If the JVM chooses not to support the attachability feature, | |
1250 // this method should throw an UnsupportedOperation exception. | |
1251 // | |
1252 // This implementation utilizes named shared memory to detach | |
1253 // the indicated process's PerfData memory region from this | |
1254 // process's address space. | |
1255 // | |
1256 void PerfMemory::detach(char* addr, size_t bytes, TRAPS) { | |
1257 | |
1258 assert(addr != 0, "address sanity check"); | |
1259 assert(bytes > 0, "capacity sanity check"); | |
1260 | |
1261 if (PerfMemory::contains(addr) || PerfMemory::contains(addr + bytes - 1)) { | |
1262 // prevent accidental detachment of this process's PerfMemory region | |
1263 return; | |
1264 } | |
1265 | |
1266 unmap_shared(addr, bytes); | |
1267 } | |
1268 | |
1269 char* PerfMemory::backing_store_filename() { | |
1270 return backing_store_file_name; | |
1271 } |