| File: | jdk/src/hotspot/os/posix/perfMemory_posix.cpp |
| Warning: | line 416, column 5 Value stored to 'result' is never read |
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| 1 | /* |
| 2 | * Copyright (c) 2001, 2021, Oracle and/or its affiliates. All rights reserved. |
| 3 | * Copyright (c) 2012, 2021 SAP SE. All rights reserved. |
| 4 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 5 | * |
| 6 | * This code is free software; you can redistribute it and/or modify it |
| 7 | * under the terms of the GNU General Public License version 2 only, as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 13 | * version 2 for more details (a copy is included in the LICENSE file that |
| 14 | * accompanied this code). |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License version |
| 17 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 18 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 19 | * |
| 20 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| 21 | * or visit www.oracle.com if you need additional information or have any |
| 22 | * questions. |
| 23 | * |
| 24 | */ |
| 25 | |
| 26 | #include "precompiled.hpp" |
| 27 | #include "jvm_io.h" |
| 28 | #include "classfile/vmSymbols.hpp" |
| 29 | #include "logging/log.hpp" |
| 30 | #include "memory/allocation.inline.hpp" |
| 31 | #include "memory/resourceArea.hpp" |
| 32 | #include "oops/oop.inline.hpp" |
| 33 | #include "os_posix.inline.hpp" |
| 34 | #include "runtime/globals_extension.hpp" |
| 35 | #include "runtime/handles.inline.hpp" |
| 36 | #include "runtime/os.hpp" |
| 37 | #include "runtime/perfMemory.hpp" |
| 38 | #include "services/memTracker.hpp" |
| 39 | #include "utilities/exceptions.hpp" |
| 40 | |
| 41 | // put OS-includes here |
| 42 | # include <sys/types.h> |
| 43 | # include <sys/mman.h> |
| 44 | # include <errno(*__errno_location ()).h> |
| 45 | # include <stdio.h> |
| 46 | # include <unistd.h> |
| 47 | # include <sys/stat.h> |
| 48 | # include <signal.h> |
| 49 | # include <pwd.h> |
| 50 | |
| 51 | static char* backing_store_file_name = NULL__null; // name of the backing store |
| 52 | // file, if successfully created. |
| 53 | |
| 54 | // Standard Memory Implementation Details |
| 55 | |
| 56 | // create the PerfData memory region in standard memory. |
| 57 | // |
| 58 | static char* create_standard_memory(size_t size) { |
| 59 | |
| 60 | // allocate an aligned chuck of memory |
| 61 | char* mapAddress = os::reserve_memory(size); |
| 62 | |
| 63 | if (mapAddress == NULL__null) { |
| 64 | return NULL__null; |
| 65 | } |
| 66 | |
| 67 | // commit memory |
| 68 | if (!os::commit_memory(mapAddress, size, !ExecMem)) { |
| 69 | if (PrintMiscellaneous && Verbose) { |
| 70 | warning("Could not commit PerfData memory\n"); |
| 71 | } |
| 72 | os::release_memory(mapAddress, size); |
| 73 | return NULL__null; |
| 74 | } |
| 75 | |
| 76 | return mapAddress; |
| 77 | } |
| 78 | |
| 79 | // delete the PerfData memory region |
| 80 | // |
| 81 | static void delete_standard_memory(char* addr, size_t size) { |
| 82 | |
| 83 | // there are no persistent external resources to cleanup for standard |
| 84 | // memory. since DestroyJavaVM does not support unloading of the JVM, |
| 85 | // cleanup of the memory resource is not performed. The memory will be |
| 86 | // reclaimed by the OS upon termination of the process. |
| 87 | // |
| 88 | return; |
| 89 | } |
| 90 | |
| 91 | // save the specified memory region to the given file |
| 92 | // |
| 93 | // Note: this function might be called from signal handler (by os::abort()), |
| 94 | // don't allocate heap memory. |
| 95 | // |
| 96 | static void save_memory_to_file(char* addr, size_t size) { |
| 97 | |
| 98 | const char* destfile = PerfMemory::get_perfdata_file_path(); |
| 99 | assert(destfile[0] != '\0', "invalid PerfData file path")do { if (!(destfile[0] != '\0')) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 99, "assert(" "destfile[0] != '\\0'" ") failed", "invalid PerfData file path" ); ::breakpoint(); } } while (0); |
| 100 | |
| 101 | int result; |
| 102 | |
| 103 | RESTARTABLE(os::open(destfile, O_CREAT|O_WRONLY|O_TRUNC, S_IRUSR|S_IWUSR),do { result = os::open(destfile, 0100|01|01000, 0400|0200); } while(((int)result == OS_ERR) && ((*__errno_location ()) == 4)) |
| 104 | result)do { result = os::open(destfile, 0100|01|01000, 0400|0200); } while(((int)result == OS_ERR) && ((*__errno_location ()) == 4)); |
| 105 | if (result == OS_ERR) { |
| 106 | if (PrintMiscellaneous && Verbose) { |
| 107 | warning("Could not create Perfdata save file: %s: %s\n", |
| 108 | destfile, os::strerror(errno(*__errno_location ()))); |
| 109 | } |
| 110 | } else { |
| 111 | int fd = result; |
| 112 | |
| 113 | for (size_t remaining = size; remaining > 0;) { |
| 114 | |
| 115 | RESTARTABLE(::write(fd, addr, remaining), result)do { result = ::write(fd, addr, remaining); } while(((int)result == OS_ERR) && ((*__errno_location ()) == 4)); |
| 116 | if (result == OS_ERR) { |
| 117 | if (PrintMiscellaneous && Verbose) { |
| 118 | warning("Could not write Perfdata save file: %s: %s\n", |
| 119 | destfile, os::strerror(errno(*__errno_location ()))); |
| 120 | } |
| 121 | break; |
| 122 | } |
| 123 | |
| 124 | remaining -= (size_t)result; |
| 125 | addr += result; |
| 126 | } |
| 127 | |
| 128 | result = ::close(fd); |
| 129 | if (PrintMiscellaneous && Verbose) { |
| 130 | if (result == OS_ERR) { |
| 131 | warning("Could not close %s: %s\n", destfile, os::strerror(errno(*__errno_location ()))); |
| 132 | } |
| 133 | } |
| 134 | } |
| 135 | FREE_C_HEAP_ARRAY(char, destfile)FreeHeap((char*)(destfile)); |
| 136 | } |
| 137 | |
| 138 | |
| 139 | // Shared Memory Implementation Details |
| 140 | |
| 141 | // Note: the Posix shared memory implementation uses the mmap |
| 142 | // interface with a backing store file to implement named shared memory. |
| 143 | // Using the file system as the name space for shared memory allows a |
| 144 | // common name space to be supported across a variety of platforms. It |
| 145 | // also provides a name space that Java applications can deal with through |
| 146 | // simple file apis. |
| 147 | // |
| 148 | |
| 149 | // return the user specific temporary directory name. |
| 150 | // the caller is expected to free the allocated memory. |
| 151 | // |
| 152 | #define TMP_BUFFER_LEN(4+22) (4+22) |
| 153 | static char* get_user_tmp_dir(const char* user, int vmid, int nspid) { |
| 154 | char* tmpdir = (char *)os::get_temp_directory(); |
| 155 | #if defined(LINUX1) |
| 156 | // On linux, if containerized process, get dirname of |
| 157 | // /proc/{vmid}/root/tmp/{PERFDATA_NAME_user} |
| 158 | // otherwise /tmp/{PERFDATA_NAME_user} |
| 159 | char buffer[TMP_BUFFER_LEN(4+22)]; |
| 160 | assert(strlen(tmpdir) == 4, "No longer using /tmp - update buffer size")do { if (!(strlen(tmpdir) == 4)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 160, "assert(" "strlen(tmpdir) == 4" ") failed", "No longer using /tmp - update buffer size" ); ::breakpoint(); } } while (0); |
| 161 | |
| 162 | if (nspid != -1) { |
| 163 | jio_snprintf(buffer, TMP_BUFFER_LEN(4+22), "/proc/%d/root%s", vmid, tmpdir); |
| 164 | tmpdir = buffer; |
| 165 | } |
| 166 | #endif |
| 167 | const char* perfdir = PERFDATA_NAME; |
| 168 | size_t nbytes = strlen(tmpdir) + strlen(perfdir) + strlen(user) + 3; |
| 169 | char* dirname = NEW_C_HEAP_ARRAY(char, nbytes, mtInternal)(char*) (AllocateHeap((nbytes) * sizeof(char), mtInternal)); |
| 170 | |
| 171 | // construct the path name to user specific tmp directory |
| 172 | snprintf(dirname, nbytes, "%s/%s_%s", tmpdir, perfdir, user); |
| 173 | |
| 174 | return dirname; |
| 175 | } |
| 176 | |
| 177 | // convert the given file name into a process id. if the file |
| 178 | // does not meet the file naming constraints, return 0. |
| 179 | // |
| 180 | static pid_t filename_to_pid(const char* filename) { |
| 181 | |
| 182 | // a filename that doesn't begin with a digit is not a |
| 183 | // candidate for conversion. |
| 184 | // |
| 185 | if (!isdigit(*filename)) { |
| 186 | return 0; |
| 187 | } |
| 188 | |
| 189 | // check if file name can be converted to an integer without |
| 190 | // any leftover characters. |
| 191 | // |
| 192 | char* remainder = NULL__null; |
| 193 | errno(*__errno_location ()) = 0; |
| 194 | pid_t pid = (pid_t)strtol(filename, &remainder, 10); |
| 195 | |
| 196 | if (errno(*__errno_location ()) != 0) { |
| 197 | return 0; |
| 198 | } |
| 199 | |
| 200 | // check for left over characters. If any, then the filename is |
| 201 | // not a candidate for conversion. |
| 202 | // |
| 203 | if (remainder != NULL__null && *remainder != '\0') { |
| 204 | return 0; |
| 205 | } |
| 206 | |
| 207 | // successful conversion, return the pid |
| 208 | return pid; |
| 209 | } |
| 210 | |
| 211 | |
| 212 | // Check if the given statbuf is considered a secure directory for |
| 213 | // the backing store files. Returns true if the directory is considered |
| 214 | // a secure location. Returns false if the statbuf is a symbolic link or |
| 215 | // if an error occurred. |
| 216 | // |
| 217 | static bool is_statbuf_secure(struct stat *statp) { |
| 218 | if (S_ISLNK(statp->st_mode)((((statp->st_mode)) & 0170000) == (0120000)) || !S_ISDIR(statp->st_mode)((((statp->st_mode)) & 0170000) == (0040000))) { |
| 219 | // The path represents a link or some non-directory file type, |
| 220 | // which is not what we expected. Declare it insecure. |
| 221 | // |
| 222 | return false; |
| 223 | } |
| 224 | // We have an existing directory, check if the permissions are safe. |
| 225 | // |
| 226 | if ((statp->st_mode & (S_IWGRP(0200 >> 3)|S_IWOTH((0200 >> 3) >> 3))) != 0) { |
| 227 | // The directory is open for writing and could be subjected |
| 228 | // to a symlink or a hard link attack. Declare it insecure. |
| 229 | // |
| 230 | return false; |
| 231 | } |
| 232 | // If user is not root then see if the uid of the directory matches the effective uid of the process. |
| 233 | uid_t euid = geteuid(); |
| 234 | if ((euid != 0) && (statp->st_uid != euid)) { |
| 235 | // The directory was not created by this user, declare it insecure. |
| 236 | // |
| 237 | return false; |
| 238 | } |
| 239 | return true; |
| 240 | } |
| 241 | |
| 242 | |
| 243 | // Check if the given path is considered a secure directory for |
| 244 | // the backing store files. Returns true if the directory exists |
| 245 | // and is considered a secure location. Returns false if the path |
| 246 | // is a symbolic link or if an error occurred. |
| 247 | // |
| 248 | static bool is_directory_secure(const char* path) { |
| 249 | struct stat statbuf; |
| 250 | int result = 0; |
| 251 | |
| 252 | RESTARTABLE(::lstat(path, &statbuf), result)do { result = ::lstat(path, &statbuf); } while(((int)result == OS_ERR) && ((*__errno_location ()) == 4)); |
| 253 | if (result == OS_ERR) { |
| 254 | return false; |
| 255 | } |
| 256 | |
| 257 | // The path exists, see if it is secure. |
| 258 | return is_statbuf_secure(&statbuf); |
| 259 | } |
| 260 | |
| 261 | |
| 262 | // Check if the given directory file descriptor is considered a secure |
| 263 | // directory for the backing store files. Returns true if the directory |
| 264 | // exists and is considered a secure location. Returns false if the path |
| 265 | // is a symbolic link or if an error occurred. |
| 266 | // |
| 267 | static bool is_dirfd_secure(int dir_fd) { |
| 268 | struct stat statbuf; |
| 269 | int result = 0; |
| 270 | |
| 271 | RESTARTABLE(::fstat(dir_fd, &statbuf), result)do { result = ::fstat(dir_fd, &statbuf); } while(((int)result == OS_ERR) && ((*__errno_location ()) == 4)); |
| 272 | if (result == OS_ERR) { |
| 273 | return false; |
| 274 | } |
| 275 | |
| 276 | // The path exists, now check its mode. |
| 277 | return is_statbuf_secure(&statbuf); |
| 278 | } |
| 279 | |
| 280 | |
| 281 | // Check to make sure fd1 and fd2 are referencing the same file system object. |
| 282 | // |
| 283 | static bool is_same_fsobject(int fd1, int fd2) { |
| 284 | struct stat statbuf1; |
| 285 | struct stat statbuf2; |
| 286 | int result = 0; |
| 287 | |
| 288 | RESTARTABLE(::fstat(fd1, &statbuf1), result)do { result = ::fstat(fd1, &statbuf1); } while(((int)result == OS_ERR) && ((*__errno_location ()) == 4)); |
| 289 | if (result == OS_ERR) { |
| 290 | return false; |
| 291 | } |
| 292 | RESTARTABLE(::fstat(fd2, &statbuf2), result)do { result = ::fstat(fd2, &statbuf2); } while(((int)result == OS_ERR) && ((*__errno_location ()) == 4)); |
| 293 | if (result == OS_ERR) { |
| 294 | return false; |
| 295 | } |
| 296 | |
| 297 | if ((statbuf1.st_ino == statbuf2.st_ino) && |
| 298 | (statbuf1.st_dev == statbuf2.st_dev)) { |
| 299 | return true; |
| 300 | } else { |
| 301 | return false; |
| 302 | } |
| 303 | } |
| 304 | |
| 305 | |
| 306 | // Open the directory of the given path and validate it. |
| 307 | // Return a DIR * of the open directory. |
| 308 | // |
| 309 | static DIR *open_directory_secure(const char* dirname) { |
| 310 | // Open the directory using open() so that it can be verified |
| 311 | // to be secure by calling is_dirfd_secure(), opendir() and then check |
| 312 | // to see if they are the same file system object. This method does not |
| 313 | // introduce a window of opportunity for the directory to be attacked that |
| 314 | // calling opendir() and is_directory_secure() does. |
| 315 | int result; |
| 316 | DIR *dirp = NULL__null; |
| 317 | RESTARTABLE(::open(dirname, O_RDONLY|O_NOFOLLOW), result)do { result = ::open(dirname, 00|0400000); } while(((int)result == OS_ERR) && ((*__errno_location ()) == 4)); |
| 318 | if (result == OS_ERR) { |
| 319 | // Directory doesn't exist or is a symlink, so there is nothing to cleanup. |
| 320 | if (PrintMiscellaneous && Verbose) { |
| 321 | if (errno(*__errno_location ()) == ELOOP40) { |
| 322 | warning("directory %s is a symlink and is not secure\n", dirname); |
| 323 | } else { |
| 324 | warning("could not open directory %s: %s\n", dirname, os::strerror(errno(*__errno_location ()))); |
| 325 | } |
| 326 | } |
| 327 | return dirp; |
| 328 | } |
| 329 | int fd = result; |
| 330 | |
| 331 | // Determine if the open directory is secure. |
| 332 | if (!is_dirfd_secure(fd)) { |
| 333 | // The directory is not a secure directory. |
| 334 | os::close(fd); |
| 335 | return dirp; |
| 336 | } |
| 337 | |
| 338 | // Open the directory. |
| 339 | dirp = ::opendir(dirname); |
| 340 | if (dirp == NULL__null) { |
| 341 | // The directory doesn't exist, close fd and return. |
| 342 | os::close(fd); |
| 343 | return dirp; |
| 344 | } |
| 345 | |
| 346 | // Check to make sure fd and dirp are referencing the same file system object. |
| 347 | if (!is_same_fsobject(fd, AIX_ONLY(dirp->dd_fd) NOT_AIX(dirfd(dirp))dirfd(dirp))) { |
| 348 | // The directory is not secure. |
| 349 | os::close(fd); |
| 350 | os::closedir(dirp); |
| 351 | dirp = NULL__null; |
| 352 | return dirp; |
| 353 | } |
| 354 | |
| 355 | // Close initial open now that we know directory is secure |
| 356 | os::close(fd); |
| 357 | |
| 358 | return dirp; |
| 359 | } |
| 360 | |
| 361 | // NOTE: The code below uses fchdir(), open() and unlink() because |
| 362 | // fdopendir(), openat() and unlinkat() are not supported on all |
| 363 | // versions. Once the support for fdopendir(), openat() and unlinkat() |
| 364 | // is available on all supported versions the code can be changed |
| 365 | // to use these functions. |
| 366 | |
| 367 | // Open the directory of the given path, validate it and set the |
| 368 | // current working directory to it. |
| 369 | // Return a DIR * of the open directory and the saved cwd fd. |
| 370 | // |
| 371 | static DIR *open_directory_secure_cwd(const char* dirname, int *saved_cwd_fd) { |
| 372 | |
| 373 | // Open the directory. |
| 374 | DIR* dirp = open_directory_secure(dirname); |
| 375 | if (dirp == NULL__null) { |
| 376 | // Directory doesn't exist or is insecure, so there is nothing to cleanup. |
| 377 | return dirp; |
| 378 | } |
| 379 | int fd = AIX_ONLY(dirp->dd_fd) NOT_AIX(dirfd(dirp))dirfd(dirp); |
| 380 | |
| 381 | // Open a fd to the cwd and save it off. |
| 382 | int result; |
| 383 | RESTARTABLE(::open(".", O_RDONLY), result)do { result = ::open(".", 00); } while(((int)result == OS_ERR ) && ((*__errno_location ()) == 4)); |
| 384 | if (result == OS_ERR) { |
| 385 | *saved_cwd_fd = -1; |
| 386 | } else { |
| 387 | *saved_cwd_fd = result; |
| 388 | } |
| 389 | |
| 390 | // Set the current directory to dirname by using the fd of the directory and |
| 391 | // handle errors, otherwise shared memory files will be created in cwd. |
| 392 | result = fchdir(fd); |
| 393 | if (result == OS_ERR) { |
| 394 | if (PrintMiscellaneous && Verbose) { |
| 395 | warning("could not change to directory %s", dirname); |
| 396 | } |
| 397 | if (*saved_cwd_fd != -1) { |
| 398 | ::close(*saved_cwd_fd); |
| 399 | *saved_cwd_fd = -1; |
| 400 | } |
| 401 | // Close the directory. |
| 402 | os::closedir(dirp); |
| 403 | return NULL__null; |
| 404 | } else { |
| 405 | return dirp; |
| 406 | } |
| 407 | } |
| 408 | |
| 409 | // Close the directory and restore the current working directory. |
| 410 | // |
| 411 | static void close_directory_secure_cwd(DIR* dirp, int saved_cwd_fd) { |
| 412 | |
| 413 | int result; |
| 414 | // If we have a saved cwd change back to it and close the fd. |
| 415 | if (saved_cwd_fd != -1) { |
| 416 | result = fchdir(saved_cwd_fd); |
Value stored to 'result' is never read | |
| 417 | ::close(saved_cwd_fd); |
| 418 | } |
| 419 | |
| 420 | // Close the directory. |
| 421 | os::closedir(dirp); |
| 422 | } |
| 423 | |
| 424 | // Check if the given file descriptor is considered a secure. |
| 425 | // |
| 426 | static bool is_file_secure(int fd, const char *filename) { |
| 427 | |
| 428 | int result; |
| 429 | struct stat statbuf; |
| 430 | |
| 431 | // Determine if the file is secure. |
| 432 | RESTARTABLE(::fstat(fd, &statbuf), result)do { result = ::fstat(fd, &statbuf); } while(((int)result == OS_ERR) && ((*__errno_location ()) == 4)); |
| 433 | if (result == OS_ERR) { |
| 434 | if (PrintMiscellaneous && Verbose) { |
| 435 | warning("fstat failed on %s: %s\n", filename, os::strerror(errno(*__errno_location ()))); |
| 436 | } |
| 437 | return false; |
| 438 | } |
| 439 | if (statbuf.st_nlink > 1) { |
| 440 | // A file with multiple links is not expected. |
| 441 | if (PrintMiscellaneous && Verbose) { |
| 442 | warning("file %s has multiple links\n", filename); |
| 443 | } |
| 444 | return false; |
| 445 | } |
| 446 | return true; |
| 447 | } |
| 448 | |
| 449 | |
| 450 | // return the user name for the given user id |
| 451 | // |
| 452 | // the caller is expected to free the allocated memory. |
| 453 | // |
| 454 | static char* get_user_name(uid_t uid) { |
| 455 | |
| 456 | struct passwd pwent; |
| 457 | |
| 458 | // Determine the max pwbuf size from sysconf, and hardcode |
| 459 | // a default if this not available through sysconf. |
| 460 | long bufsize = sysconf(_SC_GETPW_R_SIZE_MAX_SC_GETPW_R_SIZE_MAX); |
| 461 | if (bufsize == -1) |
| 462 | bufsize = 1024; |
| 463 | |
| 464 | char* pwbuf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal)(char*) (AllocateHeap((bufsize) * sizeof(char), mtInternal)); |
| 465 | |
| 466 | struct passwd* p = NULL__null; |
| 467 | int result = getpwuid_r(uid, &pwent, pwbuf, (size_t)bufsize, &p); |
| 468 | |
| 469 | if (result != 0 || p == NULL__null || p->pw_name == NULL__null || *(p->pw_name) == '\0') { |
| 470 | if (PrintMiscellaneous && Verbose) { |
| 471 | if (result != 0) { |
| 472 | warning("Could not retrieve passwd entry: %s\n", |
| 473 | os::strerror(result)); |
| 474 | } |
| 475 | else if (p == NULL__null) { |
| 476 | // this check is added to protect against an observed problem |
| 477 | // with getpwuid_r() on RedHat 9 where getpwuid_r returns 0, |
| 478 | // indicating success, but has p == NULL. This was observed when |
| 479 | // inserting a file descriptor exhaustion fault prior to the call |
| 480 | // getpwuid_r() call. In this case, error is set to the appropriate |
| 481 | // error condition, but this is undocumented behavior. This check |
| 482 | // is safe under any condition, but the use of errno in the output |
| 483 | // message may result in an erroneous message. |
| 484 | // Bug Id 89052 was opened with RedHat. |
| 485 | // |
| 486 | warning("Could not retrieve passwd entry: %s\n", |
| 487 | os::strerror(errno(*__errno_location ()))); |
| 488 | } |
| 489 | else { |
| 490 | warning("Could not determine user name: %s\n", |
| 491 | p->pw_name == NULL__null ? "pw_name = NULL" : |
| 492 | "pw_name zero length"); |
| 493 | } |
| 494 | } |
| 495 | FREE_C_HEAP_ARRAY(char, pwbuf)FreeHeap((char*)(pwbuf)); |
| 496 | return NULL__null; |
| 497 | } |
| 498 | |
| 499 | char* user_name = NEW_C_HEAP_ARRAY(char, strlen(p->pw_name) + 1, mtInternal)(char*) (AllocateHeap((strlen(p->pw_name) + 1) * sizeof(char ), mtInternal)); |
| 500 | strcpy(user_name, p->pw_name); |
| 501 | |
| 502 | FREE_C_HEAP_ARRAY(char, pwbuf)FreeHeap((char*)(pwbuf)); |
| 503 | return user_name; |
| 504 | } |
| 505 | |
| 506 | // return the name of the user that owns the process identified by vmid. |
| 507 | // |
| 508 | // This method uses a slow directory search algorithm to find the backing |
| 509 | // store file for the specified vmid and returns the user name, as determined |
| 510 | // by the user name suffix of the hsperfdata_<username> directory name. |
| 511 | // |
| 512 | // the caller is expected to free the allocated memory. |
| 513 | // |
| 514 | // |
| 515 | static char* get_user_name_slow(int vmid, int nspid, TRAPSJavaThread* __the_thread__) { |
| 516 | |
| 517 | // short circuit the directory search if the process doesn't even exist. |
| 518 | if (kill(vmid, 0) == OS_ERR) { |
| 519 | if (errno(*__errno_location ()) == ESRCH3) { |
| 520 | THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),{ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 521, vmSymbols::java_lang_IllegalArgumentException(), "Process not found" ); return 0; } |
| 521 | "Process not found"){ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 521, vmSymbols::java_lang_IllegalArgumentException(), "Process not found" ); return 0; }; |
| 522 | } |
| 523 | else /* EPERM */ { |
| 524 | THROW_MSG_0(vmSymbols::java_io_IOException(), os::strerror(errno)){ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 524, vmSymbols::java_io_IOException(), os::strerror((*__errno_location ()))); return 0; }; |
| 525 | } |
| 526 | } |
| 527 | |
| 528 | // directory search |
| 529 | char* oldest_user = NULL__null; |
| 530 | time_t oldest_ctime = 0; |
| 531 | int searchpid; |
| 532 | char* tmpdirname = (char *)os::get_temp_directory(); |
| 533 | #if defined(LINUX1) |
| 534 | char buffer[MAXPATHLEN4096 + 1]; |
| 535 | assert(strlen(tmpdirname) == 4, "No longer using /tmp - update buffer size")do { if (!(strlen(tmpdirname) == 4)) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 535, "assert(" "strlen(tmpdirname) == 4" ") failed", "No longer using /tmp - update buffer size" ); ::breakpoint(); } } while (0); |
| 536 | |
| 537 | // On Linux, if nspid != -1, look in /proc/{vmid}/root/tmp for directories |
| 538 | // containing nspid, otherwise just look for vmid in /tmp. |
| 539 | if (nspid == -1) { |
| 540 | searchpid = vmid; |
| 541 | } else { |
| 542 | jio_snprintf(buffer, MAXPATHLEN4096, "/proc/%d/root%s", vmid, tmpdirname); |
| 543 | tmpdirname = buffer; |
| 544 | searchpid = nspid; |
| 545 | } |
| 546 | #else |
| 547 | searchpid = vmid; |
| 548 | #endif |
| 549 | |
| 550 | // open the temp directory |
| 551 | DIR* tmpdirp = os::opendir(tmpdirname); |
| 552 | |
| 553 | if (tmpdirp == NULL__null) { |
| 554 | // Cannot open the directory to get the user name, return. |
| 555 | return NULL__null; |
| 556 | } |
| 557 | |
| 558 | // for each entry in the directory that matches the pattern hsperfdata_*, |
| 559 | // open the directory and check if the file for the given vmid (or nspid) exists. |
| 560 | // The file with the expected name and the latest creation date is used |
| 561 | // to determine the user name for the process id. |
| 562 | // |
| 563 | struct dirent* dentry; |
| 564 | errno(*__errno_location ()) = 0; |
| 565 | while ((dentry = os::readdir(tmpdirp)) != NULL__null) { |
| 566 | |
| 567 | // check if the directory entry is a hsperfdata file |
| 568 | if (strncmp(dentry->d_name, PERFDATA_NAME, strlen(PERFDATA_NAME)) != 0) { |
| 569 | continue; |
| 570 | } |
| 571 | |
| 572 | char* usrdir_name = NEW_C_HEAP_ARRAY(char,(char*) (AllocateHeap((strlen(tmpdirname) + strlen(dentry-> d_name) + 2) * sizeof(char), mtInternal)) |
| 573 | strlen(tmpdirname) + strlen(dentry->d_name) + 2,(char*) (AllocateHeap((strlen(tmpdirname) + strlen(dentry-> d_name) + 2) * sizeof(char), mtInternal)) |
| 574 | mtInternal)(char*) (AllocateHeap((strlen(tmpdirname) + strlen(dentry-> d_name) + 2) * sizeof(char), mtInternal)); |
| 575 | strcpy(usrdir_name, tmpdirname); |
| 576 | strcat(usrdir_name, "/"); |
| 577 | strcat(usrdir_name, dentry->d_name); |
| 578 | |
| 579 | // open the user directory |
| 580 | DIR* subdirp = open_directory_secure(usrdir_name); |
| 581 | |
| 582 | if (subdirp == NULL__null) { |
| 583 | FREE_C_HEAP_ARRAY(char, usrdir_name)FreeHeap((char*)(usrdir_name)); |
| 584 | continue; |
| 585 | } |
| 586 | |
| 587 | // Since we don't create the backing store files in directories |
| 588 | // pointed to by symbolic links, we also don't follow them when |
| 589 | // looking for the files. We check for a symbolic link after the |
| 590 | // call to opendir in order to eliminate a small window where the |
| 591 | // symlink can be exploited. |
| 592 | // |
| 593 | if (!is_directory_secure(usrdir_name)) { |
| 594 | FREE_C_HEAP_ARRAY(char, usrdir_name)FreeHeap((char*)(usrdir_name)); |
| 595 | os::closedir(subdirp); |
| 596 | continue; |
| 597 | } |
| 598 | |
| 599 | struct dirent* udentry; |
| 600 | errno(*__errno_location ()) = 0; |
| 601 | while ((udentry = os::readdir(subdirp)) != NULL__null) { |
| 602 | |
| 603 | if (filename_to_pid(udentry->d_name) == searchpid) { |
| 604 | struct stat statbuf; |
| 605 | int result; |
| 606 | |
| 607 | char* filename = NEW_C_HEAP_ARRAY(char,(char*) (AllocateHeap((strlen(usrdir_name) + strlen(udentry-> d_name) + 2) * sizeof(char), mtInternal)) |
| 608 | strlen(usrdir_name) + strlen(udentry->d_name) + 2,(char*) (AllocateHeap((strlen(usrdir_name) + strlen(udentry-> d_name) + 2) * sizeof(char), mtInternal)) |
| 609 | mtInternal)(char*) (AllocateHeap((strlen(usrdir_name) + strlen(udentry-> d_name) + 2) * sizeof(char), mtInternal)); |
| 610 | |
| 611 | strcpy(filename, usrdir_name); |
| 612 | strcat(filename, "/"); |
| 613 | strcat(filename, udentry->d_name); |
| 614 | |
| 615 | // don't follow symbolic links for the file |
| 616 | RESTARTABLE(::lstat(filename, &statbuf), result)do { result = ::lstat(filename, &statbuf); } while(((int) result == OS_ERR) && ((*__errno_location ()) == 4)); |
| 617 | if (result == OS_ERR) { |
| 618 | FREE_C_HEAP_ARRAY(char, filename)FreeHeap((char*)(filename)); |
| 619 | continue; |
| 620 | } |
| 621 | |
| 622 | // skip over files that are not regular files. |
| 623 | if (!S_ISREG(statbuf.st_mode)((((statbuf.st_mode)) & 0170000) == (0100000))) { |
| 624 | FREE_C_HEAP_ARRAY(char, filename)FreeHeap((char*)(filename)); |
| 625 | continue; |
| 626 | } |
| 627 | |
| 628 | // compare and save filename with latest creation time |
| 629 | if (statbuf.st_size > 0 && statbuf.st_ctimest_ctim.tv_sec > oldest_ctime) { |
| 630 | |
| 631 | if (statbuf.st_ctimest_ctim.tv_sec > oldest_ctime) { |
| 632 | char* user = strchr(dentry->d_name, '_') + 1; |
| 633 | |
| 634 | FREE_C_HEAP_ARRAY(char, oldest_user)FreeHeap((char*)(oldest_user)); |
| 635 | oldest_user = NEW_C_HEAP_ARRAY(char, strlen(user)+1, mtInternal)(char*) (AllocateHeap((strlen(user)+1) * sizeof(char), mtInternal )); |
| 636 | |
| 637 | strcpy(oldest_user, user); |
| 638 | oldest_ctime = statbuf.st_ctimest_ctim.tv_sec; |
| 639 | } |
| 640 | } |
| 641 | |
| 642 | FREE_C_HEAP_ARRAY(char, filename)FreeHeap((char*)(filename)); |
| 643 | } |
| 644 | } |
| 645 | os::closedir(subdirp); |
| 646 | FREE_C_HEAP_ARRAY(char, usrdir_name)FreeHeap((char*)(usrdir_name)); |
| 647 | } |
| 648 | os::closedir(tmpdirp); |
| 649 | |
| 650 | return(oldest_user); |
| 651 | } |
| 652 | |
| 653 | // return the name of the user that owns the JVM indicated by the given vmid. |
| 654 | // |
| 655 | static char* get_user_name(int vmid, int *nspid, TRAPSJavaThread* __the_thread__) { |
| 656 | char *result = get_user_name_slow(vmid, *nspid, THREAD__the_thread__); |
| 657 | |
| 658 | #if defined(LINUX1) |
| 659 | // If we are examining a container process without PID namespaces enabled |
| 660 | // we need to use /proc/{pid}/root/tmp to find hsperfdata files. |
| 661 | if (result == NULL__null) { |
| 662 | result = get_user_name_slow(vmid, vmid, THREAD__the_thread__); |
| 663 | // Enable nspid logic going forward |
| 664 | if (result != NULL__null) *nspid = vmid; |
| 665 | } |
| 666 | #endif |
| 667 | return result; |
| 668 | } |
| 669 | |
| 670 | // return the file name of the backing store file for the named |
| 671 | // shared memory region for the given user name and vmid. |
| 672 | // |
| 673 | // the caller is expected to free the allocated memory. |
| 674 | // |
| 675 | static char* get_sharedmem_filename(const char* dirname, int vmid, int nspid) { |
| 676 | |
| 677 | int pid = LINUX_ONLY((nspid == -1) ? vmid : nspid)(nspid == -1) ? vmid : nspid NOT_LINUX(vmid); |
| 678 | |
| 679 | // add 2 for the file separator and a null terminator. |
| 680 | size_t nbytes = strlen(dirname) + UINT_CHARS + 2; |
| 681 | |
| 682 | char* name = NEW_C_HEAP_ARRAY(char, nbytes, mtInternal)(char*) (AllocateHeap((nbytes) * sizeof(char), mtInternal)); |
| 683 | snprintf(name, nbytes, "%s/%d", dirname, pid); |
| 684 | |
| 685 | return name; |
| 686 | } |
| 687 | |
| 688 | |
| 689 | // remove file |
| 690 | // |
| 691 | // this method removes the file specified by the given path |
| 692 | // |
| 693 | static void remove_file(const char* path) { |
| 694 | |
| 695 | int result; |
| 696 | |
| 697 | // if the file is a directory, the following unlink will fail. since |
| 698 | // we don't expect to find directories in the user temp directory, we |
| 699 | // won't try to handle this situation. even if accidentially or |
| 700 | // maliciously planted, the directory's presence won't hurt anything. |
| 701 | // |
| 702 | RESTARTABLE(::unlink(path), result)do { result = ::unlink(path); } while(((int)result == OS_ERR) && ((*__errno_location ()) == 4)); |
| 703 | if (PrintMiscellaneous && Verbose && result == OS_ERR) { |
| 704 | if (errno(*__errno_location ()) != ENOENT2) { |
| 705 | warning("Could not unlink shared memory backing" |
| 706 | " store file %s : %s\n", path, os::strerror(errno(*__errno_location ()))); |
| 707 | } |
| 708 | } |
| 709 | } |
| 710 | |
| 711 | |
| 712 | // cleanup stale shared memory resources |
| 713 | // |
| 714 | // This method attempts to remove all stale shared memory files in |
| 715 | // the named user temporary directory. It scans the named directory |
| 716 | // for files matching the pattern ^$[0-9]*$. For each file found, the |
| 717 | // process id is extracted from the file name and a test is run to |
| 718 | // determine if the process is alive. If the process is not alive, |
| 719 | // any stale file resources are removed. |
| 720 | // |
| 721 | static void cleanup_sharedmem_resources(const char* dirname) { |
| 722 | |
| 723 | int saved_cwd_fd; |
| 724 | // open the directory and set the current working directory to it |
| 725 | DIR* dirp = open_directory_secure_cwd(dirname, &saved_cwd_fd); |
| 726 | if (dirp == NULL__null) { |
| 727 | // directory doesn't exist or is insecure, so there is nothing to cleanup |
| 728 | return; |
| 729 | } |
| 730 | |
| 731 | // for each entry in the directory that matches the expected file |
| 732 | // name pattern, determine if the file resources are stale and if |
| 733 | // so, remove the file resources. Note, instrumented HotSpot processes |
| 734 | // for this user may start and/or terminate during this search and |
| 735 | // remove or create new files in this directory. The behavior of this |
| 736 | // loop under these conditions is dependent upon the implementation of |
| 737 | // opendir/readdir. |
| 738 | // |
| 739 | struct dirent* entry; |
| 740 | errno(*__errno_location ()) = 0; |
| 741 | while ((entry = os::readdir(dirp)) != NULL__null) { |
| 742 | |
| 743 | pid_t pid = filename_to_pid(entry->d_name); |
| 744 | |
| 745 | if (pid == 0) { |
| 746 | |
| 747 | if (strcmp(entry->d_name, ".") != 0 && strcmp(entry->d_name, "..") != 0) { |
| 748 | // attempt to remove all unexpected files, except "." and ".." |
| 749 | unlink(entry->d_name); |
| 750 | } |
| 751 | |
| 752 | errno(*__errno_location ()) = 0; |
| 753 | continue; |
| 754 | } |
| 755 | |
| 756 | // we now have a file name that converts to a valid integer |
| 757 | // that could represent a process id . if this process id |
| 758 | // matches the current process id or the process is not running, |
| 759 | // then remove the stale file resources. |
| 760 | // |
| 761 | // process liveness is detected by sending signal number 0 to |
| 762 | // the process id (see kill(2)). if kill determines that the |
| 763 | // process does not exist, then the file resources are removed. |
| 764 | // if kill determines that that we don't have permission to |
| 765 | // signal the process, then the file resources are assumed to |
| 766 | // be stale and are removed because the resources for such a |
| 767 | // process should be in a different user specific directory. |
| 768 | // |
| 769 | if ((pid == os::current_process_id()) || |
| 770 | (kill(pid, 0) == OS_ERR && (errno(*__errno_location ()) == ESRCH3 || errno(*__errno_location ()) == EPERM1))) { |
| 771 | unlink(entry->d_name); |
| 772 | } |
| 773 | errno(*__errno_location ()) = 0; |
| 774 | } |
| 775 | |
| 776 | // close the directory and reset the current working directory |
| 777 | close_directory_secure_cwd(dirp, saved_cwd_fd); |
| 778 | } |
| 779 | |
| 780 | // make the user specific temporary directory. Returns true if |
| 781 | // the directory exists and is secure upon return. Returns false |
| 782 | // if the directory exists but is either a symlink, is otherwise |
| 783 | // insecure, or if an error occurred. |
| 784 | // |
| 785 | static bool make_user_tmp_dir(const char* dirname) { |
| 786 | |
| 787 | // create the directory with 0755 permissions. note that the directory |
| 788 | // will be owned by euid::egid, which may not be the same as uid::gid. |
| 789 | // |
| 790 | if (mkdir(dirname, S_IRWXU(0400|0200|0100)|S_IRGRP(0400 >> 3)|S_IXGRP(0100 >> 3)|S_IROTH((0400 >> 3) >> 3)|S_IXOTH((0100 >> 3) >> 3)) == OS_ERR) { |
| 791 | if (errno(*__errno_location ()) == EEXIST17) { |
| 792 | // The directory already exists and was probably created by another |
| 793 | // JVM instance. However, this could also be the result of a |
| 794 | // deliberate symlink. Verify that the existing directory is safe. |
| 795 | // |
| 796 | if (!is_directory_secure(dirname)) { |
| 797 | // directory is not secure |
| 798 | if (PrintMiscellaneous && Verbose) { |
| 799 | warning("%s directory is insecure\n", dirname); |
| 800 | } |
| 801 | return false; |
| 802 | } |
| 803 | } |
| 804 | else { |
| 805 | // we encountered some other failure while attempting |
| 806 | // to create the directory |
| 807 | // |
| 808 | if (PrintMiscellaneous && Verbose) { |
| 809 | warning("could not create directory %s: %s\n", |
| 810 | dirname, os::strerror(errno(*__errno_location ()))); |
| 811 | } |
| 812 | return false; |
| 813 | } |
| 814 | } |
| 815 | return true; |
| 816 | } |
| 817 | |
| 818 | // create the shared memory file resources |
| 819 | // |
| 820 | // This method creates the shared memory file with the given size |
| 821 | // This method also creates the user specific temporary directory, if |
| 822 | // it does not yet exist. |
| 823 | // |
| 824 | static int create_sharedmem_resources(const char* dirname, const char* filename, size_t size) { |
| 825 | |
| 826 | // make the user temporary directory |
| 827 | if (!make_user_tmp_dir(dirname)) { |
| 828 | // could not make/find the directory or the found directory |
| 829 | // was not secure |
| 830 | return -1; |
| 831 | } |
| 832 | |
| 833 | int saved_cwd_fd; |
| 834 | // open the directory and set the current working directory to it |
| 835 | DIR* dirp = open_directory_secure_cwd(dirname, &saved_cwd_fd); |
| 836 | if (dirp == NULL__null) { |
| 837 | // Directory doesn't exist or is insecure, so cannot create shared |
| 838 | // memory file. |
| 839 | return -1; |
| 840 | } |
| 841 | |
| 842 | // Open the filename in the current directory. |
| 843 | // Cannot use O_TRUNC here; truncation of an existing file has to happen |
| 844 | // after the is_file_secure() check below. |
| 845 | int result; |
| 846 | RESTARTABLE(os::open(filename, O_RDWR|O_CREAT|O_NOFOLLOW, S_IRUSR|S_IWUSR), result)do { result = os::open(filename, 02|0100|0400000, 0400|0200); } while(((int)result == OS_ERR) && ((*__errno_location ()) == 4)); |
| 847 | if (result == OS_ERR) { |
| 848 | if (PrintMiscellaneous && Verbose) { |
| 849 | if (errno(*__errno_location ()) == ELOOP40) { |
| 850 | warning("file %s is a symlink and is not secure\n", filename); |
| 851 | } else { |
| 852 | warning("could not create file %s: %s\n", filename, os::strerror(errno(*__errno_location ()))); |
| 853 | } |
| 854 | } |
| 855 | // close the directory and reset the current working directory |
| 856 | close_directory_secure_cwd(dirp, saved_cwd_fd); |
| 857 | |
| 858 | return -1; |
| 859 | } |
| 860 | // close the directory and reset the current working directory |
| 861 | close_directory_secure_cwd(dirp, saved_cwd_fd); |
| 862 | |
| 863 | // save the file descriptor |
| 864 | int fd = result; |
| 865 | |
| 866 | // check to see if the file is secure |
| 867 | if (!is_file_secure(fd, filename)) { |
| 868 | ::close(fd); |
| 869 | return -1; |
| 870 | } |
| 871 | |
| 872 | // truncate the file to get rid of any existing data |
| 873 | RESTARTABLE(::ftruncate(fd, (off_t)0), result)do { result = ::ftruncate(fd, (off_t)0); } while(((int)result == OS_ERR) && ((*__errno_location ()) == 4)); |
| 874 | if (result == OS_ERR) { |
| 875 | if (PrintMiscellaneous && Verbose) { |
| 876 | warning("could not truncate shared memory file: %s\n", os::strerror(errno(*__errno_location ()))); |
| 877 | } |
| 878 | ::close(fd); |
| 879 | return -1; |
| 880 | } |
| 881 | // set the file size |
| 882 | RESTARTABLE(::ftruncate(fd, (off_t)size), result)do { result = ::ftruncate(fd, (off_t)size); } while(((int)result == OS_ERR) && ((*__errno_location ()) == 4)); |
| 883 | if (result == OS_ERR) { |
| 884 | if (PrintMiscellaneous && Verbose) { |
| 885 | warning("could not set shared memory file size: %s\n", os::strerror(errno(*__errno_location ()))); |
| 886 | } |
| 887 | ::close(fd); |
| 888 | return -1; |
| 889 | } |
| 890 | |
| 891 | // Verify that we have enough disk space for this file. |
| 892 | // We'll get random SIGBUS crashes on memory accesses if |
| 893 | // we don't. |
| 894 | for (size_t seekpos = 0; seekpos < size; seekpos += os::vm_page_size()) { |
| 895 | int zero_int = 0; |
| 896 | result = (int)os::seek_to_file_offset(fd, (jlong)(seekpos)); |
| 897 | if (result == -1 ) break; |
| 898 | RESTARTABLE(::write(fd, &zero_int, 1), result)do { result = ::write(fd, &zero_int, 1); } while(((int)result == OS_ERR) && ((*__errno_location ()) == 4)); |
| 899 | if (result != 1) { |
| 900 | if (errno(*__errno_location ()) == ENOSPC28) { |
| 901 | warning("Insufficient space for shared memory file:\n %s\nTry using the -Djava.io.tmpdir= option to select an alternate temp location.\n", filename); |
| 902 | } |
| 903 | break; |
| 904 | } |
| 905 | } |
| 906 | |
| 907 | if (result != -1) { |
| 908 | return fd; |
| 909 | } else { |
| 910 | ::close(fd); |
| 911 | return -1; |
| 912 | } |
| 913 | } |
| 914 | |
| 915 | // open the shared memory file for the given user and vmid. returns |
| 916 | // the file descriptor for the open file or -1 if the file could not |
| 917 | // be opened. |
| 918 | // |
| 919 | static int open_sharedmem_file(const char* filename, int oflags, TRAPSJavaThread* __the_thread__) { |
| 920 | |
| 921 | // open the file |
| 922 | int result; |
| 923 | RESTARTABLE(os::open(filename, oflags, 0), result)do { result = os::open(filename, oflags, 0); } while(((int)result == OS_ERR) && ((*__errno_location ()) == 4)); |
| 924 | if (result == OS_ERR) { |
| 925 | if (errno(*__errno_location ()) == ENOENT2) { |
| 926 | THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),{ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 927, vmSymbols::java_lang_IllegalArgumentException(), "Process not found" ); return OS_ERR; } |
| 927 | "Process not found", OS_ERR){ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 927, vmSymbols::java_lang_IllegalArgumentException(), "Process not found" ); return OS_ERR; }; |
| 928 | } |
| 929 | else if (errno(*__errno_location ()) == EACCES13) { |
| 930 | THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),{ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 931, vmSymbols::java_lang_IllegalArgumentException(), "Permission denied" ); return OS_ERR; } |
| 931 | "Permission denied", OS_ERR){ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 931, vmSymbols::java_lang_IllegalArgumentException(), "Permission denied" ); return OS_ERR; }; |
| 932 | } |
| 933 | else { |
| 934 | THROW_MSG_(vmSymbols::java_io_IOException(),{ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 935, vmSymbols::java_io_IOException(), os::strerror((*__errno_location ()))); return OS_ERR; } |
| 935 | os::strerror(errno), OS_ERR){ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 935, vmSymbols::java_io_IOException(), os::strerror((*__errno_location ()))); return OS_ERR; }; |
| 936 | } |
| 937 | } |
| 938 | int fd = result; |
| 939 | |
| 940 | // check to see if the file is secure |
| 941 | if (!is_file_secure(fd, filename)) { |
| 942 | ::close(fd); |
| 943 | return -1; |
| 944 | } |
| 945 | |
| 946 | return fd; |
| 947 | } |
| 948 | |
| 949 | // create a named shared memory region. returns the address of the |
| 950 | // memory region on success or NULL on failure. A return value of |
| 951 | // NULL will ultimately disable the shared memory feature. |
| 952 | // |
| 953 | // The name space for shared memory objects is the file system name space. |
| 954 | // |
| 955 | // A monitoring application attaching to a JVM does not need to know |
| 956 | // the file system name of the shared memory object. However, it may |
| 957 | // be convenient for applications to discover the existence of newly |
| 958 | // created and terminating JVMs by watching the file system name space |
| 959 | // for files being created or removed. |
| 960 | // |
| 961 | static char* mmap_create_shared(size_t size) { |
| 962 | |
| 963 | int result; |
| 964 | int fd; |
| 965 | char* mapAddress; |
| 966 | |
| 967 | int vmid = os::current_process_id(); |
| 968 | |
| 969 | char* user_name = get_user_name(geteuid()); |
| 970 | |
| 971 | if (user_name == NULL__null) |
| 972 | return NULL__null; |
| 973 | |
| 974 | char* dirname = get_user_tmp_dir(user_name, vmid, -1); |
| 975 | char* filename = get_sharedmem_filename(dirname, vmid, -1); |
| 976 | |
| 977 | // get the short filename |
| 978 | char* short_filename = strrchr(filename, '/'); |
| 979 | if (short_filename == NULL__null) { |
| 980 | short_filename = filename; |
| 981 | } else { |
| 982 | short_filename++; |
| 983 | } |
| 984 | |
| 985 | // cleanup any stale shared memory files |
| 986 | cleanup_sharedmem_resources(dirname); |
| 987 | |
| 988 | assert(((size > 0) && (size % os::vm_page_size() == 0)),do { if (!(((size > 0) && (size % os::vm_page_size () == 0)))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 989, "assert(" "((size > 0) && (size % os::vm_page_size() == 0))" ") failed", "unexpected PerfMemory region size"); ::breakpoint (); } } while (0) |
| 989 | "unexpected PerfMemory region size")do { if (!(((size > 0) && (size % os::vm_page_size () == 0)))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 989, "assert(" "((size > 0) && (size % os::vm_page_size() == 0))" ") failed", "unexpected PerfMemory region size"); ::breakpoint (); } } while (0); |
| 990 | |
| 991 | fd = create_sharedmem_resources(dirname, short_filename, size); |
| 992 | |
| 993 | FREE_C_HEAP_ARRAY(char, user_name)FreeHeap((char*)(user_name)); |
| 994 | FREE_C_HEAP_ARRAY(char, dirname)FreeHeap((char*)(dirname)); |
| 995 | |
| 996 | if (fd == -1) { |
| 997 | FREE_C_HEAP_ARRAY(char, filename)FreeHeap((char*)(filename)); |
| 998 | return NULL__null; |
| 999 | } |
| 1000 | |
| 1001 | mapAddress = (char*)::mmap((char*)0, size, PROT_READ0x1|PROT_WRITE0x2, MAP_SHARED0x01, fd, 0); |
| 1002 | |
| 1003 | result = ::close(fd); |
| 1004 | assert(result != OS_ERR, "could not close file")do { if (!(result != OS_ERR)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 1004, "assert(" "result != OS_ERR" ") failed", "could not close file" ); ::breakpoint(); } } while (0); |
| 1005 | |
| 1006 | if (mapAddress == MAP_FAILED((void *) -1)) { |
| 1007 | if (PrintMiscellaneous && Verbose) { |
| 1008 | warning("mmap failed - %s\n", os::strerror(errno(*__errno_location ()))); |
| 1009 | } |
| 1010 | remove_file(filename); |
| 1011 | FREE_C_HEAP_ARRAY(char, filename)FreeHeap((char*)(filename)); |
| 1012 | return NULL__null; |
| 1013 | } |
| 1014 | |
| 1015 | // save the file name for use in delete_shared_memory() |
| 1016 | backing_store_file_name = filename; |
| 1017 | |
| 1018 | // clear the shared memory region |
| 1019 | (void)::memset((void*) mapAddress, 0, size); |
| 1020 | |
| 1021 | // it does not go through os api, the operation has to record from here |
| 1022 | MemTracker::record_virtual_memory_reserve_and_commit((address)mapAddress, size, CURRENT_PC((MemTracker::tracking_level() == NMT_detail) ? NativeCallStack (0) : NativeCallStack::empty_stack()), mtInternal); |
| 1023 | |
| 1024 | return mapAddress; |
| 1025 | } |
| 1026 | |
| 1027 | // release a named shared memory region that was mmap-ed. |
| 1028 | // |
| 1029 | static void unmap_shared(char* addr, size_t bytes) { |
| 1030 | int res; |
| 1031 | if (MemTracker::enabled()) { |
| 1032 | // Note: Tracker contains a ThreadCritical. |
| 1033 | Tracker tkr(Tracker::release); |
| 1034 | res = ::munmap(addr, bytes); |
| 1035 | if (res == 0) { |
| 1036 | tkr.record((address)addr, bytes); |
| 1037 | } |
| 1038 | } else { |
| 1039 | res = ::munmap(addr, bytes); |
| 1040 | } |
| 1041 | if (res != 0) { |
| 1042 | log_info(os)(!(LogImpl<(LogTag::_os), (LogTag::__NO_TAG), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG) >::is_level(LogLevel::Info))) ? (void)0 : LogImpl<(LogTag ::_os), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG)>::write<LogLevel ::Info>("os::release_memory failed (" PTR_FORMAT"0x%016" "l" "x" ", " SIZE_FORMAT"%" "l" "u" ")", p2i(addr), bytes); |
| 1043 | } |
| 1044 | } |
| 1045 | |
| 1046 | // create the PerfData memory region in shared memory. |
| 1047 | // |
| 1048 | static char* create_shared_memory(size_t size) { |
| 1049 | |
| 1050 | // create the shared memory region. |
| 1051 | return mmap_create_shared(size); |
| 1052 | } |
| 1053 | |
| 1054 | // delete the shared PerfData memory region |
| 1055 | // |
| 1056 | static void delete_shared_memory(char* addr, size_t size) { |
| 1057 | |
| 1058 | // cleanup the persistent shared memory resources. since DestroyJavaVM does |
| 1059 | // not support unloading of the JVM, unmapping of the memory resource is |
| 1060 | // not performed. The memory will be reclaimed by the OS upon termination of |
| 1061 | // the process. The backing store file is deleted from the file system. |
| 1062 | |
| 1063 | assert(!PerfDisableSharedMem, "shouldn't be here")do { if (!(!PerfDisableSharedMem)) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 1063, "assert(" "!PerfDisableSharedMem" ") failed", "shouldn't be here" ); ::breakpoint(); } } while (0); |
| 1064 | |
| 1065 | if (backing_store_file_name != NULL__null) { |
| 1066 | remove_file(backing_store_file_name); |
| 1067 | // Don't.. Free heap memory could deadlock os::abort() if it is called |
| 1068 | // from signal handler. OS will reclaim the heap memory. |
| 1069 | // FREE_C_HEAP_ARRAY(char, backing_store_file_name); |
| 1070 | backing_store_file_name = NULL__null; |
| 1071 | } |
| 1072 | } |
| 1073 | |
| 1074 | // return the size of the file for the given file descriptor |
| 1075 | // or 0 if it is not a valid size for a shared memory file |
| 1076 | // |
| 1077 | static size_t sharedmem_filesize(int fd, TRAPSJavaThread* __the_thread__) { |
| 1078 | |
| 1079 | struct stat statbuf; |
| 1080 | int result; |
| 1081 | |
| 1082 | RESTARTABLE(::fstat(fd, &statbuf), result)do { result = ::fstat(fd, &statbuf); } while(((int)result == OS_ERR) && ((*__errno_location ()) == 4)); |
| 1083 | if (result == OS_ERR) { |
| 1084 | if (PrintMiscellaneous && Verbose) { |
| 1085 | warning("fstat failed: %s\n", os::strerror(errno(*__errno_location ()))); |
| 1086 | } |
| 1087 | THROW_MSG_0(vmSymbols::java_io_IOException(),{ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 1088, vmSymbols::java_io_IOException(), "Could not determine PerfMemory size" ); return 0; } |
| 1088 | "Could not determine PerfMemory size"){ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 1088, vmSymbols::java_io_IOException(), "Could not determine PerfMemory size" ); return 0; }; |
| 1089 | } |
| 1090 | |
| 1091 | if ((statbuf.st_size == 0) || |
| 1092 | ((size_t)statbuf.st_size % os::vm_page_size() != 0)) { |
| 1093 | THROW_MSG_0(vmSymbols::java_io_IOException(),{ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 1094, vmSymbols::java_io_IOException(), "Invalid PerfMemory size" ); return 0; } |
| 1094 | "Invalid PerfMemory size"){ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 1094, vmSymbols::java_io_IOException(), "Invalid PerfMemory size" ); return 0; }; |
| 1095 | } |
| 1096 | |
| 1097 | return (size_t)statbuf.st_size; |
| 1098 | } |
| 1099 | |
| 1100 | // attach to a named shared memory region. |
| 1101 | // |
| 1102 | static void mmap_attach_shared(const char* user, int vmid, PerfMemory::PerfMemoryMode mode, char** addr, size_t* sizep, TRAPSJavaThread* __the_thread__) { |
| 1103 | |
| 1104 | char* mapAddress; |
| 1105 | int result; |
| 1106 | int fd; |
| 1107 | size_t size = 0; |
| 1108 | const char* luser = NULL__null; |
| 1109 | |
| 1110 | int mmap_prot; |
| 1111 | int file_flags; |
| 1112 | |
| 1113 | ResourceMark rm; |
| 1114 | |
| 1115 | // map the high level access mode to the appropriate permission |
| 1116 | // constructs for the file and the shared memory mapping. |
| 1117 | if (mode == PerfMemory::PERF_MODE_RO) { |
| 1118 | mmap_prot = PROT_READ0x1; |
| 1119 | file_flags = O_RDONLY00 | O_NOFOLLOW0400000; |
| 1120 | } |
| 1121 | else if (mode == PerfMemory::PERF_MODE_RW) { |
| 1122 | #ifdef LATER |
| 1123 | mmap_prot = PROT_READ0x1 | PROT_WRITE0x2; |
| 1124 | file_flags = O_RDWR02 | O_NOFOLLOW0400000; |
| 1125 | #else |
| 1126 | THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),{ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 1127, vmSymbols::java_lang_IllegalArgumentException(), "Unsupported access mode" ); return; } |
| 1127 | "Unsupported access mode"){ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 1127, vmSymbols::java_lang_IllegalArgumentException(), "Unsupported access mode" ); return; }; |
| 1128 | #endif |
| 1129 | } |
| 1130 | else { |
| 1131 | THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),{ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 1132, vmSymbols::java_lang_IllegalArgumentException(), "Illegal access mode" ); return; } |
| 1132 | "Illegal access mode"){ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 1132, vmSymbols::java_lang_IllegalArgumentException(), "Illegal access mode" ); return; }; |
| 1133 | } |
| 1134 | |
| 1135 | // for linux, determine if vmid is for a containerized process |
| 1136 | int nspid = LINUX_ONLY(os::Linux::get_namespace_pid(vmid))os::Linux::get_namespace_pid(vmid) NOT_LINUX(-1); |
| 1137 | |
| 1138 | if (user == NULL__null || strlen(user) == 0) { |
| 1139 | luser = get_user_name(vmid, &nspid, CHECK__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return ; (void)(0); |
| 1140 | } |
| 1141 | else { |
| 1142 | luser = user; |
| 1143 | } |
| 1144 | |
| 1145 | if (luser == NULL__null) { |
| 1146 | THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),{ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 1147, vmSymbols::java_lang_IllegalArgumentException(), "Could not map vmid to user Name" ); return; } |
| 1147 | "Could not map vmid to user Name"){ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 1147, vmSymbols::java_lang_IllegalArgumentException(), "Could not map vmid to user Name" ); return; }; |
| 1148 | } |
| 1149 | |
| 1150 | char* dirname = get_user_tmp_dir(luser, vmid, nspid); |
| 1151 | |
| 1152 | // since we don't follow symbolic links when creating the backing |
| 1153 | // store file, we don't follow them when attaching either. |
| 1154 | // |
| 1155 | if (!is_directory_secure(dirname)) { |
| 1156 | FREE_C_HEAP_ARRAY(char, dirname)FreeHeap((char*)(dirname)); |
| 1157 | if (luser != user) { |
| 1158 | FREE_C_HEAP_ARRAY(char, luser)FreeHeap((char*)(luser)); |
| 1159 | } |
| 1160 | THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),{ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 1161, vmSymbols::java_lang_IllegalArgumentException(), "Process not found" ); return; } |
| 1161 | "Process not found"){ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 1161, vmSymbols::java_lang_IllegalArgumentException(), "Process not found" ); return; }; |
| 1162 | } |
| 1163 | |
| 1164 | char* filename = get_sharedmem_filename(dirname, vmid, nspid); |
| 1165 | |
| 1166 | // copy heap memory to resource memory. the open_sharedmem_file |
| 1167 | // method below need to use the filename, but could throw an |
| 1168 | // exception. using a resource array prevents the leak that |
| 1169 | // would otherwise occur. |
| 1170 | char* rfilename = NEW_RESOURCE_ARRAY(char, strlen(filename) + 1)(char*) resource_allocate_bytes((strlen(filename) + 1) * sizeof (char)); |
| 1171 | strcpy(rfilename, filename); |
| 1172 | |
| 1173 | // free the c heap resources that are no longer needed |
| 1174 | if (luser != user) FREE_C_HEAP_ARRAY(char, luser)FreeHeap((char*)(luser)); |
| 1175 | FREE_C_HEAP_ARRAY(char, dirname)FreeHeap((char*)(dirname)); |
| 1176 | FREE_C_HEAP_ARRAY(char, filename)FreeHeap((char*)(filename)); |
| 1177 | |
| 1178 | // open the shared memory file for the give vmid |
| 1179 | fd = open_sharedmem_file(rfilename, file_flags, THREAD__the_thread__); |
| 1180 | |
| 1181 | if (fd == OS_ERR) { |
| 1182 | return; |
| 1183 | } |
| 1184 | |
| 1185 | if (HAS_PENDING_EXCEPTION(((ThreadShadow*)__the_thread__)->has_pending_exception())) { |
| 1186 | ::close(fd); |
| 1187 | return; |
| 1188 | } |
| 1189 | |
| 1190 | if (*sizep == 0) { |
| 1191 | size = sharedmem_filesize(fd, CHECK__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return ; (void)(0); |
| 1192 | } else { |
| 1193 | size = *sizep; |
| 1194 | } |
| 1195 | |
| 1196 | assert(size > 0, "unexpected size <= 0")do { if (!(size > 0)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 1196, "assert(" "size > 0" ") failed", "unexpected size <= 0" ); ::breakpoint(); } } while (0); |
| 1197 | |
| 1198 | mapAddress = (char*)::mmap((char*)0, size, mmap_prot, MAP_SHARED0x01, fd, 0); |
| 1199 | |
| 1200 | result = ::close(fd); |
| 1201 | assert(result != OS_ERR, "could not close file")do { if (!(result != OS_ERR)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 1201, "assert(" "result != OS_ERR" ") failed", "could not close file" ); ::breakpoint(); } } while (0); |
| 1202 | |
| 1203 | if (mapAddress == MAP_FAILED((void *) -1)) { |
| 1204 | if (PrintMiscellaneous && Verbose) { |
| 1205 | warning("mmap failed: %s\n", os::strerror(errno(*__errno_location ()))); |
| 1206 | } |
| 1207 | THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),{ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 1208, vmSymbols::java_lang_OutOfMemoryError(), "Could not map PerfMemory" ); return; } |
| 1208 | "Could not map PerfMemory"){ Exceptions::_throw_msg(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 1208, vmSymbols::java_lang_OutOfMemoryError(), "Could not map PerfMemory" ); return; }; |
| 1209 | } |
| 1210 | |
| 1211 | // it does not go through os api, the operation has to record from here |
| 1212 | MemTracker::record_virtual_memory_reserve_and_commit((address)mapAddress, size, CURRENT_PC((MemTracker::tracking_level() == NMT_detail) ? NativeCallStack (0) : NativeCallStack::empty_stack()), mtInternal); |
| 1213 | |
| 1214 | *addr = mapAddress; |
| 1215 | *sizep = size; |
| 1216 | |
| 1217 | log_debug(perf, memops)(!(LogImpl<(LogTag::_perf), (LogTag::_memops), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG) >::is_level(LogLevel::Debug))) ? (void)0 : LogImpl<(LogTag ::_perf), (LogTag::_memops), (LogTag::__NO_TAG), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG)>::write<LogLevel ::Debug>("mapped " SIZE_FORMAT"%" "l" "u" " bytes for vmid %d at " |
| 1218 | INTPTR_FORMAT"0x%016" "l" "x", size, vmid, p2i((void*)mapAddress)); |
| 1219 | } |
| 1220 | |
| 1221 | // create the PerfData memory region |
| 1222 | // |
| 1223 | // This method creates the memory region used to store performance |
| 1224 | // data for the JVM. The memory may be created in standard or |
| 1225 | // shared memory. |
| 1226 | // |
| 1227 | void PerfMemory::create_memory_region(size_t size) { |
| 1228 | |
| 1229 | if (PerfDisableSharedMem) { |
| 1230 | // do not share the memory for the performance data. |
| 1231 | _start = create_standard_memory(size); |
| 1232 | } |
| 1233 | else { |
| 1234 | _start = create_shared_memory(size); |
| 1235 | if (_start == NULL__null) { |
| 1236 | |
| 1237 | // creation of the shared memory region failed, attempt |
| 1238 | // to create a contiguous, non-shared memory region instead. |
| 1239 | // |
| 1240 | if (PrintMiscellaneous && Verbose) { |
| 1241 | warning("Reverting to non-shared PerfMemory region.\n"); |
| 1242 | } |
| 1243 | FLAG_SET_ERGO(PerfDisableSharedMem, true)(Flag_PerfDisableSharedMem_set((true), JVMFlagOrigin::ERGONOMIC )); |
| 1244 | _start = create_standard_memory(size); |
| 1245 | } |
| 1246 | } |
| 1247 | |
| 1248 | if (_start != NULL__null) _capacity = size; |
| 1249 | |
| 1250 | } |
| 1251 | |
| 1252 | // delete the PerfData memory region |
| 1253 | // |
| 1254 | // This method deletes the memory region used to store performance |
| 1255 | // data for the JVM. The memory region indicated by the <address, size> |
| 1256 | // tuple will be inaccessible after a call to this method. |
| 1257 | // |
| 1258 | void PerfMemory::delete_memory_region() { |
| 1259 | |
| 1260 | assert((start() != NULL && capacity() > 0), "verify proper state")do { if (!((start() != __null && capacity() > 0))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 1260, "assert(" "(start() != __null && capacity() > 0)" ") failed", "verify proper state"); ::breakpoint(); } } while (0); |
| 1261 | |
| 1262 | // If user specifies PerfDataSaveFile, it will save the performance data |
| 1263 | // to the specified file name no matter whether PerfDataSaveToFile is specified |
| 1264 | // or not. In other word, -XX:PerfDataSaveFile=.. overrides flag |
| 1265 | // -XX:+PerfDataSaveToFile. |
| 1266 | if (PerfDataSaveToFile || PerfDataSaveFile != NULL__null) { |
| 1267 | save_memory_to_file(start(), capacity()); |
| 1268 | } |
| 1269 | |
| 1270 | if (PerfDisableSharedMem) { |
| 1271 | delete_standard_memory(start(), capacity()); |
| 1272 | } |
| 1273 | else { |
| 1274 | delete_shared_memory(start(), capacity()); |
| 1275 | } |
| 1276 | } |
| 1277 | |
| 1278 | // attach to the PerfData memory region for another JVM |
| 1279 | // |
| 1280 | // This method returns an <address, size> tuple that points to |
| 1281 | // a memory buffer that is kept reasonably synchronized with |
| 1282 | // the PerfData memory region for the indicated JVM. This |
| 1283 | // buffer may be kept in synchronization via shared memory |
| 1284 | // or some other mechanism that keeps the buffer updated. |
| 1285 | // |
| 1286 | // If the JVM chooses not to support the attachability feature, |
| 1287 | // this method should throw an UnsupportedOperation exception. |
| 1288 | // |
| 1289 | // This implementation utilizes named shared memory to map |
| 1290 | // the indicated process's PerfData memory region into this JVMs |
| 1291 | // address space. |
| 1292 | // |
| 1293 | void PerfMemory::attach(const char* user, int vmid, PerfMemoryMode mode, char** addrp, size_t* sizep, TRAPSJavaThread* __the_thread__) { |
| 1294 | |
| 1295 | if (vmid == 0 || vmid == os::current_process_id()) { |
| 1296 | *addrp = start(); |
| 1297 | *sizep = capacity(); |
| 1298 | return; |
| 1299 | } |
| 1300 | |
| 1301 | mmap_attach_shared(user, vmid, mode, addrp, sizep, CHECK__the_thread__); if ((((ThreadShadow*)__the_thread__)->has_pending_exception ())) return ; (void)(0); |
| 1302 | } |
| 1303 | |
| 1304 | // detach from the PerfData memory region of another JVM |
| 1305 | // |
| 1306 | // This method detaches the PerfData memory region of another |
| 1307 | // JVM, specified as an <address, size> tuple of a buffer |
| 1308 | // in this process's address space. This method may perform |
| 1309 | // arbitrary actions to accomplish the detachment. The memory |
| 1310 | // region specified by <address, size> will be inaccessible after |
| 1311 | // a call to this method. |
| 1312 | // |
| 1313 | // If the JVM chooses not to support the attachability feature, |
| 1314 | // this method should throw an UnsupportedOperation exception. |
| 1315 | // |
| 1316 | // This implementation utilizes named shared memory to detach |
| 1317 | // the indicated process's PerfData memory region from this |
| 1318 | // process's address space. |
| 1319 | // |
| 1320 | void PerfMemory::detach(char* addr, size_t bytes) { |
| 1321 | |
| 1322 | assert(addr != 0, "address sanity check")do { if (!(addr != 0)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 1322, "assert(" "addr != 0" ") failed", "address sanity check" ); ::breakpoint(); } } while (0); |
| 1323 | assert(bytes > 0, "capacity sanity check")do { if (!(bytes > 0)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/os/posix/perfMemory_posix.cpp" , 1323, "assert(" "bytes > 0" ") failed", "capacity sanity check" ); ::breakpoint(); } } while (0); |
| 1324 | |
| 1325 | if (PerfMemory::contains(addr) || PerfMemory::contains(addr + bytes - 1)) { |
| 1326 | // prevent accidental detachment of this process's PerfMemory region |
| 1327 | return; |
| 1328 | } |
| 1329 | |
| 1330 | unmap_shared(addr, bytes); |
| 1331 | } |