Mercurial > hg > graal-jvmci-8
annotate src/os/aix/vm/perfMemory_aix.cpp @ 23455:9f8038f83a6e
8130910: hsperfdata file is created in wrong directory and not cleaned up if /tmp/hsperfdata_<username> has wrong permissions
Summary: Add check for fchir() failure and disable shared PerfMemory in that case.
Reviewed-by: dcubed, simonis, gthornbr
author | clanger |
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date | Tue, 17 Nov 2015 09:39:45 -0800 |
parents | b9c06f87e476 |
children | 2d23269a45a0 |
rev | line source |
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1 /* |
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2 * Copyright (c) 2001, 2015, Oracle and/or its affiliates. All rights reserved. |
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3 * Copyright 2012, 2013 SAP AG. All rights reserved. |
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4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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5 * |
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6 * This code is free software; you can redistribute it and/or modify it |
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7 * under the terms of the GNU General Public License version 2 only, as |
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8 * published by the Free Software Foundation. |
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9 * |
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10 * This code is distributed in the hope that it will be useful, but WITHOUT |
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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13 * version 2 for more details (a copy is included in the LICENSE file that |
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14 * accompanied this code). |
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15 * |
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16 * You should have received a copy of the GNU General Public License version |
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17 * 2 along with this work; if not, write to the Free Software Foundation, |
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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19 * |
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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21 * or visit www.oracle.com if you need additional information or have any |
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22 * questions. |
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23 * |
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24 */ |
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25 |
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26 #include "precompiled.hpp" |
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27 #include "classfile/vmSymbols.hpp" |
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28 #include "memory/allocation.inline.hpp" |
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29 #include "memory/resourceArea.hpp" |
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30 #include "oops/oop.inline.hpp" |
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31 #include "os_aix.inline.hpp" |
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32 #include "runtime/handles.inline.hpp" |
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33 #include "runtime/perfMemory.hpp" |
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34 #include "services/memTracker.hpp" |
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35 #include "utilities/exceptions.hpp" |
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36 |
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37 // put OS-includes here |
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38 # include <sys/types.h> |
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39 # include <sys/mman.h> |
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40 # include <errno.h> |
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41 # include <stdio.h> |
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42 # include <unistd.h> |
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43 # include <sys/stat.h> |
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44 # include <signal.h> |
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45 # include <pwd.h> |
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46 |
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47 static char* backing_store_file_name = NULL; // name of the backing store |
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48 // file, if successfully created. |
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49 |
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50 // Standard Memory Implementation Details |
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51 |
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52 // create the PerfData memory region in standard memory. |
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53 // |
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54 static char* create_standard_memory(size_t size) { |
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55 |
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56 // allocate an aligned chuck of memory |
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57 char* mapAddress = os::reserve_memory(size); |
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58 |
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59 if (mapAddress == NULL) { |
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60 return NULL; |
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61 } |
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62 |
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63 // commit memory |
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64 if (!os::commit_memory(mapAddress, size, !ExecMem)) { |
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65 if (PrintMiscellaneous && Verbose) { |
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66 warning("Could not commit PerfData memory\n"); |
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67 } |
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68 os::release_memory(mapAddress, size); |
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69 return NULL; |
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70 } |
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71 |
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72 return mapAddress; |
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73 } |
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74 |
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75 // delete the PerfData memory region |
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76 // |
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77 static void delete_standard_memory(char* addr, size_t size) { |
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78 |
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79 // there are no persistent external resources to cleanup for standard |
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80 // memory. since DestroyJavaVM does not support unloading of the JVM, |
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81 // cleanup of the memory resource is not performed. The memory will be |
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82 // reclaimed by the OS upon termination of the process. |
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83 // |
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84 return; |
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85 } |
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86 |
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87 // save the specified memory region to the given file |
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88 // |
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89 // Note: this function might be called from signal handler (by os::abort()), |
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90 // don't allocate heap memory. |
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91 // |
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92 static void save_memory_to_file(char* addr, size_t size) { |
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93 |
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94 const char* destfile = PerfMemory::get_perfdata_file_path(); |
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95 assert(destfile[0] != '\0', "invalid PerfData file path"); |
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96 |
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97 int result; |
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98 |
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99 RESTARTABLE(::open(destfile, O_CREAT|O_WRONLY|O_TRUNC, S_IREAD|S_IWRITE), |
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100 result);; |
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101 if (result == OS_ERR) { |
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102 if (PrintMiscellaneous && Verbose) { |
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103 warning("Could not create Perfdata save file: %s: %s\n", |
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104 destfile, strerror(errno)); |
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105 } |
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106 } else { |
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107 int fd = result; |
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108 |
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109 for (size_t remaining = size; remaining > 0;) { |
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110 |
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111 RESTARTABLE(::write(fd, addr, remaining), result); |
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112 if (result == OS_ERR) { |
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113 if (PrintMiscellaneous && Verbose) { |
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114 warning("Could not write Perfdata save file: %s: %s\n", |
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115 destfile, strerror(errno)); |
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116 } |
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117 break; |
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118 } |
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119 |
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120 remaining -= (size_t)result; |
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121 addr += result; |
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122 } |
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123 |
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124 RESTARTABLE(::close(fd), result); |
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125 if (PrintMiscellaneous && Verbose) { |
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126 if (result == OS_ERR) { |
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127 warning("Could not close %s: %s\n", destfile, strerror(errno)); |
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128 } |
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129 } |
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130 } |
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131 FREE_C_HEAP_ARRAY(char, destfile, mtInternal); |
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132 } |
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133 |
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134 |
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135 // Shared Memory Implementation Details |
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136 |
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137 // Note: the solaris and linux shared memory implementation uses the mmap |
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138 // interface with a backing store file to implement named shared memory. |
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139 // Using the file system as the name space for shared memory allows a |
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140 // common name space to be supported across a variety of platforms. It |
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141 // also provides a name space that Java applications can deal with through |
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142 // simple file apis. |
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143 // |
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144 // The solaris and linux implementations store the backing store file in |
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145 // a user specific temporary directory located in the /tmp file system, |
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146 // which is always a local file system and is sometimes a RAM based file |
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147 // system. |
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148 |
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149 // return the user specific temporary directory name. |
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150 // |
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151 // the caller is expected to free the allocated memory. |
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152 // |
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153 static char* get_user_tmp_dir(const char* user) { |
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154 |
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155 const char* tmpdir = os::get_temp_directory(); |
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156 const char* perfdir = PERFDATA_NAME; |
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157 size_t nbytes = strlen(tmpdir) + strlen(perfdir) + strlen(user) + 3; |
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158 char* dirname = NEW_C_HEAP_ARRAY(char, nbytes, mtInternal); |
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159 |
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160 // construct the path name to user specific tmp directory |
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161 snprintf(dirname, nbytes, "%s/%s_%s", tmpdir, perfdir, user); |
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162 |
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163 return dirname; |
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164 } |
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165 |
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166 // convert the given file name into a process id. if the file |
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167 // does not meet the file naming constraints, return 0. |
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168 // |
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169 static pid_t filename_to_pid(const char* filename) { |
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170 |
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171 // a filename that doesn't begin with a digit is not a |
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172 // candidate for conversion. |
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173 // |
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174 if (!isdigit(*filename)) { |
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175 return 0; |
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176 } |
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177 |
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178 // check if file name can be converted to an integer without |
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179 // any leftover characters. |
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180 // |
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181 char* remainder = NULL; |
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182 errno = 0; |
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183 pid_t pid = (pid_t)strtol(filename, &remainder, 10); |
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184 |
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185 if (errno != 0) { |
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186 return 0; |
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187 } |
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188 |
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189 // check for left over characters. If any, then the filename is |
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190 // not a candidate for conversion. |
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191 // |
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192 if (remainder != NULL && *remainder != '\0') { |
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193 return 0; |
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194 } |
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195 |
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196 // successful conversion, return the pid |
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197 return pid; |
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198 } |
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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 static bool is_statbuf_secure(struct stat *statp) { |
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205 if (S_ISLNK(statp->st_mode) || !S_ISDIR(statp->st_mode)) { |
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206 // The path represents a link or some non-directory file type, |
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207 // which is not what we expected. Declare it insecure. |
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208 // |
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209 return false; |
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210 } |
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211 // We have an existing directory, check if the permissions are safe. |
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212 if ((statp->st_mode & (S_IWGRP|S_IWOTH)) != 0) { |
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213 // The directory is open for writing and could be subjected |
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214 // to a symlink or a hard link attack. Declare it insecure. |
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215 return false; |
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216 } |
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217 // See if the uid of the directory matches the effective uid of the process. |
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218 // |
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219 if (statp->st_uid != geteuid()) { |
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220 // The directory was not created by this user, declare it insecure. |
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221 return false; |
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222 } |
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223 return true; |
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224 } |
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225 |
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226 |
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227 // Check if the given path is considered a secure directory for |
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228 // the backing store files. Returns true if the directory exists |
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229 // and is considered a secure location. Returns false if the path |
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230 // is a symbolic link or if an error occurred. |
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231 static bool is_directory_secure(const char* path) { |
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232 struct stat statbuf; |
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233 int result = 0; |
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234 |
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235 RESTARTABLE(::lstat(path, &statbuf), result); |
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236 if (result == OS_ERR) { |
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237 return false; |
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238 } |
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239 |
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240 // The path exists, see if it is secure. |
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241 return is_statbuf_secure(&statbuf); |
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242 } |
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243 |
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244 // (Taken over from Solaris to support the O_NOFOLLOW case on AIX.) |
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245 // Check if the given directory file descriptor is considered a secure |
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246 // directory for the backing store files. Returns true if the directory |
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247 // exists and is considered a secure location. Returns false if the path |
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248 // is a symbolic link or if an error occurred. |
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249 static bool is_dirfd_secure(int dir_fd) { |
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250 struct stat statbuf; |
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251 int result = 0; |
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252 |
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253 RESTARTABLE(::fstat(dir_fd, &statbuf), result); |
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254 if (result == OS_ERR) { |
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255 return false; |
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256 } |
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257 |
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258 // The path exists, now check its mode. |
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259 return is_statbuf_secure(&statbuf); |
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260 } |
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261 |
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262 |
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263 // Check to make sure fd1 and fd2 are referencing the same file system object. |
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264 static bool is_same_fsobject(int fd1, int fd2) { |
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265 struct stat statbuf1; |
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266 struct stat statbuf2; |
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267 int result = 0; |
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268 |
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269 RESTARTABLE(::fstat(fd1, &statbuf1), result); |
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270 if (result == OS_ERR) { |
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271 return false; |
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272 } |
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273 RESTARTABLE(::fstat(fd2, &statbuf2), result); |
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274 if (result == OS_ERR) { |
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275 return false; |
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276 } |
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277 |
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278 if ((statbuf1.st_ino == statbuf2.st_ino) && |
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279 (statbuf1.st_dev == statbuf2.st_dev)) { |
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280 return true; |
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281 } else { |
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282 return false; |
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283 } |
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284 } |
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285 |
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286 // Helper functions for open without O_NOFOLLOW which is not present on AIX 5.3/6.1. |
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287 // We use the jdk6 implementation here. |
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288 #ifndef O_NOFOLLOW |
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289 // The O_NOFOLLOW oflag doesn't exist before solaris 5.10, this is to simulate that behaviour |
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290 // was done in jdk 5/6 hotspot by Oracle this way |
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291 static int open_o_nofollow_impl(const char* path, int oflag, mode_t mode, bool use_mode) { |
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292 struct stat orig_st; |
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293 struct stat new_st; |
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294 bool create; |
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295 int error; |
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296 int fd; |
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297 |
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298 create = false; |
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299 |
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300 if (lstat(path, &orig_st) != 0) { |
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301 if (errno == ENOENT && (oflag & O_CREAT) != 0) { |
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302 // File doesn't exist, but_we want to create it, add O_EXCL flag |
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303 // to make sure no-one creates it (or a symlink) before us |
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304 // This works as we expect with symlinks, from posix man page: |
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305 // 'If O_EXCL and O_CREAT are set, and path names a symbolic |
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306 // link, open() shall fail and set errno to [EEXIST]'. |
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307 oflag |= O_EXCL; |
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308 create = true; |
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309 } else { |
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310 // File doesn't exist, and we are not creating it. |
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311 return OS_ERR; |
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312 } |
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313 } else { |
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314 // Lstat success, check if existing file is a link. |
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315 if ((orig_st.st_mode & S_IFMT) == S_IFLNK) { |
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316 // File is a symlink. |
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317 errno = ELOOP; |
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318 return OS_ERR; |
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319 } |
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320 } |
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321 |
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322 if (use_mode == true) { |
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323 fd = open(path, oflag, mode); |
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324 } else { |
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325 fd = open(path, oflag); |
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326 } |
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327 |
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328 if (fd == OS_ERR) { |
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329 return fd; |
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330 } |
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331 |
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332 // Can't do inode checks on before/after if we created the file. |
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333 if (create == false) { |
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334 if (fstat(fd, &new_st) != 0) { |
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335 // Keep errno from fstat, in case close also fails. |
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336 error = errno; |
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337 ::close(fd); |
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338 errno = error; |
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339 return OS_ERR; |
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340 } |
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341 |
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342 if (orig_st.st_dev != new_st.st_dev || orig_st.st_ino != new_st.st_ino) { |
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343 // File was tampered with during race window. |
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344 ::close(fd); |
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345 errno = EEXIST; |
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346 if (PrintMiscellaneous && Verbose) { |
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347 warning("possible file tampering attempt detected when opening %s", path); |
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348 } |
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349 return OS_ERR; |
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350 } |
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351 } |
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352 |
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353 return fd; |
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354 } |
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355 |
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356 static int open_o_nofollow(const char* path, int oflag, mode_t mode) { |
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357 return open_o_nofollow_impl(path, oflag, mode, true); |
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358 } |
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359 |
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360 static int open_o_nofollow(const char* path, int oflag) { |
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361 return open_o_nofollow_impl(path, oflag, 0, false); |
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362 } |
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363 #endif |
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364 |
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365 // Open the directory of the given path and validate it. |
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366 // Return a DIR * of the open directory. |
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367 static DIR *open_directory_secure(const char* dirname) { |
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368 // Open the directory using open() so that it can be verified |
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369 // to be secure by calling is_dirfd_secure(), opendir() and then check |
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370 // to see if they are the same file system object. This method does not |
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371 // introduce a window of opportunity for the directory to be attacked that |
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372 // calling opendir() and is_directory_secure() does. |
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373 int result; |
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374 DIR *dirp = NULL; |
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375 |
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376 // No O_NOFOLLOW defined at buildtime, and it is not documented for open; |
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377 // so provide a workaround in this case. |
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378 #ifdef O_NOFOLLOW |
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379 RESTARTABLE(::open(dirname, O_RDONLY|O_NOFOLLOW), result); |
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380 #else |
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381 // workaround (jdk6 coding) |
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382 RESTARTABLE(::open_o_nofollow(dirname, O_RDONLY), result); |
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383 #endif |
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384 |
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385 if (result == OS_ERR) { |
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386 // Directory doesn't exist or is a symlink, so there is nothing to cleanup. |
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387 if (PrintMiscellaneous && Verbose) { |
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388 if (errno == ELOOP) { |
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389 warning("directory %s is a symlink and is not secure\n", dirname); |
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390 } else { |
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391 warning("could not open directory %s: %s\n", dirname, strerror(errno)); |
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392 } |
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393 } |
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394 return dirp; |
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395 } |
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396 int fd = result; |
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397 |
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398 // Determine if the open directory is secure. |
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399 if (!is_dirfd_secure(fd)) { |
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400 // The directory is not a secure directory. |
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401 os::close(fd); |
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402 return dirp; |
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403 } |
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404 |
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405 // Open the directory. |
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406 dirp = ::opendir(dirname); |
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407 if (dirp == NULL) { |
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408 // The directory doesn't exist, close fd and return. |
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409 os::close(fd); |
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410 return dirp; |
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411 } |
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412 |
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413 // Check to make sure fd and dirp are referencing the same file system object. |
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414 if (!is_same_fsobject(fd, dirp->dd_fd)) { |
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415 // The directory is not secure. |
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416 os::close(fd); |
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417 os::closedir(dirp); |
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418 dirp = NULL; |
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419 return dirp; |
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420 } |
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421 |
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422 // Close initial open now that we know directory is secure |
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423 os::close(fd); |
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424 |
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425 return dirp; |
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426 } |
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427 |
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428 // NOTE: The code below uses fchdir(), open() and unlink() because |
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429 // fdopendir(), openat() and unlinkat() are not supported on all |
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430 // versions. Once the support for fdopendir(), openat() and unlinkat() |
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431 // is available on all supported versions the code can be changed |
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432 // to use these functions. |
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433 |
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434 // Open the directory of the given path, validate it and set the |
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435 // current working directory to it. |
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436 // Return a DIR * of the open directory and the saved cwd fd. |
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437 // |
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438 static DIR *open_directory_secure_cwd(const char* dirname, int *saved_cwd_fd) { |
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439 |
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440 // Open the directory. |
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441 DIR* dirp = open_directory_secure(dirname); |
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442 if (dirp == NULL) { |
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443 // Directory doesn't exist or is insecure, so there is nothing to cleanup. |
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444 return dirp; |
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445 } |
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446 int fd = dirp->dd_fd; |
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447 |
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448 // Open a fd to the cwd and save it off. |
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449 int result; |
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450 RESTARTABLE(::open(".", O_RDONLY), result); |
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451 if (result == OS_ERR) { |
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452 *saved_cwd_fd = -1; |
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453 } else { |
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454 *saved_cwd_fd = result; |
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455 } |
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456 |
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457 // Set the current directory to dirname by using the fd of the directory and |
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458 // handle errors, otherwise shared memory files will be created in cwd. |
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459 result = fchdir(fd); |
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460 if (result == OS_ERR) { |
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461 if (PrintMiscellaneous && Verbose) { |
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462 warning("could not change to directory %s", dirname); |
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463 } |
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464 if (*saved_cwd_fd != -1) { |
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465 ::close(*saved_cwd_fd); |
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466 *saved_cwd_fd = -1; |
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467 } |
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468 // Close the directory. |
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469 os::closedir(dirp); |
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470 return NULL; |
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471 } else { |
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472 return dirp; |
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473 } |
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474 } |
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475 |
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476 // Close the directory and restore the current working directory. |
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477 // |
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478 static void close_directory_secure_cwd(DIR* dirp, int saved_cwd_fd) { |
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479 |
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480 int result; |
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481 // If we have a saved cwd change back to it and close the fd. |
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482 if (saved_cwd_fd != -1) { |
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483 result = fchdir(saved_cwd_fd); |
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484 ::close(saved_cwd_fd); |
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485 } |
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486 |
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487 // Close the directory. |
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488 os::closedir(dirp); |
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489 } |
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490 |
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491 // Check if the given file descriptor is considered a secure. |
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492 static bool is_file_secure(int fd, const char *filename) { |
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493 |
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494 int result; |
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495 struct stat statbuf; |
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496 |
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497 // Determine if the file is secure. |
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498 RESTARTABLE(::fstat(fd, &statbuf), result); |
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499 if (result == OS_ERR) { |
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500 if (PrintMiscellaneous && Verbose) { |
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501 warning("fstat failed on %s: %s\n", filename, strerror(errno)); |
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502 } |
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503 return false; |
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504 } |
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505 if (statbuf.st_nlink > 1) { |
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506 // A file with multiple links is not expected. |
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507 if (PrintMiscellaneous && Verbose) { |
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508 warning("file %s has multiple links\n", filename); |
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509 } |
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510 return false; |
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511 } |
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512 return true; |
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513 } |
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514 |
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515 // Return the user name for the given user id. |
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516 // |
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517 // The caller is expected to free the allocated memory. |
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518 static char* get_user_name(uid_t uid) { |
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519 |
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520 struct passwd pwent; |
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521 |
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522 // Determine the max pwbuf size from sysconf, and hardcode |
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523 // a default if this not available through sysconf. |
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524 long bufsize = sysconf(_SC_GETPW_R_SIZE_MAX); |
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525 if (bufsize == -1) |
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526 bufsize = 1024; |
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527 |
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528 char* pwbuf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); |
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529 |
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530 // POSIX interface to getpwuid_r is used on LINUX |
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531 struct passwd* p; |
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532 int result = getpwuid_r(uid, &pwent, pwbuf, (size_t)bufsize, &p); |
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533 |
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534 if (result != 0 || p == NULL || p->pw_name == NULL || *(p->pw_name) == '\0') { |
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535 if (PrintMiscellaneous && Verbose) { |
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536 if (result != 0) { |
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537 warning("Could not retrieve passwd entry: %s\n", |
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538 strerror(result)); |
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539 } |
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540 else if (p == NULL) { |
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541 // this check is added to protect against an observed problem |
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542 // with getpwuid_r() on RedHat 9 where getpwuid_r returns 0, |
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543 // indicating success, but has p == NULL. This was observed when |
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544 // inserting a file descriptor exhaustion fault prior to the call |
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545 // getpwuid_r() call. In this case, error is set to the appropriate |
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546 // error condition, but this is undocumented behavior. This check |
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547 // is safe under any condition, but the use of errno in the output |
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548 // message may result in an erroneous message. |
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549 // Bug Id 89052 was opened with RedHat. |
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550 // |
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551 warning("Could not retrieve passwd entry: %s\n", |
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552 strerror(errno)); |
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553 } |
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554 else { |
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555 warning("Could not determine user name: %s\n", |
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556 p->pw_name == NULL ? "pw_name = NULL" : |
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557 "pw_name zero length"); |
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558 } |
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|
559 } |
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560 FREE_C_HEAP_ARRAY(char, pwbuf, mtInternal); |
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561 return NULL; |
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562 } |
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|
563 |
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564 char* user_name = NEW_C_HEAP_ARRAY(char, strlen(p->pw_name) + 1, mtInternal); |
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565 strcpy(user_name, p->pw_name); |
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|
566 |
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567 FREE_C_HEAP_ARRAY(char, pwbuf, mtInternal); |
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568 return user_name; |
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|
569 } |
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|
570 |
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571 // return the name of the user that owns the process identified by vmid. |
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572 // |
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573 // This method uses a slow directory search algorithm to find the backing |
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574 // store file for the specified vmid and returns the user name, as determined |
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575 // by the user name suffix of the hsperfdata_<username> directory name. |
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576 // |
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577 // the caller is expected to free the allocated memory. |
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578 // |
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579 static char* get_user_name_slow(int vmid, TRAPS) { |
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|
580 |
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581 // short circuit the directory search if the process doesn't even exist. |
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582 if (kill(vmid, 0) == OS_ERR) { |
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|
583 if (errno == ESRCH) { |
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|
584 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), |
666e6ce3976c
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|
585 "Process not found"); |
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|
586 } |
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|
587 else /* EPERM */ { |
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|
588 THROW_MSG_0(vmSymbols::java_io_IOException(), strerror(errno)); |
666e6ce3976c
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|
589 } |
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|
590 } |
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|
591 |
666e6ce3976c
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|
592 // directory search |
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593 char* oldest_user = NULL; |
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|
594 time_t oldest_ctime = 0; |
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|
595 |
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596 const char* tmpdirname = os::get_temp_directory(); |
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|
597 |
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|
598 DIR* tmpdirp = os::opendir(tmpdirname); |
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|
599 |
666e6ce3976c
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|
600 if (tmpdirp == NULL) { |
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|
601 return NULL; |
666e6ce3976c
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|
602 } |
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|
603 |
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|
604 // for each entry in the directory that matches the pattern hsperfdata_*, |
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|
605 // open the directory and check if the file for the given vmid exists. |
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606 // The file with the expected name and the latest creation date is used |
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|
607 // to determine the user name for the process id. |
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|
608 // |
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|
609 struct dirent* dentry; |
666e6ce3976c
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|
610 char* tdbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(tmpdirname), mtInternal); |
666e6ce3976c
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|
611 errno = 0; |
666e6ce3976c
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|
612 while ((dentry = os::readdir(tmpdirp, (struct dirent *)tdbuf)) != NULL) { |
666e6ce3976c
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|
613 |
666e6ce3976c
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|
614 // check if the directory entry is a hsperfdata file |
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615 if (strncmp(dentry->d_name, PERFDATA_NAME, strlen(PERFDATA_NAME)) != 0) { |
666e6ce3976c
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|
616 continue; |
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|
617 } |
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|
618 |
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|
619 char* usrdir_name = NEW_C_HEAP_ARRAY(char, |
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620 strlen(tmpdirname) + strlen(dentry->d_name) + 2, mtInternal); |
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621 strcpy(usrdir_name, tmpdirname); |
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622 strcat(usrdir_name, "/"); |
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|
623 strcat(usrdir_name, dentry->d_name); |
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|
624 |
20801
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625 // Open the user directory. |
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|
626 DIR* subdirp = open_directory_secure(usrdir_name); |
14415
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|
627 |
666e6ce3976c
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|
628 if (subdirp == NULL) { |
666e6ce3976c
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diff
changeset
|
629 FREE_C_HEAP_ARRAY(char, usrdir_name, mtInternal); |
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630 continue; |
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631 } |
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632 |
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633 // Since we don't create the backing store files in directories |
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634 // pointed to by symbolic links, we also don't follow them when |
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635 // looking for the files. We check for a symbolic link after the |
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636 // call to opendir in order to eliminate a small window where the |
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637 // symlink can be exploited. |
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|
638 // |
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|
639 if (!is_directory_secure(usrdir_name)) { |
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640 FREE_C_HEAP_ARRAY(char, usrdir_name, mtInternal); |
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641 os::closedir(subdirp); |
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642 continue; |
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643 } |
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|
644 |
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645 struct dirent* udentry; |
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646 char* udbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(usrdir_name), mtInternal); |
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647 errno = 0; |
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648 while ((udentry = os::readdir(subdirp, (struct dirent *)udbuf)) != NULL) { |
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|
649 |
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650 if (filename_to_pid(udentry->d_name) == vmid) { |
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651 struct stat statbuf; |
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652 int result; |
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|
653 |
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654 char* filename = NEW_C_HEAP_ARRAY(char, |
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655 strlen(usrdir_name) + strlen(udentry->d_name) + 2, mtInternal); |
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656 |
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657 strcpy(filename, usrdir_name); |
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658 strcat(filename, "/"); |
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659 strcat(filename, udentry->d_name); |
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|
660 |
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661 // don't follow symbolic links for the file |
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662 RESTARTABLE(::lstat(filename, &statbuf), result); |
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663 if (result == OS_ERR) { |
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664 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
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665 continue; |
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666 } |
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|
667 |
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668 // skip over files that are not regular files. |
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669 if (!S_ISREG(statbuf.st_mode)) { |
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670 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
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671 continue; |
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|
672 } |
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|
673 |
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674 // compare and save filename with latest creation time |
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675 if (statbuf.st_size > 0 && statbuf.st_ctime > oldest_ctime) { |
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|
676 |
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677 if (statbuf.st_ctime > oldest_ctime) { |
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678 char* user = strchr(dentry->d_name, '_') + 1; |
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679 |
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|
680 if (oldest_user != NULL) FREE_C_HEAP_ARRAY(char, oldest_user, mtInternal); |
666e6ce3976c
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681 oldest_user = NEW_C_HEAP_ARRAY(char, strlen(user)+1, mtInternal); |
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|
682 |
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|
683 strcpy(oldest_user, user); |
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684 oldest_ctime = statbuf.st_ctime; |
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|
685 } |
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|
686 } |
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|
687 |
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|
688 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
666e6ce3976c
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|
689 } |
666e6ce3976c
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diff
changeset
|
690 } |
666e6ce3976c
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diff
changeset
|
691 os::closedir(subdirp); |
666e6ce3976c
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changeset
|
692 FREE_C_HEAP_ARRAY(char, udbuf, mtInternal); |
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693 FREE_C_HEAP_ARRAY(char, usrdir_name, mtInternal); |
666e6ce3976c
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|
694 } |
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|
695 os::closedir(tmpdirp); |
666e6ce3976c
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diff
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|
696 FREE_C_HEAP_ARRAY(char, tdbuf, mtInternal); |
666e6ce3976c
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|
697 |
666e6ce3976c
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|
698 return(oldest_user); |
666e6ce3976c
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diff
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|
699 } |
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|
700 |
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|
701 // return the name of the user that owns the JVM indicated by the given vmid. |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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|
702 // |
666e6ce3976c
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|
703 static char* get_user_name(int vmid, TRAPS) { |
666e6ce3976c
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diff
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|
704 return get_user_name_slow(vmid, CHECK_NULL); |
666e6ce3976c
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simonis
parents:
diff
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|
705 } |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
parents:
diff
changeset
|
706 |
666e6ce3976c
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parents:
diff
changeset
|
707 // return the file name of the backing store file for the named |
666e6ce3976c
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diff
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|
708 // shared memory region for the given user name and vmid. |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
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diff
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|
709 // |
666e6ce3976c
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diff
changeset
|
710 // the caller is expected to free the allocated memory. |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
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diff
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|
711 // |
666e6ce3976c
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diff
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|
712 static char* get_sharedmem_filename(const char* dirname, int vmid) { |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
parents:
diff
changeset
|
713 |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
parents:
diff
changeset
|
714 // add 2 for the file separator and a null terminator. |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff
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|
715 size_t nbytes = strlen(dirname) + UINT_CHARS + 2; |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
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diff
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|
716 |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff
changeset
|
717 char* name = NEW_C_HEAP_ARRAY(char, nbytes, mtInternal); |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff
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|
718 snprintf(name, nbytes, "%s/%d", dirname, vmid); |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
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diff
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|
719 |
666e6ce3976c
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diff
changeset
|
720 return name; |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
parents:
diff
changeset
|
721 } |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
parents:
diff
changeset
|
722 |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
parents:
diff
changeset
|
723 |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
parents:
diff
changeset
|
724 // remove file |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
parents:
diff
changeset
|
725 // |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff
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|
726 // this method removes the file specified by the given path |
666e6ce3976c
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diff
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|
727 // |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff
changeset
|
728 static void remove_file(const char* path) { |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
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diff
changeset
|
729 |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff
changeset
|
730 int result; |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
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diff
changeset
|
731 |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff
changeset
|
732 // if the file is a directory, the following unlink will fail. since |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff
changeset
|
733 // we don't expect to find directories in the user temp directory, we |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff
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|
734 // won't try to handle this situation. even if accidentially or |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff
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|
735 // maliciously planted, the directory's presence won't hurt anything. |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff
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|
736 // |
666e6ce3976c
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|
737 RESTARTABLE(::unlink(path), result); |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff
changeset
|
738 if (PrintMiscellaneous && Verbose && result == OS_ERR) { |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff
changeset
|
739 if (errno != ENOENT) { |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff
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|
740 warning("Could not unlink shared memory backing" |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff
changeset
|
741 " store file %s : %s\n", path, strerror(errno)); |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff
changeset
|
742 } |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
parents:
diff
changeset
|
743 } |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
parents:
diff
changeset
|
744 } |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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parents:
diff
changeset
|
745 |
20801
b9c06f87e476
8069590: AIX port of "8050807: Better performing performance data handling"
goetz
parents:
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diff
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|
746 // Cleanup stale shared memory resources |
14415
666e6ce3976c
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diff
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|
747 // |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff
changeset
|
748 // This method attempts to remove all stale shared memory files in |
666e6ce3976c
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diff
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|
749 // the named user temporary directory. It scans the named directory |
666e6ce3976c
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diff
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|
750 // for files matching the pattern ^$[0-9]*$. For each file found, the |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff
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|
751 // process id is extracted from the file name and a test is run to |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff
changeset
|
752 // determine if the process is alive. If the process is not alive, |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff
changeset
|
753 // any stale file resources are removed. |
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8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff
changeset
|
754 static void cleanup_sharedmem_resources(const char* dirname) { |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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parents:
diff
changeset
|
755 |
20801
b9c06f87e476
8069590: AIX port of "8050807: Better performing performance data handling"
goetz
parents:
14415
diff
changeset
|
756 int saved_cwd_fd; |
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8069590: AIX port of "8050807: Better performing performance data handling"
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parents:
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|
757 // Open the directory. |
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758 DIR* dirp = open_directory_secure_cwd(dirname, &saved_cwd_fd); |
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759 if (dirp == NULL) { |
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760 // Directory doesn't exist or is insecure, so there is nothing to cleanup. |
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761 return; |
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|
762 } |
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|
763 |
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764 // For each entry in the directory that matches the expected file |
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765 // name pattern, determine if the file resources are stale and if |
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|
766 // so, remove the file resources. Note, instrumented HotSpot processes |
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767 // for this user may start and/or terminate during this search and |
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768 // remove or create new files in this directory. The behavior of this |
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769 // loop under these conditions is dependent upon the implementation of |
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|
770 // opendir/readdir. |
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|
771 struct dirent* entry; |
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772 char* dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(dirname), mtInternal); |
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773 |
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774 errno = 0; |
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775 while ((entry = os::readdir(dirp, (struct dirent *)dbuf)) != NULL) { |
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|
776 |
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777 pid_t pid = filename_to_pid(entry->d_name); |
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|
778 |
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|
779 if (pid == 0) { |
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|
780 |
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781 if (strcmp(entry->d_name, ".") != 0 && strcmp(entry->d_name, "..") != 0) { |
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|
782 |
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783 // Attempt to remove all unexpected files, except "." and "..". |
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784 unlink(entry->d_name); |
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|
785 } |
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|
786 |
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|
787 errno = 0; |
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|
788 continue; |
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|
789 } |
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|
790 |
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791 // We now have a file name that converts to a valid integer |
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792 // that could represent a process id . if this process id |
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793 // matches the current process id or the process is not running, |
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|
794 // then remove the stale file resources. |
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|
795 // |
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796 // Process liveness is detected by sending signal number 0 to |
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|
797 // the process id (see kill(2)). if kill determines that the |
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|
798 // process does not exist, then the file resources are removed. |
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|
799 // if kill determines that that we don't have permission to |
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|
800 // signal the process, then the file resources are assumed to |
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|
801 // be stale and are removed because the resources for such a |
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|
802 // process should be in a different user specific directory. |
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|
803 if ((pid == os::current_process_id()) || |
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|
804 (kill(pid, 0) == OS_ERR && (errno == ESRCH || errno == EPERM))) { |
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|
805 |
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806 unlink(entry->d_name); |
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|
807 } |
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|
808 errno = 0; |
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|
809 } |
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|
810 |
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811 // Close the directory and reset the current working directory. |
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812 close_directory_secure_cwd(dirp, saved_cwd_fd); |
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|
813 |
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|
814 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); |
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|
815 } |
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|
816 |
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817 // Make the user specific temporary directory. Returns true if |
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|
818 // the directory exists and is secure upon return. Returns false |
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819 // if the directory exists but is either a symlink, is otherwise |
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|
820 // insecure, or if an error occurred. |
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|
821 static bool make_user_tmp_dir(const char* dirname) { |
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|
822 |
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|
823 // Create the directory with 0755 permissions. note that the directory |
14415
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|
824 // will be owned by euid::egid, which may not be the same as uid::gid. |
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825 if (mkdir(dirname, S_IRWXU|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH) == OS_ERR) { |
666e6ce3976c
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|
826 if (errno == EEXIST) { |
666e6ce3976c
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|
827 // The directory already exists and was probably created by another |
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|
828 // JVM instance. However, this could also be the result of a |
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|
829 // deliberate symlink. Verify that the existing directory is safe. |
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|
830 if (!is_directory_secure(dirname)) { |
20801
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|
831 // Directory is not secure. |
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changeset
|
832 if (PrintMiscellaneous && Verbose) { |
666e6ce3976c
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diff
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|
833 warning("%s directory is insecure\n", dirname); |
666e6ce3976c
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diff
changeset
|
834 } |
666e6ce3976c
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diff
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|
835 return false; |
666e6ce3976c
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parents:
diff
changeset
|
836 } |
666e6ce3976c
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parents:
diff
changeset
|
837 } |
666e6ce3976c
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diff
changeset
|
838 else { |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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parents:
diff
changeset
|
839 // we encountered some other failure while attempting |
666e6ce3976c
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simonis
parents:
diff
changeset
|
840 // to create the directory |
666e6ce3976c
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simonis
parents:
diff
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|
841 // |
666e6ce3976c
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parents:
diff
changeset
|
842 if (PrintMiscellaneous && Verbose) { |
666e6ce3976c
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diff
changeset
|
843 warning("could not create directory %s: %s\n", |
666e6ce3976c
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simonis
parents:
diff
changeset
|
844 dirname, strerror(errno)); |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
parents:
diff
changeset
|
845 } |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
parents:
diff
changeset
|
846 return false; |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
parents:
diff
changeset
|
847 } |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
parents:
diff
changeset
|
848 } |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
parents:
diff
changeset
|
849 return true; |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
parents:
diff
changeset
|
850 } |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
parents:
diff
changeset
|
851 |
666e6ce3976c
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parents:
diff
changeset
|
852 // create the shared memory file resources |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff
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|
853 // |
666e6ce3976c
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diff
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|
854 // This method creates the shared memory file with the given size |
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diff
changeset
|
855 // This method also creates the user specific temporary directory, if |
666e6ce3976c
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diff
changeset
|
856 // it does not yet exist. |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
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diff
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|
857 // |
666e6ce3976c
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diff
changeset
|
858 static int create_sharedmem_resources(const char* dirname, const char* filename, size_t size) { |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
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diff
changeset
|
859 |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff
changeset
|
860 // make the user temporary directory |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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parents:
diff
changeset
|
861 if (!make_user_tmp_dir(dirname)) { |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
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diff
changeset
|
862 // could not make/find the directory or the found directory |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
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diff
changeset
|
863 // was not secure |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff
changeset
|
864 return -1; |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
parents:
diff
changeset
|
865 } |
666e6ce3976c
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diff
changeset
|
866 |
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|
867 int saved_cwd_fd; |
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|
868 // Open the directory and set the current working directory to it. |
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|
869 DIR* dirp = open_directory_secure_cwd(dirname, &saved_cwd_fd); |
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|
870 if (dirp == NULL) { |
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|
871 // Directory doesn't exist or is insecure, so cannot create shared |
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|
872 // memory file. |
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parents:
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diff
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|
873 return -1; |
b9c06f87e476
8069590: AIX port of "8050807: Better performing performance data handling"
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parents:
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diff
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|
874 } |
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8069590: AIX port of "8050807: Better performing performance data handling"
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parents:
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diff
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|
875 |
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|
876 // Open the filename in the current directory. |
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|
877 // Cannot use O_TRUNC here; truncation of an existing file has to happen |
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|
878 // after the is_file_secure() check below. |
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|
879 int result; |
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changeset
|
880 |
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|
881 // No O_NOFOLLOW defined at buildtime, and it is not documented for open; |
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|
882 // so provide a workaround in this case. |
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883 #ifdef O_NOFOLLOW |
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884 RESTARTABLE(::open(filename, O_RDWR|O_CREAT|O_NOFOLLOW, S_IREAD|S_IWRITE), result); |
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|
885 #else |
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|
886 // workaround function (jdk6 code) |
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|
887 RESTARTABLE(::open_o_nofollow(filename, O_RDWR|O_CREAT, S_IREAD|S_IWRITE), result); |
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|
888 #endif |
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|
889 |
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|
890 if (result == OS_ERR) { |
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|
891 if (PrintMiscellaneous && Verbose) { |
20801
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892 if (errno == ELOOP) { |
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893 warning("file %s is a symlink and is not secure\n", filename); |
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|
894 } else { |
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|
895 warning("could not create file %s: %s\n", filename, strerror(errno)); |
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|
896 } |
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|
897 } |
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|
898 // Close the directory and reset the current working directory. |
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|
899 close_directory_secure_cwd(dirp, saved_cwd_fd); |
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|
900 |
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|
901 return -1; |
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|
902 } |
20801
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|
903 // Close the directory and reset the current working directory. |
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|
904 close_directory_secure_cwd(dirp, saved_cwd_fd); |
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|
905 |
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|
906 // save the file descriptor |
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|
907 int fd = result; |
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|
908 |
20801
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|
909 // Check to see if the file is secure. |
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|
910 if (!is_file_secure(fd, filename)) { |
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|
911 ::close(fd); |
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|
912 return -1; |
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|
913 } |
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|
914 |
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|
915 // Truncate the file to get rid of any existing data. |
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|
916 RESTARTABLE(::ftruncate(fd, (off_t)0), result); |
b9c06f87e476
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|
917 if (result == OS_ERR) { |
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|
918 if (PrintMiscellaneous && Verbose) { |
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|
919 warning("could not truncate shared memory file: %s\n", strerror(errno)); |
b9c06f87e476
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|
920 } |
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parents:
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|
921 ::close(fd); |
b9c06f87e476
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parents:
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|
922 return -1; |
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|
923 } |
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|
924 // set the file size |
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|
925 RESTARTABLE(::ftruncate(fd, (off_t)size), result); |
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|
926 if (result == OS_ERR) { |
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|
927 if (PrintMiscellaneous && Verbose) { |
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|
928 warning("could not set shared memory file size: %s\n", strerror(errno)); |
666e6ce3976c
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|
929 } |
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|
930 RESTARTABLE(::close(fd), result); |
666e6ce3976c
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|
931 return -1; |
666e6ce3976c
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diff
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|
932 } |
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|
933 |
666e6ce3976c
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|
934 return fd; |
666e6ce3976c
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parents:
diff
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|
935 } |
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|
936 |
666e6ce3976c
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|
937 // open the shared memory file for the given user and vmid. returns |
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|
938 // the file descriptor for the open file or -1 if the file could not |
666e6ce3976c
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|
939 // be opened. |
666e6ce3976c
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|
940 // |
666e6ce3976c
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|
941 static int open_sharedmem_file(const char* filename, int oflags, TRAPS) { |
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|
942 |
666e6ce3976c
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|
943 // open the file |
666e6ce3976c
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|
944 int result; |
20801
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945 // No O_NOFOLLOW defined at buildtime, and it is not documented for open; |
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|
946 // so provide a workaround in this case |
b9c06f87e476
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|
947 #ifdef O_NOFOLLOW |
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|
948 RESTARTABLE(::open(filename, oflags), result); |
20801
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|
949 #else |
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|
950 RESTARTABLE(::open_o_nofollow(filename, oflags), result); |
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|
951 #endif |
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|
952 |
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|
953 if (result == OS_ERR) { |
666e6ce3976c
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|
954 if (errno == ENOENT) { |
666e6ce3976c
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|
955 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), |
666e6ce3976c
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|
956 "Process not found"); |
666e6ce3976c
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parents:
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|
957 } |
666e6ce3976c
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|
958 else if (errno == EACCES) { |
666e6ce3976c
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|
959 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), |
666e6ce3976c
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|
960 "Permission denied"); |
666e6ce3976c
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parents:
diff
changeset
|
961 } |
666e6ce3976c
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|
962 else { |
666e6ce3976c
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|
963 THROW_MSG_0(vmSymbols::java_io_IOException(), strerror(errno)); |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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|
964 } |
666e6ce3976c
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parents:
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|
965 } |
20801
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|
966 int fd = result; |
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|
967 |
20801
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|
968 // Check to see if the file is secure. |
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|
969 if (!is_file_secure(fd, filename)) { |
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|
970 ::close(fd); |
b9c06f87e476
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parents:
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|
971 return -1; |
b9c06f87e476
8069590: AIX port of "8050807: Better performing performance data handling"
goetz
parents:
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diff
changeset
|
972 } |
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|
973 |
b9c06f87e476
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|
974 return fd; |
14415
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diff
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|
975 } |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff
changeset
|
976 |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
parents:
diff
changeset
|
977 // create a named shared memory region. returns the address of the |
666e6ce3976c
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|
978 // memory region on success or NULL on failure. A return value of |
666e6ce3976c
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|
979 // NULL will ultimately disable the shared memory feature. |
666e6ce3976c
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|
980 // |
666e6ce3976c
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|
981 // On Solaris and Linux, the name space for shared memory objects |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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changeset
|
982 // is the file system name space. |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff
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|
983 // |
666e6ce3976c
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parents:
diff
changeset
|
984 // A monitoring application attaching to a JVM does not need to know |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
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diff
changeset
|
985 // the file system name of the shared memory object. However, it may |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
parents:
diff
changeset
|
986 // be convenient for applications to discover the existence of newly |
666e6ce3976c
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diff
changeset
|
987 // created and terminating JVMs by watching the file system name space |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
parents:
diff
changeset
|
988 // for files being created or removed. |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
parents:
diff
changeset
|
989 // |
666e6ce3976c
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parents:
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changeset
|
990 static char* mmap_create_shared(size_t size) { |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
parents:
diff
changeset
|
991 |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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parents:
diff
changeset
|
992 int result; |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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parents:
diff
changeset
|
993 int fd; |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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parents:
diff
changeset
|
994 char* mapAddress; |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
parents:
diff
changeset
|
995 |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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parents:
diff
changeset
|
996 int vmid = os::current_process_id(); |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
parents:
diff
changeset
|
997 |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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parents:
diff
changeset
|
998 char* user_name = get_user_name(geteuid()); |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
parents:
diff
changeset
|
999 |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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parents:
diff
changeset
|
1000 if (user_name == NULL) |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
parents:
diff
changeset
|
1001 return NULL; |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
simonis
parents:
diff
changeset
|
1002 |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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parents:
diff
changeset
|
1003 char* dirname = get_user_tmp_dir(user_name); |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff
changeset
|
1004 char* filename = get_sharedmem_filename(dirname, vmid); |
666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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parents:
diff
changeset
|
1005 |
20801
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|
1006 // Get the short filename. |
b9c06f87e476
8069590: AIX port of "8050807: Better performing performance data handling"
goetz
parents:
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diff
changeset
|
1007 char* short_filename = strrchr(filename, '/'); |
b9c06f87e476
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parents:
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changeset
|
1008 if (short_filename == NULL) { |
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1009 short_filename = filename; |
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1010 } else { |
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1011 short_filename++; |
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1012 } |
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1013 |
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1014 // cleanup any stale shared memory files |
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1015 cleanup_sharedmem_resources(dirname); |
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1016 |
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1017 assert(((size > 0) && (size % os::vm_page_size() == 0)), |
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1018 "unexpected PerfMemory region size"); |
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1019 |
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1020 fd = create_sharedmem_resources(dirname, short_filename, size); |
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1021 |
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1022 FREE_C_HEAP_ARRAY(char, user_name, mtInternal); |
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1023 FREE_C_HEAP_ARRAY(char, dirname, mtInternal); |
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1024 |
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1025 if (fd == -1) { |
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1026 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
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1027 return NULL; |
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1028 } |
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1029 |
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1030 mapAddress = (char*)::mmap((char*)0, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0); |
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1031 |
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1032 // attempt to close the file - restart it if it was interrupted, |
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1033 // but ignore other failures |
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1034 RESTARTABLE(::close(fd), result); |
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1035 assert(result != OS_ERR, "could not close file"); |
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1036 |
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1037 if (mapAddress == MAP_FAILED) { |
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1038 if (PrintMiscellaneous && Verbose) { |
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1039 warning("mmap failed - %s\n", strerror(errno)); |
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1040 } |
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1041 remove_file(filename); |
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1042 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
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1043 return NULL; |
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1044 } |
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1045 |
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1046 // save the file name for use in delete_shared_memory() |
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1047 backing_store_file_name = filename; |
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1048 |
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1049 // clear the shared memory region |
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1050 (void)::memset((void*) mapAddress, 0, size); |
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1051 |
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1052 // It does not go through os api, the operation has to record from here. |
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1053 MemTracker::record_virtual_memory_reserve((address)mapAddress, size, CURRENT_PC, mtInternal); |
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1054 |
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1055 return mapAddress; |
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1056 } |
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1057 |
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1058 // release a named shared memory region |
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1059 // |
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1060 static void unmap_shared(char* addr, size_t bytes) { |
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1061 // Do not rely on os::reserve_memory/os::release_memory to use mmap. |
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1062 // Use os::reserve_memory/os::release_memory for PerfDisableSharedMem=1, mmap/munmap for PerfDisableSharedMem=0 |
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1063 if (::munmap(addr, bytes) == -1) { |
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1064 warning("perfmemory: munmap failed (%d)\n", errno); |
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1065 } |
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1066 } |
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1067 |
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1068 // create the PerfData memory region in shared memory. |
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1069 // |
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1070 static char* create_shared_memory(size_t size) { |
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1071 |
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1072 // create the shared memory region. |
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1073 return mmap_create_shared(size); |
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1074 } |
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1075 |
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1076 // delete the shared PerfData memory region |
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1077 // |
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1078 static void delete_shared_memory(char* addr, size_t size) { |
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1079 |
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1080 // cleanup the persistent shared memory resources. since DestroyJavaVM does |
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1081 // not support unloading of the JVM, unmapping of the memory resource is |
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1082 // not performed. The memory will be reclaimed by the OS upon termination of |
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1083 // the process. The backing store file is deleted from the file system. |
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1084 |
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1085 assert(!PerfDisableSharedMem, "shouldn't be here"); |
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1086 |
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1087 if (backing_store_file_name != NULL) { |
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1088 remove_file(backing_store_file_name); |
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1089 // Don't.. Free heap memory could deadlock os::abort() if it is called |
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1090 // from signal handler. OS will reclaim the heap memory. |
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1091 // FREE_C_HEAP_ARRAY(char, backing_store_file_name, mtInternal); |
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1092 backing_store_file_name = NULL; |
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1093 } |
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1094 } |
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1095 |
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1096 // return the size of the file for the given file descriptor |
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1097 // or 0 if it is not a valid size for a shared memory file |
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1098 // |
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1099 static size_t sharedmem_filesize(int fd, TRAPS) { |
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1100 |
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1101 struct stat statbuf; |
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1102 int result; |
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1103 |
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1104 RESTARTABLE(::fstat(fd, &statbuf), result); |
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1105 if (result == OS_ERR) { |
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1106 if (PrintMiscellaneous && Verbose) { |
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1107 warning("fstat failed: %s\n", strerror(errno)); |
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1108 } |
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1109 THROW_MSG_0(vmSymbols::java_io_IOException(), |
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1110 "Could not determine PerfMemory size"); |
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1111 } |
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1112 |
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1113 if ((statbuf.st_size == 0) || |
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1114 ((size_t)statbuf.st_size % os::vm_page_size() != 0)) { |
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1115 THROW_MSG_0(vmSymbols::java_lang_Exception(), |
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1116 "Invalid PerfMemory size"); |
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1117 } |
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1118 |
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1119 return (size_t)statbuf.st_size; |
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1120 } |
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1121 |
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1122 // attach to a named shared memory region. |
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1123 // |
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1124 static void mmap_attach_shared(const char* user, int vmid, PerfMemory::PerfMemoryMode mode, char** addr, size_t* sizep, TRAPS) { |
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1125 |
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1126 char* mapAddress; |
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1127 int result; |
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1128 int fd; |
20801
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1129 size_t size = 0; |
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1130 const char* luser = NULL; |
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1131 |
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1132 int mmap_prot; |
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1133 int file_flags; |
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1134 |
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1135 ResourceMark rm; |
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1136 |
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1137 // map the high level access mode to the appropriate permission |
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1138 // constructs for the file and the shared memory mapping. |
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1139 if (mode == PerfMemory::PERF_MODE_RO) { |
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1140 mmap_prot = PROT_READ; |
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1141 |
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1142 // No O_NOFOLLOW defined at buildtime, and it is not documented for open. |
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1143 #ifdef O_NOFOLLOW |
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1144 file_flags = O_RDONLY | O_NOFOLLOW; |
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1145 #else |
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1146 file_flags = O_RDONLY; |
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1147 #endif |
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1148 } |
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1149 else if (mode == PerfMemory::PERF_MODE_RW) { |
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1150 #ifdef LATER |
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1151 mmap_prot = PROT_READ | PROT_WRITE; |
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1152 file_flags = O_RDWR | O_NOFOLLOW; |
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1153 #else |
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1154 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), |
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1155 "Unsupported access mode"); |
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1156 #endif |
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1157 } |
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1158 else { |
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1159 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), |
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1160 "Illegal access mode"); |
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1161 } |
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1162 |
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1163 if (user == NULL || strlen(user) == 0) { |
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1164 luser = get_user_name(vmid, CHECK); |
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1165 } |
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1166 else { |
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1167 luser = user; |
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1168 } |
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1169 |
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1170 if (luser == NULL) { |
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1171 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), |
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1172 "Could not map vmid to user Name"); |
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1173 } |
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1174 |
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1175 char* dirname = get_user_tmp_dir(luser); |
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1176 |
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1177 // since we don't follow symbolic links when creating the backing |
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1178 // store file, we don't follow them when attaching either. |
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1179 // |
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1180 if (!is_directory_secure(dirname)) { |
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1181 FREE_C_HEAP_ARRAY(char, dirname, mtInternal); |
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1182 if (luser != user) { |
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1183 FREE_C_HEAP_ARRAY(char, luser, mtInternal); |
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1184 } |
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1185 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), |
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1186 "Process not found"); |
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1187 } |
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1188 |
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1189 char* filename = get_sharedmem_filename(dirname, vmid); |
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1190 |
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1191 // copy heap memory to resource memory. the open_sharedmem_file |
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1192 // method below need to use the filename, but could throw an |
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1193 // exception. using a resource array prevents the leak that |
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1194 // would otherwise occur. |
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1195 char* rfilename = NEW_RESOURCE_ARRAY(char, strlen(filename) + 1); |
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1196 strcpy(rfilename, filename); |
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1197 |
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1198 // free the c heap resources that are no longer needed |
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1199 if (luser != user) FREE_C_HEAP_ARRAY(char, luser, mtInternal); |
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1200 FREE_C_HEAP_ARRAY(char, dirname, mtInternal); |
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1201 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
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1202 |
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1203 // open the shared memory file for the give vmid |
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1204 fd = open_sharedmem_file(rfilename, file_flags, CHECK); |
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1205 assert(fd != OS_ERR, "unexpected value"); |
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1206 |
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1207 if (*sizep == 0) { |
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1208 size = sharedmem_filesize(fd, CHECK); |
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1209 assert(size != 0, "unexpected size"); |
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1210 } else { |
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1211 size = *sizep; |
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|
1212 } |
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1213 |
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1214 mapAddress = (char*)::mmap((char*)0, size, mmap_prot, MAP_SHARED, fd, 0); |
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1215 |
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1216 // attempt to close the file - restart if it gets interrupted, |
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1217 // but ignore other failures |
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1218 RESTARTABLE(::close(fd), result); |
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1219 assert(result != OS_ERR, "could not close file"); |
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1220 |
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1221 if (mapAddress == MAP_FAILED) { |
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1222 if (PrintMiscellaneous && Verbose) { |
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1223 warning("mmap failed: %s\n", strerror(errno)); |
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1224 } |
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1225 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), |
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|
1226 "Could not map PerfMemory"); |
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|
1227 } |
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|
1228 |
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1229 // It does not go through os api, the operation has to record from here. |
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1230 MemTracker::record_virtual_memory_reserve((address)mapAddress, size, CURRENT_PC, mtInternal); |
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1231 |
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1232 *addr = mapAddress; |
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1233 *sizep = size; |
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|
1234 |
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|
1235 if (PerfTraceMemOps) { |
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1236 tty->print("mapped " SIZE_FORMAT " bytes for vmid %d at " |
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1237 INTPTR_FORMAT "\n", size, vmid, (void*)mapAddress); |
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|
1238 } |
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|
1239 } |
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|
1240 |
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|
1241 |
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|
1242 |
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|
1243 |
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|
1244 // create the PerfData memory region |
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|
1245 // |
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1246 // This method creates the memory region used to store performance |
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1247 // data for the JVM. The memory may be created in standard or |
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1248 // shared memory. |
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|
1249 // |
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|
1250 void PerfMemory::create_memory_region(size_t size) { |
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|
1251 |
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1252 if (PerfDisableSharedMem) { |
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1253 // do not share the memory for the performance data. |
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|
1254 _start = create_standard_memory(size); |
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|
1255 } |
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|
1256 else { |
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|
1257 _start = create_shared_memory(size); |
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|
1258 if (_start == NULL) { |
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|
1259 |
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|
1260 // creation of the shared memory region failed, attempt |
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|
1261 // to create a contiguous, non-shared memory region instead. |
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1262 // |
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1263 if (PrintMiscellaneous && Verbose) { |
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1264 warning("Reverting to non-shared PerfMemory region.\n"); |
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1265 } |
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1266 PerfDisableSharedMem = true; |
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1267 _start = create_standard_memory(size); |
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1268 } |
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1269 } |
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1270 |
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1271 if (_start != NULL) _capacity = size; |
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1272 |
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1273 } |
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1274 |
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1275 // delete the PerfData memory region |
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1276 // |
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1277 // This method deletes the memory region used to store performance |
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1278 // data for the JVM. The memory region indicated by the <address, size> |
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1279 // tuple will be inaccessible after a call to this method. |
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1280 // |
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1281 void PerfMemory::delete_memory_region() { |
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1282 |
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1283 assert((start() != NULL && capacity() > 0), "verify proper state"); |
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1284 |
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1285 // If user specifies PerfDataSaveFile, it will save the performance data |
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1286 // to the specified file name no matter whether PerfDataSaveToFile is specified |
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1287 // or not. In other word, -XX:PerfDataSaveFile=.. overrides flag |
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1288 // -XX:+PerfDataSaveToFile. |
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1289 if (PerfDataSaveToFile || PerfDataSaveFile != NULL) { |
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1290 save_memory_to_file(start(), capacity()); |
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1291 } |
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1292 |
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1293 if (PerfDisableSharedMem) { |
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1294 delete_standard_memory(start(), capacity()); |
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1295 } |
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1296 else { |
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1297 delete_shared_memory(start(), capacity()); |
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1298 } |
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1299 } |
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1300 |
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1301 // attach to the PerfData memory region for another JVM |
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1302 // |
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1303 // This method returns an <address, size> tuple that points to |
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1304 // a memory buffer that is kept reasonably synchronized with |
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1305 // the PerfData memory region for the indicated JVM. This |
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1306 // buffer may be kept in synchronization via shared memory |
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1307 // or some other mechanism that keeps the buffer updated. |
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1308 // |
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1309 // If the JVM chooses not to support the attachability feature, |
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1310 // this method should throw an UnsupportedOperation exception. |
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1311 // |
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1312 // This implementation utilizes named shared memory to map |
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1313 // the indicated process's PerfData memory region into this JVMs |
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1314 // address space. |
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1315 // |
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1316 void PerfMemory::attach(const char* user, int vmid, PerfMemoryMode mode, char** addrp, size_t* sizep, TRAPS) { |
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1317 |
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1318 if (vmid == 0 || vmid == os::current_process_id()) { |
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1319 *addrp = start(); |
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1320 *sizep = capacity(); |
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1321 return; |
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1322 } |
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1323 |
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1324 mmap_attach_shared(user, vmid, mode, addrp, sizep, CHECK); |
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1325 } |
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1326 |
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1327 // detach from the PerfData memory region of another JVM |
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1328 // |
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1329 // This method detaches the PerfData memory region of another |
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1330 // JVM, specified as an <address, size> tuple of a buffer |
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1331 // in this process's address space. This method may perform |
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1332 // arbitrary actions to accomplish the detachment. The memory |
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1333 // region specified by <address, size> will be inaccessible after |
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1334 // a call to this method. |
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1335 // |
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1336 // If the JVM chooses not to support the attachability feature, |
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1337 // this method should throw an UnsupportedOperation exception. |
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1338 // |
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1339 // This implementation utilizes named shared memory to detach |
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1340 // the indicated process's PerfData memory region from this |
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1341 // process's address space. |
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1342 // |
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1343 void PerfMemory::detach(char* addr, size_t bytes, TRAPS) { |
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1344 |
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1345 assert(addr != 0, "address sanity check"); |
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1346 assert(bytes > 0, "capacity sanity check"); |
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1347 |
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1348 if (PerfMemory::contains(addr) || PerfMemory::contains(addr + bytes - 1)) { |
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1349 // prevent accidental detachment of this process's PerfMemory region |
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1350 return; |
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1351 } |
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1352 |
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1353 unmap_shared(addr, bytes); |
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1354 } |
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1355 |
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1356 char* PerfMemory::backing_store_filename() { |
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1357 return backing_store_file_name; |
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1358 } |