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1 //===-- tsan_platform_linux.cc --------------------------------------------===//
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2 //
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3 // This file is distributed under the University of Illinois Open Source
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4 // License. See LICENSE.TXT for details.
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5 //
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6 //===----------------------------------------------------------------------===//
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7 //
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8 // This file is a part of ThreadSanitizer (TSan), a race detector.
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9 //
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10 // Linux- and FreeBSD-specific code.
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11 //===----------------------------------------------------------------------===//
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12
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13
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14 #include "sanitizer_common/sanitizer_platform.h"
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15 #if SANITIZER_LINUX || SANITIZER_FREEBSD
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16
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17 #include "sanitizer_common/sanitizer_common.h"
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18 #include "sanitizer_common/sanitizer_libc.h"
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19 #include "sanitizer_common/sanitizer_linux.h"
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20 #include "sanitizer_common/sanitizer_platform_limits_posix.h"
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21 #include "sanitizer_common/sanitizer_posix.h"
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22 #include "sanitizer_common/sanitizer_procmaps.h"
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23 #include "sanitizer_common/sanitizer_stoptheworld.h"
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24 #include "sanitizer_common/sanitizer_stackdepot.h"
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25 #include "tsan_platform.h"
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26 #include "tsan_rtl.h"
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27 #include "tsan_flags.h"
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28
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29 #include <fcntl.h>
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30 #include <pthread.h>
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31 #include <signal.h>
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32 #include <stdio.h>
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33 #include <stdlib.h>
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34 #include <string.h>
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35 #include <stdarg.h>
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36 #include <sys/mman.h>
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37 #if SANITIZER_LINUX
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38 #include <sys/personality.h>
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39 #include <setjmp.h>
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40 #endif
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41 #include <sys/syscall.h>
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42 #include <sys/socket.h>
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43 #include <sys/time.h>
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44 #include <sys/types.h>
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45 #include <sys/resource.h>
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46 #include <sys/stat.h>
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47 #include <unistd.h>
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48 #include <sched.h>
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49 #include <dlfcn.h>
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50 #if SANITIZER_LINUX
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51 #define __need_res_state
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52 #include <resolv.h>
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53 #endif
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54
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55 #ifdef sa_handler
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56 # undef sa_handler
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57 #endif
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58
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59 #ifdef sa_sigaction
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60 # undef sa_sigaction
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61 #endif
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62
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63 #if SANITIZER_FREEBSD
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64 extern "C" void *__libc_stack_end;
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65 void *__libc_stack_end = 0;
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66 #endif
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67
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68 #if SANITIZER_LINUX && defined(__aarch64__)
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69 void InitializeGuardPtr() __attribute__((visibility("hidden")));
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70 #endif
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71
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72 namespace __tsan {
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73
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74 #ifdef TSAN_RUNTIME_VMA
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75 // Runtime detected VMA size.
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76 uptr vmaSize;
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77 #endif
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78
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79 enum {
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80 MemTotal = 0,
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81 MemShadow = 1,
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82 MemMeta = 2,
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83 MemFile = 3,
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84 MemMmap = 4,
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85 MemTrace = 5,
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86 MemHeap = 6,
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87 MemOther = 7,
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88 MemCount = 8,
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89 };
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90
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91 void FillProfileCallback(uptr p, uptr rss, bool file,
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92 uptr *mem, uptr stats_size) {
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93 mem[MemTotal] += rss;
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94 if (p >= ShadowBeg() && p < ShadowEnd())
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95 mem[MemShadow] += rss;
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96 else if (p >= MetaShadowBeg() && p < MetaShadowEnd())
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97 mem[MemMeta] += rss;
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98 #if !SANITIZER_GO
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99 else if (p >= HeapMemBeg() && p < HeapMemEnd())
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100 mem[MemHeap] += rss;
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101 else if (p >= LoAppMemBeg() && p < LoAppMemEnd())
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102 mem[file ? MemFile : MemMmap] += rss;
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103 else if (p >= HiAppMemBeg() && p < HiAppMemEnd())
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104 mem[file ? MemFile : MemMmap] += rss;
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105 #else
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106 else if (p >= AppMemBeg() && p < AppMemEnd())
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107 mem[file ? MemFile : MemMmap] += rss;
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108 #endif
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109 else if (p >= TraceMemBeg() && p < TraceMemEnd())
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110 mem[MemTrace] += rss;
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111 else
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112 mem[MemOther] += rss;
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113 }
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114
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115 void WriteMemoryProfile(char *buf, uptr buf_size, uptr nthread, uptr nlive) {
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116 uptr mem[MemCount];
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117 internal_memset(mem, 0, sizeof(mem[0]) * MemCount);
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118 __sanitizer::GetMemoryProfile(FillProfileCallback, mem, 7);
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119 StackDepotStats *stacks = StackDepotGetStats();
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120 internal_snprintf(buf, buf_size,
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121 "RSS %zd MB: shadow:%zd meta:%zd file:%zd mmap:%zd"
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122 " trace:%zd heap:%zd other:%zd stacks=%zd[%zd] nthr=%zd/%zd\n",
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123 mem[MemTotal] >> 20, mem[MemShadow] >> 20, mem[MemMeta] >> 20,
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124 mem[MemFile] >> 20, mem[MemMmap] >> 20, mem[MemTrace] >> 20,
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125 mem[MemHeap] >> 20, mem[MemOther] >> 20,
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126 stacks->allocated >> 20, stacks->n_uniq_ids,
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127 nlive, nthread);
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128 }
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129
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130 #if SANITIZER_LINUX
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131 void FlushShadowMemoryCallback(
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132 const SuspendedThreadsList &suspended_threads_list,
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133 void *argument) {
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134 ReleaseMemoryPagesToOS(ShadowBeg(), ShadowEnd());
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135 }
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136 #endif
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137
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138 void FlushShadowMemory() {
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139 #if SANITIZER_LINUX
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140 StopTheWorld(FlushShadowMemoryCallback, 0);
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141 #endif
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142 }
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143
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144 #if !SANITIZER_GO
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145 // Mark shadow for .rodata sections with the special kShadowRodata marker.
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146 // Accesses to .rodata can't race, so this saves time, memory and trace space.
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147 static void MapRodata() {
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148 // First create temp file.
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149 const char *tmpdir = GetEnv("TMPDIR");
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150 if (tmpdir == 0)
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151 tmpdir = GetEnv("TEST_TMPDIR");
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152 #ifdef P_tmpdir
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153 if (tmpdir == 0)
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154 tmpdir = P_tmpdir;
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155 #endif
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156 if (tmpdir == 0)
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157 return;
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158 char name[256];
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159 internal_snprintf(name, sizeof(name), "%s/tsan.rodata.%d",
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160 tmpdir, (int)internal_getpid());
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161 uptr openrv = internal_open(name, O_RDWR | O_CREAT | O_EXCL, 0600);
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162 if (internal_iserror(openrv))
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163 return;
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164 internal_unlink(name); // Unlink it now, so that we can reuse the buffer.
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165 fd_t fd = openrv;
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166 // Fill the file with kShadowRodata.
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167 const uptr kMarkerSize = 512 * 1024 / sizeof(u64);
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168 InternalScopedBuffer<u64> marker(kMarkerSize);
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169 // volatile to prevent insertion of memset
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170 for (volatile u64 *p = marker.data(); p < marker.data() + kMarkerSize; p++)
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171 *p = kShadowRodata;
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172 internal_write(fd, marker.data(), marker.size());
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173 // Map the file into memory.
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174 uptr page = internal_mmap(0, GetPageSizeCached(), PROT_READ | PROT_WRITE,
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175 MAP_PRIVATE | MAP_ANONYMOUS, fd, 0);
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176 if (internal_iserror(page)) {
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177 internal_close(fd);
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178 return;
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179 }
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180 // Map the file into shadow of .rodata sections.
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181 MemoryMappingLayout proc_maps(/*cache_enabled*/true);
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182 // Reusing the buffer 'name'.
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183 MemoryMappedSegment segment(name, ARRAY_SIZE(name));
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184 while (proc_maps.Next(&segment)) {
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185 if (segment.filename[0] != 0 && segment.filename[0] != '[' &&
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186 segment.IsReadable() && segment.IsExecutable() &&
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187 !segment.IsWritable() && IsAppMem(segment.start)) {
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188 // Assume it's .rodata
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189 char *shadow_start = (char *)MemToShadow(segment.start);
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190 char *shadow_end = (char *)MemToShadow(segment.end);
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191 for (char *p = shadow_start; p < shadow_end; p += marker.size()) {
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192 internal_mmap(p, Min<uptr>(marker.size(), shadow_end - p),
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193 PROT_READ, MAP_PRIVATE | MAP_FIXED, fd, 0);
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194 }
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195 }
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196 }
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197 internal_close(fd);
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198 }
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199
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200 void InitializeShadowMemoryPlatform() {
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201 MapRodata();
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202 }
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203
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204 #endif // #if !SANITIZER_GO
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205
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206 void InitializePlatformEarly() {
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207 #ifdef TSAN_RUNTIME_VMA
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208 vmaSize =
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209 (MostSignificantSetBitIndex(GET_CURRENT_FRAME()) + 1);
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210 #if defined(__aarch64__)
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211 if (vmaSize != 39 && vmaSize != 42 && vmaSize != 48) {
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212 Printf("FATAL: ThreadSanitizer: unsupported VMA range\n");
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213 Printf("FATAL: Found %d - Supported 39, 42 and 48\n", vmaSize);
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214 Die();
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215 }
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216 #elif defined(__powerpc64__)
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131
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217 if (vmaSize != 44 && vmaSize != 46 && vmaSize != 47) {
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111
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218 Printf("FATAL: ThreadSanitizer: unsupported VMA range\n");
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131
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219 Printf("FATAL: Found %d - Supported 44, 46, and 47\n", vmaSize);
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111
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220 Die();
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221 }
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222 #endif
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223 #endif
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224 }
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225
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226 void InitializePlatform() {
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227 DisableCoreDumperIfNecessary();
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228
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229 // Go maps shadow memory lazily and works fine with limited address space.
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230 // Unlimited stack is not a problem as well, because the executable
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231 // is not compiled with -pie.
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232 if (!SANITIZER_GO) {
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233 bool reexec = false;
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234 // TSan doesn't play well with unlimited stack size (as stack
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235 // overlaps with shadow memory). If we detect unlimited stack size,
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236 // we re-exec the program with limited stack size as a best effort.
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237 if (StackSizeIsUnlimited()) {
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238 const uptr kMaxStackSize = 32 * 1024 * 1024;
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239 VReport(1, "Program is run with unlimited stack size, which wouldn't "
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240 "work with ThreadSanitizer.\n"
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241 "Re-execing with stack size limited to %zd bytes.\n",
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242 kMaxStackSize);
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243 SetStackSizeLimitInBytes(kMaxStackSize);
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244 reexec = true;
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245 }
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246
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247 if (!AddressSpaceIsUnlimited()) {
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248 Report("WARNING: Program is run with limited virtual address space,"
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249 " which wouldn't work with ThreadSanitizer.\n");
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250 Report("Re-execing with unlimited virtual address space.\n");
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251 SetAddressSpaceUnlimited();
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252 reexec = true;
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253 }
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254 #if SANITIZER_LINUX && defined(__aarch64__)
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255 // After patch "arm64: mm: support ARCH_MMAP_RND_BITS." is introduced in
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256 // linux kernel, the random gap between stack and mapped area is increased
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257 // from 128M to 36G on 39-bit aarch64. As it is almost impossible to cover
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258 // this big range, we should disable randomized virtual space on aarch64.
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259 int old_personality = personality(0xffffffff);
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260 if (old_personality != -1 && (old_personality & ADDR_NO_RANDOMIZE) == 0) {
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261 VReport(1, "WARNING: Program is run with randomized virtual address "
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262 "space, which wouldn't work with ThreadSanitizer.\n"
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263 "Re-execing with fixed virtual address space.\n");
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264 CHECK_NE(personality(old_personality | ADDR_NO_RANDOMIZE), -1);
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265 reexec = true;
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266 }
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267 // Initialize the guard pointer used in {sig}{set,long}jump.
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268 InitializeGuardPtr();
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269 #endif
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270 if (reexec)
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271 ReExec();
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272 }
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273
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274 #if !SANITIZER_GO
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275 CheckAndProtect();
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276 InitTlsSize();
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277 #endif
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278 }
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279
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280 #if !SANITIZER_GO
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281 // Extract file descriptors passed to glibc internal __res_iclose function.
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282 // This is required to properly "close" the fds, because we do not see internal
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283 // closes within glibc. The code is a pure hack.
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284 int ExtractResolvFDs(void *state, int *fds, int nfd) {
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285 #if SANITIZER_LINUX && !SANITIZER_ANDROID
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286 int cnt = 0;
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287 struct __res_state *statp = (struct __res_state*)state;
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288 for (int i = 0; i < MAXNS && cnt < nfd; i++) {
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289 if (statp->_u._ext.nsaddrs[i] && statp->_u._ext.nssocks[i] != -1)
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290 fds[cnt++] = statp->_u._ext.nssocks[i];
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291 }
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292 return cnt;
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293 #else
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294 return 0;
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295 #endif
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296 }
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297
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298 // Extract file descriptors passed via UNIX domain sockets.
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299 // This is requried to properly handle "open" of these fds.
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300 // see 'man recvmsg' and 'man 3 cmsg'.
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301 int ExtractRecvmsgFDs(void *msgp, int *fds, int nfd) {
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302 int res = 0;
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303 msghdr *msg = (msghdr*)msgp;
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304 struct cmsghdr *cmsg = CMSG_FIRSTHDR(msg);
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305 for (; cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
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306 if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS)
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307 continue;
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308 int n = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(fds[0]);
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309 for (int i = 0; i < n; i++) {
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310 fds[res++] = ((int*)CMSG_DATA(cmsg))[i];
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311 if (res == nfd)
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312 return res;
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313 }
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314 }
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315 return res;
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316 }
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317
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318 void ImitateTlsWrite(ThreadState *thr, uptr tls_addr, uptr tls_size) {
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319 // Check that the thr object is in tls;
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320 const uptr thr_beg = (uptr)thr;
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321 const uptr thr_end = (uptr)thr + sizeof(*thr);
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322 CHECK_GE(thr_beg, tls_addr);
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323 CHECK_LE(thr_beg, tls_addr + tls_size);
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324 CHECK_GE(thr_end, tls_addr);
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325 CHECK_LE(thr_end, tls_addr + tls_size);
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326 // Since the thr object is huge, skip it.
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327 MemoryRangeImitateWrite(thr, /*pc=*/2, tls_addr, thr_beg - tls_addr);
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328 MemoryRangeImitateWrite(thr, /*pc=*/2, thr_end,
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329 tls_addr + tls_size - thr_end);
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330 }
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331
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332 // Note: this function runs with async signals enabled,
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333 // so it must not touch any tsan state.
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334 int call_pthread_cancel_with_cleanup(int(*fn)(void *c, void *m,
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335 void *abstime), void *c, void *m, void *abstime,
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336 void(*cleanup)(void *arg), void *arg) {
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337 // pthread_cleanup_push/pop are hardcore macros mess.
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338 // We can't intercept nor call them w/o including pthread.h.
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339 int res;
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340 pthread_cleanup_push(cleanup, arg);
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341 res = fn(c, m, abstime);
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342 pthread_cleanup_pop(0);
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343 return res;
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344 }
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345 #endif
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346
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347 #if !SANITIZER_GO
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348 void ReplaceSystemMalloc() { }
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349 #endif
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350
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351 #if !SANITIZER_GO
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352 #if SANITIZER_ANDROID
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353 // On Android, one thread can call intercepted functions after
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354 // DestroyThreadState(), so add a fake thread state for "dead" threads.
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355 static ThreadState *dead_thread_state = nullptr;
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356
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357 ThreadState *cur_thread() {
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358 ThreadState* thr = reinterpret_cast<ThreadState*>(*get_android_tls_ptr());
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359 if (thr == nullptr) {
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360 __sanitizer_sigset_t emptyset;
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361 internal_sigfillset(&emptyset);
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362 __sanitizer_sigset_t oldset;
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363 CHECK_EQ(0, internal_sigprocmask(SIG_SETMASK, &emptyset, &oldset));
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364 thr = reinterpret_cast<ThreadState*>(*get_android_tls_ptr());
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365 if (thr == nullptr) {
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366 thr = reinterpret_cast<ThreadState*>(MmapOrDie(sizeof(ThreadState),
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367 "ThreadState"));
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368 *get_android_tls_ptr() = reinterpret_cast<uptr>(thr);
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369 if (dead_thread_state == nullptr) {
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370 dead_thread_state = reinterpret_cast<ThreadState*>(
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371 MmapOrDie(sizeof(ThreadState), "ThreadState"));
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372 dead_thread_state->fast_state.SetIgnoreBit();
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373 dead_thread_state->ignore_interceptors = 1;
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374 dead_thread_state->is_dead = true;
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375 *const_cast<int*>(&dead_thread_state->tid) = -1;
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376 CHECK_EQ(0, internal_mprotect(dead_thread_state, sizeof(ThreadState),
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377 PROT_READ));
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378 }
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379 }
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380 CHECK_EQ(0, internal_sigprocmask(SIG_SETMASK, &oldset, nullptr));
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381 }
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382 return thr;
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383 }
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384
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385 void cur_thread_finalize() {
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386 __sanitizer_sigset_t emptyset;
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387 internal_sigfillset(&emptyset);
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388 __sanitizer_sigset_t oldset;
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389 CHECK_EQ(0, internal_sigprocmask(SIG_SETMASK, &emptyset, &oldset));
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390 ThreadState* thr = reinterpret_cast<ThreadState*>(*get_android_tls_ptr());
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391 if (thr != dead_thread_state) {
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392 *get_android_tls_ptr() = reinterpret_cast<uptr>(dead_thread_state);
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393 UnmapOrDie(thr, sizeof(ThreadState));
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394 }
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395 CHECK_EQ(0, internal_sigprocmask(SIG_SETMASK, &oldset, nullptr));
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396 }
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397 #endif // SANITIZER_ANDROID
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398 #endif // if !SANITIZER_GO
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399
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400 } // namespace __tsan
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401
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402 #endif // SANITIZER_LINUX || SANITIZER_FREEBSD
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