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1 //===-- sanitizer_posix.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 shared between AddressSanitizer and ThreadSanitizer
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9 // run-time libraries and implements POSIX-specific functions from
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10 // sanitizer_posix.h.
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11 //===----------------------------------------------------------------------===//
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12
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13 #include "sanitizer_platform.h"
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14
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15 #if SANITIZER_POSIX
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16
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17 #include "sanitizer_common.h"
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18 #include "sanitizer_file.h"
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19 #include "sanitizer_libc.h"
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20 #include "sanitizer_posix.h"
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21 #include "sanitizer_procmaps.h"
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22 #include "sanitizer_stacktrace.h"
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23
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24 #include <errno.h>
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25 #include <fcntl.h>
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26 #include <signal.h>
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27 #include <sys/mman.h>
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28
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29 #if SANITIZER_FREEBSD
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30 // The MAP_NORESERVE define has been removed in FreeBSD 11.x, and even before
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31 // that, it was never implemented. So just define it to zero.
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32 #undef MAP_NORESERVE
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33 #define MAP_NORESERVE 0
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34 #endif
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35
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36 namespace __sanitizer {
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37
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38 // ------------- sanitizer_common.h
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39 uptr GetMmapGranularity() {
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40 return GetPageSize();
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41 }
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42
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43 void *MmapOrDie(uptr size, const char *mem_type, bool raw_report) {
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44 size = RoundUpTo(size, GetPageSizeCached());
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45 uptr res = internal_mmap(nullptr, size,
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46 PROT_READ | PROT_WRITE,
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47 MAP_PRIVATE | MAP_ANON, -1, 0);
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48 int reserrno;
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49 if (UNLIKELY(internal_iserror(res, &reserrno)))
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50 ReportMmapFailureAndDie(size, mem_type, "allocate", reserrno, raw_report);
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51 IncreaseTotalMmap(size);
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52 return (void *)res;
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53 }
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54
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55 void UnmapOrDie(void *addr, uptr size) {
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56 if (!addr || !size) return;
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57 uptr res = internal_munmap(addr, size);
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58 if (UNLIKELY(internal_iserror(res))) {
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59 Report("ERROR: %s failed to deallocate 0x%zx (%zd) bytes at address %p\n",
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60 SanitizerToolName, size, size, addr);
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61 CHECK("unable to unmap" && 0);
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62 }
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63 DecreaseTotalMmap(size);
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64 }
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65
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66 void *MmapOrDieOnFatalError(uptr size, const char *mem_type) {
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67 size = RoundUpTo(size, GetPageSizeCached());
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68 uptr res = internal_mmap(nullptr, size,
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69 PROT_READ | PROT_WRITE,
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70 MAP_PRIVATE | MAP_ANON, -1, 0);
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71 int reserrno;
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72 if (UNLIKELY(internal_iserror(res, &reserrno))) {
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73 if (reserrno == ENOMEM)
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74 return nullptr;
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75 ReportMmapFailureAndDie(size, mem_type, "allocate", reserrno);
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76 }
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77 IncreaseTotalMmap(size);
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78 return (void *)res;
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79 }
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80
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81 // We want to map a chunk of address space aligned to 'alignment'.
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82 // We do it by mapping a bit more and then unmapping redundant pieces.
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83 // We probably can do it with fewer syscalls in some OS-dependent way.
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84 void *MmapAlignedOrDieOnFatalError(uptr size, uptr alignment,
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85 const char *mem_type) {
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86 CHECK(IsPowerOfTwo(size));
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87 CHECK(IsPowerOfTwo(alignment));
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88 uptr map_size = size + alignment;
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89 uptr map_res = (uptr)MmapOrDieOnFatalError(map_size, mem_type);
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90 if (UNLIKELY(!map_res))
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91 return nullptr;
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92 uptr map_end = map_res + map_size;
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93 uptr res = map_res;
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94 if (!IsAligned(res, alignment)) {
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95 res = (map_res + alignment - 1) & ~(alignment - 1);
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96 UnmapOrDie((void*)map_res, res - map_res);
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97 }
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98 uptr end = res + size;
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99 if (end != map_end)
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100 UnmapOrDie((void*)end, map_end - end);
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101 return (void*)res;
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102 }
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103
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104 void *MmapNoReserveOrDie(uptr size, const char *mem_type) {
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105 uptr PageSize = GetPageSizeCached();
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106 uptr p = internal_mmap(nullptr,
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107 RoundUpTo(size, PageSize),
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108 PROT_READ | PROT_WRITE,
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109 MAP_PRIVATE | MAP_ANON | MAP_NORESERVE,
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110 -1, 0);
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111 int reserrno;
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112 if (UNLIKELY(internal_iserror(p, &reserrno)))
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113 ReportMmapFailureAndDie(size, mem_type, "allocate noreserve", reserrno);
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114 IncreaseTotalMmap(size);
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115 return (void *)p;
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116 }
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117
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118 void *MmapFixedImpl(uptr fixed_addr, uptr size, bool tolerate_enomem) {
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119 uptr PageSize = GetPageSizeCached();
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120 uptr p = internal_mmap((void*)(fixed_addr & ~(PageSize - 1)),
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121 RoundUpTo(size, PageSize),
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122 PROT_READ | PROT_WRITE,
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123 MAP_PRIVATE | MAP_ANON | MAP_FIXED,
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124 -1, 0);
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125 int reserrno;
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126 if (UNLIKELY(internal_iserror(p, &reserrno))) {
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127 if (tolerate_enomem && reserrno == ENOMEM)
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128 return nullptr;
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129 char mem_type[40];
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130 internal_snprintf(mem_type, sizeof(mem_type), "memory at address 0x%zx",
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131 fixed_addr);
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132 ReportMmapFailureAndDie(size, mem_type, "allocate", reserrno);
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133 }
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134 IncreaseTotalMmap(size);
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135 return (void *)p;
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136 }
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137
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138 void *MmapFixedOrDie(uptr fixed_addr, uptr size) {
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139 return MmapFixedImpl(fixed_addr, size, false /*tolerate_enomem*/);
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140 }
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141
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142 void *MmapFixedOrDieOnFatalError(uptr fixed_addr, uptr size) {
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143 return MmapFixedImpl(fixed_addr, size, true /*tolerate_enomem*/);
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144 }
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145
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146 bool MprotectNoAccess(uptr addr, uptr size) {
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147 return 0 == internal_mprotect((void*)addr, size, PROT_NONE);
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148 }
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149
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150 bool MprotectReadOnly(uptr addr, uptr size) {
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151 return 0 == internal_mprotect((void *)addr, size, PROT_READ);
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152 }
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153
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154 fd_t OpenFile(const char *filename, FileAccessMode mode, error_t *errno_p) {
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155 int flags;
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156 switch (mode) {
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157 case RdOnly: flags = O_RDONLY; break;
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158 case WrOnly: flags = O_WRONLY | O_CREAT; break;
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159 case RdWr: flags = O_RDWR | O_CREAT; break;
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160 }
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161 fd_t res = internal_open(filename, flags, 0660);
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162 if (internal_iserror(res, errno_p))
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163 return kInvalidFd;
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164 return res;
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165 }
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166
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167 void CloseFile(fd_t fd) {
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168 internal_close(fd);
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169 }
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170
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171 bool ReadFromFile(fd_t fd, void *buff, uptr buff_size, uptr *bytes_read,
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172 error_t *error_p) {
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173 uptr res = internal_read(fd, buff, buff_size);
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174 if (internal_iserror(res, error_p))
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175 return false;
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176 if (bytes_read)
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177 *bytes_read = res;
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178 return true;
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179 }
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180
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181 bool WriteToFile(fd_t fd, const void *buff, uptr buff_size, uptr *bytes_written,
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182 error_t *error_p) {
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183 uptr res = internal_write(fd, buff, buff_size);
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184 if (internal_iserror(res, error_p))
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185 return false;
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186 if (bytes_written)
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187 *bytes_written = res;
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188 return true;
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189 }
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190
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191 bool RenameFile(const char *oldpath, const char *newpath, error_t *error_p) {
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192 uptr res = internal_rename(oldpath, newpath);
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193 return !internal_iserror(res, error_p);
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194 }
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195
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196 void *MapFileToMemory(const char *file_name, uptr *buff_size) {
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197 fd_t fd = OpenFile(file_name, RdOnly);
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198 CHECK(fd != kInvalidFd);
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199 uptr fsize = internal_filesize(fd);
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200 CHECK_NE(fsize, (uptr)-1);
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201 CHECK_GT(fsize, 0);
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202 *buff_size = RoundUpTo(fsize, GetPageSizeCached());
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203 uptr map = internal_mmap(nullptr, *buff_size, PROT_READ, MAP_PRIVATE, fd, 0);
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204 return internal_iserror(map) ? nullptr : (void *)map;
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205 }
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206
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207 void *MapWritableFileToMemory(void *addr, uptr size, fd_t fd, OFF_T offset) {
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208 uptr flags = MAP_SHARED;
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209 if (addr) flags |= MAP_FIXED;
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210 uptr p = internal_mmap(addr, size, PROT_READ | PROT_WRITE, flags, fd, offset);
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211 int mmap_errno = 0;
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212 if (internal_iserror(p, &mmap_errno)) {
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213 Printf("could not map writable file (%d, %lld, %zu): %zd, errno: %d\n",
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214 fd, (long long)offset, size, p, mmap_errno);
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215 return nullptr;
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216 }
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217 return (void *)p;
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218 }
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219
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220 static inline bool IntervalsAreSeparate(uptr start1, uptr end1,
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221 uptr start2, uptr end2) {
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222 CHECK(start1 <= end1);
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223 CHECK(start2 <= end2);
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224 return (end1 < start2) || (end2 < start1);
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225 }
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226
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227 // FIXME: this is thread-unsafe, but should not cause problems most of the time.
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228 // When the shadow is mapped only a single thread usually exists (plus maybe
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229 // several worker threads on Mac, which aren't expected to map big chunks of
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230 // memory).
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231 bool MemoryRangeIsAvailable(uptr range_start, uptr range_end) {
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232 MemoryMappingLayout proc_maps(/*cache_enabled*/true);
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233 MemoryMappedSegment segment;
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234 while (proc_maps.Next(&segment)) {
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235 if (segment.start == segment.end) continue; // Empty range.
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236 CHECK_NE(0, segment.end);
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237 if (!IntervalsAreSeparate(segment.start, segment.end - 1, range_start,
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238 range_end))
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239 return false;
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240 }
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241 return true;
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242 }
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243
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244 void DumpProcessMap() {
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245 MemoryMappingLayout proc_maps(/*cache_enabled*/true);
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246 const sptr kBufSize = 4095;
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247 char *filename = (char*)MmapOrDie(kBufSize, __func__);
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248 MemoryMappedSegment segment(filename, kBufSize);
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249 Report("Process memory map follows:\n");
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250 while (proc_maps.Next(&segment)) {
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251 Printf("\t%p-%p\t%s\n", (void *)segment.start, (void *)segment.end,
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252 segment.filename);
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253 }
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254 Report("End of process memory map.\n");
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255 UnmapOrDie(filename, kBufSize);
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256 }
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257
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258 const char *GetPwd() {
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259 return GetEnv("PWD");
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260 }
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261
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262 bool IsPathSeparator(const char c) {
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263 return c == '/';
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264 }
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265
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266 bool IsAbsolutePath(const char *path) {
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267 return path != nullptr && IsPathSeparator(path[0]);
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268 }
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269
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270 void ReportFile::Write(const char *buffer, uptr length) {
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271 SpinMutexLock l(mu);
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272 static const char *kWriteError =
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273 "ReportFile::Write() can't output requested buffer!\n";
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274 ReopenIfNecessary();
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275 if (length != internal_write(fd, buffer, length)) {
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276 internal_write(fd, kWriteError, internal_strlen(kWriteError));
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277 Die();
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278 }
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279 }
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280
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281 bool GetCodeRangeForFile(const char *module, uptr *start, uptr *end) {
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282 MemoryMappingLayout proc_maps(/*cache_enabled*/false);
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283 InternalScopedString buff(kMaxPathLength);
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284 MemoryMappedSegment segment(buff.data(), kMaxPathLength);
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285 while (proc_maps.Next(&segment)) {
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286 if (segment.IsExecutable() &&
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287 internal_strcmp(module, segment.filename) == 0) {
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288 *start = segment.start;
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289 *end = segment.end;
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290 return true;
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291 }
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292 }
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293 return false;
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294 }
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295
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296 uptr SignalContext::GetAddress() const {
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297 auto si = static_cast<const siginfo_t *>(siginfo);
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298 return (uptr)si->si_addr;
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299 }
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300
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301 bool SignalContext::IsMemoryAccess() const {
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302 auto si = static_cast<const siginfo_t *>(siginfo);
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303 return si->si_signo == SIGSEGV;
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304 }
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305
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306 int SignalContext::GetType() const {
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307 return static_cast<const siginfo_t *>(siginfo)->si_signo;
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308 }
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309
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310 const char *SignalContext::Describe() const {
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311 switch (GetType()) {
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312 case SIGFPE:
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313 return "FPE";
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314 case SIGILL:
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315 return "ILL";
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316 case SIGABRT:
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317 return "ABRT";
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318 case SIGSEGV:
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319 return "SEGV";
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320 case SIGBUS:
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321 return "BUS";
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322 }
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323 return "UNKNOWN SIGNAL";
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324 }
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325
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326 } // namespace __sanitizer
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327
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328 #endif // SANITIZER_POSIX
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