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1 //===-- sanitizer_symbolizer_posix_libcdep.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.
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10 // POSIX-specific implementation of symbolizer parts.
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11 //===----------------------------------------------------------------------===//
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12
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13 #include "sanitizer_platform.h"
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14 #if SANITIZER_POSIX
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15 #include "sanitizer_allocator_internal.h"
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16 #include "sanitizer_common.h"
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17 #include "sanitizer_file.h"
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18 #include "sanitizer_flags.h"
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19 #include "sanitizer_internal_defs.h"
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20 #include "sanitizer_linux.h"
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21 #include "sanitizer_placement_new.h"
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22 #include "sanitizer_posix.h"
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23 #include "sanitizer_procmaps.h"
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24 #include "sanitizer_symbolizer_internal.h"
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25 #include "sanitizer_symbolizer_libbacktrace.h"
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26 #include "sanitizer_symbolizer_mac.h"
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27
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28 #include <dlfcn.h> // for dlsym()
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29 #include <errno.h>
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30 #include <stdint.h>
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31 #include <stdlib.h>
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32 #include <sys/wait.h>
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33 #include <unistd.h>
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34
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35 #if SANITIZER_MAC
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36 #include <util.h> // for forkpty()
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37 #endif // SANITIZER_MAC
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38
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39 // C++ demangling function, as required by Itanium C++ ABI. This is weak,
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40 // because we do not require a C++ ABI library to be linked to a program
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41 // using sanitizers; if it's not present, we'll just use the mangled name.
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42 namespace __cxxabiv1 {
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43 extern "C" SANITIZER_WEAK_ATTRIBUTE
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44 char *__cxa_demangle(const char *mangled, char *buffer,
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45 size_t *length, int *status);
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46 }
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47
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48 namespace __sanitizer {
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49
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50 // Attempts to demangle the name via __cxa_demangle from __cxxabiv1.
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51 const char *DemangleCXXABI(const char *name) {
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52 // FIXME: __cxa_demangle aggressively insists on allocating memory.
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53 // There's not much we can do about that, short of providing our
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54 // own demangler (libc++abi's implementation could be adapted so that
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55 // it does not allocate). For now, we just call it anyway, and we leak
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56 // the returned value.
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57 if (&__cxxabiv1::__cxa_demangle)
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58 if (const char *demangled_name =
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59 __cxxabiv1::__cxa_demangle(name, 0, 0, 0))
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60 return demangled_name;
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61
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62 return name;
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63 }
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64
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65 // As of now, there are no headers for the Swift runtime. Once they are
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66 // present, we will weakly link since we do not require Swift runtime to be
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67 // linked.
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68 typedef char *(*swift_demangle_ft)(const char *mangledName,
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69 size_t mangledNameLength, char *outputBuffer,
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70 size_t *outputBufferSize, uint32_t flags);
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71 static swift_demangle_ft swift_demangle_f;
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72
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73 // This must not happen lazily at symbolication time, because dlsym uses
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74 // malloc and thread-local storage, which is not a good thing to do during
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75 // symbolication.
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76 static void InitializeSwiftDemangler() {
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77 swift_demangle_f = (swift_demangle_ft)dlsym(RTLD_DEFAULT, "swift_demangle");
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78 }
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79
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80 // Attempts to demangle a Swift name. The demangler will return nullptr if a
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81 // non-Swift name is passed in.
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82 const char *DemangleSwift(const char *name) {
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83 if (!name) return nullptr;
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84
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85 // Check if we are dealing with a Swift mangled name first.
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86 if (name[0] != '_' || name[1] != 'T') {
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87 return nullptr;
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88 }
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89
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90 if (swift_demangle_f)
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91 return swift_demangle_f(name, internal_strlen(name), 0, 0, 0);
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92
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93 return nullptr;
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94 }
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95
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96 const char *DemangleSwiftAndCXX(const char *name) {
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97 if (!name) return nullptr;
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98 if (const char *swift_demangled_name = DemangleSwift(name))
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99 return swift_demangled_name;
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100 return DemangleCXXABI(name);
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101 }
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102
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103 static bool CreateTwoHighNumberedPipes(int *infd_, int *outfd_) {
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104 int *infd = NULL;
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105 int *outfd = NULL;
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106 // The client program may close its stdin and/or stdout and/or stderr
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107 // thus allowing socketpair to reuse file descriptors 0, 1 or 2.
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108 // In this case the communication between the forked processes may be
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109 // broken if either the parent or the child tries to close or duplicate
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110 // these descriptors. The loop below produces two pairs of file
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111 // descriptors, each greater than 2 (stderr).
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112 int sock_pair[5][2];
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113 for (int i = 0; i < 5; i++) {
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114 if (pipe(sock_pair[i]) == -1) {
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115 for (int j = 0; j < i; j++) {
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116 internal_close(sock_pair[j][0]);
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117 internal_close(sock_pair[j][1]);
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118 }
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119 return false;
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120 } else if (sock_pair[i][0] > 2 && sock_pair[i][1] > 2) {
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121 if (infd == NULL) {
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122 infd = sock_pair[i];
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123 } else {
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124 outfd = sock_pair[i];
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125 for (int j = 0; j < i; j++) {
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126 if (sock_pair[j] == infd) continue;
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127 internal_close(sock_pair[j][0]);
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128 internal_close(sock_pair[j][1]);
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129 }
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130 break;
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131 }
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132 }
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133 }
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134 CHECK(infd);
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135 CHECK(outfd);
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136 infd_[0] = infd[0];
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137 infd_[1] = infd[1];
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138 outfd_[0] = outfd[0];
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139 outfd_[1] = outfd[1];
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140 return true;
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141 }
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142
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143 bool SymbolizerProcess::StartSymbolizerSubprocess() {
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144 if (!FileExists(path_)) {
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145 if (!reported_invalid_path_) {
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146 Report("WARNING: invalid path to external symbolizer!\n");
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147 reported_invalid_path_ = true;
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148 }
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149 return false;
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150 }
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151
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152 int pid = -1;
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153
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154 int infd[2];
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155 internal_memset(&infd, 0, sizeof(infd));
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156 int outfd[2];
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157 internal_memset(&outfd, 0, sizeof(outfd));
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158 if (!CreateTwoHighNumberedPipes(infd, outfd)) {
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159 Report("WARNING: Can't create a socket pair to start "
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160 "external symbolizer (errno: %d)\n", errno);
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161 return false;
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162 }
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163
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164 if (use_forkpty_) {
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165 #if SANITIZER_MAC
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166 fd_t fd = kInvalidFd;
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167
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168 // forkpty redirects stdout and stderr into a single stream, so we would
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169 // receive error messages as standard replies. To avoid that, let's dup
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170 // stderr and restore it in the child.
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171 int saved_stderr = dup(STDERR_FILENO);
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172 CHECK_GE(saved_stderr, 0);
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173
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174 // We only need one pipe, for stdin of the child.
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175 close(outfd[0]);
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176 close(outfd[1]);
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177
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178 // Use forkpty to disable buffering in the new terminal.
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179 pid = internal_forkpty(&fd);
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180 if (pid == -1) {
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181 // forkpty() failed.
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182 Report("WARNING: failed to fork external symbolizer (errno: %d)\n",
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183 errno);
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184 return false;
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185 } else if (pid == 0) {
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186 // Child subprocess.
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187
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188 // infd[0] is the child's reading end.
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189 close(infd[1]);
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190
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191 // Set up stdin to read from the pipe.
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192 CHECK_GE(dup2(infd[0], STDIN_FILENO), 0);
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193 close(infd[0]);
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194
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195 // Restore stderr.
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196 CHECK_GE(dup2(saved_stderr, STDERR_FILENO), 0);
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197 close(saved_stderr);
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198
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199 const char *argv[kArgVMax];
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200 GetArgV(path_, argv);
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201 execv(path_, const_cast<char **>(&argv[0]));
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202 internal__exit(1);
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203 }
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204
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205 // Input for the child, infd[1] is our writing end.
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206 output_fd_ = infd[1];
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207 close(infd[0]);
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208
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209 // Continue execution in parent process.
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210 input_fd_ = fd;
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211
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212 close(saved_stderr);
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213
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214 // Disable echo in the new terminal, disable CR.
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215 struct termios termflags;
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216 tcgetattr(fd, &termflags);
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217 termflags.c_oflag &= ~ONLCR;
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218 termflags.c_lflag &= ~ECHO;
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219 tcsetattr(fd, TCSANOW, &termflags);
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220 #else // SANITIZER_MAC
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221 UNIMPLEMENTED();
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222 #endif // SANITIZER_MAC
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223 } else {
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224 const char *argv[kArgVMax];
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225 GetArgV(path_, argv);
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226 pid = StartSubprocess(path_, argv, /* stdin */ outfd[0],
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227 /* stdout */ infd[1]);
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228 if (pid < 0) {
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229 internal_close(infd[0]);
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230 internal_close(outfd[1]);
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231 return false;
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232 }
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233
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234 input_fd_ = infd[0];
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235 output_fd_ = outfd[1];
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236 }
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237
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238 CHECK_GT(pid, 0);
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239
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240 // Check that symbolizer subprocess started successfully.
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241 SleepForMillis(kSymbolizerStartupTimeMillis);
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242 if (!IsProcessRunning(pid)) {
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243 // Either waitpid failed, or child has already exited.
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244 Report("WARNING: external symbolizer didn't start up correctly!\n");
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245 return false;
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246 }
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247
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248 return true;
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249 }
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250
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251 class Addr2LineProcess : public SymbolizerProcess {
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252 public:
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253 Addr2LineProcess(const char *path, const char *module_name)
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254 : SymbolizerProcess(path), module_name_(internal_strdup(module_name)) {}
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255
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256 const char *module_name() const { return module_name_; }
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257
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258 private:
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259 void GetArgV(const char *path_to_binary,
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260 const char *(&argv)[kArgVMax]) const override {
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261 int i = 0;
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262 argv[i++] = path_to_binary;
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263 argv[i++] = "-iCfe";
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264 argv[i++] = module_name_;
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265 argv[i++] = nullptr;
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266 }
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267
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268 bool ReachedEndOfOutput(const char *buffer, uptr length) const override;
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269
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270 bool ReadFromSymbolizer(char *buffer, uptr max_length) override {
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271 if (!SymbolizerProcess::ReadFromSymbolizer(buffer, max_length))
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272 return false;
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273 // The returned buffer is empty when output is valid, but exceeds
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274 // max_length.
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275 if (*buffer == '\0')
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276 return true;
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277 // We should cut out output_terminator_ at the end of given buffer,
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278 // appended by addr2line to mark the end of its meaningful output.
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279 // We cannot scan buffer from it's beginning, because it is legal for it
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280 // to start with output_terminator_ in case given offset is invalid. So,
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281 // scanning from second character.
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282 char *garbage = internal_strstr(buffer + 1, output_terminator_);
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283 // This should never be NULL since buffer must end up with
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284 // output_terminator_.
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285 CHECK(garbage);
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286 // Trim the buffer.
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287 garbage[0] = '\0';
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288 return true;
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289 }
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290
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291 const char *module_name_; // Owned, leaked.
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292 static const char output_terminator_[];
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293 };
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294
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295 const char Addr2LineProcess::output_terminator_[] = "??\n??:0\n";
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296
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297 bool Addr2LineProcess::ReachedEndOfOutput(const char *buffer,
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298 uptr length) const {
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299 const size_t kTerminatorLen = sizeof(output_terminator_) - 1;
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300 // Skip, if we read just kTerminatorLen bytes, because Addr2Line output
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301 // should consist at least of two pairs of lines:
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302 // 1. First one, corresponding to given offset to be symbolized
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303 // (may be equal to output_terminator_, if offset is not valid).
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304 // 2. Second one for output_terminator_, itself to mark the end of output.
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305 if (length <= kTerminatorLen) return false;
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306 // Addr2Line output should end up with output_terminator_.
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307 return !internal_memcmp(buffer + length - kTerminatorLen,
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308 output_terminator_, kTerminatorLen);
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309 }
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310
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311 class Addr2LinePool : public SymbolizerTool {
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312 public:
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313 explicit Addr2LinePool(const char *addr2line_path,
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314 LowLevelAllocator *allocator)
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315 : addr2line_path_(addr2line_path), allocator_(allocator),
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316 addr2line_pool_(16) {}
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317
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318 bool SymbolizePC(uptr addr, SymbolizedStack *stack) override {
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319 if (const char *buf =
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320 SendCommand(stack->info.module, stack->info.module_offset)) {
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321 ParseSymbolizePCOutput(buf, stack);
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322 return true;
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323 }
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324 return false;
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325 }
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326
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327 bool SymbolizeData(uptr addr, DataInfo *info) override {
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328 return false;
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329 }
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330
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331 private:
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332 const char *SendCommand(const char *module_name, uptr module_offset) {
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333 Addr2LineProcess *addr2line = 0;
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334 for (uptr i = 0; i < addr2line_pool_.size(); ++i) {
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335 if (0 ==
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336 internal_strcmp(module_name, addr2line_pool_[i]->module_name())) {
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337 addr2line = addr2line_pool_[i];
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338 break;
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339 }
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340 }
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341 if (!addr2line) {
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342 addr2line =
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343 new(*allocator_) Addr2LineProcess(addr2line_path_, module_name);
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344 addr2line_pool_.push_back(addr2line);
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345 }
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346 CHECK_EQ(0, internal_strcmp(module_name, addr2line->module_name()));
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347 char buffer[kBufferSize];
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348 internal_snprintf(buffer, kBufferSize, "0x%zx\n0x%zx\n",
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349 module_offset, dummy_address_);
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350 return addr2line->SendCommand(buffer);
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351 }
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352
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353 static const uptr kBufferSize = 64;
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354 const char *addr2line_path_;
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355 LowLevelAllocator *allocator_;
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356 InternalMmapVector<Addr2LineProcess*> addr2line_pool_;
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357 static const uptr dummy_address_ =
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358 FIRST_32_SECOND_64(UINT32_MAX, UINT64_MAX);
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359 };
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360
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361 #if SANITIZER_SUPPORTS_WEAK_HOOKS
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362 extern "C" {
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363 SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
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364 bool __sanitizer_symbolize_code(const char *ModuleName, u64 ModuleOffset,
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365 char *Buffer, int MaxLength);
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366 SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
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367 bool __sanitizer_symbolize_data(const char *ModuleName, u64 ModuleOffset,
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368 char *Buffer, int MaxLength);
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369 SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
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370 void __sanitizer_symbolize_flush();
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371 SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
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372 int __sanitizer_symbolize_demangle(const char *Name, char *Buffer,
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373 int MaxLength);
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374 } // extern "C"
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375
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376 class InternalSymbolizer : public SymbolizerTool {
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377 public:
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378 static InternalSymbolizer *get(LowLevelAllocator *alloc) {
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379 if (__sanitizer_symbolize_code != 0 &&
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380 __sanitizer_symbolize_data != 0) {
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381 return new(*alloc) InternalSymbolizer();
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382 }
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383 return 0;
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384 }
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385
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386 bool SymbolizePC(uptr addr, SymbolizedStack *stack) override {
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387 bool result = __sanitizer_symbolize_code(
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388 stack->info.module, stack->info.module_offset, buffer_, kBufferSize);
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389 if (result) ParseSymbolizePCOutput(buffer_, stack);
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390 return result;
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391 }
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392
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393 bool SymbolizeData(uptr addr, DataInfo *info) override {
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394 bool result = __sanitizer_symbolize_data(info->module, info->module_offset,
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395 buffer_, kBufferSize);
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396 if (result) {
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397 ParseSymbolizeDataOutput(buffer_, info);
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398 info->start += (addr - info->module_offset); // Add the base address.
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399 }
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400 return result;
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401 }
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402
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403 void Flush() override {
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404 if (__sanitizer_symbolize_flush)
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405 __sanitizer_symbolize_flush();
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406 }
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407
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408 const char *Demangle(const char *name) override {
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409 if (__sanitizer_symbolize_demangle) {
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410 for (uptr res_length = 1024;
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411 res_length <= InternalSizeClassMap::kMaxSize;) {
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412 char *res_buff = static_cast<char*>(InternalAlloc(res_length));
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413 uptr req_length =
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414 __sanitizer_symbolize_demangle(name, res_buff, res_length);
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415 if (req_length > res_length) {
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416 res_length = req_length + 1;
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417 InternalFree(res_buff);
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418 continue;
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419 }
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420 return res_buff;
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421 }
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422 }
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423 return name;
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424 }
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425
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426 private:
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427 InternalSymbolizer() { }
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428
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429 static const int kBufferSize = 16 * 1024;
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430 char buffer_[kBufferSize];
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431 };
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432 #else // SANITIZER_SUPPORTS_WEAK_HOOKS
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433
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434 class InternalSymbolizer : public SymbolizerTool {
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435 public:
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436 static InternalSymbolizer *get(LowLevelAllocator *alloc) { return 0; }
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437 };
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438
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439 #endif // SANITIZER_SUPPORTS_WEAK_HOOKS
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440
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441 const char *Symbolizer::PlatformDemangle(const char *name) {
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442 return DemangleSwiftAndCXX(name);
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443 }
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444
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445 void Symbolizer::PlatformPrepareForSandboxing() {}
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446
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447 static SymbolizerTool *ChooseExternalSymbolizer(LowLevelAllocator *allocator) {
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448 const char *path = common_flags()->external_symbolizer_path;
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449 const char *binary_name = path ? StripModuleName(path) : "";
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450 if (path && path[0] == '\0') {
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451 VReport(2, "External symbolizer is explicitly disabled.\n");
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452 return nullptr;
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|
|
453 } else if (!internal_strcmp(binary_name, "llvm-symbolizer")) {
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|
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454 VReport(2, "Using llvm-symbolizer at user-specified path: %s\n", path);
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|
|
455 return new(*allocator) LLVMSymbolizer(path, allocator);
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456 } else if (!internal_strcmp(binary_name, "atos")) {
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|
457 #if SANITIZER_MAC
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|
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458 VReport(2, "Using atos at user-specified path: %s\n", path);
|
|
|
459 return new(*allocator) AtosSymbolizer(path, allocator);
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|
|
460 #else // SANITIZER_MAC
|
|
|
461 Report("ERROR: Using `atos` is only supported on Darwin.\n");
|
|
|
462 Die();
|
|
|
463 #endif // SANITIZER_MAC
|
|
|
464 } else if (!internal_strcmp(binary_name, "addr2line")) {
|
|
|
465 VReport(2, "Using addr2line at user-specified path: %s\n", path);
|
|
|
466 return new(*allocator) Addr2LinePool(path, allocator);
|
|
|
467 } else if (path) {
|
|
|
468 Report("ERROR: External symbolizer path is set to '%s' which isn't "
|
|
|
469 "a known symbolizer. Please set the path to the llvm-symbolizer "
|
|
|
470 "binary or other known tool.\n", path);
|
|
|
471 Die();
|
|
|
472 }
|
|
|
473
|
|
|
474 // Otherwise symbolizer program is unknown, let's search $PATH
|
|
|
475 CHECK(path == nullptr);
|
|
|
476 #if SANITIZER_MAC
|
|
|
477 if (const char *found_path = FindPathToBinary("atos")) {
|
|
|
478 VReport(2, "Using atos found at: %s\n", found_path);
|
|
|
479 return new(*allocator) AtosSymbolizer(found_path, allocator);
|
|
|
480 }
|
|
|
481 #endif // SANITIZER_MAC
|
|
|
482 if (const char *found_path = FindPathToBinary("llvm-symbolizer")) {
|
|
|
483 VReport(2, "Using llvm-symbolizer found at: %s\n", found_path);
|
|
|
484 return new(*allocator) LLVMSymbolizer(found_path, allocator);
|
|
|
485 }
|
|
|
486 if (common_flags()->allow_addr2line) {
|
|
|
487 if (const char *found_path = FindPathToBinary("addr2line")) {
|
|
|
488 VReport(2, "Using addr2line found at: %s\n", found_path);
|
|
|
489 return new(*allocator) Addr2LinePool(found_path, allocator);
|
|
|
490 }
|
|
|
491 }
|
|
|
492 return nullptr;
|
|
|
493 }
|
|
|
494
|
|
|
495 static void ChooseSymbolizerTools(IntrusiveList<SymbolizerTool> *list,
|
|
|
496 LowLevelAllocator *allocator) {
|
|
|
497 if (!common_flags()->symbolize) {
|
|
|
498 VReport(2, "Symbolizer is disabled.\n");
|
|
|
499 return;
|
|
|
500 }
|
|
|
501 if (IsAllocatorOutOfMemory()) {
|
|
|
502 VReport(2, "Cannot use internal symbolizer: out of memory\n");
|
|
|
503 } else if (SymbolizerTool *tool = InternalSymbolizer::get(allocator)) {
|
|
|
504 VReport(2, "Using internal symbolizer.\n");
|
|
|
505 list->push_back(tool);
|
|
|
506 return;
|
|
|
507 }
|
|
|
508 if (SymbolizerTool *tool = LibbacktraceSymbolizer::get(allocator)) {
|
|
|
509 VReport(2, "Using libbacktrace symbolizer.\n");
|
|
|
510 list->push_back(tool);
|
|
|
511 return;
|
|
|
512 }
|
|
|
513
|
|
|
514 if (SymbolizerTool *tool = ChooseExternalSymbolizer(allocator)) {
|
|
|
515 list->push_back(tool);
|
|
|
516 }
|
|
|
517
|
|
|
518 #if SANITIZER_MAC
|
|
|
519 VReport(2, "Using dladdr symbolizer.\n");
|
|
|
520 list->push_back(new(*allocator) DlAddrSymbolizer());
|
|
|
521 #endif // SANITIZER_MAC
|
|
|
522 }
|
|
|
523
|
|
|
524 Symbolizer *Symbolizer::PlatformInit() {
|
|
|
525 IntrusiveList<SymbolizerTool> list;
|
|
|
526 list.clear();
|
|
|
527 ChooseSymbolizerTools(&list, &symbolizer_allocator_);
|
|
|
528 return new(symbolizer_allocator_) Symbolizer(list);
|
|
|
529 }
|
|
|
530
|
|
|
531 void Symbolizer::LateInitialize() {
|
|
|
532 Symbolizer::GetOrInit();
|
|
|
533 InitializeSwiftDemangler();
|
|
|
534 }
|
|
|
535
|
|
|
536 } // namespace __sanitizer
|
|
|
537
|
|
|
538 #endif // SANITIZER_POSIX
|
