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145
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1 //===-- sanitizer_symbolizer_posix_libcdep.cpp ----------------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // This file is shared between AddressSanitizer and ThreadSanitizer
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10 // run-time libraries.
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11 // POSIX-specific implementation of symbolizer parts.
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "sanitizer_platform.h"
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15 #if SANITIZER_POSIX
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16 #include "sanitizer_allocator_internal.h"
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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_flags.h"
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20 #include "sanitizer_internal_defs.h"
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21 #include "sanitizer_linux.h"
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22 #include "sanitizer_placement_new.h"
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23 #include "sanitizer_posix.h"
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24 #include "sanitizer_procmaps.h"
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25 #include "sanitizer_symbolizer_internal.h"
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26 #include "sanitizer_symbolizer_libbacktrace.h"
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27 #include "sanitizer_symbolizer_mac.h"
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28
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29 #include <dlfcn.h> // for dlsym()
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30 #include <errno.h>
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31 #include <stdint.h>
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32 #include <stdlib.h>
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33 #include <sys/wait.h>
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34 #include <unistd.h>
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35
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36 // C++ demangling function, as required by Itanium C++ ABI. This is weak,
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37 // because we do not require a C++ ABI library to be linked to a program
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38 // using sanitizers; if it's not present, we'll just use the mangled name.
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39 namespace __cxxabiv1 {
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40 extern "C" SANITIZER_WEAK_ATTRIBUTE
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41 char *__cxa_demangle(const char *mangled, char *buffer,
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42 size_t *length, int *status);
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43 }
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44
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45 namespace __sanitizer {
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46
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47 // Attempts to demangle the name via __cxa_demangle from __cxxabiv1.
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48 const char *DemangleCXXABI(const char *name) {
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49 // FIXME: __cxa_demangle aggressively insists on allocating memory.
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50 // There's not much we can do about that, short of providing our
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51 // own demangler (libc++abi's implementation could be adapted so that
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52 // it does not allocate). For now, we just call it anyway, and we leak
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53 // the returned value.
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54 if (&__cxxabiv1::__cxa_demangle)
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55 if (const char *demangled_name =
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56 __cxxabiv1::__cxa_demangle(name, 0, 0, 0))
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57 return demangled_name;
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58
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59 return name;
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60 }
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61
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62 // As of now, there are no headers for the Swift runtime. Once they are
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63 // present, we will weakly link since we do not require Swift runtime to be
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64 // linked.
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65 typedef char *(*swift_demangle_ft)(const char *mangledName,
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66 size_t mangledNameLength, char *outputBuffer,
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67 size_t *outputBufferSize, uint32_t flags);
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68 static swift_demangle_ft swift_demangle_f;
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69
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70 // This must not happen lazily at symbolication time, because dlsym uses
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71 // malloc and thread-local storage, which is not a good thing to do during
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72 // symbolication.
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73 static void InitializeSwiftDemangler() {
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74 swift_demangle_f = (swift_demangle_ft)dlsym(RTLD_DEFAULT, "swift_demangle");
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75 (void)dlerror(); // Cleanup error message in case of failure
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76 }
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77
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78 // Attempts to demangle a Swift name. The demangler will return nullptr if a
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79 // non-Swift name is passed in.
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80 const char *DemangleSwift(const char *name) {
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81 if (!name) return nullptr;
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82
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83 // Check if we are dealing with a Swift mangled name first.
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84 if (name[0] != '_' || name[1] != 'T') {
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85 return nullptr;
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86 }
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87
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88 if (swift_demangle_f)
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89 return swift_demangle_f(name, internal_strlen(name), 0, 0, 0);
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90
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91 return nullptr;
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92 }
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93
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94 const char *DemangleSwiftAndCXX(const char *name) {
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95 if (!name) return nullptr;
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96 if (const char *swift_demangled_name = DemangleSwift(name))
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97 return swift_demangled_name;
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98 return DemangleCXXABI(name);
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99 }
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100
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101 static bool CreateTwoHighNumberedPipes(int *infd_, int *outfd_) {
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102 int *infd = NULL;
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103 int *outfd = NULL;
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104 // The client program may close its stdin and/or stdout and/or stderr
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105 // thus allowing socketpair to reuse file descriptors 0, 1 or 2.
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106 // In this case the communication between the forked processes may be
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107 // broken if either the parent or the child tries to close or duplicate
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108 // these descriptors. The loop below produces two pairs of file
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109 // descriptors, each greater than 2 (stderr).
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110 int sock_pair[5][2];
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111 for (int i = 0; i < 5; i++) {
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112 if (pipe(sock_pair[i]) == -1) {
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113 for (int j = 0; j < i; j++) {
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114 internal_close(sock_pair[j][0]);
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115 internal_close(sock_pair[j][1]);
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116 }
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117 return false;
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118 } else if (sock_pair[i][0] > 2 && sock_pair[i][1] > 2) {
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119 if (infd == NULL) {
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120 infd = sock_pair[i];
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121 } else {
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122 outfd = sock_pair[i];
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123 for (int j = 0; j < i; j++) {
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124 if (sock_pair[j] == infd) continue;
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125 internal_close(sock_pair[j][0]);
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126 internal_close(sock_pair[j][1]);
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127 }
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128 break;
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129 }
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130 }
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131 }
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132 CHECK(infd);
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133 CHECK(outfd);
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134 infd_[0] = infd[0];
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135 infd_[1] = infd[1];
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136 outfd_[0] = outfd[0];
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137 outfd_[1] = outfd[1];
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138 return true;
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139 }
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140
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141 bool SymbolizerProcess::StartSymbolizerSubprocess() {
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142 if (!FileExists(path_)) {
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143 if (!reported_invalid_path_) {
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144 Report("WARNING: invalid path to external symbolizer!\n");
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145 reported_invalid_path_ = true;
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146 }
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147 return false;
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148 }
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149
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150 const char *argv[kArgVMax];
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151 GetArgV(path_, argv);
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152 pid_t pid;
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153
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154 if (use_posix_spawn_) {
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155 #if SANITIZER_MAC
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156 fd_t fd = internal_spawn(argv, &pid);
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157 if (fd == kInvalidFd) {
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158 Report("WARNING: failed to spawn external symbolizer (errno: %d)\n",
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159 errno);
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160 return false;
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161 }
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162
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163 input_fd_ = fd;
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164 output_fd_ = fd;
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165 #else // SANITIZER_MAC
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166 UNIMPLEMENTED();
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167 #endif // SANITIZER_MAC
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168 } else {
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169 fd_t infd[2] = {}, outfd[2] = {};
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170 if (!CreateTwoHighNumberedPipes(infd, outfd)) {
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171 Report("WARNING: Can't create a socket pair to start "
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172 "external symbolizer (errno: %d)\n", errno);
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173 return false;
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174 }
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175
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176 pid = StartSubprocess(path_, argv, /* stdin */ outfd[0],
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177 /* stdout */ infd[1]);
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178 if (pid < 0) {
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179 internal_close(infd[0]);
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180 internal_close(outfd[1]);
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181 return false;
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182 }
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183
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184 input_fd_ = infd[0];
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185 output_fd_ = outfd[1];
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186 }
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187
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188 CHECK_GT(pid, 0);
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189
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190 // Check that symbolizer subprocess started successfully.
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191 SleepForMillis(kSymbolizerStartupTimeMillis);
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192 if (!IsProcessRunning(pid)) {
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193 // Either waitpid failed, or child has already exited.
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194 Report("WARNING: external symbolizer didn't start up correctly!\n");
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195 return false;
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196 }
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197
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198 return true;
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199 }
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200
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201 class Addr2LineProcess : public SymbolizerProcess {
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202 public:
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203 Addr2LineProcess(const char *path, const char *module_name)
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204 : SymbolizerProcess(path), module_name_(internal_strdup(module_name)) {}
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205
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206 const char *module_name() const { return module_name_; }
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207
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208 private:
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209 void GetArgV(const char *path_to_binary,
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210 const char *(&argv)[kArgVMax]) const override {
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211 int i = 0;
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212 argv[i++] = path_to_binary;
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213 argv[i++] = "-iCfe";
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214 argv[i++] = module_name_;
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215 argv[i++] = nullptr;
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216 }
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217
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218 bool ReachedEndOfOutput(const char *buffer, uptr length) const override;
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219
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220 bool ReadFromSymbolizer(char *buffer, uptr max_length) override {
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221 if (!SymbolizerProcess::ReadFromSymbolizer(buffer, max_length))
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222 return false;
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223 // The returned buffer is empty when output is valid, but exceeds
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224 // max_length.
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225 if (*buffer == '\0')
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226 return true;
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227 // We should cut out output_terminator_ at the end of given buffer,
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228 // appended by addr2line to mark the end of its meaningful output.
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229 // We cannot scan buffer from it's beginning, because it is legal for it
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230 // to start with output_terminator_ in case given offset is invalid. So,
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231 // scanning from second character.
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232 char *garbage = internal_strstr(buffer + 1, output_terminator_);
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233 // This should never be NULL since buffer must end up with
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234 // output_terminator_.
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235 CHECK(garbage);
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236 // Trim the buffer.
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237 garbage[0] = '\0';
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238 return true;
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239 }
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240
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241 const char *module_name_; // Owned, leaked.
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242 static const char output_terminator_[];
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243 };
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244
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245 const char Addr2LineProcess::output_terminator_[] = "??\n??:0\n";
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246
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247 bool Addr2LineProcess::ReachedEndOfOutput(const char *buffer,
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248 uptr length) const {
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249 const size_t kTerminatorLen = sizeof(output_terminator_) - 1;
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250 // Skip, if we read just kTerminatorLen bytes, because Addr2Line output
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251 // should consist at least of two pairs of lines:
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252 // 1. First one, corresponding to given offset to be symbolized
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253 // (may be equal to output_terminator_, if offset is not valid).
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254 // 2. Second one for output_terminator_, itself to mark the end of output.
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255 if (length <= kTerminatorLen) return false;
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256 // Addr2Line output should end up with output_terminator_.
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257 return !internal_memcmp(buffer + length - kTerminatorLen,
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258 output_terminator_, kTerminatorLen);
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259 }
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260
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261 class Addr2LinePool : public SymbolizerTool {
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262 public:
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263 explicit Addr2LinePool(const char *addr2line_path,
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264 LowLevelAllocator *allocator)
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265 : addr2line_path_(addr2line_path), allocator_(allocator) {
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266 addr2line_pool_.reserve(16);
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267 }
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268
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269 bool SymbolizePC(uptr addr, SymbolizedStack *stack) override {
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270 if (const char *buf =
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271 SendCommand(stack->info.module, stack->info.module_offset)) {
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272 ParseSymbolizePCOutput(buf, stack);
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273 return true;
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274 }
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275 return false;
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276 }
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277
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278 bool SymbolizeData(uptr addr, DataInfo *info) override {
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279 return false;
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280 }
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281
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282 private:
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283 const char *SendCommand(const char *module_name, uptr module_offset) {
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284 Addr2LineProcess *addr2line = 0;
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285 for (uptr i = 0; i < addr2line_pool_.size(); ++i) {
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286 if (0 ==
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287 internal_strcmp(module_name, addr2line_pool_[i]->module_name())) {
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288 addr2line = addr2line_pool_[i];
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289 break;
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290 }
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291 }
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292 if (!addr2line) {
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293 addr2line =
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294 new(*allocator_) Addr2LineProcess(addr2line_path_, module_name);
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295 addr2line_pool_.push_back(addr2line);
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296 }
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297 CHECK_EQ(0, internal_strcmp(module_name, addr2line->module_name()));
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298 char buffer[kBufferSize];
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299 internal_snprintf(buffer, kBufferSize, "0x%zx\n0x%zx\n",
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300 module_offset, dummy_address_);
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301 return addr2line->SendCommand(buffer);
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302 }
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303
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304 static const uptr kBufferSize = 64;
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305 const char *addr2line_path_;
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306 LowLevelAllocator *allocator_;
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307 InternalMmapVector<Addr2LineProcess*> addr2line_pool_;
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308 static const uptr dummy_address_ =
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309 FIRST_32_SECOND_64(UINT32_MAX, UINT64_MAX);
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310 };
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311
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312 #if SANITIZER_SUPPORTS_WEAK_HOOKS
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313 extern "C" {
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314 SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
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315 bool __sanitizer_symbolize_code(const char *ModuleName, u64 ModuleOffset,
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316 char *Buffer, int MaxLength);
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317 SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
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318 bool __sanitizer_symbolize_data(const char *ModuleName, u64 ModuleOffset,
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319 char *Buffer, int MaxLength);
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320 SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
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321 void __sanitizer_symbolize_flush();
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322 SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
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323 int __sanitizer_symbolize_demangle(const char *Name, char *Buffer,
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324 int MaxLength);
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325 } // extern "C"
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326
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327 class InternalSymbolizer : public SymbolizerTool {
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328 public:
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329 static InternalSymbolizer *get(LowLevelAllocator *alloc) {
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330 if (__sanitizer_symbolize_code != 0 &&
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331 __sanitizer_symbolize_data != 0) {
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332 return new(*alloc) InternalSymbolizer();
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333 }
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334 return 0;
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335 }
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336
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337 bool SymbolizePC(uptr addr, SymbolizedStack *stack) override {
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338 bool result = __sanitizer_symbolize_code(
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339 stack->info.module, stack->info.module_offset, buffer_, kBufferSize);
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340 if (result) ParseSymbolizePCOutput(buffer_, stack);
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341 return result;
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342 }
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343
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344 bool SymbolizeData(uptr addr, DataInfo *info) override {
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345 bool result = __sanitizer_symbolize_data(info->module, info->module_offset,
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346 buffer_, kBufferSize);
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347 if (result) {
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348 ParseSymbolizeDataOutput(buffer_, info);
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349 info->start += (addr - info->module_offset); // Add the base address.
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350 }
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351 return result;
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352 }
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353
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354 void Flush() override {
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355 if (__sanitizer_symbolize_flush)
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356 __sanitizer_symbolize_flush();
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357 }
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358
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359 const char *Demangle(const char *name) override {
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360 if (__sanitizer_symbolize_demangle) {
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361 for (uptr res_length = 1024;
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362 res_length <= InternalSizeClassMap::kMaxSize;) {
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363 char *res_buff = static_cast<char*>(InternalAlloc(res_length));
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364 uptr req_length =
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365 __sanitizer_symbolize_demangle(name, res_buff, res_length);
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366 if (req_length > res_length) {
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367 res_length = req_length + 1;
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368 InternalFree(res_buff);
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369 continue;
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370 }
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371 return res_buff;
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372 }
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373 }
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374 return name;
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375 }
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376
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377 private:
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378 InternalSymbolizer() { }
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379
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380 static const int kBufferSize = 16 * 1024;
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381 char buffer_[kBufferSize];
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382 };
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383 #else // SANITIZER_SUPPORTS_WEAK_HOOKS
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384
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385 class InternalSymbolizer : public SymbolizerTool {
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386 public:
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387 static InternalSymbolizer *get(LowLevelAllocator *alloc) { return 0; }
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388 };
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389
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390 #endif // SANITIZER_SUPPORTS_WEAK_HOOKS
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391
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392 const char *Symbolizer::PlatformDemangle(const char *name) {
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393 return DemangleSwiftAndCXX(name);
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394 }
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395
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396 static SymbolizerTool *ChooseExternalSymbolizer(LowLevelAllocator *allocator) {
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397 const char *path = common_flags()->external_symbolizer_path;
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398 const char *binary_name = path ? StripModuleName(path) : "";
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399 if (path && path[0] == '\0') {
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400 VReport(2, "External symbolizer is explicitly disabled.\n");
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401 return nullptr;
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402 } else if (!internal_strcmp(binary_name, "llvm-symbolizer")) {
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403 VReport(2, "Using llvm-symbolizer at user-specified path: %s\n", path);
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404 return new(*allocator) LLVMSymbolizer(path, allocator);
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405 } else if (!internal_strcmp(binary_name, "atos")) {
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406 #if SANITIZER_MAC
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407 VReport(2, "Using atos at user-specified path: %s\n", path);
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408 return new(*allocator) AtosSymbolizer(path, allocator);
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409 #else // SANITIZER_MAC
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410 Report("ERROR: Using `atos` is only supported on Darwin.\n");
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411 Die();
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412 #endif // SANITIZER_MAC
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413 } else if (!internal_strcmp(binary_name, "addr2line")) {
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414 VReport(2, "Using addr2line at user-specified path: %s\n", path);
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415 return new(*allocator) Addr2LinePool(path, allocator);
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416 } else if (path) {
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417 Report("ERROR: External symbolizer path is set to '%s' which isn't "
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418 "a known symbolizer. Please set the path to the llvm-symbolizer "
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419 "binary or other known tool.\n", path);
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420 Die();
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421 }
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422
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423 // Otherwise symbolizer program is unknown, let's search $PATH
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424 CHECK(path == nullptr);
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425 #if SANITIZER_MAC
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426 if (const char *found_path = FindPathToBinary("atos")) {
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427 VReport(2, "Using atos found at: %s\n", found_path);
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428 return new(*allocator) AtosSymbolizer(found_path, allocator);
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429 }
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430 #endif // SANITIZER_MAC
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431 if (const char *found_path = FindPathToBinary("llvm-symbolizer")) {
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432 VReport(2, "Using llvm-symbolizer found at: %s\n", found_path);
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433 return new(*allocator) LLVMSymbolizer(found_path, allocator);
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434 }
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435 if (common_flags()->allow_addr2line) {
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436 if (const char *found_path = FindPathToBinary("addr2line")) {
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437 VReport(2, "Using addr2line found at: %s\n", found_path);
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438 return new(*allocator) Addr2LinePool(found_path, allocator);
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439 }
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440 }
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441 return nullptr;
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442 }
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443
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444 static void ChooseSymbolizerTools(IntrusiveList<SymbolizerTool> *list,
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445 LowLevelAllocator *allocator) {
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446 if (!common_flags()->symbolize) {
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447 VReport(2, "Symbolizer is disabled.\n");
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448 return;
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449 }
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450 if (IsAllocatorOutOfMemory()) {
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451 VReport(2, "Cannot use internal symbolizer: out of memory\n");
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452 } else if (SymbolizerTool *tool = InternalSymbolizer::get(allocator)) {
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453 VReport(2, "Using internal symbolizer.\n");
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454 list->push_back(tool);
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455 return;
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456 }
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457 if (SymbolizerTool *tool = LibbacktraceSymbolizer::get(allocator)) {
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458 VReport(2, "Using libbacktrace symbolizer.\n");
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459 list->push_back(tool);
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460 return;
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|
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461 }
|
|
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462
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|
463 if (SymbolizerTool *tool = ChooseExternalSymbolizer(allocator)) {
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464 list->push_back(tool);
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|
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465 }
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466
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|
467 #if SANITIZER_MAC
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468 VReport(2, "Using dladdr symbolizer.\n");
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|
|
469 list->push_back(new(*allocator) DlAddrSymbolizer());
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470 #endif // SANITIZER_MAC
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471 }
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|
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472
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|
|
473 Symbolizer *Symbolizer::PlatformInit() {
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474 IntrusiveList<SymbolizerTool> list;
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|
|
475 list.clear();
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476 ChooseSymbolizerTools(&list, &symbolizer_allocator_);
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477 return new(symbolizer_allocator_) Symbolizer(list);
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|
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478 }
|
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479
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|
|
480 void Symbolizer::LateInitialize() {
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|
|
481 Symbolizer::GetOrInit();
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|
|
482 InitializeSwiftDemangler();
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|
|
483 }
|
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|
484
|
|
|
485 } // namespace __sanitizer
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486
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|
|
487 #endif // SANITIZER_POSIX
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