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145
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1 //===-- asan_errors.cpp -----------------------------------------*- C++ -*-===//
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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 a part of AddressSanitizer, an address sanity checker.
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10 //
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11 // ASan implementation for error structures.
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "asan_errors.h"
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15 #include "asan_descriptions.h"
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16 #include "asan_mapping.h"
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17 #include "asan_report.h"
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18 #include "asan_stack.h"
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19 #include "sanitizer_common/sanitizer_stackdepot.h"
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20
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21 namespace __asan {
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22
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23 static void OnStackUnwind(const SignalContext &sig,
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24 const void *callback_context,
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25 BufferedStackTrace *stack) {
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26 bool fast = common_flags()->fast_unwind_on_fatal;
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27 #if SANITIZER_FREEBSD || SANITIZER_NETBSD
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28 // On FreeBSD the slow unwinding that leverages _Unwind_Backtrace()
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29 // yields the call stack of the signal's handler and not of the code
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30 // that raised the signal (as it does on Linux).
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31 fast = true;
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32 #endif
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33 // Tests and maybe some users expect that scariness is going to be printed
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34 // just before the stack. As only asan has scariness score we have no
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35 // corresponding code in the sanitizer_common and we use this callback to
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36 // print it.
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37 static_cast<const ScarinessScoreBase *>(callback_context)->Print();
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38 stack->Unwind(StackTrace::GetNextInstructionPc(sig.pc), sig.bp, sig.context,
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39 fast);
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40 }
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41
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42 void ErrorDeadlySignal::Print() {
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43 ReportDeadlySignal(signal, tid, &OnStackUnwind, &scariness);
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44 }
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45
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46 void ErrorDoubleFree::Print() {
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47 Decorator d;
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48 Printf("%s", d.Error());
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49 Report(
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50 "ERROR: AddressSanitizer: attempting %s on %p in thread %s:\n",
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51 scariness.GetDescription(), addr_description.addr,
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52 AsanThreadIdAndName(tid).c_str());
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53 Printf("%s", d.Default());
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54 scariness.Print();
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55 GET_STACK_TRACE_FATAL(second_free_stack->trace[0],
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56 second_free_stack->top_frame_bp);
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57 stack.Print();
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58 addr_description.Print();
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59 ReportErrorSummary(scariness.GetDescription(), &stack);
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60 }
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61
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62 void ErrorNewDeleteTypeMismatch::Print() {
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63 Decorator d;
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64 Printf("%s", d.Error());
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65 Report(
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66 "ERROR: AddressSanitizer: %s on %p in thread %s:\n",
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67 scariness.GetDescription(), addr_description.addr,
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68 AsanThreadIdAndName(tid).c_str());
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69 Printf("%s object passed to delete has wrong type:\n", d.Default());
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70 if (delete_size != 0) {
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71 Printf(
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72 " size of the allocated type: %zd bytes;\n"
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73 " size of the deallocated type: %zd bytes.\n",
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74 addr_description.chunk_access.chunk_size, delete_size);
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75 }
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76 const uptr user_alignment =
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77 addr_description.chunk_access.user_requested_alignment;
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78 if (delete_alignment != user_alignment) {
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79 char user_alignment_str[32];
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80 char delete_alignment_str[32];
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81 internal_snprintf(user_alignment_str, sizeof(user_alignment_str),
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82 "%zd bytes", user_alignment);
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83 internal_snprintf(delete_alignment_str, sizeof(delete_alignment_str),
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84 "%zd bytes", delete_alignment);
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85 static const char *kDefaultAlignment = "default-aligned";
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86 Printf(
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87 " alignment of the allocated type: %s;\n"
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88 " alignment of the deallocated type: %s.\n",
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89 user_alignment > 0 ? user_alignment_str : kDefaultAlignment,
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90 delete_alignment > 0 ? delete_alignment_str : kDefaultAlignment);
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91 }
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92 CHECK_GT(free_stack->size, 0);
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93 scariness.Print();
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94 GET_STACK_TRACE_FATAL(free_stack->trace[0], free_stack->top_frame_bp);
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95 stack.Print();
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96 addr_description.Print();
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97 ReportErrorSummary(scariness.GetDescription(), &stack);
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98 Report(
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99 "HINT: if you don't care about these errors you may set "
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100 "ASAN_OPTIONS=new_delete_type_mismatch=0\n");
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101 }
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102
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103 void ErrorFreeNotMalloced::Print() {
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104 Decorator d;
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105 Printf("%s", d.Error());
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106 Report(
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107 "ERROR: AddressSanitizer: attempting free on address "
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108 "which was not malloc()-ed: %p in thread %s\n",
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109 addr_description.Address(), AsanThreadIdAndName(tid).c_str());
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110 Printf("%s", d.Default());
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111 CHECK_GT(free_stack->size, 0);
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112 scariness.Print();
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113 GET_STACK_TRACE_FATAL(free_stack->trace[0], free_stack->top_frame_bp);
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114 stack.Print();
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115 addr_description.Print();
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116 ReportErrorSummary(scariness.GetDescription(), &stack);
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117 }
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118
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119 void ErrorAllocTypeMismatch::Print() {
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120 static const char *alloc_names[] = {"INVALID", "malloc", "operator new",
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121 "operator new []"};
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122 static const char *dealloc_names[] = {"INVALID", "free", "operator delete",
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123 "operator delete []"};
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124 CHECK_NE(alloc_type, dealloc_type);
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125 Decorator d;
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126 Printf("%s", d.Error());
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127 Report("ERROR: AddressSanitizer: %s (%s vs %s) on %p\n",
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128 scariness.GetDescription(), alloc_names[alloc_type],
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129 dealloc_names[dealloc_type], addr_description.Address());
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130 Printf("%s", d.Default());
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131 CHECK_GT(dealloc_stack->size, 0);
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132 scariness.Print();
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133 GET_STACK_TRACE_FATAL(dealloc_stack->trace[0], dealloc_stack->top_frame_bp);
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134 stack.Print();
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135 addr_description.Print();
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136 ReportErrorSummary(scariness.GetDescription(), &stack);
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137 Report(
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138 "HINT: if you don't care about these errors you may set "
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139 "ASAN_OPTIONS=alloc_dealloc_mismatch=0\n");
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140 }
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141
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142 void ErrorMallocUsableSizeNotOwned::Print() {
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143 Decorator d;
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144 Printf("%s", d.Error());
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145 Report(
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146 "ERROR: AddressSanitizer: attempting to call malloc_usable_size() for "
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147 "pointer which is not owned: %p\n",
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148 addr_description.Address());
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149 Printf("%s", d.Default());
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150 stack->Print();
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151 addr_description.Print();
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152 ReportErrorSummary(scariness.GetDescription(), stack);
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153 }
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154
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155 void ErrorSanitizerGetAllocatedSizeNotOwned::Print() {
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156 Decorator d;
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157 Printf("%s", d.Error());
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158 Report(
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159 "ERROR: AddressSanitizer: attempting to call "
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160 "__sanitizer_get_allocated_size() for pointer which is not owned: %p\n",
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161 addr_description.Address());
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162 Printf("%s", d.Default());
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163 stack->Print();
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164 addr_description.Print();
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165 ReportErrorSummary(scariness.GetDescription(), stack);
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166 }
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167
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168 void ErrorCallocOverflow::Print() {
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169 Decorator d;
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170 Printf("%s", d.Error());
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171 Report(
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172 "ERROR: AddressSanitizer: calloc parameters overflow: count * size "
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173 "(%zd * %zd) cannot be represented in type size_t (thread %s)\n",
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174 count, size, AsanThreadIdAndName(tid).c_str());
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175 Printf("%s", d.Default());
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176 stack->Print();
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177 PrintHintAllocatorCannotReturnNull();
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178 ReportErrorSummary(scariness.GetDescription(), stack);
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179 }
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180
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181 void ErrorReallocArrayOverflow::Print() {
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182 Decorator d;
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183 Printf("%s", d.Error());
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184 Report(
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185 "ERROR: AddressSanitizer: reallocarray parameters overflow: count * size "
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186 "(%zd * %zd) cannot be represented in type size_t (thread %s)\n",
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187 count, size, AsanThreadIdAndName(tid).c_str());
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188 Printf("%s", d.Default());
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189 stack->Print();
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190 PrintHintAllocatorCannotReturnNull();
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191 ReportErrorSummary(scariness.GetDescription(), stack);
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192 }
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193
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194 void ErrorPvallocOverflow::Print() {
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195 Decorator d;
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196 Printf("%s", d.Error());
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197 Report(
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198 "ERROR: AddressSanitizer: pvalloc parameters overflow: size 0x%zx "
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199 "rounded up to system page size 0x%zx cannot be represented in type "
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200 "size_t (thread %s)\n",
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201 size, GetPageSizeCached(), AsanThreadIdAndName(tid).c_str());
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202 Printf("%s", d.Default());
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203 stack->Print();
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204 PrintHintAllocatorCannotReturnNull();
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205 ReportErrorSummary(scariness.GetDescription(), stack);
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206 }
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207
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208 void ErrorInvalidAllocationAlignment::Print() {
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209 Decorator d;
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210 Printf("%s", d.Error());
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211 Report(
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212 "ERROR: AddressSanitizer: invalid allocation alignment: %zd, "
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213 "alignment must be a power of two (thread %s)\n",
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214 alignment, AsanThreadIdAndName(tid).c_str());
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215 Printf("%s", d.Default());
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216 stack->Print();
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217 PrintHintAllocatorCannotReturnNull();
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218 ReportErrorSummary(scariness.GetDescription(), stack);
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219 }
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220
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221 void ErrorInvalidAlignedAllocAlignment::Print() {
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222 Decorator d;
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223 Printf("%s", d.Error());
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224 #if SANITIZER_POSIX
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225 Report("ERROR: AddressSanitizer: invalid alignment requested in "
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226 "aligned_alloc: %zd, alignment must be a power of two and the "
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227 "requested size 0x%zx must be a multiple of alignment "
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228 "(thread %s)\n", alignment, size, AsanThreadIdAndName(tid).c_str());
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229 #else
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230 Report("ERROR: AddressSanitizer: invalid alignment requested in "
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231 "aligned_alloc: %zd, the requested size 0x%zx must be a multiple of "
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232 "alignment (thread %s)\n", alignment, size,
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233 AsanThreadIdAndName(tid).c_str());
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234 #endif
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235 Printf("%s", d.Default());
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236 stack->Print();
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237 PrintHintAllocatorCannotReturnNull();
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238 ReportErrorSummary(scariness.GetDescription(), stack);
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239 }
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240
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241 void ErrorInvalidPosixMemalignAlignment::Print() {
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242 Decorator d;
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243 Printf("%s", d.Error());
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244 Report(
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245 "ERROR: AddressSanitizer: invalid alignment requested in posix_memalign: "
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246 "%zd, alignment must be a power of two and a multiple of sizeof(void*) "
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247 "== %zd (thread %s)\n",
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248 alignment, sizeof(void *), AsanThreadIdAndName(tid).c_str());
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249 Printf("%s", d.Default());
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250 stack->Print();
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251 PrintHintAllocatorCannotReturnNull();
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252 ReportErrorSummary(scariness.GetDescription(), stack);
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253 }
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254
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255 void ErrorAllocationSizeTooBig::Print() {
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256 Decorator d;
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257 Printf("%s", d.Error());
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258 Report(
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259 "ERROR: AddressSanitizer: requested allocation size 0x%zx (0x%zx after "
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260 "adjustments for alignment, red zones etc.) exceeds maximum supported "
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261 "size of 0x%zx (thread %s)\n",
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262 user_size, total_size, max_size, AsanThreadIdAndName(tid).c_str());
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263 Printf("%s", d.Default());
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264 stack->Print();
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265 PrintHintAllocatorCannotReturnNull();
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266 ReportErrorSummary(scariness.GetDescription(), stack);
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267 }
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268
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269 void ErrorRssLimitExceeded::Print() {
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270 Decorator d;
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271 Printf("%s", d.Error());
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272 Report(
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273 "ERROR: AddressSanitizer: specified RSS limit exceeded, currently set to "
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274 "soft_rss_limit_mb=%zd\n", common_flags()->soft_rss_limit_mb);
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275 Printf("%s", d.Default());
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276 stack->Print();
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277 PrintHintAllocatorCannotReturnNull();
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278 ReportErrorSummary(scariness.GetDescription(), stack);
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279 }
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280
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281 void ErrorOutOfMemory::Print() {
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282 Decorator d;
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283 Printf("%s", d.Error());
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284 Report(
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285 "ERROR: AddressSanitizer: allocator is out of memory trying to allocate "
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286 "0x%zx bytes\n", requested_size);
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287 Printf("%s", d.Default());
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288 stack->Print();
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289 PrintHintAllocatorCannotReturnNull();
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290 ReportErrorSummary(scariness.GetDescription(), stack);
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291 }
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292
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293 void ErrorStringFunctionMemoryRangesOverlap::Print() {
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294 Decorator d;
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295 char bug_type[100];
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296 internal_snprintf(bug_type, sizeof(bug_type), "%s-param-overlap", function);
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297 Printf("%s", d.Error());
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298 Report(
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299 "ERROR: AddressSanitizer: %s: memory ranges [%p,%p) and [%p, %p) "
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300 "overlap\n",
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301 bug_type, addr1_description.Address(),
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302 addr1_description.Address() + length1, addr2_description.Address(),
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303 addr2_description.Address() + length2);
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304 Printf("%s", d.Default());
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305 scariness.Print();
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306 stack->Print();
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307 addr1_description.Print();
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308 addr2_description.Print();
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309 ReportErrorSummary(bug_type, stack);
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310 }
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311
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312 void ErrorStringFunctionSizeOverflow::Print() {
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313 Decorator d;
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314 Printf("%s", d.Error());
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315 Report("ERROR: AddressSanitizer: %s: (size=%zd)\n",
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316 scariness.GetDescription(), size);
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317 Printf("%s", d.Default());
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318 scariness.Print();
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319 stack->Print();
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320 addr_description.Print();
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321 ReportErrorSummary(scariness.GetDescription(), stack);
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322 }
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323
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324 void ErrorBadParamsToAnnotateContiguousContainer::Print() {
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325 Report(
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326 "ERROR: AddressSanitizer: bad parameters to "
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327 "__sanitizer_annotate_contiguous_container:\n"
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328 " beg : %p\n"
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329 " end : %p\n"
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330 " old_mid : %p\n"
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331 " new_mid : %p\n",
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332 beg, end, old_mid, new_mid);
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333 uptr granularity = SHADOW_GRANULARITY;
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334 if (!IsAligned(beg, granularity))
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335 Report("ERROR: beg is not aligned by %d\n", granularity);
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336 stack->Print();
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337 ReportErrorSummary(scariness.GetDescription(), stack);
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338 }
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339
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340 void ErrorODRViolation::Print() {
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341 Decorator d;
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342 Printf("%s", d.Error());
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343 Report("ERROR: AddressSanitizer: %s (%p):\n", scariness.GetDescription(),
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344 global1.beg);
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345 Printf("%s", d.Default());
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346 InternalScopedString g1_loc(256), g2_loc(256);
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347 PrintGlobalLocation(&g1_loc, global1);
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348 PrintGlobalLocation(&g2_loc, global2);
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349 Printf(" [1] size=%zd '%s' %s\n", global1.size,
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350 MaybeDemangleGlobalName(global1.name), g1_loc.data());
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351 Printf(" [2] size=%zd '%s' %s\n", global2.size,
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352 MaybeDemangleGlobalName(global2.name), g2_loc.data());
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353 if (stack_id1 && stack_id2) {
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354 Printf("These globals were registered at these points:\n");
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355 Printf(" [1]:\n");
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356 StackDepotGet(stack_id1).Print();
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357 Printf(" [2]:\n");
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358 StackDepotGet(stack_id2).Print();
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359 }
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360 Report(
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361 "HINT: if you don't care about these errors you may set "
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362 "ASAN_OPTIONS=detect_odr_violation=0\n");
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363 InternalScopedString error_msg(256);
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364 error_msg.append("%s: global '%s' at %s", scariness.GetDescription(),
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365 MaybeDemangleGlobalName(global1.name), g1_loc.data());
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366 ReportErrorSummary(error_msg.data());
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367 }
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368
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369 void ErrorInvalidPointerPair::Print() {
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370 Decorator d;
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371 Printf("%s", d.Error());
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372 Report("ERROR: AddressSanitizer: %s: %p %p\n", scariness.GetDescription(),
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373 addr1_description.Address(), addr2_description.Address());
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374 Printf("%s", d.Default());
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375 GET_STACK_TRACE_FATAL(pc, bp);
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376 stack.Print();
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377 addr1_description.Print();
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378 addr2_description.Print();
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379 ReportErrorSummary(scariness.GetDescription(), &stack);
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380 }
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381
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382 static bool AdjacentShadowValuesAreFullyPoisoned(u8 *s) {
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383 return s[-1] > 127 && s[1] > 127;
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384 }
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385
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386 ErrorGeneric::ErrorGeneric(u32 tid, uptr pc_, uptr bp_, uptr sp_, uptr addr,
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387 bool is_write_, uptr access_size_)
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388 : ErrorBase(tid),
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389 addr_description(addr, access_size_, /*shouldLockThreadRegistry=*/false),
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390 pc(pc_),
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391 bp(bp_),
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392 sp(sp_),
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393 access_size(access_size_),
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394 is_write(is_write_),
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395 shadow_val(0) {
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396 scariness.Clear();
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397 if (access_size) {
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398 if (access_size <= 9) {
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399 char desr[] = "?-byte";
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400 desr[0] = '0' + access_size;
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401 scariness.Scare(access_size + access_size / 2, desr);
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402 } else if (access_size >= 10) {
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403 scariness.Scare(15, "multi-byte");
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404 }
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405 is_write ? scariness.Scare(20, "write") : scariness.Scare(1, "read");
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406
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407 // Determine the error type.
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408 bug_descr = "unknown-crash";
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409 if (AddrIsInMem(addr)) {
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410 u8 *shadow_addr = (u8 *)MemToShadow(addr);
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411 // If we are accessing 16 bytes, look at the second shadow byte.
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412 if (*shadow_addr == 0 && access_size > SHADOW_GRANULARITY) shadow_addr++;
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413 // If we are in the partial right redzone, look at the next shadow byte.
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414 if (*shadow_addr > 0 && *shadow_addr < 128) shadow_addr++;
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415 bool far_from_bounds = false;
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416 shadow_val = *shadow_addr;
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417 int bug_type_score = 0;
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418 // For use-after-frees reads are almost as bad as writes.
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419 int read_after_free_bonus = 0;
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420 switch (shadow_val) {
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421 case kAsanHeapLeftRedzoneMagic:
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422 case kAsanArrayCookieMagic:
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423 bug_descr = "heap-buffer-overflow";
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424 bug_type_score = 10;
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425 far_from_bounds = AdjacentShadowValuesAreFullyPoisoned(shadow_addr);
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426 break;
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427 case kAsanHeapFreeMagic:
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428 bug_descr = "heap-use-after-free";
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429 bug_type_score = 20;
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430 if (!is_write) read_after_free_bonus = 18;
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431 break;
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432 case kAsanStackLeftRedzoneMagic:
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433 bug_descr = "stack-buffer-underflow";
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434 bug_type_score = 25;
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435 far_from_bounds = AdjacentShadowValuesAreFullyPoisoned(shadow_addr);
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436 break;
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|
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437 case kAsanInitializationOrderMagic:
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|
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438 bug_descr = "initialization-order-fiasco";
|
|
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439 bug_type_score = 1;
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|
|
440 break;
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|
|
441 case kAsanStackMidRedzoneMagic:
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|
|
442 case kAsanStackRightRedzoneMagic:
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|
|
443 bug_descr = "stack-buffer-overflow";
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|
|
444 bug_type_score = 25;
|
|
|
445 far_from_bounds = AdjacentShadowValuesAreFullyPoisoned(shadow_addr);
|
|
|
446 break;
|
|
|
447 case kAsanStackAfterReturnMagic:
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|
|
448 bug_descr = "stack-use-after-return";
|
|
|
449 bug_type_score = 30;
|
|
|
450 if (!is_write) read_after_free_bonus = 18;
|
|
|
451 break;
|
|
|
452 case kAsanUserPoisonedMemoryMagic:
|
|
|
453 bug_descr = "use-after-poison";
|
|
|
454 bug_type_score = 20;
|
|
|
455 break;
|
|
|
456 case kAsanContiguousContainerOOBMagic:
|
|
|
457 bug_descr = "container-overflow";
|
|
|
458 bug_type_score = 10;
|
|
|
459 break;
|
|
|
460 case kAsanStackUseAfterScopeMagic:
|
|
|
461 bug_descr = "stack-use-after-scope";
|
|
|
462 bug_type_score = 10;
|
|
|
463 break;
|
|
|
464 case kAsanGlobalRedzoneMagic:
|
|
|
465 bug_descr = "global-buffer-overflow";
|
|
|
466 bug_type_score = 10;
|
|
|
467 far_from_bounds = AdjacentShadowValuesAreFullyPoisoned(shadow_addr);
|
|
|
468 break;
|
|
|
469 case kAsanIntraObjectRedzone:
|
|
|
470 bug_descr = "intra-object-overflow";
|
|
|
471 bug_type_score = 10;
|
|
|
472 break;
|
|
|
473 case kAsanAllocaLeftMagic:
|
|
|
474 case kAsanAllocaRightMagic:
|
|
|
475 bug_descr = "dynamic-stack-buffer-overflow";
|
|
|
476 bug_type_score = 25;
|
|
|
477 far_from_bounds = AdjacentShadowValuesAreFullyPoisoned(shadow_addr);
|
|
|
478 break;
|
|
|
479 }
|
|
|
480 scariness.Scare(bug_type_score + read_after_free_bonus, bug_descr);
|
|
|
481 if (far_from_bounds) scariness.Scare(10, "far-from-bounds");
|
|
|
482 }
|
|
|
483 }
|
|
|
484 }
|
|
|
485
|
|
|
486 static void PrintContainerOverflowHint() {
|
|
|
487 Printf("HINT: if you don't care about these errors you may set "
|
|
|
488 "ASAN_OPTIONS=detect_container_overflow=0.\n"
|
|
|
489 "If you suspect a false positive see also: "
|
|
|
490 "https://github.com/google/sanitizers/wiki/"
|
|
|
491 "AddressSanitizerContainerOverflow.\n");
|
|
|
492 }
|
|
|
493
|
|
|
494 static void PrintShadowByte(InternalScopedString *str, const char *before,
|
|
|
495 u8 byte, const char *after = "\n") {
|
|
|
496 PrintMemoryByte(str, before, byte, /*in_shadow*/true, after);
|
|
|
497 }
|
|
|
498
|
|
|
499 static void PrintLegend(InternalScopedString *str) {
|
|
|
500 str->append(
|
|
|
501 "Shadow byte legend (one shadow byte represents %d "
|
|
|
502 "application bytes):\n",
|
|
|
503 (int)SHADOW_GRANULARITY);
|
|
|
504 PrintShadowByte(str, " Addressable: ", 0);
|
|
|
505 str->append(" Partially addressable: ");
|
|
|
506 for (u8 i = 1; i < SHADOW_GRANULARITY; i++) PrintShadowByte(str, "", i, " ");
|
|
|
507 str->append("\n");
|
|
|
508 PrintShadowByte(str, " Heap left redzone: ",
|
|
|
509 kAsanHeapLeftRedzoneMagic);
|
|
|
510 PrintShadowByte(str, " Freed heap region: ", kAsanHeapFreeMagic);
|
|
|
511 PrintShadowByte(str, " Stack left redzone: ",
|
|
|
512 kAsanStackLeftRedzoneMagic);
|
|
|
513 PrintShadowByte(str, " Stack mid redzone: ",
|
|
|
514 kAsanStackMidRedzoneMagic);
|
|
|
515 PrintShadowByte(str, " Stack right redzone: ",
|
|
|
516 kAsanStackRightRedzoneMagic);
|
|
|
517 PrintShadowByte(str, " Stack after return: ",
|
|
|
518 kAsanStackAfterReturnMagic);
|
|
|
519 PrintShadowByte(str, " Stack use after scope: ",
|
|
|
520 kAsanStackUseAfterScopeMagic);
|
|
|
521 PrintShadowByte(str, " Global redzone: ", kAsanGlobalRedzoneMagic);
|
|
|
522 PrintShadowByte(str, " Global init order: ",
|
|
|
523 kAsanInitializationOrderMagic);
|
|
|
524 PrintShadowByte(str, " Poisoned by user: ",
|
|
|
525 kAsanUserPoisonedMemoryMagic);
|
|
|
526 PrintShadowByte(str, " Container overflow: ",
|
|
|
527 kAsanContiguousContainerOOBMagic);
|
|
|
528 PrintShadowByte(str, " Array cookie: ",
|
|
|
529 kAsanArrayCookieMagic);
|
|
|
530 PrintShadowByte(str, " Intra object redzone: ",
|
|
|
531 kAsanIntraObjectRedzone);
|
|
|
532 PrintShadowByte(str, " ASan internal: ", kAsanInternalHeapMagic);
|
|
|
533 PrintShadowByte(str, " Left alloca redzone: ", kAsanAllocaLeftMagic);
|
|
|
534 PrintShadowByte(str, " Right alloca redzone: ", kAsanAllocaRightMagic);
|
|
|
535 PrintShadowByte(str, " Shadow gap: ", kAsanShadowGap);
|
|
|
536 }
|
|
|
537
|
|
|
538 static void PrintShadowBytes(InternalScopedString *str, const char *before,
|
|
|
539 u8 *bytes, u8 *guilty, uptr n) {
|
|
|
540 Decorator d;
|
|
|
541 if (before) str->append("%s%p:", before, bytes);
|
|
|
542 for (uptr i = 0; i < n; i++) {
|
|
|
543 u8 *p = bytes + i;
|
|
|
544 const char *before =
|
|
|
545 p == guilty ? "[" : (p - 1 == guilty && i != 0) ? "" : " ";
|
|
|
546 const char *after = p == guilty ? "]" : "";
|
|
|
547 PrintShadowByte(str, before, *p, after);
|
|
|
548 }
|
|
|
549 str->append("\n");
|
|
|
550 }
|
|
|
551
|
|
|
552 static void PrintShadowMemoryForAddress(uptr addr) {
|
|
|
553 if (!AddrIsInMem(addr)) return;
|
|
|
554 uptr shadow_addr = MemToShadow(addr);
|
|
|
555 const uptr n_bytes_per_row = 16;
|
|
|
556 uptr aligned_shadow = shadow_addr & ~(n_bytes_per_row - 1);
|
|
|
557 InternalScopedString str(4096 * 8);
|
|
|
558 str.append("Shadow bytes around the buggy address:\n");
|
|
|
559 for (int i = -5; i <= 5; i++) {
|
|
|
560 uptr row_shadow_addr = aligned_shadow + i * n_bytes_per_row;
|
|
|
561 // Skip rows that would be outside the shadow range. This can happen when
|
|
|
562 // the user address is near the bottom, top, or shadow gap of the address
|
|
|
563 // space.
|
|
|
564 if (!AddrIsInShadow(row_shadow_addr)) continue;
|
|
|
565 const char *prefix = (i == 0) ? "=>" : " ";
|
|
|
566 PrintShadowBytes(&str, prefix, (u8 *)row_shadow_addr, (u8 *)shadow_addr,
|
|
|
567 n_bytes_per_row);
|
|
|
568 }
|
|
|
569 if (flags()->print_legend) PrintLegend(&str);
|
|
|
570 Printf("%s", str.data());
|
|
|
571 }
|
|
|
572
|
|
|
573 void ErrorGeneric::Print() {
|
|
|
574 Decorator d;
|
|
|
575 Printf("%s", d.Error());
|
|
|
576 uptr addr = addr_description.Address();
|
|
|
577 Report("ERROR: AddressSanitizer: %s on address %p at pc %p bp %p sp %p\n",
|
|
|
578 bug_descr, (void *)addr, pc, bp, sp);
|
|
|
579 Printf("%s", d.Default());
|
|
|
580
|
|
|
581 Printf("%s%s of size %zu at %p thread %s%s\n", d.Access(),
|
|
|
582 access_size ? (is_write ? "WRITE" : "READ") : "ACCESS", access_size,
|
|
|
583 (void *)addr, AsanThreadIdAndName(tid).c_str(), d.Default());
|
|
|
584
|
|
|
585 scariness.Print();
|
|
|
586 GET_STACK_TRACE_FATAL(pc, bp);
|
|
|
587 stack.Print();
|
|
|
588
|
|
|
589 // Pass bug_descr because we have a special case for
|
|
|
590 // initialization-order-fiasco
|
|
|
591 addr_description.Print(bug_descr);
|
|
|
592 if (shadow_val == kAsanContiguousContainerOOBMagic)
|
|
|
593 PrintContainerOverflowHint();
|
|
|
594 ReportErrorSummary(bug_descr, &stack);
|
|
|
595 PrintShadowMemoryForAddress(addr);
|
|
|
596 }
|
|
|
597
|
|
|
598 } // namespace __asan
|
