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annotate projects/compiler-rt/lib/sanitizer_common/sanitizer_fuchsia.cc @ 214:0cf2d4ade63d

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author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Tue, 13 Jul 2021 09:53:52 +0900
parents f476a9ba4795
children
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1 //===-- sanitizer_fuchsia.cc ---------------------------------------------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===---------------------------------------------------------------------===//
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9 //
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10 // This file is shared between AddressSanitizer and other sanitizer
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11 // run-time libraries and implements Fuchsia-specific functions from
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12 // sanitizer_common.h.
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13 //===---------------------------------------------------------------------===//
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14
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15 #include "sanitizer_fuchsia.h"
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16 #if SANITIZER_FUCHSIA
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17
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18 #include "sanitizer_common.h"
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19 #include "sanitizer_libc.h"
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20 #include "sanitizer_mutex.h"
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21 #include "sanitizer_stacktrace.h"
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22
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23 #include <limits.h>
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24 #include <pthread.h>
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25 #include <stdlib.h>
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26 #include <unistd.h>
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27 #include <unwind.h>
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28 #include <zircon/errors.h>
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29 #include <zircon/process.h>
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30 #include <zircon/syscalls.h>
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31
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32 namespace __sanitizer {
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33
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34 void NORETURN internal__exit(int exitcode) { _zx_process_exit(exitcode); }
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35
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36 uptr internal_sched_yield() {
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37 zx_status_t status = _zx_nanosleep(0);
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38 CHECK_EQ(status, ZX_OK);
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39 return 0; // Why doesn't this return void?
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40 }
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41
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42 static void internal_nanosleep(zx_time_t ns) {
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43 zx_status_t status = _zx_nanosleep(_zx_deadline_after(ns));
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44 CHECK_EQ(status, ZX_OK);
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45 }
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46
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47 unsigned int internal_sleep(unsigned int seconds) {
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48 internal_nanosleep(ZX_SEC(seconds));
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49 return 0;
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50 }
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51
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52 u64 NanoTime() { return _zx_clock_get(ZX_CLOCK_UTC); }
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53
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54 u64 MonotonicNanoTime() { return _zx_clock_get(ZX_CLOCK_MONOTONIC); }
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55
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56 uptr internal_getpid() {
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57 zx_info_handle_basic_t info;
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58 zx_status_t status =
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59 _zx_object_get_info(_zx_process_self(), ZX_INFO_HANDLE_BASIC, &info,
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60 sizeof(info), NULL, NULL);
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61 CHECK_EQ(status, ZX_OK);
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62 uptr pid = static_cast<uptr>(info.koid);
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63 CHECK_EQ(pid, info.koid);
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64 return pid;
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65 }
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66
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67 uptr GetThreadSelf() { return reinterpret_cast<uptr>(thrd_current()); }
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68
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69 uptr GetTid() { return GetThreadSelf(); }
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70
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71 void Abort() { abort(); }
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72
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73 int Atexit(void (*function)(void)) { return atexit(function); }
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74
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75 void SleepForSeconds(int seconds) { internal_sleep(seconds); }
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76
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77 void SleepForMillis(int millis) { internal_nanosleep(ZX_MSEC(millis)); }
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78
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79 void GetThreadStackTopAndBottom(bool, uptr *stack_top, uptr *stack_bottom) {
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80 pthread_attr_t attr;
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81 CHECK_EQ(pthread_getattr_np(pthread_self(), &attr), 0);
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82 void *base;
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83 size_t size;
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84 CHECK_EQ(pthread_attr_getstack(&attr, &base, &size), 0);
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85 CHECK_EQ(pthread_attr_destroy(&attr), 0);
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86
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87 *stack_bottom = reinterpret_cast<uptr>(base);
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88 *stack_top = *stack_bottom + size;
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89 }
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90
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91 void MaybeReexec() {}
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92 void PrepareForSandboxing(__sanitizer_sandbox_arguments *args) {}
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93 void DisableCoreDumperIfNecessary() {}
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94 void InstallDeadlySignalHandlers(SignalHandlerType handler) {}
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95 void StartReportDeadlySignal() {}
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96 void ReportDeadlySignal(const SignalContext &sig, u32 tid,
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97 UnwindSignalStackCallbackType unwind,
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98 const void *unwind_context) {}
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99 void SetAlternateSignalStack() {}
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100 void UnsetAlternateSignalStack() {}
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101 void InitTlsSize() {}
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102
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103 void PrintModuleMap() {}
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104
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105 bool SignalContext::IsStackOverflow() const { return false; }
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106 void SignalContext::DumpAllRegisters(void *context) { UNIMPLEMENTED(); }
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107 const char *SignalContext::Describe() const { UNIMPLEMENTED(); }
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108
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109 struct UnwindTraceArg {
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110 BufferedStackTrace *stack;
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111 u32 max_depth;
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112 };
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113
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114 _Unwind_Reason_Code Unwind_Trace(struct _Unwind_Context *ctx, void *param) {
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115 UnwindTraceArg *arg = static_cast<UnwindTraceArg *>(param);
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116 CHECK_LT(arg->stack->size, arg->max_depth);
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117 uptr pc = _Unwind_GetIP(ctx);
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118 if (pc < PAGE_SIZE) return _URC_NORMAL_STOP;
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119 arg->stack->trace_buffer[arg->stack->size++] = pc;
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120 return (arg->stack->size == arg->max_depth ? _URC_NORMAL_STOP
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121 : _URC_NO_REASON);
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122 }
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123
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124 void BufferedStackTrace::SlowUnwindStack(uptr pc, u32 max_depth) {
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125 CHECK_GE(max_depth, 2);
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126 size = 0;
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127 UnwindTraceArg arg = {this, Min(max_depth + 1, kStackTraceMax)};
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128 _Unwind_Backtrace(Unwind_Trace, &arg);
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129 CHECK_GT(size, 0);
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130 // We need to pop a few frames so that pc is on top.
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131 uptr to_pop = LocatePcInTrace(pc);
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132 // trace_buffer[0] belongs to the current function so we always pop it,
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133 // unless there is only 1 frame in the stack trace (1 frame is always better
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134 // than 0!).
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135 PopStackFrames(Min(to_pop, static_cast<uptr>(1)));
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136 trace_buffer[0] = pc;
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137 }
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138
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139 void BufferedStackTrace::SlowUnwindStackWithContext(uptr pc, void *context,
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140 u32 max_depth) {
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141 CHECK_NE(context, nullptr);
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142 UNREACHABLE("signal context doesn't exist");
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143 }
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144
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145 enum MutexState : int { MtxUnlocked = 0, MtxLocked = 1, MtxSleeping = 2 };
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146
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147 BlockingMutex::BlockingMutex() {
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148 // NOTE! It's important that this use internal_memset, because plain
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149 // memset might be intercepted (e.g., actually be __asan_memset).
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150 // Defining this so the compiler initializes each field, e.g.:
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151 // BlockingMutex::BlockingMutex() : BlockingMutex(LINKER_INITIALIZED) {}
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152 // might result in the compiler generating a call to memset, which would
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153 // have the same problem.
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154 internal_memset(this, 0, sizeof(*this));
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155 }
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156
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157 void BlockingMutex::Lock() {
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158 CHECK_EQ(owner_, 0);
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159 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_);
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160 if (atomic_exchange(m, MtxLocked, memory_order_acquire) == MtxUnlocked)
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161 return;
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162 while (atomic_exchange(m, MtxSleeping, memory_order_acquire) != MtxUnlocked) {
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163 zx_status_t status = _zx_futex_wait(reinterpret_cast<zx_futex_t *>(m),
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164 MtxSleeping, ZX_TIME_INFINITE);
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165 if (status != ZX_ERR_BAD_STATE) // Normal race.
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166 CHECK_EQ(status, ZX_OK);
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167 }
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168 }
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169
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170 void BlockingMutex::Unlock() {
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171 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_);
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172 u32 v = atomic_exchange(m, MtxUnlocked, memory_order_release);
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173 CHECK_NE(v, MtxUnlocked);
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174 if (v == MtxSleeping) {
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175 zx_status_t status = _zx_futex_wake(reinterpret_cast<zx_futex_t *>(m), 1);
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176 CHECK_EQ(status, ZX_OK);
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177 }
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178 }
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179
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180 void BlockingMutex::CheckLocked() {
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181 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_);
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182 CHECK_NE(MtxUnlocked, atomic_load(m, memory_order_relaxed));
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183 }
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184
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185 uptr GetPageSize() { return PAGE_SIZE; }
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186
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187 uptr GetMmapGranularity() { return PAGE_SIZE; }
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188
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189 sanitizer_shadow_bounds_t ShadowBounds;
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190
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191 uptr GetMaxUserVirtualAddress() {
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192 ShadowBounds = __sanitizer_shadow_bounds();
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193 return ShadowBounds.memory_limit - 1;
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194 }
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195
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196 uptr GetMaxVirtualAddress() { return GetMaxUserVirtualAddress(); }
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197
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198 static void *DoAnonymousMmapOrDie(uptr size, const char *mem_type,
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199 bool raw_report, bool die_for_nomem) {
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200 size = RoundUpTo(size, PAGE_SIZE);
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201
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202 zx_handle_t vmo;
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203 zx_status_t status = _zx_vmo_create(size, 0, &vmo);
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204 if (status != ZX_OK) {
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205 if (status != ZX_ERR_NO_MEMORY || die_for_nomem)
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206 ReportMmapFailureAndDie(size, mem_type, "zx_vmo_create", status,
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207 raw_report);
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208 return nullptr;
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209 }
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210 _zx_object_set_property(vmo, ZX_PROP_NAME, mem_type,
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211 internal_strlen(mem_type));
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212
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213 // TODO(mcgrathr): Maybe allocate a VMAR for all sanitizer heap and use that?
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214 uintptr_t addr;
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215 status = _zx_vmar_map(_zx_vmar_root_self(), 0, vmo, 0, size,
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216 ZX_VM_FLAG_PERM_READ | ZX_VM_FLAG_PERM_WRITE, &addr);
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217 _zx_handle_close(vmo);
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218
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219 if (status != ZX_OK) {
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220 if (status != ZX_ERR_NO_MEMORY || die_for_nomem)
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221 ReportMmapFailureAndDie(size, mem_type, "zx_vmar_map", status,
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222 raw_report);
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223 return nullptr;
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224 }
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225
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226 IncreaseTotalMmap(size);
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227
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228 return reinterpret_cast<void *>(addr);
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229 }
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230
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231 void *MmapOrDie(uptr size, const char *mem_type, bool raw_report) {
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232 return DoAnonymousMmapOrDie(size, mem_type, raw_report, true);
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233 }
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234
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235 void *MmapNoReserveOrDie(uptr size, const char *mem_type) {
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236 return MmapOrDie(size, mem_type);
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237 }
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238
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239 void *MmapOrDieOnFatalError(uptr size, const char *mem_type) {
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240 return DoAnonymousMmapOrDie(size, mem_type, false, false);
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241 }
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242
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243 uptr ReservedAddressRange::Init(uptr init_size, const char *name,
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244 uptr fixed_addr) {
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245 init_size = RoundUpTo(init_size, PAGE_SIZE);
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246 DCHECK_EQ(os_handle_, ZX_HANDLE_INVALID);
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247 uintptr_t base;
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248 zx_handle_t vmar;
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249 zx_status_t status =
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250 _zx_vmar_allocate(_zx_vmar_root_self(), 0, init_size,
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251 ZX_VM_FLAG_CAN_MAP_READ | ZX_VM_FLAG_CAN_MAP_WRITE |
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252 ZX_VM_FLAG_CAN_MAP_SPECIFIC,
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253 &vmar, &base);
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254 if (status != ZX_OK)
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255 ReportMmapFailureAndDie(init_size, name, "zx_vmar_allocate", status);
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256 base_ = reinterpret_cast<void *>(base);
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257 size_ = init_size;
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258 name_ = name;
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259 os_handle_ = vmar;
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260
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261 return reinterpret_cast<uptr>(base_);
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262 }
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263
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264 static uptr DoMmapFixedOrDie(zx_handle_t vmar, uptr fixed_addr, uptr map_size,
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265 void *base, const char *name, bool die_for_nomem) {
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266 uptr offset = fixed_addr - reinterpret_cast<uptr>(base);
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267 map_size = RoundUpTo(map_size, PAGE_SIZE);
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268 zx_handle_t vmo;
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269 zx_status_t status = _zx_vmo_create(map_size, 0, &vmo);
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270 if (status != ZX_OK) {
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271 if (status != ZX_ERR_NO_MEMORY || die_for_nomem)
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272 ReportMmapFailureAndDie(map_size, name, "zx_vmo_create", status);
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273 return 0;
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274 }
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275 _zx_object_set_property(vmo, ZX_PROP_NAME, name, sizeof(name) - 1);
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276 DCHECK_GE(base + size_, map_size + offset);
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277 uintptr_t addr;
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278
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279 status = _zx_vmar_map(
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280 vmar, offset, vmo, 0, map_size,
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281 ZX_VM_FLAG_PERM_READ | ZX_VM_FLAG_PERM_WRITE | ZX_VM_FLAG_SPECIFIC,
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282 &addr);
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283 _zx_handle_close(vmo);
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284 if (status != ZX_OK) {
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285 if (status != ZX_ERR_NO_MEMORY || die_for_nomem) {
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286 ReportMmapFailureAndDie(map_size, name, "zx_vmar_map", status);
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287 }
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288 return 0;
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289 }
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290 IncreaseTotalMmap(map_size);
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291 return addr;
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292 }
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293
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294 uptr ReservedAddressRange::Map(uptr fixed_addr, uptr map_size) {
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295 return DoMmapFixedOrDie(os_handle_, fixed_addr, map_size, base_,
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296 name_, false);
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297 }
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298
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299 uptr ReservedAddressRange::MapOrDie(uptr fixed_addr, uptr map_size) {
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300 return DoMmapFixedOrDie(os_handle_, fixed_addr, map_size, base_,
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301 name_, true);
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302 }
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303
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304 void UnmapOrDieVmar(void *addr, uptr size, zx_handle_t target_vmar) {
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305 if (!addr || !size) return;
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306 size = RoundUpTo(size, PAGE_SIZE);
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307
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308 zx_status_t status =
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309 _zx_vmar_unmap(target_vmar, reinterpret_cast<uintptr_t>(addr), size);
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310 if (status != ZX_OK) {
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311 Report("ERROR: %s failed to deallocate 0x%zx (%zd) bytes at address %p\n",
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312 SanitizerToolName, size, size, addr);
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313 CHECK("unable to unmap" && 0);
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314 }
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315
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316 DecreaseTotalMmap(size);
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317 }
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318
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319 void ReservedAddressRange::Unmap(uptr fixed_addr, uptr size) {
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320 uptr offset = fixed_addr - reinterpret_cast<uptr>(base_);
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321 uptr addr = reinterpret_cast<uptr>(base_) + offset;
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322 void *addr_as_void = reinterpret_cast<void *>(addr);
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323 uptr base_as_uptr = reinterpret_cast<uptr>(base_);
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324 // Only unmap at the beginning or end of the range.
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325 CHECK((addr_as_void == base_) || (addr + size == base_as_uptr + size_));
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326 CHECK_LE(size, size_);
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327 UnmapOrDieVmar(reinterpret_cast<void *>(addr), size,
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328 static_cast<zx_handle_t>(os_handle_));
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329 if (addr_as_void == base_) {
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330 base_ = reinterpret_cast<void *>(addr + size);
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331 }
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332 size_ = size_ - size;
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333 }
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334
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335 // This should never be called.
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336 void *MmapFixedNoAccess(uptr fixed_addr, uptr size, const char *name) {
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337 UNIMPLEMENTED();
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338 }
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339
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340 void *MmapAlignedOrDieOnFatalError(uptr size, uptr alignment,
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341 const char *mem_type) {
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342 CHECK_GE(size, PAGE_SIZE);
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343 CHECK(IsPowerOfTwo(size));
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344 CHECK(IsPowerOfTwo(alignment));
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345
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346 zx_handle_t vmo;
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347 zx_status_t status = _zx_vmo_create(size, 0, &vmo);
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348 if (status != ZX_OK) {
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349 if (status != ZX_ERR_NO_MEMORY)
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350 ReportMmapFailureAndDie(size, mem_type, "zx_vmo_create", status, false);
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351 return nullptr;
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352 }
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353 _zx_object_set_property(vmo, ZX_PROP_NAME, mem_type,
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354 internal_strlen(mem_type));
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355
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356 // TODO(mcgrathr): Maybe allocate a VMAR for all sanitizer heap and use that?
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357
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358 // Map a larger size to get a chunk of address space big enough that
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359 // it surely contains an aligned region of the requested size. Then
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360 // overwrite the aligned middle portion with a mapping from the
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361 // beginning of the VMO, and unmap the excess before and after.
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362 size_t map_size = size + alignment;
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363 uintptr_t addr;
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364 status = _zx_vmar_map(_zx_vmar_root_self(), 0, vmo, 0, map_size,
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365 ZX_VM_FLAG_PERM_READ | ZX_VM_FLAG_PERM_WRITE, &addr);
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366 if (status == ZX_OK) {
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367 uintptr_t map_addr = addr;
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368 uintptr_t map_end = map_addr + map_size;
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369 addr = RoundUpTo(map_addr, alignment);
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370 uintptr_t end = addr + size;
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371 if (addr != map_addr) {
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372 zx_info_vmar_t info;
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373 status = _zx_object_get_info(_zx_vmar_root_self(), ZX_INFO_VMAR, &info,
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374 sizeof(info), NULL, NULL);
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375 if (status == ZX_OK) {
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376 uintptr_t new_addr;
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377 status =
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378 _zx_vmar_map(_zx_vmar_root_self(), addr - info.base, vmo, 0, size,
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379 ZX_VM_FLAG_PERM_READ | ZX_VM_FLAG_PERM_WRITE |
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380 ZX_VM_FLAG_SPECIFIC_OVERWRITE,
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381 &new_addr);
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382 if (status == ZX_OK) CHECK_EQ(new_addr, addr);
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383 }
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384 }
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385 if (status == ZX_OK && addr != map_addr)
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386 status = _zx_vmar_unmap(_zx_vmar_root_self(), map_addr, addr - map_addr);
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387 if (status == ZX_OK && end != map_end)
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388 status = _zx_vmar_unmap(_zx_vmar_root_self(), end, map_end - end);
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389 }
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390 _zx_handle_close(vmo);
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391
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392 if (status != ZX_OK) {
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393 if (status != ZX_ERR_NO_MEMORY)
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394 ReportMmapFailureAndDie(size, mem_type, "zx_vmar_map", status, false);
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395 return nullptr;
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396 }
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397
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398 IncreaseTotalMmap(size);
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399
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400 return reinterpret_cast<void *>(addr);
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401 }
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402
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403 void UnmapOrDie(void *addr, uptr size) {
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404 UnmapOrDieVmar(addr, size, _zx_vmar_root_self());
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405 }
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406
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407 // This is used on the shadow mapping, which cannot be changed.
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408 // Zircon doesn't have anything like MADV_DONTNEED.
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409 void ReleaseMemoryPagesToOS(uptr beg, uptr end) {}
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410
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411 void DumpProcessMap() {
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412 // TODO(mcgrathr): write it
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413 return;
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414 }
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415
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416 bool IsAccessibleMemoryRange(uptr beg, uptr size) {
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417 // TODO(mcgrathr): Figure out a better way.
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418 zx_handle_t vmo;
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419 zx_status_t status = _zx_vmo_create(size, 0, &vmo);
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420 if (status == ZX_OK) {
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421 while (size > 0) {
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422 size_t wrote;
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423 status = _zx_vmo_write(vmo, reinterpret_cast<const void *>(beg), 0, size,
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424 &wrote);
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425 if (status != ZX_OK) break;
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426 CHECK_GT(wrote, 0);
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427 CHECK_LE(wrote, size);
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428 beg += wrote;
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429 size -= wrote;
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430 }
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431 _zx_handle_close(vmo);
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432 }
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433 return status == ZX_OK;
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434 }
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435
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436 // FIXME implement on this platform.
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437 void GetMemoryProfile(fill_profile_f cb, uptr *stats, uptr stats_size) {}
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438
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439 bool ReadFileToBuffer(const char *file_name, char **buff, uptr *buff_size,
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440 uptr *read_len, uptr max_len, error_t *errno_p) {
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441 zx_handle_t vmo;
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442 zx_status_t status = __sanitizer_get_configuration(file_name, &vmo);
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443 if (status == ZX_OK) {
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444 uint64_t vmo_size;
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445 status = _zx_vmo_get_size(vmo, &vmo_size);
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446 if (status == ZX_OK) {
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447 if (vmo_size < max_len) max_len = vmo_size;
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448 size_t map_size = RoundUpTo(max_len, PAGE_SIZE);
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449 uintptr_t addr;
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450 status = _zx_vmar_map(_zx_vmar_root_self(), 0, vmo, 0, map_size,
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451 ZX_VM_FLAG_PERM_READ, &addr);
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452 if (status == ZX_OK) {
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453 *buff = reinterpret_cast<char *>(addr);
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454 *buff_size = map_size;
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455 *read_len = max_len;
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456 }
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457 }
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458 _zx_handle_close(vmo);
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459 }
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460 if (status != ZX_OK && errno_p) *errno_p = status;
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461 return status == ZX_OK;
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462 }
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463
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464 void RawWrite(const char *buffer) {
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465 __sanitizer_log_write(buffer, internal_strlen(buffer));
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466 }
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467
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468 void CatastrophicErrorWrite(const char *buffer, uptr length) {
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469 __sanitizer_log_write(buffer, length);
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470 }
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471
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472 char **StoredArgv;
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473 char **StoredEnviron;
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474
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475 char **GetArgv() { return StoredArgv; }
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476
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477 const char *GetEnv(const char *name) {
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478 if (StoredEnviron) {
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479 uptr NameLen = internal_strlen(name);
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480 for (char **Env = StoredEnviron; *Env != 0; Env++) {
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481 if (internal_strncmp(*Env, name, NameLen) == 0 && (*Env)[NameLen] == '=')
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482 return (*Env) + NameLen + 1;
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483 }
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484 }
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485 return nullptr;
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486 }
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487
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488 uptr ReadBinaryName(/*out*/ char *buf, uptr buf_len) {
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489 const char *argv0 = StoredArgv[0];
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490 if (!argv0) argv0 = "<UNKNOWN>";
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491 internal_strncpy(buf, argv0, buf_len);
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492 return internal_strlen(buf);
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493 }
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494
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495 uptr ReadLongProcessName(/*out*/ char *buf, uptr buf_len) {
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496 return ReadBinaryName(buf, buf_len);
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497 }
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498
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499 uptr MainThreadStackBase, MainThreadStackSize;
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500
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501 bool GetRandom(void *buffer, uptr length, bool blocking) {
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502 CHECK_LE(length, ZX_CPRNG_DRAW_MAX_LEN);
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503 size_t size;
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504 CHECK_EQ(_zx_cprng_draw(buffer, length, &size), ZX_OK);
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505 CHECK_EQ(size, length);
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506 return true;
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507 }
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508
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509 u32 GetNumberOfCPUs() {
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510 return zx_system_get_num_cpus();
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511 }
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512
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513 uptr GetRSS() { UNIMPLEMENTED(); }
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514
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515 } // namespace __sanitizer
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516
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517 using namespace __sanitizer; // NOLINT
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518
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519 extern "C" {
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520 void __sanitizer_startup_hook(int argc, char **argv, char **envp,
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521 void *stack_base, size_t stack_size) {
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522 __sanitizer::StoredArgv = argv;
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523 __sanitizer::StoredEnviron = envp;
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524 __sanitizer::MainThreadStackBase = reinterpret_cast<uintptr_t>(stack_base);
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525 __sanitizer::MainThreadStackSize = stack_size;
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526 }
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527
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528 void __sanitizer_set_report_path(const char *path) {
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529 // Handle the initialization code in each sanitizer, but no other calls.
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530 // This setting is never consulted on Fuchsia.
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531 DCHECK_EQ(path, common_flags()->log_path);
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532 }
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533
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534 void __sanitizer_set_report_fd(void *fd) {
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535 UNREACHABLE("not available on Fuchsia");
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536 }
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537 } // extern "C"
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538
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539 #endif // SANITIZER_FUCHSIA