compiler-rt/lib/sanitizer_common/sanitizer_fuchsia.cpp

   1 //===-- sanitizer_fuchsia.cpp ---------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file is shared between AddressSanitizer and other sanitizer
  10 // run-time libraries and implements Fuchsia-specific functions from
  11 // sanitizer_common.h.
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "sanitizer_fuchsia.h"
  15 #if SANITIZER_FUCHSIA
  16
  17 #  include <pthread.h>
  18 #  include <stdlib.h>
  19 #  include <unistd.h>
  20 #  include <zircon/errors.h>
  21 #  include <zircon/process.h>
  22 #  include <zircon/syscalls.h>
  23 #  include <zircon/utc.h>
  24
  25 #  include "sanitizer_common.h"
  26 #  include "sanitizer_interface_internal.h"
  27 #  include "sanitizer_libc.h"
  28 #  include "sanitizer_mutex.h"
  29
  30 namespace __sanitizer {
  31
  32 void NORETURN internal__exit(int exitcode) { _zx_process_exit(exitcode); }
  33
  34 uptr internal_sched_yield() {
  35   zx_status_t status = _zx_thread_legacy_yield(0u);
  36   CHECK_EQ(status, ZX_OK);
  37   return 0;  // Why doesn't this return void?
  38 }
  39
  40 void internal_usleep(u64 useconds) {
  41   zx_status_t status = _zx_nanosleep(_zx_deadline_after(ZX_USEC(useconds)));
  42   CHECK_EQ(status, ZX_OK);
  43 }
  44
  45 u64 NanoTime() {
  46   zx_handle_t utc_clock = _zx_utc_reference_get();
  47   CHECK_NE(utc_clock, ZX_HANDLE_INVALID);
  48   zx_time_t time;
  49   zx_status_t status = _zx_clock_read(utc_clock, &time);
  50   CHECK_EQ(status, ZX_OK);
  51   return time;
  52 }
  53
  54 u64 MonotonicNanoTime() { return _zx_clock_get_monotonic(); }
  55
  56 uptr internal_getpid() {
  57   zx_info_handle_basic_t info;
  58   zx_status_t status =
  59       _zx_object_get_info(_zx_process_self(), ZX_INFO_HANDLE_BASIC, &info,
  60                           sizeof(info), NULL, NULL);
  61   CHECK_EQ(status, ZX_OK);
  62   uptr pid = static_cast<uptr>(info.koid);
  63   CHECK_EQ(pid, info.koid);
  64   return pid;
  65 }
  66
  67 int internal_dlinfo(void *handle, int request, void *p) { UNIMPLEMENTED(); }
  68
  69 uptr GetThreadSelf() { return reinterpret_cast<uptr>(thrd_current()); }
  70
  71 tid_t GetTid() { return GetThreadSelf(); }
  72
  73 void Abort() { abort(); }
  74
  75 int Atexit(void (*function)(void)) { return atexit(function); }
  76
  77 void GetThreadStackTopAndBottom(bool, uptr *stack_top, uptr *stack_bottom) {
  78   pthread_attr_t attr;
  79   CHECK_EQ(pthread_getattr_np(pthread_self(), &attr), 0);
  80   void *base;
  81   size_t size;
  82   CHECK_EQ(pthread_attr_getstack(&attr, &base, &size), 0);
  83   CHECK_EQ(pthread_attr_destroy(&attr), 0);
  84
  85   *stack_bottom = reinterpret_cast<uptr>(base);
  86   *stack_top = *stack_bottom + size;
  87 }
  88
  89 void InitializePlatformEarly() {}
  90 void CheckASLR() {}
  91 void CheckMPROTECT() {}
  92 void PlatformPrepareForSandboxing(void *args) {}
  93 void DisableCoreDumperIfNecessary() {}
  94 void InstallDeadlySignalHandlers(SignalHandlerType handler) {}
  95 void SetAlternateSignalStack() {}
  96 void UnsetAlternateSignalStack() {}
  97
  98 bool SignalContext::IsStackOverflow() const { return false; }
  99 void SignalContext::DumpAllRegisters(void *context) { UNIMPLEMENTED(); }
 100 const char *SignalContext::Describe() const { UNIMPLEMENTED(); }
 101
 102 void FutexWait(atomic_uint32_t *p, u32 cmp) {
 103   zx_status_t status = _zx_futex_wait(reinterpret_cast<zx_futex_t *>(p), cmp,
 104                                       ZX_HANDLE_INVALID, ZX_TIME_INFINITE);
 105   if (status != ZX_ERR_BAD_STATE)  // Normal race.
 106     CHECK_EQ(status, ZX_OK);
 107 }
 108
 109 void FutexWake(atomic_uint32_t *p, u32 count) {
 110   zx_status_t status = _zx_futex_wake(reinterpret_cast<zx_futex_t *>(p), count);
 111   CHECK_EQ(status, ZX_OK);
 112 }
 113
 114 uptr GetPageSize() { return _zx_system_get_page_size(); }
 115
 116 uptr GetMmapGranularity() { return _zx_system_get_page_size(); }
 117
 118 sanitizer_shadow_bounds_t ShadowBounds;
 119
 120 void InitShadowBounds() { ShadowBounds = __sanitizer_shadow_bounds(); }
 121
 122 uptr GetMaxUserVirtualAddress() {
 123   InitShadowBounds();
 124   return ShadowBounds.memory_limit - 1;
 125 }
 126
 127 uptr GetMaxVirtualAddress() { return GetMaxUserVirtualAddress(); }
 128
 129 bool ErrorIsOOM(error_t err) { return err == ZX_ERR_NO_MEMORY; }
 130
 131 // For any sanitizer internal that needs to map something which can be unmapped
 132 // later, first attempt to map to a pre-allocated VMAR. This helps reduce
 133 // fragmentation from many small anonymous mmap calls. A good value for this
 134 // VMAR size would be the total size of your typical sanitizer internal objects
 135 // allocated in an "average" process lifetime. Examples of this include:
 136 // FakeStack, LowLevelAllocator mappings, TwoLevelMap, InternalMmapVector,
 137 // StackStore, CreateAsanThread, etc.
 138 //
 139 // This is roughly equal to the total sum of sanitizer internal mappings for a
 140 // large test case.
 141 constexpr size_t kSanitizerHeapVmarSize = 13ULL << 20;
 142 static zx_handle_t gSanitizerHeapVmar = ZX_HANDLE_INVALID;
 143
 144 static zx_status_t GetSanitizerHeapVmar(zx_handle_t *vmar) {
 145   zx_status_t status = ZX_OK;
 146   if (gSanitizerHeapVmar == ZX_HANDLE_INVALID) {
 147     CHECK_EQ(kSanitizerHeapVmarSize % GetPageSizeCached(), 0);
 148     uintptr_t base;
 149     status = _zx_vmar_allocate(
 150         _zx_vmar_root_self(),
 151         ZX_VM_CAN_MAP_READ | ZX_VM_CAN_MAP_WRITE | ZX_VM_CAN_MAP_SPECIFIC, 0,
 152         kSanitizerHeapVmarSize, &gSanitizerHeapVmar, &base);
 153   }
 154   *vmar = gSanitizerHeapVmar;
 155   if (status == ZX_OK)
 156     CHECK_NE(gSanitizerHeapVmar, ZX_HANDLE_INVALID);
 157   return status;
 158 }
 159
 160 static zx_status_t TryVmoMapSanitizerVmar(zx_vm_option_t options,
 161                                           size_t vmar_offset, zx_handle_t vmo,
 162                                           size_t size, uintptr_t *addr,
 163                                           zx_handle_t *vmar_used = nullptr) {
 164   zx_handle_t vmar;
 165   zx_status_t status = GetSanitizerHeapVmar(&vmar);
 166   if (status != ZX_OK)
 167     return status;
 168
 169   status = _zx_vmar_map(gSanitizerHeapVmar, options, vmar_offset, vmo,
 170                         /*vmo_offset=*/0, size, addr);
 171   if (vmar_used)
 172     *vmar_used = gSanitizerHeapVmar;
 173   if (status == ZX_ERR_NO_RESOURCES || status == ZX_ERR_INVALID_ARGS) {
 174     // This means there's no space in the heap VMAR, so fallback to the root
 175     // VMAR.
 176     status = _zx_vmar_map(_zx_vmar_root_self(), options, vmar_offset, vmo,
 177                           /*vmo_offset=*/0, size, addr);
 178     if (vmar_used)
 179       *vmar_used = _zx_vmar_root_self();
 180   }
 181
 182   return status;
 183 }
 184
 185 static void *DoAnonymousMmapOrDie(uptr size, const char *mem_type,
 186                                   bool raw_report, bool die_for_nomem) {
 187   size = RoundUpTo(size, GetPageSize());
 188
 189   zx_handle_t vmo;
 190   zx_status_t status = _zx_vmo_create(size, 0, &vmo);
 191   if (status != ZX_OK) {
 192     if (status != ZX_ERR_NO_MEMORY || die_for_nomem)
 193       ReportMmapFailureAndDie(size, mem_type, "zx_vmo_create", status,
 194                               raw_report);
 195     return nullptr;
 196   }
 197   _zx_object_set_property(vmo, ZX_PROP_NAME, mem_type,
 198                           internal_strlen(mem_type));
 199
 200   uintptr_t addr;
 201   status = TryVmoMapSanitizerVmar(ZX_VM_PERM_READ | ZX_VM_PERM_WRITE,
 202                                   /*vmar_offset=*/0, vmo, size, &addr);
 203   _zx_handle_close(vmo);
 204
 205   if (status != ZX_OK) {
 206     if (status != ZX_ERR_NO_MEMORY || die_for_nomem)
 207       ReportMmapFailureAndDie(size, mem_type, "zx_vmar_map", status,
 208                               raw_report);
 209     return nullptr;
 210   }
 211
 212   IncreaseTotalMmap(size);
 213
 214   return reinterpret_cast<void *>(addr);
 215 }
 216
 217 void *MmapOrDie(uptr size, const char *mem_type, bool raw_report) {
 218   return DoAnonymousMmapOrDie(size, mem_type, raw_report, true);
 219 }
 220
 221 void *MmapNoReserveOrDie(uptr size, const char *mem_type) {
 222   return MmapOrDie(size, mem_type);
 223 }
 224
 225 void *MmapOrDieOnFatalError(uptr size, const char *mem_type) {
 226   return DoAnonymousMmapOrDie(size, mem_type, false, false);
 227 }
 228
 229 uptr ReservedAddressRange::Init(uptr init_size, const char *name,
 230                                 uptr fixed_addr) {
 231   init_size = RoundUpTo(init_size, GetPageSize());
 232   DCHECK_EQ(os_handle_, ZX_HANDLE_INVALID);
 233   uintptr_t base;
 234   zx_handle_t vmar;
 235   zx_status_t status = _zx_vmar_allocate(
 236       _zx_vmar_root_self(),
 237       ZX_VM_CAN_MAP_READ | ZX_VM_CAN_MAP_WRITE | ZX_VM_CAN_MAP_SPECIFIC, 0,
 238       init_size, &vmar, &base);
 239   if (status != ZX_OK)
 240     ReportMmapFailureAndDie(init_size, name, "zx_vmar_allocate", status);
 241   base_ = reinterpret_cast<void *>(base);
 242   size_ = init_size;
 243   name_ = name;
 244   os_handle_ = vmar;
 245
 246   return reinterpret_cast<uptr>(base_);
 247 }
 248
 249 static uptr DoMmapFixedOrDie(zx_handle_t vmar, uptr fixed_addr, uptr map_size,
 250                              void *base, const char *name, bool die_for_nomem) {
 251   uptr offset = fixed_addr - reinterpret_cast<uptr>(base);
 252   map_size = RoundUpTo(map_size, GetPageSize());
 253   zx_handle_t vmo;
 254   zx_status_t status = _zx_vmo_create(map_size, 0, &vmo);
 255   if (status != ZX_OK) {
 256     if (status != ZX_ERR_NO_MEMORY || die_for_nomem)
 257       ReportMmapFailureAndDie(map_size, name, "zx_vmo_create", status);
 258     return 0;
 259   }
 260   _zx_object_set_property(vmo, ZX_PROP_NAME, name, internal_strlen(name));
 261   DCHECK_GE(base + size_, map_size + offset);
 262   uintptr_t addr;
 263
 264   status =
 265       _zx_vmar_map(vmar, ZX_VM_PERM_READ | ZX_VM_PERM_WRITE | ZX_VM_SPECIFIC,
 266                    offset, vmo, 0, map_size, &addr);
 267   _zx_handle_close(vmo);
 268   if (status != ZX_OK) {
 269     if (status != ZX_ERR_NO_MEMORY || die_for_nomem) {
 270       ReportMmapFailureAndDie(map_size, name, "zx_vmar_map", status);
 271     }
 272     return 0;
 273   }
 274   IncreaseTotalMmap(map_size);
 275   return addr;
 276 }
 277
 278 uptr ReservedAddressRange::Map(uptr fixed_addr, uptr map_size,
 279                                const char *name) {
 280   return DoMmapFixedOrDie(os_handle_, fixed_addr, map_size, base_,
 281                           name ? name : name_, false);
 282 }
 283
 284 uptr ReservedAddressRange::MapOrDie(uptr fixed_addr, uptr map_size,
 285                                     const char *name) {
 286   return DoMmapFixedOrDie(os_handle_, fixed_addr, map_size, base_,
 287                           name ? name : name_, true);
 288 }
 289
 290 void UnmapOrDieVmar(void *addr, uptr size, zx_handle_t target_vmar,
 291                     bool raw_report) {
 292   if (!addr || !size)
 293     return;
 294   size = RoundUpTo(size, GetPageSize());
 295
 296   zx_status_t status =
 297       _zx_vmar_unmap(target_vmar, reinterpret_cast<uintptr_t>(addr), size);
 298   if (status == ZX_ERR_INVALID_ARGS && target_vmar == gSanitizerHeapVmar) {
 299     // If there wasn't any space in the heap vmar, the fallback was the root
 300     // vmar.
 301     status = _zx_vmar_unmap(_zx_vmar_root_self(),
 302                             reinterpret_cast<uintptr_t>(addr), size);
 303   }
 304   if (status != ZX_OK)
 305     ReportMunmapFailureAndDie(addr, size, status, raw_report);
 306
 307   DecreaseTotalMmap(size);
 308 }
 309
 310 void ReservedAddressRange::Unmap(uptr addr, uptr size) {
 311   CHECK_LE(size, size_);
 312   const zx_handle_t vmar = static_cast<zx_handle_t>(os_handle_);
 313   if (addr == reinterpret_cast<uptr>(base_)) {
 314     if (size == size_) {
 315       // Destroying the vmar effectively unmaps the whole mapping.
 316       _zx_vmar_destroy(vmar);
 317       _zx_handle_close(vmar);
 318       os_handle_ = static_cast<uptr>(ZX_HANDLE_INVALID);
 319       DecreaseTotalMmap(size);
 320       return;
 321     }
 322   } else {
 323     CHECK_EQ(addr + size, reinterpret_cast<uptr>(base_) + size_);
 324   }
 325   // Partial unmapping does not affect the fact that the initial range is still
 326   // reserved, and the resulting unmapped memory can't be reused.
 327   UnmapOrDieVmar(reinterpret_cast<void *>(addr), size, vmar,
 328                  /*raw_report=*/false);
 329 }
 330
 331 // This should never be called.
 332 void *MmapFixedNoAccess(uptr fixed_addr, uptr size, const char *name) {
 333   UNIMPLEMENTED();
 334 }
 335
 336 bool MprotectNoAccess(uptr addr, uptr size) {
 337   return _zx_vmar_protect(_zx_vmar_root_self(), 0, addr, size) == ZX_OK;
 338 }
 339
 340 bool MprotectReadOnly(uptr addr, uptr size) {
 341   return _zx_vmar_protect(_zx_vmar_root_self(), ZX_VM_PERM_READ, addr, size) ==
 342          ZX_OK;
 343 }
 344
 345 bool MprotectReadWrite(uptr addr, uptr size) {
 346   return _zx_vmar_protect(_zx_vmar_root_self(),
 347                           ZX_VM_PERM_READ | ZX_VM_PERM_WRITE, addr,
 348                           size) == ZX_OK;
 349 }
 350
 351 void *MmapAlignedOrDieOnFatalError(uptr size, uptr alignment,
 352                                    const char *mem_type) {
 353   CHECK_GE(size, GetPageSize());
 354   CHECK(IsPowerOfTwo(size));
 355   CHECK(IsPowerOfTwo(alignment));
 356
 357   zx_handle_t vmo;
 358   zx_status_t status = _zx_vmo_create(size, 0, &vmo);
 359   if (status != ZX_OK) {
 360     if (status != ZX_ERR_NO_MEMORY)
 361       ReportMmapFailureAndDie(size, mem_type, "zx_vmo_create", status, false);
 362     return nullptr;
 363   }
 364   _zx_object_set_property(vmo, ZX_PROP_NAME, mem_type,
 365                           internal_strlen(mem_type));
 366
 367   // Map a larger size to get a chunk of address space big enough that
 368   // it surely contains an aligned region of the requested size.  Then
 369   // overwrite the aligned middle portion with a mapping from the
 370   // beginning of the VMO, and unmap the excess before and after.
 371   size_t map_size = size + alignment;
 372   uintptr_t addr;
 373   zx_handle_t vmar_used;
 374   status = TryVmoMapSanitizerVmar(ZX_VM_PERM_READ | ZX_VM_PERM_WRITE,
 375                                   /*vmar_offset=*/0, vmo, map_size, &addr,
 376                                   &vmar_used);
 377   if (status == ZX_OK) {
 378     uintptr_t map_addr = addr;
 379     uintptr_t map_end = map_addr + map_size;
 380     addr = RoundUpTo(map_addr, alignment);
 381     uintptr_t end = addr + size;
 382     if (addr != map_addr) {
 383       zx_info_vmar_t info;
 384       status = _zx_object_get_info(vmar_used, ZX_INFO_VMAR, &info, sizeof(info),
 385                                    NULL, NULL);
 386       if (status == ZX_OK) {
 387         uintptr_t new_addr;
 388         status = _zx_vmar_map(
 389             vmar_used,
 390             ZX_VM_PERM_READ | ZX_VM_PERM_WRITE | ZX_VM_SPECIFIC_OVERWRITE,
 391             addr - info.base, vmo, 0, size, &new_addr);
 392         if (status == ZX_OK)
 393           CHECK_EQ(new_addr, addr);
 394       }
 395     }
 396     if (status == ZX_OK && addr != map_addr)
 397       status = _zx_vmar_unmap(vmar_used, map_addr, addr - map_addr);
 398     if (status == ZX_OK && end != map_end)
 399       status = _zx_vmar_unmap(vmar_used, end, map_end - end);
 400   }
 401   _zx_handle_close(vmo);
 402
 403   if (status != ZX_OK) {
 404     if (status != ZX_ERR_NO_MEMORY)
 405       ReportMmapFailureAndDie(size, mem_type, "zx_vmar_map", status, false);
 406     return nullptr;
 407   }
 408
 409   IncreaseTotalMmap(size);
 410
 411   return reinterpret_cast<void *>(addr);
 412 }
 413
 414 void UnmapOrDie(void *addr, uptr size, bool raw_report) {
 415   UnmapOrDieVmar(addr, size, gSanitizerHeapVmar, raw_report);
 416 }
 417
 418 void ReleaseMemoryPagesToOS(uptr beg, uptr end) {
 419   uptr beg_aligned = RoundUpTo(beg, GetPageSize());
 420   uptr end_aligned = RoundDownTo(end, GetPageSize());
 421   if (beg_aligned < end_aligned) {
 422     zx_handle_t root_vmar = _zx_vmar_root_self();
 423     CHECK_NE(root_vmar, ZX_HANDLE_INVALID);
 424     zx_status_t status =
 425         _zx_vmar_op_range(root_vmar, ZX_VMAR_OP_DECOMMIT, beg_aligned,
 426                           end_aligned - beg_aligned, nullptr, 0);
 427     CHECK_EQ(status, ZX_OK);
 428   }
 429 }
 430
 431 void DumpProcessMap() {
 432   // TODO(mcgrathr): write it
 433   return;
 434 }
 435
 436 bool IsAccessibleMemoryRange(uptr beg, uptr size) {
 437   // TODO(mcgrathr): Figure out a better way.
 438   zx_handle_t vmo;
 439   zx_status_t status = _zx_vmo_create(size, 0, &vmo);
 440   if (status == ZX_OK) {
 441     status = _zx_vmo_write(vmo, reinterpret_cast<const void *>(beg), 0, size);
 442     _zx_handle_close(vmo);
 443   }
 444   return status == ZX_OK;
 445 }
 446
 447 bool TryMemCpy(void *dest, const void *src, uptr n) {
 448   // TODO: implement.
 449   return false;
 450 }
 451
 452 // FIXME implement on this platform.
 453 void GetMemoryProfile(fill_profile_f cb, uptr *stats) {}
 454
 455 bool ReadFileToBuffer(const char *file_name, char **buff, uptr *buff_size,
 456                       uptr *read_len, uptr max_len, error_t *errno_p) {
 457   *errno_p = ZX_ERR_NOT_SUPPORTED;
 458   return false;
 459 }
 460
 461 void RawWrite(const char *buffer) {
 462   constexpr size_t size = 128;
 463   static _Thread_local char line[size];
 464   static _Thread_local size_t lastLineEnd = 0;
 465   static _Thread_local size_t cur = 0;
 466
 467   while (*buffer) {
 468     if (cur >= size) {
 469       if (lastLineEnd == 0)
 470         lastLineEnd = size;
 471       __sanitizer_log_write(line, lastLineEnd);
 472       internal_memmove(line, line + lastLineEnd, cur - lastLineEnd);
 473       cur = cur - lastLineEnd;
 474       lastLineEnd = 0;
 475     }
 476     if (*buffer == '\n')
 477       lastLineEnd = cur + 1;
 478     line[cur++] = *buffer++;
 479   }
 480   // Flush all complete lines before returning.
 481   if (lastLineEnd != 0) {
 482     __sanitizer_log_write(line, lastLineEnd);
 483     internal_memmove(line, line + lastLineEnd, cur - lastLineEnd);
 484     cur = cur - lastLineEnd;
 485     lastLineEnd = 0;
 486   }
 487 }
 488
 489 void CatastrophicErrorWrite(const char *buffer, uptr length) {
 490   __sanitizer_log_write(buffer, length);
 491 }
 492
 493 char **StoredArgv;
 494 char **StoredEnviron;
 495
 496 char **GetArgv() { return StoredArgv; }
 497 char **GetEnviron() { return StoredEnviron; }
 498
 499 const char *GetEnv(const char *name) {
 500   if (StoredEnviron) {
 501     uptr NameLen = internal_strlen(name);
 502     for (char **Env = StoredEnviron; *Env != 0; Env++) {
 503       if (internal_strncmp(*Env, name, NameLen) == 0 && (*Env)[NameLen] == '=')
 504         return (*Env) + NameLen + 1;
 505     }
 506   }
 507   return nullptr;
 508 }
 509
 510 uptr ReadBinaryName(/*out*/ char *buf, uptr buf_len) {
 511   const char *argv0 = "<UNKNOWN>";
 512   if (StoredArgv && StoredArgv[0]) {
 513     argv0 = StoredArgv[0];
 514   }
 515   internal_strncpy(buf, argv0, buf_len);
 516   return internal_strlen(buf);
 517 }
 518
 519 uptr ReadLongProcessName(/*out*/ char *buf, uptr buf_len) {
 520   return ReadBinaryName(buf, buf_len);
 521 }
 522
 523 uptr MainThreadStackBase, MainThreadStackSize;
 524
 525 bool GetRandom(void *buffer, uptr length, bool blocking) {
 526   _zx_cprng_draw(buffer, length);
 527   return true;
 528 }
 529
 530 u32 GetNumberOfCPUs() { return zx_system_get_num_cpus(); }
 531
 532 uptr GetRSS() { UNIMPLEMENTED(); }
 533
 534 void *internal_start_thread(void *(*func)(void *arg), void *arg) { return 0; }
 535 void internal_join_thread(void *th) {}
 536
 537 void InitializePlatformCommonFlags(CommonFlags *cf) {}
 538
 539 }  // namespace __sanitizer
 540
 541 using namespace __sanitizer;
 542
 543 extern "C" {
 544 void __sanitizer_startup_hook(int argc, char **argv, char **envp,
 545                               void *stack_base, size_t stack_size) {
 546   __sanitizer::StoredArgv = argv;
 547   __sanitizer::StoredEnviron = envp;
 548   __sanitizer::MainThreadStackBase = reinterpret_cast<uintptr_t>(stack_base);
 549   __sanitizer::MainThreadStackSize = stack_size;
 550 }
 551
 552 void __sanitizer_set_report_path(const char *path) {
 553   // Handle the initialization code in each sanitizer, but no other calls.
 554   // This setting is never consulted on Fuchsia.
 555   DCHECK_EQ(path, common_flags()->log_path);
 556 }
 557
 558 void __sanitizer_set_report_fd(void *fd) {
 559   UNREACHABLE("not available on Fuchsia");
 560 }
 561
 562 const char *__sanitizer_get_report_path() {
 563   UNREACHABLE("not available on Fuchsia");
 564 }
 565 }  // extern "C"
 566
 567 #endif  // SANITIZER_FUCHSIA