src/compiler-rt/lib/sanitizer_common/sanitizer_common.cc

   1 //===-- sanitizer_common.cc -----------------------------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file is shared between AddressSanitizer and ThreadSanitizer
  11 // run-time libraries.
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "sanitizer_common.h"
  15 #include "sanitizer_allocator_interface.h"
  16 #include "sanitizer_allocator_internal.h"
  17 #include "sanitizer_flags.h"
  18 #include "sanitizer_libc.h"
  19 #include "sanitizer_placement_new.h"
  20 #include "sanitizer_stacktrace_printer.h"
  21 #include "sanitizer_symbolizer.h"
  22
  23 namespace __sanitizer {
  24
  25 const char *SanitizerToolName = "SanitizerTool";
  26
  27 atomic_uint32_t current_verbosity;
  28 uptr PageSizeCached;
  29
  30 StaticSpinMutex report_file_mu;
  31 ReportFile report_file = {&report_file_mu, kStderrFd, "", "", 0};
  32
  33 void RawWrite(const char *buffer) {
  34   report_file.Write(buffer, internal_strlen(buffer));
  35 }
  36
  37 void ReportFile::ReopenIfNecessary() {
  38   mu->CheckLocked();
  39   if (fd == kStdoutFd || fd == kStderrFd) return;
  40
  41   uptr pid = internal_getpid();
  42   // If in tracer, use the parent's file.
  43   if (pid == stoptheworld_tracer_pid)
  44     pid = stoptheworld_tracer_ppid;
  45   if (fd != kInvalidFd) {
  46     // If the report file is already opened by the current process,
  47     // do nothing. Otherwise the report file was opened by the parent
  48     // process, close it now.
  49     if (fd_pid == pid)
  50       return;
  51     else
  52       CloseFile(fd);
  53   }
  54
  55   const char *exe_name = GetProcessName();
  56   if (common_flags()->log_exe_name && exe_name) {
  57     internal_snprintf(full_path, kMaxPathLength, "%s.%s.%zu", path_prefix,
  58                       exe_name, pid);
  59   } else {
  60     internal_snprintf(full_path, kMaxPathLength, "%s.%zu", path_prefix, pid);
  61   }
  62   fd = OpenFile(full_path, WrOnly);
  63   if (fd == kInvalidFd) {
  64     const char *ErrorMsgPrefix = "ERROR: Can't open file: ";
  65     WriteToFile(kStderrFd, ErrorMsgPrefix, internal_strlen(ErrorMsgPrefix));
  66     WriteToFile(kStderrFd, full_path, internal_strlen(full_path));
  67     Die();
  68   }
  69   fd_pid = pid;
  70 }
  71
  72 void ReportFile::SetReportPath(const char *path) {
  73   if (!path)
  74     return;
  75   uptr len = internal_strlen(path);
  76   if (len > sizeof(path_prefix) - 100) {
  77     Report("ERROR: Path is too long: %c%c%c%c%c%c%c%c...\n",
  78            path[0], path[1], path[2], path[3],
  79            path[4], path[5], path[6], path[7]);
  80     Die();
  81   }
  82
  83   SpinMutexLock l(mu);
  84   if (fd != kStdoutFd && fd != kStderrFd && fd != kInvalidFd)
  85     CloseFile(fd);
  86   fd = kInvalidFd;
  87   if (internal_strcmp(path, "stdout") == 0) {
  88     fd = kStdoutFd;
  89   } else if (internal_strcmp(path, "stderr") == 0) {
  90     fd = kStderrFd;
  91   } else {
  92     internal_snprintf(path_prefix, kMaxPathLength, "%s", path);
  93   }
  94 }
  95
  96 // PID of the tracer task in StopTheWorld. It shares the address space with the
  97 // main process, but has a different PID and thus requires special handling.
  98 uptr stoptheworld_tracer_pid = 0;
  99 // Cached pid of parent process - if the parent process dies, we want to keep
 100 // writing to the same log file.
 101 uptr stoptheworld_tracer_ppid = 0;
 102
 103 void NORETURN ReportMmapFailureAndDie(uptr size, const char *mem_type,
 104                                       const char *mmap_type, error_t err,
 105                                       bool raw_report) {
 106   static int recursion_count;
 107   if (raw_report || recursion_count) {
 108     // If raw report is requested or we went into recursion, just die.
 109     // The Report() and CHECK calls below may call mmap recursively and fail.
 110     RawWrite("ERROR: Failed to mmap\n");
 111     Die();
 112   }
 113   recursion_count++;
 114   Report("ERROR: %s failed to "
 115          "%s 0x%zx (%zd) bytes of %s (error code: %d)\n",
 116          SanitizerToolName, mmap_type, size, size, mem_type, err);
 117 #ifndef SANITIZER_GO
 118   DumpProcessMap();
 119 #endif
 120   UNREACHABLE("unable to mmap");
 121 }
 122
 123 bool ReadFileToBuffer(const char *file_name, char **buff, uptr *buff_size,
 124                       uptr *read_len, uptr max_len, error_t *errno_p) {
 125   uptr PageSize = GetPageSizeCached();
 126   uptr kMinFileLen = PageSize;
 127   *buff = nullptr;
 128   *buff_size = 0;
 129   *read_len = 0;
 130   // The files we usually open are not seekable, so try different buffer sizes.
 131   for (uptr size = kMinFileLen; size <= max_len; size *= 2) {
 132     fd_t fd = OpenFile(file_name, RdOnly, errno_p);
 133     if (fd == kInvalidFd) return false;
 134     UnmapOrDie(*buff, *buff_size);
 135     *buff = (char*)MmapOrDie(size, __func__);
 136     *buff_size = size;
 137     *read_len = 0;
 138     // Read up to one page at a time.
 139     bool reached_eof = false;
 140     while (*read_len + PageSize <= size) {
 141       uptr just_read;
 142       if (!ReadFromFile(fd, *buff + *read_len, PageSize, &just_read, errno_p)) {
 143         UnmapOrDie(*buff, *buff_size);
 144         return false;
 145       }
 146       if (just_read == 0) {
 147         reached_eof = true;
 148         break;
 149       }
 150       *read_len += just_read;
 151     }
 152     CloseFile(fd);
 153     if (reached_eof)  // We've read the whole file.
 154       break;
 155   }
 156   return true;
 157 }
 158
 159 typedef bool UptrComparisonFunction(const uptr &a, const uptr &b);
 160
 161 template<class T>
 162 static inline bool CompareLess(const T &a, const T &b) {
 163   return a < b;
 164 }
 165
 166 void SortArray(uptr *array, uptr size) {
 167   InternalSort<uptr*, UptrComparisonFunction>(&array, size, CompareLess);
 168 }
 169
 170 const char *StripPathPrefix(const char *filepath,
 171                             const char *strip_path_prefix) {
 172   if (!filepath) return nullptr;
 173   if (!strip_path_prefix) return filepath;
 174   const char *res = filepath;
 175   if (const char *pos = internal_strstr(filepath, strip_path_prefix))
 176     res = pos + internal_strlen(strip_path_prefix);
 177   if (res[0] == '.' && res[1] == '/')
 178     res += 2;
 179   return res;
 180 }
 181
 182 const char *StripModuleName(const char *module) {
 183   if (!module)
 184     return nullptr;
 185   if (SANITIZER_WINDOWS) {
 186     // On Windows, both slash and backslash are possible.
 187     // Pick the one that goes last.
 188     if (const char *bslash_pos = internal_strrchr(module, '\\'))
 189       return StripModuleName(bslash_pos + 1);
 190   }
 191   if (const char *slash_pos = internal_strrchr(module, '/')) {
 192     return slash_pos + 1;
 193   }
 194   return module;
 195 }
 196
 197 void ReportErrorSummary(const char *error_message) {
 198   if (!common_flags()->print_summary)
 199     return;
 200   InternalScopedString buff(kMaxSummaryLength);
 201   buff.append("SUMMARY: %s: %s", SanitizerToolName, error_message);
 202   __sanitizer_report_error_summary(buff.data());
 203 }
 204
 205 #ifndef SANITIZER_GO
 206 void ReportErrorSummary(const char *error_type, const AddressInfo &info) {
 207   if (!common_flags()->print_summary)
 208     return;
 209   InternalScopedString buff(kMaxSummaryLength);
 210   buff.append("%s ", error_type);
 211   RenderFrame(&buff, "%L %F", 0, info, common_flags()->symbolize_vs_style,
 212               common_flags()->strip_path_prefix);
 213   ReportErrorSummary(buff.data());
 214 }
 215 #endif
 216
 217 // Removes the ANSI escape sequences from the input string (in-place).
 218 void RemoveANSIEscapeSequencesFromString(char *str) {
 219   if (!str)
 220     return;
 221
 222   // We are going to remove the escape sequences in place.
 223   char *s = str;
 224   char *z = str;
 225   while (*s != '\0') {
 226     CHECK_GE(s, z);
 227     // Skip over ANSI escape sequences with pointer 's'.
 228     if (*s == '\033' && *(s + 1) == '[') {
 229       s = internal_strchrnul(s, 'm');
 230       if (*s == '\0') {
 231         break;
 232       }
 233       s++;
 234       continue;
 235     }
 236     // 's' now points at a character we want to keep. Copy over the buffer
 237     // content if the escape sequence has been perviously skipped andadvance
 238     // both pointers.
 239     if (s != z)
 240       *z = *s;
 241
 242     // If we have not seen an escape sequence, just advance both pointers.
 243     z++;
 244     s++;
 245   }
 246
 247   // Null terminate the string.
 248   *z = '\0';
 249 }
 250
 251 void LoadedModule::set(const char *module_name, uptr base_address) {
 252   clear();
 253   full_name_ = internal_strdup(module_name);
 254   base_address_ = base_address;
 255 }
 256
 257 void LoadedModule::clear() {
 258   InternalFree(full_name_);
 259   full_name_ = nullptr;
 260   while (!ranges_.empty()) {
 261     AddressRange *r = ranges_.front();
 262     ranges_.pop_front();
 263     InternalFree(r);
 264   }
 265 }
 266
 267 void LoadedModule::addAddressRange(uptr beg, uptr end, bool executable) {
 268   void *mem = InternalAlloc(sizeof(AddressRange));
 269   AddressRange *r = new(mem) AddressRange(beg, end, executable);
 270   ranges_.push_back(r);
 271 }
 272
 273 bool LoadedModule::containsAddress(uptr address) const {
 274   for (const AddressRange &r : ranges()) {
 275     if (r.beg <= address && address < r.end)
 276       return true;
 277   }
 278   return false;
 279 }
 280
 281 static atomic_uintptr_t g_total_mmaped;
 282
 283 void IncreaseTotalMmap(uptr size) {
 284   if (!common_flags()->mmap_limit_mb) return;
 285   uptr total_mmaped =
 286       atomic_fetch_add(&g_total_mmaped, size, memory_order_relaxed) + size;
 287   // Since for now mmap_limit_mb is not a user-facing flag, just kill
 288   // a program. Use RAW_CHECK to avoid extra mmaps in reporting.
 289   RAW_CHECK((total_mmaped >> 20) < common_flags()->mmap_limit_mb);
 290 }
 291
 292 void DecreaseTotalMmap(uptr size) {
 293   if (!common_flags()->mmap_limit_mb) return;
 294   atomic_fetch_sub(&g_total_mmaped, size, memory_order_relaxed);
 295 }
 296
 297 bool TemplateMatch(const char *templ, const char *str) {
 298   if ((!str) || str[0] == 0)
 299     return false;
 300   bool start = false;
 301   if (templ && templ[0] == '^') {
 302     start = true;
 303     templ++;
 304   }
 305   bool asterisk = false;
 306   while (templ && templ[0]) {
 307     if (templ[0] == '*') {
 308       templ++;
 309       start = false;
 310       asterisk = true;
 311       continue;
 312     }
 313     if (templ[0] == '$')
 314       return str[0] == 0 || asterisk;
 315     if (str[0] == 0)
 316       return false;
 317     char *tpos = (char*)internal_strchr(templ, '*');
 318     char *tpos1 = (char*)internal_strchr(templ, '$');
 319     if ((!tpos) || (tpos1 && tpos1 < tpos))
 320       tpos = tpos1;
 321     if (tpos)
 322       tpos[0] = 0;
 323     const char *str0 = str;
 324     const char *spos = internal_strstr(str, templ);
 325     str = spos + internal_strlen(templ);
 326     templ = tpos;
 327     if (tpos)
 328       tpos[0] = tpos == tpos1 ? '$' : '*';
 329     if (!spos)
 330       return false;
 331     if (start && spos != str0)
 332       return false;
 333     start = false;
 334     asterisk = false;
 335   }
 336   return true;
 337 }
 338
 339 static const char kPathSeparator = SANITIZER_WINDOWS ? ';' : ':';
 340
 341 char *FindPathToBinary(const char *name) {
 342   if (FileExists(name)) {
 343     return internal_strdup(name);
 344   }
 345
 346   const char *path = GetEnv("PATH");
 347   if (!path)
 348     return nullptr;
 349   uptr name_len = internal_strlen(name);
 350   InternalScopedBuffer<char> buffer(kMaxPathLength);
 351   const char *beg = path;
 352   while (true) {
 353     const char *end = internal_strchrnul(beg, kPathSeparator);
 354     uptr prefix_len = end - beg;
 355     if (prefix_len + name_len + 2 <= kMaxPathLength) {
 356       internal_memcpy(buffer.data(), beg, prefix_len);
 357       buffer[prefix_len] = '/';
 358       internal_memcpy(&buffer[prefix_len + 1], name, name_len);
 359       buffer[prefix_len + 1 + name_len] = '\0';
 360       if (FileExists(buffer.data()))
 361         return internal_strdup(buffer.data());
 362     }
 363     if (*end == '\0') break;
 364     beg = end + 1;
 365   }
 366   return nullptr;
 367 }
 368
 369 static char binary_name_cache_str[kMaxPathLength];
 370 static char process_name_cache_str[kMaxPathLength];
 371
 372 const char *GetProcessName() {
 373   return process_name_cache_str;
 374 }
 375
 376 static uptr ReadProcessName(/*out*/ char *buf, uptr buf_len) {
 377   ReadLongProcessName(buf, buf_len);
 378   char *s = const_cast<char *>(StripModuleName(buf));
 379   uptr len = internal_strlen(s);
 380   if (s != buf) {
 381     internal_memmove(buf, s, len);
 382     buf[len] = '\0';
 383   }
 384   return len;
 385 }
 386
 387 void UpdateProcessName() {
 388   ReadProcessName(process_name_cache_str, sizeof(process_name_cache_str));
 389 }
 390
 391 // Call once to make sure that binary_name_cache_str is initialized
 392 void CacheBinaryName() {
 393   if (binary_name_cache_str[0] != '\0')
 394     return;
 395   ReadBinaryName(binary_name_cache_str, sizeof(binary_name_cache_str));
 396   ReadProcessName(process_name_cache_str, sizeof(process_name_cache_str));
 397 }
 398
 399 uptr ReadBinaryNameCached(/*out*/char *buf, uptr buf_len) {
 400   CacheBinaryName();
 401   uptr name_len = internal_strlen(binary_name_cache_str);
 402   name_len = (name_len < buf_len - 1) ? name_len : buf_len - 1;
 403   if (buf_len == 0)
 404     return 0;
 405   internal_memcpy(buf, binary_name_cache_str, name_len);
 406   buf[name_len] = '\0';
 407   return name_len;
 408 }
 409
 410 void PrintCmdline() {
 411   char **argv = GetArgv();
 412   if (!argv) return;
 413   Printf("\nCommand: ");
 414   for (uptr i = 0; argv[i]; ++i)
 415     Printf("%s ", argv[i]);
 416   Printf("\n\n");
 417 }
 418
 419 // Malloc hooks.
 420 static const int kMaxMallocFreeHooks = 5;
 421 struct MallocFreeHook {
 422   void (*malloc_hook)(const void *, uptr);
 423   void (*free_hook)(const void *);
 424 };
 425
 426 static MallocFreeHook MFHooks[kMaxMallocFreeHooks];
 427
 428 void RunMallocHooks(const void *ptr, uptr size) {
 429   for (int i = 0; i < kMaxMallocFreeHooks; i++) {
 430     auto hook = MFHooks[i].malloc_hook;
 431     if (!hook) return;
 432     hook(ptr, size);
 433   }
 434 }
 435
 436 void RunFreeHooks(const void *ptr) {
 437   for (int i = 0; i < kMaxMallocFreeHooks; i++) {
 438     auto hook = MFHooks[i].free_hook;
 439     if (!hook) return;
 440     hook(ptr);
 441   }
 442 }
 443
 444 static int InstallMallocFreeHooks(void (*malloc_hook)(const void *, uptr),
 445                                   void (*free_hook)(const void *)) {
 446   if (!malloc_hook || !free_hook) return 0;
 447   for (int i = 0; i < kMaxMallocFreeHooks; i++) {
 448     if (MFHooks[i].malloc_hook == nullptr) {
 449       MFHooks[i].malloc_hook = malloc_hook;
 450       MFHooks[i].free_hook = free_hook;
 451       return i + 1;
 452     }
 453   }
 454   return 0;
 455 }
 456
 457 } // namespace __sanitizer
 458
 459 using namespace __sanitizer;  // NOLINT
 460
 461 extern "C" {
 462 void __sanitizer_set_report_path(const char *path) {
 463   report_file.SetReportPath(path);
 464 }
 465
 466 void __sanitizer_set_report_fd(void *fd) {
 467   report_file.fd = (fd_t)reinterpret_cast<uptr>(fd);
 468   report_file.fd_pid = internal_getpid();
 469 }
 470
 471 void __sanitizer_report_error_summary(const char *error_summary) {
 472   Printf("%s\n", error_summary);
 473 }
 474
 475 SANITIZER_INTERFACE_ATTRIBUTE
 476 void __sanitizer_set_death_callback(void (*callback)(void)) {
 477   SetUserDieCallback(callback);
 478 }
 479
 480 SANITIZER_INTERFACE_ATTRIBUTE
 481 int __sanitizer_install_malloc_and_free_hooks(void (*malloc_hook)(const void *,
 482                                                                   uptr),
 483                                               void (*free_hook)(const void *)) {
 484   return InstallMallocFreeHooks(malloc_hook, free_hook);
 485 }
 486 } // extern "C"