libsanitizer/sanitizer_common/sanitizer_common.cpp

   1 //===-- sanitizer_common.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 ThreadSanitizer
  10 // run-time libraries.
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "sanitizer_common.h"
  14
  15 #include "sanitizer_allocator_interface.h"
  16 #include "sanitizer_allocator_internal.h"
  17 #include "sanitizer_atomic.h"
  18 #include "sanitizer_flags.h"
  19 #include "sanitizer_interface_internal.h"
  20 #include "sanitizer_libc.h"
  21 #include "sanitizer_placement_new.h"
  22
  23 namespace __sanitizer {
  24
  25 const char *SanitizerToolName = "SanitizerTool";
  26
  27 atomic_uint32_t current_verbosity;
  28 uptr PageSizeCached;
  29 u32 NumberOfCPUsCached;
  30
  31 // PID of the tracer task in StopTheWorld. It shares the address space with the
  32 // main process, but has a different PID and thus requires special handling.
  33 uptr stoptheworld_tracer_pid = 0;
  34 // Cached pid of parent process - if the parent process dies, we want to keep
  35 // writing to the same log file.
  36 uptr stoptheworld_tracer_ppid = 0;
  37
  38 void NORETURN ReportMmapFailureAndDie(uptr size, const char *mem_type,
  39                                       const char *mmap_type, error_t err,
  40                                       bool raw_report) {
  41   static int recursion_count;
  42   if (raw_report || recursion_count) {
  43     // If raw report is requested or we went into recursion just die.  The
  44     // Report() and CHECK calls below may call mmap recursively and fail.
  45     RawWrite("ERROR: Failed to mmap\n");
  46     Die();
  47   }
  48   recursion_count++;
  49   if (ErrorIsOOM(err)) {
  50     ERROR_OOM("failed to %s 0x%zx (%zd) bytes of %s (error code: %d)\n",
  51               mmap_type, size, size, mem_type, err);
  52   } else {
  53     Report(
  54         "ERROR: %s failed to "
  55         "%s 0x%zx (%zd) bytes of %s (error code: %d)\n",
  56         SanitizerToolName, mmap_type, size, size, mem_type, err);
  57   }
  58 #if !SANITIZER_GO
  59   DumpProcessMap();
  60 #endif
  61   UNREACHABLE("unable to mmap");
  62 }
  63
  64 void NORETURN ReportMunmapFailureAndDie(void *addr, uptr size, error_t err,
  65                                         bool raw_report) {
  66   static int recursion_count;
  67   if (raw_report || recursion_count) {
  68     // If raw report is requested or we went into recursion just die.  The
  69     // Report() and CHECK calls below may call munmap recursively and fail.
  70     RawWrite("ERROR: Failed to munmap\n");
  71     Die();
  72   }
  73   recursion_count++;
  74   Report(
  75       "ERROR: %s failed to deallocate 0x%zx (%zd) bytes at address %p (error "
  76       "code: %d)\n",
  77       SanitizerToolName, size, size, addr, err);
  78 #if !SANITIZER_GO
  79   DumpProcessMap();
  80 #endif
  81   UNREACHABLE("unable to unmmap");
  82 }
  83
  84 typedef bool UptrComparisonFunction(const uptr &a, const uptr &b);
  85 typedef bool U32ComparisonFunction(const u32 &a, const u32 &b);
  86
  87 const char *StripPathPrefix(const char *filepath,
  88                             const char *strip_path_prefix) {
  89   if (!filepath) return nullptr;
  90   if (!strip_path_prefix) return filepath;
  91   const char *res = filepath;
  92   if (const char *pos = internal_strstr(filepath, strip_path_prefix))
  93     res = pos + internal_strlen(strip_path_prefix);
  94   if (res[0] == '.' && res[1] == '/')
  95     res += 2;
  96   return res;
  97 }
  98
  99 const char *StripModuleName(const char *module) {
 100   if (!module)
 101     return nullptr;
 102   if (SANITIZER_WINDOWS) {
 103     // On Windows, both slash and backslash are possible.
 104     // Pick the one that goes last.
 105     if (const char *bslash_pos = internal_strrchr(module, '\\'))
 106       return StripModuleName(bslash_pos + 1);
 107   }
 108   if (const char *slash_pos = internal_strrchr(module, '/')) {
 109     return slash_pos + 1;
 110   }
 111   return module;
 112 }
 113
 114 void ReportErrorSummary(const char *error_message, const char *alt_tool_name) {
 115   if (!common_flags()->print_summary)
 116     return;
 117   InternalScopedString buff;
 118   buff.AppendF("SUMMARY: %s: %s",
 119                alt_tool_name ? alt_tool_name : SanitizerToolName,
 120                error_message);
 121   __sanitizer_report_error_summary(buff.data());
 122 }
 123
 124 // Removes the ANSI escape sequences from the input string (in-place).
 125 void RemoveANSIEscapeSequencesFromString(char *str) {
 126   if (!str)
 127     return;
 128
 129   // We are going to remove the escape sequences in place.
 130   char *s = str;
 131   char *z = str;
 132   while (*s != '\0') {
 133     CHECK_GE(s, z);
 134     // Skip over ANSI escape sequences with pointer 's'.
 135     if (*s == '\033' && *(s + 1) == '[') {
 136       s = internal_strchrnul(s, 'm');
 137       if (*s == '\0') {
 138         break;
 139       }
 140       s++;
 141       continue;
 142     }
 143     // 's' now points at a character we want to keep. Copy over the buffer
 144     // content if the escape sequence has been perviously skipped andadvance
 145     // both pointers.
 146     if (s != z)
 147       *z = *s;
 148
 149     // If we have not seen an escape sequence, just advance both pointers.
 150     z++;
 151     s++;
 152   }
 153
 154   // Null terminate the string.
 155   *z = '\0';
 156 }
 157
 158 void LoadedModule::set(const char *module_name, uptr base_address) {
 159   clear();
 160   full_name_ = internal_strdup(module_name);
 161   base_address_ = base_address;
 162 }
 163
 164 void LoadedModule::set(const char *module_name, uptr base_address,
 165                        ModuleArch arch, u8 uuid[kModuleUUIDSize],
 166                        bool instrumented) {
 167   set(module_name, base_address);
 168   arch_ = arch;
 169   internal_memcpy(uuid_, uuid, sizeof(uuid_));
 170   uuid_size_ = kModuleUUIDSize;
 171   instrumented_ = instrumented;
 172 }
 173
 174 void LoadedModule::setUuid(const char *uuid, uptr size) {
 175   if (size > kModuleUUIDSize)
 176     size = kModuleUUIDSize;
 177   internal_memcpy(uuid_, uuid, size);
 178   uuid_size_ = size;
 179 }
 180
 181 void LoadedModule::clear() {
 182   InternalFree(full_name_);
 183   base_address_ = 0;
 184   max_address_ = 0;
 185   full_name_ = nullptr;
 186   arch_ = kModuleArchUnknown;
 187   internal_memset(uuid_, 0, kModuleUUIDSize);
 188   instrumented_ = false;
 189   while (!ranges_.empty()) {
 190     AddressRange *r = ranges_.front();
 191     ranges_.pop_front();
 192     InternalFree(r);
 193   }
 194 }
 195
 196 void LoadedModule::addAddressRange(uptr beg, uptr end, bool executable,
 197                                    bool writable, const char *name) {
 198   void *mem = InternalAlloc(sizeof(AddressRange));
 199   AddressRange *r =
 200       new(mem) AddressRange(beg, end, executable, writable, name);
 201   ranges_.push_back(r);
 202   max_address_ = Max(max_address_, end);
 203 }
 204
 205 bool LoadedModule::containsAddress(uptr address) const {
 206   for (const AddressRange &r : ranges()) {
 207     if (r.beg <= address && address < r.end)
 208       return true;
 209   }
 210   return false;
 211 }
 212
 213 static atomic_uintptr_t g_total_mmaped;
 214
 215 void IncreaseTotalMmap(uptr size) {
 216   if (!common_flags()->mmap_limit_mb) return;
 217   uptr total_mmaped =
 218       atomic_fetch_add(&g_total_mmaped, size, memory_order_relaxed) + size;
 219   // Since for now mmap_limit_mb is not a user-facing flag, just kill
 220   // a program. Use RAW_CHECK to avoid extra mmaps in reporting.
 221   RAW_CHECK((total_mmaped >> 20) < common_flags()->mmap_limit_mb);
 222 }
 223
 224 void DecreaseTotalMmap(uptr size) {
 225   if (!common_flags()->mmap_limit_mb) return;
 226   atomic_fetch_sub(&g_total_mmaped, size, memory_order_relaxed);
 227 }
 228
 229 bool TemplateMatch(const char *templ, const char *str) {
 230   if ((!str) || str[0] == 0)
 231     return false;
 232   bool start = false;
 233   if (templ && templ[0] == '^') {
 234     start = true;
 235     templ++;
 236   }
 237   bool asterisk = false;
 238   while (templ && templ[0]) {
 239     if (templ[0] == '*') {
 240       templ++;
 241       start = false;
 242       asterisk = true;
 243       continue;
 244     }
 245     if (templ[0] == '$')
 246       return str[0] == 0 || asterisk;
 247     if (str[0] == 0)
 248       return false;
 249     char *tpos = (char*)internal_strchr(templ, '*');
 250     char *tpos1 = (char*)internal_strchr(templ, '$');
 251     if ((!tpos) || (tpos1 && tpos1 < tpos))
 252       tpos = tpos1;
 253     if (tpos)
 254       tpos[0] = 0;
 255     const char *str0 = str;
 256     const char *spos = internal_strstr(str, templ);
 257     str = spos + internal_strlen(templ);
 258     templ = tpos;
 259     if (tpos)
 260       tpos[0] = tpos == tpos1 ? '$' : '*';
 261     if (!spos)
 262       return false;
 263     if (start && spos != str0)
 264       return false;
 265     start = false;
 266     asterisk = false;
 267   }
 268   return true;
 269 }
 270
 271 static char binary_name_cache_str[kMaxPathLength];
 272 static char process_name_cache_str[kMaxPathLength];
 273
 274 const char *GetProcessName() {
 275   return process_name_cache_str;
 276 }
 277
 278 static uptr ReadProcessName(/*out*/ char *buf, uptr buf_len) {
 279   ReadLongProcessName(buf, buf_len);
 280   char *s = const_cast<char *>(StripModuleName(buf));
 281   uptr len = internal_strlen(s);
 282   if (s != buf) {
 283     internal_memmove(buf, s, len);
 284     buf[len] = '\0';
 285   }
 286   return len;
 287 }
 288
 289 void UpdateProcessName() {
 290   ReadProcessName(process_name_cache_str, sizeof(process_name_cache_str));
 291 }
 292
 293 // Call once to make sure that binary_name_cache_str is initialized
 294 void CacheBinaryName() {
 295   if (binary_name_cache_str[0] != '\0')
 296     return;
 297   ReadBinaryName(binary_name_cache_str, sizeof(binary_name_cache_str));
 298   ReadProcessName(process_name_cache_str, sizeof(process_name_cache_str));
 299 }
 300
 301 uptr ReadBinaryNameCached(/*out*/char *buf, uptr buf_len) {
 302   CacheBinaryName();
 303   uptr name_len = internal_strlen(binary_name_cache_str);
 304   name_len = (name_len < buf_len - 1) ? name_len : buf_len - 1;
 305   if (buf_len == 0)
 306     return 0;
 307   internal_memcpy(buf, binary_name_cache_str, name_len);
 308   buf[name_len] = '\0';
 309   return name_len;
 310 }
 311
 312 uptr ReadBinaryDir(/*out*/ char *buf, uptr buf_len) {
 313   ReadBinaryNameCached(buf, buf_len);
 314   const char *exec_name_pos = StripModuleName(buf);
 315   uptr name_len = exec_name_pos - buf;
 316   buf[name_len] = '\0';
 317   return name_len;
 318 }
 319
 320 #if !SANITIZER_GO
 321 void PrintCmdline() {
 322   char **argv = GetArgv();
 323   if (!argv) return;
 324   Printf("\nCommand: ");
 325   for (uptr i = 0; argv[i]; ++i)
 326     Printf("%s ", argv[i]);
 327   Printf("\n\n");
 328 }
 329 #endif
 330
 331 // Malloc hooks.
 332 static const int kMaxMallocFreeHooks = 5;
 333 struct MallocFreeHook {
 334   void (*malloc_hook)(const void *, uptr);
 335   void (*free_hook)(const void *);
 336 };
 337
 338 static MallocFreeHook MFHooks[kMaxMallocFreeHooks];
 339
 340 void RunMallocHooks(void *ptr, uptr size) {
 341   __sanitizer_malloc_hook(ptr, size);
 342   for (int i = 0; i < kMaxMallocFreeHooks; i++) {
 343     auto hook = MFHooks[i].malloc_hook;
 344     if (!hook)
 345       break;
 346     hook(ptr, size);
 347   }
 348 }
 349
 350 void RunFreeHooks(void *ptr) {
 351   __sanitizer_free_hook(ptr);
 352   for (int i = 0; i < kMaxMallocFreeHooks; i++) {
 353     auto hook = MFHooks[i].free_hook;
 354     if (!hook)
 355       break;
 356     hook(ptr);
 357   }
 358 }
 359
 360 static int InstallMallocFreeHooks(void (*malloc_hook)(const void *, uptr),
 361                                   void (*free_hook)(const void *)) {
 362   if (!malloc_hook || !free_hook) return 0;
 363   for (int i = 0; i < kMaxMallocFreeHooks; i++) {
 364     if (MFHooks[i].malloc_hook == nullptr) {
 365       MFHooks[i].malloc_hook = malloc_hook;
 366       MFHooks[i].free_hook = free_hook;
 367       return i + 1;
 368     }
 369   }
 370   return 0;
 371 }
 372
 373 void internal_sleep(unsigned seconds) {
 374   internal_usleep((u64)seconds * 1000 * 1000);
 375 }
 376 void SleepForSeconds(unsigned seconds) {
 377   internal_usleep((u64)seconds * 1000 * 1000);
 378 }
 379 void SleepForMillis(unsigned millis) { internal_usleep((u64)millis * 1000); }
 380
 381 void WaitForDebugger(unsigned seconds, const char *label) {
 382   if (seconds) {
 383     Report("Sleeping for %u second(s) %s\n", seconds, label);
 384     SleepForSeconds(seconds);
 385   }
 386 }
 387
 388 } // namespace __sanitizer
 389
 390 using namespace __sanitizer;
 391
 392 extern "C" {
 393 SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_report_error_summary,
 394                              const char *error_summary) {
 395   Printf("%s\n", error_summary);
 396 }
 397
 398 SANITIZER_INTERFACE_ATTRIBUTE
 399 int __sanitizer_acquire_crash_state() {
 400   static atomic_uint8_t in_crash_state = {};
 401   return !atomic_exchange(&in_crash_state, 1, memory_order_relaxed);
 402 }
 403
 404 SANITIZER_INTERFACE_ATTRIBUTE
 405 int __sanitizer_install_malloc_and_free_hooks(void (*malloc_hook)(const void *,
 406                                                                   uptr),
 407                                               void (*free_hook)(const void *)) {
 408   return InstallMallocFreeHooks(malloc_hook, free_hook);
 409 }
 410
 411 // Provide default (no-op) implementation of malloc hooks.
 412 SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_malloc_hook, void *ptr,
 413                              uptr size) {
 414   (void)ptr;
 415   (void)size;
 416 }
 417
 418 SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_free_hook, void *ptr) {
 419   (void)ptr;
 420 }
 421
 422 } // extern "C"