libsanitizer/tsan/tsan_interceptors.cc

   1 //===-- tsan_interceptors.cc ----------------------------------------------===//
   2 //
   3 // This file is distributed under the University of Illinois Open Source
   4 // License. See LICENSE.TXT for details.
   5 //
   6 //===----------------------------------------------------------------------===//
   7 //
   8 // This file is a part of ThreadSanitizer (TSan), a race detector.
   9 //
  10 // FIXME: move as many interceptors as possible into
  11 // sanitizer_common/sanitizer_common_interceptors.inc
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "sanitizer_common/sanitizer_atomic.h"
  15 #include "sanitizer_common/sanitizer_libc.h"
  16 #include "sanitizer_common/sanitizer_linux.h"
  17 #include "sanitizer_common/sanitizer_platform_limits_posix.h"
  18 #include "sanitizer_common/sanitizer_placement_new.h"
  19 #include "sanitizer_common/sanitizer_stacktrace.h"
  20 #include "interception/interception.h"
  21 #include "tsan_interface.h"
  22 #include "tsan_platform.h"
  23 #include "tsan_suppressions.h"
  24 #include "tsan_rtl.h"
  25 #include "tsan_mman.h"
  26 #include "tsan_fd.h"
  27
  28 using namespace __tsan;  // NOLINT
  29
  30 const int kSigCount = 65;
  31
  32 struct my_siginfo_t {
  33   // The size is determined by looking at sizeof of real siginfo_t on linux.
  34   u64 opaque[128 / sizeof(u64)];
  35 };
  36
  37 struct ucontext_t {
  38   // The size is determined by looking at sizeof of real ucontext_t on linux.
  39   u64 opaque[936 / sizeof(u64) + 1];
  40 };
  41
  42 extern "C" int pthread_attr_init(void *attr);
  43 extern "C" int pthread_attr_destroy(void *attr);
  44 DECLARE_REAL(int, pthread_attr_getdetachstate, void *, void *)
  45 extern "C" int pthread_attr_setstacksize(void *attr, uptr stacksize);
  46 extern "C" int pthread_key_create(unsigned *key, void (*destructor)(void* v));
  47 extern "C" int pthread_setspecific(unsigned key, const void *v);
  48 DECLARE_REAL(int, pthread_mutexattr_gettype, void *, void *)
  49 extern "C" int pthread_yield();
  50 extern "C" int pthread_sigmask(int how, const __sanitizer_sigset_t *set,
  51                                __sanitizer_sigset_t *oldset);
  52 // REAL(sigfillset) defined in common interceptors.
  53 DECLARE_REAL(int, sigfillset, __sanitizer_sigset_t *set)
  54 DECLARE_REAL(int, fflush, __sanitizer_FILE *fp)
  55 extern "C" void *pthread_self();
  56 extern "C" void _exit(int status);
  57 extern "C" int *__errno_location();
  58 extern "C" int fileno_unlocked(void *stream);
  59 extern "C" void *__libc_malloc(uptr size);
  60 extern "C" void *__libc_calloc(uptr size, uptr n);
  61 extern "C" void *__libc_realloc(void *ptr, uptr size);
  62 extern "C" void __libc_free(void *ptr);
  63 extern "C" int mallopt(int param, int value);
  64 extern __sanitizer_FILE *stdout, *stderr;
  65 const int PTHREAD_MUTEX_RECURSIVE = 1;
  66 const int PTHREAD_MUTEX_RECURSIVE_NP = 1;
  67 const int EINVAL = 22;
  68 const int EBUSY = 16;
  69 const int EOWNERDEAD = 130;
  70 const int EPOLL_CTL_ADD = 1;
  71 const int SIGILL = 4;
  72 const int SIGABRT = 6;
  73 const int SIGFPE = 8;
  74 const int SIGSEGV = 11;
  75 const int SIGPIPE = 13;
  76 const int SIGTERM = 15;
  77 const int SIGBUS = 7;
  78 const int SIGSYS = 31;
  79 void *const MAP_FAILED = (void*)-1;
  80 const int PTHREAD_BARRIER_SERIAL_THREAD = -1;
  81 const int MAP_FIXED = 0x10;
  82 typedef long long_t;  // NOLINT
  83
  84 // From /usr/include/unistd.h
  85 # define F_ULOCK 0      /* Unlock a previously locked region.  */
  86 # define F_LOCK  1      /* Lock a region for exclusive use.  */
  87 # define F_TLOCK 2      /* Test and lock a region for exclusive use.  */
  88 # define F_TEST  3      /* Test a region for other processes locks.  */
  89
  90 typedef void (*sighandler_t)(int sig);
  91
  92 #define errno (*__errno_location())
  93
  94 // 16K loaded modules should be enough for everyone.
  95 static const uptr kMaxModules = 1 << 14;
  96 static LoadedModule *modules;
  97 static uptr nmodules;
  98
  99 struct sigaction_t {
 100   union {
 101     sighandler_t sa_handler;
 102     void (*sa_sigaction)(int sig, my_siginfo_t *siginfo, void *uctx);
 103   };
 104   __sanitizer_sigset_t sa_mask;
 105   int sa_flags;
 106   void (*sa_restorer)();
 107 };
 108
 109 const sighandler_t SIG_DFL = (sighandler_t)0;
 110 const sighandler_t SIG_IGN = (sighandler_t)1;
 111 const sighandler_t SIG_ERR = (sighandler_t)-1;
 112 const int SA_SIGINFO = 4;
 113 const int SIG_SETMASK = 2;
 114
 115 namespace std {
 116 struct nothrow_t {};
 117 }  // namespace std
 118
 119 static sigaction_t sigactions[kSigCount];
 120
 121 namespace __tsan {
 122 struct SignalDesc {
 123   bool armed;
 124   bool sigaction;
 125   my_siginfo_t siginfo;
 126   ucontext_t ctx;
 127 };
 128
 129 struct SignalContext {
 130   int int_signal_send;
 131   atomic_uintptr_t in_blocking_func;
 132   atomic_uintptr_t have_pending_signals;
 133   SignalDesc pending_signals[kSigCount];
 134 };
 135
 136 // The object is 64-byte aligned, because we want hot data to be located in
 137 // a single cache line if possible (it's accessed in every interceptor).
 138 static ALIGNED(64) char libignore_placeholder[sizeof(LibIgnore)];
 139 static LibIgnore *libignore() {
 140   return reinterpret_cast<LibIgnore*>(&libignore_placeholder[0]);
 141 }
 142
 143 void InitializeLibIgnore() {
 144   libignore()->Init(*SuppressionContext::Get());
 145   libignore()->OnLibraryLoaded(0);
 146 }
 147
 148 }  // namespace __tsan
 149
 150 static SignalContext *SigCtx(ThreadState *thr) {
 151   SignalContext *ctx = (SignalContext*)thr->signal_ctx;
 152   if (ctx == 0 && !thr->is_dead) {
 153     ctx = (SignalContext*)MmapOrDie(sizeof(*ctx), "SignalContext");
 154     MemoryResetRange(thr, (uptr)&SigCtx, (uptr)ctx, sizeof(*ctx));
 155     thr->signal_ctx = ctx;
 156   }
 157   return ctx;
 158 }
 159
 160 static unsigned g_thread_finalize_key;
 161
 162 class ScopedInterceptor {
 163  public:
 164   ScopedInterceptor(ThreadState *thr, const char *fname, uptr pc);
 165   ~ScopedInterceptor();
 166  private:
 167   ThreadState *const thr_;
 168   const uptr pc_;
 169   bool in_ignored_lib_;
 170 };
 171
 172 ScopedInterceptor::ScopedInterceptor(ThreadState *thr, const char *fname,
 173                                      uptr pc)
 174     : thr_(thr)
 175     , pc_(pc)
 176     , in_ignored_lib_(false) {
 177   if (!thr_->ignore_interceptors) {
 178     Initialize(thr);
 179     FuncEntry(thr, pc);
 180   }
 181   DPrintf("#%d: intercept %s()\n", thr_->tid, fname);
 182   if (!thr_->in_ignored_lib && libignore()->IsIgnored(pc)) {
 183     in_ignored_lib_ = true;
 184     thr_->in_ignored_lib = true;
 185     ThreadIgnoreBegin(thr_, pc_);
 186   }
 187 }
 188
 189 ScopedInterceptor::~ScopedInterceptor() {
 190   if (in_ignored_lib_) {
 191     thr_->in_ignored_lib = false;
 192     ThreadIgnoreEnd(thr_, pc_);
 193   }
 194   if (!thr_->ignore_interceptors) {
 195     ProcessPendingSignals(thr_);
 196     FuncExit(thr_);
 197     CheckNoLocks(thr_);
 198   }
 199 }
 200
 201 #define SCOPED_INTERCEPTOR_RAW(func, ...) \
 202     ThreadState *thr = cur_thread(); \
 203     const uptr caller_pc = GET_CALLER_PC(); \
 204     ScopedInterceptor si(thr, #func, caller_pc); \
 205     const uptr pc = __sanitizer::StackTrace::GetCurrentPc(); \
 206     (void)pc; \
 207 /**/
 208
 209 #define SCOPED_TSAN_INTERCEPTOR(func, ...) \
 210     SCOPED_INTERCEPTOR_RAW(func, __VA_ARGS__); \
 211     if (REAL(func) == 0) { \
 212       Report("FATAL: ThreadSanitizer: failed to intercept %s\n", #func); \
 213       Die(); \
 214     }                                                    \
 215     if (thr->ignore_interceptors || thr->in_ignored_lib) \
 216       return REAL(func)(__VA_ARGS__); \
 217 /**/
 218
 219 #define TSAN_INTERCEPTOR(ret, func, ...) INTERCEPTOR(ret, func, __VA_ARGS__)
 220 #define TSAN_INTERCEPT(func) INTERCEPT_FUNCTION(func)
 221 #define TSAN_INTERCEPT_VER(func, ver) INTERCEPT_FUNCTION_VER(func, ver)
 222
 223 #define BLOCK_REAL(name) (BlockingCall(thr), REAL(name))
 224
 225 struct BlockingCall {
 226   explicit BlockingCall(ThreadState *thr)
 227       : thr(thr)
 228       , ctx(SigCtx(thr)) {
 229     for (;;) {
 230       atomic_store(&ctx->in_blocking_func, 1, memory_order_relaxed);
 231       if (atomic_load(&ctx->have_pending_signals, memory_order_relaxed) == 0)
 232         break;
 233       atomic_store(&ctx->in_blocking_func, 0, memory_order_relaxed);
 234       ProcessPendingSignals(thr);
 235     }
 236     // When we are in a "blocking call", we process signals asynchronously
 237     // (right when they arrive). In this context we do not expect to be
 238     // executing any user/runtime code. The known interceptor sequence when
 239     // this is not true is: pthread_join -> munmap(stack). It's fine
 240     // to ignore munmap in this case -- we handle stack shadow separately.
 241     thr->ignore_interceptors++;
 242   }
 243
 244   ~BlockingCall() {
 245     thr->ignore_interceptors--;
 246     atomic_store(&ctx->in_blocking_func, 0, memory_order_relaxed);
 247   }
 248
 249   ThreadState *thr;
 250   SignalContext *ctx;
 251 };
 252
 253 TSAN_INTERCEPTOR(unsigned, sleep, unsigned sec) {
 254   SCOPED_TSAN_INTERCEPTOR(sleep, sec);
 255   unsigned res = BLOCK_REAL(sleep)(sec);
 256   AfterSleep(thr, pc);
 257   return res;
 258 }
 259
 260 TSAN_INTERCEPTOR(int, usleep, long_t usec) {
 261   SCOPED_TSAN_INTERCEPTOR(usleep, usec);
 262   int res = BLOCK_REAL(usleep)(usec);
 263   AfterSleep(thr, pc);
 264   return res;
 265 }
 266
 267 TSAN_INTERCEPTOR(int, nanosleep, void *req, void *rem) {
 268   SCOPED_TSAN_INTERCEPTOR(nanosleep, req, rem);
 269   int res = BLOCK_REAL(nanosleep)(req, rem);
 270   AfterSleep(thr, pc);
 271   return res;
 272 }
 273
 274 class AtExitContext {
 275  public:
 276   AtExitContext()
 277     : mtx_(MutexTypeAtExit, StatMtxAtExit)
 278     , stack_(MBlockAtExit) {
 279   }
 280
 281   typedef void(*atexit_cb_t)();
 282
 283   int atexit(ThreadState *thr, uptr pc, bool is_on_exit,
 284              atexit_cb_t f, void *arg, void *dso) {
 285     Lock l(&mtx_);
 286     Release(thr, pc, (uptr)this);
 287     atexit_t *a = stack_.PushBack();
 288     a->cb = f;
 289     a->arg = arg;
 290     a->dso = dso;
 291     a->is_on_exit = is_on_exit;
 292     return 0;
 293   }
 294
 295   void exit(ThreadState *thr, uptr pc) {
 296     for (;;) {
 297       atexit_t a = {};
 298       {
 299         Lock l(&mtx_);
 300         if (stack_.Size() != 0) {
 301           a = stack_[stack_.Size() - 1];
 302           stack_.PopBack();
 303           Acquire(thr, pc, (uptr)this);
 304         }
 305       }
 306       if (a.cb == 0)
 307         break;
 308       VPrintf(2, "#%d: executing atexit func %p(%p) dso=%p\n",
 309           thr->tid, a.cb, a.arg, a.dso);
 310       if (a.is_on_exit)
 311         ((void(*)(int status, void *arg))a.cb)(0, a.arg);
 312       else
 313         ((void(*)(void *arg, void *dso))a.cb)(a.arg, a.dso);
 314     }
 315   }
 316
 317  private:
 318   struct atexit_t {
 319     atexit_cb_t cb;
 320     void *arg;
 321     void *dso;
 322     bool is_on_exit;
 323   };
 324
 325   static const int kMaxAtExit = 1024;
 326   Mutex mtx_;
 327   Vector<atexit_t> stack_;
 328 };
 329
 330 static AtExitContext *atexit_ctx;
 331
 332 TSAN_INTERCEPTOR(int, atexit, void (*f)()) {
 333   if (cur_thread()->in_symbolizer)
 334     return 0;
 335   // We want to setup the atexit callback even if we are in ignored lib
 336   // or after fork.
 337   SCOPED_INTERCEPTOR_RAW(atexit, f);
 338   return atexit_ctx->atexit(thr, pc, false, (void(*)())f, 0, 0);
 339 }
 340
 341 TSAN_INTERCEPTOR(int, on_exit, void(*f)(int, void*), void *arg) {
 342   if (cur_thread()->in_symbolizer)
 343     return 0;
 344   SCOPED_TSAN_INTERCEPTOR(on_exit, f, arg);
 345   return atexit_ctx->atexit(thr, pc, true, (void(*)())f, arg, 0);
 346 }
 347
 348 bool IsSaticModule(void *dso) {
 349   if (modules == 0)
 350     return false;
 351   for (uptr i = 0; i < nmodules; i++) {
 352     if (modules[i].containsAddress((uptr)dso))
 353       return true;
 354   }
 355   return false;
 356 }
 357
 358 TSAN_INTERCEPTOR(int, __cxa_atexit, void (*f)(void *a), void *arg, void *dso) {
 359   if (cur_thread()->in_symbolizer)
 360     return 0;
 361   SCOPED_TSAN_INTERCEPTOR(__cxa_atexit, f, arg, dso);
 362   // If it's the main executable or a statically loaded library,
 363   // we will call the callback.
 364   if (dso == 0 || IsSaticModule(dso))
 365     return atexit_ctx->atexit(thr, pc, false, (void(*)())f, arg, dso);
 366
 367   // Dynamically load module, don't know when to call the callback for it.
 368   // Memory allocation in __cxa_atexit will race with free during exit,
 369   // because we do not see synchronization around atexit callback list.
 370   ThreadIgnoreBegin(thr, pc);
 371   int res = REAL(__cxa_atexit)(f, arg, dso);
 372   ThreadIgnoreEnd(thr, pc);
 373   return res;
 374 }
 375
 376 // Cleanup old bufs.
 377 static void JmpBufGarbageCollect(ThreadState *thr, uptr sp) {
 378   for (uptr i = 0; i < thr->jmp_bufs.Size(); i++) {
 379     JmpBuf *buf = &thr->jmp_bufs[i];
 380     if (buf->sp <= sp) {
 381       uptr sz = thr->jmp_bufs.Size();
 382       thr->jmp_bufs[i] = thr->jmp_bufs[sz - 1];
 383       thr->jmp_bufs.PopBack();
 384       i--;
 385     }
 386   }
 387 }
 388
 389 static void SetJmp(ThreadState *thr, uptr sp, uptr mangled_sp) {
 390   if (thr->shadow_stack_pos == 0)  // called from libc guts during bootstrap
 391     return;
 392   // Cleanup old bufs.
 393   JmpBufGarbageCollect(thr, sp);
 394   // Remember the buf.
 395   JmpBuf *buf = thr->jmp_bufs.PushBack();
 396   buf->sp = sp;
 397   buf->mangled_sp = mangled_sp;
 398   buf->shadow_stack_pos = thr->shadow_stack_pos;
 399   SignalContext *sctx = SigCtx(thr);
 400   buf->int_signal_send = sctx ? sctx->int_signal_send : 0;
 401   buf->in_blocking_func = sctx ?
 402       atomic_load(&sctx->in_blocking_func, memory_order_relaxed) :
 403       false;
 404   buf->in_signal_handler = atomic_load(&thr->in_signal_handler,
 405       memory_order_relaxed);
 406 }
 407
 408 static void LongJmp(ThreadState *thr, uptr *env) {
 409   uptr mangled_sp = env[6];
 410   // Find the saved buf by mangled_sp.
 411   for (uptr i = 0; i < thr->jmp_bufs.Size(); i++) {
 412     JmpBuf *buf = &thr->jmp_bufs[i];
 413     if (buf->mangled_sp == mangled_sp) {
 414       CHECK_GE(thr->shadow_stack_pos, buf->shadow_stack_pos);
 415       // Unwind the stack.
 416       while (thr->shadow_stack_pos > buf->shadow_stack_pos)
 417         FuncExit(thr);
 418       SignalContext *sctx = SigCtx(thr);
 419       if (sctx) {
 420         sctx->int_signal_send = buf->int_signal_send;
 421         atomic_store(&sctx->in_blocking_func, buf->in_blocking_func,
 422             memory_order_relaxed);
 423       }
 424       atomic_store(&thr->in_signal_handler, buf->in_signal_handler,
 425           memory_order_relaxed);
 426       JmpBufGarbageCollect(thr, buf->sp - 1);  // do not collect buf->sp
 427       return;
 428     }
 429   }
 430   Printf("ThreadSanitizer: can't find longjmp buf\n");
 431   CHECK(0);
 432 }
 433
 434 // FIXME: put everything below into a common extern "C" block?
 435 extern "C" void __tsan_setjmp(uptr sp, uptr mangled_sp) {
 436   SetJmp(cur_thread(), sp, mangled_sp);
 437 }
 438
 439 // Not called.  Merely to satisfy TSAN_INTERCEPT().
 440 extern "C" SANITIZER_INTERFACE_ATTRIBUTE
 441 int __interceptor_setjmp(void *env);
 442 extern "C" int __interceptor_setjmp(void *env) {
 443   CHECK(0);
 444   return 0;
 445 }
 446
 447 // FIXME: any reason to have a separate declaration?
 448 extern "C" SANITIZER_INTERFACE_ATTRIBUTE
 449 int __interceptor__setjmp(void *env);
 450 extern "C" int __interceptor__setjmp(void *env) {
 451   CHECK(0);
 452   return 0;
 453 }
 454
 455 extern "C" SANITIZER_INTERFACE_ATTRIBUTE
 456 int __interceptor_sigsetjmp(void *env);
 457 extern "C" int __interceptor_sigsetjmp(void *env) {
 458   CHECK(0);
 459   return 0;
 460 }
 461
 462 extern "C" SANITIZER_INTERFACE_ATTRIBUTE
 463 int __interceptor___sigsetjmp(void *env);
 464 extern "C" int __interceptor___sigsetjmp(void *env) {
 465   CHECK(0);
 466   return 0;
 467 }
 468
 469 extern "C" int setjmp(void *env);
 470 extern "C" int _setjmp(void *env);
 471 extern "C" int sigsetjmp(void *env);
 472 extern "C" int __sigsetjmp(void *env);
 473 DEFINE_REAL(int, setjmp, void *env)
 474 DEFINE_REAL(int, _setjmp, void *env)
 475 DEFINE_REAL(int, sigsetjmp, void *env)
 476 DEFINE_REAL(int, __sigsetjmp, void *env)
 477
 478 TSAN_INTERCEPTOR(void, longjmp, uptr *env, int val) {
 479   {
 480     SCOPED_TSAN_INTERCEPTOR(longjmp, env, val);
 481   }
 482   LongJmp(cur_thread(), env);
 483   REAL(longjmp)(env, val);
 484 }
 485
 486 TSAN_INTERCEPTOR(void, siglongjmp, uptr *env, int val) {
 487   {
 488     SCOPED_TSAN_INTERCEPTOR(siglongjmp, env, val);
 489   }
 490   LongJmp(cur_thread(), env);
 491   REAL(siglongjmp)(env, val);
 492 }
 493
 494 TSAN_INTERCEPTOR(void*, malloc, uptr size) {
 495   if (cur_thread()->in_symbolizer)
 496     return __libc_malloc(size);
 497   void *p = 0;
 498   {
 499     SCOPED_INTERCEPTOR_RAW(malloc, size);
 500     p = user_alloc(thr, pc, size);
 501   }
 502   invoke_malloc_hook(p, size);
 503   return p;
 504 }
 505
 506 TSAN_INTERCEPTOR(void*, __libc_memalign, uptr align, uptr sz) {
 507   SCOPED_TSAN_INTERCEPTOR(__libc_memalign, align, sz);
 508   return user_alloc(thr, pc, sz, align);
 509 }
 510
 511 TSAN_INTERCEPTOR(void*, calloc, uptr size, uptr n) {
 512   if (cur_thread()->in_symbolizer)
 513     return __libc_calloc(size, n);
 514   if (__sanitizer::CallocShouldReturnNullDueToOverflow(size, n))
 515     return AllocatorReturnNull();
 516   void *p = 0;
 517   {
 518     SCOPED_INTERCEPTOR_RAW(calloc, size, n);
 519     p = user_alloc(thr, pc, n * size);
 520     if (p)
 521       internal_memset(p, 0, n * size);
 522   }
 523   invoke_malloc_hook(p, n * size);
 524   return p;
 525 }
 526
 527 TSAN_INTERCEPTOR(void*, realloc, void *p, uptr size) {
 528   if (cur_thread()->in_symbolizer)
 529     return __libc_realloc(p, size);
 530   if (p)
 531     invoke_free_hook(p);
 532   {
 533     SCOPED_INTERCEPTOR_RAW(realloc, p, size);
 534     p = user_realloc(thr, pc, p, size);
 535   }
 536   invoke_malloc_hook(p, size);
 537   return p;
 538 }
 539
 540 TSAN_INTERCEPTOR(void, free, void *p) {
 541   if (p == 0)
 542     return;
 543   if (cur_thread()->in_symbolizer)
 544     return __libc_free(p);
 545   invoke_free_hook(p);
 546   SCOPED_INTERCEPTOR_RAW(free, p);
 547   user_free(thr, pc, p);
 548 }
 549
 550 TSAN_INTERCEPTOR(void, cfree, void *p) {
 551   if (p == 0)
 552     return;
 553   if (cur_thread()->in_symbolizer)
 554     return __libc_free(p);
 555   invoke_free_hook(p);
 556   SCOPED_INTERCEPTOR_RAW(cfree, p);
 557   user_free(thr, pc, p);
 558 }
 559
 560 TSAN_INTERCEPTOR(uptr, malloc_usable_size, void *p) {
 561   SCOPED_INTERCEPTOR_RAW(malloc_usable_size, p);
 562   return user_alloc_usable_size(p);
 563 }
 564
 565 #define OPERATOR_NEW_BODY(mangled_name) \
 566   if (cur_thread()->in_symbolizer) \
 567     return __libc_malloc(size); \
 568   void *p = 0; \
 569   {  \
 570     SCOPED_INTERCEPTOR_RAW(mangled_name, size); \
 571     p = user_alloc(thr, pc, size); \
 572   }  \
 573   invoke_malloc_hook(p, size);  \
 574   return p;
 575
 576 SANITIZER_INTERFACE_ATTRIBUTE
 577 void *operator new(__sanitizer::uptr size);
 578 void *operator new(__sanitizer::uptr size) {
 579   OPERATOR_NEW_BODY(_Znwm);
 580 }
 581
 582 SANITIZER_INTERFACE_ATTRIBUTE
 583 void *operator new[](__sanitizer::uptr size);
 584 void *operator new[](__sanitizer::uptr size) {
 585   OPERATOR_NEW_BODY(_Znam);
 586 }
 587
 588 SANITIZER_INTERFACE_ATTRIBUTE
 589 void *operator new(__sanitizer::uptr size, std::nothrow_t const&);
 590 void *operator new(__sanitizer::uptr size, std::nothrow_t const&) {
 591   OPERATOR_NEW_BODY(_ZnwmRKSt9nothrow_t);
 592 }
 593
 594 SANITIZER_INTERFACE_ATTRIBUTE
 595 void *operator new[](__sanitizer::uptr size, std::nothrow_t const&);
 596 void *operator new[](__sanitizer::uptr size, std::nothrow_t const&) {
 597   OPERATOR_NEW_BODY(_ZnamRKSt9nothrow_t);
 598 }
 599
 600 #define OPERATOR_DELETE_BODY(mangled_name) \
 601   if (ptr == 0) return;  \
 602   if (cur_thread()->in_symbolizer) \
 603     return __libc_free(ptr); \
 604   invoke_free_hook(ptr);  \
 605   SCOPED_INTERCEPTOR_RAW(mangled_name, ptr);  \
 606   user_free(thr, pc, ptr);
 607
 608 SANITIZER_INTERFACE_ATTRIBUTE
 609 void operator delete(void *ptr) throw();
 610 void operator delete(void *ptr) throw() {
 611   OPERATOR_DELETE_BODY(_ZdlPv);
 612 }
 613
 614 SANITIZER_INTERFACE_ATTRIBUTE
 615 void operator delete[](void *ptr) throw();
 616 void operator delete[](void *ptr) throw() {
 617   OPERATOR_DELETE_BODY(_ZdaPv);
 618 }
 619
 620 SANITIZER_INTERFACE_ATTRIBUTE
 621 void operator delete(void *ptr, std::nothrow_t const&);
 622 void operator delete(void *ptr, std::nothrow_t const&) {
 623   OPERATOR_DELETE_BODY(_ZdlPvRKSt9nothrow_t);
 624 }
 625
 626 SANITIZER_INTERFACE_ATTRIBUTE
 627 void operator delete[](void *ptr, std::nothrow_t const&);
 628 void operator delete[](void *ptr, std::nothrow_t const&) {
 629   OPERATOR_DELETE_BODY(_ZdaPvRKSt9nothrow_t);
 630 }
 631
 632 TSAN_INTERCEPTOR(uptr, strlen, const char *s) {
 633   SCOPED_TSAN_INTERCEPTOR(strlen, s);
 634   uptr len = internal_strlen(s);
 635   MemoryAccessRange(thr, pc, (uptr)s, len + 1, false);
 636   return len;
 637 }
 638
 639 TSAN_INTERCEPTOR(void*, memset, void *dst, int v, uptr size) {
 640   SCOPED_TSAN_INTERCEPTOR(memset, dst, v, size);
 641   MemoryAccessRange(thr, pc, (uptr)dst, size, true);
 642   return internal_memset(dst, v, size);
 643 }
 644
 645 TSAN_INTERCEPTOR(void*, memcpy, void *dst, const void *src, uptr size) {
 646   SCOPED_TSAN_INTERCEPTOR(memcpy, dst, src, size);
 647   MemoryAccessRange(thr, pc, (uptr)dst, size, true);
 648   MemoryAccessRange(thr, pc, (uptr)src, size, false);
 649   return internal_memcpy(dst, src, size);
 650 }
 651
 652 TSAN_INTERCEPTOR(int, memcmp, const void *s1, const void *s2, uptr n) {
 653   SCOPED_TSAN_INTERCEPTOR(memcmp, s1, s2, n);
 654   int res = 0;
 655   uptr len = 0;
 656   for (; len < n; len++) {
 657     if ((res = ((unsigned char*)s1)[len] - ((unsigned char*)s2)[len]))
 658       break;
 659   }
 660   MemoryAccessRange(thr, pc, (uptr)s1, len < n ? len + 1 : n, false);
 661   MemoryAccessRange(thr, pc, (uptr)s2, len < n ? len + 1 : n, false);
 662   return res;
 663 }
 664
 665 TSAN_INTERCEPTOR(void*, memmove, void *dst, void *src, uptr n) {
 666   SCOPED_TSAN_INTERCEPTOR(memmove, dst, src, n);
 667   MemoryAccessRange(thr, pc, (uptr)dst, n, true);
 668   MemoryAccessRange(thr, pc, (uptr)src, n, false);
 669   return REAL(memmove)(dst, src, n);
 670 }
 671
 672 TSAN_INTERCEPTOR(char*, strchr, char *s, int c) {
 673   SCOPED_TSAN_INTERCEPTOR(strchr, s, c);
 674   char *res = REAL(strchr)(s, c);
 675   uptr len = res ? (char*)res - (char*)s + 1 : internal_strlen(s) + 1;
 676   MemoryAccessRange(thr, pc, (uptr)s, len, false);
 677   return res;
 678 }
 679
 680 TSAN_INTERCEPTOR(char*, strchrnul, char *s, int c) {
 681   SCOPED_TSAN_INTERCEPTOR(strchrnul, s, c);
 682   char *res = REAL(strchrnul)(s, c);
 683   uptr len = (char*)res - (char*)s + 1;
 684   MemoryAccessRange(thr, pc, (uptr)s, len, false);
 685   return res;
 686 }
 687
 688 TSAN_INTERCEPTOR(char*, strrchr, char *s, int c) {
 689   SCOPED_TSAN_INTERCEPTOR(strrchr, s, c);
 690   MemoryAccessRange(thr, pc, (uptr)s, internal_strlen(s) + 1, false);
 691   return REAL(strrchr)(s, c);
 692 }
 693
 694 TSAN_INTERCEPTOR(char*, strcpy, char *dst, const char *src) {  // NOLINT
 695   SCOPED_TSAN_INTERCEPTOR(strcpy, dst, src);  // NOLINT
 696   uptr srclen = internal_strlen(src);
 697   MemoryAccessRange(thr, pc, (uptr)dst, srclen + 1, true);
 698   MemoryAccessRange(thr, pc, (uptr)src, srclen + 1, false);
 699   return REAL(strcpy)(dst, src);  // NOLINT
 700 }
 701
 702 TSAN_INTERCEPTOR(char*, strncpy, char *dst, char *src, uptr n) {
 703   SCOPED_TSAN_INTERCEPTOR(strncpy, dst, src, n);
 704   uptr srclen = internal_strnlen(src, n);
 705   MemoryAccessRange(thr, pc, (uptr)dst, n, true);
 706   MemoryAccessRange(thr, pc, (uptr)src, min(srclen + 1, n), false);
 707   return REAL(strncpy)(dst, src, n);
 708 }
 709
 710 TSAN_INTERCEPTOR(const char*, strstr, const char *s1, const char *s2) {
 711   SCOPED_TSAN_INTERCEPTOR(strstr, s1, s2);
 712   const char *res = REAL(strstr)(s1, s2);
 713   uptr len1 = internal_strlen(s1);
 714   uptr len2 = internal_strlen(s2);
 715   MemoryAccessRange(thr, pc, (uptr)s1, len1 + 1, false);
 716   MemoryAccessRange(thr, pc, (uptr)s2, len2 + 1, false);
 717   return res;
 718 }
 719
 720 TSAN_INTERCEPTOR(char*, strdup, const char *str) {
 721   SCOPED_TSAN_INTERCEPTOR(strdup, str);
 722   // strdup will call malloc, so no instrumentation is required here.
 723   return REAL(strdup)(str);
 724 }
 725
 726 static bool fix_mmap_addr(void **addr, long_t sz, int flags) {
 727   if (*addr) {
 728     if (!IsAppMem((uptr)*addr) || !IsAppMem((uptr)*addr + sz - 1)) {
 729       if (flags & MAP_FIXED) {
 730         errno = EINVAL;
 731         return false;
 732       } else {
 733         *addr = 0;
 734       }
 735     }
 736   }
 737   return true;
 738 }
 739
 740 TSAN_INTERCEPTOR(void*, mmap, void *addr, long_t sz, int prot,
 741                          int flags, int fd, unsigned off) {
 742   SCOPED_TSAN_INTERCEPTOR(mmap, addr, sz, prot, flags, fd, off);
 743   if (!fix_mmap_addr(&addr, sz, flags))
 744     return MAP_FAILED;
 745   void *res = REAL(mmap)(addr, sz, prot, flags, fd, off);
 746   if (res != MAP_FAILED) {
 747     if (fd > 0)
 748       FdAccess(thr, pc, fd);
 749     MemoryRangeImitateWrite(thr, pc, (uptr)res, sz);
 750   }
 751   return res;
 752 }
 753
 754 TSAN_INTERCEPTOR(void*, mmap64, void *addr, long_t sz, int prot,
 755                            int flags, int fd, u64 off) {
 756   SCOPED_TSAN_INTERCEPTOR(mmap64, addr, sz, prot, flags, fd, off);
 757   if (!fix_mmap_addr(&addr, sz, flags))
 758     return MAP_FAILED;
 759   void *res = REAL(mmap64)(addr, sz, prot, flags, fd, off);
 760   if (res != MAP_FAILED) {
 761     if (fd > 0)
 762       FdAccess(thr, pc, fd);
 763     MemoryRangeImitateWrite(thr, pc, (uptr)res, sz);
 764   }
 765   return res;
 766 }
 767
 768 TSAN_INTERCEPTOR(int, munmap, void *addr, long_t sz) {
 769   SCOPED_TSAN_INTERCEPTOR(munmap, addr, sz);
 770   DontNeedShadowFor((uptr)addr, sz);
 771   int res = REAL(munmap)(addr, sz);
 772   return res;
 773 }
 774
 775 TSAN_INTERCEPTOR(void*, memalign, uptr align, uptr sz) {
 776   SCOPED_INTERCEPTOR_RAW(memalign, align, sz);
 777   return user_alloc(thr, pc, sz, align);
 778 }
 779
 780 TSAN_INTERCEPTOR(void*, aligned_alloc, uptr align, uptr sz) {
 781   SCOPED_INTERCEPTOR_RAW(memalign, align, sz);
 782   return user_alloc(thr, pc, sz, align);
 783 }
 784
 785 TSAN_INTERCEPTOR(void*, valloc, uptr sz) {
 786   SCOPED_INTERCEPTOR_RAW(valloc, sz);
 787   return user_alloc(thr, pc, sz, GetPageSizeCached());
 788 }
 789
 790 TSAN_INTERCEPTOR(void*, pvalloc, uptr sz) {
 791   SCOPED_INTERCEPTOR_RAW(pvalloc, sz);
 792   sz = RoundUp(sz, GetPageSizeCached());
 793   return user_alloc(thr, pc, sz, GetPageSizeCached());
 794 }
 795
 796 TSAN_INTERCEPTOR(int, posix_memalign, void **memptr, uptr align, uptr sz) {
 797   SCOPED_INTERCEPTOR_RAW(posix_memalign, memptr, align, sz);
 798   *memptr = user_alloc(thr, pc, sz, align);
 799   return 0;
 800 }
 801
 802 // Used in thread-safe function static initialization.
 803 extern "C" int INTERFACE_ATTRIBUTE __cxa_guard_acquire(atomic_uint32_t *g) {
 804   SCOPED_INTERCEPTOR_RAW(__cxa_guard_acquire, g);
 805   for (;;) {
 806     u32 cmp = atomic_load(g, memory_order_acquire);
 807     if (cmp == 0) {
 808       if (atomic_compare_exchange_strong(g, &cmp, 1<<16, memory_order_relaxed))
 809         return 1;
 810     } else if (cmp == 1) {
 811       Acquire(thr, pc, (uptr)g);
 812       return 0;
 813     } else {
 814       internal_sched_yield();
 815     }
 816   }
 817 }
 818
 819 extern "C" void INTERFACE_ATTRIBUTE __cxa_guard_release(atomic_uint32_t *g) {
 820   SCOPED_INTERCEPTOR_RAW(__cxa_guard_release, g);
 821   Release(thr, pc, (uptr)g);
 822   atomic_store(g, 1, memory_order_release);
 823 }
 824
 825 extern "C" void INTERFACE_ATTRIBUTE __cxa_guard_abort(atomic_uint32_t *g) {
 826   SCOPED_INTERCEPTOR_RAW(__cxa_guard_abort, g);
 827   atomic_store(g, 0, memory_order_relaxed);
 828 }
 829
 830 static void thread_finalize(void *v) {
 831   uptr iter = (uptr)v;
 832   if (iter > 1) {
 833     if (pthread_setspecific(g_thread_finalize_key, (void*)(iter - 1))) {
 834       Printf("ThreadSanitizer: failed to set thread key\n");
 835       Die();
 836     }
 837     return;
 838   }
 839   {
 840     ThreadState *thr = cur_thread();
 841     ThreadFinish(thr);
 842     SignalContext *sctx = thr->signal_ctx;
 843     if (sctx) {
 844       thr->signal_ctx = 0;
 845       UnmapOrDie(sctx, sizeof(*sctx));
 846     }
 847   }
 848 }
 849
 850
 851 struct ThreadParam {
 852   void* (*callback)(void *arg);
 853   void *param;
 854   atomic_uintptr_t tid;
 855 };
 856
 857 extern "C" void *__tsan_thread_start_func(void *arg) {
 858   ThreadParam *p = (ThreadParam*)arg;
 859   void* (*callback)(void *arg) = p->callback;
 860   void *param = p->param;
 861   int tid = 0;
 862   {
 863     ThreadState *thr = cur_thread();
 864     // Thread-local state is not initialized yet.
 865     ScopedIgnoreInterceptors ignore;
 866     if (pthread_setspecific(g_thread_finalize_key,
 867                             (void *)kPthreadDestructorIterations)) {
 868       Printf("ThreadSanitizer: failed to set thread key\n");
 869       Die();
 870     }
 871     while ((tid = atomic_load(&p->tid, memory_order_acquire)) == 0)
 872       pthread_yield();
 873     atomic_store(&p->tid, 0, memory_order_release);
 874     ThreadStart(thr, tid, GetTid());
 875   }
 876   void *res = callback(param);
 877   // Prevent the callback from being tail called,
 878   // it mixes up stack traces.
 879   volatile int foo = 42;
 880   foo++;
 881   return res;
 882 }
 883
 884 TSAN_INTERCEPTOR(int, pthread_create,
 885     void *th, void *attr, void *(*callback)(void*), void * param) {
 886   SCOPED_INTERCEPTOR_RAW(pthread_create, th, attr, callback, param);
 887   if (ctx->after_multithreaded_fork) {
 888     if (flags()->die_after_fork) {
 889       Report("ThreadSanitizer: starting new threads after multi-threaded "
 890           "fork is not supported. Dying (set die_after_fork=0 to override)\n");
 891       Die();
 892     } else {
 893       VPrintf(1, "ThreadSanitizer: starting new threads after multi-threaded "
 894           "fork is not supported (pid %d). Continuing because of "
 895           "die_after_fork=0, but you are on your own\n", internal_getpid());
 896     }
 897   }
 898   __sanitizer_pthread_attr_t myattr;
 899   if (attr == 0) {
 900     pthread_attr_init(&myattr);
 901     attr = &myattr;
 902   }
 903   int detached = 0;
 904   REAL(pthread_attr_getdetachstate)(attr, &detached);
 905   AdjustStackSize(attr);
 906
 907   ThreadParam p;
 908   p.callback = callback;
 909   p.param = param;
 910   atomic_store(&p.tid, 0, memory_order_relaxed);
 911   int res = -1;
 912   {
 913     // Otherwise we see false positives in pthread stack manipulation.
 914     ScopedIgnoreInterceptors ignore;
 915     ThreadIgnoreBegin(thr, pc);
 916     res = REAL(pthread_create)(th, attr, __tsan_thread_start_func, &p);
 917     ThreadIgnoreEnd(thr, pc);
 918   }
 919   if (res == 0) {
 920     int tid = ThreadCreate(thr, pc, *(uptr*)th, detached);
 921     CHECK_NE(tid, 0);
 922     atomic_store(&p.tid, tid, memory_order_release);
 923     while (atomic_load(&p.tid, memory_order_acquire) != 0)
 924       pthread_yield();
 925   }
 926   if (attr == &myattr)
 927     pthread_attr_destroy(&myattr);
 928   return res;
 929 }
 930
 931 TSAN_INTERCEPTOR(int, pthread_join, void *th, void **ret) {
 932   SCOPED_INTERCEPTOR_RAW(pthread_join, th, ret);
 933   int tid = ThreadTid(thr, pc, (uptr)th);
 934   ThreadIgnoreBegin(thr, pc);
 935   int res = BLOCK_REAL(pthread_join)(th, ret);
 936   ThreadIgnoreEnd(thr, pc);
 937   if (res == 0) {
 938     ThreadJoin(thr, pc, tid);
 939   }
 940   return res;
 941 }
 942
 943 TSAN_INTERCEPTOR(int, pthread_detach, void *th) {
 944   SCOPED_TSAN_INTERCEPTOR(pthread_detach, th);
 945   int tid = ThreadTid(thr, pc, (uptr)th);
 946   int res = REAL(pthread_detach)(th);
 947   if (res == 0) {
 948     ThreadDetach(thr, pc, tid);
 949   }
 950   return res;
 951 }
 952
 953 // Problem:
 954 // NPTL implementation of pthread_cond has 2 versions (2.2.5 and 2.3.2).
 955 // pthread_cond_t has different size in the different versions.
 956 // If call new REAL functions for old pthread_cond_t, they will corrupt memory
 957 // after pthread_cond_t (old cond is smaller).
 958 // If we call old REAL functions for new pthread_cond_t, we will lose  some
 959 // functionality (e.g. old functions do not support waiting against
 960 // CLOCK_REALTIME).
 961 // Proper handling would require to have 2 versions of interceptors as well.
 962 // But this is messy, in particular requires linker scripts when sanitizer
 963 // runtime is linked into a shared library.
 964 // Instead we assume we don't have dynamic libraries built against old
 965 // pthread (2.2.5 is dated by 2002). And provide legacy_pthread_cond flag
 966 // that allows to work with old libraries (but this mode does not support
 967 // some features, e.g. pthread_condattr_getpshared).
 968 static void *init_cond(void *c, bool force = false) {
 969   // sizeof(pthread_cond_t) >= sizeof(uptr) in both versions.
 970   // So we allocate additional memory on the side large enough to hold
 971   // any pthread_cond_t object. Always call new REAL functions, but pass
 972   // the aux object to them.
 973   // Note: the code assumes that PTHREAD_COND_INITIALIZER initializes
 974   // first word of pthread_cond_t to zero.
 975   // It's all relevant only for linux.
 976   if (!common_flags()->legacy_pthread_cond)
 977     return c;
 978   atomic_uintptr_t *p = (atomic_uintptr_t*)c;
 979   uptr cond = atomic_load(p, memory_order_acquire);
 980   if (!force && cond != 0)
 981     return (void*)cond;
 982   void *newcond = WRAP(malloc)(pthread_cond_t_sz);
 983   internal_memset(newcond, 0, pthread_cond_t_sz);
 984   if (atomic_compare_exchange_strong(p, &cond, (uptr)newcond,
 985       memory_order_acq_rel))
 986     return newcond;
 987   WRAP(free)(newcond);
 988   return (void*)cond;
 989 }
 990
 991 struct CondMutexUnlockCtx {
 992   ThreadState *thr;
 993   uptr pc;
 994   void *m;
 995 };
 996
 997 static void cond_mutex_unlock(CondMutexUnlockCtx *arg) {
 998   MutexLock(arg->thr, arg->pc, (uptr)arg->m);
 999 }
1000
1001 INTERCEPTOR(int, pthread_cond_init, void *c, void *a) {
1002   void *cond = init_cond(c, true);
1003   SCOPED_TSAN_INTERCEPTOR(pthread_cond_init, cond, a);
1004   MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), true);
1005   return REAL(pthread_cond_init)(cond, a);
1006 }
1007
1008 INTERCEPTOR(int, pthread_cond_wait, void *c, void *m) {
1009   void *cond = init_cond(c);
1010   SCOPED_TSAN_INTERCEPTOR(pthread_cond_wait, cond, m);
1011   MutexUnlock(thr, pc, (uptr)m);
1012   MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), false);
1013   CondMutexUnlockCtx arg = {thr, pc, m};
1014   // This ensures that we handle mutex lock even in case of pthread_cancel.
1015   // See test/tsan/cond_cancel.cc.
1016   int res = call_pthread_cancel_with_cleanup(
1017       (int(*)(void *c, void *m, void *abstime))REAL(pthread_cond_wait),
1018       cond, m, 0, (void(*)(void *arg))cond_mutex_unlock, &arg);
1019   if (res == errno_EOWNERDEAD)
1020     MutexRepair(thr, pc, (uptr)m);
1021   MutexLock(thr, pc, (uptr)m);
1022   return res;
1023 }
1024
1025 INTERCEPTOR(int, pthread_cond_timedwait, void *c, void *m, void *abstime) {
1026   void *cond = init_cond(c);
1027   SCOPED_TSAN_INTERCEPTOR(pthread_cond_timedwait, cond, m, abstime);
1028   MutexUnlock(thr, pc, (uptr)m);
1029   MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), false);
1030   CondMutexUnlockCtx arg = {thr, pc, m};
1031   // This ensures that we handle mutex lock even in case of pthread_cancel.
1032   // See test/tsan/cond_cancel.cc.
1033   int res = call_pthread_cancel_with_cleanup(
1034       REAL(pthread_cond_timedwait), cond, m, abstime,
1035       (void(*)(void *arg))cond_mutex_unlock, &arg);
1036   if (res == errno_EOWNERDEAD)
1037     MutexRepair(thr, pc, (uptr)m);
1038   MutexLock(thr, pc, (uptr)m);
1039   return res;
1040 }
1041
1042 INTERCEPTOR(int, pthread_cond_signal, void *c) {
1043   void *cond = init_cond(c);
1044   SCOPED_TSAN_INTERCEPTOR(pthread_cond_signal, cond);
1045   MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), false);
1046   return REAL(pthread_cond_signal)(cond);
1047 }
1048
1049 INTERCEPTOR(int, pthread_cond_broadcast, void *c) {
1050   void *cond = init_cond(c);
1051   SCOPED_TSAN_INTERCEPTOR(pthread_cond_broadcast, cond);
1052   MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), false);
1053   return REAL(pthread_cond_broadcast)(cond);
1054 }
1055
1056 INTERCEPTOR(int, pthread_cond_destroy, void *c) {
1057   void *cond = init_cond(c);
1058   SCOPED_TSAN_INTERCEPTOR(pthread_cond_destroy, cond);
1059   MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), true);
1060   int res = REAL(pthread_cond_destroy)(cond);
1061   if (common_flags()->legacy_pthread_cond) {
1062     // Free our aux cond and zero the pointer to not leave dangling pointers.
1063     WRAP(free)(cond);
1064     atomic_store((atomic_uintptr_t*)c, 0, memory_order_relaxed);
1065   }
1066   return res;
1067 }
1068
1069 TSAN_INTERCEPTOR(int, pthread_mutex_init, void *m, void *a) {
1070   SCOPED_TSAN_INTERCEPTOR(pthread_mutex_init, m, a);
1071   int res = REAL(pthread_mutex_init)(m, a);
1072   if (res == 0) {
1073     bool recursive = false;
1074     if (a) {
1075       int type = 0;
1076       if (REAL(pthread_mutexattr_gettype)(a, &type) == 0)
1077         recursive = (type == PTHREAD_MUTEX_RECURSIVE
1078             || type == PTHREAD_MUTEX_RECURSIVE_NP);
1079     }
1080     MutexCreate(thr, pc, (uptr)m, false, recursive, false);
1081   }
1082   return res;
1083 }
1084
1085 TSAN_INTERCEPTOR(int, pthread_mutex_destroy, void *m) {
1086   SCOPED_TSAN_INTERCEPTOR(pthread_mutex_destroy, m);
1087   int res = REAL(pthread_mutex_destroy)(m);
1088   if (res == 0 || res == EBUSY) {
1089     MutexDestroy(thr, pc, (uptr)m);
1090   }
1091   return res;
1092 }
1093
1094 TSAN_INTERCEPTOR(int, pthread_mutex_trylock, void *m) {
1095   SCOPED_TSAN_INTERCEPTOR(pthread_mutex_trylock, m);
1096   int res = REAL(pthread_mutex_trylock)(m);
1097   if (res == EOWNERDEAD)
1098     MutexRepair(thr, pc, (uptr)m);
1099   if (res == 0 || res == EOWNERDEAD)
1100     MutexLock(thr, pc, (uptr)m, /*rec=*/1, /*try_lock=*/true);
1101   return res;
1102 }
1103
1104 TSAN_INTERCEPTOR(int, pthread_mutex_timedlock, void *m, void *abstime) {
1105   SCOPED_TSAN_INTERCEPTOR(pthread_mutex_timedlock, m, abstime);
1106   int res = REAL(pthread_mutex_timedlock)(m, abstime);
1107   if (res == 0) {
1108     MutexLock(thr, pc, (uptr)m);
1109   }
1110   return res;
1111 }
1112
1113 TSAN_INTERCEPTOR(int, pthread_spin_init, void *m, int pshared) {
1114   SCOPED_TSAN_INTERCEPTOR(pthread_spin_init, m, pshared);
1115   int res = REAL(pthread_spin_init)(m, pshared);
1116   if (res == 0) {
1117     MutexCreate(thr, pc, (uptr)m, false, false, false);
1118   }
1119   return res;
1120 }
1121
1122 TSAN_INTERCEPTOR(int, pthread_spin_destroy, void *m) {
1123   SCOPED_TSAN_INTERCEPTOR(pthread_spin_destroy, m);
1124   int res = REAL(pthread_spin_destroy)(m);
1125   if (res == 0) {
1126     MutexDestroy(thr, pc, (uptr)m);
1127   }
1128   return res;
1129 }
1130
1131 TSAN_INTERCEPTOR(int, pthread_spin_lock, void *m) {
1132   SCOPED_TSAN_INTERCEPTOR(pthread_spin_lock, m);
1133   int res = REAL(pthread_spin_lock)(m);
1134   if (res == 0) {
1135     MutexLock(thr, pc, (uptr)m);
1136   }
1137   return res;
1138 }
1139
1140 TSAN_INTERCEPTOR(int, pthread_spin_trylock, void *m) {
1141   SCOPED_TSAN_INTERCEPTOR(pthread_spin_trylock, m);
1142   int res = REAL(pthread_spin_trylock)(m);
1143   if (res == 0) {
1144     MutexLock(thr, pc, (uptr)m, /*rec=*/1, /*try_lock=*/true);
1145   }
1146   return res;
1147 }
1148
1149 TSAN_INTERCEPTOR(int, pthread_spin_unlock, void *m) {
1150   SCOPED_TSAN_INTERCEPTOR(pthread_spin_unlock, m);
1151   MutexUnlock(thr, pc, (uptr)m);
1152   int res = REAL(pthread_spin_unlock)(m);
1153   return res;
1154 }
1155
1156 TSAN_INTERCEPTOR(int, pthread_rwlock_init, void *m, void *a) {
1157   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_init, m, a);
1158   int res = REAL(pthread_rwlock_init)(m, a);
1159   if (res == 0) {
1160     MutexCreate(thr, pc, (uptr)m, true, false, false);
1161   }
1162   return res;
1163 }
1164
1165 TSAN_INTERCEPTOR(int, pthread_rwlock_destroy, void *m) {
1166   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_destroy, m);
1167   int res = REAL(pthread_rwlock_destroy)(m);
1168   if (res == 0) {
1169     MutexDestroy(thr, pc, (uptr)m);
1170   }
1171   return res;
1172 }
1173
1174 TSAN_INTERCEPTOR(int, pthread_rwlock_rdlock, void *m) {
1175   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_rdlock, m);
1176   int res = REAL(pthread_rwlock_rdlock)(m);
1177   if (res == 0) {
1178     MutexReadLock(thr, pc, (uptr)m);
1179   }
1180   return res;
1181 }
1182
1183 TSAN_INTERCEPTOR(int, pthread_rwlock_tryrdlock, void *m) {
1184   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_tryrdlock, m);
1185   int res = REAL(pthread_rwlock_tryrdlock)(m);
1186   if (res == 0) {
1187     MutexReadLock(thr, pc, (uptr)m, /*try_lock=*/true);
1188   }
1189   return res;
1190 }
1191
1192 TSAN_INTERCEPTOR(int, pthread_rwlock_timedrdlock, void *m, void *abstime) {
1193   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedrdlock, m, abstime);
1194   int res = REAL(pthread_rwlock_timedrdlock)(m, abstime);
1195   if (res == 0) {
1196     MutexReadLock(thr, pc, (uptr)m);
1197   }
1198   return res;
1199 }
1200
1201 TSAN_INTERCEPTOR(int, pthread_rwlock_wrlock, void *m) {
1202   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_wrlock, m);
1203   int res = REAL(pthread_rwlock_wrlock)(m);
1204   if (res == 0) {
1205     MutexLock(thr, pc, (uptr)m);
1206   }
1207   return res;
1208 }
1209
1210 TSAN_INTERCEPTOR(int, pthread_rwlock_trywrlock, void *m) {
1211   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_trywrlock, m);
1212   int res = REAL(pthread_rwlock_trywrlock)(m);
1213   if (res == 0) {
1214     MutexLock(thr, pc, (uptr)m, /*rec=*/1, /*try_lock=*/true);
1215   }
1216   return res;
1217 }
1218
1219 TSAN_INTERCEPTOR(int, pthread_rwlock_timedwrlock, void *m, void *abstime) {
1220   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedwrlock, m, abstime);
1221   int res = REAL(pthread_rwlock_timedwrlock)(m, abstime);
1222   if (res == 0) {
1223     MutexLock(thr, pc, (uptr)m);
1224   }
1225   return res;
1226 }
1227
1228 TSAN_INTERCEPTOR(int, pthread_rwlock_unlock, void *m) {
1229   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_unlock, m);
1230   MutexReadOrWriteUnlock(thr, pc, (uptr)m);
1231   int res = REAL(pthread_rwlock_unlock)(m);
1232   return res;
1233 }
1234
1235 TSAN_INTERCEPTOR(int, pthread_barrier_init, void *b, void *a, unsigned count) {
1236   SCOPED_TSAN_INTERCEPTOR(pthread_barrier_init, b, a, count);
1237   MemoryWrite(thr, pc, (uptr)b, kSizeLog1);
1238   int res = REAL(pthread_barrier_init)(b, a, count);
1239   return res;
1240 }
1241
1242 TSAN_INTERCEPTOR(int, pthread_barrier_destroy, void *b) {
1243   SCOPED_TSAN_INTERCEPTOR(pthread_barrier_destroy, b);
1244   MemoryWrite(thr, pc, (uptr)b, kSizeLog1);
1245   int res = REAL(pthread_barrier_destroy)(b);
1246   return res;
1247 }
1248
1249 TSAN_INTERCEPTOR(int, pthread_barrier_wait, void *b) {
1250   SCOPED_TSAN_INTERCEPTOR(pthread_barrier_wait, b);
1251   Release(thr, pc, (uptr)b);
1252   MemoryRead(thr, pc, (uptr)b, kSizeLog1);
1253   int res = REAL(pthread_barrier_wait)(b);
1254   MemoryRead(thr, pc, (uptr)b, kSizeLog1);
1255   if (res == 0 || res == PTHREAD_BARRIER_SERIAL_THREAD) {
1256     Acquire(thr, pc, (uptr)b);
1257   }
1258   return res;
1259 }
1260
1261 TSAN_INTERCEPTOR(int, pthread_once, void *o, void (*f)()) {
1262   SCOPED_INTERCEPTOR_RAW(pthread_once, o, f);
1263   if (o == 0 || f == 0)
1264     return EINVAL;
1265   atomic_uint32_t *a = static_cast<atomic_uint32_t*>(o);
1266   u32 v = atomic_load(a, memory_order_acquire);
1267   if (v == 0 && atomic_compare_exchange_strong(a, &v, 1,
1268                                                memory_order_relaxed)) {
1269     (*f)();
1270     if (!thr->in_ignored_lib)
1271       Release(thr, pc, (uptr)o);
1272     atomic_store(a, 2, memory_order_release);
1273   } else {
1274     while (v != 2) {
1275       pthread_yield();
1276       v = atomic_load(a, memory_order_acquire);
1277     }
1278     if (!thr->in_ignored_lib)
1279       Acquire(thr, pc, (uptr)o);
1280   }
1281   return 0;
1282 }
1283
1284 TSAN_INTERCEPTOR(int, sem_init, void *s, int pshared, unsigned value) {
1285   SCOPED_TSAN_INTERCEPTOR(sem_init, s, pshared, value);
1286   int res = REAL(sem_init)(s, pshared, value);
1287   return res;
1288 }
1289
1290 TSAN_INTERCEPTOR(int, sem_destroy, void *s) {
1291   SCOPED_TSAN_INTERCEPTOR(sem_destroy, s);
1292   int res = REAL(sem_destroy)(s);
1293   return res;
1294 }
1295
1296 TSAN_INTERCEPTOR(int, sem_wait, void *s) {
1297   SCOPED_TSAN_INTERCEPTOR(sem_wait, s);
1298   int res = BLOCK_REAL(sem_wait)(s);
1299   if (res == 0) {
1300     Acquire(thr, pc, (uptr)s);
1301   }
1302   return res;
1303 }
1304
1305 TSAN_INTERCEPTOR(int, sem_trywait, void *s) {
1306   SCOPED_TSAN_INTERCEPTOR(sem_trywait, s);
1307   int res = BLOCK_REAL(sem_trywait)(s);
1308   if (res == 0) {
1309     Acquire(thr, pc, (uptr)s);
1310   }
1311   return res;
1312 }
1313
1314 TSAN_INTERCEPTOR(int, sem_timedwait, void *s, void *abstime) {
1315   SCOPED_TSAN_INTERCEPTOR(sem_timedwait, s, abstime);
1316   int res = BLOCK_REAL(sem_timedwait)(s, abstime);
1317   if (res == 0) {
1318     Acquire(thr, pc, (uptr)s);
1319   }
1320   return res;
1321 }
1322
1323 TSAN_INTERCEPTOR(int, sem_post, void *s) {
1324   SCOPED_TSAN_INTERCEPTOR(sem_post, s);
1325   Release(thr, pc, (uptr)s);
1326   int res = REAL(sem_post)(s);
1327   return res;
1328 }
1329
1330 TSAN_INTERCEPTOR(int, sem_getvalue, void *s, int *sval) {
1331   SCOPED_TSAN_INTERCEPTOR(sem_getvalue, s, sval);
1332   int res = REAL(sem_getvalue)(s, sval);
1333   if (res == 0) {
1334     Acquire(thr, pc, (uptr)s);
1335   }
1336   return res;
1337 }
1338
1339 TSAN_INTERCEPTOR(int, __xstat, int version, const char *path, void *buf) {
1340   SCOPED_TSAN_INTERCEPTOR(__xstat, version, path, buf);
1341   return REAL(__xstat)(version, path, buf);
1342 }
1343
1344 TSAN_INTERCEPTOR(int, stat, const char *path, void *buf) {
1345   SCOPED_TSAN_INTERCEPTOR(__xstat, 0, path, buf);
1346   return REAL(__xstat)(0, path, buf);
1347 }
1348
1349 TSAN_INTERCEPTOR(int, __xstat64, int version, const char *path, void *buf) {
1350   SCOPED_TSAN_INTERCEPTOR(__xstat64, version, path, buf);
1351   return REAL(__xstat64)(version, path, buf);
1352 }
1353
1354 TSAN_INTERCEPTOR(int, stat64, const char *path, void *buf) {
1355   SCOPED_TSAN_INTERCEPTOR(__xstat64, 0, path, buf);
1356   return REAL(__xstat64)(0, path, buf);
1357 }
1358
1359 TSAN_INTERCEPTOR(int, __lxstat, int version, const char *path, void *buf) {
1360   SCOPED_TSAN_INTERCEPTOR(__lxstat, version, path, buf);
1361   return REAL(__lxstat)(version, path, buf);
1362 }
1363
1364 TSAN_INTERCEPTOR(int, lstat, const char *path, void *buf) {
1365   SCOPED_TSAN_INTERCEPTOR(__lxstat, 0, path, buf);
1366   return REAL(__lxstat)(0, path, buf);
1367 }
1368
1369 TSAN_INTERCEPTOR(int, __lxstat64, int version, const char *path, void *buf) {
1370   SCOPED_TSAN_INTERCEPTOR(__lxstat64, version, path, buf);
1371   return REAL(__lxstat64)(version, path, buf);
1372 }
1373
1374 TSAN_INTERCEPTOR(int, lstat64, const char *path, void *buf) {
1375   SCOPED_TSAN_INTERCEPTOR(__lxstat64, 0, path, buf);
1376   return REAL(__lxstat64)(0, path, buf);
1377 }
1378
1379 TSAN_INTERCEPTOR(int, __fxstat, int version, int fd, void *buf) {
1380   SCOPED_TSAN_INTERCEPTOR(__fxstat, version, fd, buf);
1381   if (fd > 0)
1382     FdAccess(thr, pc, fd);
1383   return REAL(__fxstat)(version, fd, buf);
1384 }
1385
1386 TSAN_INTERCEPTOR(int, fstat, int fd, void *buf) {
1387   SCOPED_TSAN_INTERCEPTOR(__fxstat, 0, fd, buf);
1388   if (fd > 0)
1389     FdAccess(thr, pc, fd);
1390   return REAL(__fxstat)(0, fd, buf);
1391 }
1392
1393 TSAN_INTERCEPTOR(int, __fxstat64, int version, int fd, void *buf) {
1394   SCOPED_TSAN_INTERCEPTOR(__fxstat64, version, fd, buf);
1395   if (fd > 0)
1396     FdAccess(thr, pc, fd);
1397   return REAL(__fxstat64)(version, fd, buf);
1398 }
1399
1400 TSAN_INTERCEPTOR(int, fstat64, int fd, void *buf) {
1401   SCOPED_TSAN_INTERCEPTOR(__fxstat64, 0, fd, buf);
1402   if (fd > 0)
1403     FdAccess(thr, pc, fd);
1404   return REAL(__fxstat64)(0, fd, buf);
1405 }
1406
1407 TSAN_INTERCEPTOR(int, open, const char *name, int flags, int mode) {
1408   SCOPED_TSAN_INTERCEPTOR(open, name, flags, mode);
1409   int fd = REAL(open)(name, flags, mode);
1410   if (fd >= 0)
1411     FdFileCreate(thr, pc, fd);
1412   return fd;
1413 }
1414
1415 TSAN_INTERCEPTOR(int, open64, const char *name, int flags, int mode) {
1416   SCOPED_TSAN_INTERCEPTOR(open64, name, flags, mode);
1417   int fd = REAL(open64)(name, flags, mode);
1418   if (fd >= 0)
1419     FdFileCreate(thr, pc, fd);
1420   return fd;
1421 }
1422
1423 TSAN_INTERCEPTOR(int, creat, const char *name, int mode) {
1424   SCOPED_TSAN_INTERCEPTOR(creat, name, mode);
1425   int fd = REAL(creat)(name, mode);
1426   if (fd >= 0)
1427     FdFileCreate(thr, pc, fd);
1428   return fd;
1429 }
1430
1431 TSAN_INTERCEPTOR(int, creat64, const char *name, int mode) {
1432   SCOPED_TSAN_INTERCEPTOR(creat64, name, mode);
1433   int fd = REAL(creat64)(name, mode);
1434   if (fd >= 0)
1435     FdFileCreate(thr, pc, fd);
1436   return fd;
1437 }
1438
1439 TSAN_INTERCEPTOR(int, dup, int oldfd) {
1440   SCOPED_TSAN_INTERCEPTOR(dup, oldfd);
1441   int newfd = REAL(dup)(oldfd);
1442   if (oldfd >= 0 && newfd >= 0 && newfd != oldfd)
1443     FdDup(thr, pc, oldfd, newfd);
1444   return newfd;
1445 }
1446
1447 TSAN_INTERCEPTOR(int, dup2, int oldfd, int newfd) {
1448   SCOPED_TSAN_INTERCEPTOR(dup2, oldfd, newfd);
1449   int newfd2 = REAL(dup2)(oldfd, newfd);
1450   if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
1451     FdDup(thr, pc, oldfd, newfd2);
1452   return newfd2;
1453 }
1454
1455 TSAN_INTERCEPTOR(int, dup3, int oldfd, int newfd, int flags) {
1456   SCOPED_TSAN_INTERCEPTOR(dup3, oldfd, newfd, flags);
1457   int newfd2 = REAL(dup3)(oldfd, newfd, flags);
1458   if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
1459     FdDup(thr, pc, oldfd, newfd2);
1460   return newfd2;
1461 }
1462
1463 TSAN_INTERCEPTOR(int, eventfd, unsigned initval, int flags) {
1464   SCOPED_TSAN_INTERCEPTOR(eventfd, initval, flags);
1465   int fd = REAL(eventfd)(initval, flags);
1466   if (fd >= 0)
1467     FdEventCreate(thr, pc, fd);
1468   return fd;
1469 }
1470
1471 TSAN_INTERCEPTOR(int, signalfd, int fd, void *mask, int flags) {
1472   SCOPED_TSAN_INTERCEPTOR(signalfd, fd, mask, flags);
1473   if (fd >= 0)
1474     FdClose(thr, pc, fd);
1475   fd = REAL(signalfd)(fd, mask, flags);
1476   if (fd >= 0)
1477     FdSignalCreate(thr, pc, fd);
1478   return fd;
1479 }
1480
1481 TSAN_INTERCEPTOR(int, inotify_init, int fake) {
1482   SCOPED_TSAN_INTERCEPTOR(inotify_init, fake);
1483   int fd = REAL(inotify_init)(fake);
1484   if (fd >= 0)
1485     FdInotifyCreate(thr, pc, fd);
1486   return fd;
1487 }
1488
1489 TSAN_INTERCEPTOR(int, inotify_init1, int flags) {
1490   SCOPED_TSAN_INTERCEPTOR(inotify_init1, flags);
1491   int fd = REAL(inotify_init1)(flags);
1492   if (fd >= 0)
1493     FdInotifyCreate(thr, pc, fd);
1494   return fd;
1495 }
1496
1497 TSAN_INTERCEPTOR(int, socket, int domain, int type, int protocol) {
1498   SCOPED_TSAN_INTERCEPTOR(socket, domain, type, protocol);
1499   int fd = REAL(socket)(domain, type, protocol);
1500   if (fd >= 0)
1501     FdSocketCreate(thr, pc, fd);
1502   return fd;
1503 }
1504
1505 TSAN_INTERCEPTOR(int, socketpair, int domain, int type, int protocol, int *fd) {
1506   SCOPED_TSAN_INTERCEPTOR(socketpair, domain, type, protocol, fd);
1507   int res = REAL(socketpair)(domain, type, protocol, fd);
1508   if (res == 0 && fd[0] >= 0 && fd[1] >= 0)
1509     FdPipeCreate(thr, pc, fd[0], fd[1]);
1510   return res;
1511 }
1512
1513 TSAN_INTERCEPTOR(int, connect, int fd, void *addr, unsigned addrlen) {
1514   SCOPED_TSAN_INTERCEPTOR(connect, fd, addr, addrlen);
1515   FdSocketConnecting(thr, pc, fd);
1516   int res = REAL(connect)(fd, addr, addrlen);
1517   if (res == 0 && fd >= 0)
1518     FdSocketConnect(thr, pc, fd);
1519   return res;
1520 }
1521
1522 TSAN_INTERCEPTOR(int, bind, int fd, void *addr, unsigned addrlen) {
1523   SCOPED_TSAN_INTERCEPTOR(bind, fd, addr, addrlen);
1524   int res = REAL(bind)(fd, addr, addrlen);
1525   if (fd > 0 && res == 0)
1526     FdAccess(thr, pc, fd);
1527   return res;
1528 }
1529
1530 TSAN_INTERCEPTOR(int, listen, int fd, int backlog) {
1531   SCOPED_TSAN_INTERCEPTOR(listen, fd, backlog);
1532   int res = REAL(listen)(fd, backlog);
1533   if (fd > 0 && res == 0)
1534     FdAccess(thr, pc, fd);
1535   return res;
1536 }
1537
1538 TSAN_INTERCEPTOR(int, epoll_create, int size) {
1539   SCOPED_TSAN_INTERCEPTOR(epoll_create, size);
1540   int fd = REAL(epoll_create)(size);
1541   if (fd >= 0)
1542     FdPollCreate(thr, pc, fd);
1543   return fd;
1544 }
1545
1546 TSAN_INTERCEPTOR(int, epoll_create1, int flags) {
1547   SCOPED_TSAN_INTERCEPTOR(epoll_create1, flags);
1548   int fd = REAL(epoll_create1)(flags);
1549   if (fd >= 0)
1550     FdPollCreate(thr, pc, fd);
1551   return fd;
1552 }
1553
1554 TSAN_INTERCEPTOR(int, close, int fd) {
1555   SCOPED_TSAN_INTERCEPTOR(close, fd);
1556   if (fd >= 0)
1557     FdClose(thr, pc, fd);
1558   return REAL(close)(fd);
1559 }
1560
1561 TSAN_INTERCEPTOR(int, __close, int fd) {
1562   SCOPED_TSAN_INTERCEPTOR(__close, fd);
1563   if (fd >= 0)
1564     FdClose(thr, pc, fd);
1565   return REAL(__close)(fd);
1566 }
1567
1568 // glibc guts
1569 TSAN_INTERCEPTOR(void, __res_iclose, void *state, bool free_addr) {
1570   SCOPED_TSAN_INTERCEPTOR(__res_iclose, state, free_addr);
1571   int fds[64];
1572   int cnt = ExtractResolvFDs(state, fds, ARRAY_SIZE(fds));
1573   for (int i = 0; i < cnt; i++) {
1574     if (fds[i] > 0)
1575       FdClose(thr, pc, fds[i]);
1576   }
1577   REAL(__res_iclose)(state, free_addr);
1578 }
1579
1580 TSAN_INTERCEPTOR(int, pipe, int *pipefd) {
1581   SCOPED_TSAN_INTERCEPTOR(pipe, pipefd);
1582   int res = REAL(pipe)(pipefd);
1583   if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
1584     FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
1585   return res;
1586 }
1587
1588 TSAN_INTERCEPTOR(int, pipe2, int *pipefd, int flags) {
1589   SCOPED_TSAN_INTERCEPTOR(pipe2, pipefd, flags);
1590   int res = REAL(pipe2)(pipefd, flags);
1591   if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
1592     FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
1593   return res;
1594 }
1595
1596 TSAN_INTERCEPTOR(long_t, send, int fd, void *buf, long_t len, int flags) {
1597   SCOPED_TSAN_INTERCEPTOR(send, fd, buf, len, flags);
1598   if (fd >= 0) {
1599     FdAccess(thr, pc, fd);
1600     FdRelease(thr, pc, fd);
1601   }
1602   int res = REAL(send)(fd, buf, len, flags);
1603   return res;
1604 }
1605
1606 TSAN_INTERCEPTOR(long_t, sendmsg, int fd, void *msg, int flags) {
1607   SCOPED_TSAN_INTERCEPTOR(sendmsg, fd, msg, flags);
1608   if (fd >= 0) {
1609     FdAccess(thr, pc, fd);
1610     FdRelease(thr, pc, fd);
1611   }
1612   int res = REAL(sendmsg)(fd, msg, flags);
1613   return res;
1614 }
1615
1616 TSAN_INTERCEPTOR(long_t, recv, int fd, void *buf, long_t len, int flags) {
1617   SCOPED_TSAN_INTERCEPTOR(recv, fd, buf, len, flags);
1618   if (fd >= 0)
1619     FdAccess(thr, pc, fd);
1620   int res = REAL(recv)(fd, buf, len, flags);
1621   if (res >= 0 && fd >= 0) {
1622     FdAcquire(thr, pc, fd);
1623   }
1624   return res;
1625 }
1626
1627 TSAN_INTERCEPTOR(int, unlink, char *path) {
1628   SCOPED_TSAN_INTERCEPTOR(unlink, path);
1629   Release(thr, pc, File2addr(path));
1630   int res = REAL(unlink)(path);
1631   return res;
1632 }
1633
1634 TSAN_INTERCEPTOR(void*, tmpfile, int fake) {
1635   SCOPED_TSAN_INTERCEPTOR(tmpfile, fake);
1636   void *res = REAL(tmpfile)(fake);
1637   if (res) {
1638     int fd = fileno_unlocked(res);
1639     if (fd >= 0)
1640       FdFileCreate(thr, pc, fd);
1641   }
1642   return res;
1643 }
1644
1645 TSAN_INTERCEPTOR(void*, tmpfile64, int fake) {
1646   SCOPED_TSAN_INTERCEPTOR(tmpfile64, fake);
1647   void *res = REAL(tmpfile64)(fake);
1648   if (res) {
1649     int fd = fileno_unlocked(res);
1650     if (fd >= 0)
1651       FdFileCreate(thr, pc, fd);
1652   }
1653   return res;
1654 }
1655
1656 TSAN_INTERCEPTOR(uptr, fread, void *ptr, uptr size, uptr nmemb, void *f) {
1657   // libc file streams can call user-supplied functions, see fopencookie.
1658   {
1659     SCOPED_TSAN_INTERCEPTOR(fread, ptr, size, nmemb, f);
1660     MemoryAccessRange(thr, pc, (uptr)ptr, size * nmemb, true);
1661   }
1662   return REAL(fread)(ptr, size, nmemb, f);
1663 }
1664
1665 TSAN_INTERCEPTOR(uptr, fwrite, const void *p, uptr size, uptr nmemb, void *f) {
1666   // libc file streams can call user-supplied functions, see fopencookie.
1667   {
1668     SCOPED_TSAN_INTERCEPTOR(fwrite, p, size, nmemb, f);
1669     MemoryAccessRange(thr, pc, (uptr)p, size * nmemb, false);
1670   }
1671   return REAL(fwrite)(p, size, nmemb, f);
1672 }
1673
1674 TSAN_INTERCEPTOR(void, abort, int fake) {
1675   SCOPED_TSAN_INTERCEPTOR(abort, fake);
1676   REAL(fflush)(0);
1677   REAL(abort)(fake);
1678 }
1679
1680 TSAN_INTERCEPTOR(int, puts, const char *s) {
1681   SCOPED_TSAN_INTERCEPTOR(puts, s);
1682   MemoryAccessRange(thr, pc, (uptr)s, internal_strlen(s), false);
1683   return REAL(puts)(s);
1684 }
1685
1686 TSAN_INTERCEPTOR(int, rmdir, char *path) {
1687   SCOPED_TSAN_INTERCEPTOR(rmdir, path);
1688   Release(thr, pc, Dir2addr(path));
1689   int res = REAL(rmdir)(path);
1690   return res;
1691 }
1692
1693 TSAN_INTERCEPTOR(void*, opendir, char *path) {
1694   SCOPED_TSAN_INTERCEPTOR(opendir, path);
1695   void *res = REAL(opendir)(path);
1696   if (res != 0)
1697     Acquire(thr, pc, Dir2addr(path));
1698   return res;
1699 }
1700
1701 TSAN_INTERCEPTOR(int, epoll_ctl, int epfd, int op, int fd, void *ev) {
1702   SCOPED_TSAN_INTERCEPTOR(epoll_ctl, epfd, op, fd, ev);
1703   if (epfd >= 0)
1704     FdAccess(thr, pc, epfd);
1705   if (epfd >= 0 && fd >= 0)
1706     FdAccess(thr, pc, fd);
1707   if (op == EPOLL_CTL_ADD && epfd >= 0)
1708     FdRelease(thr, pc, epfd);
1709   int res = REAL(epoll_ctl)(epfd, op, fd, ev);
1710   return res;
1711 }
1712
1713 TSAN_INTERCEPTOR(int, epoll_wait, int epfd, void *ev, int cnt, int timeout) {
1714   SCOPED_TSAN_INTERCEPTOR(epoll_wait, epfd, ev, cnt, timeout);
1715   if (epfd >= 0)
1716     FdAccess(thr, pc, epfd);
1717   int res = BLOCK_REAL(epoll_wait)(epfd, ev, cnt, timeout);
1718   if (res > 0 && epfd >= 0)
1719     FdAcquire(thr, pc, epfd);
1720   return res;
1721 }
1722
1723 namespace __tsan {
1724
1725 static void CallUserSignalHandler(ThreadState *thr, bool sync, bool acquire,
1726     bool sigact, int sig, my_siginfo_t *info, void *uctx) {
1727   if (acquire)
1728     Acquire(thr, 0, (uptr)&sigactions[sig]);
1729   // Ensure that the handler does not spoil errno.
1730   const int saved_errno = errno;
1731   errno = 99;
1732   // Need to remember pc before the call, because the handler can reset it.
1733   uptr pc = sigact ?
1734      (uptr)sigactions[sig].sa_sigaction :
1735      (uptr)sigactions[sig].sa_handler;
1736   pc += 1;  // return address is expected, OutputReport() will undo this
1737   if (sigact)
1738     sigactions[sig].sa_sigaction(sig, info, uctx);
1739   else
1740     sigactions[sig].sa_handler(sig);
1741   // We do not detect errno spoiling for SIGTERM,
1742   // because some SIGTERM handlers do spoil errno but reraise SIGTERM,
1743   // tsan reports false positive in such case.
1744   // It's difficult to properly detect this situation (reraise),
1745   // because in async signal processing case (when handler is called directly
1746   // from rtl_generic_sighandler) we have not yet received the reraised
1747   // signal; and it looks too fragile to intercept all ways to reraise a signal.
1748   if (flags()->report_bugs && !sync && sig != SIGTERM && errno != 99) {
1749     __tsan::StackTrace stack;
1750     stack.ObtainCurrent(thr, pc);
1751     ThreadRegistryLock l(ctx->thread_registry);
1752     ScopedReport rep(ReportTypeErrnoInSignal);
1753     if (!IsFiredSuppression(ctx, rep, stack)) {
1754       rep.AddStack(&stack, true);
1755       OutputReport(thr, rep);
1756     }
1757   }
1758   errno = saved_errno;
1759 }
1760
1761 void ProcessPendingSignals(ThreadState *thr) {
1762   SignalContext *sctx = SigCtx(thr);
1763   if (sctx == 0 ||
1764       atomic_load(&sctx->have_pending_signals, memory_order_relaxed) == 0)
1765     return;
1766   atomic_store(&sctx->have_pending_signals, 0, memory_order_relaxed);
1767   atomic_fetch_add(&thr->in_signal_handler, 1, memory_order_relaxed);
1768   // These are too big for stack.
1769   static THREADLOCAL __sanitizer_sigset_t emptyset, oldset;
1770   REAL(sigfillset)(&emptyset);
1771   pthread_sigmask(SIG_SETMASK, &emptyset, &oldset);
1772   for (int sig = 0; sig < kSigCount; sig++) {
1773     SignalDesc *signal = &sctx->pending_signals[sig];
1774     if (signal->armed) {
1775       signal->armed = false;
1776       if (sigactions[sig].sa_handler != SIG_DFL
1777           && sigactions[sig].sa_handler != SIG_IGN) {
1778         CallUserSignalHandler(thr, false, true, signal->sigaction,
1779             sig, &signal->siginfo, &signal->ctx);
1780       }
1781     }
1782   }
1783   pthread_sigmask(SIG_SETMASK, &oldset, 0);
1784   atomic_fetch_add(&thr->in_signal_handler, -1, memory_order_relaxed);
1785 }
1786
1787 }  // namespace __tsan
1788
1789 static bool is_sync_signal(SignalContext *sctx, int sig) {
1790   return sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
1791       sig == SIGABRT || sig == SIGFPE || sig == SIGPIPE || sig == SIGSYS ||
1792       // If we are sending signal to ourselves, we must process it now.
1793       (sctx && sig == sctx->int_signal_send);
1794 }
1795
1796 void ALWAYS_INLINE rtl_generic_sighandler(bool sigact, int sig,
1797     my_siginfo_t *info, void *ctx) {
1798   ThreadState *thr = cur_thread();
1799   SignalContext *sctx = SigCtx(thr);
1800   if (sig < 0 || sig >= kSigCount) {
1801     VPrintf(1, "ThreadSanitizer: ignoring signal %d\n", sig);
1802     return;
1803   }
1804   // Don't mess with synchronous signals.
1805   const bool sync = is_sync_signal(sctx, sig);
1806   if (sync ||
1807       // If we are in blocking function, we can safely process it now
1808       // (but check if we are in a recursive interceptor,
1809       // i.e. pthread_join()->munmap()).
1810       (sctx && atomic_load(&sctx->in_blocking_func, memory_order_relaxed))) {
1811     atomic_fetch_add(&thr->in_signal_handler, 1, memory_order_relaxed);
1812     if (sctx && atomic_load(&sctx->in_blocking_func, memory_order_relaxed)) {
1813       // We ignore interceptors in blocking functions,
1814       // temporary enbled them again while we are calling user function.
1815       int const i = thr->ignore_interceptors;
1816       thr->ignore_interceptors = 0;
1817       atomic_store(&sctx->in_blocking_func, 0, memory_order_relaxed);
1818       CallUserSignalHandler(thr, sync, true, sigact, sig, info, ctx);
1819       thr->ignore_interceptors = i;
1820       atomic_store(&sctx->in_blocking_func, 1, memory_order_relaxed);
1821     } else {
1822       // Be very conservative with when we do acquire in this case.
1823       // It's unsafe to do acquire in async handlers, because ThreadState
1824       // can be in inconsistent state.
1825       // SIGSYS looks relatively safe -- it's synchronous and can actually
1826       // need some global state.
1827       bool acq = (sig == SIGSYS);
1828       CallUserSignalHandler(thr, sync, acq, sigact, sig, info, ctx);
1829     }
1830     atomic_fetch_add(&thr->in_signal_handler, -1, memory_order_relaxed);
1831     return;
1832   }
1833
1834   if (sctx == 0)
1835     return;
1836   SignalDesc *signal = &sctx->pending_signals[sig];
1837   if (signal->armed == false) {
1838     signal->armed = true;
1839     signal->sigaction = sigact;
1840     if (info)
1841       internal_memcpy(&signal->siginfo, info, sizeof(*info));
1842     if (ctx)
1843       internal_memcpy(&signal->ctx, ctx, sizeof(signal->ctx));
1844     atomic_store(&sctx->have_pending_signals, 1, memory_order_relaxed);
1845   }
1846 }
1847
1848 static void rtl_sighandler(int sig) {
1849   rtl_generic_sighandler(false, sig, 0, 0);
1850 }
1851
1852 static void rtl_sigaction(int sig, my_siginfo_t *info, void *ctx) {
1853   rtl_generic_sighandler(true, sig, info, ctx);
1854 }
1855
1856 TSAN_INTERCEPTOR(int, sigaction, int sig, sigaction_t *act, sigaction_t *old) {
1857   SCOPED_TSAN_INTERCEPTOR(sigaction, sig, act, old);
1858   if (old)
1859     internal_memcpy(old, &sigactions[sig], sizeof(*old));
1860   if (act == 0)
1861     return 0;
1862   internal_memcpy(&sigactions[sig], act, sizeof(*act));
1863   sigaction_t newact;
1864   internal_memcpy(&newact, act, sizeof(newact));
1865   REAL(sigfillset)(&newact.sa_mask);
1866   if (act->sa_handler != SIG_IGN && act->sa_handler != SIG_DFL) {
1867     if (newact.sa_flags & SA_SIGINFO)
1868       newact.sa_sigaction = rtl_sigaction;
1869     else
1870       newact.sa_handler = rtl_sighandler;
1871   }
1872   ReleaseStore(thr, pc, (uptr)&sigactions[sig]);
1873   int res = REAL(sigaction)(sig, &newact, 0);
1874   return res;
1875 }
1876
1877 TSAN_INTERCEPTOR(sighandler_t, signal, int sig, sighandler_t h) {
1878   sigaction_t act;
1879   act.sa_handler = h;
1880   REAL(memset)(&act.sa_mask, -1, sizeof(act.sa_mask));
1881   act.sa_flags = 0;
1882   sigaction_t old;
1883   int res = sigaction(sig, &act, &old);
1884   if (res)
1885     return SIG_ERR;
1886   return old.sa_handler;
1887 }
1888
1889 TSAN_INTERCEPTOR(int, sigsuspend, const __sanitizer_sigset_t *mask) {
1890   SCOPED_TSAN_INTERCEPTOR(sigsuspend, mask);
1891   return REAL(sigsuspend)(mask);
1892 }
1893
1894 TSAN_INTERCEPTOR(int, raise, int sig) {
1895   SCOPED_TSAN_INTERCEPTOR(raise, sig);
1896   SignalContext *sctx = SigCtx(thr);
1897   CHECK_NE(sctx, 0);
1898   int prev = sctx->int_signal_send;
1899   sctx->int_signal_send = sig;
1900   int res = REAL(raise)(sig);
1901   CHECK_EQ(sctx->int_signal_send, sig);
1902   sctx->int_signal_send = prev;
1903   return res;
1904 }
1905
1906 TSAN_INTERCEPTOR(int, kill, int pid, int sig) {
1907   SCOPED_TSAN_INTERCEPTOR(kill, pid, sig);
1908   SignalContext *sctx = SigCtx(thr);
1909   CHECK_NE(sctx, 0);
1910   int prev = sctx->int_signal_send;
1911   if (pid == (int)internal_getpid()) {
1912     sctx->int_signal_send = sig;
1913   }
1914   int res = REAL(kill)(pid, sig);
1915   if (pid == (int)internal_getpid()) {
1916     CHECK_EQ(sctx->int_signal_send, sig);
1917     sctx->int_signal_send = prev;
1918   }
1919   return res;
1920 }
1921
1922 TSAN_INTERCEPTOR(int, pthread_kill, void *tid, int sig) {
1923   SCOPED_TSAN_INTERCEPTOR(pthread_kill, tid, sig);
1924   SignalContext *sctx = SigCtx(thr);
1925   CHECK_NE(sctx, 0);
1926   int prev = sctx->int_signal_send;
1927   if (tid == pthread_self()) {
1928     sctx->int_signal_send = sig;
1929   }
1930   int res = REAL(pthread_kill)(tid, sig);
1931   if (tid == pthread_self()) {
1932     CHECK_EQ(sctx->int_signal_send, sig);
1933     sctx->int_signal_send = prev;
1934   }
1935   return res;
1936 }
1937
1938 TSAN_INTERCEPTOR(int, gettimeofday, void *tv, void *tz) {
1939   SCOPED_TSAN_INTERCEPTOR(gettimeofday, tv, tz);
1940   // It's intercepted merely to process pending signals.
1941   return REAL(gettimeofday)(tv, tz);
1942 }
1943
1944 TSAN_INTERCEPTOR(int, getaddrinfo, void *node, void *service,
1945     void *hints, void *rv) {
1946   SCOPED_TSAN_INTERCEPTOR(getaddrinfo, node, service, hints, rv);
1947   // We miss atomic synchronization in getaddrinfo,
1948   // and can report false race between malloc and free
1949   // inside of getaddrinfo. So ignore memory accesses.
1950   ThreadIgnoreBegin(thr, pc);
1951   int res = REAL(getaddrinfo)(node, service, hints, rv);
1952   ThreadIgnoreEnd(thr, pc);
1953   return res;
1954 }
1955
1956 TSAN_INTERCEPTOR(int, fork, int fake) {
1957   if (cur_thread()->in_symbolizer)
1958     return REAL(fork)(fake);
1959   SCOPED_INTERCEPTOR_RAW(fork, fake);
1960   ForkBefore(thr, pc);
1961   int pid = REAL(fork)(fake);
1962   if (pid == 0) {
1963     // child
1964     ForkChildAfter(thr, pc);
1965     FdOnFork(thr, pc);
1966   } else if (pid > 0) {
1967     // parent
1968     ForkParentAfter(thr, pc);
1969   } else {
1970     // error
1971     ForkParentAfter(thr, pc);
1972   }
1973   return pid;
1974 }
1975
1976 TSAN_INTERCEPTOR(int, vfork, int fake) {
1977   // Some programs (e.g. openjdk) call close for all file descriptors
1978   // in the child process. Under tsan it leads to false positives, because
1979   // address space is shared, so the parent process also thinks that
1980   // the descriptors are closed (while they are actually not).
1981   // This leads to false positives due to missed synchronization.
1982   // Strictly saying this is undefined behavior, because vfork child is not
1983   // allowed to call any functions other than exec/exit. But this is what
1984   // openjdk does, so we want to handle it.
1985   // We could disable interceptors in the child process. But it's not possible
1986   // to simply intercept and wrap vfork, because vfork child is not allowed
1987   // to return from the function that calls vfork, and that's exactly what
1988   // we would do. So this would require some assembly trickery as well.
1989   // Instead we simply turn vfork into fork.
1990   return WRAP(fork)(fake);
1991 }
1992
1993 static int OnExit(ThreadState *thr) {
1994   int status = Finalize(thr);
1995   REAL(fflush)(0);
1996   return status;
1997 }
1998
1999 struct TsanInterceptorContext {
2000   ThreadState *thr;
2001   const uptr caller_pc;
2002   const uptr pc;
2003 };
2004
2005 static void HandleRecvmsg(ThreadState *thr, uptr pc,
2006     __sanitizer_msghdr *msg) {
2007   int fds[64];
2008   int cnt = ExtractRecvmsgFDs(msg, fds, ARRAY_SIZE(fds));
2009   for (int i = 0; i < cnt; i++)
2010     FdEventCreate(thr, pc, fds[i]);
2011 }
2012
2013 #include "sanitizer_common/sanitizer_platform_interceptors.h"
2014 // Causes interceptor recursion (getaddrinfo() and fopen())
2015 #undef SANITIZER_INTERCEPT_GETADDRINFO
2016 // There interceptors do not seem to be strictly necessary for tsan.
2017 // But we see cases where the interceptors consume 70% of execution time.
2018 // Memory blocks passed to fgetgrent_r are "written to" by tsan several times.
2019 // First, there is some recursion (getgrnam_r calls fgetgrent_r), and each
2020 // function "writes to" the buffer. Then, the same memory is "written to"
2021 // twice, first as buf and then as pwbufp (both of them refer to the same
2022 // addresses).
2023 #undef SANITIZER_INTERCEPT_GETPWENT
2024 #undef SANITIZER_INTERCEPT_GETPWENT_R
2025 #undef SANITIZER_INTERCEPT_FGETPWENT
2026 #undef SANITIZER_INTERCEPT_GETPWNAM_AND_FRIENDS
2027 #undef SANITIZER_INTERCEPT_GETPWNAM_R_AND_FRIENDS
2028
2029 #define COMMON_INTERCEPT_FUNCTION(name) INTERCEPT_FUNCTION(name)
2030
2031 #define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size)                    \
2032   MemoryAccessRange(((TsanInterceptorContext *)ctx)->thr,                 \
2033                     ((TsanInterceptorContext *)ctx)->pc, (uptr)ptr, size, \
2034                     true)
2035
2036 #define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size)                       \
2037   MemoryAccessRange(((TsanInterceptorContext *) ctx)->thr,                  \
2038                     ((TsanInterceptorContext *) ctx)->pc, (uptr) ptr, size, \
2039                     false)
2040
2041 #define COMMON_INTERCEPTOR_ENTER(ctx, func, ...)      \
2042   SCOPED_TSAN_INTERCEPTOR(func, __VA_ARGS__);         \
2043   TsanInterceptorContext _ctx = {thr, caller_pc, pc}; \
2044   ctx = (void *)&_ctx;                                \
2045   (void) ctx;
2046
2047 #define COMMON_INTERCEPTOR_ENTER_NOIGNORE(ctx, func, ...) \
2048   SCOPED_INTERCEPTOR_RAW(func, __VA_ARGS__);              \
2049   TsanInterceptorContext _ctx = {thr, caller_pc, pc};     \
2050   ctx = (void *)&_ctx;                                    \
2051   (void) ctx;
2052
2053 #define COMMON_INTERCEPTOR_FILE_OPEN(ctx, file, path) \
2054   Acquire(thr, pc, File2addr(path));                  \
2055   if (file) {                                         \
2056     int fd = fileno_unlocked(file);                   \
2057     if (fd >= 0) FdFileCreate(thr, pc, fd);           \
2058   }
2059
2060 #define COMMON_INTERCEPTOR_FILE_CLOSE(ctx, file) \
2061   if (file) {                                    \
2062     int fd = fileno_unlocked(file);              \
2063     if (fd >= 0) FdClose(thr, pc, fd);           \
2064   }
2065
2066 #define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, res)  \
2067   libignore()->OnLibraryLoaded(filename)
2068
2069 #define COMMON_INTERCEPTOR_LIBRARY_UNLOADED() \
2070   libignore()->OnLibraryUnloaded()
2071
2072 #define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \
2073   FdAcquire(((TsanInterceptorContext *) ctx)->thr, pc, fd)
2074
2075 #define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \
2076   FdRelease(((TsanInterceptorContext *) ctx)->thr, pc, fd)
2077
2078 #define COMMON_INTERCEPTOR_FD_ACCESS(ctx, fd) \
2079   FdAccess(((TsanInterceptorContext *) ctx)->thr, pc, fd)
2080
2081 #define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd) \
2082   FdSocketAccept(((TsanInterceptorContext *) ctx)->thr, pc, fd, newfd)
2083
2084 #define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) \
2085   ThreadSetName(((TsanInterceptorContext *) ctx)->thr, name)
2086
2087 #define COMMON_INTERCEPTOR_SET_PTHREAD_NAME(ctx, thread, name) \
2088   __tsan::ctx->thread_registry->SetThreadNameByUserId(thread, name)
2089
2090 #define COMMON_INTERCEPTOR_BLOCK_REAL(name) BLOCK_REAL(name)
2091
2092 #define COMMON_INTERCEPTOR_ON_EXIT(ctx) \
2093   OnExit(((TsanInterceptorContext *) ctx)->thr)
2094
2095 #define COMMON_INTERCEPTOR_MUTEX_LOCK(ctx, m) \
2096   MutexLock(((TsanInterceptorContext *)ctx)->thr, \
2097             ((TsanInterceptorContext *)ctx)->pc, (uptr)m)
2098
2099 #define COMMON_INTERCEPTOR_MUTEX_UNLOCK(ctx, m) \
2100   MutexUnlock(((TsanInterceptorContext *)ctx)->thr, \
2101             ((TsanInterceptorContext *)ctx)->pc, (uptr)m)
2102
2103 #define COMMON_INTERCEPTOR_MUTEX_REPAIR(ctx, m) \
2104   MutexRepair(((TsanInterceptorContext *)ctx)->thr, \
2105             ((TsanInterceptorContext *)ctx)->pc, (uptr)m)
2106
2107 #define COMMON_INTERCEPTOR_HANDLE_RECVMSG(ctx, msg) \
2108   HandleRecvmsg(((TsanInterceptorContext *)ctx)->thr, \
2109       ((TsanInterceptorContext *)ctx)->pc, msg)
2110
2111 #include "sanitizer_common/sanitizer_common_interceptors.inc"
2112
2113 #define TSAN_SYSCALL() \
2114   ThreadState *thr = cur_thread(); \
2115   if (thr->ignore_interceptors) \
2116     return; \
2117   ScopedSyscall scoped_syscall(thr) \
2118 /**/
2119
2120 struct ScopedSyscall {
2121   ThreadState *thr;
2122
2123   explicit ScopedSyscall(ThreadState *thr)
2124       : thr(thr) {
2125     Initialize(thr);
2126   }
2127
2128   ~ScopedSyscall() {
2129     ProcessPendingSignals(thr);
2130   }
2131 };
2132
2133 static void syscall_access_range(uptr pc, uptr p, uptr s, bool write) {
2134   TSAN_SYSCALL();
2135   MemoryAccessRange(thr, pc, p, s, write);
2136 }
2137
2138 static void syscall_acquire(uptr pc, uptr addr) {
2139   TSAN_SYSCALL();
2140   Acquire(thr, pc, addr);
2141   DPrintf("syscall_acquire(%p)\n", addr);
2142 }
2143
2144 static void syscall_release(uptr pc, uptr addr) {
2145   TSAN_SYSCALL();
2146   DPrintf("syscall_release(%p)\n", addr);
2147   Release(thr, pc, addr);
2148 }
2149
2150 static void syscall_fd_close(uptr pc, int fd) {
2151   TSAN_SYSCALL();
2152   FdClose(thr, pc, fd);
2153 }
2154
2155 static USED void syscall_fd_acquire(uptr pc, int fd) {
2156   TSAN_SYSCALL();
2157   FdAcquire(thr, pc, fd);
2158   DPrintf("syscall_fd_acquire(%p)\n", fd);
2159 }
2160
2161 static USED void syscall_fd_release(uptr pc, int fd) {
2162   TSAN_SYSCALL();
2163   DPrintf("syscall_fd_release(%p)\n", fd);
2164   FdRelease(thr, pc, fd);
2165 }
2166
2167 static void syscall_pre_fork(uptr pc) {
2168   TSAN_SYSCALL();
2169   ForkBefore(thr, pc);
2170 }
2171
2172 static void syscall_post_fork(uptr pc, int pid) {
2173   TSAN_SYSCALL();
2174   if (pid == 0) {
2175     // child
2176     ForkChildAfter(thr, pc);
2177     FdOnFork(thr, pc);
2178   } else if (pid > 0) {
2179     // parent
2180     ForkParentAfter(thr, pc);
2181   } else {
2182     // error
2183     ForkParentAfter(thr, pc);
2184   }
2185 }
2186
2187 #define COMMON_SYSCALL_PRE_READ_RANGE(p, s) \
2188   syscall_access_range(GET_CALLER_PC(), (uptr)(p), (uptr)(s), false)
2189
2190 #define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) \
2191   syscall_access_range(GET_CALLER_PC(), (uptr)(p), (uptr)(s), true)
2192
2193 #define COMMON_SYSCALL_POST_READ_RANGE(p, s) \
2194   do {                                       \
2195     (void)(p);                               \
2196     (void)(s);                               \
2197   } while (false)
2198
2199 #define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) \
2200   do {                                        \
2201     (void)(p);                                \
2202     (void)(s);                                \
2203   } while (false)
2204
2205 #define COMMON_SYSCALL_ACQUIRE(addr) \
2206     syscall_acquire(GET_CALLER_PC(), (uptr)(addr))
2207
2208 #define COMMON_SYSCALL_RELEASE(addr) \
2209     syscall_release(GET_CALLER_PC(), (uptr)(addr))
2210
2211 #define COMMON_SYSCALL_FD_CLOSE(fd) syscall_fd_close(GET_CALLER_PC(), fd)
2212
2213 #define COMMON_SYSCALL_FD_ACQUIRE(fd) syscall_fd_acquire(GET_CALLER_PC(), fd)
2214
2215 #define COMMON_SYSCALL_FD_RELEASE(fd) syscall_fd_release(GET_CALLER_PC(), fd)
2216
2217 #define COMMON_SYSCALL_PRE_FORK() \
2218   syscall_pre_fork(GET_CALLER_PC())
2219
2220 #define COMMON_SYSCALL_POST_FORK(res) \
2221   syscall_post_fork(GET_CALLER_PC(), res)
2222
2223 #include "sanitizer_common/sanitizer_common_syscalls.inc"
2224
2225 namespace __tsan {
2226
2227 static void finalize(void *arg) {
2228   ThreadState *thr = cur_thread();
2229   uptr pc = 0;
2230   atexit_ctx->exit(thr, pc);
2231   int status = Finalize(thr);
2232   // Make sure the output is not lost.
2233   // Flushing all the streams here may freeze the process if a child thread is
2234   // performing file stream operations at the same time.
2235   REAL(fflush)(stdout);
2236   REAL(fflush)(stderr);
2237   if (status)
2238     REAL(_exit)(status);
2239 }
2240
2241 static void unreachable() {
2242   Report("FATAL: ThreadSanitizer: unreachable called\n");
2243   Die();
2244 }
2245
2246 void InitializeInterceptors() {
2247   // We need to setup it early, because functions like dlsym() can call it.
2248   REAL(memset) = internal_memset;
2249   REAL(memcpy) = internal_memcpy;
2250   REAL(memcmp) = internal_memcmp;
2251
2252   // Instruct libc malloc to consume less memory.
2253   mallopt(1, 0);  // M_MXFAST
2254   mallopt(-3, 32*1024);  // M_MMAP_THRESHOLD
2255
2256   InitializeCommonInterceptors();
2257
2258   // We can not use TSAN_INTERCEPT to get setjmp addr,
2259   // because it does &setjmp and setjmp is not present in some versions of libc.
2260   using __interception::GetRealFunctionAddress;
2261   GetRealFunctionAddress("setjmp", (uptr*)&REAL(setjmp), 0, 0);
2262   GetRealFunctionAddress("_setjmp", (uptr*)&REAL(_setjmp), 0, 0);
2263   GetRealFunctionAddress("sigsetjmp", (uptr*)&REAL(sigsetjmp), 0, 0);
2264   GetRealFunctionAddress("__sigsetjmp", (uptr*)&REAL(__sigsetjmp), 0, 0);
2265
2266   TSAN_INTERCEPT(longjmp);
2267   TSAN_INTERCEPT(siglongjmp);
2268
2269   TSAN_INTERCEPT(malloc);
2270   TSAN_INTERCEPT(__libc_memalign);
2271   TSAN_INTERCEPT(calloc);
2272   TSAN_INTERCEPT(realloc);
2273   TSAN_INTERCEPT(free);
2274   TSAN_INTERCEPT(cfree);
2275   TSAN_INTERCEPT(mmap);
2276   TSAN_INTERCEPT(mmap64);
2277   TSAN_INTERCEPT(munmap);
2278   TSAN_INTERCEPT(memalign);
2279   TSAN_INTERCEPT(valloc);
2280   TSAN_INTERCEPT(pvalloc);
2281   TSAN_INTERCEPT(posix_memalign);
2282
2283   TSAN_INTERCEPT(strlen);
2284   TSAN_INTERCEPT(memset);
2285   TSAN_INTERCEPT(memcpy);
2286   TSAN_INTERCEPT(memmove);
2287   TSAN_INTERCEPT(memcmp);
2288   TSAN_INTERCEPT(strchr);
2289   TSAN_INTERCEPT(strchrnul);
2290   TSAN_INTERCEPT(strrchr);
2291   TSAN_INTERCEPT(strcpy);  // NOLINT
2292   TSAN_INTERCEPT(strncpy);
2293   TSAN_INTERCEPT(strstr);
2294   TSAN_INTERCEPT(strdup);
2295
2296   TSAN_INTERCEPT(pthread_create);
2297   TSAN_INTERCEPT(pthread_join);
2298   TSAN_INTERCEPT(pthread_detach);
2299
2300   TSAN_INTERCEPT_VER(pthread_cond_init, "GLIBC_2.3.2");
2301   TSAN_INTERCEPT_VER(pthread_cond_signal, "GLIBC_2.3.2");
2302   TSAN_INTERCEPT_VER(pthread_cond_broadcast, "GLIBC_2.3.2");
2303   TSAN_INTERCEPT_VER(pthread_cond_wait, "GLIBC_2.3.2");
2304   TSAN_INTERCEPT_VER(pthread_cond_timedwait, "GLIBC_2.3.2");
2305   TSAN_INTERCEPT_VER(pthread_cond_destroy, "GLIBC_2.3.2");
2306
2307   TSAN_INTERCEPT(pthread_mutex_init);
2308   TSAN_INTERCEPT(pthread_mutex_destroy);
2309   TSAN_INTERCEPT(pthread_mutex_trylock);
2310   TSAN_INTERCEPT(pthread_mutex_timedlock);
2311
2312   TSAN_INTERCEPT(pthread_spin_init);
2313   TSAN_INTERCEPT(pthread_spin_destroy);
2314   TSAN_INTERCEPT(pthread_spin_lock);
2315   TSAN_INTERCEPT(pthread_spin_trylock);
2316   TSAN_INTERCEPT(pthread_spin_unlock);
2317
2318   TSAN_INTERCEPT(pthread_rwlock_init);
2319   TSAN_INTERCEPT(pthread_rwlock_destroy);
2320   TSAN_INTERCEPT(pthread_rwlock_rdlock);
2321   TSAN_INTERCEPT(pthread_rwlock_tryrdlock);
2322   TSAN_INTERCEPT(pthread_rwlock_timedrdlock);
2323   TSAN_INTERCEPT(pthread_rwlock_wrlock);
2324   TSAN_INTERCEPT(pthread_rwlock_trywrlock);
2325   TSAN_INTERCEPT(pthread_rwlock_timedwrlock);
2326   TSAN_INTERCEPT(pthread_rwlock_unlock);
2327
2328   TSAN_INTERCEPT(pthread_barrier_init);
2329   TSAN_INTERCEPT(pthread_barrier_destroy);
2330   TSAN_INTERCEPT(pthread_barrier_wait);
2331
2332   TSAN_INTERCEPT(pthread_once);
2333
2334   TSAN_INTERCEPT(sem_init);
2335   TSAN_INTERCEPT(sem_destroy);
2336   TSAN_INTERCEPT(sem_wait);
2337   TSAN_INTERCEPT(sem_trywait);
2338   TSAN_INTERCEPT(sem_timedwait);
2339   TSAN_INTERCEPT(sem_post);
2340   TSAN_INTERCEPT(sem_getvalue);
2341
2342   TSAN_INTERCEPT(stat);
2343   TSAN_INTERCEPT(__xstat);
2344   TSAN_INTERCEPT(stat64);
2345   TSAN_INTERCEPT(__xstat64);
2346   TSAN_INTERCEPT(lstat);
2347   TSAN_INTERCEPT(__lxstat);
2348   TSAN_INTERCEPT(lstat64);
2349   TSAN_INTERCEPT(__lxstat64);
2350   TSAN_INTERCEPT(fstat);
2351   TSAN_INTERCEPT(__fxstat);
2352   TSAN_INTERCEPT(fstat64);
2353   TSAN_INTERCEPT(__fxstat64);
2354   TSAN_INTERCEPT(open);
2355   TSAN_INTERCEPT(open64);
2356   TSAN_INTERCEPT(creat);
2357   TSAN_INTERCEPT(creat64);
2358   TSAN_INTERCEPT(dup);
2359   TSAN_INTERCEPT(dup2);
2360   TSAN_INTERCEPT(dup3);
2361   TSAN_INTERCEPT(eventfd);
2362   TSAN_INTERCEPT(signalfd);
2363   TSAN_INTERCEPT(inotify_init);
2364   TSAN_INTERCEPT(inotify_init1);
2365   TSAN_INTERCEPT(socket);
2366   TSAN_INTERCEPT(socketpair);
2367   TSAN_INTERCEPT(connect);
2368   TSAN_INTERCEPT(bind);
2369   TSAN_INTERCEPT(listen);
2370   TSAN_INTERCEPT(epoll_create);
2371   TSAN_INTERCEPT(epoll_create1);
2372   TSAN_INTERCEPT(close);
2373   TSAN_INTERCEPT(__close);
2374   TSAN_INTERCEPT(__res_iclose);
2375   TSAN_INTERCEPT(pipe);
2376   TSAN_INTERCEPT(pipe2);
2377
2378   TSAN_INTERCEPT(send);
2379   TSAN_INTERCEPT(sendmsg);
2380   TSAN_INTERCEPT(recv);
2381
2382   TSAN_INTERCEPT(unlink);
2383   TSAN_INTERCEPT(tmpfile);
2384   TSAN_INTERCEPT(tmpfile64);
2385   TSAN_INTERCEPT(fread);
2386   TSAN_INTERCEPT(fwrite);
2387   TSAN_INTERCEPT(abort);
2388   TSAN_INTERCEPT(puts);
2389   TSAN_INTERCEPT(rmdir);
2390   TSAN_INTERCEPT(opendir);
2391
2392   TSAN_INTERCEPT(epoll_ctl);
2393   TSAN_INTERCEPT(epoll_wait);
2394
2395   TSAN_INTERCEPT(sigaction);
2396   TSAN_INTERCEPT(signal);
2397   TSAN_INTERCEPT(sigsuspend);
2398   TSAN_INTERCEPT(raise);
2399   TSAN_INTERCEPT(kill);
2400   TSAN_INTERCEPT(pthread_kill);
2401   TSAN_INTERCEPT(sleep);
2402   TSAN_INTERCEPT(usleep);
2403   TSAN_INTERCEPT(nanosleep);
2404   TSAN_INTERCEPT(gettimeofday);
2405   TSAN_INTERCEPT(getaddrinfo);
2406
2407   TSAN_INTERCEPT(fork);
2408   TSAN_INTERCEPT(vfork);
2409   TSAN_INTERCEPT(on_exit);
2410   TSAN_INTERCEPT(__cxa_atexit);
2411   TSAN_INTERCEPT(_exit);
2412
2413   // Need to setup it, because interceptors check that the function is resolved.
2414   // But atexit is emitted directly into the module, so can't be resolved.
2415   REAL(atexit) = (int(*)(void(*)()))unreachable;
2416   atexit_ctx = new(internal_alloc(MBlockAtExit, sizeof(AtExitContext)))
2417       AtExitContext();
2418
2419   if (REAL(__cxa_atexit)(&finalize, 0, 0)) {
2420     Printf("ThreadSanitizer: failed to setup atexit callback\n");
2421     Die();
2422   }
2423
2424   if (pthread_key_create(&g_thread_finalize_key, &thread_finalize)) {
2425     Printf("ThreadSanitizer: failed to create thread key\n");
2426     Die();
2427   }
2428
2429   FdInit();
2430
2431   // Remember list of loaded libraries for atexit interceptors.
2432   modules = (LoadedModule*)MmapOrDie(sizeof(*modules)*kMaxModules,
2433       "LoadedModule");
2434   nmodules = GetListOfModules(modules, kMaxModules, 0);
2435 }
2436
2437 void *internal_start_thread(void(*func)(void *arg), void *arg) {
2438   // Start the thread with signals blocked, otherwise it can steal user signals.
2439   __sanitizer_sigset_t set, old;
2440   internal_sigfillset(&set);
2441   internal_sigprocmask(SIG_SETMASK, &set, &old);
2442   void *th;
2443   REAL(pthread_create)(&th, 0, (void*(*)(void *arg))func, arg);
2444   internal_sigprocmask(SIG_SETMASK, &old, 0);
2445   return th;
2446 }
2447
2448 void internal_join_thread(void *th) {
2449   REAL(pthread_join)(th, 0);
2450 }
2451
2452 }  // namespace __tsan