tsan_interceptors.cc revision 9a949a8909f652b28e9084de785c848743139fd5 
1//===-- tsan_interceptors.cc ----------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file is a part of ThreadSanitizer (TSan), a race detector.
11//
12// FIXME: move as many interceptors as possible into
13// sanitizer_common/sanitizer_common_interceptors.inc
14//===----------------------------------------------------------------------===//
15
16#include "sanitizer_common/sanitizer_atomic.h"
17#include "sanitizer_common/sanitizer_libc.h"
18#include "sanitizer_common/sanitizer_linux.h"
19#include "sanitizer_common/sanitizer_platform_limits_posix.h"
20#include "sanitizer_common/sanitizer_placement_new.h"
21#include "sanitizer_common/sanitizer_stacktrace.h"
22#include "interception/interception.h"
23#include "tsan_interface.h"
24#include "tsan_platform.h"
25#include "tsan_rtl.h"
26#include "tsan_mman.h"
27#include "tsan_fd.h"
28
29using namespace __tsan;  // NOLINT
30
31const int kSigCount = 64;
32
33struct my_siginfo_t {
34  // The size is determined by looking at sizeof of real siginfo_t on linux.
35  u64 opaque[128 / sizeof(u64)];
36};
37
38struct ucontext_t {
39  // The size is determined by looking at sizeof of real ucontext_t on linux.
40  u64 opaque[936 / sizeof(u64) + 1];
41};
42
43extern "C" int pthread_attr_init(void *attr);
44extern "C" int pthread_attr_destroy(void *attr);
45extern "C" int pthread_attr_getdetachstate(void *attr, int *v);
46extern "C" int pthread_attr_setstacksize(void *attr, uptr stacksize);
47extern "C" int pthread_attr_getstacksize(void *attr, uptr *stacksize);
48extern "C" int pthread_key_create(unsigned *key, void (*destructor)(void* v));
49extern "C" int pthread_setspecific(unsigned key, const void *v);
50extern "C" int pthread_mutexattr_gettype(void *a, int *type);
51extern "C" int pthread_yield();
52extern "C" int pthread_sigmask(int how, const __sanitizer_sigset_t *set,
53                               __sanitizer_sigset_t *oldset);
54// REAL(sigfillset) defined in common interceptors.
55DECLARE_REAL(int, sigfillset, __sanitizer_sigset_t *set)
56extern "C" void *pthread_self();
57extern "C" void _exit(int status);
58extern "C" int *__errno_location();
59extern "C" int fileno_unlocked(void *stream);
60extern "C" void *__libc_malloc(uptr size);
61extern "C" void *__libc_calloc(uptr size, uptr n);
62extern "C" void *__libc_realloc(void *ptr, uptr size);
63extern "C" void __libc_free(void *ptr);
64extern "C" int mallopt(int param, int value);
65const int PTHREAD_MUTEX_RECURSIVE = 1;
66const int PTHREAD_MUTEX_RECURSIVE_NP = 1;
67const int EINVAL = 22;
68const int EBUSY = 16;
69const int EPOLL_CTL_ADD = 1;
70const int SIGILL = 4;
71const int SIGABRT = 6;
72const int SIGFPE = 8;
73const int SIGSEGV = 11;
74const int SIGPIPE = 13;
75const int SIGBUS = 7;
76const int SIGSYS = 31;
77void *const MAP_FAILED = (void*)-1;
78const int PTHREAD_BARRIER_SERIAL_THREAD = -1;
79const int MAP_FIXED = 0x10;
80typedef long long_t;  // NOLINT
81
82// From /usr/include/unistd.h
83# define F_ULOCK 0      /* Unlock a previously locked region.  */
84# define F_LOCK  1      /* Lock a region for exclusive use.  */
85# define F_TLOCK 2      /* Test and lock a region for exclusive use.  */
86# define F_TEST  3      /* Test a region for other processes locks.  */
87
88typedef void (*sighandler_t)(int sig);
89
90#define errno (*__errno_location())
91
92struct sigaction_t {
93  union {
94    sighandler_t sa_handler;
95    void (*sa_sigaction)(int sig, my_siginfo_t *siginfo, void *uctx);
96  };
97  __sanitizer_sigset_t sa_mask;
98  int sa_flags;
99  void (*sa_restorer)();
100};
101
102const sighandler_t SIG_DFL = (sighandler_t)0;
103const sighandler_t SIG_IGN = (sighandler_t)1;
104const sighandler_t SIG_ERR = (sighandler_t)-1;
105const int SA_SIGINFO = 4;
106const int SIG_SETMASK = 2;
107
108namespace std {
109struct nothrow_t {};
110}  // namespace std
111
112static sigaction_t sigactions[kSigCount];
113
114namespace __tsan {
115struct SignalDesc {
116  bool armed;
117  bool sigaction;
118  my_siginfo_t siginfo;
119  ucontext_t ctx;
120};
121
122struct SignalContext {
123  int in_blocking_func;
124  int int_signal_send;
125  int pending_signal_count;
126  SignalDesc pending_signals[kSigCount];
127};
128
129// Used to ignore interceptors coming directly from libjvm.so.
130atomic_uintptr_t libjvm_begin;
131atomic_uintptr_t libjvm_end;
132
133static bool libjvm_check(uptr pc) {
134  uptr begin = atomic_load(&libjvm_begin, memory_order_relaxed);
135  if (begin != 0 && pc >= begin) {
136    uptr end = atomic_load(&libjvm_end, memory_order_relaxed);
137    if (end != 0 && pc < end)
138      return true;
139  }
140  return false;
141}
142
143}  // namespace __tsan
144
145static SignalContext *SigCtx(ThreadState *thr) {
146  SignalContext *ctx = (SignalContext*)thr->signal_ctx;
147  if (ctx == 0 && thr->is_alive) {
148    ScopedInRtl in_rtl;
149    ctx = (SignalContext*)MmapOrDie(sizeof(*ctx), "SignalContext");
150    MemoryResetRange(thr, (uptr)&SigCtx, (uptr)ctx, sizeof(*ctx));
151    thr->signal_ctx = ctx;
152  }
153  return ctx;
154}
155
156static unsigned g_thread_finalize_key;
157
158class ScopedInterceptor {
159 public:
160  ScopedInterceptor(ThreadState *thr, const char *fname, uptr pc);
161  ~ScopedInterceptor();
162 private:
163  ThreadState *const thr_;
164  const int in_rtl_;
165};
166
167ScopedInterceptor::ScopedInterceptor(ThreadState *thr, const char *fname,
168                                     uptr pc)
169    : thr_(thr)
170    , in_rtl_(thr->in_rtl) {
171  if (thr_->in_rtl == 0) {
172    Initialize(thr);
173    FuncEntry(thr, pc);
174    thr_->in_rtl++;
175    DPrintf("#%d: intercept %s()\n", thr_->tid, fname);
176  } else {
177    thr_->in_rtl++;
178  }
179}
180
181ScopedInterceptor::~ScopedInterceptor() {
182  thr_->in_rtl--;
183  if (thr_->in_rtl == 0) {
184    FuncExit(thr_);
185    ProcessPendingSignals(thr_);
186  }
187  CHECK_EQ(in_rtl_, thr_->in_rtl);
188}
189
190#define SCOPED_INTERCEPTOR_RAW(func, ...) \
191    ThreadState *thr = cur_thread(); \
192    StatInc(thr, StatInterceptor); \
193    StatInc(thr, StatInt_##func); \
194    const uptr caller_pc = GET_CALLER_PC(); \
195    ScopedInterceptor si(thr, #func, caller_pc); \
196    const uptr pc = __sanitizer::StackTrace::GetCurrentPc(); \
197    (void)pc; \
198/**/
199
200#define SCOPED_TSAN_INTERCEPTOR(func, ...) \
201    SCOPED_INTERCEPTOR_RAW(func, __VA_ARGS__); \
202    if (REAL(func) == 0) { \
203      Printf("FATAL: ThreadSanitizer: failed to intercept %s\n", #func); \
204      Die(); \
205    } \
206    if (thr->in_rtl > 1 || libjvm_check(pc)) \
207      return REAL(func)(__VA_ARGS__); \
208/**/
209
210#define TSAN_INTERCEPTOR(ret, func, ...) INTERCEPTOR(ret, func, __VA_ARGS__)
211#define TSAN_INTERCEPT(func) INTERCEPT_FUNCTION(func)
212
213#define BLOCK_REAL(name) (BlockingCall(thr), REAL(name))
214
215struct BlockingCall {
216  explicit BlockingCall(ThreadState *thr)
217      : ctx(SigCtx(thr)) {
218    ctx->in_blocking_func++;
219  }
220
221  ~BlockingCall() {
222    ctx->in_blocking_func--;
223  }
224
225  SignalContext *ctx;
226};
227
228TSAN_INTERCEPTOR(unsigned, sleep, unsigned sec) {
229  SCOPED_TSAN_INTERCEPTOR(sleep, sec);
230  unsigned res = BLOCK_REAL(sleep)(sec);
231  AfterSleep(thr, pc);
232  return res;
233}
234
235TSAN_INTERCEPTOR(int, usleep, long_t usec) {
236  SCOPED_TSAN_INTERCEPTOR(usleep, usec);
237  int res = BLOCK_REAL(usleep)(usec);
238  AfterSleep(thr, pc);
239  return res;
240}
241
242TSAN_INTERCEPTOR(int, nanosleep, void *req, void *rem) {
243  SCOPED_TSAN_INTERCEPTOR(nanosleep, req, rem);
244  int res = BLOCK_REAL(nanosleep)(req, rem);
245  AfterSleep(thr, pc);
246  return res;
247}
248
249class AtExitContext {
250 public:
251  AtExitContext()
252    : mtx_(MutexTypeAtExit, StatMtxAtExit)
253    , pos_() {
254  }
255
256  typedef void(*atexit_t)();
257
258  int atexit(ThreadState *thr, uptr pc, bool is_on_exit,
259             atexit_t f, void *arg) {
260    Lock l(&mtx_);
261    if (pos_ == kMaxAtExit)
262      return 1;
263    Release(thr, pc, (uptr)this);
264    stack_[pos_] = f;
265    args_[pos_] = arg;
266    is_on_exits_[pos_] = is_on_exit;
267    pos_++;
268    return 0;
269  }
270
271  void exit(ThreadState *thr, uptr pc) {
272    CHECK_EQ(thr->in_rtl, 0);
273    for (;;) {
274      atexit_t f = 0;
275      void *arg = 0;
276      bool is_on_exit = false;
277      {
278        Lock l(&mtx_);
279        if (pos_) {
280          pos_--;
281          f = stack_[pos_];
282          arg = args_[pos_];
283          is_on_exit = is_on_exits_[pos_];
284          ScopedInRtl in_rtl;
285          Acquire(thr, pc, (uptr)this);
286        }
287      }
288      if (f == 0)
289        break;
290      DPrintf("#%d: executing atexit func %p\n", thr->tid, f);
291      CHECK_EQ(thr->in_rtl, 0);
292      if (is_on_exit)
293        ((void(*)(int status, void *arg))f)(0, arg);
294      else
295        ((void(*)(void *arg, void *dso))f)(arg, 0);
296    }
297  }
298
299 private:
300  static const int kMaxAtExit = 128;
301  Mutex mtx_;
302  atexit_t stack_[kMaxAtExit];
303  void *args_[kMaxAtExit];
304  bool is_on_exits_[kMaxAtExit];
305  int pos_;
306};
307
308static AtExitContext *atexit_ctx;
309
310TSAN_INTERCEPTOR(int, atexit, void (*f)()) {
311  if (cur_thread()->in_symbolizer)
312    return 0;
313  SCOPED_TSAN_INTERCEPTOR(atexit, f);
314  return atexit_ctx->atexit(thr, pc, false, (void(*)())f, 0);
315}
316
317TSAN_INTERCEPTOR(int, on_exit, void(*f)(int, void*), void *arg) {
318  if (cur_thread()->in_symbolizer)
319    return 0;
320  SCOPED_TSAN_INTERCEPTOR(on_exit, f, arg);
321  return atexit_ctx->atexit(thr, pc, true, (void(*)())f, arg);
322}
323
324TSAN_INTERCEPTOR(int, __cxa_atexit, void (*f)(void *a), void *arg, void *dso) {
325  if (cur_thread()->in_symbolizer)
326    return 0;
327  SCOPED_TSAN_INTERCEPTOR(__cxa_atexit, f, arg, dso);
328  if (dso) {
329    // Memory allocation in __cxa_atexit will race with free during exit,
330    // because we do not see synchronization around atexit callback list.
331    ThreadIgnoreBegin(thr);
332    int res = REAL(__cxa_atexit)(f, arg, dso);
333    ThreadIgnoreEnd(thr);
334    return res;
335  }
336  return atexit_ctx->atexit(thr, pc, false, (void(*)())f, arg);
337}
338
339// Cleanup old bufs.
340static void JmpBufGarbageCollect(ThreadState *thr, uptr sp) {
341  for (uptr i = 0; i < thr->jmp_bufs.Size(); i++) {
342    JmpBuf *buf = &thr->jmp_bufs[i];
343    if (buf->sp <= sp) {
344      uptr sz = thr->jmp_bufs.Size();
345      thr->jmp_bufs[i] = thr->jmp_bufs[sz - 1];
346      thr->jmp_bufs.PopBack();
347      i--;
348    }
349  }
350}
351
352static void SetJmp(ThreadState *thr, uptr sp, uptr mangled_sp) {
353  if (thr->shadow_stack_pos == 0)  // called from libc guts during bootstrap
354    return;
355  // Cleanup old bufs.
356  JmpBufGarbageCollect(thr, sp);
357  // Remember the buf.
358  JmpBuf *buf = thr->jmp_bufs.PushBack();
359  buf->sp = sp;
360  buf->mangled_sp = mangled_sp;
361  buf->shadow_stack_pos = thr->shadow_stack_pos;
362}
363
364static void LongJmp(ThreadState *thr, uptr *env) {
365  uptr mangled_sp = env[6];
366  // Find the saved buf by mangled_sp.
367  for (uptr i = 0; i < thr->jmp_bufs.Size(); i++) {
368    JmpBuf *buf = &thr->jmp_bufs[i];
369    if (buf->mangled_sp == mangled_sp) {
370      CHECK_GE(thr->shadow_stack_pos, buf->shadow_stack_pos);
371      // Unwind the stack.
372      while (thr->shadow_stack_pos > buf->shadow_stack_pos)
373        FuncExit(thr);
374      JmpBufGarbageCollect(thr, buf->sp - 1);  // do not collect buf->sp
375      return;
376    }
377  }
378  Printf("ThreadSanitizer: can't find longjmp buf\n");
379  CHECK(0);
380}
381
382// FIXME: put everything below into a common extern "C" block?
383extern "C" void __tsan_setjmp(uptr sp, uptr mangled_sp) {
384  ScopedInRtl in_rtl;
385  SetJmp(cur_thread(), sp, mangled_sp);
386}
387
388// Not called.  Merely to satisfy TSAN_INTERCEPT().
389extern "C" SANITIZER_INTERFACE_ATTRIBUTE
390int __interceptor_setjmp(void *env);
391extern "C" int __interceptor_setjmp(void *env) {
392  CHECK(0);
393  return 0;
394}
395
396// FIXME: any reason to have a separate declaration?
397extern "C" SANITIZER_INTERFACE_ATTRIBUTE
398int __interceptor__setjmp(void *env);
399extern "C" int __interceptor__setjmp(void *env) {
400  CHECK(0);
401  return 0;
402}
403
404extern "C" SANITIZER_INTERFACE_ATTRIBUTE
405int __interceptor_sigsetjmp(void *env);
406extern "C" int __interceptor_sigsetjmp(void *env) {
407  CHECK(0);
408  return 0;
409}
410
411extern "C" SANITIZER_INTERFACE_ATTRIBUTE
412int __interceptor___sigsetjmp(void *env);
413extern "C" int __interceptor___sigsetjmp(void *env) {
414  CHECK(0);
415  return 0;
416}
417
418extern "C" int setjmp(void *env);
419extern "C" int _setjmp(void *env);
420extern "C" int sigsetjmp(void *env);
421extern "C" int __sigsetjmp(void *env);
422DEFINE_REAL(int, setjmp, void *env)
423DEFINE_REAL(int, _setjmp, void *env)
424DEFINE_REAL(int, sigsetjmp, void *env)
425DEFINE_REAL(int, __sigsetjmp, void *env)
426
427TSAN_INTERCEPTOR(void, longjmp, uptr *env, int val) {
428  {
429    SCOPED_TSAN_INTERCEPTOR(longjmp, env, val);
430  }
431  LongJmp(cur_thread(), env);
432  REAL(longjmp)(env, val);
433}
434
435TSAN_INTERCEPTOR(void, siglongjmp, uptr *env, int val) {
436  {
437    SCOPED_TSAN_INTERCEPTOR(siglongjmp, env, val);
438  }
439  LongJmp(cur_thread(), env);
440  REAL(siglongjmp)(env, val);
441}
442
443TSAN_INTERCEPTOR(void*, malloc, uptr size) {
444  if (cur_thread()->in_symbolizer || libjvm_check(GET_CALLER_PC()))
445    return __libc_malloc(size);
446  void *p = 0;
447  {
448    SCOPED_INTERCEPTOR_RAW(malloc, size);
449    p = user_alloc(thr, pc, size);
450  }
451  invoke_malloc_hook(p, size);
452  return p;
453}
454
455TSAN_INTERCEPTOR(void*, __libc_memalign, uptr align, uptr sz) {
456  SCOPED_TSAN_INTERCEPTOR(__libc_memalign, align, sz);
457  return user_alloc(thr, pc, sz, align);
458}
459
460TSAN_INTERCEPTOR(void*, calloc, uptr size, uptr n) {
461  if (cur_thread()->in_symbolizer || libjvm_check(GET_CALLER_PC()))
462    return __libc_calloc(size, n);
463  if (__sanitizer::CallocShouldReturnNullDueToOverflow(size, n))
464    return AllocatorReturnNull();
465  void *p = 0;
466  {
467    SCOPED_INTERCEPTOR_RAW(calloc, size, n);
468    p = user_alloc(thr, pc, n * size);
469    if (p)
470      internal_memset(p, 0, n * size);
471  }
472  invoke_malloc_hook(p, n * size);
473  return p;
474}
475
476TSAN_INTERCEPTOR(void*, realloc, void *p, uptr size) {
477  if (cur_thread()->in_symbolizer || libjvm_check(GET_CALLER_PC()))
478    return __libc_realloc(p, size);
479  if (p)
480    invoke_free_hook(p);
481  {
482    SCOPED_INTERCEPTOR_RAW(realloc, p, size);
483    p = user_realloc(thr, pc, p, size);
484  }
485  invoke_malloc_hook(p, size);
486  return p;
487}
488
489TSAN_INTERCEPTOR(void, free, void *p) {
490  if (p == 0)
491    return;
492  if (cur_thread()->in_symbolizer || libjvm_check(GET_CALLER_PC()))
493    return __libc_free(p);
494  invoke_free_hook(p);
495  SCOPED_INTERCEPTOR_RAW(free, p);
496  user_free(thr, pc, p);
497}
498
499TSAN_INTERCEPTOR(void, cfree, void *p) {
500  if (p == 0)
501    return;
502  if (cur_thread()->in_symbolizer || libjvm_check(GET_CALLER_PC()))
503    return __libc_free(p);
504  invoke_free_hook(p);
505  SCOPED_INTERCEPTOR_RAW(cfree, p);
506  user_free(thr, pc, p);
507}
508
509TSAN_INTERCEPTOR(uptr, malloc_usable_size, void *p) {
510  SCOPED_INTERCEPTOR_RAW(malloc_usable_size, p);
511  if (libjvm_check(pc))
512    return malloc_usable_size(p);
513  return user_alloc_usable_size(thr, pc, p);
514}
515
516#define OPERATOR_NEW_BODY(mangled_name) \
517  if (cur_thread()->in_symbolizer || libjvm_check(GET_CALLER_PC())) \
518    return __libc_malloc(size); \
519  void *p = 0; \
520  {  \
521    SCOPED_INTERCEPTOR_RAW(mangled_name, size); \
522    p = user_alloc(thr, pc, size); \
523  }  \
524  invoke_malloc_hook(p, size);  \
525  return p;
526
527SANITIZER_INTERFACE_ATTRIBUTE
528void *operator new(__sanitizer::uptr size);
529void *operator new(__sanitizer::uptr size) {
530  OPERATOR_NEW_BODY(_Znwm);
531}
532
533SANITIZER_INTERFACE_ATTRIBUTE
534void *operator new[](__sanitizer::uptr size);
535void *operator new[](__sanitizer::uptr size) {
536  OPERATOR_NEW_BODY(_Znam);
537}
538
539SANITIZER_INTERFACE_ATTRIBUTE
540void *operator new(__sanitizer::uptr size, std::nothrow_t const&);
541void *operator new(__sanitizer::uptr size, std::nothrow_t const&) {
542  OPERATOR_NEW_BODY(_ZnwmRKSt9nothrow_t);
543}
544
545SANITIZER_INTERFACE_ATTRIBUTE
546void *operator new[](__sanitizer::uptr size, std::nothrow_t const&);
547void *operator new[](__sanitizer::uptr size, std::nothrow_t const&) {
548  OPERATOR_NEW_BODY(_ZnamRKSt9nothrow_t);
549}
550
551#define OPERATOR_DELETE_BODY(mangled_name) \
552  if (ptr == 0) return;  \
553  if (cur_thread()->in_symbolizer || libjvm_check(GET_CALLER_PC())) \
554    return __libc_free(ptr); \
555  invoke_free_hook(ptr);  \
556  SCOPED_INTERCEPTOR_RAW(mangled_name, ptr);  \
557  user_free(thr, pc, ptr);
558
559SANITIZER_INTERFACE_ATTRIBUTE
560void operator delete(void *ptr);
561void operator delete(void *ptr) {
562  OPERATOR_DELETE_BODY(_ZdlPv);
563}
564
565SANITIZER_INTERFACE_ATTRIBUTE
566void operator delete[](void *ptr);
567void operator delete[](void *ptr) {
568  OPERATOR_DELETE_BODY(_ZdlPvRKSt9nothrow_t);
569}
570
571SANITIZER_INTERFACE_ATTRIBUTE
572void operator delete(void *ptr, std::nothrow_t const&);
573void operator delete(void *ptr, std::nothrow_t const&) {
574  OPERATOR_DELETE_BODY(_ZdaPv);
575}
576
577SANITIZER_INTERFACE_ATTRIBUTE
578void operator delete[](void *ptr, std::nothrow_t const&);
579void operator delete[](void *ptr, std::nothrow_t const&) {
580  OPERATOR_DELETE_BODY(_ZdaPvRKSt9nothrow_t);
581}
582
583TSAN_INTERCEPTOR(uptr, strlen, const char *s) {
584  SCOPED_TSAN_INTERCEPTOR(strlen, s);
585  uptr len = internal_strlen(s);
586  MemoryAccessRange(thr, pc, (uptr)s, len + 1, false);
587  return len;
588}
589
590TSAN_INTERCEPTOR(void*, memset, void *dst, int v, uptr size) {
591  SCOPED_TSAN_INTERCEPTOR(memset, dst, v, size);
592  MemoryAccessRange(thr, pc, (uptr)dst, size, true);
593  return internal_memset(dst, v, size);
594}
595
596TSAN_INTERCEPTOR(void*, memcpy, void *dst, const void *src, uptr size) {
597  SCOPED_TSAN_INTERCEPTOR(memcpy, dst, src, size);
598  MemoryAccessRange(thr, pc, (uptr)dst, size, true);
599  MemoryAccessRange(thr, pc, (uptr)src, size, false);
600  return internal_memcpy(dst, src, size);
601}
602
603TSAN_INTERCEPTOR(int, memcmp, const void *s1, const void *s2, uptr n) {
604  SCOPED_TSAN_INTERCEPTOR(memcmp, s1, s2, n);
605  int res = 0;
606  uptr len = 0;
607  for (; len < n; len++) {
608    if ((res = ((unsigned char*)s1)[len] - ((unsigned char*)s2)[len]))
609      break;
610  }
611  MemoryAccessRange(thr, pc, (uptr)s1, len < n ? len + 1 : n, false);
612  MemoryAccessRange(thr, pc, (uptr)s2, len < n ? len + 1 : n, false);
613  return res;
614}
615
616TSAN_INTERCEPTOR(void*, memchr, void *s, int c, uptr n) {
617  SCOPED_TSAN_INTERCEPTOR(memchr, s, c, n);
618  void *res = REAL(memchr)(s, c, n);
619  uptr len = res ? (char*)res - (char*)s + 1 : n;
620  MemoryAccessRange(thr, pc, (uptr)s, len, false);
621  return res;
622}
623
624TSAN_INTERCEPTOR(void*, memrchr, char *s, int c, uptr n) {
625  SCOPED_TSAN_INTERCEPTOR(memrchr, s, c, n);
626  MemoryAccessRange(thr, pc, (uptr)s, n, false);
627  return REAL(memrchr)(s, c, n);
628}
629
630TSAN_INTERCEPTOR(void*, memmove, void *dst, void *src, uptr n) {
631  SCOPED_TSAN_INTERCEPTOR(memmove, dst, src, n);
632  MemoryAccessRange(thr, pc, (uptr)dst, n, true);
633  MemoryAccessRange(thr, pc, (uptr)src, n, false);
634  return REAL(memmove)(dst, src, n);
635}
636
637TSAN_INTERCEPTOR(char*, strchr, char *s, int c) {
638  SCOPED_TSAN_INTERCEPTOR(strchr, s, c);
639  char *res = REAL(strchr)(s, c);
640  uptr len = res ? (char*)res - (char*)s + 1 : internal_strlen(s) + 1;
641  MemoryAccessRange(thr, pc, (uptr)s, len, false);
642  return res;
643}
644
645TSAN_INTERCEPTOR(char*, strchrnul, char *s, int c) {
646  SCOPED_TSAN_INTERCEPTOR(strchrnul, s, c);
647  char *res = REAL(strchrnul)(s, c);
648  uptr len = (char*)res - (char*)s + 1;
649  MemoryAccessRange(thr, pc, (uptr)s, len, false);
650  return res;
651}
652
653TSAN_INTERCEPTOR(char*, strrchr, char *s, int c) {
654  SCOPED_TSAN_INTERCEPTOR(strrchr, s, c);
655  MemoryAccessRange(thr, pc, (uptr)s, internal_strlen(s) + 1, false);
656  return REAL(strrchr)(s, c);
657}
658
659TSAN_INTERCEPTOR(char*, strcpy, char *dst, const char *src) {  // NOLINT
660  SCOPED_TSAN_INTERCEPTOR(strcpy, dst, src);  // NOLINT
661  uptr srclen = internal_strlen(src);
662  MemoryAccessRange(thr, pc, (uptr)dst, srclen + 1, true);
663  MemoryAccessRange(thr, pc, (uptr)src, srclen + 1, false);
664  return REAL(strcpy)(dst, src);  // NOLINT
665}
666
667TSAN_INTERCEPTOR(char*, strncpy, char *dst, char *src, uptr n) {
668  SCOPED_TSAN_INTERCEPTOR(strncpy, dst, src, n);
669  uptr srclen = internal_strnlen(src, n);
670  MemoryAccessRange(thr, pc, (uptr)dst, n, true);
671  MemoryAccessRange(thr, pc, (uptr)src, min(srclen + 1, n), false);
672  return REAL(strncpy)(dst, src, n);
673}
674
675TSAN_INTERCEPTOR(const char*, strstr, const char *s1, const char *s2) {
676  SCOPED_TSAN_INTERCEPTOR(strstr, s1, s2);
677  const char *res = REAL(strstr)(s1, s2);
678  uptr len1 = internal_strlen(s1);
679  uptr len2 = internal_strlen(s2);
680  MemoryAccessRange(thr, pc, (uptr)s1, len1 + 1, false);
681  MemoryAccessRange(thr, pc, (uptr)s2, len2 + 1, false);
682  return res;
683}
684
685TSAN_INTERCEPTOR(char*, strdup, const char *str) {
686  SCOPED_TSAN_INTERCEPTOR(strdup, str);
687  if (libjvm_check(pc)) {
688    // The memory must come from libc malloc,
689    // and we must not instrument accesses in this case.
690    uptr n = internal_strlen(str) + 1;
691    void *p = __libc_malloc(n);
692    if (p == 0)
693      return 0;
694    return (char*)internal_memcpy(p, str, n);
695  }
696  // strdup will call malloc, so no instrumentation is required here.
697  return REAL(strdup)(str);
698}
699
700static bool fix_mmap_addr(void **addr, long_t sz, int flags) {
701  if (*addr) {
702    if (!IsAppMem((uptr)*addr) || !IsAppMem((uptr)*addr + sz - 1)) {
703      if (flags & MAP_FIXED) {
704        errno = EINVAL;
705        return false;
706      } else {
707        *addr = 0;
708      }
709    }
710  }
711  return true;
712}
713
714TSAN_INTERCEPTOR(void*, mmap, void *addr, long_t sz, int prot,
715                         int flags, int fd, unsigned off) {
716  SCOPED_TSAN_INTERCEPTOR(mmap, addr, sz, prot, flags, fd, off);
717  if (!fix_mmap_addr(&addr, sz, flags))
718    return MAP_FAILED;
719  void *res = REAL(mmap)(addr, sz, prot, flags, fd, off);
720  if (res != MAP_FAILED) {
721    if (fd > 0)
722      FdAccess(thr, pc, fd);
723    MemoryRangeImitateWrite(thr, pc, (uptr)res, sz);
724  }
725  return res;
726}
727
728TSAN_INTERCEPTOR(void*, mmap64, void *addr, long_t sz, int prot,
729                           int flags, int fd, u64 off) {
730  SCOPED_TSAN_INTERCEPTOR(mmap64, addr, sz, prot, flags, fd, off);
731  if (!fix_mmap_addr(&addr, sz, flags))
732    return MAP_FAILED;
733  void *res = REAL(mmap64)(addr, sz, prot, flags, fd, off);
734  if (res != MAP_FAILED) {
735    if (fd > 0)
736      FdAccess(thr, pc, fd);
737    MemoryRangeImitateWrite(thr, pc, (uptr)res, sz);
738  }
739  return res;
740}
741
742TSAN_INTERCEPTOR(int, munmap, void *addr, long_t sz) {
743  SCOPED_TSAN_INTERCEPTOR(munmap, addr, sz);
744  DontNeedShadowFor((uptr)addr, sz);
745  int res = REAL(munmap)(addr, sz);
746  return res;
747}
748
749TSAN_INTERCEPTOR(void*, memalign, uptr align, uptr sz) {
750  SCOPED_TSAN_INTERCEPTOR(memalign, align, sz);
751  return user_alloc(thr, pc, sz, align);
752}
753
754TSAN_INTERCEPTOR(void*, valloc, uptr sz) {
755  SCOPED_TSAN_INTERCEPTOR(valloc, sz);
756  return user_alloc(thr, pc, sz, GetPageSizeCached());
757}
758
759TSAN_INTERCEPTOR(void*, pvalloc, uptr sz) {
760  SCOPED_TSAN_INTERCEPTOR(pvalloc, sz);
761  sz = RoundUp(sz, GetPageSizeCached());
762  return user_alloc(thr, pc, sz, GetPageSizeCached());
763}
764
765TSAN_INTERCEPTOR(int, posix_memalign, void **memptr, uptr align, uptr sz) {
766  SCOPED_TSAN_INTERCEPTOR(posix_memalign, memptr, align, sz);
767  *memptr = user_alloc(thr, pc, sz, align);
768  return 0;
769}
770
771// Used in thread-safe function static initialization.
772extern "C" int INTERFACE_ATTRIBUTE __cxa_guard_acquire(atomic_uint32_t *g) {
773  SCOPED_INTERCEPTOR_RAW(__cxa_guard_acquire, g);
774  for (;;) {
775    u32 cmp = atomic_load(g, memory_order_acquire);
776    if (cmp == 0) {
777      if (atomic_compare_exchange_strong(g, &cmp, 1<<16, memory_order_relaxed))
778        return 1;
779    } else if (cmp == 1) {
780      Acquire(thr, pc, (uptr)g);
781      return 0;
782    } else {
783      internal_sched_yield();
784    }
785  }
786}
787
788extern "C" void INTERFACE_ATTRIBUTE __cxa_guard_release(atomic_uint32_t *g) {
789  SCOPED_INTERCEPTOR_RAW(__cxa_guard_release, g);
790  Release(thr, pc, (uptr)g);
791  atomic_store(g, 1, memory_order_release);
792}
793
794extern "C" void INTERFACE_ATTRIBUTE __cxa_guard_abort(atomic_uint32_t *g) {
795  SCOPED_INTERCEPTOR_RAW(__cxa_guard_abort, g);
796  atomic_store(g, 0, memory_order_relaxed);
797}
798
799static void thread_finalize(void *v) {
800  uptr iter = (uptr)v;
801  if (iter > 1) {
802    if (pthread_setspecific(g_thread_finalize_key, (void*)(iter - 1))) {
803      Printf("ThreadSanitizer: failed to set thread key\n");
804      Die();
805    }
806    return;
807  }
808  {
809    ScopedInRtl in_rtl;
810    ThreadState *thr = cur_thread();
811    ThreadFinish(thr);
812    SignalContext *sctx = thr->signal_ctx;
813    if (sctx) {
814      thr->signal_ctx = 0;
815      UnmapOrDie(sctx, sizeof(*sctx));
816    }
817  }
818}
819
820
821struct ThreadParam {
822  void* (*callback)(void *arg);
823  void *param;
824  atomic_uintptr_t tid;
825};
826
827extern "C" void *__tsan_thread_start_func(void *arg) {
828  ThreadParam *p = (ThreadParam*)arg;
829  void* (*callback)(void *arg) = p->callback;
830  void *param = p->param;
831  int tid = 0;
832  {
833    ThreadState *thr = cur_thread();
834    ScopedInRtl in_rtl;
835    if (pthread_setspecific(g_thread_finalize_key, (void*)4)) {
836      Printf("ThreadSanitizer: failed to set thread key\n");
837      Die();
838    }
839    while ((tid = atomic_load(&p->tid, memory_order_acquire)) == 0)
840      pthread_yield();
841    atomic_store(&p->tid, 0, memory_order_release);
842    ThreadStart(thr, tid, GetTid());
843    CHECK_EQ(thr->in_rtl, 1);
844  }
845  void *res = callback(param);
846  // Prevent the callback from being tail called,
847  // it mixes up stack traces.
848  volatile int foo = 42;
849  foo++;
850  return res;
851}
852
853TSAN_INTERCEPTOR(int, pthread_create,
854    void *th, void *attr, void *(*callback)(void*), void * param) {
855  SCOPED_TSAN_INTERCEPTOR(pthread_create, th, attr, callback, param);
856  __sanitizer_pthread_attr_t myattr;
857  if (attr == 0) {
858    pthread_attr_init(&myattr);
859    attr = &myattr;
860  }
861  int detached = 0;
862  pthread_attr_getdetachstate(attr, &detached);
863
864#if defined(TSAN_DEBUG_OUTPUT)
865  int verbosity = (TSAN_DEBUG_OUTPUT);
866#else
867  int verbosity = 0;
868#endif
869  AdjustStackSizeLinux(attr, verbosity);
870
871  ThreadParam p;
872  p.callback = callback;
873  p.param = param;
874  atomic_store(&p.tid, 0, memory_order_relaxed);
875  int res = REAL(pthread_create)(th, attr, __tsan_thread_start_func, &p);
876  if (res == 0) {
877    int tid = ThreadCreate(thr, pc, *(uptr*)th, detached);
878    CHECK_NE(tid, 0);
879    atomic_store(&p.tid, tid, memory_order_release);
880    while (atomic_load(&p.tid, memory_order_acquire) != 0)
881      pthread_yield();
882  }
883  if (attr == &myattr)
884    pthread_attr_destroy(&myattr);
885  return res;
886}
887
888TSAN_INTERCEPTOR(int, pthread_join, void *th, void **ret) {
889  SCOPED_TSAN_INTERCEPTOR(pthread_join, th, ret);
890  int tid = ThreadTid(thr, pc, (uptr)th);
891  int res = BLOCK_REAL(pthread_join)(th, ret);
892  if (res == 0) {
893    ThreadJoin(thr, pc, tid);
894  }
895  return res;
896}
897
898TSAN_INTERCEPTOR(int, pthread_detach, void *th) {
899  SCOPED_TSAN_INTERCEPTOR(pthread_detach, th);
900  int tid = ThreadTid(thr, pc, (uptr)th);
901  int res = REAL(pthread_detach)(th);
902  if (res == 0) {
903    ThreadDetach(thr, pc, tid);
904  }
905  return res;
906}
907
908TSAN_INTERCEPTOR(int, pthread_mutex_init, void *m, void *a) {
909  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_init, m, a);
910  int res = REAL(pthread_mutex_init)(m, a);
911  if (res == 0) {
912    bool recursive = false;
913    if (a) {
914      int type = 0;
915      if (pthread_mutexattr_gettype(a, &type) == 0)
916        recursive = (type == PTHREAD_MUTEX_RECURSIVE
917            || type == PTHREAD_MUTEX_RECURSIVE_NP);
918    }
919    MutexCreate(thr, pc, (uptr)m, false, recursive, false);
920  }
921  return res;
922}
923
924TSAN_INTERCEPTOR(int, pthread_mutex_destroy, void *m) {
925  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_destroy, m);
926  int res = REAL(pthread_mutex_destroy)(m);
927  if (res == 0 || res == EBUSY) {
928    MutexDestroy(thr, pc, (uptr)m);
929  }
930  return res;
931}
932
933TSAN_INTERCEPTOR(int, pthread_mutex_lock, void *m) {
934  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_lock, m);
935  int res = REAL(pthread_mutex_lock)(m);
936  if (res == 0) {
937    MutexLock(thr, pc, (uptr)m);
938  }
939  return res;
940}
941
942TSAN_INTERCEPTOR(int, pthread_mutex_trylock, void *m) {
943  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_trylock, m);
944  int res = REAL(pthread_mutex_trylock)(m);
945  if (res == 0) {
946    MutexLock(thr, pc, (uptr)m);
947  }
948  return res;
949}
950
951TSAN_INTERCEPTOR(int, pthread_mutex_timedlock, void *m, void *abstime) {
952  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_timedlock, m, abstime);
953  int res = REAL(pthread_mutex_timedlock)(m, abstime);
954  if (res == 0) {
955    MutexLock(thr, pc, (uptr)m);
956  }
957  return res;
958}
959
960TSAN_INTERCEPTOR(int, pthread_mutex_unlock, void *m) {
961  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_unlock, m);
962  MutexUnlock(thr, pc, (uptr)m);
963  int res = REAL(pthread_mutex_unlock)(m);
964  return res;
965}
966
967TSAN_INTERCEPTOR(int, pthread_spin_init, void *m, int pshared) {
968  SCOPED_TSAN_INTERCEPTOR(pthread_spin_init, m, pshared);
969  int res = REAL(pthread_spin_init)(m, pshared);
970  if (res == 0) {
971    MutexCreate(thr, pc, (uptr)m, false, false, false);
972  }
973  return res;
974}
975
976TSAN_INTERCEPTOR(int, pthread_spin_destroy, void *m) {
977  SCOPED_TSAN_INTERCEPTOR(pthread_spin_destroy, m);
978  int res = REAL(pthread_spin_destroy)(m);
979  if (res == 0) {
980    MutexDestroy(thr, pc, (uptr)m);
981  }
982  return res;
983}
984
985TSAN_INTERCEPTOR(int, pthread_spin_lock, void *m) {
986  SCOPED_TSAN_INTERCEPTOR(pthread_spin_lock, m);
987  int res = REAL(pthread_spin_lock)(m);
988  if (res == 0) {
989    MutexLock(thr, pc, (uptr)m);
990  }
991  return res;
992}
993
994TSAN_INTERCEPTOR(int, pthread_spin_trylock, void *m) {
995  SCOPED_TSAN_INTERCEPTOR(pthread_spin_trylock, m);
996  int res = REAL(pthread_spin_trylock)(m);
997  if (res == 0) {
998    MutexLock(thr, pc, (uptr)m);
999  }
1000  return res;
1001}
1002
1003TSAN_INTERCEPTOR(int, pthread_spin_unlock, void *m) {
1004  SCOPED_TSAN_INTERCEPTOR(pthread_spin_unlock, m);
1005  MutexUnlock(thr, pc, (uptr)m);
1006  int res = REAL(pthread_spin_unlock)(m);
1007  return res;
1008}
1009
1010TSAN_INTERCEPTOR(int, pthread_rwlock_init, void *m, void *a) {
1011  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_init, m, a);
1012  int res = REAL(pthread_rwlock_init)(m, a);
1013  if (res == 0) {
1014    MutexCreate(thr, pc, (uptr)m, true, false, false);
1015  }
1016  return res;
1017}
1018
1019TSAN_INTERCEPTOR(int, pthread_rwlock_destroy, void *m) {
1020  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_destroy, m);
1021  int res = REAL(pthread_rwlock_destroy)(m);
1022  if (res == 0) {
1023    MutexDestroy(thr, pc, (uptr)m);
1024  }
1025  return res;
1026}
1027
1028TSAN_INTERCEPTOR(int, pthread_rwlock_rdlock, void *m) {
1029  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_rdlock, m);
1030  int res = REAL(pthread_rwlock_rdlock)(m);
1031  if (res == 0) {
1032    MutexReadLock(thr, pc, (uptr)m);
1033  }
1034  return res;
1035}
1036
1037TSAN_INTERCEPTOR(int, pthread_rwlock_tryrdlock, void *m) {
1038  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_tryrdlock, m);
1039  int res = REAL(pthread_rwlock_tryrdlock)(m);
1040  if (res == 0) {
1041    MutexReadLock(thr, pc, (uptr)m);
1042  }
1043  return res;
1044}
1045
1046TSAN_INTERCEPTOR(int, pthread_rwlock_timedrdlock, void *m, void *abstime) {
1047  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedrdlock, m, abstime);
1048  int res = REAL(pthread_rwlock_timedrdlock)(m, abstime);
1049  if (res == 0) {
1050    MutexReadLock(thr, pc, (uptr)m);
1051  }
1052  return res;
1053}
1054
1055TSAN_INTERCEPTOR(int, pthread_rwlock_wrlock, void *m) {
1056  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_wrlock, m);
1057  int res = REAL(pthread_rwlock_wrlock)(m);
1058  if (res == 0) {
1059    MutexLock(thr, pc, (uptr)m);
1060  }
1061  return res;
1062}
1063
1064TSAN_INTERCEPTOR(int, pthread_rwlock_trywrlock, void *m) {
1065  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_trywrlock, m);
1066  int res = REAL(pthread_rwlock_trywrlock)(m);
1067  if (res == 0) {
1068    MutexLock(thr, pc, (uptr)m);
1069  }
1070  return res;
1071}
1072
1073TSAN_INTERCEPTOR(int, pthread_rwlock_timedwrlock, void *m, void *abstime) {
1074  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedwrlock, m, abstime);
1075  int res = REAL(pthread_rwlock_timedwrlock)(m, abstime);
1076  if (res == 0) {
1077    MutexLock(thr, pc, (uptr)m);
1078  }
1079  return res;
1080}
1081
1082TSAN_INTERCEPTOR(int, pthread_rwlock_unlock, void *m) {
1083  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_unlock, m);
1084  MutexReadOrWriteUnlock(thr, pc, (uptr)m);
1085  int res = REAL(pthread_rwlock_unlock)(m);
1086  return res;
1087}
1088
1089TSAN_INTERCEPTOR(int, pthread_cond_init, void *c, void *a) {
1090  SCOPED_TSAN_INTERCEPTOR(pthread_cond_init, c, a);
1091  MemoryWrite(thr, pc, (uptr)c, kSizeLog1);
1092  int res = REAL(pthread_cond_init)(c, a);
1093  return res;
1094}
1095
1096TSAN_INTERCEPTOR(int, pthread_cond_destroy, void *c) {
1097  SCOPED_TSAN_INTERCEPTOR(pthread_cond_destroy, c);
1098  MemoryWrite(thr, pc, (uptr)c, kSizeLog1);
1099  int res = REAL(pthread_cond_destroy)(c);
1100  return res;
1101}
1102
1103TSAN_INTERCEPTOR(int, pthread_cond_signal, void *c) {
1104  SCOPED_TSAN_INTERCEPTOR(pthread_cond_signal, c);
1105  MemoryRead(thr, pc, (uptr)c, kSizeLog1);
1106  int res = REAL(pthread_cond_signal)(c);
1107  return res;
1108}
1109
1110TSAN_INTERCEPTOR(int, pthread_cond_broadcast, void *c) {
1111  SCOPED_TSAN_INTERCEPTOR(pthread_cond_broadcast, c);
1112  MemoryRead(thr, pc, (uptr)c, kSizeLog1);
1113  int res = REAL(pthread_cond_broadcast)(c);
1114  return res;
1115}
1116
1117TSAN_INTERCEPTOR(int, pthread_cond_wait, void *c, void *m) {
1118  SCOPED_TSAN_INTERCEPTOR(pthread_cond_wait, c, m);
1119  MutexUnlock(thr, pc, (uptr)m);
1120  MemoryRead(thr, pc, (uptr)c, kSizeLog1);
1121  int res = REAL(pthread_cond_wait)(c, m);
1122  MutexLock(thr, pc, (uptr)m);
1123  return res;
1124}
1125
1126TSAN_INTERCEPTOR(int, pthread_cond_timedwait, void *c, void *m,
1127    void *abstime) {
1128  SCOPED_TSAN_INTERCEPTOR(pthread_cond_timedwait, c, m, abstime);
1129  MutexUnlock(thr, pc, (uptr)m);
1130  MemoryRead(thr, pc, (uptr)c, kSizeLog1);
1131  int res = REAL(pthread_cond_timedwait)(c, m, abstime);
1132  MutexLock(thr, pc, (uptr)m);
1133  return res;
1134}
1135
1136TSAN_INTERCEPTOR(int, pthread_barrier_init, void *b, void *a, unsigned count) {
1137  SCOPED_TSAN_INTERCEPTOR(pthread_barrier_init, b, a, count);
1138  MemoryWrite(thr, pc, (uptr)b, kSizeLog1);
1139  int res = REAL(pthread_barrier_init)(b, a, count);
1140  return res;
1141}
1142
1143TSAN_INTERCEPTOR(int, pthread_barrier_destroy, void *b) {
1144  SCOPED_TSAN_INTERCEPTOR(pthread_barrier_destroy, b);
1145  MemoryWrite(thr, pc, (uptr)b, kSizeLog1);
1146  int res = REAL(pthread_barrier_destroy)(b);
1147  return res;
1148}
1149
1150TSAN_INTERCEPTOR(int, pthread_barrier_wait, void *b) {
1151  SCOPED_TSAN_INTERCEPTOR(pthread_barrier_wait, b);
1152  Release(thr, pc, (uptr)b);
1153  MemoryRead(thr, pc, (uptr)b, kSizeLog1);
1154  int res = REAL(pthread_barrier_wait)(b);
1155  MemoryRead(thr, pc, (uptr)b, kSizeLog1);
1156  if (res == 0 || res == PTHREAD_BARRIER_SERIAL_THREAD) {
1157    Acquire(thr, pc, (uptr)b);
1158  }
1159  return res;
1160}
1161
1162TSAN_INTERCEPTOR(int, pthread_once, void *o, void (*f)()) {
1163  SCOPED_TSAN_INTERCEPTOR(pthread_once, o, f);
1164  if (o == 0 || f == 0)
1165    return EINVAL;
1166  atomic_uint32_t *a = static_cast<atomic_uint32_t*>(o);
1167  u32 v = atomic_load(a, memory_order_acquire);
1168  if (v == 0 && atomic_compare_exchange_strong(a, &v, 1,
1169                                               memory_order_relaxed)) {
1170    const int old_in_rtl = thr->in_rtl;
1171    thr->in_rtl = 0;
1172    (*f)();
1173    CHECK_EQ(thr->in_rtl, 0);
1174    thr->in_rtl = old_in_rtl;
1175    Release(thr, pc, (uptr)o);
1176    atomic_store(a, 2, memory_order_release);
1177  } else {
1178    while (v != 2) {
1179      pthread_yield();
1180      v = atomic_load(a, memory_order_acquire);
1181    }
1182    Acquire(thr, pc, (uptr)o);
1183  }
1184  return 0;
1185}
1186
1187TSAN_INTERCEPTOR(int, sem_init, void *s, int pshared, unsigned value) {
1188  SCOPED_TSAN_INTERCEPTOR(sem_init, s, pshared, value);
1189  int res = REAL(sem_init)(s, pshared, value);
1190  return res;
1191}
1192
1193TSAN_INTERCEPTOR(int, sem_destroy, void *s) {
1194  SCOPED_TSAN_INTERCEPTOR(sem_destroy, s);
1195  int res = REAL(sem_destroy)(s);
1196  return res;
1197}
1198
1199TSAN_INTERCEPTOR(int, sem_wait, void *s) {
1200  SCOPED_TSAN_INTERCEPTOR(sem_wait, s);
1201  int res = BLOCK_REAL(sem_wait)(s);
1202  if (res == 0) {
1203    Acquire(thr, pc, (uptr)s);
1204  }
1205  return res;
1206}
1207
1208TSAN_INTERCEPTOR(int, sem_trywait, void *s) {
1209  SCOPED_TSAN_INTERCEPTOR(sem_trywait, s);
1210  int res = BLOCK_REAL(sem_trywait)(s);
1211  if (res == 0) {
1212    Acquire(thr, pc, (uptr)s);
1213  }
1214  return res;
1215}
1216
1217TSAN_INTERCEPTOR(int, sem_timedwait, void *s, void *abstime) {
1218  SCOPED_TSAN_INTERCEPTOR(sem_timedwait, s, abstime);
1219  int res = BLOCK_REAL(sem_timedwait)(s, abstime);
1220  if (res == 0) {
1221    Acquire(thr, pc, (uptr)s);
1222  }
1223  return res;
1224}
1225
1226TSAN_INTERCEPTOR(int, sem_post, void *s) {
1227  SCOPED_TSAN_INTERCEPTOR(sem_post, s);
1228  Release(thr, pc, (uptr)s);
1229  int res = REAL(sem_post)(s);
1230  return res;
1231}
1232
1233TSAN_INTERCEPTOR(int, sem_getvalue, void *s, int *sval) {
1234  SCOPED_TSAN_INTERCEPTOR(sem_getvalue, s, sval);
1235  int res = REAL(sem_getvalue)(s, sval);
1236  if (res == 0) {
1237    Acquire(thr, pc, (uptr)s);
1238  }
1239  return res;
1240}
1241
1242TSAN_INTERCEPTOR(int, __xstat, int version, const char *path, void *buf) {
1243  SCOPED_TSAN_INTERCEPTOR(__xstat, version, path, buf);
1244  return REAL(__xstat)(version, path, buf);
1245}
1246
1247TSAN_INTERCEPTOR(int, stat, const char *path, void *buf) {
1248  SCOPED_TSAN_INTERCEPTOR(__xstat, 0, path, buf);
1249  return REAL(__xstat)(0, path, buf);
1250}
1251
1252TSAN_INTERCEPTOR(int, __xstat64, int version, const char *path, void *buf) {
1253  SCOPED_TSAN_INTERCEPTOR(__xstat64, version, path, buf);
1254  return REAL(__xstat64)(version, path, buf);
1255}
1256
1257TSAN_INTERCEPTOR(int, stat64, const char *path, void *buf) {
1258  SCOPED_TSAN_INTERCEPTOR(__xstat64, 0, path, buf);
1259  return REAL(__xstat64)(0, path, buf);
1260}
1261
1262TSAN_INTERCEPTOR(int, __lxstat, int version, const char *path, void *buf) {
1263  SCOPED_TSAN_INTERCEPTOR(__lxstat, version, path, buf);
1264  return REAL(__lxstat)(version, path, buf);
1265}
1266
1267TSAN_INTERCEPTOR(int, lstat, const char *path, void *buf) {
1268  SCOPED_TSAN_INTERCEPTOR(__lxstat, 0, path, buf);
1269  return REAL(__lxstat)(0, path, buf);
1270}
1271
1272TSAN_INTERCEPTOR(int, __lxstat64, int version, const char *path, void *buf) {
1273  SCOPED_TSAN_INTERCEPTOR(__lxstat64, version, path, buf);
1274  return REAL(__lxstat64)(version, path, buf);
1275}
1276
1277TSAN_INTERCEPTOR(int, lstat64, const char *path, void *buf) {
1278  SCOPED_TSAN_INTERCEPTOR(__lxstat64, 0, path, buf);
1279  return REAL(__lxstat64)(0, path, buf);
1280}
1281
1282TSAN_INTERCEPTOR(int, __fxstat, int version, int fd, void *buf) {
1283  SCOPED_TSAN_INTERCEPTOR(__fxstat, version, fd, buf);
1284  if (fd > 0)
1285    FdAccess(thr, pc, fd);
1286  return REAL(__fxstat)(version, fd, buf);
1287}
1288
1289TSAN_INTERCEPTOR(int, fstat, int fd, void *buf) {
1290  SCOPED_TSAN_INTERCEPTOR(__fxstat, 0, fd, buf);
1291  if (fd > 0)
1292    FdAccess(thr, pc, fd);
1293  return REAL(__fxstat)(0, fd, buf);
1294}
1295
1296TSAN_INTERCEPTOR(int, __fxstat64, int version, int fd, void *buf) {
1297  SCOPED_TSAN_INTERCEPTOR(__fxstat64, version, fd, buf);
1298  if (fd > 0)
1299    FdAccess(thr, pc, fd);
1300  return REAL(__fxstat64)(version, fd, buf);
1301}
1302
1303TSAN_INTERCEPTOR(int, fstat64, int fd, void *buf) {
1304  SCOPED_TSAN_INTERCEPTOR(__fxstat64, 0, fd, buf);
1305  if (fd > 0)
1306    FdAccess(thr, pc, fd);
1307  return REAL(__fxstat64)(0, fd, buf);
1308}
1309
1310TSAN_INTERCEPTOR(int, open, const char *name, int flags, int mode) {
1311  SCOPED_TSAN_INTERCEPTOR(open, name, flags, mode);
1312  int fd = REAL(open)(name, flags, mode);
1313  if (fd >= 0)
1314    FdFileCreate(thr, pc, fd);
1315  return fd;
1316}
1317
1318TSAN_INTERCEPTOR(int, open64, const char *name, int flags, int mode) {
1319  SCOPED_TSAN_INTERCEPTOR(open64, name, flags, mode);
1320  int fd = REAL(open64)(name, flags, mode);
1321  if (fd >= 0)
1322    FdFileCreate(thr, pc, fd);
1323  return fd;
1324}
1325
1326TSAN_INTERCEPTOR(int, creat, const char *name, int mode) {
1327  SCOPED_TSAN_INTERCEPTOR(creat, name, mode);
1328  int fd = REAL(creat)(name, mode);
1329  if (fd >= 0)
1330    FdFileCreate(thr, pc, fd);
1331  return fd;
1332}
1333
1334TSAN_INTERCEPTOR(int, creat64, const char *name, int mode) {
1335  SCOPED_TSAN_INTERCEPTOR(creat64, name, mode);
1336  int fd = REAL(creat64)(name, mode);
1337  if (fd >= 0)
1338    FdFileCreate(thr, pc, fd);
1339  return fd;
1340}
1341
1342TSAN_INTERCEPTOR(int, dup, int oldfd) {
1343  SCOPED_TSAN_INTERCEPTOR(dup, oldfd);
1344  int newfd = REAL(dup)(oldfd);
1345  if (oldfd >= 0 && newfd >= 0 && newfd != oldfd)
1346    FdDup(thr, pc, oldfd, newfd);
1347  return newfd;
1348}
1349
1350TSAN_INTERCEPTOR(int, dup2, int oldfd, int newfd) {
1351  SCOPED_TSAN_INTERCEPTOR(dup2, oldfd, newfd);
1352  int newfd2 = REAL(dup2)(oldfd, newfd);
1353  if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
1354    FdDup(thr, pc, oldfd, newfd2);
1355  return newfd2;
1356}
1357
1358TSAN_INTERCEPTOR(int, dup3, int oldfd, int newfd, int flags) {
1359  SCOPED_TSAN_INTERCEPTOR(dup3, oldfd, newfd, flags);
1360  int newfd2 = REAL(dup3)(oldfd, newfd, flags);
1361  if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
1362    FdDup(thr, pc, oldfd, newfd2);
1363  return newfd2;
1364}
1365
1366TSAN_INTERCEPTOR(int, eventfd, unsigned initval, int flags) {
1367  SCOPED_TSAN_INTERCEPTOR(eventfd, initval, flags);
1368  int fd = REAL(eventfd)(initval, flags);
1369  if (fd >= 0)
1370    FdEventCreate(thr, pc, fd);
1371  return fd;
1372}
1373
1374TSAN_INTERCEPTOR(int, signalfd, int fd, void *mask, int flags) {
1375  SCOPED_TSAN_INTERCEPTOR(signalfd, fd, mask, flags);
1376  if (fd >= 0)
1377    FdClose(thr, pc, fd);
1378  fd = REAL(signalfd)(fd, mask, flags);
1379  if (fd >= 0)
1380    FdSignalCreate(thr, pc, fd);
1381  return fd;
1382}
1383
1384TSAN_INTERCEPTOR(int, inotify_init, int fake) {
1385  SCOPED_TSAN_INTERCEPTOR(inotify_init, fake);
1386  int fd = REAL(inotify_init)(fake);
1387  if (fd >= 0)
1388    FdInotifyCreate(thr, pc, fd);
1389  return fd;
1390}
1391
1392TSAN_INTERCEPTOR(int, inotify_init1, int flags) {
1393  SCOPED_TSAN_INTERCEPTOR(inotify_init1, flags);
1394  int fd = REAL(inotify_init1)(flags);
1395  if (fd >= 0)
1396    FdInotifyCreate(thr, pc, fd);
1397  return fd;
1398}
1399
1400TSAN_INTERCEPTOR(int, socket, int domain, int type, int protocol) {
1401  SCOPED_TSAN_INTERCEPTOR(socket, domain, type, protocol);
1402  int fd = REAL(socket)(domain, type, protocol);
1403  if (fd >= 0)
1404    FdSocketCreate(thr, pc, fd);
1405  return fd;
1406}
1407
1408TSAN_INTERCEPTOR(int, socketpair, int domain, int type, int protocol, int *fd) {
1409  SCOPED_TSAN_INTERCEPTOR(socketpair, domain, type, protocol, fd);
1410  int res = REAL(socketpair)(domain, type, protocol, fd);
1411  if (res == 0 && fd[0] >= 0 && fd[1] >= 0)
1412    FdPipeCreate(thr, pc, fd[0], fd[1]);
1413  return res;
1414}
1415
1416TSAN_INTERCEPTOR(int, connect, int fd, void *addr, unsigned addrlen) {
1417  SCOPED_TSAN_INTERCEPTOR(connect, fd, addr, addrlen);
1418  FdSocketConnecting(thr, pc, fd);
1419  int res = REAL(connect)(fd, addr, addrlen);
1420  if (res == 0 && fd >= 0)
1421    FdSocketConnect(thr, pc, fd);
1422  return res;
1423}
1424
1425TSAN_INTERCEPTOR(int, bind, int fd, void *addr, unsigned addrlen) {
1426  SCOPED_TSAN_INTERCEPTOR(bind, fd, addr, addrlen);
1427  int res = REAL(bind)(fd, addr, addrlen);
1428  if (fd > 0 && res == 0)
1429    FdAccess(thr, pc, fd);
1430  return res;
1431}
1432
1433TSAN_INTERCEPTOR(int, listen, int fd, int backlog) {
1434  SCOPED_TSAN_INTERCEPTOR(listen, fd, backlog);
1435  int res = REAL(listen)(fd, backlog);
1436  if (fd > 0 && res == 0)
1437    FdAccess(thr, pc, fd);
1438  return res;
1439}
1440
1441TSAN_INTERCEPTOR(int, epoll_create, int size) {
1442  SCOPED_TSAN_INTERCEPTOR(epoll_create, size);
1443  int fd = REAL(epoll_create)(size);
1444  if (fd >= 0)
1445    FdPollCreate(thr, pc, fd);
1446  return fd;
1447}
1448
1449TSAN_INTERCEPTOR(int, epoll_create1, int flags) {
1450  SCOPED_TSAN_INTERCEPTOR(epoll_create1, flags);
1451  int fd = REAL(epoll_create1)(flags);
1452  if (fd >= 0)
1453    FdPollCreate(thr, pc, fd);
1454  return fd;
1455}
1456
1457TSAN_INTERCEPTOR(int, close, int fd) {
1458  SCOPED_TSAN_INTERCEPTOR(close, fd);
1459  if (fd >= 0)
1460    FdClose(thr, pc, fd);
1461  return REAL(close)(fd);
1462}
1463
1464TSAN_INTERCEPTOR(int, __close, int fd) {
1465  SCOPED_TSAN_INTERCEPTOR(__close, fd);
1466  if (fd >= 0)
1467    FdClose(thr, pc, fd);
1468  return REAL(__close)(fd);
1469}
1470
1471// glibc guts
1472TSAN_INTERCEPTOR(void, __res_iclose, void *state, bool free_addr) {
1473  SCOPED_TSAN_INTERCEPTOR(__res_iclose, state, free_addr);
1474  int fds[64];
1475  int cnt = ExtractResolvFDs(state, fds, ARRAY_SIZE(fds));
1476  for (int i = 0; i < cnt; i++) {
1477    if (fds[i] > 0)
1478      FdClose(thr, pc, fds[i]);
1479  }
1480  REAL(__res_iclose)(state, free_addr);
1481}
1482
1483TSAN_INTERCEPTOR(int, pipe, int *pipefd) {
1484  SCOPED_TSAN_INTERCEPTOR(pipe, pipefd);
1485  int res = REAL(pipe)(pipefd);
1486  if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
1487    FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
1488  return res;
1489}
1490
1491TSAN_INTERCEPTOR(int, pipe2, int *pipefd, int flags) {
1492  SCOPED_TSAN_INTERCEPTOR(pipe2, pipefd, flags);
1493  int res = REAL(pipe2)(pipefd, flags);
1494  if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
1495    FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
1496  return res;
1497}
1498
1499TSAN_INTERCEPTOR(long_t, send, int fd, void *buf, long_t len, int flags) {
1500  SCOPED_TSAN_INTERCEPTOR(send, fd, buf, len, flags);
1501  if (fd >= 0)
1502    FdRelease(thr, pc, fd);
1503  int res = REAL(send)(fd, buf, len, flags);
1504  return res;
1505}
1506
1507TSAN_INTERCEPTOR(long_t, sendmsg, int fd, void *msg, int flags) {
1508  SCOPED_TSAN_INTERCEPTOR(sendmsg, fd, msg, flags);
1509  if (fd >= 0)
1510    FdRelease(thr, pc, fd);
1511  int res = REAL(sendmsg)(fd, msg, flags);
1512  return res;
1513}
1514
1515TSAN_INTERCEPTOR(long_t, recv, int fd, void *buf, long_t len, int flags) {
1516  SCOPED_TSAN_INTERCEPTOR(recv, fd, buf, len, flags);
1517  int res = REAL(recv)(fd, buf, len, flags);
1518  if (res >= 0 && fd >= 0) {
1519    FdAcquire(thr, pc, fd);
1520  }
1521  return res;
1522}
1523
1524TSAN_INTERCEPTOR(int, unlink, char *path) {
1525  SCOPED_TSAN_INTERCEPTOR(unlink, path);
1526  Release(thr, pc, File2addr(path));
1527  int res = REAL(unlink)(path);
1528  return res;
1529}
1530
1531TSAN_INTERCEPTOR(void*, fopen, char *path, char *mode) {
1532  SCOPED_TSAN_INTERCEPTOR(fopen, path, mode);
1533  void *res = REAL(fopen)(path, mode);
1534  Acquire(thr, pc, File2addr(path));
1535  if (res) {
1536    int fd = fileno_unlocked(res);
1537    if (fd >= 0)
1538      FdFileCreate(thr, pc, fd);
1539  }
1540  return res;
1541}
1542
1543TSAN_INTERCEPTOR(void*, freopen, char *path, char *mode, void *stream) {
1544  SCOPED_TSAN_INTERCEPTOR(freopen, path, mode, stream);
1545  if (stream) {
1546    int fd = fileno_unlocked(stream);
1547    if (fd >= 0)
1548      FdClose(thr, pc, fd);
1549  }
1550  void *res = REAL(freopen)(path, mode, stream);
1551  Acquire(thr, pc, File2addr(path));
1552  if (res) {
1553    int fd = fileno_unlocked(res);
1554    if (fd >= 0)
1555      FdFileCreate(thr, pc, fd);
1556  }
1557  return res;
1558}
1559
1560TSAN_INTERCEPTOR(int, fclose, void *stream) {
1561  {
1562    SCOPED_TSAN_INTERCEPTOR(fclose, stream);
1563    if (stream) {
1564      int fd = fileno_unlocked(stream);
1565      if (fd >= 0)
1566        FdClose(thr, pc, fd);
1567    }
1568  }
1569  return REAL(fclose)(stream);
1570}
1571
1572TSAN_INTERCEPTOR(uptr, fread, void *ptr, uptr size, uptr nmemb, void *f) {
1573  {
1574    SCOPED_TSAN_INTERCEPTOR(fread, ptr, size, nmemb, f);
1575    MemoryAccessRange(thr, pc, (uptr)ptr, size * nmemb, true);
1576  }
1577  return REAL(fread)(ptr, size, nmemb, f);
1578}
1579
1580TSAN_INTERCEPTOR(uptr, fwrite, const void *p, uptr size, uptr nmemb, void *f) {
1581  {
1582    SCOPED_TSAN_INTERCEPTOR(fwrite, p, size, nmemb, f);
1583    MemoryAccessRange(thr, pc, (uptr)p, size * nmemb, false);
1584  }
1585  return REAL(fwrite)(p, size, nmemb, f);
1586}
1587
1588TSAN_INTERCEPTOR(int, fflush, void *stream) {
1589  SCOPED_TSAN_INTERCEPTOR(fflush, stream);
1590  return REAL(fflush)(stream);
1591}
1592
1593TSAN_INTERCEPTOR(void, abort, int fake) {
1594  SCOPED_TSAN_INTERCEPTOR(abort, fake);
1595  REAL(fflush)(0);
1596  REAL(abort)(fake);
1597}
1598
1599TSAN_INTERCEPTOR(int, puts, const char *s) {
1600  SCOPED_TSAN_INTERCEPTOR(puts, s);
1601  MemoryAccessRange(thr, pc, (uptr)s, internal_strlen(s), false);
1602  return REAL(puts)(s);
1603}
1604
1605TSAN_INTERCEPTOR(int, rmdir, char *path) {
1606  SCOPED_TSAN_INTERCEPTOR(rmdir, path);
1607  Release(thr, pc, Dir2addr(path));
1608  int res = REAL(rmdir)(path);
1609  return res;
1610}
1611
1612TSAN_INTERCEPTOR(void*, opendir, char *path) {
1613  SCOPED_TSAN_INTERCEPTOR(opendir, path);
1614  void *res = REAL(opendir)(path);
1615  if (res != 0)
1616    Acquire(thr, pc, Dir2addr(path));
1617  return res;
1618}
1619
1620TSAN_INTERCEPTOR(int, epoll_ctl, int epfd, int op, int fd, void *ev) {
1621  SCOPED_TSAN_INTERCEPTOR(epoll_ctl, epfd, op, fd, ev);
1622  if (op == EPOLL_CTL_ADD && epfd >= 0) {
1623    FdRelease(thr, pc, epfd);
1624  }
1625  int res = REAL(epoll_ctl)(epfd, op, fd, ev);
1626  if (fd >= 0)
1627    FdAccess(thr, pc, fd);
1628  return res;
1629}
1630
1631TSAN_INTERCEPTOR(int, epoll_wait, int epfd, void *ev, int cnt, int timeout) {
1632  SCOPED_TSAN_INTERCEPTOR(epoll_wait, epfd, ev, cnt, timeout);
1633  int res = BLOCK_REAL(epoll_wait)(epfd, ev, cnt, timeout);
1634  if (res > 0 && epfd >= 0) {
1635    FdAcquire(thr, pc, epfd);
1636  }
1637  return res;
1638}
1639
1640void ALWAYS_INLINE rtl_generic_sighandler(bool sigact, int sig,
1641    my_siginfo_t *info, void *ctx) {
1642  ThreadState *thr = cur_thread();
1643  SignalContext *sctx = SigCtx(thr);
1644  // Don't mess with synchronous signals.
1645  if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
1646      sig == SIGABRT || sig == SIGFPE || sig == SIGPIPE || sig == SIGSYS ||
1647      // If we are sending signal to ourselves, we must process it now.
1648      (sctx && sig == sctx->int_signal_send) ||
1649      // If we are in blocking function, we can safely process it now
1650      // (but check if we are in a recursive interceptor,
1651      // i.e. pthread_join()->munmap()).
1652      (sctx && sctx->in_blocking_func == 1 && thr->in_rtl == 1)) {
1653    int in_rtl = thr->in_rtl;
1654    thr->in_rtl = 0;
1655    CHECK_EQ(thr->in_signal_handler, false);
1656    thr->in_signal_handler = true;
1657    if (sigact)
1658      sigactions[sig].sa_sigaction(sig, info, ctx);
1659    else
1660      sigactions[sig].sa_handler(sig);
1661    CHECK_EQ(thr->in_signal_handler, true);
1662    thr->in_signal_handler = false;
1663    thr->in_rtl = in_rtl;
1664    return;
1665  }
1666
1667  if (sctx == 0)
1668    return;
1669  SignalDesc *signal = &sctx->pending_signals[sig];
1670  if (signal->armed == false) {
1671    signal->armed = true;
1672    signal->sigaction = sigact;
1673    if (info)
1674      internal_memcpy(&signal->siginfo, info, sizeof(*info));
1675    if (ctx)
1676      internal_memcpy(&signal->ctx, ctx, sizeof(signal->ctx));
1677    sctx->pending_signal_count++;
1678  }
1679}
1680
1681static void rtl_sighandler(int sig) {
1682  rtl_generic_sighandler(false, sig, 0, 0);
1683}
1684
1685static void rtl_sigaction(int sig, my_siginfo_t *info, void *ctx) {
1686  rtl_generic_sighandler(true, sig, info, ctx);
1687}
1688
1689TSAN_INTERCEPTOR(int, sigaction, int sig, sigaction_t *act, sigaction_t *old) {
1690  SCOPED_TSAN_INTERCEPTOR(sigaction, sig, act, old);
1691  if (old)
1692    internal_memcpy(old, &sigactions[sig], sizeof(*old));
1693  if (act == 0)
1694    return 0;
1695  internal_memcpy(&sigactions[sig], act, sizeof(*act));
1696  sigaction_t newact;
1697  internal_memcpy(&newact, act, sizeof(newact));
1698  REAL(sigfillset)(&newact.sa_mask);
1699  if (act->sa_handler != SIG_IGN && act->sa_handler != SIG_DFL) {
1700    if (newact.sa_flags & SA_SIGINFO)
1701      newact.sa_sigaction = rtl_sigaction;
1702    else
1703      newact.sa_handler = rtl_sighandler;
1704  }
1705  int res = REAL(sigaction)(sig, &newact, 0);
1706  return res;
1707}
1708
1709TSAN_INTERCEPTOR(sighandler_t, signal, int sig, sighandler_t h) {
1710  sigaction_t act;
1711  act.sa_handler = h;
1712  REAL(memset)(&act.sa_mask, -1, sizeof(act.sa_mask));
1713  act.sa_flags = 0;
1714  sigaction_t old;
1715  int res = sigaction(sig, &act, &old);
1716  if (res)
1717    return SIG_ERR;
1718  return old.sa_handler;
1719}
1720
1721TSAN_INTERCEPTOR(int, sigsuspend, const __sanitizer_sigset_t *mask) {
1722  SCOPED_TSAN_INTERCEPTOR(sigsuspend, mask);
1723  return REAL(sigsuspend)(mask);
1724}
1725
1726TSAN_INTERCEPTOR(int, raise, int sig) {
1727  SCOPED_TSAN_INTERCEPTOR(raise, sig);
1728  SignalContext *sctx = SigCtx(thr);
1729  CHECK_NE(sctx, 0);
1730  int prev = sctx->int_signal_send;
1731  sctx->int_signal_send = sig;
1732  int res = REAL(raise)(sig);
1733  CHECK_EQ(sctx->int_signal_send, sig);
1734  sctx->int_signal_send = prev;
1735  return res;
1736}
1737
1738TSAN_INTERCEPTOR(int, kill, int pid, int sig) {
1739  SCOPED_TSAN_INTERCEPTOR(kill, pid, sig);
1740  SignalContext *sctx = SigCtx(thr);
1741  CHECK_NE(sctx, 0);
1742  int prev = sctx->int_signal_send;
1743  if (pid == (int)internal_getpid()) {
1744    sctx->int_signal_send = sig;
1745  }
1746  int res = REAL(kill)(pid, sig);
1747  if (pid == (int)internal_getpid()) {
1748    CHECK_EQ(sctx->int_signal_send, sig);
1749    sctx->int_signal_send = prev;
1750  }
1751  return res;
1752}
1753
1754TSAN_INTERCEPTOR(int, pthread_kill, void *tid, int sig) {
1755  SCOPED_TSAN_INTERCEPTOR(pthread_kill, tid, sig);
1756  SignalContext *sctx = SigCtx(thr);
1757  CHECK_NE(sctx, 0);
1758  int prev = sctx->int_signal_send;
1759  if (tid == pthread_self()) {
1760    sctx->int_signal_send = sig;
1761  }
1762  int res = REAL(pthread_kill)(tid, sig);
1763  if (tid == pthread_self()) {
1764    CHECK_EQ(sctx->int_signal_send, sig);
1765    sctx->int_signal_send = prev;
1766  }
1767  return res;
1768}
1769
1770TSAN_INTERCEPTOR(int, gettimeofday, void *tv, void *tz) {
1771  SCOPED_TSAN_INTERCEPTOR(gettimeofday, tv, tz);
1772  // It's intercepted merely to process pending signals.
1773  return REAL(gettimeofday)(tv, tz);
1774}
1775
1776TSAN_INTERCEPTOR(int, getaddrinfo, void *node, void *service,
1777    void *hints, void *rv) {
1778  SCOPED_TSAN_INTERCEPTOR(getaddrinfo, node, service, hints, rv);
1779  // We miss atomic synchronization in getaddrinfo,
1780  // and can report false race between malloc and free
1781  // inside of getaddrinfo. So ignore memory accesses.
1782  ThreadIgnoreBegin(thr);
1783  // getaddrinfo calls fopen, which can be intercepted by user.
1784  thr->in_rtl--;
1785  CHECK_EQ(thr->in_rtl, 0);
1786  int res = REAL(getaddrinfo)(node, service, hints, rv);
1787  thr->in_rtl++;
1788  ThreadIgnoreEnd(thr);
1789  return res;
1790}
1791
1792// Linux kernel has a bug that leads to kernel deadlock if a process
1793// maps TBs of memory and then calls mlock().
1794static void MlockIsUnsupported() {
1795  static atomic_uint8_t printed;
1796  if (atomic_exchange(&printed, 1, memory_order_relaxed))
1797    return;
1798  if (flags()->verbosity > 0)
1799    Printf("INFO: ThreadSanitizer ignores mlock/mlockall/munlock/munlockall\n");
1800}
1801
1802TSAN_INTERCEPTOR(int, mlock, const void *addr, uptr len) {
1803  MlockIsUnsupported();
1804  return 0;
1805}
1806
1807TSAN_INTERCEPTOR(int, munlock, const void *addr, uptr len) {
1808  MlockIsUnsupported();
1809  return 0;
1810}
1811
1812TSAN_INTERCEPTOR(int, mlockall, int flags) {
1813  MlockIsUnsupported();
1814  return 0;
1815}
1816
1817TSAN_INTERCEPTOR(int, munlockall, void) {
1818  MlockIsUnsupported();
1819  return 0;
1820}
1821
1822TSAN_INTERCEPTOR(int, fork, int fake) {
1823  SCOPED_TSAN_INTERCEPTOR(fork, fake);
1824  int pid = REAL(fork)(fake);
1825  if (pid == 0) {
1826    // child
1827    FdOnFork(thr, pc);
1828  } else if (pid > 0) {
1829    // parent
1830  }
1831  return pid;
1832}
1833
1834struct TsanInterceptorContext {
1835  ThreadState *thr;
1836  const uptr caller_pc;
1837  const uptr pc;
1838};
1839
1840#include "sanitizer_common/sanitizer_platform_interceptors.h"
1841// Causes interceptor recursion (getpwuid_r() calls fopen())
1842#undef SANITIZER_INTERCEPT_GETPWNAM_AND_FRIENDS
1843#undef SANITIZER_INTERCEPT_GETPWNAM_R_AND_FRIENDS
1844// Causes interceptor recursion (getaddrinfo() and fopen())
1845#undef SANITIZER_INTERCEPT_GETADDRINFO
1846#undef SANITIZER_INTERCEPT_GETNAMEINFO
1847// Causes interceptor recursion (glob64() calls lstat64())
1848#undef SANITIZER_INTERCEPT_GLOB
1849
1850#define COMMON_INTERCEPTOR_UNPOISON_PARAM(ctx, count) \
1851  do {                                                \
1852  } while (false)
1853#define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size)                    \
1854  MemoryAccessRange(((TsanInterceptorContext *)ctx)->thr,                 \
1855                    ((TsanInterceptorContext *)ctx)->pc, (uptr)ptr, size, \
1856                    true)
1857#define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size)                       \
1858  MemoryAccessRange(((TsanInterceptorContext *) ctx)->thr,                  \
1859                    ((TsanInterceptorContext *) ctx)->pc, (uptr) ptr, size, \
1860                    false)
1861#define COMMON_INTERCEPTOR_ENTER(ctx, func, ...)      \
1862  SCOPED_TSAN_INTERCEPTOR(func, __VA_ARGS__);         \
1863  TsanInterceptorContext _ctx = {thr, caller_pc, pc}; \
1864  ctx = (void *)&_ctx;                                \
1865  (void) ctx;
1866#define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \
1867  FdAcquire(((TsanInterceptorContext *) ctx)->thr, pc, fd)
1868#define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \
1869  FdRelease(((TsanInterceptorContext *) ctx)->thr, pc, fd)
1870#define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd) \
1871  FdSocketAccept(((TsanInterceptorContext *) ctx)->thr, pc, fd, newfd)
1872#define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) \
1873  ThreadSetName(((TsanInterceptorContext *) ctx)->thr, name)
1874#define COMMON_INTERCEPTOR_BLOCK_REAL(name) BLOCK_REAL(name)
1875#include "sanitizer_common/sanitizer_common_interceptors.inc"
1876
1877#define TSAN_SYSCALL() \
1878  ThreadState *thr = cur_thread(); \
1879  ScopedSyscall scoped_syscall(thr) \
1880/**/
1881
1882struct ScopedSyscall {
1883  ThreadState *thr;
1884
1885  explicit ScopedSyscall(ThreadState *thr)
1886      : thr(thr) {
1887    if (thr->in_rtl == 0)
1888      Initialize(thr);
1889    thr->in_rtl++;
1890  }
1891
1892  ~ScopedSyscall() {
1893    thr->in_rtl--;
1894    if (thr->in_rtl == 0)
1895      ProcessPendingSignals(thr);
1896  }
1897};
1898
1899static void syscall_access_range(uptr pc, uptr p, uptr s, bool write) {
1900  TSAN_SYSCALL();
1901  MemoryAccessRange(thr, pc, p, s, write);
1902}
1903
1904static void syscall_fd_close(uptr pc, int fd) {
1905  TSAN_SYSCALL();
1906  if (fd >= 0)
1907    FdClose(thr, pc, fd);
1908}
1909
1910static void syscall_pre_fork(uptr pc) {
1911  TSAN_SYSCALL();
1912}
1913
1914static void syscall_post_fork(uptr pc, int res) {
1915  TSAN_SYSCALL();
1916  if (res == 0) {
1917    // child
1918    FdOnFork(thr, pc);
1919  } else if (res > 0) {
1920    // parent
1921  }
1922}
1923
1924#define COMMON_SYSCALL_PRE_READ_RANGE(p, s) \
1925  syscall_access_range(GET_CALLER_PC(), (uptr)(p), (uptr)(s), false)
1926#define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) \
1927  syscall_access_range(GET_CALLER_PC(), (uptr)(p), (uptr)(s), true)
1928#define COMMON_SYSCALL_POST_READ_RANGE(p, s) \
1929  do { } while (false)
1930#define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) \
1931  do { } while (false)
1932#define COMMON_SYSCALL_FD_CLOSE(fd) \
1933  syscall_fd_close(GET_CALLER_PC(), fd)
1934#define COMMON_SYSCALL_PRE_FORK() \
1935  syscall_pre_fork(GET_CALLER_PC())
1936#define COMMON_SYSCALL_POST_FORK(res) \
1937  syscall_post_fork(GET_CALLER_PC(), res)
1938#include "sanitizer_common/sanitizer_common_syscalls.inc"
1939
1940namespace __tsan {
1941
1942void ProcessPendingSignals(ThreadState *thr) {
1943  CHECK_EQ(thr->in_rtl, 0);
1944  SignalContext *sctx = SigCtx(thr);
1945  if (sctx == 0 || sctx->pending_signal_count == 0 || thr->in_signal_handler)
1946    return;
1947  Context *ctx = CTX();
1948  thr->in_signal_handler = true;
1949  sctx->pending_signal_count = 0;
1950  // These are too big for stack.
1951  static THREADLOCAL __sanitizer_sigset_t emptyset, oldset;
1952  REAL(sigfillset)(&emptyset);
1953  pthread_sigmask(SIG_SETMASK, &emptyset, &oldset);
1954  for (int sig = 0; sig < kSigCount; sig++) {
1955    SignalDesc *signal = &sctx->pending_signals[sig];
1956    if (signal->armed) {
1957      signal->armed = false;
1958      if (sigactions[sig].sa_handler != SIG_DFL
1959          && sigactions[sig].sa_handler != SIG_IGN) {
1960        // Insure that the handler does not spoil errno.
1961        const int saved_errno = errno;
1962        errno = 0;
1963        if (signal->sigaction)
1964          sigactions[sig].sa_sigaction(sig, &signal->siginfo, &signal->ctx);
1965        else
1966          sigactions[sig].sa_handler(sig);
1967        if (flags()->report_bugs && errno != 0) {
1968          ScopedInRtl in_rtl;
1969          __tsan::StackTrace stack;
1970          uptr pc = signal->sigaction ?
1971              (uptr)sigactions[sig].sa_sigaction :
1972              (uptr)sigactions[sig].sa_handler;
1973          pc += 1;  // return address is expected, OutputReport() will undo this
1974          stack.Init(&pc, 1);
1975          ThreadRegistryLock l(ctx->thread_registry);
1976          ScopedReport rep(ReportTypeErrnoInSignal);
1977          if (!IsFiredSuppression(ctx, rep, stack)) {
1978            rep.AddStack(&stack);
1979            OutputReport(ctx, rep, rep.GetReport()->stacks[0]);
1980          }
1981        }
1982        errno = saved_errno;
1983      }
1984    }
1985  }
1986  pthread_sigmask(SIG_SETMASK, &oldset, 0);
1987  CHECK_EQ(thr->in_signal_handler, true);
1988  thr->in_signal_handler = false;
1989}
1990
1991static void finalize(void *arg) {
1992  ThreadState * thr = cur_thread();
1993  uptr pc = 0;
1994  atexit_ctx->exit(thr, pc);
1995  int status = Finalize(cur_thread());
1996  REAL(fflush)(0);
1997  if (status)
1998    _exit(status);
1999}
2000
2001static void unreachable() {
2002  Printf("FATAL: ThreadSanitizer: unreachable called\n");
2003  Die();
2004}
2005
2006void InitializeInterceptors() {
2007  CHECK_GT(cur_thread()->in_rtl, 0);
2008
2009  // We need to setup it early, because functions like dlsym() can call it.
2010  REAL(memset) = internal_memset;
2011  REAL(memcpy) = internal_memcpy;
2012  REAL(memcmp) = internal_memcmp;
2013
2014  // Instruct libc malloc to consume less memory.
2015  mallopt(1, 0);  // M_MXFAST
2016  mallopt(-3, 32*1024);  // M_MMAP_THRESHOLD
2017
2018  SANITIZER_COMMON_INTERCEPTORS_INIT;
2019
2020  TSAN_INTERCEPT(setjmp);
2021  TSAN_INTERCEPT(_setjmp);
2022  TSAN_INTERCEPT(sigsetjmp);
2023  TSAN_INTERCEPT(__sigsetjmp);
2024  TSAN_INTERCEPT(longjmp);
2025  TSAN_INTERCEPT(siglongjmp);
2026
2027  TSAN_INTERCEPT(malloc);
2028  TSAN_INTERCEPT(__libc_memalign);
2029  TSAN_INTERCEPT(calloc);
2030  TSAN_INTERCEPT(realloc);
2031  TSAN_INTERCEPT(free);
2032  TSAN_INTERCEPT(cfree);
2033  TSAN_INTERCEPT(mmap);
2034  TSAN_INTERCEPT(mmap64);
2035  TSAN_INTERCEPT(munmap);
2036  TSAN_INTERCEPT(memalign);
2037  TSAN_INTERCEPT(valloc);
2038  TSAN_INTERCEPT(pvalloc);
2039  TSAN_INTERCEPT(posix_memalign);
2040
2041  TSAN_INTERCEPT(strlen);
2042  TSAN_INTERCEPT(memset);
2043  TSAN_INTERCEPT(memcpy);
2044  TSAN_INTERCEPT(memchr);
2045  TSAN_INTERCEPT(memrchr);
2046  TSAN_INTERCEPT(memmove);
2047  TSAN_INTERCEPT(memcmp);
2048  TSAN_INTERCEPT(strchr);
2049  TSAN_INTERCEPT(strchrnul);
2050  TSAN_INTERCEPT(strrchr);
2051  TSAN_INTERCEPT(strcpy);  // NOLINT
2052  TSAN_INTERCEPT(strncpy);
2053  TSAN_INTERCEPT(strstr);
2054  TSAN_INTERCEPT(strdup);
2055
2056  TSAN_INTERCEPT(pthread_create);
2057  TSAN_INTERCEPT(pthread_join);
2058  TSAN_INTERCEPT(pthread_detach);
2059
2060  TSAN_INTERCEPT(pthread_mutex_init);
2061  TSAN_INTERCEPT(pthread_mutex_destroy);
2062  TSAN_INTERCEPT(pthread_mutex_lock);
2063  TSAN_INTERCEPT(pthread_mutex_trylock);
2064  TSAN_INTERCEPT(pthread_mutex_timedlock);
2065  TSAN_INTERCEPT(pthread_mutex_unlock);
2066
2067  TSAN_INTERCEPT(pthread_spin_init);
2068  TSAN_INTERCEPT(pthread_spin_destroy);
2069  TSAN_INTERCEPT(pthread_spin_lock);
2070  TSAN_INTERCEPT(pthread_spin_trylock);
2071  TSAN_INTERCEPT(pthread_spin_unlock);
2072
2073  TSAN_INTERCEPT(pthread_rwlock_init);
2074  TSAN_INTERCEPT(pthread_rwlock_destroy);
2075  TSAN_INTERCEPT(pthread_rwlock_rdlock);
2076  TSAN_INTERCEPT(pthread_rwlock_tryrdlock);
2077  TSAN_INTERCEPT(pthread_rwlock_timedrdlock);
2078  TSAN_INTERCEPT(pthread_rwlock_wrlock);
2079  TSAN_INTERCEPT(pthread_rwlock_trywrlock);
2080  TSAN_INTERCEPT(pthread_rwlock_timedwrlock);
2081  TSAN_INTERCEPT(pthread_rwlock_unlock);
2082
2083  INTERCEPT_FUNCTION_VER(pthread_cond_init, GLIBC_2.3.2);
2084  INTERCEPT_FUNCTION_VER(pthread_cond_destroy, GLIBC_2.3.2);
2085  INTERCEPT_FUNCTION_VER(pthread_cond_signal, GLIBC_2.3.2);
2086  INTERCEPT_FUNCTION_VER(pthread_cond_broadcast, GLIBC_2.3.2);
2087  INTERCEPT_FUNCTION_VER(pthread_cond_wait, GLIBC_2.3.2);
2088  INTERCEPT_FUNCTION_VER(pthread_cond_timedwait, GLIBC_2.3.2);
2089
2090  TSAN_INTERCEPT(pthread_barrier_init);
2091  TSAN_INTERCEPT(pthread_barrier_destroy);
2092  TSAN_INTERCEPT(pthread_barrier_wait);
2093
2094  TSAN_INTERCEPT(pthread_once);
2095
2096  TSAN_INTERCEPT(sem_init);
2097  TSAN_INTERCEPT(sem_destroy);
2098  TSAN_INTERCEPT(sem_wait);
2099  TSAN_INTERCEPT(sem_trywait);
2100  TSAN_INTERCEPT(sem_timedwait);
2101  TSAN_INTERCEPT(sem_post);
2102  TSAN_INTERCEPT(sem_getvalue);
2103
2104  TSAN_INTERCEPT(stat);
2105  TSAN_INTERCEPT(__xstat);
2106  TSAN_INTERCEPT(stat64);
2107  TSAN_INTERCEPT(__xstat64);
2108  TSAN_INTERCEPT(lstat);
2109  TSAN_INTERCEPT(__lxstat);
2110  TSAN_INTERCEPT(lstat64);
2111  TSAN_INTERCEPT(__lxstat64);
2112  TSAN_INTERCEPT(fstat);
2113  TSAN_INTERCEPT(__fxstat);
2114  TSAN_INTERCEPT(fstat64);
2115  TSAN_INTERCEPT(__fxstat64);
2116  TSAN_INTERCEPT(open);
2117  TSAN_INTERCEPT(open64);
2118  TSAN_INTERCEPT(creat);
2119  TSAN_INTERCEPT(creat64);
2120  TSAN_INTERCEPT(dup);
2121  TSAN_INTERCEPT(dup2);
2122  TSAN_INTERCEPT(dup3);
2123  TSAN_INTERCEPT(eventfd);
2124  TSAN_INTERCEPT(signalfd);
2125  TSAN_INTERCEPT(inotify_init);
2126  TSAN_INTERCEPT(inotify_init1);
2127  TSAN_INTERCEPT(socket);
2128  TSAN_INTERCEPT(socketpair);
2129  TSAN_INTERCEPT(connect);
2130  TSAN_INTERCEPT(bind);
2131  TSAN_INTERCEPT(listen);
2132  TSAN_INTERCEPT(epoll_create);
2133  TSAN_INTERCEPT(epoll_create1);
2134  TSAN_INTERCEPT(close);
2135  TSAN_INTERCEPT(__close);
2136  TSAN_INTERCEPT(__res_iclose);
2137  TSAN_INTERCEPT(pipe);
2138  TSAN_INTERCEPT(pipe2);
2139
2140  TSAN_INTERCEPT(send);
2141  TSAN_INTERCEPT(sendmsg);
2142  TSAN_INTERCEPT(recv);
2143
2144  TSAN_INTERCEPT(unlink);
2145  TSAN_INTERCEPT(fopen);
2146  TSAN_INTERCEPT(freopen);
2147  TSAN_INTERCEPT(fclose);
2148  TSAN_INTERCEPT(fread);
2149  TSAN_INTERCEPT(fwrite);
2150  TSAN_INTERCEPT(fflush);
2151  TSAN_INTERCEPT(abort);
2152  TSAN_INTERCEPT(puts);
2153  TSAN_INTERCEPT(rmdir);
2154  TSAN_INTERCEPT(opendir);
2155
2156  TSAN_INTERCEPT(epoll_ctl);
2157  TSAN_INTERCEPT(epoll_wait);
2158
2159  TSAN_INTERCEPT(sigaction);
2160  TSAN_INTERCEPT(signal);
2161  TSAN_INTERCEPT(sigsuspend);
2162  TSAN_INTERCEPT(raise);
2163  TSAN_INTERCEPT(kill);
2164  TSAN_INTERCEPT(pthread_kill);
2165  TSAN_INTERCEPT(sleep);
2166  TSAN_INTERCEPT(usleep);
2167  TSAN_INTERCEPT(nanosleep);
2168  TSAN_INTERCEPT(gettimeofday);
2169  TSAN_INTERCEPT(getaddrinfo);
2170
2171  TSAN_INTERCEPT(mlock);
2172  TSAN_INTERCEPT(munlock);
2173  TSAN_INTERCEPT(mlockall);
2174  TSAN_INTERCEPT(munlockall);
2175
2176  TSAN_INTERCEPT(fork);
2177  TSAN_INTERCEPT(on_exit);
2178  TSAN_INTERCEPT(__cxa_atexit);
2179
2180  // Need to setup it, because interceptors check that the function is resolved.
2181  // But atexit is emitted directly into the module, so can't be resolved.
2182  REAL(atexit) = (int(*)(void(*)()))unreachable;
2183  atexit_ctx = new(internal_alloc(MBlockAtExit, sizeof(AtExitContext)))
2184      AtExitContext();
2185
2186  if (REAL(__cxa_atexit)(&finalize, 0, 0)) {
2187    Printf("ThreadSanitizer: failed to setup atexit callback\n");
2188    Die();
2189  }
2190
2191  if (pthread_key_create(&g_thread_finalize_key, &thread_finalize)) {
2192    Printf("ThreadSanitizer: failed to create thread key\n");
2193    Die();
2194  }
2195
2196  FdInit();
2197}
2198
2199void internal_start_thread(void(*func)(void *arg), void *arg) {
2200  void *th;
2201  REAL(pthread_create)(&th, 0, (void*(*)(void *arg))func, arg);
2202  REAL(pthread_detach)(th);
2203}
2204
2205}  // namespace __tsan
2206