tsan_interceptors.cc revision 39fa68e4076f6a86765ddc69c44bcecb804f0b53 
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 sigset_t {
39  // The size is determined by looking at sizeof of real sigset_t on linux.
40  u64 val[128 / sizeof(u64)];
41};
42
43struct ucontext_t {
44  // The size is determined by looking at sizeof of real ucontext_t on linux.
45  u64 opaque[936 / sizeof(u64) + 1];
46};
47
48extern "C" int pthread_attr_init(void *attr);
49extern "C" int pthread_attr_destroy(void *attr);
50extern "C" int pthread_attr_getdetachstate(void *attr, int *v);
51extern "C" int pthread_attr_setstacksize(void *attr, uptr stacksize);
52extern "C" int pthread_attr_getstacksize(void *attr, uptr *stacksize);
53extern "C" int pthread_key_create(unsigned *key, void (*destructor)(void* v));
54extern "C" int pthread_setspecific(unsigned key, const void *v);
55extern "C" int pthread_mutexattr_gettype(void *a, int *type);
56extern "C" int pthread_yield();
57extern "C" int pthread_sigmask(int how, const sigset_t *set, sigset_t *oldset);
58extern "C" int sigfillset(sigset_t *set);
59extern "C" void *pthread_self();
60extern "C" void _exit(int status);
61extern "C" int *__errno_location();
62extern "C" int fileno_unlocked(void *stream);
63extern "C" void *__libc_malloc(uptr size);
64extern "C" void *__libc_calloc(uptr size, uptr n);
65extern "C" void *__libc_realloc(void *ptr, uptr size);
66extern "C" void __libc_free(void *ptr);
67extern "C" int mallopt(int param, int value);
68const int PTHREAD_MUTEX_RECURSIVE = 1;
69const int PTHREAD_MUTEX_RECURSIVE_NP = 1;
70const int EINVAL = 22;
71const int EBUSY = 16;
72const int EPOLL_CTL_ADD = 1;
73const int SIGILL = 4;
74const int SIGABRT = 6;
75const int SIGFPE = 8;
76const int SIGSEGV = 11;
77const int SIGPIPE = 13;
78const int SIGBUS = 7;
79const int SIGSYS = 31;
80void *const MAP_FAILED = (void*)-1;
81const int PTHREAD_BARRIER_SERIAL_THREAD = -1;
82const int MAP_FIXED = 0x10;
83typedef long long_t;  // NOLINT
84
85// From /usr/include/unistd.h
86# define F_ULOCK 0      /* Unlock a previously locked region.  */
87# define F_LOCK  1      /* Lock a region for exclusive use.  */
88# define F_TLOCK 2      /* Test and lock a region for exclusive use.  */
89# define F_TEST  3      /* Test a region for other processes locks.  */
90
91typedef void (*sighandler_t)(int sig);
92
93#define errno (*__errno_location())
94
95struct sigaction_t {
96  union {
97    sighandler_t sa_handler;
98    void (*sa_sigaction)(int sig, my_siginfo_t *siginfo, void *uctx);
99  };
100  sigset_t sa_mask;
101  int sa_flags;
102  void (*sa_restorer)();
103};
104
105const sighandler_t SIG_DFL = (sighandler_t)0;
106const sighandler_t SIG_IGN = (sighandler_t)1;
107const sighandler_t SIG_ERR = (sighandler_t)-1;
108const int SA_SIGINFO = 4;
109const int SIG_SETMASK = 2;
110
111namespace std {
112struct nothrow_t {};
113}  // namespace std
114
115static sigaction_t sigactions[kSigCount];
116
117namespace __tsan {
118struct SignalDesc {
119  bool armed;
120  bool sigaction;
121  my_siginfo_t siginfo;
122  ucontext_t ctx;
123};
124
125struct SignalContext {
126  int in_blocking_func;
127  int int_signal_send;
128  int pending_signal_count;
129  SignalDesc pending_signals[kSigCount];
130};
131
132// Used to ignore interceptors coming directly from libjvm.so.
133atomic_uintptr_t libjvm_begin;
134atomic_uintptr_t libjvm_end;
135
136static bool libjvm_check(uptr pc) {
137  uptr begin = atomic_load(&libjvm_begin, memory_order_relaxed);
138  if (begin != 0 && pc >= begin) {
139    uptr end = atomic_load(&libjvm_end, memory_order_relaxed);
140    if (end != 0 && pc < end)
141      return true;
142  }
143  return false;
144}
145
146}  // namespace __tsan
147
148static SignalContext *SigCtx(ThreadState *thr) {
149  SignalContext *ctx = (SignalContext*)thr->signal_ctx;
150  if (ctx == 0 && thr->is_alive) {
151    ScopedInRtl in_rtl;
152    ctx = (SignalContext*)MmapOrDie(sizeof(*ctx), "SignalContext");
153    MemoryResetRange(thr, (uptr)&SigCtx, (uptr)ctx, sizeof(*ctx));
154    thr->signal_ctx = ctx;
155  }
156  return ctx;
157}
158
159static unsigned g_thread_finalize_key;
160
161class ScopedInterceptor {
162 public:
163  ScopedInterceptor(ThreadState *thr, const char *fname, uptr pc);
164  ~ScopedInterceptor();
165 private:
166  ThreadState *const thr_;
167  const int in_rtl_;
168};
169
170ScopedInterceptor::ScopedInterceptor(ThreadState *thr, const char *fname,
171                                     uptr pc)
172    : thr_(thr)
173    , in_rtl_(thr->in_rtl) {
174  if (thr_->in_rtl == 0) {
175    Initialize(thr);
176    FuncEntry(thr, pc);
177    thr_->in_rtl++;
178    DPrintf("#%d: intercept %s()\n", thr_->tid, fname);
179  } else {
180    thr_->in_rtl++;
181  }
182}
183
184ScopedInterceptor::~ScopedInterceptor() {
185  thr_->in_rtl--;
186  if (thr_->in_rtl == 0) {
187    FuncExit(thr_);
188    ProcessPendingSignals(thr_);
189  }
190  CHECK_EQ(in_rtl_, thr_->in_rtl);
191}
192
193#define SCOPED_INTERCEPTOR_RAW(func, ...) \
194    ThreadState *thr = cur_thread(); \
195    StatInc(thr, StatInterceptor); \
196    StatInc(thr, StatInt_##func); \
197    const uptr caller_pc = GET_CALLER_PC(); \
198    ScopedInterceptor si(thr, #func, caller_pc); \
199    const uptr pc = __sanitizer::StackTrace::GetCurrentPc(); \
200    (void)pc; \
201/**/
202
203#define SCOPED_TSAN_INTERCEPTOR(func, ...) \
204    SCOPED_INTERCEPTOR_RAW(func, __VA_ARGS__); \
205    if (REAL(func) == 0) { \
206      Printf("FATAL: ThreadSanitizer: failed to intercept %s\n", #func); \
207      Die(); \
208    } \
209    if (thr->in_rtl > 1 || libjvm_check(pc)) \
210      return REAL(func)(__VA_ARGS__); \
211/**/
212
213#define TSAN_INTERCEPTOR(ret, func, ...) INTERCEPTOR(ret, func, __VA_ARGS__)
214#define TSAN_INTERCEPT(func) INTERCEPT_FUNCTION(func)
215
216#define BLOCK_REAL(name) (BlockingCall(thr), REAL(name))
217
218struct BlockingCall {
219  explicit BlockingCall(ThreadState *thr)
220      : ctx(SigCtx(thr)) {
221    ctx->in_blocking_func++;
222  }
223
224  ~BlockingCall() {
225    ctx->in_blocking_func--;
226  }
227
228  SignalContext *ctx;
229};
230
231TSAN_INTERCEPTOR(unsigned, sleep, unsigned sec) {
232  SCOPED_TSAN_INTERCEPTOR(sleep, sec);
233  unsigned res = BLOCK_REAL(sleep)(sec);
234  AfterSleep(thr, pc);
235  return res;
236}
237
238TSAN_INTERCEPTOR(int, usleep, long_t usec) {
239  SCOPED_TSAN_INTERCEPTOR(usleep, usec);
240  int res = BLOCK_REAL(usleep)(usec);
241  AfterSleep(thr, pc);
242  return res;
243}
244
245TSAN_INTERCEPTOR(int, nanosleep, void *req, void *rem) {
246  SCOPED_TSAN_INTERCEPTOR(nanosleep, req, rem);
247  int res = BLOCK_REAL(nanosleep)(req, rem);
248  AfterSleep(thr, pc);
249  return res;
250}
251
252class AtExitContext {
253 public:
254  AtExitContext()
255    : mtx_(MutexTypeAtExit, StatMtxAtExit)
256    , pos_() {
257  }
258
259  typedef void(*atexit_t)();
260
261  int atexit(ThreadState *thr, uptr pc, bool is_on_exit,
262             atexit_t f, void *arg) {
263    Lock l(&mtx_);
264    if (pos_ == kMaxAtExit)
265      return 1;
266    Release(thr, pc, (uptr)this);
267    stack_[pos_] = f;
268    args_[pos_] = arg;
269    is_on_exits_[pos_] = is_on_exit;
270    pos_++;
271    return 0;
272  }
273
274  void exit(ThreadState *thr, uptr pc) {
275    CHECK_EQ(thr->in_rtl, 0);
276    for (;;) {
277      atexit_t f = 0;
278      void *arg = 0;
279      bool is_on_exit = false;
280      {
281        Lock l(&mtx_);
282        if (pos_) {
283          pos_--;
284          f = stack_[pos_];
285          arg = args_[pos_];
286          is_on_exit = is_on_exits_[pos_];
287          ScopedInRtl in_rtl;
288          Acquire(thr, pc, (uptr)this);
289        }
290      }
291      if (f == 0)
292        break;
293      DPrintf("#%d: executing atexit func %p\n", thr->tid, f);
294      CHECK_EQ(thr->in_rtl, 0);
295      if (is_on_exit)
296        ((void(*)(int status, void *arg))f)(0, arg);
297      else
298        ((void(*)(void *arg, void *dso))f)(arg, 0);
299    }
300  }
301
302 private:
303  static const int kMaxAtExit = 128;
304  Mutex mtx_;
305  atexit_t stack_[kMaxAtExit];
306  void *args_[kMaxAtExit];
307  bool is_on_exits_[kMaxAtExit];
308  int pos_;
309};
310
311static AtExitContext *atexit_ctx;
312
313TSAN_INTERCEPTOR(int, atexit, void (*f)()) {
314  if (cur_thread()->in_symbolizer)
315    return 0;
316  SCOPED_TSAN_INTERCEPTOR(atexit, f);
317  return atexit_ctx->atexit(thr, pc, false, (void(*)())f, 0);
318}
319
320TSAN_INTERCEPTOR(int, on_exit, void(*f)(int, void*), void *arg) {
321  if (cur_thread()->in_symbolizer)
322    return 0;
323  SCOPED_TSAN_INTERCEPTOR(on_exit, f, arg);
324  return atexit_ctx->atexit(thr, pc, true, (void(*)())f, arg);
325}
326
327TSAN_INTERCEPTOR(int, __cxa_atexit, void (*f)(void *a), void *arg, void *dso) {
328  if (cur_thread()->in_symbolizer)
329    return 0;
330  SCOPED_TSAN_INTERCEPTOR(__cxa_atexit, f, arg, dso);
331  if (dso) {
332    // Memory allocation in __cxa_atexit will race with free during exit,
333    // because we do not see synchronization around atexit callback list.
334    ThreadIgnoreBegin(thr);
335    int res = REAL(__cxa_atexit)(f, arg, dso);
336    ThreadIgnoreEnd(thr);
337    return res;
338  }
339  return atexit_ctx->atexit(thr, pc, false, (void(*)())f, arg);
340}
341
342// Cleanup old bufs.
343static void JmpBufGarbageCollect(ThreadState *thr, uptr sp) {
344  for (uptr i = 0; i < thr->jmp_bufs.Size(); i++) {
345    JmpBuf *buf = &thr->jmp_bufs[i];
346    if (buf->sp <= sp) {
347      uptr sz = thr->jmp_bufs.Size();
348      thr->jmp_bufs[i] = thr->jmp_bufs[sz - 1];
349      thr->jmp_bufs.PopBack();
350      i--;
351    }
352  }
353}
354
355static void SetJmp(ThreadState *thr, uptr sp, uptr mangled_sp) {
356  if (thr->shadow_stack_pos == 0)  // called from libc guts during bootstrap
357    return;
358  // Cleanup old bufs.
359  JmpBufGarbageCollect(thr, sp);
360  // Remember the buf.
361  JmpBuf *buf = thr->jmp_bufs.PushBack();
362  buf->sp = sp;
363  buf->mangled_sp = mangled_sp;
364  buf->shadow_stack_pos = thr->shadow_stack_pos;
365}
366
367static void LongJmp(ThreadState *thr, uptr *env) {
368  uptr mangled_sp = env[6];
369  // Find the saved buf by mangled_sp.
370  for (uptr i = 0; i < thr->jmp_bufs.Size(); i++) {
371    JmpBuf *buf = &thr->jmp_bufs[i];
372    if (buf->mangled_sp == mangled_sp) {
373      CHECK_GE(thr->shadow_stack_pos, buf->shadow_stack_pos);
374      // Unwind the stack.
375      while (thr->shadow_stack_pos > buf->shadow_stack_pos)
376        FuncExit(thr);
377      JmpBufGarbageCollect(thr, buf->sp - 1);  // do not collect buf->sp
378      return;
379    }
380  }
381  Printf("ThreadSanitizer: can't find longjmp buf\n");
382  CHECK(0);
383}
384
385// FIXME: put everything below into a common extern "C" block?
386extern "C" void __tsan_setjmp(uptr sp, uptr mangled_sp) {
387  ScopedInRtl in_rtl;
388  SetJmp(cur_thread(), sp, mangled_sp);
389}
390
391// Not called.  Merely to satisfy TSAN_INTERCEPT().
392extern "C" SANITIZER_INTERFACE_ATTRIBUTE
393int __interceptor_setjmp(void *env);
394extern "C" int __interceptor_setjmp(void *env) {
395  CHECK(0);
396  return 0;
397}
398
399// FIXME: any reason to have a separate declaration?
400extern "C" SANITIZER_INTERFACE_ATTRIBUTE
401int __interceptor__setjmp(void *env);
402extern "C" int __interceptor__setjmp(void *env) {
403  CHECK(0);
404  return 0;
405}
406
407extern "C" SANITIZER_INTERFACE_ATTRIBUTE
408int __interceptor_sigsetjmp(void *env);
409extern "C" int __interceptor_sigsetjmp(void *env) {
410  CHECK(0);
411  return 0;
412}
413
414extern "C" SANITIZER_INTERFACE_ATTRIBUTE
415int __interceptor___sigsetjmp(void *env);
416extern "C" int __interceptor___sigsetjmp(void *env) {
417  CHECK(0);
418  return 0;
419}
420
421extern "C" int setjmp(void *env);
422extern "C" int _setjmp(void *env);
423extern "C" int sigsetjmp(void *env);
424extern "C" int __sigsetjmp(void *env);
425DEFINE_REAL(int, setjmp, void *env)
426DEFINE_REAL(int, _setjmp, void *env)
427DEFINE_REAL(int, sigsetjmp, void *env)
428DEFINE_REAL(int, __sigsetjmp, void *env)
429
430TSAN_INTERCEPTOR(void, longjmp, uptr *env, int val) {
431  {
432    SCOPED_TSAN_INTERCEPTOR(longjmp, env, val);
433  }
434  LongJmp(cur_thread(), env);
435  REAL(longjmp)(env, val);
436}
437
438TSAN_INTERCEPTOR(void, siglongjmp, uptr *env, int val) {
439  {
440    SCOPED_TSAN_INTERCEPTOR(siglongjmp, env, val);
441  }
442  LongJmp(cur_thread(), env);
443  REAL(siglongjmp)(env, val);
444}
445
446TSAN_INTERCEPTOR(void*, malloc, uptr size) {
447  if (cur_thread()->in_symbolizer || libjvm_check(GET_CALLER_PC()))
448    return __libc_malloc(size);
449  void *p = 0;
450  {
451    SCOPED_INTERCEPTOR_RAW(malloc, size);
452    p = user_alloc(thr, pc, size);
453  }
454  invoke_malloc_hook(p, size);
455  return p;
456}
457
458TSAN_INTERCEPTOR(void*, __libc_memalign, uptr align, uptr sz) {
459  SCOPED_TSAN_INTERCEPTOR(__libc_memalign, align, sz);
460  return user_alloc(thr, pc, sz, align);
461}
462
463TSAN_INTERCEPTOR(void*, calloc, uptr size, uptr n) {
464  if (cur_thread()->in_symbolizer || libjvm_check(GET_CALLER_PC()))
465    return __libc_calloc(size, n);
466  if (__sanitizer::CallocShouldReturnNullDueToOverflow(size, n))
467    return AllocatorReturnNull();
468  void *p = 0;
469  {
470    SCOPED_INTERCEPTOR_RAW(calloc, size, n);
471    p = user_alloc(thr, pc, n * size);
472    if (p)
473      internal_memset(p, 0, n * size);
474  }
475  invoke_malloc_hook(p, n * size);
476  return p;
477}
478
479TSAN_INTERCEPTOR(void*, realloc, void *p, uptr size) {
480  if (cur_thread()->in_symbolizer || libjvm_check(GET_CALLER_PC()))
481    return __libc_realloc(p, size);
482  if (p)
483    invoke_free_hook(p);
484  {
485    SCOPED_INTERCEPTOR_RAW(realloc, p, size);
486    p = user_realloc(thr, pc, p, size);
487  }
488  invoke_malloc_hook(p, size);
489  return p;
490}
491
492TSAN_INTERCEPTOR(void, free, void *p) {
493  if (p == 0)
494    return;
495  if (cur_thread()->in_symbolizer || libjvm_check(GET_CALLER_PC()))
496    return __libc_free(p);
497  invoke_free_hook(p);
498  SCOPED_INTERCEPTOR_RAW(free, p);
499  user_free(thr, pc, p);
500}
501
502TSAN_INTERCEPTOR(void, cfree, void *p) {
503  if (p == 0)
504    return;
505  if (cur_thread()->in_symbolizer || libjvm_check(GET_CALLER_PC()))
506    return __libc_free(p);
507  invoke_free_hook(p);
508  SCOPED_INTERCEPTOR_RAW(cfree, p);
509  user_free(thr, pc, p);
510}
511
512TSAN_INTERCEPTOR(uptr, malloc_usable_size, void *p) {
513  SCOPED_INTERCEPTOR_RAW(malloc_usable_size, p);
514  if (libjvm_check(pc))
515    return malloc_usable_size(p);
516  return user_alloc_usable_size(thr, pc, p);
517}
518
519#define OPERATOR_NEW_BODY(mangled_name) \
520  if (cur_thread()->in_symbolizer || libjvm_check(GET_CALLER_PC())) \
521    return __libc_malloc(size); \
522  void *p = 0; \
523  {  \
524    SCOPED_INTERCEPTOR_RAW(mangled_name, size); \
525    p = user_alloc(thr, pc, size); \
526  }  \
527  invoke_malloc_hook(p, size);  \
528  return p;
529
530SANITIZER_INTERFACE_ATTRIBUTE
531void *operator new(__sanitizer::uptr size);
532void *operator new(__sanitizer::uptr size) {
533  OPERATOR_NEW_BODY(_Znwm);
534}
535
536SANITIZER_INTERFACE_ATTRIBUTE
537void *operator new[](__sanitizer::uptr size);
538void *operator new[](__sanitizer::uptr size) {
539  OPERATOR_NEW_BODY(_Znam);
540}
541
542SANITIZER_INTERFACE_ATTRIBUTE
543void *operator new(__sanitizer::uptr size, std::nothrow_t const&);
544void *operator new(__sanitizer::uptr size, std::nothrow_t const&) {
545  OPERATOR_NEW_BODY(_ZnwmRKSt9nothrow_t);
546}
547
548SANITIZER_INTERFACE_ATTRIBUTE
549void *operator new[](__sanitizer::uptr size, std::nothrow_t const&);
550void *operator new[](__sanitizer::uptr size, std::nothrow_t const&) {
551  OPERATOR_NEW_BODY(_ZnamRKSt9nothrow_t);
552}
553
554#define OPERATOR_DELETE_BODY(mangled_name) \
555  if (ptr == 0) return;  \
556  if (cur_thread()->in_symbolizer || libjvm_check(GET_CALLER_PC())) \
557    return __libc_free(ptr); \
558  invoke_free_hook(ptr);  \
559  SCOPED_INTERCEPTOR_RAW(mangled_name, ptr);  \
560  user_free(thr, pc, ptr);
561
562SANITIZER_INTERFACE_ATTRIBUTE
563void operator delete(void *ptr);
564void operator delete(void *ptr) {
565  OPERATOR_DELETE_BODY(_ZdlPv);
566}
567
568SANITIZER_INTERFACE_ATTRIBUTE
569void operator delete[](void *ptr);
570void operator delete[](void *ptr) {
571  OPERATOR_DELETE_BODY(_ZdlPvRKSt9nothrow_t);
572}
573
574SANITIZER_INTERFACE_ATTRIBUTE
575void operator delete(void *ptr, std::nothrow_t const&);
576void operator delete(void *ptr, std::nothrow_t const&) {
577  OPERATOR_DELETE_BODY(_ZdaPv);
578}
579
580SANITIZER_INTERFACE_ATTRIBUTE
581void operator delete[](void *ptr, std::nothrow_t const&);
582void operator delete[](void *ptr, std::nothrow_t const&) {
583  OPERATOR_DELETE_BODY(_ZdaPvRKSt9nothrow_t);
584}
585
586TSAN_INTERCEPTOR(uptr, strlen, const char *s) {
587  SCOPED_TSAN_INTERCEPTOR(strlen, s);
588  uptr len = internal_strlen(s);
589  MemoryAccessRange(thr, pc, (uptr)s, len + 1, false);
590  return len;
591}
592
593TSAN_INTERCEPTOR(void*, memset, void *dst, int v, uptr size) {
594  SCOPED_TSAN_INTERCEPTOR(memset, dst, v, size);
595  MemoryAccessRange(thr, pc, (uptr)dst, size, true);
596  return internal_memset(dst, v, size);
597}
598
599TSAN_INTERCEPTOR(void*, memcpy, void *dst, const void *src, uptr size) {
600  SCOPED_TSAN_INTERCEPTOR(memcpy, dst, src, size);
601  MemoryAccessRange(thr, pc, (uptr)dst, size, true);
602  MemoryAccessRange(thr, pc, (uptr)src, size, false);
603  return internal_memcpy(dst, src, size);
604}
605
606TSAN_INTERCEPTOR(int, memcmp, const void *s1, const void *s2, uptr n) {
607  SCOPED_TSAN_INTERCEPTOR(memcmp, s1, s2, n);
608  int res = 0;
609  uptr len = 0;
610  for (; len < n; len++) {
611    if ((res = ((unsigned char*)s1)[len] - ((unsigned char*)s2)[len]))
612      break;
613  }
614  MemoryAccessRange(thr, pc, (uptr)s1, len < n ? len + 1 : n, false);
615  MemoryAccessRange(thr, pc, (uptr)s2, len < n ? len + 1 : n, false);
616  return res;
617}
618
619TSAN_INTERCEPTOR(void*, memchr, void *s, int c, uptr n) {
620  SCOPED_TSAN_INTERCEPTOR(memchr, s, c, n);
621  void *res = REAL(memchr)(s, c, n);
622  uptr len = res ? (char*)res - (char*)s + 1 : n;
623  MemoryAccessRange(thr, pc, (uptr)s, len, false);
624  return res;
625}
626
627TSAN_INTERCEPTOR(void*, memrchr, char *s, int c, uptr n) {
628  SCOPED_TSAN_INTERCEPTOR(memrchr, s, c, n);
629  MemoryAccessRange(thr, pc, (uptr)s, n, false);
630  return REAL(memrchr)(s, c, n);
631}
632
633TSAN_INTERCEPTOR(void*, memmove, void *dst, void *src, uptr n) {
634  SCOPED_TSAN_INTERCEPTOR(memmove, dst, src, n);
635  MemoryAccessRange(thr, pc, (uptr)dst, n, true);
636  MemoryAccessRange(thr, pc, (uptr)src, n, false);
637  return REAL(memmove)(dst, src, n);
638}
639
640TSAN_INTERCEPTOR(char*, strchr, char *s, int c) {
641  SCOPED_TSAN_INTERCEPTOR(strchr, s, c);
642  char *res = REAL(strchr)(s, c);
643  uptr len = res ? (char*)res - (char*)s + 1 : internal_strlen(s) + 1;
644  MemoryAccessRange(thr, pc, (uptr)s, len, false);
645  return res;
646}
647
648TSAN_INTERCEPTOR(char*, strchrnul, char *s, int c) {
649  SCOPED_TSAN_INTERCEPTOR(strchrnul, s, c);
650  char *res = REAL(strchrnul)(s, c);
651  uptr len = (char*)res - (char*)s + 1;
652  MemoryAccessRange(thr, pc, (uptr)s, len, false);
653  return res;
654}
655
656TSAN_INTERCEPTOR(char*, strrchr, char *s, int c) {
657  SCOPED_TSAN_INTERCEPTOR(strrchr, s, c);
658  MemoryAccessRange(thr, pc, (uptr)s, internal_strlen(s) + 1, false);
659  return REAL(strrchr)(s, c);
660}
661
662TSAN_INTERCEPTOR(char*, strcpy, char *dst, const char *src) {  // NOLINT
663  SCOPED_TSAN_INTERCEPTOR(strcpy, dst, src);  // NOLINT
664  uptr srclen = internal_strlen(src);
665  MemoryAccessRange(thr, pc, (uptr)dst, srclen + 1, true);
666  MemoryAccessRange(thr, pc, (uptr)src, srclen + 1, false);
667  return REAL(strcpy)(dst, src);  // NOLINT
668}
669
670TSAN_INTERCEPTOR(char*, strncpy, char *dst, char *src, uptr n) {
671  SCOPED_TSAN_INTERCEPTOR(strncpy, dst, src, n);
672  uptr srclen = internal_strnlen(src, n);
673  MemoryAccessRange(thr, pc, (uptr)dst, n, true);
674  MemoryAccessRange(thr, pc, (uptr)src, min(srclen + 1, n), false);
675  return REAL(strncpy)(dst, src, n);
676}
677
678TSAN_INTERCEPTOR(const char*, strstr, const char *s1, const char *s2) {
679  SCOPED_TSAN_INTERCEPTOR(strstr, s1, s2);
680  const char *res = REAL(strstr)(s1, s2);
681  uptr len1 = internal_strlen(s1);
682  uptr len2 = internal_strlen(s2);
683  MemoryAccessRange(thr, pc, (uptr)s1, len1 + 1, false);
684  MemoryAccessRange(thr, pc, (uptr)s2, len2 + 1, false);
685  return res;
686}
687
688TSAN_INTERCEPTOR(char*, strdup, const char *str) {
689  SCOPED_TSAN_INTERCEPTOR(strdup, str);
690  if (libjvm_check(pc)) {
691    // The memory must come from libc malloc,
692    // and we must not instrument accesses in this case.
693    uptr n = internal_strlen(str) + 1;
694    void *p = __libc_malloc(n);
695    if (p == 0)
696      return 0;
697    return (char*)internal_memcpy(p, str, n);
698  }
699  // strdup will call malloc, so no instrumentation is required here.
700  return REAL(strdup)(str);
701}
702
703static bool fix_mmap_addr(void **addr, long_t sz, int flags) {
704  if (*addr) {
705    if (!IsAppMem((uptr)*addr) || !IsAppMem((uptr)*addr + sz - 1)) {
706      if (flags & MAP_FIXED) {
707        errno = EINVAL;
708        return false;
709      } else {
710        *addr = 0;
711      }
712    }
713  }
714  return true;
715}
716
717TSAN_INTERCEPTOR(void*, mmap, void *addr, long_t sz, int prot,
718                         int flags, int fd, unsigned off) {
719  SCOPED_TSAN_INTERCEPTOR(mmap, addr, sz, prot, flags, fd, off);
720  if (!fix_mmap_addr(&addr, sz, flags))
721    return MAP_FAILED;
722  void *res = REAL(mmap)(addr, sz, prot, flags, fd, off);
723  if (res != MAP_FAILED) {
724    if (fd > 0)
725      FdAccess(thr, pc, fd);
726    MemoryRangeImitateWrite(thr, pc, (uptr)res, sz);
727  }
728  return res;
729}
730
731TSAN_INTERCEPTOR(void*, mmap64, void *addr, long_t sz, int prot,
732                           int flags, int fd, u64 off) {
733  SCOPED_TSAN_INTERCEPTOR(mmap64, addr, sz, prot, flags, fd, off);
734  if (!fix_mmap_addr(&addr, sz, flags))
735    return MAP_FAILED;
736  void *res = REAL(mmap64)(addr, sz, prot, flags, fd, off);
737  if (res != MAP_FAILED) {
738    if (fd > 0)
739      FdAccess(thr, pc, fd);
740    MemoryRangeImitateWrite(thr, pc, (uptr)res, sz);
741  }
742  return res;
743}
744
745TSAN_INTERCEPTOR(int, munmap, void *addr, long_t sz) {
746  SCOPED_TSAN_INTERCEPTOR(munmap, addr, sz);
747  DontNeedShadowFor((uptr)addr, sz);
748  int res = REAL(munmap)(addr, sz);
749  return res;
750}
751
752TSAN_INTERCEPTOR(void*, memalign, uptr align, uptr sz) {
753  SCOPED_TSAN_INTERCEPTOR(memalign, align, sz);
754  return user_alloc(thr, pc, sz, align);
755}
756
757TSAN_INTERCEPTOR(void*, valloc, uptr sz) {
758  SCOPED_TSAN_INTERCEPTOR(valloc, sz);
759  return user_alloc(thr, pc, sz, GetPageSizeCached());
760}
761
762TSAN_INTERCEPTOR(void*, pvalloc, uptr sz) {
763  SCOPED_TSAN_INTERCEPTOR(pvalloc, sz);
764  sz = RoundUp(sz, GetPageSizeCached());
765  return user_alloc(thr, pc, sz, GetPageSizeCached());
766}
767
768TSAN_INTERCEPTOR(int, posix_memalign, void **memptr, uptr align, uptr sz) {
769  SCOPED_TSAN_INTERCEPTOR(posix_memalign, memptr, align, sz);
770  *memptr = user_alloc(thr, pc, sz, align);
771  return 0;
772}
773
774// Used in thread-safe function static initialization.
775extern "C" int INTERFACE_ATTRIBUTE __cxa_guard_acquire(atomic_uint32_t *g) {
776  SCOPED_INTERCEPTOR_RAW(__cxa_guard_acquire, g);
777  for (;;) {
778    u32 cmp = atomic_load(g, memory_order_acquire);
779    if (cmp == 0) {
780      if (atomic_compare_exchange_strong(g, &cmp, 1<<16, memory_order_relaxed))
781        return 1;
782    } else if (cmp == 1) {
783      Acquire(thr, pc, (uptr)g);
784      return 0;
785    } else {
786      internal_sched_yield();
787    }
788  }
789}
790
791extern "C" void INTERFACE_ATTRIBUTE __cxa_guard_release(atomic_uint32_t *g) {
792  SCOPED_INTERCEPTOR_RAW(__cxa_guard_release, g);
793  Release(thr, pc, (uptr)g);
794  atomic_store(g, 1, memory_order_release);
795}
796
797extern "C" void INTERFACE_ATTRIBUTE __cxa_guard_abort(atomic_uint32_t *g) {
798  SCOPED_INTERCEPTOR_RAW(__cxa_guard_abort, g);
799  atomic_store(g, 0, memory_order_relaxed);
800}
801
802static void thread_finalize(void *v) {
803  uptr iter = (uptr)v;
804  if (iter > 1) {
805    if (pthread_setspecific(g_thread_finalize_key, (void*)(iter - 1))) {
806      Printf("ThreadSanitizer: failed to set thread key\n");
807      Die();
808    }
809    return;
810  }
811  {
812    ScopedInRtl in_rtl;
813    ThreadState *thr = cur_thread();
814    ThreadFinish(thr);
815    SignalContext *sctx = thr->signal_ctx;
816    if (sctx) {
817      thr->signal_ctx = 0;
818      UnmapOrDie(sctx, sizeof(*sctx));
819    }
820  }
821}
822
823
824struct ThreadParam {
825  void* (*callback)(void *arg);
826  void *param;
827  atomic_uintptr_t tid;
828};
829
830extern "C" void *__tsan_thread_start_func(void *arg) {
831  ThreadParam *p = (ThreadParam*)arg;
832  void* (*callback)(void *arg) = p->callback;
833  void *param = p->param;
834  int tid = 0;
835  {
836    ThreadState *thr = cur_thread();
837    ScopedInRtl in_rtl;
838    if (pthread_setspecific(g_thread_finalize_key, (void*)4)) {
839      Printf("ThreadSanitizer: failed to set thread key\n");
840      Die();
841    }
842    while ((tid = atomic_load(&p->tid, memory_order_acquire)) == 0)
843      pthread_yield();
844    atomic_store(&p->tid, 0, memory_order_release);
845    ThreadStart(thr, tid, GetTid());
846    CHECK_EQ(thr->in_rtl, 1);
847  }
848  void *res = callback(param);
849  // Prevent the callback from being tail called,
850  // it mixes up stack traces.
851  volatile int foo = 42;
852  foo++;
853  return res;
854}
855
856TSAN_INTERCEPTOR(int, pthread_create,
857    void *th, void *attr, void *(*callback)(void*), void * param) {
858  SCOPED_TSAN_INTERCEPTOR(pthread_create, th, attr, callback, param);
859  __sanitizer_pthread_attr_t myattr;
860  if (attr == 0) {
861    pthread_attr_init(&myattr);
862    attr = &myattr;
863  }
864  int detached = 0;
865  pthread_attr_getdetachstate(attr, &detached);
866
867#if defined(TSAN_DEBUG_OUTPUT)
868  int verbosity = (TSAN_DEBUG_OUTPUT);
869#else
870  int verbosity = 0;
871#endif
872  AdjustStackSizeLinux(attr, verbosity);
873
874  ThreadParam p;
875  p.callback = callback;
876  p.param = param;
877  atomic_store(&p.tid, 0, memory_order_relaxed);
878  int res = REAL(pthread_create)(th, attr, __tsan_thread_start_func, &p);
879  if (res == 0) {
880    int tid = ThreadCreate(thr, pc, *(uptr*)th, detached);
881    CHECK_NE(tid, 0);
882    atomic_store(&p.tid, tid, memory_order_release);
883    while (atomic_load(&p.tid, memory_order_acquire) != 0)
884      pthread_yield();
885  }
886  if (attr == &myattr)
887    pthread_attr_destroy(&myattr);
888  return res;
889}
890
891TSAN_INTERCEPTOR(int, pthread_join, void *th, void **ret) {
892  SCOPED_TSAN_INTERCEPTOR(pthread_join, th, ret);
893  int tid = ThreadTid(thr, pc, (uptr)th);
894  int res = BLOCK_REAL(pthread_join)(th, ret);
895  if (res == 0) {
896    ThreadJoin(thr, pc, tid);
897  }
898  return res;
899}
900
901TSAN_INTERCEPTOR(int, pthread_detach, void *th) {
902  SCOPED_TSAN_INTERCEPTOR(pthread_detach, th);
903  int tid = ThreadTid(thr, pc, (uptr)th);
904  int res = REAL(pthread_detach)(th);
905  if (res == 0) {
906    ThreadDetach(thr, pc, tid);
907  }
908  return res;
909}
910
911TSAN_INTERCEPTOR(int, pthread_mutex_init, void *m, void *a) {
912  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_init, m, a);
913  int res = REAL(pthread_mutex_init)(m, a);
914  if (res == 0) {
915    bool recursive = false;
916    if (a) {
917      int type = 0;
918      if (pthread_mutexattr_gettype(a, &type) == 0)
919        recursive = (type == PTHREAD_MUTEX_RECURSIVE
920            || type == PTHREAD_MUTEX_RECURSIVE_NP);
921    }
922    MutexCreate(thr, pc, (uptr)m, false, recursive, false);
923  }
924  return res;
925}
926
927TSAN_INTERCEPTOR(int, pthread_mutex_destroy, void *m) {
928  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_destroy, m);
929  int res = REAL(pthread_mutex_destroy)(m);
930  if (res == 0 || res == EBUSY) {
931    MutexDestroy(thr, pc, (uptr)m);
932  }
933  return res;
934}
935
936TSAN_INTERCEPTOR(int, pthread_mutex_lock, void *m) {
937  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_lock, m);
938  int res = REAL(pthread_mutex_lock)(m);
939  if (res == 0) {
940    MutexLock(thr, pc, (uptr)m);
941  }
942  return res;
943}
944
945TSAN_INTERCEPTOR(int, pthread_mutex_trylock, void *m) {
946  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_trylock, m);
947  int res = REAL(pthread_mutex_trylock)(m);
948  if (res == 0) {
949    MutexLock(thr, pc, (uptr)m);
950  }
951  return res;
952}
953
954TSAN_INTERCEPTOR(int, pthread_mutex_timedlock, void *m, void *abstime) {
955  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_timedlock, m, abstime);
956  int res = REAL(pthread_mutex_timedlock)(m, abstime);
957  if (res == 0) {
958    MutexLock(thr, pc, (uptr)m);
959  }
960  return res;
961}
962
963TSAN_INTERCEPTOR(int, pthread_mutex_unlock, void *m) {
964  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_unlock, m);
965  MutexUnlock(thr, pc, (uptr)m);
966  int res = REAL(pthread_mutex_unlock)(m);
967  return res;
968}
969
970TSAN_INTERCEPTOR(int, pthread_spin_init, void *m, int pshared) {
971  SCOPED_TSAN_INTERCEPTOR(pthread_spin_init, m, pshared);
972  int res = REAL(pthread_spin_init)(m, pshared);
973  if (res == 0) {
974    MutexCreate(thr, pc, (uptr)m, false, false, false);
975  }
976  return res;
977}
978
979TSAN_INTERCEPTOR(int, pthread_spin_destroy, void *m) {
980  SCOPED_TSAN_INTERCEPTOR(pthread_spin_destroy, m);
981  int res = REAL(pthread_spin_destroy)(m);
982  if (res == 0) {
983    MutexDestroy(thr, pc, (uptr)m);
984  }
985  return res;
986}
987
988TSAN_INTERCEPTOR(int, pthread_spin_lock, void *m) {
989  SCOPED_TSAN_INTERCEPTOR(pthread_spin_lock, m);
990  int res = REAL(pthread_spin_lock)(m);
991  if (res == 0) {
992    MutexLock(thr, pc, (uptr)m);
993  }
994  return res;
995}
996
997TSAN_INTERCEPTOR(int, pthread_spin_trylock, void *m) {
998  SCOPED_TSAN_INTERCEPTOR(pthread_spin_trylock, m);
999  int res = REAL(pthread_spin_trylock)(m);
1000  if (res == 0) {
1001    MutexLock(thr, pc, (uptr)m);
1002  }
1003  return res;
1004}
1005
1006TSAN_INTERCEPTOR(int, pthread_spin_unlock, void *m) {
1007  SCOPED_TSAN_INTERCEPTOR(pthread_spin_unlock, m);
1008  MutexUnlock(thr, pc, (uptr)m);
1009  int res = REAL(pthread_spin_unlock)(m);
1010  return res;
1011}
1012
1013TSAN_INTERCEPTOR(int, pthread_rwlock_init, void *m, void *a) {
1014  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_init, m, a);
1015  int res = REAL(pthread_rwlock_init)(m, a);
1016  if (res == 0) {
1017    MutexCreate(thr, pc, (uptr)m, true, false, false);
1018  }
1019  return res;
1020}
1021
1022TSAN_INTERCEPTOR(int, pthread_rwlock_destroy, void *m) {
1023  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_destroy, m);
1024  int res = REAL(pthread_rwlock_destroy)(m);
1025  if (res == 0) {
1026    MutexDestroy(thr, pc, (uptr)m);
1027  }
1028  return res;
1029}
1030
1031TSAN_INTERCEPTOR(int, pthread_rwlock_rdlock, void *m) {
1032  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_rdlock, m);
1033  int res = REAL(pthread_rwlock_rdlock)(m);
1034  if (res == 0) {
1035    MutexReadLock(thr, pc, (uptr)m);
1036  }
1037  return res;
1038}
1039
1040TSAN_INTERCEPTOR(int, pthread_rwlock_tryrdlock, void *m) {
1041  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_tryrdlock, m);
1042  int res = REAL(pthread_rwlock_tryrdlock)(m);
1043  if (res == 0) {
1044    MutexReadLock(thr, pc, (uptr)m);
1045  }
1046  return res;
1047}
1048
1049TSAN_INTERCEPTOR(int, pthread_rwlock_timedrdlock, void *m, void *abstime) {
1050  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedrdlock, m, abstime);
1051  int res = REAL(pthread_rwlock_timedrdlock)(m, abstime);
1052  if (res == 0) {
1053    MutexReadLock(thr, pc, (uptr)m);
1054  }
1055  return res;
1056}
1057
1058TSAN_INTERCEPTOR(int, pthread_rwlock_wrlock, void *m) {
1059  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_wrlock, m);
1060  int res = REAL(pthread_rwlock_wrlock)(m);
1061  if (res == 0) {
1062    MutexLock(thr, pc, (uptr)m);
1063  }
1064  return res;
1065}
1066
1067TSAN_INTERCEPTOR(int, pthread_rwlock_trywrlock, void *m) {
1068  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_trywrlock, m);
1069  int res = REAL(pthread_rwlock_trywrlock)(m);
1070  if (res == 0) {
1071    MutexLock(thr, pc, (uptr)m);
1072  }
1073  return res;
1074}
1075
1076TSAN_INTERCEPTOR(int, pthread_rwlock_timedwrlock, void *m, void *abstime) {
1077  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedwrlock, m, abstime);
1078  int res = REAL(pthread_rwlock_timedwrlock)(m, abstime);
1079  if (res == 0) {
1080    MutexLock(thr, pc, (uptr)m);
1081  }
1082  return res;
1083}
1084
1085TSAN_INTERCEPTOR(int, pthread_rwlock_unlock, void *m) {
1086  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_unlock, m);
1087  MutexReadOrWriteUnlock(thr, pc, (uptr)m);
1088  int res = REAL(pthread_rwlock_unlock)(m);
1089  return res;
1090}
1091
1092TSAN_INTERCEPTOR(int, pthread_cond_init, void *c, void *a) {
1093  SCOPED_TSAN_INTERCEPTOR(pthread_cond_init, c, a);
1094  MemoryWrite(thr, pc, (uptr)c, kSizeLog1);
1095  int res = REAL(pthread_cond_init)(c, a);
1096  return res;
1097}
1098
1099TSAN_INTERCEPTOR(int, pthread_cond_destroy, void *c) {
1100  SCOPED_TSAN_INTERCEPTOR(pthread_cond_destroy, c);
1101  MemoryWrite(thr, pc, (uptr)c, kSizeLog1);
1102  int res = REAL(pthread_cond_destroy)(c);
1103  return res;
1104}
1105
1106TSAN_INTERCEPTOR(int, pthread_cond_signal, void *c) {
1107  SCOPED_TSAN_INTERCEPTOR(pthread_cond_signal, c);
1108  MemoryRead(thr, pc, (uptr)c, kSizeLog1);
1109  int res = REAL(pthread_cond_signal)(c);
1110  return res;
1111}
1112
1113TSAN_INTERCEPTOR(int, pthread_cond_broadcast, void *c) {
1114  SCOPED_TSAN_INTERCEPTOR(pthread_cond_broadcast, c);
1115  MemoryRead(thr, pc, (uptr)c, kSizeLog1);
1116  int res = REAL(pthread_cond_broadcast)(c);
1117  return res;
1118}
1119
1120TSAN_INTERCEPTOR(int, pthread_cond_wait, void *c, void *m) {
1121  SCOPED_TSAN_INTERCEPTOR(pthread_cond_wait, c, m);
1122  MutexUnlock(thr, pc, (uptr)m);
1123  MemoryRead(thr, pc, (uptr)c, kSizeLog1);
1124  int res = REAL(pthread_cond_wait)(c, m);
1125  MutexLock(thr, pc, (uptr)m);
1126  return res;
1127}
1128
1129TSAN_INTERCEPTOR(int, pthread_cond_timedwait, void *c, void *m,
1130    void *abstime) {
1131  SCOPED_TSAN_INTERCEPTOR(pthread_cond_timedwait, c, m, abstime);
1132  MutexUnlock(thr, pc, (uptr)m);
1133  MemoryRead(thr, pc, (uptr)c, kSizeLog1);
1134  int res = REAL(pthread_cond_timedwait)(c, m, abstime);
1135  MutexLock(thr, pc, (uptr)m);
1136  return res;
1137}
1138
1139TSAN_INTERCEPTOR(int, pthread_barrier_init, void *b, void *a, unsigned count) {
1140  SCOPED_TSAN_INTERCEPTOR(pthread_barrier_init, b, a, count);
1141  MemoryWrite(thr, pc, (uptr)b, kSizeLog1);
1142  int res = REAL(pthread_barrier_init)(b, a, count);
1143  return res;
1144}
1145
1146TSAN_INTERCEPTOR(int, pthread_barrier_destroy, void *b) {
1147  SCOPED_TSAN_INTERCEPTOR(pthread_barrier_destroy, b);
1148  MemoryWrite(thr, pc, (uptr)b, kSizeLog1);
1149  int res = REAL(pthread_barrier_destroy)(b);
1150  return res;
1151}
1152
1153TSAN_INTERCEPTOR(int, pthread_barrier_wait, void *b) {
1154  SCOPED_TSAN_INTERCEPTOR(pthread_barrier_wait, b);
1155  Release(thr, pc, (uptr)b);
1156  MemoryRead(thr, pc, (uptr)b, kSizeLog1);
1157  int res = REAL(pthread_barrier_wait)(b);
1158  MemoryRead(thr, pc, (uptr)b, kSizeLog1);
1159  if (res == 0 || res == PTHREAD_BARRIER_SERIAL_THREAD) {
1160    Acquire(thr, pc, (uptr)b);
1161  }
1162  return res;
1163}
1164
1165TSAN_INTERCEPTOR(int, pthread_once, void *o, void (*f)()) {
1166  SCOPED_TSAN_INTERCEPTOR(pthread_once, o, f);
1167  if (o == 0 || f == 0)
1168    return EINVAL;
1169  atomic_uint32_t *a = static_cast<atomic_uint32_t*>(o);
1170  u32 v = atomic_load(a, memory_order_acquire);
1171  if (v == 0 && atomic_compare_exchange_strong(a, &v, 1,
1172                                               memory_order_relaxed)) {
1173    const int old_in_rtl = thr->in_rtl;
1174    thr->in_rtl = 0;
1175    (*f)();
1176    CHECK_EQ(thr->in_rtl, 0);
1177    thr->in_rtl = old_in_rtl;
1178    Release(thr, pc, (uptr)o);
1179    atomic_store(a, 2, memory_order_release);
1180  } else {
1181    while (v != 2) {
1182      pthread_yield();
1183      v = atomic_load(a, memory_order_acquire);
1184    }
1185    Acquire(thr, pc, (uptr)o);
1186  }
1187  return 0;
1188}
1189
1190TSAN_INTERCEPTOR(int, sem_init, void *s, int pshared, unsigned value) {
1191  SCOPED_TSAN_INTERCEPTOR(sem_init, s, pshared, value);
1192  int res = REAL(sem_init)(s, pshared, value);
1193  return res;
1194}
1195
1196TSAN_INTERCEPTOR(int, sem_destroy, void *s) {
1197  SCOPED_TSAN_INTERCEPTOR(sem_destroy, s);
1198  int res = REAL(sem_destroy)(s);
1199  return res;
1200}
1201
1202TSAN_INTERCEPTOR(int, sem_wait, void *s) {
1203  SCOPED_TSAN_INTERCEPTOR(sem_wait, s);
1204  int res = BLOCK_REAL(sem_wait)(s);
1205  if (res == 0) {
1206    Acquire(thr, pc, (uptr)s);
1207  }
1208  return res;
1209}
1210
1211TSAN_INTERCEPTOR(int, sem_trywait, void *s) {
1212  SCOPED_TSAN_INTERCEPTOR(sem_trywait, s);
1213  int res = BLOCK_REAL(sem_trywait)(s);
1214  if (res == 0) {
1215    Acquire(thr, pc, (uptr)s);
1216  }
1217  return res;
1218}
1219
1220TSAN_INTERCEPTOR(int, sem_timedwait, void *s, void *abstime) {
1221  SCOPED_TSAN_INTERCEPTOR(sem_timedwait, s, abstime);
1222  int res = BLOCK_REAL(sem_timedwait)(s, abstime);
1223  if (res == 0) {
1224    Acquire(thr, pc, (uptr)s);
1225  }
1226  return res;
1227}
1228
1229TSAN_INTERCEPTOR(int, sem_post, void *s) {
1230  SCOPED_TSAN_INTERCEPTOR(sem_post, s);
1231  Release(thr, pc, (uptr)s);
1232  int res = REAL(sem_post)(s);
1233  return res;
1234}
1235
1236TSAN_INTERCEPTOR(int, sem_getvalue, void *s, int *sval) {
1237  SCOPED_TSAN_INTERCEPTOR(sem_getvalue, s, sval);
1238  int res = REAL(sem_getvalue)(s, sval);
1239  if (res == 0) {
1240    Acquire(thr, pc, (uptr)s);
1241  }
1242  return res;
1243}
1244
1245TSAN_INTERCEPTOR(int, __xstat, int version, const char *path, void *buf) {
1246  SCOPED_TSAN_INTERCEPTOR(__xstat, version, path, buf);
1247  return REAL(__xstat)(version, path, buf);
1248}
1249
1250TSAN_INTERCEPTOR(int, stat, const char *path, void *buf) {
1251  SCOPED_TSAN_INTERCEPTOR(__xstat, 0, path, buf);
1252  return REAL(__xstat)(0, path, buf);
1253}
1254
1255TSAN_INTERCEPTOR(int, __xstat64, int version, const char *path, void *buf) {
1256  SCOPED_TSAN_INTERCEPTOR(__xstat64, version, path, buf);
1257  return REAL(__xstat64)(version, path, buf);
1258}
1259
1260TSAN_INTERCEPTOR(int, stat64, const char *path, void *buf) {
1261  SCOPED_TSAN_INTERCEPTOR(__xstat64, 0, path, buf);
1262  return REAL(__xstat64)(0, path, buf);
1263}
1264
1265TSAN_INTERCEPTOR(int, __lxstat, int version, const char *path, void *buf) {
1266  SCOPED_TSAN_INTERCEPTOR(__lxstat, version, path, buf);
1267  return REAL(__lxstat)(version, path, buf);
1268}
1269
1270TSAN_INTERCEPTOR(int, lstat, const char *path, void *buf) {
1271  SCOPED_TSAN_INTERCEPTOR(__lxstat, 0, path, buf);
1272  return REAL(__lxstat)(0, path, buf);
1273}
1274
1275TSAN_INTERCEPTOR(int, __lxstat64, int version, const char *path, void *buf) {
1276  SCOPED_TSAN_INTERCEPTOR(__lxstat64, version, path, buf);
1277  return REAL(__lxstat64)(version, path, buf);
1278}
1279
1280TSAN_INTERCEPTOR(int, lstat64, const char *path, void *buf) {
1281  SCOPED_TSAN_INTERCEPTOR(__lxstat64, 0, path, buf);
1282  return REAL(__lxstat64)(0, path, buf);
1283}
1284
1285TSAN_INTERCEPTOR(int, __fxstat, int version, int fd, void *buf) {
1286  SCOPED_TSAN_INTERCEPTOR(__fxstat, version, fd, buf);
1287  if (fd > 0)
1288    FdAccess(thr, pc, fd);
1289  return REAL(__fxstat)(version, fd, buf);
1290}
1291
1292TSAN_INTERCEPTOR(int, fstat, int fd, void *buf) {
1293  SCOPED_TSAN_INTERCEPTOR(__fxstat, 0, fd, buf);
1294  if (fd > 0)
1295    FdAccess(thr, pc, fd);
1296  return REAL(__fxstat)(0, fd, buf);
1297}
1298
1299TSAN_INTERCEPTOR(int, __fxstat64, int version, int fd, void *buf) {
1300  SCOPED_TSAN_INTERCEPTOR(__fxstat64, version, fd, buf);
1301  if (fd > 0)
1302    FdAccess(thr, pc, fd);
1303  return REAL(__fxstat64)(version, fd, buf);
1304}
1305
1306TSAN_INTERCEPTOR(int, fstat64, int fd, void *buf) {
1307  SCOPED_TSAN_INTERCEPTOR(__fxstat64, 0, fd, buf);
1308  if (fd > 0)
1309    FdAccess(thr, pc, fd);
1310  return REAL(__fxstat64)(0, fd, buf);
1311}
1312
1313TSAN_INTERCEPTOR(int, open, const char *name, int flags, int mode) {
1314  SCOPED_TSAN_INTERCEPTOR(open, name, flags, mode);
1315  int fd = REAL(open)(name, flags, mode);
1316  if (fd >= 0)
1317    FdFileCreate(thr, pc, fd);
1318  return fd;
1319}
1320
1321TSAN_INTERCEPTOR(int, open64, const char *name, int flags, int mode) {
1322  SCOPED_TSAN_INTERCEPTOR(open64, name, flags, mode);
1323  int fd = REAL(open64)(name, flags, mode);
1324  if (fd >= 0)
1325    FdFileCreate(thr, pc, fd);
1326  return fd;
1327}
1328
1329TSAN_INTERCEPTOR(int, creat, const char *name, int mode) {
1330  SCOPED_TSAN_INTERCEPTOR(creat, name, mode);
1331  int fd = REAL(creat)(name, mode);
1332  if (fd >= 0)
1333    FdFileCreate(thr, pc, fd);
1334  return fd;
1335}
1336
1337TSAN_INTERCEPTOR(int, creat64, const char *name, int mode) {
1338  SCOPED_TSAN_INTERCEPTOR(creat64, name, mode);
1339  int fd = REAL(creat64)(name, mode);
1340  if (fd >= 0)
1341    FdFileCreate(thr, pc, fd);
1342  return fd;
1343}
1344
1345TSAN_INTERCEPTOR(int, dup, int oldfd) {
1346  SCOPED_TSAN_INTERCEPTOR(dup, oldfd);
1347  int newfd = REAL(dup)(oldfd);
1348  if (oldfd >= 0 && newfd >= 0 && newfd != oldfd)
1349    FdDup(thr, pc, oldfd, newfd);
1350  return newfd;
1351}
1352
1353TSAN_INTERCEPTOR(int, dup2, int oldfd, int newfd) {
1354  SCOPED_TSAN_INTERCEPTOR(dup2, oldfd, newfd);
1355  int newfd2 = REAL(dup2)(oldfd, newfd);
1356  if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
1357    FdDup(thr, pc, oldfd, newfd2);
1358  return newfd2;
1359}
1360
1361TSAN_INTERCEPTOR(int, dup3, int oldfd, int newfd, int flags) {
1362  SCOPED_TSAN_INTERCEPTOR(dup3, oldfd, newfd, flags);
1363  int newfd2 = REAL(dup3)(oldfd, newfd, flags);
1364  if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
1365    FdDup(thr, pc, oldfd, newfd2);
1366  return newfd2;
1367}
1368
1369TSAN_INTERCEPTOR(int, eventfd, unsigned initval, int flags) {
1370  SCOPED_TSAN_INTERCEPTOR(eventfd, initval, flags);
1371  int fd = REAL(eventfd)(initval, flags);
1372  if (fd >= 0)
1373    FdEventCreate(thr, pc, fd);
1374  return fd;
1375}
1376
1377TSAN_INTERCEPTOR(int, signalfd, int fd, void *mask, int flags) {
1378  SCOPED_TSAN_INTERCEPTOR(signalfd, fd, mask, flags);
1379  if (fd >= 0)
1380    FdClose(thr, pc, fd);
1381  fd = REAL(signalfd)(fd, mask, flags);
1382  if (fd >= 0)
1383    FdSignalCreate(thr, pc, fd);
1384  return fd;
1385}
1386
1387TSAN_INTERCEPTOR(int, inotify_init, int fake) {
1388  SCOPED_TSAN_INTERCEPTOR(inotify_init, fake);
1389  int fd = REAL(inotify_init)(fake);
1390  if (fd >= 0)
1391    FdInotifyCreate(thr, pc, fd);
1392  return fd;
1393}
1394
1395TSAN_INTERCEPTOR(int, inotify_init1, int flags) {
1396  SCOPED_TSAN_INTERCEPTOR(inotify_init1, flags);
1397  int fd = REAL(inotify_init1)(flags);
1398  if (fd >= 0)
1399    FdInotifyCreate(thr, pc, fd);
1400  return fd;
1401}
1402
1403TSAN_INTERCEPTOR(int, socket, int domain, int type, int protocol) {
1404  SCOPED_TSAN_INTERCEPTOR(socket, domain, type, protocol);
1405  int fd = REAL(socket)(domain, type, protocol);
1406  if (fd >= 0)
1407    FdSocketCreate(thr, pc, fd);
1408  return fd;
1409}
1410
1411TSAN_INTERCEPTOR(int, socketpair, int domain, int type, int protocol, int *fd) {
1412  SCOPED_TSAN_INTERCEPTOR(socketpair, domain, type, protocol, fd);
1413  int res = REAL(socketpair)(domain, type, protocol, fd);
1414  if (res == 0 && fd[0] >= 0 && fd[1] >= 0)
1415    FdPipeCreate(thr, pc, fd[0], fd[1]);
1416  return res;
1417}
1418
1419TSAN_INTERCEPTOR(int, connect, int fd, void *addr, unsigned addrlen) {
1420  SCOPED_TSAN_INTERCEPTOR(connect, fd, addr, addrlen);
1421  FdSocketConnecting(thr, pc, fd);
1422  int res = REAL(connect)(fd, addr, addrlen);
1423  if (res == 0 && fd >= 0)
1424    FdSocketConnect(thr, pc, fd);
1425  return res;
1426}
1427
1428TSAN_INTERCEPTOR(int, bind, int fd, void *addr, unsigned addrlen) {
1429  SCOPED_TSAN_INTERCEPTOR(bind, fd, addr, addrlen);
1430  int res = REAL(bind)(fd, addr, addrlen);
1431  if (fd > 0 && res == 0)
1432    FdAccess(thr, pc, fd);
1433  return res;
1434}
1435
1436TSAN_INTERCEPTOR(int, listen, int fd, int backlog) {
1437  SCOPED_TSAN_INTERCEPTOR(listen, fd, backlog);
1438  int res = REAL(listen)(fd, backlog);
1439  if (fd > 0 && res == 0)
1440    FdAccess(thr, pc, fd);
1441  return res;
1442}
1443
1444TSAN_INTERCEPTOR(int, epoll_create, int size) {
1445  SCOPED_TSAN_INTERCEPTOR(epoll_create, size);
1446  int fd = REAL(epoll_create)(size);
1447  if (fd >= 0)
1448    FdPollCreate(thr, pc, fd);
1449  return fd;
1450}
1451
1452TSAN_INTERCEPTOR(int, epoll_create1, int flags) {
1453  SCOPED_TSAN_INTERCEPTOR(epoll_create1, flags);
1454  int fd = REAL(epoll_create1)(flags);
1455  if (fd >= 0)
1456    FdPollCreate(thr, pc, fd);
1457  return fd;
1458}
1459
1460TSAN_INTERCEPTOR(int, close, int fd) {
1461  SCOPED_TSAN_INTERCEPTOR(close, fd);
1462  if (fd >= 0)
1463    FdClose(thr, pc, fd);
1464  return REAL(close)(fd);
1465}
1466
1467TSAN_INTERCEPTOR(int, __close, int fd) {
1468  SCOPED_TSAN_INTERCEPTOR(__close, fd);
1469  if (fd >= 0)
1470    FdClose(thr, pc, fd);
1471  return REAL(__close)(fd);
1472}
1473
1474// glibc guts
1475TSAN_INTERCEPTOR(void, __res_iclose, void *state, bool free_addr) {
1476  SCOPED_TSAN_INTERCEPTOR(__res_iclose, state, free_addr);
1477  int fds[64];
1478  int cnt = ExtractResolvFDs(state, fds, ARRAY_SIZE(fds));
1479  for (int i = 0; i < cnt; i++) {
1480    if (fds[i] > 0)
1481      FdClose(thr, pc, fds[i]);
1482  }
1483  REAL(__res_iclose)(state, free_addr);
1484}
1485
1486TSAN_INTERCEPTOR(int, pipe, int *pipefd) {
1487  SCOPED_TSAN_INTERCEPTOR(pipe, pipefd);
1488  int res = REAL(pipe)(pipefd);
1489  if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
1490    FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
1491  return res;
1492}
1493
1494TSAN_INTERCEPTOR(int, pipe2, int *pipefd, int flags) {
1495  SCOPED_TSAN_INTERCEPTOR(pipe2, pipefd, flags);
1496  int res = REAL(pipe2)(pipefd, flags);
1497  if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
1498    FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
1499  return res;
1500}
1501
1502TSAN_INTERCEPTOR(long_t, send, int fd, void *buf, long_t len, int flags) {
1503  SCOPED_TSAN_INTERCEPTOR(send, fd, buf, len, flags);
1504  if (fd >= 0)
1505    FdRelease(thr, pc, fd);
1506  int res = REAL(send)(fd, buf, len, flags);
1507  return res;
1508}
1509
1510TSAN_INTERCEPTOR(long_t, sendmsg, int fd, void *msg, int flags) {
1511  SCOPED_TSAN_INTERCEPTOR(sendmsg, fd, msg, flags);
1512  if (fd >= 0)
1513    FdRelease(thr, pc, fd);
1514  int res = REAL(sendmsg)(fd, msg, flags);
1515  return res;
1516}
1517
1518TSAN_INTERCEPTOR(long_t, recv, int fd, void *buf, long_t len, int flags) {
1519  SCOPED_TSAN_INTERCEPTOR(recv, fd, buf, len, flags);
1520  int res = REAL(recv)(fd, buf, len, flags);
1521  if (res >= 0 && fd >= 0) {
1522    FdAcquire(thr, pc, fd);
1523  }
1524  return res;
1525}
1526
1527TSAN_INTERCEPTOR(int, unlink, char *path) {
1528  SCOPED_TSAN_INTERCEPTOR(unlink, path);
1529  Release(thr, pc, File2addr(path));
1530  int res = REAL(unlink)(path);
1531  return res;
1532}
1533
1534TSAN_INTERCEPTOR(void*, fopen, char *path, char *mode) {
1535  SCOPED_TSAN_INTERCEPTOR(fopen, path, mode);
1536  void *res = REAL(fopen)(path, mode);
1537  Acquire(thr, pc, File2addr(path));
1538  if (res) {
1539    int fd = fileno_unlocked(res);
1540    if (fd >= 0)
1541      FdFileCreate(thr, pc, fd);
1542  }
1543  return res;
1544}
1545
1546TSAN_INTERCEPTOR(void*, freopen, char *path, char *mode, void *stream) {
1547  SCOPED_TSAN_INTERCEPTOR(freopen, path, mode, stream);
1548  if (stream) {
1549    int fd = fileno_unlocked(stream);
1550    if (fd >= 0)
1551      FdClose(thr, pc, fd);
1552  }
1553  void *res = REAL(freopen)(path, mode, stream);
1554  Acquire(thr, pc, File2addr(path));
1555  if (res) {
1556    int fd = fileno_unlocked(res);
1557    if (fd >= 0)
1558      FdFileCreate(thr, pc, fd);
1559  }
1560  return res;
1561}
1562
1563TSAN_INTERCEPTOR(int, fclose, void *stream) {
1564  {
1565    SCOPED_TSAN_INTERCEPTOR(fclose, stream);
1566    if (stream) {
1567      int fd = fileno_unlocked(stream);
1568      if (fd >= 0)
1569        FdClose(thr, pc, fd);
1570    }
1571  }
1572  return REAL(fclose)(stream);
1573}
1574
1575TSAN_INTERCEPTOR(uptr, fread, void *ptr, uptr size, uptr nmemb, void *f) {
1576  {
1577    SCOPED_TSAN_INTERCEPTOR(fread, ptr, size, nmemb, f);
1578    MemoryAccessRange(thr, pc, (uptr)ptr, size * nmemb, true);
1579  }
1580  return REAL(fread)(ptr, size, nmemb, f);
1581}
1582
1583TSAN_INTERCEPTOR(uptr, fwrite, const void *p, uptr size, uptr nmemb, void *f) {
1584  {
1585    SCOPED_TSAN_INTERCEPTOR(fwrite, p, size, nmemb, f);
1586    MemoryAccessRange(thr, pc, (uptr)p, size * nmemb, false);
1587  }
1588  return REAL(fwrite)(p, size, nmemb, f);
1589}
1590
1591TSAN_INTERCEPTOR(int, fflush, void *stream) {
1592  SCOPED_TSAN_INTERCEPTOR(fflush, stream);
1593  return REAL(fflush)(stream);
1594}
1595
1596TSAN_INTERCEPTOR(void, abort, int fake) {
1597  SCOPED_TSAN_INTERCEPTOR(abort, fake);
1598  REAL(fflush)(0);
1599  REAL(abort)(fake);
1600}
1601
1602TSAN_INTERCEPTOR(int, puts, const char *s) {
1603  SCOPED_TSAN_INTERCEPTOR(puts, s);
1604  MemoryAccessRange(thr, pc, (uptr)s, internal_strlen(s), false);
1605  return REAL(puts)(s);
1606}
1607
1608TSAN_INTERCEPTOR(int, rmdir, char *path) {
1609  SCOPED_TSAN_INTERCEPTOR(rmdir, path);
1610  Release(thr, pc, Dir2addr(path));
1611  int res = REAL(rmdir)(path);
1612  return res;
1613}
1614
1615TSAN_INTERCEPTOR(void*, opendir, char *path) {
1616  SCOPED_TSAN_INTERCEPTOR(opendir, path);
1617  void *res = REAL(opendir)(path);
1618  if (res != 0)
1619    Acquire(thr, pc, Dir2addr(path));
1620  return res;
1621}
1622
1623TSAN_INTERCEPTOR(int, epoll_ctl, int epfd, int op, int fd, void *ev) {
1624  SCOPED_TSAN_INTERCEPTOR(epoll_ctl, epfd, op, fd, ev);
1625  if (op == EPOLL_CTL_ADD && epfd >= 0) {
1626    FdRelease(thr, pc, epfd);
1627  }
1628  int res = REAL(epoll_ctl)(epfd, op, fd, ev);
1629  if (fd >= 0)
1630    FdAccess(thr, pc, fd);
1631  return res;
1632}
1633
1634TSAN_INTERCEPTOR(int, epoll_wait, int epfd, void *ev, int cnt, int timeout) {
1635  SCOPED_TSAN_INTERCEPTOR(epoll_wait, epfd, ev, cnt, timeout);
1636  int res = BLOCK_REAL(epoll_wait)(epfd, ev, cnt, timeout);
1637  if (res > 0 && epfd >= 0) {
1638    FdAcquire(thr, pc, epfd);
1639  }
1640  return res;
1641}
1642
1643void ALWAYS_INLINE rtl_generic_sighandler(bool sigact, int sig,
1644    my_siginfo_t *info, void *ctx) {
1645  ThreadState *thr = cur_thread();
1646  SignalContext *sctx = SigCtx(thr);
1647  // Don't mess with synchronous signals.
1648  if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
1649      sig == SIGABRT || sig == SIGFPE || sig == SIGPIPE || sig == SIGSYS ||
1650      // If we are sending signal to ourselves, we must process it now.
1651      (sctx && sig == sctx->int_signal_send) ||
1652      // If we are in blocking function, we can safely process it now
1653      // (but check if we are in a recursive interceptor,
1654      // i.e. pthread_join()->munmap()).
1655      (sctx && sctx->in_blocking_func == 1 && thr->in_rtl == 1)) {
1656    int in_rtl = thr->in_rtl;
1657    thr->in_rtl = 0;
1658    CHECK_EQ(thr->in_signal_handler, false);
1659    thr->in_signal_handler = true;
1660    if (sigact)
1661      sigactions[sig].sa_sigaction(sig, info, ctx);
1662    else
1663      sigactions[sig].sa_handler(sig);
1664    CHECK_EQ(thr->in_signal_handler, true);
1665    thr->in_signal_handler = false;
1666    thr->in_rtl = in_rtl;
1667    return;
1668  }
1669
1670  if (sctx == 0)
1671    return;
1672  SignalDesc *signal = &sctx->pending_signals[sig];
1673  if (signal->armed == false) {
1674    signal->armed = true;
1675    signal->sigaction = sigact;
1676    if (info)
1677      internal_memcpy(&signal->siginfo, info, sizeof(*info));
1678    if (ctx)
1679      internal_memcpy(&signal->ctx, ctx, sizeof(signal->ctx));
1680    sctx->pending_signal_count++;
1681  }
1682}
1683
1684static void rtl_sighandler(int sig) {
1685  rtl_generic_sighandler(false, sig, 0, 0);
1686}
1687
1688static void rtl_sigaction(int sig, my_siginfo_t *info, void *ctx) {
1689  rtl_generic_sighandler(true, sig, info, ctx);
1690}
1691
1692TSAN_INTERCEPTOR(int, sigaction, int sig, sigaction_t *act, sigaction_t *old) {
1693  SCOPED_TSAN_INTERCEPTOR(sigaction, sig, act, old);
1694  if (old)
1695    internal_memcpy(old, &sigactions[sig], sizeof(*old));
1696  if (act == 0)
1697    return 0;
1698  internal_memcpy(&sigactions[sig], act, sizeof(*act));
1699  sigaction_t newact;
1700  internal_memcpy(&newact, act, sizeof(newact));
1701  sigfillset(&newact.sa_mask);
1702  if (act->sa_handler != SIG_IGN && act->sa_handler != SIG_DFL) {
1703    if (newact.sa_flags & SA_SIGINFO)
1704      newact.sa_sigaction = rtl_sigaction;
1705    else
1706      newact.sa_handler = rtl_sighandler;
1707  }
1708  int res = REAL(sigaction)(sig, &newact, 0);
1709  return res;
1710}
1711
1712TSAN_INTERCEPTOR(sighandler_t, signal, int sig, sighandler_t h) {
1713  sigaction_t act;
1714  act.sa_handler = h;
1715  REAL(memset)(&act.sa_mask, -1, sizeof(act.sa_mask));
1716  act.sa_flags = 0;
1717  sigaction_t old;
1718  int res = sigaction(sig, &act, &old);
1719  if (res)
1720    return SIG_ERR;
1721  return old.sa_handler;
1722}
1723
1724TSAN_INTERCEPTOR(int, sigsuspend, const sigset_t *mask) {
1725  SCOPED_TSAN_INTERCEPTOR(sigsuspend, mask);
1726  return REAL(sigsuspend)(mask);
1727}
1728
1729TSAN_INTERCEPTOR(int, raise, int sig) {
1730  SCOPED_TSAN_INTERCEPTOR(raise, sig);
1731  SignalContext *sctx = SigCtx(thr);
1732  CHECK_NE(sctx, 0);
1733  int prev = sctx->int_signal_send;
1734  sctx->int_signal_send = sig;
1735  int res = REAL(raise)(sig);
1736  CHECK_EQ(sctx->int_signal_send, sig);
1737  sctx->int_signal_send = prev;
1738  return res;
1739}
1740
1741TSAN_INTERCEPTOR(int, kill, int pid, int sig) {
1742  SCOPED_TSAN_INTERCEPTOR(kill, pid, sig);
1743  SignalContext *sctx = SigCtx(thr);
1744  CHECK_NE(sctx, 0);
1745  int prev = sctx->int_signal_send;
1746  if (pid == (int)internal_getpid()) {
1747    sctx->int_signal_send = sig;
1748  }
1749  int res = REAL(kill)(pid, sig);
1750  if (pid == (int)internal_getpid()) {
1751    CHECK_EQ(sctx->int_signal_send, sig);
1752    sctx->int_signal_send = prev;
1753  }
1754  return res;
1755}
1756
1757TSAN_INTERCEPTOR(int, pthread_kill, void *tid, int sig) {
1758  SCOPED_TSAN_INTERCEPTOR(pthread_kill, tid, sig);
1759  SignalContext *sctx = SigCtx(thr);
1760  CHECK_NE(sctx, 0);
1761  int prev = sctx->int_signal_send;
1762  if (tid == pthread_self()) {
1763    sctx->int_signal_send = sig;
1764  }
1765  int res = REAL(pthread_kill)(tid, sig);
1766  if (tid == pthread_self()) {
1767    CHECK_EQ(sctx->int_signal_send, sig);
1768    sctx->int_signal_send = prev;
1769  }
1770  return res;
1771}
1772
1773TSAN_INTERCEPTOR(int, gettimeofday, void *tv, void *tz) {
1774  SCOPED_TSAN_INTERCEPTOR(gettimeofday, tv, tz);
1775  // It's intercepted merely to process pending signals.
1776  return REAL(gettimeofday)(tv, tz);
1777}
1778
1779TSAN_INTERCEPTOR(int, getaddrinfo, void *node, void *service,
1780    void *hints, void *rv) {
1781  SCOPED_TSAN_INTERCEPTOR(getaddrinfo, node, service, hints, rv);
1782  // We miss atomic synchronization in getaddrinfo,
1783  // and can report false race between malloc and free
1784  // inside of getaddrinfo. So ignore memory accesses.
1785  ThreadIgnoreBegin(thr);
1786  // getaddrinfo calls fopen, which can be intercepted by user.
1787  thr->in_rtl--;
1788  CHECK_EQ(thr->in_rtl, 0);
1789  int res = REAL(getaddrinfo)(node, service, hints, rv);
1790  thr->in_rtl++;
1791  ThreadIgnoreEnd(thr);
1792  return res;
1793}
1794
1795// Linux kernel has a bug that leads to kernel deadlock if a process
1796// maps TBs of memory and then calls mlock().
1797static void MlockIsUnsupported() {
1798  static atomic_uint8_t printed;
1799  if (atomic_exchange(&printed, 1, memory_order_relaxed))
1800    return;
1801  if (flags()->verbosity > 0)
1802    Printf("INFO: ThreadSanitizer ignores mlock/mlockall/munlock/munlockall\n");
1803}
1804
1805TSAN_INTERCEPTOR(int, mlock, const void *addr, uptr len) {
1806  MlockIsUnsupported();
1807  return 0;
1808}
1809
1810TSAN_INTERCEPTOR(int, munlock, const void *addr, uptr len) {
1811  MlockIsUnsupported();
1812  return 0;
1813}
1814
1815TSAN_INTERCEPTOR(int, mlockall, int flags) {
1816  MlockIsUnsupported();
1817  return 0;
1818}
1819
1820TSAN_INTERCEPTOR(int, munlockall, void) {
1821  MlockIsUnsupported();
1822  return 0;
1823}
1824
1825TSAN_INTERCEPTOR(int, fork, int fake) {
1826  SCOPED_TSAN_INTERCEPTOR(fork, fake);
1827  int pid = REAL(fork)(fake);
1828  if (pid == 0) {
1829    // child
1830    FdOnFork(thr, pc);
1831  } else if (pid > 0) {
1832    // parent
1833  }
1834  return pid;
1835}
1836
1837struct TsanInterceptorContext {
1838  ThreadState *thr;
1839  const uptr caller_pc;
1840  const uptr pc;
1841};
1842
1843#include "sanitizer_common/sanitizer_platform_interceptors.h"
1844// Causes interceptor recursion (getpwuid_r() calls fopen())
1845#undef SANITIZER_INTERCEPT_GETPWNAM_AND_FRIENDS
1846#undef SANITIZER_INTERCEPT_GETPWNAM_R_AND_FRIENDS
1847// Causes interceptor recursion (getaddrinfo() and fopen())
1848#undef SANITIZER_INTERCEPT_GETADDRINFO
1849#undef SANITIZER_INTERCEPT_GETNAMEINFO
1850// Causes interceptor recursion (glob64() calls lstat64())
1851#undef SANITIZER_INTERCEPT_GLOB
1852
1853#define COMMON_INTERCEPTOR_UNPOISON_PARAM(ctx, count) \
1854  do {                                                \
1855  } while (false)
1856#define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size)                    \
1857  MemoryAccessRange(((TsanInterceptorContext *)ctx)->thr,                 \
1858                    ((TsanInterceptorContext *)ctx)->pc, (uptr)ptr, size, \
1859                    true)
1860#define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size)                       \
1861  MemoryAccessRange(((TsanInterceptorContext *) ctx)->thr,                  \
1862                    ((TsanInterceptorContext *) ctx)->pc, (uptr) ptr, size, \
1863                    false)
1864#define COMMON_INTERCEPTOR_ENTER(ctx, func, ...)      \
1865  SCOPED_TSAN_INTERCEPTOR(func, __VA_ARGS__);         \
1866  TsanInterceptorContext _ctx = {thr, caller_pc, pc}; \
1867  ctx = (void *)&_ctx;                                \
1868  (void) ctx;
1869#define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \
1870  FdAcquire(((TsanInterceptorContext *) ctx)->thr, pc, fd)
1871#define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \
1872  FdRelease(((TsanInterceptorContext *) ctx)->thr, pc, fd)
1873#define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd) \
1874  FdSocketAccept(((TsanInterceptorContext *) ctx)->thr, pc, fd, newfd)
1875#define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) \
1876  ThreadSetName(((TsanInterceptorContext *) ctx)->thr, name)
1877#define COMMON_INTERCEPTOR_BLOCK_REAL(name) BLOCK_REAL(name)
1878#include "sanitizer_common/sanitizer_common_interceptors.inc"
1879
1880#define TSAN_SYSCALL() \
1881  ThreadState *thr = cur_thread(); \
1882  ScopedSyscall scoped_syscall(thr) \
1883/**/
1884
1885struct ScopedSyscall {
1886  ThreadState *thr;
1887
1888  explicit ScopedSyscall(ThreadState *thr)
1889      : thr(thr) {
1890    if (thr->in_rtl == 0)
1891      Initialize(thr);
1892    thr->in_rtl++;
1893  }
1894
1895  ~ScopedSyscall() {
1896    thr->in_rtl--;
1897    if (thr->in_rtl == 0)
1898      ProcessPendingSignals(thr);
1899  }
1900};
1901
1902static void syscall_access_range(uptr pc, uptr p, uptr s, bool write) {
1903  TSAN_SYSCALL();
1904  MemoryAccessRange(thr, pc, p, s, write);
1905}
1906
1907static void syscall_fd_close(uptr pc, int fd) {
1908  TSAN_SYSCALL();
1909  if (fd >= 0)
1910    FdClose(thr, pc, fd);
1911}
1912
1913static void syscall_pre_fork(uptr pc) {
1914  TSAN_SYSCALL();
1915}
1916
1917static void syscall_post_fork(uptr pc, int res) {
1918  TSAN_SYSCALL();
1919  if (res == 0) {
1920    // child
1921    FdOnFork(thr, pc);
1922  } else if (res > 0) {
1923    // parent
1924  }
1925}
1926
1927#define COMMON_SYSCALL_PRE_READ_RANGE(p, s) \
1928  syscall_access_range(GET_CALLER_PC(), (uptr)(p), (uptr)(s), false)
1929#define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) \
1930  syscall_access_range(GET_CALLER_PC(), (uptr)(p), (uptr)(s), true)
1931#define COMMON_SYSCALL_POST_READ_RANGE(p, s) \
1932  do { } while (false)
1933#define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) \
1934  do { } while (false)
1935#define COMMON_SYSCALL_FD_CLOSE(fd) \
1936  syscall_fd_close(GET_CALLER_PC(), fd)
1937#define COMMON_SYSCALL_PRE_FORK() \
1938  syscall_pre_fork(GET_CALLER_PC())
1939#define COMMON_SYSCALL_POST_FORK(res) \
1940  syscall_post_fork(GET_CALLER_PC(), res)
1941#include "sanitizer_common/sanitizer_common_syscalls.inc"
1942
1943namespace __tsan {
1944
1945void ProcessPendingSignals(ThreadState *thr) {
1946  CHECK_EQ(thr->in_rtl, 0);
1947  SignalContext *sctx = SigCtx(thr);
1948  if (sctx == 0 || sctx->pending_signal_count == 0 || thr->in_signal_handler)
1949    return;
1950  Context *ctx = CTX();
1951  thr->in_signal_handler = true;
1952  sctx->pending_signal_count = 0;
1953  // These are too big for stack.
1954  static THREADLOCAL sigset_t emptyset, oldset;
1955  sigfillset(&emptyset);
1956  pthread_sigmask(SIG_SETMASK, &emptyset, &oldset);
1957  for (int sig = 0; sig < kSigCount; sig++) {
1958    SignalDesc *signal = &sctx->pending_signals[sig];
1959    if (signal->armed) {
1960      signal->armed = false;
1961      if (sigactions[sig].sa_handler != SIG_DFL
1962          && sigactions[sig].sa_handler != SIG_IGN) {
1963        // Insure that the handler does not spoil errno.
1964        const int saved_errno = errno;
1965        errno = 0;
1966        if (signal->sigaction)
1967          sigactions[sig].sa_sigaction(sig, &signal->siginfo, &signal->ctx);
1968        else
1969          sigactions[sig].sa_handler(sig);
1970        if (flags()->report_bugs && errno != 0) {
1971          ScopedInRtl in_rtl;
1972          __tsan::StackTrace stack;
1973          uptr pc = signal->sigaction ?
1974              (uptr)sigactions[sig].sa_sigaction :
1975              (uptr)sigactions[sig].sa_handler;
1976          pc += 1;  // return address is expected, OutputReport() will undo this
1977          stack.Init(&pc, 1);
1978          ThreadRegistryLock l(ctx->thread_registry);
1979          ScopedReport rep(ReportTypeErrnoInSignal);
1980          if (!IsFiredSuppression(ctx, rep, stack)) {
1981            rep.AddStack(&stack);
1982            OutputReport(ctx, rep, rep.GetReport()->stacks[0]);
1983          }
1984        }
1985        errno = saved_errno;
1986      }
1987    }
1988  }
1989  pthread_sigmask(SIG_SETMASK, &oldset, 0);
1990  CHECK_EQ(thr->in_signal_handler, true);
1991  thr->in_signal_handler = false;
1992}
1993
1994static void finalize(void *arg) {
1995  ThreadState * thr = cur_thread();
1996  uptr pc = 0;
1997  atexit_ctx->exit(thr, pc);
1998  int status = Finalize(cur_thread());
1999  REAL(fflush)(0);
2000  if (status)
2001    _exit(status);
2002}
2003
2004static void unreachable() {
2005  Printf("FATAL: ThreadSanitizer: unreachable called\n");
2006  Die();
2007}
2008
2009void InitializeInterceptors() {
2010  CHECK_GT(cur_thread()->in_rtl, 0);
2011
2012  // We need to setup it early, because functions like dlsym() can call it.
2013  REAL(memset) = internal_memset;
2014  REAL(memcpy) = internal_memcpy;
2015  REAL(memcmp) = internal_memcmp;
2016
2017  // Instruct libc malloc to consume less memory.
2018  mallopt(1, 0);  // M_MXFAST
2019  mallopt(-3, 32*1024);  // M_MMAP_THRESHOLD
2020
2021  SANITIZER_COMMON_INTERCEPTORS_INIT;
2022
2023  TSAN_INTERCEPT(setjmp);
2024  TSAN_INTERCEPT(_setjmp);
2025  TSAN_INTERCEPT(sigsetjmp);
2026  TSAN_INTERCEPT(__sigsetjmp);
2027  TSAN_INTERCEPT(longjmp);
2028  TSAN_INTERCEPT(siglongjmp);
2029
2030  TSAN_INTERCEPT(malloc);
2031  TSAN_INTERCEPT(__libc_memalign);
2032  TSAN_INTERCEPT(calloc);
2033  TSAN_INTERCEPT(realloc);
2034  TSAN_INTERCEPT(free);
2035  TSAN_INTERCEPT(cfree);
2036  TSAN_INTERCEPT(mmap);
2037  TSAN_INTERCEPT(mmap64);
2038  TSAN_INTERCEPT(munmap);
2039  TSAN_INTERCEPT(memalign);
2040  TSAN_INTERCEPT(valloc);
2041  TSAN_INTERCEPT(pvalloc);
2042  TSAN_INTERCEPT(posix_memalign);
2043
2044  TSAN_INTERCEPT(strlen);
2045  TSAN_INTERCEPT(memset);
2046  TSAN_INTERCEPT(memcpy);
2047  TSAN_INTERCEPT(memchr);
2048  TSAN_INTERCEPT(memrchr);
2049  TSAN_INTERCEPT(memmove);
2050  TSAN_INTERCEPT(memcmp);
2051  TSAN_INTERCEPT(strchr);
2052  TSAN_INTERCEPT(strchrnul);
2053  TSAN_INTERCEPT(strrchr);
2054  TSAN_INTERCEPT(strcpy);  // NOLINT
2055  TSAN_INTERCEPT(strncpy);
2056  TSAN_INTERCEPT(strstr);
2057  TSAN_INTERCEPT(strdup);
2058
2059  TSAN_INTERCEPT(pthread_create);
2060  TSAN_INTERCEPT(pthread_join);
2061  TSAN_INTERCEPT(pthread_detach);
2062
2063  TSAN_INTERCEPT(pthread_mutex_init);
2064  TSAN_INTERCEPT(pthread_mutex_destroy);
2065  TSAN_INTERCEPT(pthread_mutex_lock);
2066  TSAN_INTERCEPT(pthread_mutex_trylock);
2067  TSAN_INTERCEPT(pthread_mutex_timedlock);
2068  TSAN_INTERCEPT(pthread_mutex_unlock);
2069
2070  TSAN_INTERCEPT(pthread_spin_init);
2071  TSAN_INTERCEPT(pthread_spin_destroy);
2072  TSAN_INTERCEPT(pthread_spin_lock);
2073  TSAN_INTERCEPT(pthread_spin_trylock);
2074  TSAN_INTERCEPT(pthread_spin_unlock);
2075
2076  TSAN_INTERCEPT(pthread_rwlock_init);
2077  TSAN_INTERCEPT(pthread_rwlock_destroy);
2078  TSAN_INTERCEPT(pthread_rwlock_rdlock);
2079  TSAN_INTERCEPT(pthread_rwlock_tryrdlock);
2080  TSAN_INTERCEPT(pthread_rwlock_timedrdlock);
2081  TSAN_INTERCEPT(pthread_rwlock_wrlock);
2082  TSAN_INTERCEPT(pthread_rwlock_trywrlock);
2083  TSAN_INTERCEPT(pthread_rwlock_timedwrlock);
2084  TSAN_INTERCEPT(pthread_rwlock_unlock);
2085
2086  INTERCEPT_FUNCTION_VER(pthread_cond_init, GLIBC_2.3.2);
2087  INTERCEPT_FUNCTION_VER(pthread_cond_destroy, GLIBC_2.3.2);
2088  INTERCEPT_FUNCTION_VER(pthread_cond_signal, GLIBC_2.3.2);
2089  INTERCEPT_FUNCTION_VER(pthread_cond_broadcast, GLIBC_2.3.2);
2090  INTERCEPT_FUNCTION_VER(pthread_cond_wait, GLIBC_2.3.2);
2091  INTERCEPT_FUNCTION_VER(pthread_cond_timedwait, GLIBC_2.3.2);
2092
2093  TSAN_INTERCEPT(pthread_barrier_init);
2094  TSAN_INTERCEPT(pthread_barrier_destroy);
2095  TSAN_INTERCEPT(pthread_barrier_wait);
2096
2097  TSAN_INTERCEPT(pthread_once);
2098
2099  TSAN_INTERCEPT(sem_init);
2100  TSAN_INTERCEPT(sem_destroy);
2101  TSAN_INTERCEPT(sem_wait);
2102  TSAN_INTERCEPT(sem_trywait);
2103  TSAN_INTERCEPT(sem_timedwait);
2104  TSAN_INTERCEPT(sem_post);
2105  TSAN_INTERCEPT(sem_getvalue);
2106
2107  TSAN_INTERCEPT(stat);
2108  TSAN_INTERCEPT(__xstat);
2109  TSAN_INTERCEPT(stat64);
2110  TSAN_INTERCEPT(__xstat64);
2111  TSAN_INTERCEPT(lstat);
2112  TSAN_INTERCEPT(__lxstat);
2113  TSAN_INTERCEPT(lstat64);
2114  TSAN_INTERCEPT(__lxstat64);
2115  TSAN_INTERCEPT(fstat);
2116  TSAN_INTERCEPT(__fxstat);
2117  TSAN_INTERCEPT(fstat64);
2118  TSAN_INTERCEPT(__fxstat64);
2119  TSAN_INTERCEPT(open);
2120  TSAN_INTERCEPT(open64);
2121  TSAN_INTERCEPT(creat);
2122  TSAN_INTERCEPT(creat64);
2123  TSAN_INTERCEPT(dup);
2124  TSAN_INTERCEPT(dup2);
2125  TSAN_INTERCEPT(dup3);
2126  TSAN_INTERCEPT(eventfd);
2127  TSAN_INTERCEPT(signalfd);
2128  TSAN_INTERCEPT(inotify_init);
2129  TSAN_INTERCEPT(inotify_init1);
2130  TSAN_INTERCEPT(socket);
2131  TSAN_INTERCEPT(socketpair);
2132  TSAN_INTERCEPT(connect);
2133  TSAN_INTERCEPT(bind);
2134  TSAN_INTERCEPT(listen);
2135  TSAN_INTERCEPT(epoll_create);
2136  TSAN_INTERCEPT(epoll_create1);
2137  TSAN_INTERCEPT(close);
2138  TSAN_INTERCEPT(__close);
2139  TSAN_INTERCEPT(__res_iclose);
2140  TSAN_INTERCEPT(pipe);
2141  TSAN_INTERCEPT(pipe2);
2142
2143  TSAN_INTERCEPT(send);
2144  TSAN_INTERCEPT(sendmsg);
2145  TSAN_INTERCEPT(recv);
2146
2147  TSAN_INTERCEPT(unlink);
2148  TSAN_INTERCEPT(fopen);
2149  TSAN_INTERCEPT(freopen);
2150  TSAN_INTERCEPT(fclose);
2151  TSAN_INTERCEPT(fread);
2152  TSAN_INTERCEPT(fwrite);
2153  TSAN_INTERCEPT(fflush);
2154  TSAN_INTERCEPT(abort);
2155  TSAN_INTERCEPT(puts);
2156  TSAN_INTERCEPT(rmdir);
2157  TSAN_INTERCEPT(opendir);
2158
2159  TSAN_INTERCEPT(epoll_ctl);
2160  TSAN_INTERCEPT(epoll_wait);
2161
2162  TSAN_INTERCEPT(sigaction);
2163  TSAN_INTERCEPT(signal);
2164  TSAN_INTERCEPT(sigsuspend);
2165  TSAN_INTERCEPT(raise);
2166  TSAN_INTERCEPT(kill);
2167  TSAN_INTERCEPT(pthread_kill);
2168  TSAN_INTERCEPT(sleep);
2169  TSAN_INTERCEPT(usleep);
2170  TSAN_INTERCEPT(nanosleep);
2171  TSAN_INTERCEPT(gettimeofday);
2172  TSAN_INTERCEPT(getaddrinfo);
2173
2174  TSAN_INTERCEPT(mlock);
2175  TSAN_INTERCEPT(munlock);
2176  TSAN_INTERCEPT(mlockall);
2177  TSAN_INTERCEPT(munlockall);
2178
2179  TSAN_INTERCEPT(fork);
2180  TSAN_INTERCEPT(on_exit);
2181  TSAN_INTERCEPT(__cxa_atexit);
2182
2183  // Need to setup it, because interceptors check that the function is resolved.
2184  // But atexit is emitted directly into the module, so can't be resolved.
2185  REAL(atexit) = (int(*)(void(*)()))unreachable;
2186  atexit_ctx = new(internal_alloc(MBlockAtExit, sizeof(AtExitContext)))
2187      AtExitContext();
2188
2189  if (REAL(__cxa_atexit)(&finalize, 0, 0)) {
2190    Printf("ThreadSanitizer: failed to setup atexit callback\n");
2191    Die();
2192  }
2193
2194  if (pthread_key_create(&g_thread_finalize_key, &thread_finalize)) {
2195    Printf("ThreadSanitizer: failed to create thread key\n");
2196    Die();
2197  }
2198
2199  FdInit();
2200}
2201
2202void internal_start_thread(void(*func)(void *arg), void *arg) {
2203  void *th;
2204  REAL(pthread_create)(&th, 0, (void*(*)(void *arg))func, arg);
2205  REAL(pthread_detach)(th);
2206}
2207
2208}  // namespace __tsan
2209