tsan_interceptors.cc revision 58dc8bef3f86f4f8503359b5146be9d78d7e3ef0 
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_suppressions.h"
26#include "tsan_rtl.h"
27#include "tsan_mman.h"
28#include "tsan_fd.h"
29
30using namespace __tsan;  // NOLINT
31
32const int kSigCount = 64;
33
34struct my_siginfo_t {
35  // The size is determined by looking at sizeof of real siginfo_t on linux.
36  u64 opaque[128 / sizeof(u64)];
37};
38
39struct ucontext_t {
40  // The size is determined by looking at sizeof of real ucontext_t on linux.
41  u64 opaque[936 / sizeof(u64) + 1];
42};
43
44extern "C" int pthread_attr_init(void *attr);
45extern "C" int pthread_attr_destroy(void *attr);
46DECLARE_REAL(int, pthread_attr_getdetachstate, void *, void *)
47extern "C" int pthread_attr_setstacksize(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// The object is 64-byte aligned, because we want hot data to be located in
130// a single cache line if possible (it's accessed in every interceptor).
131static ALIGNED(64) char libignore_placeholder[sizeof(LibIgnore)];
132static LibIgnore *libignore() {
133  return reinterpret_cast<LibIgnore*>(&libignore_placeholder[0]);
134}
135
136void InitializeLibIgnore() {
137  libignore()->Init(*GetSuppressionContext());
138  libignore()->OnLibraryLoaded(0);
139}
140
141}  // namespace __tsan
142
143static SignalContext *SigCtx(ThreadState *thr) {
144  SignalContext *ctx = (SignalContext*)thr->signal_ctx;
145  if (ctx == 0 && thr->is_alive) {
146    ScopedInRtl in_rtl;
147    ctx = (SignalContext*)MmapOrDie(sizeof(*ctx), "SignalContext");
148    MemoryResetRange(thr, (uptr)&SigCtx, (uptr)ctx, sizeof(*ctx));
149    thr->signal_ctx = ctx;
150  }
151  return ctx;
152}
153
154static unsigned g_thread_finalize_key;
155
156class ScopedInterceptor {
157 public:
158  ScopedInterceptor(ThreadState *thr, const char *fname, uptr pc);
159  ~ScopedInterceptor();
160 private:
161  ThreadState *const thr_;
162  const int in_rtl_;
163  bool in_ignored_lib_;
164};
165
166ScopedInterceptor::ScopedInterceptor(ThreadState *thr, const char *fname,
167                                     uptr pc)
168    : thr_(thr)
169    , in_rtl_(thr->in_rtl)
170    , in_ignored_lib_(false) {
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  if (!thr_->in_ignored_lib && libignore()->IsIgnored(pc)) {
180    in_ignored_lib_ = true;
181    thr_->in_ignored_lib = true;
182    ThreadIgnoreBegin(thr_);
183  }
184}
185
186ScopedInterceptor::~ScopedInterceptor() {
187  if (in_ignored_lib_) {
188    thr_->in_ignored_lib = false;
189    ThreadIgnoreEnd(thr_);
190  }
191  thr_->in_rtl--;
192  if (thr_->in_rtl == 0) {
193    FuncExit(thr_);
194    ProcessPendingSignals(thr_);
195  }
196  CHECK_EQ(in_rtl_, thr_->in_rtl);
197}
198
199#define SCOPED_INTERCEPTOR_RAW(func, ...) \
200    ThreadState *thr = cur_thread(); \
201    StatInc(thr, StatInterceptor); \
202    StatInc(thr, StatInt_##func); \
203    const uptr caller_pc = GET_CALLER_PC(); \
204    ScopedInterceptor si(thr, #func, caller_pc); \
205    const uptr pc = __sanitizer::StackTrace::GetCurrentPc(); \
206    (void)pc; \
207/**/
208
209#define SCOPED_TSAN_INTERCEPTOR(func, ...) \
210    SCOPED_INTERCEPTOR_RAW(func, __VA_ARGS__); \
211    if (REAL(func) == 0) { \
212      Printf("FATAL: ThreadSanitizer: failed to intercept %s\n", #func); \
213      Die(); \
214    } \
215    if (thr->in_rtl > 1 || thr->in_ignored_lib) \
216      return REAL(func)(__VA_ARGS__); \
217/**/
218
219#define TSAN_INTERCEPTOR(ret, func, ...) INTERCEPTOR(ret, func, __VA_ARGS__)
220#define TSAN_INTERCEPT(func) INTERCEPT_FUNCTION(func)
221
222#define BLOCK_REAL(name) (BlockingCall(thr), REAL(name))
223
224struct BlockingCall {
225  explicit BlockingCall(ThreadState *thr)
226      : ctx(SigCtx(thr)) {
227    ctx->in_blocking_func++;
228  }
229
230  ~BlockingCall() {
231    ctx->in_blocking_func--;
232  }
233
234  SignalContext *ctx;
235};
236
237TSAN_INTERCEPTOR(unsigned, sleep, unsigned sec) {
238  SCOPED_TSAN_INTERCEPTOR(sleep, sec);
239  unsigned res = BLOCK_REAL(sleep)(sec);
240  AfterSleep(thr, pc);
241  return res;
242}
243
244TSAN_INTERCEPTOR(int, usleep, long_t usec) {
245  SCOPED_TSAN_INTERCEPTOR(usleep, usec);
246  int res = BLOCK_REAL(usleep)(usec);
247  AfterSleep(thr, pc);
248  return res;
249}
250
251TSAN_INTERCEPTOR(int, nanosleep, void *req, void *rem) {
252  SCOPED_TSAN_INTERCEPTOR(nanosleep, req, rem);
253  int res = BLOCK_REAL(nanosleep)(req, rem);
254  AfterSleep(thr, pc);
255  return res;
256}
257
258TSAN_INTERCEPTOR(void*, dlopen, const char *filename, int flag) {
259  SCOPED_INTERCEPTOR_RAW(dlopen, filename, flag);
260  // dlopen will execute global constructors, so it must be not in rtl.
261  CHECK_EQ(thr->in_rtl, 1);
262  thr->in_rtl = 0;
263  void *res = REAL(dlopen)(filename, flag);
264  thr->in_rtl = 1;
265  libignore()->OnLibraryLoaded(filename);
266  return res;
267}
268
269TSAN_INTERCEPTOR(int, dlclose, void *handle) {
270  SCOPED_INTERCEPTOR_RAW(dlclose, handle);
271  // dlclose will execute global destructors, so it must be not in rtl.
272  CHECK_EQ(thr->in_rtl, 1);
273  thr->in_rtl = 0;
274  int res = REAL(dlclose)(handle);
275  thr->in_rtl = 1;
276  libignore()->OnLibraryUnloaded();
277  return res;
278}
279
280class AtExitContext {
281 public:
282  AtExitContext()
283    : mtx_(MutexTypeAtExit, StatMtxAtExit)
284    , pos_() {
285  }
286
287  typedef void(*atexit_t)();
288
289  int atexit(ThreadState *thr, uptr pc, bool is_on_exit,
290             atexit_t f, void *arg) {
291    Lock l(&mtx_);
292    if (pos_ == kMaxAtExit)
293      return 1;
294    Release(thr, pc, (uptr)this);
295    stack_[pos_] = f;
296    args_[pos_] = arg;
297    is_on_exits_[pos_] = is_on_exit;
298    pos_++;
299    return 0;
300  }
301
302  void exit(ThreadState *thr, uptr pc) {
303    CHECK_EQ(thr->in_rtl, 0);
304    for (;;) {
305      atexit_t f = 0;
306      void *arg = 0;
307      bool is_on_exit = false;
308      {
309        Lock l(&mtx_);
310        if (pos_) {
311          pos_--;
312          f = stack_[pos_];
313          arg = args_[pos_];
314          is_on_exit = is_on_exits_[pos_];
315          ScopedInRtl in_rtl;
316          Acquire(thr, pc, (uptr)this);
317        }
318      }
319      if (f == 0)
320        break;
321      DPrintf("#%d: executing atexit func %p\n", thr->tid, f);
322      CHECK_EQ(thr->in_rtl, 0);
323      if (is_on_exit)
324        ((void(*)(int status, void *arg))f)(0, arg);
325      else
326        ((void(*)(void *arg, void *dso))f)(arg, 0);
327    }
328  }
329
330 private:
331  static const int kMaxAtExit = 128;
332  Mutex mtx_;
333  atexit_t stack_[kMaxAtExit];
334  void *args_[kMaxAtExit];
335  bool is_on_exits_[kMaxAtExit];
336  int pos_;
337};
338
339static AtExitContext *atexit_ctx;
340
341TSAN_INTERCEPTOR(int, atexit, void (*f)()) {
342  if (cur_thread()->in_symbolizer)
343    return 0;
344  SCOPED_TSAN_INTERCEPTOR(atexit, f);
345  return atexit_ctx->atexit(thr, pc, false, (void(*)())f, 0);
346}
347
348TSAN_INTERCEPTOR(int, on_exit, void(*f)(int, void*), void *arg) {
349  if (cur_thread()->in_symbolizer)
350    return 0;
351  SCOPED_TSAN_INTERCEPTOR(on_exit, f, arg);
352  return atexit_ctx->atexit(thr, pc, true, (void(*)())f, arg);
353}
354
355TSAN_INTERCEPTOR(int, __cxa_atexit, void (*f)(void *a), void *arg, void *dso) {
356  if (cur_thread()->in_symbolizer)
357    return 0;
358  SCOPED_TSAN_INTERCEPTOR(__cxa_atexit, f, arg, dso);
359  if (dso) {
360    // Memory allocation in __cxa_atexit will race with free during exit,
361    // because we do not see synchronization around atexit callback list.
362    ThreadIgnoreBegin(thr);
363    int res = REAL(__cxa_atexit)(f, arg, dso);
364    ThreadIgnoreEnd(thr);
365    return res;
366  }
367  return atexit_ctx->atexit(thr, pc, false, (void(*)())f, arg);
368}
369
370// Cleanup old bufs.
371static void JmpBufGarbageCollect(ThreadState *thr, uptr sp) {
372  for (uptr i = 0; i < thr->jmp_bufs.Size(); i++) {
373    JmpBuf *buf = &thr->jmp_bufs[i];
374    if (buf->sp <= sp) {
375      uptr sz = thr->jmp_bufs.Size();
376      thr->jmp_bufs[i] = thr->jmp_bufs[sz - 1];
377      thr->jmp_bufs.PopBack();
378      i--;
379    }
380  }
381}
382
383static void SetJmp(ThreadState *thr, uptr sp, uptr mangled_sp) {
384  if (thr->shadow_stack_pos == 0)  // called from libc guts during bootstrap
385    return;
386  // Cleanup old bufs.
387  JmpBufGarbageCollect(thr, sp);
388  // Remember the buf.
389  JmpBuf *buf = thr->jmp_bufs.PushBack();
390  buf->sp = sp;
391  buf->mangled_sp = mangled_sp;
392  buf->shadow_stack_pos = thr->shadow_stack_pos;
393}
394
395static void LongJmp(ThreadState *thr, uptr *env) {
396  uptr mangled_sp = env[6];
397  // Find the saved buf by mangled_sp.
398  for (uptr i = 0; i < thr->jmp_bufs.Size(); i++) {
399    JmpBuf *buf = &thr->jmp_bufs[i];
400    if (buf->mangled_sp == mangled_sp) {
401      CHECK_GE(thr->shadow_stack_pos, buf->shadow_stack_pos);
402      // Unwind the stack.
403      while (thr->shadow_stack_pos > buf->shadow_stack_pos)
404        FuncExit(thr);
405      JmpBufGarbageCollect(thr, buf->sp - 1);  // do not collect buf->sp
406      return;
407    }
408  }
409  Printf("ThreadSanitizer: can't find longjmp buf\n");
410  CHECK(0);
411}
412
413// FIXME: put everything below into a common extern "C" block?
414extern "C" void __tsan_setjmp(uptr sp, uptr mangled_sp) {
415  ScopedInRtl in_rtl;
416  SetJmp(cur_thread(), sp, mangled_sp);
417}
418
419// Not called.  Merely to satisfy TSAN_INTERCEPT().
420extern "C" SANITIZER_INTERFACE_ATTRIBUTE
421int __interceptor_setjmp(void *env);
422extern "C" int __interceptor_setjmp(void *env) {
423  CHECK(0);
424  return 0;
425}
426
427// FIXME: any reason to have a separate declaration?
428extern "C" SANITIZER_INTERFACE_ATTRIBUTE
429int __interceptor__setjmp(void *env);
430extern "C" int __interceptor__setjmp(void *env) {
431  CHECK(0);
432  return 0;
433}
434
435extern "C" SANITIZER_INTERFACE_ATTRIBUTE
436int __interceptor_sigsetjmp(void *env);
437extern "C" int __interceptor_sigsetjmp(void *env) {
438  CHECK(0);
439  return 0;
440}
441
442extern "C" SANITIZER_INTERFACE_ATTRIBUTE
443int __interceptor___sigsetjmp(void *env);
444extern "C" int __interceptor___sigsetjmp(void *env) {
445  CHECK(0);
446  return 0;
447}
448
449extern "C" int setjmp(void *env);
450extern "C" int _setjmp(void *env);
451extern "C" int sigsetjmp(void *env);
452extern "C" int __sigsetjmp(void *env);
453DEFINE_REAL(int, setjmp, void *env)
454DEFINE_REAL(int, _setjmp, void *env)
455DEFINE_REAL(int, sigsetjmp, void *env)
456DEFINE_REAL(int, __sigsetjmp, void *env)
457
458TSAN_INTERCEPTOR(void, longjmp, uptr *env, int val) {
459  {
460    SCOPED_TSAN_INTERCEPTOR(longjmp, env, val);
461  }
462  LongJmp(cur_thread(), env);
463  REAL(longjmp)(env, val);
464}
465
466TSAN_INTERCEPTOR(void, siglongjmp, uptr *env, int val) {
467  {
468    SCOPED_TSAN_INTERCEPTOR(siglongjmp, env, val);
469  }
470  LongJmp(cur_thread(), env);
471  REAL(siglongjmp)(env, val);
472}
473
474TSAN_INTERCEPTOR(void*, malloc, uptr size) {
475  if (cur_thread()->in_symbolizer)
476    return __libc_malloc(size);
477  void *p = 0;
478  {
479    SCOPED_INTERCEPTOR_RAW(malloc, size);
480    p = user_alloc(thr, pc, size);
481  }
482  invoke_malloc_hook(p, size);
483  return p;
484}
485
486TSAN_INTERCEPTOR(void*, __libc_memalign, uptr align, uptr sz) {
487  SCOPED_TSAN_INTERCEPTOR(__libc_memalign, align, sz);
488  return user_alloc(thr, pc, sz, align);
489}
490
491TSAN_INTERCEPTOR(void*, calloc, uptr size, uptr n) {
492  if (cur_thread()->in_symbolizer)
493    return __libc_calloc(size, n);
494  if (__sanitizer::CallocShouldReturnNullDueToOverflow(size, n))
495    return AllocatorReturnNull();
496  void *p = 0;
497  {
498    SCOPED_INTERCEPTOR_RAW(calloc, size, n);
499    p = user_alloc(thr, pc, n * size);
500    if (p)
501      internal_memset(p, 0, n * size);
502  }
503  invoke_malloc_hook(p, n * size);
504  return p;
505}
506
507TSAN_INTERCEPTOR(void*, realloc, void *p, uptr size) {
508  if (cur_thread()->in_symbolizer)
509    return __libc_realloc(p, size);
510  if (p)
511    invoke_free_hook(p);
512  {
513    SCOPED_INTERCEPTOR_RAW(realloc, p, size);
514    p = user_realloc(thr, pc, p, size);
515  }
516  invoke_malloc_hook(p, size);
517  return p;
518}
519
520TSAN_INTERCEPTOR(void, free, void *p) {
521  if (p == 0)
522    return;
523  if (cur_thread()->in_symbolizer)
524    return __libc_free(p);
525  invoke_free_hook(p);
526  SCOPED_INTERCEPTOR_RAW(free, p);
527  user_free(thr, pc, p);
528}
529
530TSAN_INTERCEPTOR(void, cfree, void *p) {
531  if (p == 0)
532    return;
533  if (cur_thread()->in_symbolizer)
534    return __libc_free(p);
535  invoke_free_hook(p);
536  SCOPED_INTERCEPTOR_RAW(cfree, p);
537  user_free(thr, pc, p);
538}
539
540TSAN_INTERCEPTOR(uptr, malloc_usable_size, void *p) {
541  SCOPED_INTERCEPTOR_RAW(malloc_usable_size, p);
542  return user_alloc_usable_size(thr, pc, p);
543}
544
545#define OPERATOR_NEW_BODY(mangled_name) \
546  if (cur_thread()->in_symbolizer) \
547    return __libc_malloc(size); \
548  void *p = 0; \
549  {  \
550    SCOPED_INTERCEPTOR_RAW(mangled_name, size); \
551    p = user_alloc(thr, pc, size); \
552  }  \
553  invoke_malloc_hook(p, size);  \
554  return p;
555
556SANITIZER_INTERFACE_ATTRIBUTE
557void *operator new(__sanitizer::uptr size);
558void *operator new(__sanitizer::uptr size) {
559  OPERATOR_NEW_BODY(_Znwm);
560}
561
562SANITIZER_INTERFACE_ATTRIBUTE
563void *operator new[](__sanitizer::uptr size);
564void *operator new[](__sanitizer::uptr size) {
565  OPERATOR_NEW_BODY(_Znam);
566}
567
568SANITIZER_INTERFACE_ATTRIBUTE
569void *operator new(__sanitizer::uptr size, std::nothrow_t const&);
570void *operator new(__sanitizer::uptr size, std::nothrow_t const&) {
571  OPERATOR_NEW_BODY(_ZnwmRKSt9nothrow_t);
572}
573
574SANITIZER_INTERFACE_ATTRIBUTE
575void *operator new[](__sanitizer::uptr size, std::nothrow_t const&);
576void *operator new[](__sanitizer::uptr size, std::nothrow_t const&) {
577  OPERATOR_NEW_BODY(_ZnamRKSt9nothrow_t);
578}
579
580#define OPERATOR_DELETE_BODY(mangled_name) \
581  if (ptr == 0) return;  \
582  if (cur_thread()->in_symbolizer) \
583    return __libc_free(ptr); \
584  invoke_free_hook(ptr);  \
585  SCOPED_INTERCEPTOR_RAW(mangled_name, ptr);  \
586  user_free(thr, pc, ptr);
587
588SANITIZER_INTERFACE_ATTRIBUTE
589void operator delete(void *ptr);
590void operator delete(void *ptr) {
591  OPERATOR_DELETE_BODY(_ZdlPv);
592}
593
594SANITIZER_INTERFACE_ATTRIBUTE
595void operator delete[](void *ptr);
596void operator delete[](void *ptr) {
597  OPERATOR_DELETE_BODY(_ZdlPvRKSt9nothrow_t);
598}
599
600SANITIZER_INTERFACE_ATTRIBUTE
601void operator delete(void *ptr, std::nothrow_t const&);
602void operator delete(void *ptr, std::nothrow_t const&) {
603  OPERATOR_DELETE_BODY(_ZdaPv);
604}
605
606SANITIZER_INTERFACE_ATTRIBUTE
607void operator delete[](void *ptr, std::nothrow_t const&);
608void operator delete[](void *ptr, std::nothrow_t const&) {
609  OPERATOR_DELETE_BODY(_ZdaPvRKSt9nothrow_t);
610}
611
612TSAN_INTERCEPTOR(uptr, strlen, const char *s) {
613  SCOPED_TSAN_INTERCEPTOR(strlen, s);
614  uptr len = internal_strlen(s);
615  MemoryAccessRange(thr, pc, (uptr)s, len + 1, false);
616  return len;
617}
618
619TSAN_INTERCEPTOR(void*, memset, void *dst, int v, uptr size) {
620  SCOPED_TSAN_INTERCEPTOR(memset, dst, v, size);
621  MemoryAccessRange(thr, pc, (uptr)dst, size, true);
622  return internal_memset(dst, v, size);
623}
624
625TSAN_INTERCEPTOR(void*, memcpy, void *dst, const void *src, uptr size) {
626  SCOPED_TSAN_INTERCEPTOR(memcpy, dst, src, size);
627  MemoryAccessRange(thr, pc, (uptr)dst, size, true);
628  MemoryAccessRange(thr, pc, (uptr)src, size, false);
629  return internal_memcpy(dst, src, size);
630}
631
632TSAN_INTERCEPTOR(int, memcmp, const void *s1, const void *s2, uptr n) {
633  SCOPED_TSAN_INTERCEPTOR(memcmp, s1, s2, n);
634  int res = 0;
635  uptr len = 0;
636  for (; len < n; len++) {
637    if ((res = ((unsigned char*)s1)[len] - ((unsigned char*)s2)[len]))
638      break;
639  }
640  MemoryAccessRange(thr, pc, (uptr)s1, len < n ? len + 1 : n, false);
641  MemoryAccessRange(thr, pc, (uptr)s2, len < n ? len + 1 : n, false);
642  return res;
643}
644
645TSAN_INTERCEPTOR(void*, memchr, void *s, int c, uptr n) {
646  SCOPED_TSAN_INTERCEPTOR(memchr, s, c, n);
647  void *res = REAL(memchr)(s, c, n);
648  uptr len = res ? (char*)res - (char*)s + 1 : n;
649  MemoryAccessRange(thr, pc, (uptr)s, len, false);
650  return res;
651}
652
653TSAN_INTERCEPTOR(void*, memrchr, char *s, int c, uptr n) {
654  SCOPED_TSAN_INTERCEPTOR(memrchr, s, c, n);
655  MemoryAccessRange(thr, pc, (uptr)s, n, false);
656  return REAL(memrchr)(s, c, n);
657}
658
659TSAN_INTERCEPTOR(void*, memmove, void *dst, void *src, uptr n) {
660  SCOPED_TSAN_INTERCEPTOR(memmove, dst, src, n);
661  MemoryAccessRange(thr, pc, (uptr)dst, n, true);
662  MemoryAccessRange(thr, pc, (uptr)src, n, false);
663  return REAL(memmove)(dst, src, n);
664}
665
666TSAN_INTERCEPTOR(char*, strchr, char *s, int c) {
667  SCOPED_TSAN_INTERCEPTOR(strchr, s, c);
668  char *res = REAL(strchr)(s, c);
669  uptr len = res ? (char*)res - (char*)s + 1 : internal_strlen(s) + 1;
670  MemoryAccessRange(thr, pc, (uptr)s, len, false);
671  return res;
672}
673
674TSAN_INTERCEPTOR(char*, strchrnul, char *s, int c) {
675  SCOPED_TSAN_INTERCEPTOR(strchrnul, s, c);
676  char *res = REAL(strchrnul)(s, c);
677  uptr len = (char*)res - (char*)s + 1;
678  MemoryAccessRange(thr, pc, (uptr)s, len, false);
679  return res;
680}
681
682TSAN_INTERCEPTOR(char*, strrchr, char *s, int c) {
683  SCOPED_TSAN_INTERCEPTOR(strrchr, s, c);
684  MemoryAccessRange(thr, pc, (uptr)s, internal_strlen(s) + 1, false);
685  return REAL(strrchr)(s, c);
686}
687
688TSAN_INTERCEPTOR(char*, strcpy, char *dst, const char *src) {  // NOLINT
689  SCOPED_TSAN_INTERCEPTOR(strcpy, dst, src);  // NOLINT
690  uptr srclen = internal_strlen(src);
691  MemoryAccessRange(thr, pc, (uptr)dst, srclen + 1, true);
692  MemoryAccessRange(thr, pc, (uptr)src, srclen + 1, false);
693  return REAL(strcpy)(dst, src);  // NOLINT
694}
695
696TSAN_INTERCEPTOR(char*, strncpy, char *dst, char *src, uptr n) {
697  SCOPED_TSAN_INTERCEPTOR(strncpy, dst, src, n);
698  uptr srclen = internal_strnlen(src, n);
699  MemoryAccessRange(thr, pc, (uptr)dst, n, true);
700  MemoryAccessRange(thr, pc, (uptr)src, min(srclen + 1, n), false);
701  return REAL(strncpy)(dst, src, n);
702}
703
704TSAN_INTERCEPTOR(const char*, strstr, const char *s1, const char *s2) {
705  SCOPED_TSAN_INTERCEPTOR(strstr, s1, s2);
706  const char *res = REAL(strstr)(s1, s2);
707  uptr len1 = internal_strlen(s1);
708  uptr len2 = internal_strlen(s2);
709  MemoryAccessRange(thr, pc, (uptr)s1, len1 + 1, false);
710  MemoryAccessRange(thr, pc, (uptr)s2, len2 + 1, false);
711  return res;
712}
713
714TSAN_INTERCEPTOR(char*, strdup, const char *str) {
715  SCOPED_TSAN_INTERCEPTOR(strdup, str);
716  // strdup will call malloc, so no instrumentation is required here.
717  return REAL(strdup)(str);
718}
719
720static bool fix_mmap_addr(void **addr, long_t sz, int flags) {
721  if (*addr) {
722    if (!IsAppMem((uptr)*addr) || !IsAppMem((uptr)*addr + sz - 1)) {
723      if (flags & MAP_FIXED) {
724        errno = EINVAL;
725        return false;
726      } else {
727        *addr = 0;
728      }
729    }
730  }
731  return true;
732}
733
734TSAN_INTERCEPTOR(void*, mmap, void *addr, long_t sz, int prot,
735                         int flags, int fd, unsigned off) {
736  SCOPED_TSAN_INTERCEPTOR(mmap, addr, sz, prot, flags, fd, off);
737  if (!fix_mmap_addr(&addr, sz, flags))
738    return MAP_FAILED;
739  void *res = REAL(mmap)(addr, sz, prot, flags, fd, off);
740  if (res != MAP_FAILED) {
741    if (fd > 0)
742      FdAccess(thr, pc, fd);
743    MemoryRangeImitateWrite(thr, pc, (uptr)res, sz);
744  }
745  return res;
746}
747
748TSAN_INTERCEPTOR(void*, mmap64, void *addr, long_t sz, int prot,
749                           int flags, int fd, u64 off) {
750  SCOPED_TSAN_INTERCEPTOR(mmap64, addr, sz, prot, flags, fd, off);
751  if (!fix_mmap_addr(&addr, sz, flags))
752    return MAP_FAILED;
753  void *res = REAL(mmap64)(addr, sz, prot, flags, fd, off);
754  if (res != MAP_FAILED) {
755    if (fd > 0)
756      FdAccess(thr, pc, fd);
757    MemoryRangeImitateWrite(thr, pc, (uptr)res, sz);
758  }
759  return res;
760}
761
762TSAN_INTERCEPTOR(int, munmap, void *addr, long_t sz) {
763  SCOPED_TSAN_INTERCEPTOR(munmap, addr, sz);
764  DontNeedShadowFor((uptr)addr, sz);
765  int res = REAL(munmap)(addr, sz);
766  return res;
767}
768
769TSAN_INTERCEPTOR(void*, memalign, uptr align, uptr sz) {
770  SCOPED_INTERCEPTOR_RAW(memalign, align, sz);
771  return user_alloc(thr, pc, sz, align);
772}
773
774TSAN_INTERCEPTOR(void*, valloc, uptr sz) {
775  SCOPED_INTERCEPTOR_RAW(valloc, sz);
776  return user_alloc(thr, pc, sz, GetPageSizeCached());
777}
778
779TSAN_INTERCEPTOR(void*, pvalloc, uptr sz) {
780  SCOPED_INTERCEPTOR_RAW(pvalloc, sz);
781  sz = RoundUp(sz, GetPageSizeCached());
782  return user_alloc(thr, pc, sz, GetPageSizeCached());
783}
784
785TSAN_INTERCEPTOR(int, posix_memalign, void **memptr, uptr align, uptr sz) {
786  SCOPED_INTERCEPTOR_RAW(posix_memalign, memptr, align, sz);
787  *memptr = user_alloc(thr, pc, sz, align);
788  return 0;
789}
790
791// Used in thread-safe function static initialization.
792extern "C" int INTERFACE_ATTRIBUTE __cxa_guard_acquire(atomic_uint32_t *g) {
793  SCOPED_INTERCEPTOR_RAW(__cxa_guard_acquire, g);
794  for (;;) {
795    u32 cmp = atomic_load(g, memory_order_acquire);
796    if (cmp == 0) {
797      if (atomic_compare_exchange_strong(g, &cmp, 1<<16, memory_order_relaxed))
798        return 1;
799    } else if (cmp == 1) {
800      Acquire(thr, pc, (uptr)g);
801      return 0;
802    } else {
803      internal_sched_yield();
804    }
805  }
806}
807
808extern "C" void INTERFACE_ATTRIBUTE __cxa_guard_release(atomic_uint32_t *g) {
809  SCOPED_INTERCEPTOR_RAW(__cxa_guard_release, g);
810  Release(thr, pc, (uptr)g);
811  atomic_store(g, 1, memory_order_release);
812}
813
814extern "C" void INTERFACE_ATTRIBUTE __cxa_guard_abort(atomic_uint32_t *g) {
815  SCOPED_INTERCEPTOR_RAW(__cxa_guard_abort, g);
816  atomic_store(g, 0, memory_order_relaxed);
817}
818
819static void thread_finalize(void *v) {
820  uptr iter = (uptr)v;
821  if (iter > 1) {
822    if (pthread_setspecific(g_thread_finalize_key, (void*)(iter - 1))) {
823      Printf("ThreadSanitizer: failed to set thread key\n");
824      Die();
825    }
826    return;
827  }
828  {
829    ScopedInRtl in_rtl;
830    ThreadState *thr = cur_thread();
831    ThreadFinish(thr);
832    SignalContext *sctx = thr->signal_ctx;
833    if (sctx) {
834      thr->signal_ctx = 0;
835      UnmapOrDie(sctx, sizeof(*sctx));
836    }
837  }
838}
839
840
841struct ThreadParam {
842  void* (*callback)(void *arg);
843  void *param;
844  atomic_uintptr_t tid;
845};
846
847extern "C" void *__tsan_thread_start_func(void *arg) {
848  ThreadParam *p = (ThreadParam*)arg;
849  void* (*callback)(void *arg) = p->callback;
850  void *param = p->param;
851  int tid = 0;
852  {
853    ThreadState *thr = cur_thread();
854    ScopedInRtl in_rtl;
855    if (pthread_setspecific(g_thread_finalize_key,
856                            (void *)kPthreadDestructorIterations)) {
857      Printf("ThreadSanitizer: failed to set thread key\n");
858      Die();
859    }
860    while ((tid = atomic_load(&p->tid, memory_order_acquire)) == 0)
861      pthread_yield();
862    atomic_store(&p->tid, 0, memory_order_release);
863    ThreadStart(thr, tid, GetTid());
864    CHECK_EQ(thr->in_rtl, 1);
865  }
866  void *res = callback(param);
867  // Prevent the callback from being tail called,
868  // it mixes up stack traces.
869  volatile int foo = 42;
870  foo++;
871  return res;
872}
873
874TSAN_INTERCEPTOR(int, pthread_create,
875    void *th, void *attr, void *(*callback)(void*), void * param) {
876  SCOPED_INTERCEPTOR_RAW(pthread_create, th, attr, callback, param);
877  __sanitizer_pthread_attr_t myattr;
878  if (attr == 0) {
879    pthread_attr_init(&myattr);
880    attr = &myattr;
881  }
882  int detached = 0;
883  REAL(pthread_attr_getdetachstate)(attr, &detached);
884  AdjustStackSizeLinux(attr);
885
886  ThreadParam p;
887  p.callback = callback;
888  p.param = param;
889  atomic_store(&p.tid, 0, memory_order_relaxed);
890  int res = REAL(pthread_create)(th, attr, __tsan_thread_start_func, &p);
891  if (res == 0) {
892    int tid = ThreadCreate(thr, pc, *(uptr*)th, detached);
893    CHECK_NE(tid, 0);
894    atomic_store(&p.tid, tid, memory_order_release);
895    while (atomic_load(&p.tid, memory_order_acquire) != 0)
896      pthread_yield();
897  }
898  if (attr == &myattr)
899    pthread_attr_destroy(&myattr);
900  return res;
901}
902
903TSAN_INTERCEPTOR(int, pthread_join, void *th, void **ret) {
904  SCOPED_INTERCEPTOR_RAW(pthread_join, th, ret);
905  int tid = ThreadTid(thr, pc, (uptr)th);
906  int res = BLOCK_REAL(pthread_join)(th, ret);
907  if (res == 0) {
908    ThreadJoin(thr, pc, tid);
909  }
910  return res;
911}
912
913TSAN_INTERCEPTOR(int, pthread_detach, void *th) {
914  SCOPED_TSAN_INTERCEPTOR(pthread_detach, th);
915  int tid = ThreadTid(thr, pc, (uptr)th);
916  int res = REAL(pthread_detach)(th);
917  if (res == 0) {
918    ThreadDetach(thr, pc, tid);
919  }
920  return res;
921}
922
923TSAN_INTERCEPTOR(int, pthread_mutex_init, void *m, void *a) {
924  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_init, m, a);
925  int res = REAL(pthread_mutex_init)(m, a);
926  if (res == 0) {
927    bool recursive = false;
928    if (a) {
929      int type = 0;
930      if (pthread_mutexattr_gettype(a, &type) == 0)
931        recursive = (type == PTHREAD_MUTEX_RECURSIVE
932            || type == PTHREAD_MUTEX_RECURSIVE_NP);
933    }
934    MutexCreate(thr, pc, (uptr)m, false, recursive, false);
935  }
936  return res;
937}
938
939TSAN_INTERCEPTOR(int, pthread_mutex_destroy, void *m) {
940  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_destroy, m);
941  int res = REAL(pthread_mutex_destroy)(m);
942  if (res == 0 || res == EBUSY) {
943    MutexDestroy(thr, pc, (uptr)m);
944  }
945  return res;
946}
947
948TSAN_INTERCEPTOR(int, pthread_mutex_trylock, void *m) {
949  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_trylock, m);
950  int res = REAL(pthread_mutex_trylock)(m);
951  if (res == 0) {
952    MutexLock(thr, pc, (uptr)m);
953  }
954  return res;
955}
956
957TSAN_INTERCEPTOR(int, pthread_mutex_timedlock, void *m, void *abstime) {
958  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_timedlock, m, abstime);
959  int res = REAL(pthread_mutex_timedlock)(m, abstime);
960  if (res == 0) {
961    MutexLock(thr, pc, (uptr)m);
962  }
963  return res;
964}
965
966TSAN_INTERCEPTOR(int, pthread_spin_init, void *m, int pshared) {
967  SCOPED_TSAN_INTERCEPTOR(pthread_spin_init, m, pshared);
968  int res = REAL(pthread_spin_init)(m, pshared);
969  if (res == 0) {
970    MutexCreate(thr, pc, (uptr)m, false, false, false);
971  }
972  return res;
973}
974
975TSAN_INTERCEPTOR(int, pthread_spin_destroy, void *m) {
976  SCOPED_TSAN_INTERCEPTOR(pthread_spin_destroy, m);
977  int res = REAL(pthread_spin_destroy)(m);
978  if (res == 0) {
979    MutexDestroy(thr, pc, (uptr)m);
980  }
981  return res;
982}
983
984TSAN_INTERCEPTOR(int, pthread_spin_lock, void *m) {
985  SCOPED_TSAN_INTERCEPTOR(pthread_spin_lock, m);
986  int res = REAL(pthread_spin_lock)(m);
987  if (res == 0) {
988    MutexLock(thr, pc, (uptr)m);
989  }
990  return res;
991}
992
993TSAN_INTERCEPTOR(int, pthread_spin_trylock, void *m) {
994  SCOPED_TSAN_INTERCEPTOR(pthread_spin_trylock, m);
995  int res = REAL(pthread_spin_trylock)(m);
996  if (res == 0) {
997    MutexLock(thr, pc, (uptr)m);
998  }
999  return res;
1000}
1001
1002TSAN_INTERCEPTOR(int, pthread_spin_unlock, void *m) {
1003  SCOPED_TSAN_INTERCEPTOR(pthread_spin_unlock, m);
1004  MutexUnlock(thr, pc, (uptr)m);
1005  int res = REAL(pthread_spin_unlock)(m);
1006  return res;
1007}
1008
1009TSAN_INTERCEPTOR(int, pthread_rwlock_init, void *m, void *a) {
1010  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_init, m, a);
1011  int res = REAL(pthread_rwlock_init)(m, a);
1012  if (res == 0) {
1013    MutexCreate(thr, pc, (uptr)m, true, false, false);
1014  }
1015  return res;
1016}
1017
1018TSAN_INTERCEPTOR(int, pthread_rwlock_destroy, void *m) {
1019  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_destroy, m);
1020  int res = REAL(pthread_rwlock_destroy)(m);
1021  if (res == 0) {
1022    MutexDestroy(thr, pc, (uptr)m);
1023  }
1024  return res;
1025}
1026
1027TSAN_INTERCEPTOR(int, pthread_rwlock_rdlock, void *m) {
1028  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_rdlock, m);
1029  int res = REAL(pthread_rwlock_rdlock)(m);
1030  if (res == 0) {
1031    MutexReadLock(thr, pc, (uptr)m);
1032  }
1033  return res;
1034}
1035
1036TSAN_INTERCEPTOR(int, pthread_rwlock_tryrdlock, void *m) {
1037  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_tryrdlock, m);
1038  int res = REAL(pthread_rwlock_tryrdlock)(m);
1039  if (res == 0) {
1040    MutexReadLock(thr, pc, (uptr)m);
1041  }
1042  return res;
1043}
1044
1045TSAN_INTERCEPTOR(int, pthread_rwlock_timedrdlock, void *m, void *abstime) {
1046  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedrdlock, m, abstime);
1047  int res = REAL(pthread_rwlock_timedrdlock)(m, abstime);
1048  if (res == 0) {
1049    MutexReadLock(thr, pc, (uptr)m);
1050  }
1051  return res;
1052}
1053
1054TSAN_INTERCEPTOR(int, pthread_rwlock_wrlock, void *m) {
1055  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_wrlock, m);
1056  int res = REAL(pthread_rwlock_wrlock)(m);
1057  if (res == 0) {
1058    MutexLock(thr, pc, (uptr)m);
1059  }
1060  return res;
1061}
1062
1063TSAN_INTERCEPTOR(int, pthread_rwlock_trywrlock, void *m) {
1064  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_trywrlock, m);
1065  int res = REAL(pthread_rwlock_trywrlock)(m);
1066  if (res == 0) {
1067    MutexLock(thr, pc, (uptr)m);
1068  }
1069  return res;
1070}
1071
1072TSAN_INTERCEPTOR(int, pthread_rwlock_timedwrlock, void *m, void *abstime) {
1073  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedwrlock, m, abstime);
1074  int res = REAL(pthread_rwlock_timedwrlock)(m, abstime);
1075  if (res == 0) {
1076    MutexLock(thr, pc, (uptr)m);
1077  }
1078  return res;
1079}
1080
1081TSAN_INTERCEPTOR(int, pthread_rwlock_unlock, void *m) {
1082  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_unlock, m);
1083  MutexReadOrWriteUnlock(thr, pc, (uptr)m);
1084  int res = REAL(pthread_rwlock_unlock)(m);
1085  return res;
1086}
1087
1088TSAN_INTERCEPTOR(int, pthread_cond_destroy, void *c) {
1089  SCOPED_TSAN_INTERCEPTOR(pthread_cond_destroy, c);
1090  MemoryWrite(thr, pc, (uptr)c, kSizeLog1);
1091  int res = REAL(pthread_cond_destroy)(c);
1092  return res;
1093}
1094
1095TSAN_INTERCEPTOR(int, pthread_cond_timedwait, void *c, void *m,
1096    void *abstime) {
1097  SCOPED_TSAN_INTERCEPTOR(pthread_cond_timedwait, c, m, abstime);
1098  MutexUnlock(thr, pc, (uptr)m);
1099  MemoryRead(thr, pc, (uptr)c, kSizeLog1);
1100  int res = REAL(pthread_cond_timedwait)(c, m, abstime);
1101  MutexLock(thr, pc, (uptr)m);
1102  return res;
1103}
1104
1105TSAN_INTERCEPTOR(int, pthread_barrier_init, void *b, void *a, unsigned count) {
1106  SCOPED_TSAN_INTERCEPTOR(pthread_barrier_init, b, a, count);
1107  MemoryWrite(thr, pc, (uptr)b, kSizeLog1);
1108  int res = REAL(pthread_barrier_init)(b, a, count);
1109  return res;
1110}
1111
1112TSAN_INTERCEPTOR(int, pthread_barrier_destroy, void *b) {
1113  SCOPED_TSAN_INTERCEPTOR(pthread_barrier_destroy, b);
1114  MemoryWrite(thr, pc, (uptr)b, kSizeLog1);
1115  int res = REAL(pthread_barrier_destroy)(b);
1116  return res;
1117}
1118
1119TSAN_INTERCEPTOR(int, pthread_barrier_wait, void *b) {
1120  SCOPED_TSAN_INTERCEPTOR(pthread_barrier_wait, b);
1121  Release(thr, pc, (uptr)b);
1122  MemoryRead(thr, pc, (uptr)b, kSizeLog1);
1123  int res = REAL(pthread_barrier_wait)(b);
1124  MemoryRead(thr, pc, (uptr)b, kSizeLog1);
1125  if (res == 0 || res == PTHREAD_BARRIER_SERIAL_THREAD) {
1126    Acquire(thr, pc, (uptr)b);
1127  }
1128  return res;
1129}
1130
1131TSAN_INTERCEPTOR(int, pthread_once, void *o, void (*f)()) {
1132  SCOPED_INTERCEPTOR_RAW(pthread_once, o, f);
1133  // Using SCOPED_INTERCEPTOR_RAW, because if we are called from an ignored lib,
1134  // the user callback must be executed with thr->in_rtl == 0.
1135  if (o == 0 || f == 0)
1136    return EINVAL;
1137  atomic_uint32_t *a = static_cast<atomic_uint32_t*>(o);
1138  u32 v = atomic_load(a, memory_order_acquire);
1139  if (v == 0 && atomic_compare_exchange_strong(a, &v, 1,
1140                                               memory_order_relaxed)) {
1141    const int old_in_rtl = thr->in_rtl;
1142    thr->in_rtl = 0;
1143    (*f)();
1144    CHECK_EQ(thr->in_rtl, 0);
1145    thr->in_rtl = old_in_rtl;
1146    if (!thr->in_ignored_lib)
1147      Release(thr, pc, (uptr)o);
1148    atomic_store(a, 2, memory_order_release);
1149  } else {
1150    while (v != 2) {
1151      pthread_yield();
1152      v = atomic_load(a, memory_order_acquire);
1153    }
1154    if (!thr->in_ignored_lib)
1155      Acquire(thr, pc, (uptr)o);
1156  }
1157  return 0;
1158}
1159
1160TSAN_INTERCEPTOR(int, sem_init, void *s, int pshared, unsigned value) {
1161  SCOPED_TSAN_INTERCEPTOR(sem_init, s, pshared, value);
1162  int res = REAL(sem_init)(s, pshared, value);
1163  return res;
1164}
1165
1166TSAN_INTERCEPTOR(int, sem_destroy, void *s) {
1167  SCOPED_TSAN_INTERCEPTOR(sem_destroy, s);
1168  int res = REAL(sem_destroy)(s);
1169  return res;
1170}
1171
1172TSAN_INTERCEPTOR(int, sem_wait, void *s) {
1173  SCOPED_TSAN_INTERCEPTOR(sem_wait, s);
1174  int res = BLOCK_REAL(sem_wait)(s);
1175  if (res == 0) {
1176    Acquire(thr, pc, (uptr)s);
1177  }
1178  return res;
1179}
1180
1181TSAN_INTERCEPTOR(int, sem_trywait, void *s) {
1182  SCOPED_TSAN_INTERCEPTOR(sem_trywait, s);
1183  int res = BLOCK_REAL(sem_trywait)(s);
1184  if (res == 0) {
1185    Acquire(thr, pc, (uptr)s);
1186  }
1187  return res;
1188}
1189
1190TSAN_INTERCEPTOR(int, sem_timedwait, void *s, void *abstime) {
1191  SCOPED_TSAN_INTERCEPTOR(sem_timedwait, s, abstime);
1192  int res = BLOCK_REAL(sem_timedwait)(s, abstime);
1193  if (res == 0) {
1194    Acquire(thr, pc, (uptr)s);
1195  }
1196  return res;
1197}
1198
1199TSAN_INTERCEPTOR(int, sem_post, void *s) {
1200  SCOPED_TSAN_INTERCEPTOR(sem_post, s);
1201  Release(thr, pc, (uptr)s);
1202  int res = REAL(sem_post)(s);
1203  return res;
1204}
1205
1206TSAN_INTERCEPTOR(int, sem_getvalue, void *s, int *sval) {
1207  SCOPED_TSAN_INTERCEPTOR(sem_getvalue, s, sval);
1208  int res = REAL(sem_getvalue)(s, sval);
1209  if (res == 0) {
1210    Acquire(thr, pc, (uptr)s);
1211  }
1212  return res;
1213}
1214
1215TSAN_INTERCEPTOR(int, __xstat, int version, const char *path, void *buf) {
1216  SCOPED_TSAN_INTERCEPTOR(__xstat, version, path, buf);
1217  return REAL(__xstat)(version, path, buf);
1218}
1219
1220TSAN_INTERCEPTOR(int, stat, const char *path, void *buf) {
1221  SCOPED_TSAN_INTERCEPTOR(__xstat, 0, path, buf);
1222  return REAL(__xstat)(0, path, buf);
1223}
1224
1225TSAN_INTERCEPTOR(int, __xstat64, int version, const char *path, void *buf) {
1226  SCOPED_TSAN_INTERCEPTOR(__xstat64, version, path, buf);
1227  return REAL(__xstat64)(version, path, buf);
1228}
1229
1230TSAN_INTERCEPTOR(int, stat64, const char *path, void *buf) {
1231  SCOPED_TSAN_INTERCEPTOR(__xstat64, 0, path, buf);
1232  return REAL(__xstat64)(0, path, buf);
1233}
1234
1235TSAN_INTERCEPTOR(int, __lxstat, int version, const char *path, void *buf) {
1236  SCOPED_TSAN_INTERCEPTOR(__lxstat, version, path, buf);
1237  return REAL(__lxstat)(version, path, buf);
1238}
1239
1240TSAN_INTERCEPTOR(int, lstat, const char *path, void *buf) {
1241  SCOPED_TSAN_INTERCEPTOR(__lxstat, 0, path, buf);
1242  return REAL(__lxstat)(0, path, buf);
1243}
1244
1245TSAN_INTERCEPTOR(int, __lxstat64, int version, const char *path, void *buf) {
1246  SCOPED_TSAN_INTERCEPTOR(__lxstat64, version, path, buf);
1247  return REAL(__lxstat64)(version, path, buf);
1248}
1249
1250TSAN_INTERCEPTOR(int, lstat64, const char *path, void *buf) {
1251  SCOPED_TSAN_INTERCEPTOR(__lxstat64, 0, path, buf);
1252  return REAL(__lxstat64)(0, path, buf);
1253}
1254
1255TSAN_INTERCEPTOR(int, __fxstat, int version, int fd, void *buf) {
1256  SCOPED_TSAN_INTERCEPTOR(__fxstat, version, fd, buf);
1257  if (fd > 0)
1258    FdAccess(thr, pc, fd);
1259  return REAL(__fxstat)(version, fd, buf);
1260}
1261
1262TSAN_INTERCEPTOR(int, fstat, int fd, void *buf) {
1263  SCOPED_TSAN_INTERCEPTOR(__fxstat, 0, fd, buf);
1264  if (fd > 0)
1265    FdAccess(thr, pc, fd);
1266  return REAL(__fxstat)(0, fd, buf);
1267}
1268
1269TSAN_INTERCEPTOR(int, __fxstat64, int version, int fd, void *buf) {
1270  SCOPED_TSAN_INTERCEPTOR(__fxstat64, version, fd, buf);
1271  if (fd > 0)
1272    FdAccess(thr, pc, fd);
1273  return REAL(__fxstat64)(version, fd, buf);
1274}
1275
1276TSAN_INTERCEPTOR(int, fstat64, int fd, void *buf) {
1277  SCOPED_TSAN_INTERCEPTOR(__fxstat64, 0, fd, buf);
1278  if (fd > 0)
1279    FdAccess(thr, pc, fd);
1280  return REAL(__fxstat64)(0, fd, buf);
1281}
1282
1283TSAN_INTERCEPTOR(int, open, const char *name, int flags, int mode) {
1284  SCOPED_TSAN_INTERCEPTOR(open, name, flags, mode);
1285  int fd = REAL(open)(name, flags, mode);
1286  if (fd >= 0)
1287    FdFileCreate(thr, pc, fd);
1288  return fd;
1289}
1290
1291TSAN_INTERCEPTOR(int, open64, const char *name, int flags, int mode) {
1292  SCOPED_TSAN_INTERCEPTOR(open64, name, flags, mode);
1293  int fd = REAL(open64)(name, flags, mode);
1294  if (fd >= 0)
1295    FdFileCreate(thr, pc, fd);
1296  return fd;
1297}
1298
1299TSAN_INTERCEPTOR(int, creat, const char *name, int mode) {
1300  SCOPED_TSAN_INTERCEPTOR(creat, name, mode);
1301  int fd = REAL(creat)(name, mode);
1302  if (fd >= 0)
1303    FdFileCreate(thr, pc, fd);
1304  return fd;
1305}
1306
1307TSAN_INTERCEPTOR(int, creat64, const char *name, int mode) {
1308  SCOPED_TSAN_INTERCEPTOR(creat64, name, mode);
1309  int fd = REAL(creat64)(name, mode);
1310  if (fd >= 0)
1311    FdFileCreate(thr, pc, fd);
1312  return fd;
1313}
1314
1315TSAN_INTERCEPTOR(int, dup, int oldfd) {
1316  SCOPED_TSAN_INTERCEPTOR(dup, oldfd);
1317  int newfd = REAL(dup)(oldfd);
1318  if (oldfd >= 0 && newfd >= 0 && newfd != oldfd)
1319    FdDup(thr, pc, oldfd, newfd);
1320  return newfd;
1321}
1322
1323TSAN_INTERCEPTOR(int, dup2, int oldfd, int newfd) {
1324  SCOPED_TSAN_INTERCEPTOR(dup2, oldfd, newfd);
1325  int newfd2 = REAL(dup2)(oldfd, newfd);
1326  if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
1327    FdDup(thr, pc, oldfd, newfd2);
1328  return newfd2;
1329}
1330
1331TSAN_INTERCEPTOR(int, dup3, int oldfd, int newfd, int flags) {
1332  SCOPED_TSAN_INTERCEPTOR(dup3, oldfd, newfd, flags);
1333  int newfd2 = REAL(dup3)(oldfd, newfd, flags);
1334  if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
1335    FdDup(thr, pc, oldfd, newfd2);
1336  return newfd2;
1337}
1338
1339TSAN_INTERCEPTOR(int, eventfd, unsigned initval, int flags) {
1340  SCOPED_TSAN_INTERCEPTOR(eventfd, initval, flags);
1341  int fd = REAL(eventfd)(initval, flags);
1342  if (fd >= 0)
1343    FdEventCreate(thr, pc, fd);
1344  return fd;
1345}
1346
1347TSAN_INTERCEPTOR(int, signalfd, int fd, void *mask, int flags) {
1348  SCOPED_TSAN_INTERCEPTOR(signalfd, fd, mask, flags);
1349  if (fd >= 0)
1350    FdClose(thr, pc, fd);
1351  fd = REAL(signalfd)(fd, mask, flags);
1352  if (fd >= 0)
1353    FdSignalCreate(thr, pc, fd);
1354  return fd;
1355}
1356
1357TSAN_INTERCEPTOR(int, inotify_init, int fake) {
1358  SCOPED_TSAN_INTERCEPTOR(inotify_init, fake);
1359  int fd = REAL(inotify_init)(fake);
1360  if (fd >= 0)
1361    FdInotifyCreate(thr, pc, fd);
1362  return fd;
1363}
1364
1365TSAN_INTERCEPTOR(int, inotify_init1, int flags) {
1366  SCOPED_TSAN_INTERCEPTOR(inotify_init1, flags);
1367  int fd = REAL(inotify_init1)(flags);
1368  if (fd >= 0)
1369    FdInotifyCreate(thr, pc, fd);
1370  return fd;
1371}
1372
1373TSAN_INTERCEPTOR(int, socket, int domain, int type, int protocol) {
1374  SCOPED_TSAN_INTERCEPTOR(socket, domain, type, protocol);
1375  int fd = REAL(socket)(domain, type, protocol);
1376  if (fd >= 0)
1377    FdSocketCreate(thr, pc, fd);
1378  return fd;
1379}
1380
1381TSAN_INTERCEPTOR(int, socketpair, int domain, int type, int protocol, int *fd) {
1382  SCOPED_TSAN_INTERCEPTOR(socketpair, domain, type, protocol, fd);
1383  int res = REAL(socketpair)(domain, type, protocol, fd);
1384  if (res == 0 && fd[0] >= 0 && fd[1] >= 0)
1385    FdPipeCreate(thr, pc, fd[0], fd[1]);
1386  return res;
1387}
1388
1389TSAN_INTERCEPTOR(int, connect, int fd, void *addr, unsigned addrlen) {
1390  SCOPED_TSAN_INTERCEPTOR(connect, fd, addr, addrlen);
1391  FdSocketConnecting(thr, pc, fd);
1392  int res = REAL(connect)(fd, addr, addrlen);
1393  if (res == 0 && fd >= 0)
1394    FdSocketConnect(thr, pc, fd);
1395  return res;
1396}
1397
1398TSAN_INTERCEPTOR(int, bind, int fd, void *addr, unsigned addrlen) {
1399  SCOPED_TSAN_INTERCEPTOR(bind, fd, addr, addrlen);
1400  int res = REAL(bind)(fd, addr, addrlen);
1401  if (fd > 0 && res == 0)
1402    FdAccess(thr, pc, fd);
1403  return res;
1404}
1405
1406TSAN_INTERCEPTOR(int, listen, int fd, int backlog) {
1407  SCOPED_TSAN_INTERCEPTOR(listen, fd, backlog);
1408  int res = REAL(listen)(fd, backlog);
1409  if (fd > 0 && res == 0)
1410    FdAccess(thr, pc, fd);
1411  return res;
1412}
1413
1414TSAN_INTERCEPTOR(int, epoll_create, int size) {
1415  SCOPED_TSAN_INTERCEPTOR(epoll_create, size);
1416  int fd = REAL(epoll_create)(size);
1417  if (fd >= 0)
1418    FdPollCreate(thr, pc, fd);
1419  return fd;
1420}
1421
1422TSAN_INTERCEPTOR(int, epoll_create1, int flags) {
1423  SCOPED_TSAN_INTERCEPTOR(epoll_create1, flags);
1424  int fd = REAL(epoll_create1)(flags);
1425  if (fd >= 0)
1426    FdPollCreate(thr, pc, fd);
1427  return fd;
1428}
1429
1430TSAN_INTERCEPTOR(int, close, int fd) {
1431  SCOPED_TSAN_INTERCEPTOR(close, fd);
1432  if (fd >= 0)
1433    FdClose(thr, pc, fd);
1434  return REAL(close)(fd);
1435}
1436
1437TSAN_INTERCEPTOR(int, __close, int fd) {
1438  SCOPED_TSAN_INTERCEPTOR(__close, fd);
1439  if (fd >= 0)
1440    FdClose(thr, pc, fd);
1441  return REAL(__close)(fd);
1442}
1443
1444// glibc guts
1445TSAN_INTERCEPTOR(void, __res_iclose, void *state, bool free_addr) {
1446  SCOPED_TSAN_INTERCEPTOR(__res_iclose, state, free_addr);
1447  int fds[64];
1448  int cnt = ExtractResolvFDs(state, fds, ARRAY_SIZE(fds));
1449  for (int i = 0; i < cnt; i++) {
1450    if (fds[i] > 0)
1451      FdClose(thr, pc, fds[i]);
1452  }
1453  REAL(__res_iclose)(state, free_addr);
1454}
1455
1456TSAN_INTERCEPTOR(int, pipe, int *pipefd) {
1457  SCOPED_TSAN_INTERCEPTOR(pipe, pipefd);
1458  int res = REAL(pipe)(pipefd);
1459  if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
1460    FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
1461  return res;
1462}
1463
1464TSAN_INTERCEPTOR(int, pipe2, int *pipefd, int flags) {
1465  SCOPED_TSAN_INTERCEPTOR(pipe2, pipefd, flags);
1466  int res = REAL(pipe2)(pipefd, flags);
1467  if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
1468    FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
1469  return res;
1470}
1471
1472TSAN_INTERCEPTOR(long_t, send, int fd, void *buf, long_t len, int flags) {
1473  SCOPED_TSAN_INTERCEPTOR(send, fd, buf, len, flags);
1474  if (fd >= 0) {
1475    FdAccess(thr, pc, fd);
1476    FdRelease(thr, pc, fd);
1477  }
1478  int res = REAL(send)(fd, buf, len, flags);
1479  return res;
1480}
1481
1482TSAN_INTERCEPTOR(long_t, sendmsg, int fd, void *msg, int flags) {
1483  SCOPED_TSAN_INTERCEPTOR(sendmsg, fd, msg, flags);
1484  if (fd >= 0) {
1485    FdAccess(thr, pc, fd);
1486    FdRelease(thr, pc, fd);
1487  }
1488  int res = REAL(sendmsg)(fd, msg, flags);
1489  return res;
1490}
1491
1492TSAN_INTERCEPTOR(long_t, recv, int fd, void *buf, long_t len, int flags) {
1493  SCOPED_TSAN_INTERCEPTOR(recv, fd, buf, len, flags);
1494  if (fd >= 0)
1495    FdAccess(thr, pc, fd);
1496  int res = REAL(recv)(fd, buf, len, flags);
1497  if (res >= 0 && fd >= 0) {
1498    FdAcquire(thr, pc, fd);
1499  }
1500  return res;
1501}
1502
1503TSAN_INTERCEPTOR(int, unlink, char *path) {
1504  SCOPED_TSAN_INTERCEPTOR(unlink, path);
1505  Release(thr, pc, File2addr(path));
1506  int res = REAL(unlink)(path);
1507  return res;
1508}
1509
1510TSAN_INTERCEPTOR(void*, fopen, char *path, char *mode) {
1511  SCOPED_TSAN_INTERCEPTOR(fopen, path, mode);
1512  void *res = REAL(fopen)(path, mode);
1513  Acquire(thr, pc, File2addr(path));
1514  if (res) {
1515    int fd = fileno_unlocked(res);
1516    if (fd >= 0)
1517      FdFileCreate(thr, pc, fd);
1518  }
1519  return res;
1520}
1521
1522TSAN_INTERCEPTOR(void*, freopen, char *path, char *mode, void *stream) {
1523  SCOPED_TSAN_INTERCEPTOR(freopen, path, mode, stream);
1524  if (stream) {
1525    int fd = fileno_unlocked(stream);
1526    if (fd >= 0)
1527      FdClose(thr, pc, fd);
1528  }
1529  void *res = REAL(freopen)(path, mode, stream);
1530  Acquire(thr, pc, File2addr(path));
1531  if (res) {
1532    int fd = fileno_unlocked(res);
1533    if (fd >= 0)
1534      FdFileCreate(thr, pc, fd);
1535  }
1536  return res;
1537}
1538
1539TSAN_INTERCEPTOR(int, fclose, void *stream) {
1540  {
1541    SCOPED_TSAN_INTERCEPTOR(fclose, stream);
1542    if (stream) {
1543      int fd = fileno_unlocked(stream);
1544      if (fd >= 0)
1545        FdClose(thr, pc, fd);
1546    }
1547  }
1548  return REAL(fclose)(stream);
1549}
1550
1551TSAN_INTERCEPTOR(uptr, fread, void *ptr, uptr size, uptr nmemb, void *f) {
1552  {
1553    SCOPED_TSAN_INTERCEPTOR(fread, ptr, size, nmemb, f);
1554    MemoryAccessRange(thr, pc, (uptr)ptr, size * nmemb, true);
1555  }
1556  return REAL(fread)(ptr, size, nmemb, f);
1557}
1558
1559TSAN_INTERCEPTOR(uptr, fwrite, const void *p, uptr size, uptr nmemb, void *f) {
1560  {
1561    SCOPED_TSAN_INTERCEPTOR(fwrite, p, size, nmemb, f);
1562    MemoryAccessRange(thr, pc, (uptr)p, size * nmemb, false);
1563  }
1564  return REAL(fwrite)(p, size, nmemb, f);
1565}
1566
1567TSAN_INTERCEPTOR(int, fflush, void *stream) {
1568  SCOPED_TSAN_INTERCEPTOR(fflush, stream);
1569  return REAL(fflush)(stream);
1570}
1571
1572TSAN_INTERCEPTOR(void, abort, int fake) {
1573  SCOPED_TSAN_INTERCEPTOR(abort, fake);
1574  REAL(fflush)(0);
1575  REAL(abort)(fake);
1576}
1577
1578TSAN_INTERCEPTOR(int, puts, const char *s) {
1579  SCOPED_TSAN_INTERCEPTOR(puts, s);
1580  MemoryAccessRange(thr, pc, (uptr)s, internal_strlen(s), false);
1581  return REAL(puts)(s);
1582}
1583
1584TSAN_INTERCEPTOR(int, rmdir, char *path) {
1585  SCOPED_TSAN_INTERCEPTOR(rmdir, path);
1586  Release(thr, pc, Dir2addr(path));
1587  int res = REAL(rmdir)(path);
1588  return res;
1589}
1590
1591TSAN_INTERCEPTOR(void*, opendir, char *path) {
1592  SCOPED_TSAN_INTERCEPTOR(opendir, path);
1593  void *res = REAL(opendir)(path);
1594  if (res != 0)
1595    Acquire(thr, pc, Dir2addr(path));
1596  return res;
1597}
1598
1599TSAN_INTERCEPTOR(int, epoll_ctl, int epfd, int op, int fd, void *ev) {
1600  SCOPED_TSAN_INTERCEPTOR(epoll_ctl, epfd, op, fd, ev);
1601  if (epfd >= 0)
1602    FdAccess(thr, pc, epfd);
1603  if (epfd >= 0 && fd >= 0)
1604    FdAccess(thr, pc, fd);
1605  if (op == EPOLL_CTL_ADD && epfd >= 0)
1606    FdRelease(thr, pc, epfd);
1607  int res = REAL(epoll_ctl)(epfd, op, fd, ev);
1608  return res;
1609}
1610
1611TSAN_INTERCEPTOR(int, epoll_wait, int epfd, void *ev, int cnt, int timeout) {
1612  SCOPED_TSAN_INTERCEPTOR(epoll_wait, epfd, ev, cnt, timeout);
1613  if (epfd >= 0)
1614    FdAccess(thr, pc, epfd);
1615  int res = BLOCK_REAL(epoll_wait)(epfd, ev, cnt, timeout);
1616  if (res > 0 && epfd >= 0)
1617    FdAcquire(thr, pc, epfd);
1618  return res;
1619}
1620
1621void ALWAYS_INLINE rtl_generic_sighandler(bool sigact, int sig,
1622    my_siginfo_t *info, void *ctx) {
1623  ThreadState *thr = cur_thread();
1624  SignalContext *sctx = SigCtx(thr);
1625  // Don't mess with synchronous signals.
1626  if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
1627      sig == SIGABRT || sig == SIGFPE || sig == SIGPIPE || sig == SIGSYS ||
1628      // If we are sending signal to ourselves, we must process it now.
1629      (sctx && sig == sctx->int_signal_send) ||
1630      // If we are in blocking function, we can safely process it now
1631      // (but check if we are in a recursive interceptor,
1632      // i.e. pthread_join()->munmap()).
1633      (sctx && sctx->in_blocking_func == 1 && thr->in_rtl == 1)) {
1634    int in_rtl = thr->in_rtl;
1635    thr->in_rtl = 0;
1636    CHECK_EQ(thr->in_signal_handler, false);
1637    thr->in_signal_handler = true;
1638    if (sigact)
1639      sigactions[sig].sa_sigaction(sig, info, ctx);
1640    else
1641      sigactions[sig].sa_handler(sig);
1642    CHECK_EQ(thr->in_signal_handler, true);
1643    thr->in_signal_handler = false;
1644    thr->in_rtl = in_rtl;
1645    return;
1646  }
1647
1648  if (sctx == 0)
1649    return;
1650  SignalDesc *signal = &sctx->pending_signals[sig];
1651  if (signal->armed == false) {
1652    signal->armed = true;
1653    signal->sigaction = sigact;
1654    if (info)
1655      internal_memcpy(&signal->siginfo, info, sizeof(*info));
1656    if (ctx)
1657      internal_memcpy(&signal->ctx, ctx, sizeof(signal->ctx));
1658    sctx->pending_signal_count++;
1659  }
1660}
1661
1662static void rtl_sighandler(int sig) {
1663  rtl_generic_sighandler(false, sig, 0, 0);
1664}
1665
1666static void rtl_sigaction(int sig, my_siginfo_t *info, void *ctx) {
1667  rtl_generic_sighandler(true, sig, info, ctx);
1668}
1669
1670TSAN_INTERCEPTOR(int, sigaction, int sig, sigaction_t *act, sigaction_t *old) {
1671  SCOPED_TSAN_INTERCEPTOR(sigaction, sig, act, old);
1672  if (old)
1673    internal_memcpy(old, &sigactions[sig], sizeof(*old));
1674  if (act == 0)
1675    return 0;
1676  internal_memcpy(&sigactions[sig], act, sizeof(*act));
1677  sigaction_t newact;
1678  internal_memcpy(&newact, act, sizeof(newact));
1679  REAL(sigfillset)(&newact.sa_mask);
1680  if (act->sa_handler != SIG_IGN && act->sa_handler != SIG_DFL) {
1681    if (newact.sa_flags & SA_SIGINFO)
1682      newact.sa_sigaction = rtl_sigaction;
1683    else
1684      newact.sa_handler = rtl_sighandler;
1685  }
1686  int res = REAL(sigaction)(sig, &newact, 0);
1687  return res;
1688}
1689
1690TSAN_INTERCEPTOR(sighandler_t, signal, int sig, sighandler_t h) {
1691  sigaction_t act;
1692  act.sa_handler = h;
1693  REAL(memset)(&act.sa_mask, -1, sizeof(act.sa_mask));
1694  act.sa_flags = 0;
1695  sigaction_t old;
1696  int res = sigaction(sig, &act, &old);
1697  if (res)
1698    return SIG_ERR;
1699  return old.sa_handler;
1700}
1701
1702TSAN_INTERCEPTOR(int, sigsuspend, const __sanitizer_sigset_t *mask) {
1703  SCOPED_TSAN_INTERCEPTOR(sigsuspend, mask);
1704  return REAL(sigsuspend)(mask);
1705}
1706
1707TSAN_INTERCEPTOR(int, raise, int sig) {
1708  SCOPED_TSAN_INTERCEPTOR(raise, sig);
1709  SignalContext *sctx = SigCtx(thr);
1710  CHECK_NE(sctx, 0);
1711  int prev = sctx->int_signal_send;
1712  sctx->int_signal_send = sig;
1713  int res = REAL(raise)(sig);
1714  CHECK_EQ(sctx->int_signal_send, sig);
1715  sctx->int_signal_send = prev;
1716  return res;
1717}
1718
1719TSAN_INTERCEPTOR(int, kill, int pid, int sig) {
1720  SCOPED_TSAN_INTERCEPTOR(kill, pid, sig);
1721  SignalContext *sctx = SigCtx(thr);
1722  CHECK_NE(sctx, 0);
1723  int prev = sctx->int_signal_send;
1724  if (pid == (int)internal_getpid()) {
1725    sctx->int_signal_send = sig;
1726  }
1727  int res = REAL(kill)(pid, sig);
1728  if (pid == (int)internal_getpid()) {
1729    CHECK_EQ(sctx->int_signal_send, sig);
1730    sctx->int_signal_send = prev;
1731  }
1732  return res;
1733}
1734
1735TSAN_INTERCEPTOR(int, pthread_kill, void *tid, int sig) {
1736  SCOPED_TSAN_INTERCEPTOR(pthread_kill, tid, sig);
1737  SignalContext *sctx = SigCtx(thr);
1738  CHECK_NE(sctx, 0);
1739  int prev = sctx->int_signal_send;
1740  if (tid == pthread_self()) {
1741    sctx->int_signal_send = sig;
1742  }
1743  int res = REAL(pthread_kill)(tid, sig);
1744  if (tid == pthread_self()) {
1745    CHECK_EQ(sctx->int_signal_send, sig);
1746    sctx->int_signal_send = prev;
1747  }
1748  return res;
1749}
1750
1751TSAN_INTERCEPTOR(int, gettimeofday, void *tv, void *tz) {
1752  SCOPED_TSAN_INTERCEPTOR(gettimeofday, tv, tz);
1753  // It's intercepted merely to process pending signals.
1754  return REAL(gettimeofday)(tv, tz);
1755}
1756
1757TSAN_INTERCEPTOR(int, getaddrinfo, void *node, void *service,
1758    void *hints, void *rv) {
1759  SCOPED_TSAN_INTERCEPTOR(getaddrinfo, node, service, hints, rv);
1760  // We miss atomic synchronization in getaddrinfo,
1761  // and can report false race between malloc and free
1762  // inside of getaddrinfo. So ignore memory accesses.
1763  ThreadIgnoreBegin(thr);
1764  // getaddrinfo calls fopen, which can be intercepted by user.
1765  thr->in_rtl--;
1766  CHECK_EQ(thr->in_rtl, 0);
1767  int res = REAL(getaddrinfo)(node, service, hints, rv);
1768  thr->in_rtl++;
1769  ThreadIgnoreEnd(thr);
1770  return res;
1771}
1772
1773// Linux kernel has a bug that leads to kernel deadlock if a process
1774// maps TBs of memory and then calls mlock().
1775static void MlockIsUnsupported() {
1776  static atomic_uint8_t printed;
1777  if (atomic_exchange(&printed, 1, memory_order_relaxed))
1778    return;
1779  if (flags()->verbosity > 0)
1780    Printf("INFO: ThreadSanitizer ignores mlock/mlockall/munlock/munlockall\n");
1781}
1782
1783TSAN_INTERCEPTOR(int, mlock, const void *addr, uptr len) {
1784  MlockIsUnsupported();
1785  return 0;
1786}
1787
1788TSAN_INTERCEPTOR(int, munlock, const void *addr, uptr len) {
1789  MlockIsUnsupported();
1790  return 0;
1791}
1792
1793TSAN_INTERCEPTOR(int, mlockall, int flags) {
1794  MlockIsUnsupported();
1795  return 0;
1796}
1797
1798TSAN_INTERCEPTOR(int, munlockall, void) {
1799  MlockIsUnsupported();
1800  return 0;
1801}
1802
1803TSAN_INTERCEPTOR(int, fork, int fake) {
1804  SCOPED_INTERCEPTOR_RAW(fork, fake);
1805  int pid = REAL(fork)(fake);
1806  if (pid == 0) {
1807    // child
1808    FdOnFork(thr, pc);
1809  } else if (pid > 0) {
1810    // parent
1811  }
1812  return pid;
1813}
1814
1815static int OnExit(ThreadState *thr) {
1816  int status = Finalize(thr);
1817  REAL(fflush)(0);
1818  return status;
1819}
1820
1821struct TsanInterceptorContext {
1822  ThreadState *thr;
1823  const uptr caller_pc;
1824  const uptr pc;
1825};
1826
1827#include "sanitizer_common/sanitizer_platform_interceptors.h"
1828// Causes interceptor recursion (getpwuid_r() calls fopen())
1829#undef SANITIZER_INTERCEPT_GETPWNAM_AND_FRIENDS
1830#undef SANITIZER_INTERCEPT_GETPWNAM_R_AND_FRIENDS
1831// Causes interceptor recursion (getaddrinfo() and fopen())
1832#undef SANITIZER_INTERCEPT_GETADDRINFO
1833#undef SANITIZER_INTERCEPT_GETNAMEINFO
1834// Causes interceptor recursion (glob64() calls lstat64())
1835#undef SANITIZER_INTERCEPT_GLOB
1836
1837#define COMMON_INTERCEPTOR_UNPOISON_PARAM(ctx, count) \
1838  do {                                                \
1839  } while (false)
1840#define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size)                    \
1841  MemoryAccessRange(((TsanInterceptorContext *)ctx)->thr,                 \
1842                    ((TsanInterceptorContext *)ctx)->pc, (uptr)ptr, size, \
1843                    true)
1844#define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size)                       \
1845  MemoryAccessRange(((TsanInterceptorContext *) ctx)->thr,                  \
1846                    ((TsanInterceptorContext *) ctx)->pc, (uptr) ptr, size, \
1847                    false)
1848#define COMMON_INTERCEPTOR_ENTER(ctx, func, ...)      \
1849  SCOPED_TSAN_INTERCEPTOR(func, __VA_ARGS__);         \
1850  TsanInterceptorContext _ctx = {thr, caller_pc, pc}; \
1851  ctx = (void *)&_ctx;                                \
1852  (void) ctx;
1853#define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \
1854  FdAcquire(((TsanInterceptorContext *) ctx)->thr, pc, fd)
1855#define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \
1856  FdRelease(((TsanInterceptorContext *) ctx)->thr, pc, fd)
1857#define COMMON_INTERCEPTOR_FD_ACCESS(ctx, fd) \
1858  FdAccess(((TsanInterceptorContext *) ctx)->thr, pc, fd)
1859#define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd) \
1860  FdSocketAccept(((TsanInterceptorContext *) ctx)->thr, pc, fd, newfd)
1861#define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) \
1862  ThreadSetName(((TsanInterceptorContext *) ctx)->thr, name)
1863#define COMMON_INTERCEPTOR_BLOCK_REAL(name) BLOCK_REAL(name)
1864#define COMMON_INTERCEPTOR_ON_EXIT(ctx) \
1865  OnExit(((TsanInterceptorContext *) ctx)->thr)
1866#define COMMON_INTERCEPTOR_MUTEX_LOCK(ctx, m) \
1867  MutexLock(((TsanInterceptorContext *)ctx)->thr, \
1868            ((TsanInterceptorContext *)ctx)->pc, (uptr)m)
1869#define COMMON_INTERCEPTOR_MUTEX_UNLOCK(ctx, m) \
1870  MutexUnlock(((TsanInterceptorContext *)ctx)->thr, \
1871            ((TsanInterceptorContext *)ctx)->pc, (uptr)m)
1872#include "sanitizer_common/sanitizer_common_interceptors.inc"
1873
1874#define TSAN_SYSCALL() \
1875  ThreadState *thr = cur_thread(); \
1876  ScopedSyscall scoped_syscall(thr) \
1877/**/
1878
1879struct ScopedSyscall {
1880  ThreadState *thr;
1881
1882  explicit ScopedSyscall(ThreadState *thr)
1883      : thr(thr) {
1884    if (thr->in_rtl == 0)
1885      Initialize(thr);
1886    thr->in_rtl++;
1887  }
1888
1889  ~ScopedSyscall() {
1890    thr->in_rtl--;
1891    if (thr->in_rtl == 0)
1892      ProcessPendingSignals(thr);
1893  }
1894};
1895
1896static void syscall_access_range(uptr pc, uptr p, uptr s, bool write) {
1897  TSAN_SYSCALL();
1898  MemoryAccessRange(thr, pc, p, s, write);
1899}
1900
1901static void syscall_fd_close(uptr pc, int fd) {
1902  TSAN_SYSCALL();
1903  if (fd >= 0)
1904    FdClose(thr, pc, fd);
1905}
1906
1907static void syscall_pre_fork(uptr pc) {
1908  TSAN_SYSCALL();
1909}
1910
1911static void syscall_post_fork(uptr pc, int res) {
1912  TSAN_SYSCALL();
1913  if (res == 0) {
1914    // child
1915    FdOnFork(thr, pc);
1916  } else if (res > 0) {
1917    // parent
1918  }
1919}
1920
1921#define COMMON_SYSCALL_PRE_READ_RANGE(p, s) \
1922  syscall_access_range(GET_CALLER_PC(), (uptr)(p), (uptr)(s), false)
1923#define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) \
1924  syscall_access_range(GET_CALLER_PC(), (uptr)(p), (uptr)(s), true)
1925#define COMMON_SYSCALL_POST_READ_RANGE(p, s) \
1926  do { } while (false)
1927#define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) \
1928  do { } while (false)
1929#define COMMON_SYSCALL_FD_CLOSE(fd) \
1930  syscall_fd_close(GET_CALLER_PC(), fd)
1931#define COMMON_SYSCALL_PRE_FORK() \
1932  syscall_pre_fork(GET_CALLER_PC())
1933#define COMMON_SYSCALL_POST_FORK(res) \
1934  syscall_post_fork(GET_CALLER_PC(), res)
1935#include "sanitizer_common/sanitizer_common_syscalls.inc"
1936
1937namespace __tsan {
1938
1939static void finalize(void *arg) {
1940  ThreadState *thr = cur_thread();
1941  uptr pc = 0;
1942  atexit_ctx->exit(thr, pc);
1943  int status = Finalize(thr);
1944  REAL(fflush)(0);
1945  if (status)
1946    REAL(_exit)(status);
1947}
1948
1949void ProcessPendingSignals(ThreadState *thr) {
1950  CHECK_EQ(thr->in_rtl, 0);
1951  SignalContext *sctx = SigCtx(thr);
1952  if (sctx == 0 || sctx->pending_signal_count == 0 || thr->in_signal_handler)
1953    return;
1954  Context *ctx = CTX();
1955  thr->in_signal_handler = true;
1956  sctx->pending_signal_count = 0;
1957  // These are too big for stack.
1958  static THREADLOCAL __sanitizer_sigset_t emptyset, oldset;
1959  REAL(sigfillset)(&emptyset);
1960  pthread_sigmask(SIG_SETMASK, &emptyset, &oldset);
1961  for (int sig = 0; sig < kSigCount; sig++) {
1962    SignalDesc *signal = &sctx->pending_signals[sig];
1963    if (signal->armed) {
1964      signal->armed = false;
1965      if (sigactions[sig].sa_handler != SIG_DFL
1966          && sigactions[sig].sa_handler != SIG_IGN) {
1967        // Insure that the handler does not spoil errno.
1968        const int saved_errno = errno;
1969        errno = 0;
1970        if (signal->sigaction)
1971          sigactions[sig].sa_sigaction(sig, &signal->siginfo, &signal->ctx);
1972        else
1973          sigactions[sig].sa_handler(sig);
1974        if (flags()->report_bugs && errno != 0) {
1975          ScopedInRtl in_rtl;
1976          __tsan::StackTrace stack;
1977          uptr pc = signal->sigaction ?
1978              (uptr)sigactions[sig].sa_sigaction :
1979              (uptr)sigactions[sig].sa_handler;
1980          pc += 1;  // return address is expected, OutputReport() will undo this
1981          stack.Init(&pc, 1);
1982          ThreadRegistryLock l(ctx->thread_registry);
1983          ScopedReport rep(ReportTypeErrnoInSignal);
1984          if (!IsFiredSuppression(ctx, rep, stack)) {
1985            rep.AddStack(&stack);
1986            OutputReport(ctx, rep, rep.GetReport()->stacks[0]);
1987          }
1988        }
1989        errno = saved_errno;
1990      }
1991    }
1992  }
1993  pthread_sigmask(SIG_SETMASK, &oldset, 0);
1994  CHECK_EQ(thr->in_signal_handler, true);
1995  thr->in_signal_handler = false;
1996}
1997
1998static void unreachable() {
1999  Printf("FATAL: ThreadSanitizer: unreachable called\n");
2000  Die();
2001}
2002
2003void InitializeInterceptors() {
2004  CHECK_GT(cur_thread()->in_rtl, 0);
2005
2006  // We need to setup it early, because functions like dlsym() can call it.
2007  REAL(memset) = internal_memset;
2008  REAL(memcpy) = internal_memcpy;
2009  REAL(memcmp) = internal_memcmp;
2010
2011  // Instruct libc malloc to consume less memory.
2012  mallopt(1, 0);  // M_MXFAST
2013  mallopt(-3, 32*1024);  // M_MMAP_THRESHOLD
2014
2015  SANITIZER_COMMON_INTERCEPTORS_INIT;
2016
2017  TSAN_INTERCEPT(setjmp);
2018  TSAN_INTERCEPT(_setjmp);
2019  TSAN_INTERCEPT(sigsetjmp);
2020  TSAN_INTERCEPT(__sigsetjmp);
2021  TSAN_INTERCEPT(longjmp);
2022  TSAN_INTERCEPT(siglongjmp);
2023
2024  TSAN_INTERCEPT(malloc);
2025  TSAN_INTERCEPT(__libc_memalign);
2026  TSAN_INTERCEPT(calloc);
2027  TSAN_INTERCEPT(realloc);
2028  TSAN_INTERCEPT(free);
2029  TSAN_INTERCEPT(cfree);
2030  TSAN_INTERCEPT(mmap);
2031  TSAN_INTERCEPT(mmap64);
2032  TSAN_INTERCEPT(munmap);
2033  TSAN_INTERCEPT(memalign);
2034  TSAN_INTERCEPT(valloc);
2035  TSAN_INTERCEPT(pvalloc);
2036  TSAN_INTERCEPT(posix_memalign);
2037
2038  TSAN_INTERCEPT(strlen);
2039  TSAN_INTERCEPT(memset);
2040  TSAN_INTERCEPT(memcpy);
2041  TSAN_INTERCEPT(memchr);
2042  TSAN_INTERCEPT(memrchr);
2043  TSAN_INTERCEPT(memmove);
2044  TSAN_INTERCEPT(memcmp);
2045  TSAN_INTERCEPT(strchr);
2046  TSAN_INTERCEPT(strchrnul);
2047  TSAN_INTERCEPT(strrchr);
2048  TSAN_INTERCEPT(strcpy);  // NOLINT
2049  TSAN_INTERCEPT(strncpy);
2050  TSAN_INTERCEPT(strstr);
2051  TSAN_INTERCEPT(strdup);
2052
2053  TSAN_INTERCEPT(pthread_create);
2054  TSAN_INTERCEPT(pthread_join);
2055  TSAN_INTERCEPT(pthread_detach);
2056
2057  TSAN_INTERCEPT(pthread_mutex_init);
2058  TSAN_INTERCEPT(pthread_mutex_destroy);
2059  TSAN_INTERCEPT(pthread_mutex_trylock);
2060  TSAN_INTERCEPT(pthread_mutex_timedlock);
2061
2062  TSAN_INTERCEPT(pthread_spin_init);
2063  TSAN_INTERCEPT(pthread_spin_destroy);
2064  TSAN_INTERCEPT(pthread_spin_lock);
2065  TSAN_INTERCEPT(pthread_spin_trylock);
2066  TSAN_INTERCEPT(pthread_spin_unlock);
2067
2068  TSAN_INTERCEPT(pthread_rwlock_init);
2069  TSAN_INTERCEPT(pthread_rwlock_destroy);
2070  TSAN_INTERCEPT(pthread_rwlock_rdlock);
2071  TSAN_INTERCEPT(pthread_rwlock_tryrdlock);
2072  TSAN_INTERCEPT(pthread_rwlock_timedrdlock);
2073  TSAN_INTERCEPT(pthread_rwlock_wrlock);
2074  TSAN_INTERCEPT(pthread_rwlock_trywrlock);
2075  TSAN_INTERCEPT(pthread_rwlock_timedwrlock);
2076  TSAN_INTERCEPT(pthread_rwlock_unlock);
2077
2078  INTERCEPT_FUNCTION_VER(pthread_cond_destroy, GLIBC_2.3.2);
2079  INTERCEPT_FUNCTION_VER(pthread_cond_timedwait, GLIBC_2.3.2);
2080
2081  TSAN_INTERCEPT(pthread_barrier_init);
2082  TSAN_INTERCEPT(pthread_barrier_destroy);
2083  TSAN_INTERCEPT(pthread_barrier_wait);
2084
2085  TSAN_INTERCEPT(pthread_once);
2086
2087  TSAN_INTERCEPT(sem_init);
2088  TSAN_INTERCEPT(sem_destroy);
2089  TSAN_INTERCEPT(sem_wait);
2090  TSAN_INTERCEPT(sem_trywait);
2091  TSAN_INTERCEPT(sem_timedwait);
2092  TSAN_INTERCEPT(sem_post);
2093  TSAN_INTERCEPT(sem_getvalue);
2094
2095  TSAN_INTERCEPT(stat);
2096  TSAN_INTERCEPT(__xstat);
2097  TSAN_INTERCEPT(stat64);
2098  TSAN_INTERCEPT(__xstat64);
2099  TSAN_INTERCEPT(lstat);
2100  TSAN_INTERCEPT(__lxstat);
2101  TSAN_INTERCEPT(lstat64);
2102  TSAN_INTERCEPT(__lxstat64);
2103  TSAN_INTERCEPT(fstat);
2104  TSAN_INTERCEPT(__fxstat);
2105  TSAN_INTERCEPT(fstat64);
2106  TSAN_INTERCEPT(__fxstat64);
2107  TSAN_INTERCEPT(open);
2108  TSAN_INTERCEPT(open64);
2109  TSAN_INTERCEPT(creat);
2110  TSAN_INTERCEPT(creat64);
2111  TSAN_INTERCEPT(dup);
2112  TSAN_INTERCEPT(dup2);
2113  TSAN_INTERCEPT(dup3);
2114  TSAN_INTERCEPT(eventfd);
2115  TSAN_INTERCEPT(signalfd);
2116  TSAN_INTERCEPT(inotify_init);
2117  TSAN_INTERCEPT(inotify_init1);
2118  TSAN_INTERCEPT(socket);
2119  TSAN_INTERCEPT(socketpair);
2120  TSAN_INTERCEPT(connect);
2121  TSAN_INTERCEPT(bind);
2122  TSAN_INTERCEPT(listen);
2123  TSAN_INTERCEPT(epoll_create);
2124  TSAN_INTERCEPT(epoll_create1);
2125  TSAN_INTERCEPT(close);
2126  TSAN_INTERCEPT(__close);
2127  TSAN_INTERCEPT(__res_iclose);
2128  TSAN_INTERCEPT(pipe);
2129  TSAN_INTERCEPT(pipe2);
2130
2131  TSAN_INTERCEPT(send);
2132  TSAN_INTERCEPT(sendmsg);
2133  TSAN_INTERCEPT(recv);
2134
2135  TSAN_INTERCEPT(unlink);
2136  TSAN_INTERCEPT(fopen);
2137  TSAN_INTERCEPT(freopen);
2138  TSAN_INTERCEPT(fclose);
2139  TSAN_INTERCEPT(fread);
2140  TSAN_INTERCEPT(fwrite);
2141  TSAN_INTERCEPT(fflush);
2142  TSAN_INTERCEPT(abort);
2143  TSAN_INTERCEPT(puts);
2144  TSAN_INTERCEPT(rmdir);
2145  TSAN_INTERCEPT(opendir);
2146
2147  TSAN_INTERCEPT(epoll_ctl);
2148  TSAN_INTERCEPT(epoll_wait);
2149
2150  TSAN_INTERCEPT(sigaction);
2151  TSAN_INTERCEPT(signal);
2152  TSAN_INTERCEPT(sigsuspend);
2153  TSAN_INTERCEPT(raise);
2154  TSAN_INTERCEPT(kill);
2155  TSAN_INTERCEPT(pthread_kill);
2156  TSAN_INTERCEPT(sleep);
2157  TSAN_INTERCEPT(usleep);
2158  TSAN_INTERCEPT(nanosleep);
2159  TSAN_INTERCEPT(gettimeofday);
2160  TSAN_INTERCEPT(getaddrinfo);
2161
2162  TSAN_INTERCEPT(mlock);
2163  TSAN_INTERCEPT(munlock);
2164  TSAN_INTERCEPT(mlockall);
2165  TSAN_INTERCEPT(munlockall);
2166
2167  TSAN_INTERCEPT(fork);
2168  TSAN_INTERCEPT(dlopen);
2169  TSAN_INTERCEPT(dlclose);
2170  TSAN_INTERCEPT(on_exit);
2171  TSAN_INTERCEPT(__cxa_atexit);
2172  TSAN_INTERCEPT(_exit);
2173
2174  // Need to setup it, because interceptors check that the function is resolved.
2175  // But atexit is emitted directly into the module, so can't be resolved.
2176  REAL(atexit) = (int(*)(void(*)()))unreachable;
2177  atexit_ctx = new(internal_alloc(MBlockAtExit, sizeof(AtExitContext)))
2178      AtExitContext();
2179
2180  if (REAL(__cxa_atexit)(&finalize, 0, 0)) {
2181    Printf("ThreadSanitizer: failed to setup atexit callback\n");
2182    Die();
2183  }
2184
2185  if (pthread_key_create(&g_thread_finalize_key, &thread_finalize)) {
2186    Printf("ThreadSanitizer: failed to create thread key\n");
2187    Die();
2188  }
2189
2190  FdInit();
2191}
2192
2193void internal_start_thread(void(*func)(void *arg), void *arg) {
2194  // Start the thread with signals blocked, otherwise it can steal users
2195  // signals.
2196  __sanitizer_kernel_sigset_t set, old;
2197  internal_sigfillset(&set);
2198  internal_sigprocmask(SIG_SETMASK, &set, &old);
2199  void *th;
2200  REAL(pthread_create)(&th, 0, (void*(*)(void *arg))func, arg);
2201  REAL(pthread_detach)(th);
2202  internal_sigprocmask(SIG_SETMASK, &old, 0);
2203}
2204
2205}  // namespace __tsan
2206