tsan_interceptors.cc revision 06cbed8b8ae64b7ace50c1b4e4eed97a2a8b9965 
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);
46extern "C" int pthread_attr_getdetachstate(void *attr, int *v);
47extern "C" int pthread_attr_setstacksize(void *attr, uptr stacksize);
48extern "C" int pthread_attr_getstacksize(void *attr, uptr *stacksize);
49extern "C" int pthread_key_create(unsigned *key, void (*destructor)(void* v));
50extern "C" int pthread_setspecific(unsigned key, const void *v);
51extern "C" int pthread_mutexattr_gettype(void *a, int *type);
52extern "C" int pthread_yield();
53extern "C" int pthread_sigmask(int how, const __sanitizer_sigset_t *set,
54                               __sanitizer_sigset_t *oldset);
55// REAL(sigfillset) defined in common interceptors.
56DECLARE_REAL(int, sigfillset, __sanitizer_sigset_t *set)
57extern "C" void *pthread_self();
58extern "C" void _exit(int status);
59extern "C" int *__errno_location();
60extern "C" int fileno_unlocked(void *stream);
61extern "C" void *__libc_malloc(uptr size);
62extern "C" void *__libc_calloc(uptr size, uptr n);
63extern "C" void *__libc_realloc(void *ptr, uptr size);
64extern "C" void __libc_free(void *ptr);
65extern "C" int mallopt(int param, int value);
66const int PTHREAD_MUTEX_RECURSIVE = 1;
67const int PTHREAD_MUTEX_RECURSIVE_NP = 1;
68const int EINVAL = 22;
69const int EBUSY = 16;
70const int EPOLL_CTL_ADD = 1;
71const int SIGILL = 4;
72const int SIGABRT = 6;
73const int SIGFPE = 8;
74const int SIGSEGV = 11;
75const int SIGPIPE = 13;
76const int SIGBUS = 7;
77const int SIGSYS = 31;
78void *const MAP_FAILED = (void*)-1;
79const int PTHREAD_BARRIER_SERIAL_THREAD = -1;
80const int MAP_FIXED = 0x10;
81typedef long long_t;  // NOLINT
82
83// From /usr/include/unistd.h
84# define F_ULOCK 0      /* Unlock a previously locked region.  */
85# define F_LOCK  1      /* Lock a region for exclusive use.  */
86# define F_TLOCK 2      /* Test and lock a region for exclusive use.  */
87# define F_TEST  3      /* Test a region for other processes locks.  */
88
89typedef void (*sighandler_t)(int sig);
90
91#define errno (*__errno_location())
92
93struct sigaction_t {
94  union {
95    sighandler_t sa_handler;
96    void (*sa_sigaction)(int sig, my_siginfo_t *siginfo, void *uctx);
97  };
98  __sanitizer_sigset_t sa_mask;
99  int sa_flags;
100  void (*sa_restorer)();
101};
102
103const sighandler_t SIG_DFL = (sighandler_t)0;
104const sighandler_t SIG_IGN = (sighandler_t)1;
105const sighandler_t SIG_ERR = (sighandler_t)-1;
106const int SA_SIGINFO = 4;
107const int SIG_SETMASK = 2;
108
109namespace std {
110struct nothrow_t {};
111}  // namespace std
112
113static sigaction_t sigactions[kSigCount];
114
115namespace __tsan {
116struct SignalDesc {
117  bool armed;
118  bool sigaction;
119  my_siginfo_t siginfo;
120  ucontext_t ctx;
121};
122
123struct SignalContext {
124  int in_blocking_func;
125  int int_signal_send;
126  int pending_signal_count;
127  SignalDesc pending_signals[kSigCount];
128};
129
130// The object is 64-byte aligned, because we want hot data to be located in
131// a single cache line if possible (it's accessed in every interceptor).
132static ALIGNED(64) char libignore_placeholder[sizeof(LibIgnore)];
133static LibIgnore *libignore() {
134  return reinterpret_cast<LibIgnore*>(&libignore_placeholder[0]);
135}
136
137void InitializeLibIgnore() {
138  libignore()->Init(*GetSuppressionContext());
139  libignore()->OnLibraryLoaded(0);
140}
141
142}  // namespace __tsan
143
144static SignalContext *SigCtx(ThreadState *thr) {
145  SignalContext *ctx = (SignalContext*)thr->signal_ctx;
146  if (ctx == 0 && thr->is_alive) {
147    ScopedInRtl in_rtl;
148    ctx = (SignalContext*)MmapOrDie(sizeof(*ctx), "SignalContext");
149    MemoryResetRange(thr, (uptr)&SigCtx, (uptr)ctx, sizeof(*ctx));
150    thr->signal_ctx = ctx;
151  }
152  return ctx;
153}
154
155static unsigned g_thread_finalize_key;
156
157class ScopedInterceptor {
158 public:
159  ScopedInterceptor(ThreadState *thr, const char *fname, uptr pc);
160  ~ScopedInterceptor();
161 private:
162  ThreadState *const thr_;
163  const int in_rtl_;
164  bool in_ignored_lib_;
165};
166
167ScopedInterceptor::ScopedInterceptor(ThreadState *thr, const char *fname,
168                                     uptr pc)
169    : thr_(thr)
170    , in_rtl_(thr->in_rtl)
171    , in_ignored_lib_(false) {
172  if (thr_->in_rtl == 0) {
173    Initialize(thr);
174    FuncEntry(thr, pc);
175    thr_->in_rtl++;
176    DPrintf("#%d: intercept %s()\n", thr_->tid, fname);
177  } else {
178    thr_->in_rtl++;
179  }
180  if (!thr_->in_ignored_lib && libignore()->IsIgnored(pc)) {
181    in_ignored_lib_ = true;
182    thr_->in_ignored_lib = true;
183    ThreadIgnoreBegin(thr_);
184  }
185}
186
187ScopedInterceptor::~ScopedInterceptor() {
188  if (in_ignored_lib_) {
189    thr_->in_ignored_lib = false;
190    ThreadIgnoreEnd(thr_);
191  }
192  thr_->in_rtl--;
193  if (thr_->in_rtl == 0) {
194    FuncExit(thr_);
195    ProcessPendingSignals(thr_);
196  }
197  CHECK_EQ(in_rtl_, thr_->in_rtl);
198}
199
200#define SCOPED_INTERCEPTOR_RAW(func, ...) \
201    ThreadState *thr = cur_thread(); \
202    StatInc(thr, StatInterceptor); \
203    StatInc(thr, StatInt_##func); \
204    const uptr caller_pc = GET_CALLER_PC(); \
205    ScopedInterceptor si(thr, #func, caller_pc); \
206    const uptr pc = __sanitizer::StackTrace::GetCurrentPc(); \
207    (void)pc; \
208/**/
209
210#define SCOPED_TSAN_INTERCEPTOR(func, ...) \
211    SCOPED_INTERCEPTOR_RAW(func, __VA_ARGS__); \
212    if (REAL(func) == 0) { \
213      Printf("FATAL: ThreadSanitizer: failed to intercept %s\n", #func); \
214      Die(); \
215    } \
216    if (thr->in_rtl > 1 || thr->in_ignored_lib) \
217      return REAL(func)(__VA_ARGS__); \
218/**/
219
220#define TSAN_INTERCEPTOR(ret, func, ...) INTERCEPTOR(ret, func, __VA_ARGS__)
221#define TSAN_INTERCEPT(func) INTERCEPT_FUNCTION(func)
222
223#define BLOCK_REAL(name) (BlockingCall(thr), REAL(name))
224
225struct BlockingCall {
226  explicit BlockingCall(ThreadState *thr)
227      : ctx(SigCtx(thr)) {
228    ctx->in_blocking_func++;
229  }
230
231  ~BlockingCall() {
232    ctx->in_blocking_func--;
233  }
234
235  SignalContext *ctx;
236};
237
238TSAN_INTERCEPTOR(unsigned, sleep, unsigned sec) {
239  SCOPED_TSAN_INTERCEPTOR(sleep, sec);
240  unsigned res = BLOCK_REAL(sleep)(sec);
241  AfterSleep(thr, pc);
242  return res;
243}
244
245TSAN_INTERCEPTOR(int, usleep, long_t usec) {
246  SCOPED_TSAN_INTERCEPTOR(usleep, usec);
247  int res = BLOCK_REAL(usleep)(usec);
248  AfterSleep(thr, pc);
249  return res;
250}
251
252TSAN_INTERCEPTOR(int, nanosleep, void *req, void *rem) {
253  SCOPED_TSAN_INTERCEPTOR(nanosleep, req, rem);
254  int res = BLOCK_REAL(nanosleep)(req, rem);
255  AfterSleep(thr, pc);
256  return res;
257}
258
259TSAN_INTERCEPTOR(void*, dlopen, const char *filename, int flag) {
260  SCOPED_INTERCEPTOR_RAW(dlopen, filename, flag);
261  // dlopen will execute global constructors, so it must be not in rtl.
262  CHECK_EQ(thr->in_rtl, 1);
263  thr->in_rtl = 0;
264  void *res = REAL(dlopen)(filename, flag);
265  thr->in_rtl = 1;
266  libignore()->OnLibraryLoaded(filename);
267  return res;
268}
269
270TSAN_INTERCEPTOR(int, dlclose, void *handle) {
271  SCOPED_INTERCEPTOR_RAW(dlclose, handle);
272  // dlclose will execute global destructors, so it must be not in rtl.
273  CHECK_EQ(thr->in_rtl, 1);
274  thr->in_rtl = 0;
275  int res = REAL(dlclose)(handle);
276  thr->in_rtl = 1;
277  libignore()->OnLibraryUnloaded();
278  return res;
279}
280
281class AtExitContext {
282 public:
283  AtExitContext()
284    : mtx_(MutexTypeAtExit, StatMtxAtExit)
285    , pos_() {
286  }
287
288  typedef void(*atexit_t)();
289
290  int atexit(ThreadState *thr, uptr pc, bool is_on_exit,
291             atexit_t f, void *arg) {
292    Lock l(&mtx_);
293    if (pos_ == kMaxAtExit)
294      return 1;
295    Release(thr, pc, (uptr)this);
296    stack_[pos_] = f;
297    args_[pos_] = arg;
298    is_on_exits_[pos_] = is_on_exit;
299    pos_++;
300    return 0;
301  }
302
303  void exit(ThreadState *thr, uptr pc) {
304    CHECK_EQ(thr->in_rtl, 0);
305    for (;;) {
306      atexit_t f = 0;
307      void *arg = 0;
308      bool is_on_exit = false;
309      {
310        Lock l(&mtx_);
311        if (pos_) {
312          pos_--;
313          f = stack_[pos_];
314          arg = args_[pos_];
315          is_on_exit = is_on_exits_[pos_];
316          ScopedInRtl in_rtl;
317          Acquire(thr, pc, (uptr)this);
318        }
319      }
320      if (f == 0)
321        break;
322      DPrintf("#%d: executing atexit func %p\n", thr->tid, f);
323      CHECK_EQ(thr->in_rtl, 0);
324      if (is_on_exit)
325        ((void(*)(int status, void *arg))f)(0, arg);
326      else
327        ((void(*)(void *arg, void *dso))f)(arg, 0);
328    }
329  }
330
331 private:
332  static const int kMaxAtExit = 128;
333  Mutex mtx_;
334  atexit_t stack_[kMaxAtExit];
335  void *args_[kMaxAtExit];
336  bool is_on_exits_[kMaxAtExit];
337  int pos_;
338};
339
340static AtExitContext *atexit_ctx;
341
342TSAN_INTERCEPTOR(int, atexit, void (*f)()) {
343  if (cur_thread()->in_symbolizer)
344    return 0;
345  SCOPED_TSAN_INTERCEPTOR(atexit, f);
346  return atexit_ctx->atexit(thr, pc, false, (void(*)())f, 0);
347}
348
349TSAN_INTERCEPTOR(int, on_exit, void(*f)(int, void*), void *arg) {
350  if (cur_thread()->in_symbolizer)
351    return 0;
352  SCOPED_TSAN_INTERCEPTOR(on_exit, f, arg);
353  return atexit_ctx->atexit(thr, pc, true, (void(*)())f, arg);
354}
355
356TSAN_INTERCEPTOR(int, __cxa_atexit, void (*f)(void *a), void *arg, void *dso) {
357  if (cur_thread()->in_symbolizer)
358    return 0;
359  SCOPED_TSAN_INTERCEPTOR(__cxa_atexit, f, arg, dso);
360  if (dso) {
361    // Memory allocation in __cxa_atexit will race with free during exit,
362    // because we do not see synchronization around atexit callback list.
363    ThreadIgnoreBegin(thr);
364    int res = REAL(__cxa_atexit)(f, arg, dso);
365    ThreadIgnoreEnd(thr);
366    return res;
367  }
368  return atexit_ctx->atexit(thr, pc, false, (void(*)())f, arg);
369}
370
371// Cleanup old bufs.
372static void JmpBufGarbageCollect(ThreadState *thr, uptr sp) {
373  for (uptr i = 0; i < thr->jmp_bufs.Size(); i++) {
374    JmpBuf *buf = &thr->jmp_bufs[i];
375    if (buf->sp <= sp) {
376      uptr sz = thr->jmp_bufs.Size();
377      thr->jmp_bufs[i] = thr->jmp_bufs[sz - 1];
378      thr->jmp_bufs.PopBack();
379      i--;
380    }
381  }
382}
383
384static void SetJmp(ThreadState *thr, uptr sp, uptr mangled_sp) {
385  if (thr->shadow_stack_pos == 0)  // called from libc guts during bootstrap
386    return;
387  // Cleanup old bufs.
388  JmpBufGarbageCollect(thr, sp);
389  // Remember the buf.
390  JmpBuf *buf = thr->jmp_bufs.PushBack();
391  buf->sp = sp;
392  buf->mangled_sp = mangled_sp;
393  buf->shadow_stack_pos = thr->shadow_stack_pos;
394}
395
396static void LongJmp(ThreadState *thr, uptr *env) {
397  uptr mangled_sp = env[6];
398  // Find the saved buf by mangled_sp.
399  for (uptr i = 0; i < thr->jmp_bufs.Size(); i++) {
400    JmpBuf *buf = &thr->jmp_bufs[i];
401    if (buf->mangled_sp == mangled_sp) {
402      CHECK_GE(thr->shadow_stack_pos, buf->shadow_stack_pos);
403      // Unwind the stack.
404      while (thr->shadow_stack_pos > buf->shadow_stack_pos)
405        FuncExit(thr);
406      JmpBufGarbageCollect(thr, buf->sp - 1);  // do not collect buf->sp
407      return;
408    }
409  }
410  Printf("ThreadSanitizer: can't find longjmp buf\n");
411  CHECK(0);
412}
413
414// FIXME: put everything below into a common extern "C" block?
415extern "C" void __tsan_setjmp(uptr sp, uptr mangled_sp) {
416  ScopedInRtl in_rtl;
417  SetJmp(cur_thread(), sp, mangled_sp);
418}
419
420// Not called.  Merely to satisfy TSAN_INTERCEPT().
421extern "C" SANITIZER_INTERFACE_ATTRIBUTE
422int __interceptor_setjmp(void *env);
423extern "C" int __interceptor_setjmp(void *env) {
424  CHECK(0);
425  return 0;
426}
427
428// FIXME: any reason to have a separate declaration?
429extern "C" SANITIZER_INTERFACE_ATTRIBUTE
430int __interceptor__setjmp(void *env);
431extern "C" int __interceptor__setjmp(void *env) {
432  CHECK(0);
433  return 0;
434}
435
436extern "C" SANITIZER_INTERFACE_ATTRIBUTE
437int __interceptor_sigsetjmp(void *env);
438extern "C" int __interceptor_sigsetjmp(void *env) {
439  CHECK(0);
440  return 0;
441}
442
443extern "C" SANITIZER_INTERFACE_ATTRIBUTE
444int __interceptor___sigsetjmp(void *env);
445extern "C" int __interceptor___sigsetjmp(void *env) {
446  CHECK(0);
447  return 0;
448}
449
450extern "C" int setjmp(void *env);
451extern "C" int _setjmp(void *env);
452extern "C" int sigsetjmp(void *env);
453extern "C" int __sigsetjmp(void *env);
454DEFINE_REAL(int, setjmp, void *env)
455DEFINE_REAL(int, _setjmp, void *env)
456DEFINE_REAL(int, sigsetjmp, void *env)
457DEFINE_REAL(int, __sigsetjmp, void *env)
458
459TSAN_INTERCEPTOR(void, longjmp, uptr *env, int val) {
460  {
461    SCOPED_TSAN_INTERCEPTOR(longjmp, env, val);
462  }
463  LongJmp(cur_thread(), env);
464  REAL(longjmp)(env, val);
465}
466
467TSAN_INTERCEPTOR(void, siglongjmp, uptr *env, int val) {
468  {
469    SCOPED_TSAN_INTERCEPTOR(siglongjmp, env, val);
470  }
471  LongJmp(cur_thread(), env);
472  REAL(siglongjmp)(env, val);
473}
474
475TSAN_INTERCEPTOR(void*, malloc, uptr size) {
476  if (cur_thread()->in_symbolizer)
477    return __libc_malloc(size);
478  void *p = 0;
479  {
480    SCOPED_INTERCEPTOR_RAW(malloc, size);
481    p = user_alloc(thr, pc, size);
482  }
483  invoke_malloc_hook(p, size);
484  return p;
485}
486
487TSAN_INTERCEPTOR(void*, __libc_memalign, uptr align, uptr sz) {
488  SCOPED_TSAN_INTERCEPTOR(__libc_memalign, align, sz);
489  return user_alloc(thr, pc, sz, align);
490}
491
492TSAN_INTERCEPTOR(void*, calloc, uptr size, uptr n) {
493  if (cur_thread()->in_symbolizer)
494    return __libc_calloc(size, n);
495  if (__sanitizer::CallocShouldReturnNullDueToOverflow(size, n))
496    return AllocatorReturnNull();
497  void *p = 0;
498  {
499    SCOPED_INTERCEPTOR_RAW(calloc, size, n);
500    p = user_alloc(thr, pc, n * size);
501    if (p)
502      internal_memset(p, 0, n * size);
503  }
504  invoke_malloc_hook(p, n * size);
505  return p;
506}
507
508TSAN_INTERCEPTOR(void*, realloc, void *p, uptr size) {
509  if (cur_thread()->in_symbolizer)
510    return __libc_realloc(p, size);
511  if (p)
512    invoke_free_hook(p);
513  {
514    SCOPED_INTERCEPTOR_RAW(realloc, p, size);
515    p = user_realloc(thr, pc, p, size);
516  }
517  invoke_malloc_hook(p, size);
518  return p;
519}
520
521TSAN_INTERCEPTOR(void, free, void *p) {
522  if (p == 0)
523    return;
524  if (cur_thread()->in_symbolizer)
525    return __libc_free(p);
526  invoke_free_hook(p);
527  SCOPED_INTERCEPTOR_RAW(free, p);
528  user_free(thr, pc, p);
529}
530
531TSAN_INTERCEPTOR(void, cfree, void *p) {
532  if (p == 0)
533    return;
534  if (cur_thread()->in_symbolizer)
535    return __libc_free(p);
536  invoke_free_hook(p);
537  SCOPED_INTERCEPTOR_RAW(cfree, p);
538  user_free(thr, pc, p);
539}
540
541TSAN_INTERCEPTOR(uptr, malloc_usable_size, void *p) {
542  SCOPED_INTERCEPTOR_RAW(malloc_usable_size, p);
543  return user_alloc_usable_size(thr, pc, p);
544}
545
546#define OPERATOR_NEW_BODY(mangled_name) \
547  if (cur_thread()->in_symbolizer) \
548    return __libc_malloc(size); \
549  void *p = 0; \
550  {  \
551    SCOPED_INTERCEPTOR_RAW(mangled_name, size); \
552    p = user_alloc(thr, pc, size); \
553  }  \
554  invoke_malloc_hook(p, size);  \
555  return p;
556
557SANITIZER_INTERFACE_ATTRIBUTE
558void *operator new(__sanitizer::uptr size);
559void *operator new(__sanitizer::uptr size) {
560  OPERATOR_NEW_BODY(_Znwm);
561}
562
563SANITIZER_INTERFACE_ATTRIBUTE
564void *operator new[](__sanitizer::uptr size);
565void *operator new[](__sanitizer::uptr size) {
566  OPERATOR_NEW_BODY(_Znam);
567}
568
569SANITIZER_INTERFACE_ATTRIBUTE
570void *operator new(__sanitizer::uptr size, std::nothrow_t const&);
571void *operator new(__sanitizer::uptr size, std::nothrow_t const&) {
572  OPERATOR_NEW_BODY(_ZnwmRKSt9nothrow_t);
573}
574
575SANITIZER_INTERFACE_ATTRIBUTE
576void *operator new[](__sanitizer::uptr size, std::nothrow_t const&);
577void *operator new[](__sanitizer::uptr size, std::nothrow_t const&) {
578  OPERATOR_NEW_BODY(_ZnamRKSt9nothrow_t);
579}
580
581#define OPERATOR_DELETE_BODY(mangled_name) \
582  if (ptr == 0) return;  \
583  if (cur_thread()->in_symbolizer) \
584    return __libc_free(ptr); \
585  invoke_free_hook(ptr);  \
586  SCOPED_INTERCEPTOR_RAW(mangled_name, ptr);  \
587  user_free(thr, pc, ptr);
588
589SANITIZER_INTERFACE_ATTRIBUTE
590void operator delete(void *ptr);
591void operator delete(void *ptr) {
592  OPERATOR_DELETE_BODY(_ZdlPv);
593}
594
595SANITIZER_INTERFACE_ATTRIBUTE
596void operator delete[](void *ptr);
597void operator delete[](void *ptr) {
598  OPERATOR_DELETE_BODY(_ZdlPvRKSt9nothrow_t);
599}
600
601SANITIZER_INTERFACE_ATTRIBUTE
602void operator delete(void *ptr, std::nothrow_t const&);
603void operator delete(void *ptr, std::nothrow_t const&) {
604  OPERATOR_DELETE_BODY(_ZdaPv);
605}
606
607SANITIZER_INTERFACE_ATTRIBUTE
608void operator delete[](void *ptr, std::nothrow_t const&);
609void operator delete[](void *ptr, std::nothrow_t const&) {
610  OPERATOR_DELETE_BODY(_ZdaPvRKSt9nothrow_t);
611}
612
613TSAN_INTERCEPTOR(uptr, strlen, const char *s) {
614  SCOPED_TSAN_INTERCEPTOR(strlen, s);
615  uptr len = internal_strlen(s);
616  MemoryAccessRange(thr, pc, (uptr)s, len + 1, false);
617  return len;
618}
619
620TSAN_INTERCEPTOR(void*, memset, void *dst, int v, uptr size) {
621  SCOPED_TSAN_INTERCEPTOR(memset, dst, v, size);
622  MemoryAccessRange(thr, pc, (uptr)dst, size, true);
623  return internal_memset(dst, v, size);
624}
625
626TSAN_INTERCEPTOR(void*, memcpy, void *dst, const void *src, uptr size) {
627  SCOPED_TSAN_INTERCEPTOR(memcpy, dst, src, size);
628  MemoryAccessRange(thr, pc, (uptr)dst, size, true);
629  MemoryAccessRange(thr, pc, (uptr)src, size, false);
630  return internal_memcpy(dst, src, size);
631}
632
633TSAN_INTERCEPTOR(int, memcmp, const void *s1, const void *s2, uptr n) {
634  SCOPED_TSAN_INTERCEPTOR(memcmp, s1, s2, n);
635  int res = 0;
636  uptr len = 0;
637  for (; len < n; len++) {
638    if ((res = ((unsigned char*)s1)[len] - ((unsigned char*)s2)[len]))
639      break;
640  }
641  MemoryAccessRange(thr, pc, (uptr)s1, len < n ? len + 1 : n, false);
642  MemoryAccessRange(thr, pc, (uptr)s2, len < n ? len + 1 : n, false);
643  return res;
644}
645
646TSAN_INTERCEPTOR(void*, memchr, void *s, int c, uptr n) {
647  SCOPED_TSAN_INTERCEPTOR(memchr, s, c, n);
648  void *res = REAL(memchr)(s, c, n);
649  uptr len = res ? (char*)res - (char*)s + 1 : n;
650  MemoryAccessRange(thr, pc, (uptr)s, len, false);
651  return res;
652}
653
654TSAN_INTERCEPTOR(void*, memrchr, char *s, int c, uptr n) {
655  SCOPED_TSAN_INTERCEPTOR(memrchr, s, c, n);
656  MemoryAccessRange(thr, pc, (uptr)s, n, false);
657  return REAL(memrchr)(s, c, n);
658}
659
660TSAN_INTERCEPTOR(void*, memmove, void *dst, void *src, uptr n) {
661  SCOPED_TSAN_INTERCEPTOR(memmove, dst, src, n);
662  MemoryAccessRange(thr, pc, (uptr)dst, n, true);
663  MemoryAccessRange(thr, pc, (uptr)src, n, false);
664  return REAL(memmove)(dst, src, n);
665}
666
667TSAN_INTERCEPTOR(char*, strchr, char *s, int c) {
668  SCOPED_TSAN_INTERCEPTOR(strchr, s, c);
669  char *res = REAL(strchr)(s, c);
670  uptr len = res ? (char*)res - (char*)s + 1 : internal_strlen(s) + 1;
671  MemoryAccessRange(thr, pc, (uptr)s, len, false);
672  return res;
673}
674
675TSAN_INTERCEPTOR(char*, strchrnul, char *s, int c) {
676  SCOPED_TSAN_INTERCEPTOR(strchrnul, s, c);
677  char *res = REAL(strchrnul)(s, c);
678  uptr len = (char*)res - (char*)s + 1;
679  MemoryAccessRange(thr, pc, (uptr)s, len, false);
680  return res;
681}
682
683TSAN_INTERCEPTOR(char*, strrchr, char *s, int c) {
684  SCOPED_TSAN_INTERCEPTOR(strrchr, s, c);
685  MemoryAccessRange(thr, pc, (uptr)s, internal_strlen(s) + 1, false);
686  return REAL(strrchr)(s, c);
687}
688
689TSAN_INTERCEPTOR(char*, strcpy, char *dst, const char *src) {  // NOLINT
690  SCOPED_TSAN_INTERCEPTOR(strcpy, dst, src);  // NOLINT
691  uptr srclen = internal_strlen(src);
692  MemoryAccessRange(thr, pc, (uptr)dst, srclen + 1, true);
693  MemoryAccessRange(thr, pc, (uptr)src, srclen + 1, false);
694  return REAL(strcpy)(dst, src);  // NOLINT
695}
696
697TSAN_INTERCEPTOR(char*, strncpy, char *dst, char *src, uptr n) {
698  SCOPED_TSAN_INTERCEPTOR(strncpy, dst, src, n);
699  uptr srclen = internal_strnlen(src, n);
700  MemoryAccessRange(thr, pc, (uptr)dst, n, true);
701  MemoryAccessRange(thr, pc, (uptr)src, min(srclen + 1, n), false);
702  return REAL(strncpy)(dst, src, n);
703}
704
705TSAN_INTERCEPTOR(const char*, strstr, const char *s1, const char *s2) {
706  SCOPED_TSAN_INTERCEPTOR(strstr, s1, s2);
707  const char *res = REAL(strstr)(s1, s2);
708  uptr len1 = internal_strlen(s1);
709  uptr len2 = internal_strlen(s2);
710  MemoryAccessRange(thr, pc, (uptr)s1, len1 + 1, false);
711  MemoryAccessRange(thr, pc, (uptr)s2, len2 + 1, false);
712  return res;
713}
714
715TSAN_INTERCEPTOR(char*, strdup, const char *str) {
716  SCOPED_TSAN_INTERCEPTOR(strdup, str);
717  // strdup will call malloc, so no instrumentation is required here.
718  return REAL(strdup)(str);
719}
720
721static bool fix_mmap_addr(void **addr, long_t sz, int flags) {
722  if (*addr) {
723    if (!IsAppMem((uptr)*addr) || !IsAppMem((uptr)*addr + sz - 1)) {
724      if (flags & MAP_FIXED) {
725        errno = EINVAL;
726        return false;
727      } else {
728        *addr = 0;
729      }
730    }
731  }
732  return true;
733}
734
735TSAN_INTERCEPTOR(void*, mmap, void *addr, long_t sz, int prot,
736                         int flags, int fd, unsigned off) {
737  SCOPED_TSAN_INTERCEPTOR(mmap, addr, sz, prot, flags, fd, off);
738  if (!fix_mmap_addr(&addr, sz, flags))
739    return MAP_FAILED;
740  void *res = REAL(mmap)(addr, sz, prot, flags, fd, off);
741  if (res != MAP_FAILED) {
742    if (fd > 0)
743      FdAccess(thr, pc, fd);
744    MemoryRangeImitateWrite(thr, pc, (uptr)res, sz);
745  }
746  return res;
747}
748
749TSAN_INTERCEPTOR(void*, mmap64, void *addr, long_t sz, int prot,
750                           int flags, int fd, u64 off) {
751  SCOPED_TSAN_INTERCEPTOR(mmap64, addr, sz, prot, flags, fd, off);
752  if (!fix_mmap_addr(&addr, sz, flags))
753    return MAP_FAILED;
754  void *res = REAL(mmap64)(addr, sz, prot, flags, fd, off);
755  if (res != MAP_FAILED) {
756    if (fd > 0)
757      FdAccess(thr, pc, fd);
758    MemoryRangeImitateWrite(thr, pc, (uptr)res, sz);
759  }
760  return res;
761}
762
763TSAN_INTERCEPTOR(int, munmap, void *addr, long_t sz) {
764  SCOPED_TSAN_INTERCEPTOR(munmap, addr, sz);
765  DontNeedShadowFor((uptr)addr, sz);
766  int res = REAL(munmap)(addr, sz);
767  return res;
768}
769
770TSAN_INTERCEPTOR(void*, memalign, uptr align, uptr sz) {
771  SCOPED_INTERCEPTOR_RAW(memalign, align, sz);
772  return user_alloc(thr, pc, sz, align);
773}
774
775TSAN_INTERCEPTOR(void*, valloc, uptr sz) {
776  SCOPED_INTERCEPTOR_RAW(valloc, sz);
777  return user_alloc(thr, pc, sz, GetPageSizeCached());
778}
779
780TSAN_INTERCEPTOR(void*, pvalloc, uptr sz) {
781  SCOPED_INTERCEPTOR_RAW(pvalloc, sz);
782  sz = RoundUp(sz, GetPageSizeCached());
783  return user_alloc(thr, pc, sz, GetPageSizeCached());
784}
785
786TSAN_INTERCEPTOR(int, posix_memalign, void **memptr, uptr align, uptr sz) {
787  SCOPED_INTERCEPTOR_RAW(posix_memalign, memptr, align, sz);
788  *memptr = user_alloc(thr, pc, sz, align);
789  return 0;
790}
791
792// Used in thread-safe function static initialization.
793extern "C" int INTERFACE_ATTRIBUTE __cxa_guard_acquire(atomic_uint32_t *g) {
794  SCOPED_INTERCEPTOR_RAW(__cxa_guard_acquire, g);
795  for (;;) {
796    u32 cmp = atomic_load(g, memory_order_acquire);
797    if (cmp == 0) {
798      if (atomic_compare_exchange_strong(g, &cmp, 1<<16, memory_order_relaxed))
799        return 1;
800    } else if (cmp == 1) {
801      Acquire(thr, pc, (uptr)g);
802      return 0;
803    } else {
804      internal_sched_yield();
805    }
806  }
807}
808
809extern "C" void INTERFACE_ATTRIBUTE __cxa_guard_release(atomic_uint32_t *g) {
810  SCOPED_INTERCEPTOR_RAW(__cxa_guard_release, g);
811  Release(thr, pc, (uptr)g);
812  atomic_store(g, 1, memory_order_release);
813}
814
815extern "C" void INTERFACE_ATTRIBUTE __cxa_guard_abort(atomic_uint32_t *g) {
816  SCOPED_INTERCEPTOR_RAW(__cxa_guard_abort, g);
817  atomic_store(g, 0, memory_order_relaxed);
818}
819
820static void thread_finalize(void *v) {
821  uptr iter = (uptr)v;
822  if (iter > 1) {
823    if (pthread_setspecific(g_thread_finalize_key, (void*)(iter - 1))) {
824      Printf("ThreadSanitizer: failed to set thread key\n");
825      Die();
826    }
827    return;
828  }
829  {
830    ScopedInRtl in_rtl;
831    ThreadState *thr = cur_thread();
832    ThreadFinish(thr);
833    SignalContext *sctx = thr->signal_ctx;
834    if (sctx) {
835      thr->signal_ctx = 0;
836      UnmapOrDie(sctx, sizeof(*sctx));
837    }
838  }
839}
840
841
842struct ThreadParam {
843  void* (*callback)(void *arg);
844  void *param;
845  atomic_uintptr_t tid;
846};
847
848extern "C" void *__tsan_thread_start_func(void *arg) {
849  ThreadParam *p = (ThreadParam*)arg;
850  void* (*callback)(void *arg) = p->callback;
851  void *param = p->param;
852  int tid = 0;
853  {
854    ThreadState *thr = cur_thread();
855    ScopedInRtl in_rtl;
856    if (pthread_setspecific(g_thread_finalize_key,
857                            (void *)kPthreadDestructorIterations)) {
858      Printf("ThreadSanitizer: failed to set thread key\n");
859      Die();
860    }
861    while ((tid = atomic_load(&p->tid, memory_order_acquire)) == 0)
862      pthread_yield();
863    atomic_store(&p->tid, 0, memory_order_release);
864    ThreadStart(thr, tid, GetTid());
865    CHECK_EQ(thr->in_rtl, 1);
866  }
867  void *res = callback(param);
868  // Prevent the callback from being tail called,
869  // it mixes up stack traces.
870  volatile int foo = 42;
871  foo++;
872  return res;
873}
874
875TSAN_INTERCEPTOR(int, pthread_create,
876    void *th, void *attr, void *(*callback)(void*), void * param) {
877  SCOPED_INTERCEPTOR_RAW(pthread_create, th, attr, callback, param);
878  __sanitizer_pthread_attr_t myattr;
879  if (attr == 0) {
880    pthread_attr_init(&myattr);
881    attr = &myattr;
882  }
883  int detached = 0;
884  pthread_attr_getdetachstate(attr, &detached);
885  AdjustStackSizeLinux(attr);
886
887  ThreadParam p;
888  p.callback = callback;
889  p.param = param;
890  atomic_store(&p.tid, 0, memory_order_relaxed);
891  int res = REAL(pthread_create)(th, attr, __tsan_thread_start_func, &p);
892  if (res == 0) {
893    int tid = ThreadCreate(thr, pc, *(uptr*)th, detached);
894    CHECK_NE(tid, 0);
895    atomic_store(&p.tid, tid, memory_order_release);
896    while (atomic_load(&p.tid, memory_order_acquire) != 0)
897      pthread_yield();
898  }
899  if (attr == &myattr)
900    pthread_attr_destroy(&myattr);
901  return res;
902}
903
904TSAN_INTERCEPTOR(int, pthread_join, void *th, void **ret) {
905  SCOPED_INTERCEPTOR_RAW(pthread_join, th, ret);
906  int tid = ThreadTid(thr, pc, (uptr)th);
907  int res = BLOCK_REAL(pthread_join)(th, ret);
908  if (res == 0) {
909    ThreadJoin(thr, pc, tid);
910  }
911  return res;
912}
913
914TSAN_INTERCEPTOR(int, pthread_detach, void *th) {
915  SCOPED_TSAN_INTERCEPTOR(pthread_detach, th);
916  int tid = ThreadTid(thr, pc, (uptr)th);
917  int res = REAL(pthread_detach)(th);
918  if (res == 0) {
919    ThreadDetach(thr, pc, tid);
920  }
921  return res;
922}
923
924TSAN_INTERCEPTOR(int, pthread_mutex_init, void *m, void *a) {
925  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_init, m, a);
926  int res = REAL(pthread_mutex_init)(m, a);
927  if (res == 0) {
928    bool recursive = false;
929    if (a) {
930      int type = 0;
931      if (pthread_mutexattr_gettype(a, &type) == 0)
932        recursive = (type == PTHREAD_MUTEX_RECURSIVE
933            || type == PTHREAD_MUTEX_RECURSIVE_NP);
934    }
935    MutexCreate(thr, pc, (uptr)m, false, recursive, false);
936  }
937  return res;
938}
939
940TSAN_INTERCEPTOR(int, pthread_mutex_destroy, void *m) {
941  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_destroy, m);
942  int res = REAL(pthread_mutex_destroy)(m);
943  if (res == 0 || res == EBUSY) {
944    MutexDestroy(thr, pc, (uptr)m);
945  }
946  return res;
947}
948
949TSAN_INTERCEPTOR(int, pthread_mutex_lock, void *m) {
950  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_lock, m);
951  int res = REAL(pthread_mutex_lock)(m);
952  if (res == 0) {
953    MutexLock(thr, pc, (uptr)m);
954  }
955  return res;
956}
957
958TSAN_INTERCEPTOR(int, pthread_mutex_trylock, void *m) {
959  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_trylock, m);
960  int res = REAL(pthread_mutex_trylock)(m);
961  if (res == 0) {
962    MutexLock(thr, pc, (uptr)m);
963  }
964  return res;
965}
966
967TSAN_INTERCEPTOR(int, pthread_mutex_timedlock, void *m, void *abstime) {
968  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_timedlock, m, abstime);
969  int res = REAL(pthread_mutex_timedlock)(m, abstime);
970  if (res == 0) {
971    MutexLock(thr, pc, (uptr)m);
972  }
973  return res;
974}
975
976TSAN_INTERCEPTOR(int, pthread_mutex_unlock, void *m) {
977  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_unlock, m);
978  MutexUnlock(thr, pc, (uptr)m);
979  int res = REAL(pthread_mutex_unlock)(m);
980  return res;
981}
982
983TSAN_INTERCEPTOR(int, pthread_spin_init, void *m, int pshared) {
984  SCOPED_TSAN_INTERCEPTOR(pthread_spin_init, m, pshared);
985  int res = REAL(pthread_spin_init)(m, pshared);
986  if (res == 0) {
987    MutexCreate(thr, pc, (uptr)m, false, false, false);
988  }
989  return res;
990}
991
992TSAN_INTERCEPTOR(int, pthread_spin_destroy, void *m) {
993  SCOPED_TSAN_INTERCEPTOR(pthread_spin_destroy, m);
994  int res = REAL(pthread_spin_destroy)(m);
995  if (res == 0) {
996    MutexDestroy(thr, pc, (uptr)m);
997  }
998  return res;
999}
1000
1001TSAN_INTERCEPTOR(int, pthread_spin_lock, void *m) {
1002  SCOPED_TSAN_INTERCEPTOR(pthread_spin_lock, m);
1003  int res = REAL(pthread_spin_lock)(m);
1004  if (res == 0) {
1005    MutexLock(thr, pc, (uptr)m);
1006  }
1007  return res;
1008}
1009
1010TSAN_INTERCEPTOR(int, pthread_spin_trylock, void *m) {
1011  SCOPED_TSAN_INTERCEPTOR(pthread_spin_trylock, m);
1012  int res = REAL(pthread_spin_trylock)(m);
1013  if (res == 0) {
1014    MutexLock(thr, pc, (uptr)m);
1015  }
1016  return res;
1017}
1018
1019TSAN_INTERCEPTOR(int, pthread_spin_unlock, void *m) {
1020  SCOPED_TSAN_INTERCEPTOR(pthread_spin_unlock, m);
1021  MutexUnlock(thr, pc, (uptr)m);
1022  int res = REAL(pthread_spin_unlock)(m);
1023  return res;
1024}
1025
1026TSAN_INTERCEPTOR(int, pthread_rwlock_init, void *m, void *a) {
1027  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_init, m, a);
1028  int res = REAL(pthread_rwlock_init)(m, a);
1029  if (res == 0) {
1030    MutexCreate(thr, pc, (uptr)m, true, false, false);
1031  }
1032  return res;
1033}
1034
1035TSAN_INTERCEPTOR(int, pthread_rwlock_destroy, void *m) {
1036  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_destroy, m);
1037  int res = REAL(pthread_rwlock_destroy)(m);
1038  if (res == 0) {
1039    MutexDestroy(thr, pc, (uptr)m);
1040  }
1041  return res;
1042}
1043
1044TSAN_INTERCEPTOR(int, pthread_rwlock_rdlock, void *m) {
1045  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_rdlock, m);
1046  int res = REAL(pthread_rwlock_rdlock)(m);
1047  if (res == 0) {
1048    MutexReadLock(thr, pc, (uptr)m);
1049  }
1050  return res;
1051}
1052
1053TSAN_INTERCEPTOR(int, pthread_rwlock_tryrdlock, void *m) {
1054  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_tryrdlock, m);
1055  int res = REAL(pthread_rwlock_tryrdlock)(m);
1056  if (res == 0) {
1057    MutexReadLock(thr, pc, (uptr)m);
1058  }
1059  return res;
1060}
1061
1062TSAN_INTERCEPTOR(int, pthread_rwlock_timedrdlock, void *m, void *abstime) {
1063  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedrdlock, m, abstime);
1064  int res = REAL(pthread_rwlock_timedrdlock)(m, abstime);
1065  if (res == 0) {
1066    MutexReadLock(thr, pc, (uptr)m);
1067  }
1068  return res;
1069}
1070
1071TSAN_INTERCEPTOR(int, pthread_rwlock_wrlock, void *m) {
1072  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_wrlock, m);
1073  int res = REAL(pthread_rwlock_wrlock)(m);
1074  if (res == 0) {
1075    MutexLock(thr, pc, (uptr)m);
1076  }
1077  return res;
1078}
1079
1080TSAN_INTERCEPTOR(int, pthread_rwlock_trywrlock, void *m) {
1081  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_trywrlock, m);
1082  int res = REAL(pthread_rwlock_trywrlock)(m);
1083  if (res == 0) {
1084    MutexLock(thr, pc, (uptr)m);
1085  }
1086  return res;
1087}
1088
1089TSAN_INTERCEPTOR(int, pthread_rwlock_timedwrlock, void *m, void *abstime) {
1090  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedwrlock, m, abstime);
1091  int res = REAL(pthread_rwlock_timedwrlock)(m, abstime);
1092  if (res == 0) {
1093    MutexLock(thr, pc, (uptr)m);
1094  }
1095  return res;
1096}
1097
1098TSAN_INTERCEPTOR(int, pthread_rwlock_unlock, void *m) {
1099  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_unlock, m);
1100  MutexReadOrWriteUnlock(thr, pc, (uptr)m);
1101  int res = REAL(pthread_rwlock_unlock)(m);
1102  return res;
1103}
1104
1105TSAN_INTERCEPTOR(int, pthread_cond_init, void *c, void *a) {
1106  SCOPED_TSAN_INTERCEPTOR(pthread_cond_init, c, a);
1107  MemoryWrite(thr, pc, (uptr)c, kSizeLog1);
1108  int res = REAL(pthread_cond_init)(c, a);
1109  return res;
1110}
1111
1112TSAN_INTERCEPTOR(int, pthread_cond_destroy, void *c) {
1113  SCOPED_TSAN_INTERCEPTOR(pthread_cond_destroy, c);
1114  MemoryWrite(thr, pc, (uptr)c, kSizeLog1);
1115  int res = REAL(pthread_cond_destroy)(c);
1116  return res;
1117}
1118
1119TSAN_INTERCEPTOR(int, pthread_cond_signal, void *c) {
1120  SCOPED_TSAN_INTERCEPTOR(pthread_cond_signal, c);
1121  MemoryRead(thr, pc, (uptr)c, kSizeLog1);
1122  int res = REAL(pthread_cond_signal)(c);
1123  return res;
1124}
1125
1126TSAN_INTERCEPTOR(int, pthread_cond_broadcast, void *c) {
1127  SCOPED_TSAN_INTERCEPTOR(pthread_cond_broadcast, c);
1128  MemoryRead(thr, pc, (uptr)c, kSizeLog1);
1129  int res = REAL(pthread_cond_broadcast)(c);
1130  return res;
1131}
1132
1133TSAN_INTERCEPTOR(int, pthread_cond_wait, void *c, void *m) {
1134  SCOPED_TSAN_INTERCEPTOR(pthread_cond_wait, c, m);
1135  MutexUnlock(thr, pc, (uptr)m);
1136  MemoryRead(thr, pc, (uptr)c, kSizeLog1);
1137  int res = REAL(pthread_cond_wait)(c, m);
1138  MutexLock(thr, pc, (uptr)m);
1139  return res;
1140}
1141
1142TSAN_INTERCEPTOR(int, pthread_cond_timedwait, void *c, void *m,
1143    void *abstime) {
1144  SCOPED_TSAN_INTERCEPTOR(pthread_cond_timedwait, c, m, abstime);
1145  MutexUnlock(thr, pc, (uptr)m);
1146  MemoryRead(thr, pc, (uptr)c, kSizeLog1);
1147  int res = REAL(pthread_cond_timedwait)(c, m, abstime);
1148  MutexLock(thr, pc, (uptr)m);
1149  return res;
1150}
1151
1152TSAN_INTERCEPTOR(int, pthread_barrier_init, void *b, void *a, unsigned count) {
1153  SCOPED_TSAN_INTERCEPTOR(pthread_barrier_init, b, a, count);
1154  MemoryWrite(thr, pc, (uptr)b, kSizeLog1);
1155  int res = REAL(pthread_barrier_init)(b, a, count);
1156  return res;
1157}
1158
1159TSAN_INTERCEPTOR(int, pthread_barrier_destroy, void *b) {
1160  SCOPED_TSAN_INTERCEPTOR(pthread_barrier_destroy, b);
1161  MemoryWrite(thr, pc, (uptr)b, kSizeLog1);
1162  int res = REAL(pthread_barrier_destroy)(b);
1163  return res;
1164}
1165
1166TSAN_INTERCEPTOR(int, pthread_barrier_wait, void *b) {
1167  SCOPED_TSAN_INTERCEPTOR(pthread_barrier_wait, b);
1168  Release(thr, pc, (uptr)b);
1169  MemoryRead(thr, pc, (uptr)b, kSizeLog1);
1170  int res = REAL(pthread_barrier_wait)(b);
1171  MemoryRead(thr, pc, (uptr)b, kSizeLog1);
1172  if (res == 0 || res == PTHREAD_BARRIER_SERIAL_THREAD) {
1173    Acquire(thr, pc, (uptr)b);
1174  }
1175  return res;
1176}
1177
1178TSAN_INTERCEPTOR(int, pthread_once, void *o, void (*f)()) {
1179  SCOPED_INTERCEPTOR_RAW(pthread_once, o, f);
1180  // Using SCOPED_INTERCEPTOR_RAW, because if we are called from an ignored lib,
1181  // the user callback must be executed with thr->in_rtl == 0.
1182  if (o == 0 || f == 0)
1183    return EINVAL;
1184  atomic_uint32_t *a = static_cast<atomic_uint32_t*>(o);
1185  u32 v = atomic_load(a, memory_order_acquire);
1186  if (v == 0 && atomic_compare_exchange_strong(a, &v, 1,
1187                                               memory_order_relaxed)) {
1188    const int old_in_rtl = thr->in_rtl;
1189    thr->in_rtl = 0;
1190    (*f)();
1191    CHECK_EQ(thr->in_rtl, 0);
1192    thr->in_rtl = old_in_rtl;
1193    if (!thr->in_ignored_lib)
1194      Release(thr, pc, (uptr)o);
1195    atomic_store(a, 2, memory_order_release);
1196  } else {
1197    while (v != 2) {
1198      pthread_yield();
1199      v = atomic_load(a, memory_order_acquire);
1200    }
1201    if (!thr->in_ignored_lib)
1202      Acquire(thr, pc, (uptr)o);
1203  }
1204  return 0;
1205}
1206
1207TSAN_INTERCEPTOR(int, sem_init, void *s, int pshared, unsigned value) {
1208  SCOPED_TSAN_INTERCEPTOR(sem_init, s, pshared, value);
1209  int res = REAL(sem_init)(s, pshared, value);
1210  return res;
1211}
1212
1213TSAN_INTERCEPTOR(int, sem_destroy, void *s) {
1214  SCOPED_TSAN_INTERCEPTOR(sem_destroy, s);
1215  int res = REAL(sem_destroy)(s);
1216  return res;
1217}
1218
1219TSAN_INTERCEPTOR(int, sem_wait, void *s) {
1220  SCOPED_TSAN_INTERCEPTOR(sem_wait, s);
1221  int res = BLOCK_REAL(sem_wait)(s);
1222  if (res == 0) {
1223    Acquire(thr, pc, (uptr)s);
1224  }
1225  return res;
1226}
1227
1228TSAN_INTERCEPTOR(int, sem_trywait, void *s) {
1229  SCOPED_TSAN_INTERCEPTOR(sem_trywait, s);
1230  int res = BLOCK_REAL(sem_trywait)(s);
1231  if (res == 0) {
1232    Acquire(thr, pc, (uptr)s);
1233  }
1234  return res;
1235}
1236
1237TSAN_INTERCEPTOR(int, sem_timedwait, void *s, void *abstime) {
1238  SCOPED_TSAN_INTERCEPTOR(sem_timedwait, s, abstime);
1239  int res = BLOCK_REAL(sem_timedwait)(s, abstime);
1240  if (res == 0) {
1241    Acquire(thr, pc, (uptr)s);
1242  }
1243  return res;
1244}
1245
1246TSAN_INTERCEPTOR(int, sem_post, void *s) {
1247  SCOPED_TSAN_INTERCEPTOR(sem_post, s);
1248  Release(thr, pc, (uptr)s);
1249  int res = REAL(sem_post)(s);
1250  return res;
1251}
1252
1253TSAN_INTERCEPTOR(int, sem_getvalue, void *s, int *sval) {
1254  SCOPED_TSAN_INTERCEPTOR(sem_getvalue, s, sval);
1255  int res = REAL(sem_getvalue)(s, sval);
1256  if (res == 0) {
1257    Acquire(thr, pc, (uptr)s);
1258  }
1259  return res;
1260}
1261
1262TSAN_INTERCEPTOR(int, __xstat, int version, const char *path, void *buf) {
1263  SCOPED_TSAN_INTERCEPTOR(__xstat, version, path, buf);
1264  return REAL(__xstat)(version, path, buf);
1265}
1266
1267TSAN_INTERCEPTOR(int, stat, const char *path, void *buf) {
1268  SCOPED_TSAN_INTERCEPTOR(__xstat, 0, path, buf);
1269  return REAL(__xstat)(0, path, buf);
1270}
1271
1272TSAN_INTERCEPTOR(int, __xstat64, int version, const char *path, void *buf) {
1273  SCOPED_TSAN_INTERCEPTOR(__xstat64, version, path, buf);
1274  return REAL(__xstat64)(version, path, buf);
1275}
1276
1277TSAN_INTERCEPTOR(int, stat64, const char *path, void *buf) {
1278  SCOPED_TSAN_INTERCEPTOR(__xstat64, 0, path, buf);
1279  return REAL(__xstat64)(0, path, buf);
1280}
1281
1282TSAN_INTERCEPTOR(int, __lxstat, int version, const char *path, void *buf) {
1283  SCOPED_TSAN_INTERCEPTOR(__lxstat, version, path, buf);
1284  return REAL(__lxstat)(version, path, buf);
1285}
1286
1287TSAN_INTERCEPTOR(int, lstat, const char *path, void *buf) {
1288  SCOPED_TSAN_INTERCEPTOR(__lxstat, 0, path, buf);
1289  return REAL(__lxstat)(0, path, buf);
1290}
1291
1292TSAN_INTERCEPTOR(int, __lxstat64, int version, const char *path, void *buf) {
1293  SCOPED_TSAN_INTERCEPTOR(__lxstat64, version, path, buf);
1294  return REAL(__lxstat64)(version, path, buf);
1295}
1296
1297TSAN_INTERCEPTOR(int, lstat64, const char *path, void *buf) {
1298  SCOPED_TSAN_INTERCEPTOR(__lxstat64, 0, path, buf);
1299  return REAL(__lxstat64)(0, path, buf);
1300}
1301
1302TSAN_INTERCEPTOR(int, __fxstat, int version, int fd, void *buf) {
1303  SCOPED_TSAN_INTERCEPTOR(__fxstat, version, fd, buf);
1304  if (fd > 0)
1305    FdAccess(thr, pc, fd);
1306  return REAL(__fxstat)(version, fd, buf);
1307}
1308
1309TSAN_INTERCEPTOR(int, fstat, int fd, void *buf) {
1310  SCOPED_TSAN_INTERCEPTOR(__fxstat, 0, fd, buf);
1311  if (fd > 0)
1312    FdAccess(thr, pc, fd);
1313  return REAL(__fxstat)(0, fd, buf);
1314}
1315
1316TSAN_INTERCEPTOR(int, __fxstat64, int version, int fd, void *buf) {
1317  SCOPED_TSAN_INTERCEPTOR(__fxstat64, version, fd, buf);
1318  if (fd > 0)
1319    FdAccess(thr, pc, fd);
1320  return REAL(__fxstat64)(version, fd, buf);
1321}
1322
1323TSAN_INTERCEPTOR(int, fstat64, int fd, void *buf) {
1324  SCOPED_TSAN_INTERCEPTOR(__fxstat64, 0, fd, buf);
1325  if (fd > 0)
1326    FdAccess(thr, pc, fd);
1327  return REAL(__fxstat64)(0, fd, buf);
1328}
1329
1330TSAN_INTERCEPTOR(int, open, const char *name, int flags, int mode) {
1331  SCOPED_TSAN_INTERCEPTOR(open, name, flags, mode);
1332  int fd = REAL(open)(name, flags, mode);
1333  if (fd >= 0)
1334    FdFileCreate(thr, pc, fd);
1335  return fd;
1336}
1337
1338TSAN_INTERCEPTOR(int, open64, const char *name, int flags, int mode) {
1339  SCOPED_TSAN_INTERCEPTOR(open64, name, flags, mode);
1340  int fd = REAL(open64)(name, flags, mode);
1341  if (fd >= 0)
1342    FdFileCreate(thr, pc, fd);
1343  return fd;
1344}
1345
1346TSAN_INTERCEPTOR(int, creat, const char *name, int mode) {
1347  SCOPED_TSAN_INTERCEPTOR(creat, name, mode);
1348  int fd = REAL(creat)(name, mode);
1349  if (fd >= 0)
1350    FdFileCreate(thr, pc, fd);
1351  return fd;
1352}
1353
1354TSAN_INTERCEPTOR(int, creat64, const char *name, int mode) {
1355  SCOPED_TSAN_INTERCEPTOR(creat64, name, mode);
1356  int fd = REAL(creat64)(name, mode);
1357  if (fd >= 0)
1358    FdFileCreate(thr, pc, fd);
1359  return fd;
1360}
1361
1362TSAN_INTERCEPTOR(int, dup, int oldfd) {
1363  SCOPED_TSAN_INTERCEPTOR(dup, oldfd);
1364  int newfd = REAL(dup)(oldfd);
1365  if (oldfd >= 0 && newfd >= 0 && newfd != oldfd)
1366    FdDup(thr, pc, oldfd, newfd);
1367  return newfd;
1368}
1369
1370TSAN_INTERCEPTOR(int, dup2, int oldfd, int newfd) {
1371  SCOPED_TSAN_INTERCEPTOR(dup2, oldfd, newfd);
1372  int newfd2 = REAL(dup2)(oldfd, newfd);
1373  if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
1374    FdDup(thr, pc, oldfd, newfd2);
1375  return newfd2;
1376}
1377
1378TSAN_INTERCEPTOR(int, dup3, int oldfd, int newfd, int flags) {
1379  SCOPED_TSAN_INTERCEPTOR(dup3, oldfd, newfd, flags);
1380  int newfd2 = REAL(dup3)(oldfd, newfd, flags);
1381  if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
1382    FdDup(thr, pc, oldfd, newfd2);
1383  return newfd2;
1384}
1385
1386TSAN_INTERCEPTOR(int, eventfd, unsigned initval, int flags) {
1387  SCOPED_TSAN_INTERCEPTOR(eventfd, initval, flags);
1388  int fd = REAL(eventfd)(initval, flags);
1389  if (fd >= 0)
1390    FdEventCreate(thr, pc, fd);
1391  return fd;
1392}
1393
1394TSAN_INTERCEPTOR(int, signalfd, int fd, void *mask, int flags) {
1395  SCOPED_TSAN_INTERCEPTOR(signalfd, fd, mask, flags);
1396  if (fd >= 0)
1397    FdClose(thr, pc, fd);
1398  fd = REAL(signalfd)(fd, mask, flags);
1399  if (fd >= 0)
1400    FdSignalCreate(thr, pc, fd);
1401  return fd;
1402}
1403
1404TSAN_INTERCEPTOR(int, inotify_init, int fake) {
1405  SCOPED_TSAN_INTERCEPTOR(inotify_init, fake);
1406  int fd = REAL(inotify_init)(fake);
1407  if (fd >= 0)
1408    FdInotifyCreate(thr, pc, fd);
1409  return fd;
1410}
1411
1412TSAN_INTERCEPTOR(int, inotify_init1, int flags) {
1413  SCOPED_TSAN_INTERCEPTOR(inotify_init1, flags);
1414  int fd = REAL(inotify_init1)(flags);
1415  if (fd >= 0)
1416    FdInotifyCreate(thr, pc, fd);
1417  return fd;
1418}
1419
1420TSAN_INTERCEPTOR(int, socket, int domain, int type, int protocol) {
1421  SCOPED_TSAN_INTERCEPTOR(socket, domain, type, protocol);
1422  int fd = REAL(socket)(domain, type, protocol);
1423  if (fd >= 0)
1424    FdSocketCreate(thr, pc, fd);
1425  return fd;
1426}
1427
1428TSAN_INTERCEPTOR(int, socketpair, int domain, int type, int protocol, int *fd) {
1429  SCOPED_TSAN_INTERCEPTOR(socketpair, domain, type, protocol, fd);
1430  int res = REAL(socketpair)(domain, type, protocol, fd);
1431  if (res == 0 && fd[0] >= 0 && fd[1] >= 0)
1432    FdPipeCreate(thr, pc, fd[0], fd[1]);
1433  return res;
1434}
1435
1436TSAN_INTERCEPTOR(int, connect, int fd, void *addr, unsigned addrlen) {
1437  SCOPED_TSAN_INTERCEPTOR(connect, fd, addr, addrlen);
1438  FdSocketConnecting(thr, pc, fd);
1439  int res = REAL(connect)(fd, addr, addrlen);
1440  if (res == 0 && fd >= 0)
1441    FdSocketConnect(thr, pc, fd);
1442  return res;
1443}
1444
1445TSAN_INTERCEPTOR(int, bind, int fd, void *addr, unsigned addrlen) {
1446  SCOPED_TSAN_INTERCEPTOR(bind, fd, addr, addrlen);
1447  int res = REAL(bind)(fd, addr, addrlen);
1448  if (fd > 0 && res == 0)
1449    FdAccess(thr, pc, fd);
1450  return res;
1451}
1452
1453TSAN_INTERCEPTOR(int, listen, int fd, int backlog) {
1454  SCOPED_TSAN_INTERCEPTOR(listen, fd, backlog);
1455  int res = REAL(listen)(fd, backlog);
1456  if (fd > 0 && res == 0)
1457    FdAccess(thr, pc, fd);
1458  return res;
1459}
1460
1461TSAN_INTERCEPTOR(int, epoll_create, int size) {
1462  SCOPED_TSAN_INTERCEPTOR(epoll_create, size);
1463  int fd = REAL(epoll_create)(size);
1464  if (fd >= 0)
1465    FdPollCreate(thr, pc, fd);
1466  return fd;
1467}
1468
1469TSAN_INTERCEPTOR(int, epoll_create1, int flags) {
1470  SCOPED_TSAN_INTERCEPTOR(epoll_create1, flags);
1471  int fd = REAL(epoll_create1)(flags);
1472  if (fd >= 0)
1473    FdPollCreate(thr, pc, fd);
1474  return fd;
1475}
1476
1477TSAN_INTERCEPTOR(int, close, int fd) {
1478  SCOPED_TSAN_INTERCEPTOR(close, fd);
1479  if (fd >= 0)
1480    FdClose(thr, pc, fd);
1481  return REAL(close)(fd);
1482}
1483
1484TSAN_INTERCEPTOR(int, __close, int fd) {
1485  SCOPED_TSAN_INTERCEPTOR(__close, fd);
1486  if (fd >= 0)
1487    FdClose(thr, pc, fd);
1488  return REAL(__close)(fd);
1489}
1490
1491// glibc guts
1492TSAN_INTERCEPTOR(void, __res_iclose, void *state, bool free_addr) {
1493  SCOPED_TSAN_INTERCEPTOR(__res_iclose, state, free_addr);
1494  int fds[64];
1495  int cnt = ExtractResolvFDs(state, fds, ARRAY_SIZE(fds));
1496  for (int i = 0; i < cnt; i++) {
1497    if (fds[i] > 0)
1498      FdClose(thr, pc, fds[i]);
1499  }
1500  REAL(__res_iclose)(state, free_addr);
1501}
1502
1503TSAN_INTERCEPTOR(int, pipe, int *pipefd) {
1504  SCOPED_TSAN_INTERCEPTOR(pipe, pipefd);
1505  int res = REAL(pipe)(pipefd);
1506  if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
1507    FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
1508  return res;
1509}
1510
1511TSAN_INTERCEPTOR(int, pipe2, int *pipefd, int flags) {
1512  SCOPED_TSAN_INTERCEPTOR(pipe2, pipefd, flags);
1513  int res = REAL(pipe2)(pipefd, flags);
1514  if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
1515    FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
1516  return res;
1517}
1518
1519TSAN_INTERCEPTOR(long_t, send, int fd, void *buf, long_t len, int flags) {
1520  SCOPED_TSAN_INTERCEPTOR(send, fd, buf, len, flags);
1521  if (fd >= 0) {
1522    FdAccess(thr, pc, fd);
1523    FdRelease(thr, pc, fd);
1524  }
1525  int res = REAL(send)(fd, buf, len, flags);
1526  return res;
1527}
1528
1529TSAN_INTERCEPTOR(long_t, sendmsg, int fd, void *msg, int flags) {
1530  SCOPED_TSAN_INTERCEPTOR(sendmsg, fd, msg, flags);
1531  if (fd >= 0) {
1532    FdAccess(thr, pc, fd);
1533    FdRelease(thr, pc, fd);
1534  }
1535  int res = REAL(sendmsg)(fd, msg, flags);
1536  return res;
1537}
1538
1539TSAN_INTERCEPTOR(long_t, recv, int fd, void *buf, long_t len, int flags) {
1540  SCOPED_TSAN_INTERCEPTOR(recv, fd, buf, len, flags);
1541  if (fd >= 0)
1542    FdAccess(thr, pc, fd);
1543  int res = REAL(recv)(fd, buf, len, flags);
1544  if (res >= 0 && fd >= 0) {
1545    FdAcquire(thr, pc, fd);
1546  }
1547  return res;
1548}
1549
1550TSAN_INTERCEPTOR(int, unlink, char *path) {
1551  SCOPED_TSAN_INTERCEPTOR(unlink, path);
1552  Release(thr, pc, File2addr(path));
1553  int res = REAL(unlink)(path);
1554  return res;
1555}
1556
1557TSAN_INTERCEPTOR(void*, fopen, char *path, char *mode) {
1558  SCOPED_TSAN_INTERCEPTOR(fopen, path, mode);
1559  void *res = REAL(fopen)(path, mode);
1560  Acquire(thr, pc, File2addr(path));
1561  if (res) {
1562    int fd = fileno_unlocked(res);
1563    if (fd >= 0)
1564      FdFileCreate(thr, pc, fd);
1565  }
1566  return res;
1567}
1568
1569TSAN_INTERCEPTOR(void*, freopen, char *path, char *mode, void *stream) {
1570  SCOPED_TSAN_INTERCEPTOR(freopen, path, mode, stream);
1571  if (stream) {
1572    int fd = fileno_unlocked(stream);
1573    if (fd >= 0)
1574      FdClose(thr, pc, fd);
1575  }
1576  void *res = REAL(freopen)(path, mode, stream);
1577  Acquire(thr, pc, File2addr(path));
1578  if (res) {
1579    int fd = fileno_unlocked(res);
1580    if (fd >= 0)
1581      FdFileCreate(thr, pc, fd);
1582  }
1583  return res;
1584}
1585
1586TSAN_INTERCEPTOR(int, fclose, void *stream) {
1587  {
1588    SCOPED_TSAN_INTERCEPTOR(fclose, stream);
1589    if (stream) {
1590      int fd = fileno_unlocked(stream);
1591      if (fd >= 0)
1592        FdClose(thr, pc, fd);
1593    }
1594  }
1595  return REAL(fclose)(stream);
1596}
1597
1598TSAN_INTERCEPTOR(uptr, fread, void *ptr, uptr size, uptr nmemb, void *f) {
1599  {
1600    SCOPED_TSAN_INTERCEPTOR(fread, ptr, size, nmemb, f);
1601    MemoryAccessRange(thr, pc, (uptr)ptr, size * nmemb, true);
1602  }
1603  return REAL(fread)(ptr, size, nmemb, f);
1604}
1605
1606TSAN_INTERCEPTOR(uptr, fwrite, const void *p, uptr size, uptr nmemb, void *f) {
1607  {
1608    SCOPED_TSAN_INTERCEPTOR(fwrite, p, size, nmemb, f);
1609    MemoryAccessRange(thr, pc, (uptr)p, size * nmemb, false);
1610  }
1611  return REAL(fwrite)(p, size, nmemb, f);
1612}
1613
1614TSAN_INTERCEPTOR(int, fflush, void *stream) {
1615  SCOPED_TSAN_INTERCEPTOR(fflush, stream);
1616  return REAL(fflush)(stream);
1617}
1618
1619TSAN_INTERCEPTOR(void, abort, int fake) {
1620  SCOPED_TSAN_INTERCEPTOR(abort, fake);
1621  REAL(fflush)(0);
1622  REAL(abort)(fake);
1623}
1624
1625TSAN_INTERCEPTOR(int, puts, const char *s) {
1626  SCOPED_TSAN_INTERCEPTOR(puts, s);
1627  MemoryAccessRange(thr, pc, (uptr)s, internal_strlen(s), false);
1628  return REAL(puts)(s);
1629}
1630
1631TSAN_INTERCEPTOR(int, rmdir, char *path) {
1632  SCOPED_TSAN_INTERCEPTOR(rmdir, path);
1633  Release(thr, pc, Dir2addr(path));
1634  int res = REAL(rmdir)(path);
1635  return res;
1636}
1637
1638TSAN_INTERCEPTOR(void*, opendir, char *path) {
1639  SCOPED_TSAN_INTERCEPTOR(opendir, path);
1640  void *res = REAL(opendir)(path);
1641  if (res != 0)
1642    Acquire(thr, pc, Dir2addr(path));
1643  return res;
1644}
1645
1646TSAN_INTERCEPTOR(int, epoll_ctl, int epfd, int op, int fd, void *ev) {
1647  SCOPED_TSAN_INTERCEPTOR(epoll_ctl, epfd, op, fd, ev);
1648  if (epfd >= 0)
1649    FdAccess(thr, pc, epfd);
1650  if (epfd >= 0 && fd >= 0)
1651    FdAccess(thr, pc, fd);
1652  if (op == EPOLL_CTL_ADD && epfd >= 0)
1653    FdRelease(thr, pc, epfd);
1654  int res = REAL(epoll_ctl)(epfd, op, fd, ev);
1655  return res;
1656}
1657
1658TSAN_INTERCEPTOR(int, epoll_wait, int epfd, void *ev, int cnt, int timeout) {
1659  SCOPED_TSAN_INTERCEPTOR(epoll_wait, epfd, ev, cnt, timeout);
1660  if (epfd >= 0)
1661    FdAccess(thr, pc, epfd);
1662  int res = BLOCK_REAL(epoll_wait)(epfd, ev, cnt, timeout);
1663  if (res > 0 && epfd >= 0)
1664    FdAcquire(thr, pc, epfd);
1665  return res;
1666}
1667
1668void ALWAYS_INLINE rtl_generic_sighandler(bool sigact, int sig,
1669    my_siginfo_t *info, void *ctx) {
1670  ThreadState *thr = cur_thread();
1671  SignalContext *sctx = SigCtx(thr);
1672  // Don't mess with synchronous signals.
1673  if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
1674      sig == SIGABRT || sig == SIGFPE || sig == SIGPIPE || sig == SIGSYS ||
1675      // If we are sending signal to ourselves, we must process it now.
1676      (sctx && sig == sctx->int_signal_send) ||
1677      // If we are in blocking function, we can safely process it now
1678      // (but check if we are in a recursive interceptor,
1679      // i.e. pthread_join()->munmap()).
1680      (sctx && sctx->in_blocking_func == 1 && thr->in_rtl == 1)) {
1681    int in_rtl = thr->in_rtl;
1682    thr->in_rtl = 0;
1683    CHECK_EQ(thr->in_signal_handler, false);
1684    thr->in_signal_handler = true;
1685    if (sigact)
1686      sigactions[sig].sa_sigaction(sig, info, ctx);
1687    else
1688      sigactions[sig].sa_handler(sig);
1689    CHECK_EQ(thr->in_signal_handler, true);
1690    thr->in_signal_handler = false;
1691    thr->in_rtl = in_rtl;
1692    return;
1693  }
1694
1695  if (sctx == 0)
1696    return;
1697  SignalDesc *signal = &sctx->pending_signals[sig];
1698  if (signal->armed == false) {
1699    signal->armed = true;
1700    signal->sigaction = sigact;
1701    if (info)
1702      internal_memcpy(&signal->siginfo, info, sizeof(*info));
1703    if (ctx)
1704      internal_memcpy(&signal->ctx, ctx, sizeof(signal->ctx));
1705    sctx->pending_signal_count++;
1706  }
1707}
1708
1709static void rtl_sighandler(int sig) {
1710  rtl_generic_sighandler(false, sig, 0, 0);
1711}
1712
1713static void rtl_sigaction(int sig, my_siginfo_t *info, void *ctx) {
1714  rtl_generic_sighandler(true, sig, info, ctx);
1715}
1716
1717TSAN_INTERCEPTOR(int, sigaction, int sig, sigaction_t *act, sigaction_t *old) {
1718  SCOPED_TSAN_INTERCEPTOR(sigaction, sig, act, old);
1719  if (old)
1720    internal_memcpy(old, &sigactions[sig], sizeof(*old));
1721  if (act == 0)
1722    return 0;
1723  internal_memcpy(&sigactions[sig], act, sizeof(*act));
1724  sigaction_t newact;
1725  internal_memcpy(&newact, act, sizeof(newact));
1726  REAL(sigfillset)(&newact.sa_mask);
1727  if (act->sa_handler != SIG_IGN && act->sa_handler != SIG_DFL) {
1728    if (newact.sa_flags & SA_SIGINFO)
1729      newact.sa_sigaction = rtl_sigaction;
1730    else
1731      newact.sa_handler = rtl_sighandler;
1732  }
1733  int res = REAL(sigaction)(sig, &newact, 0);
1734  return res;
1735}
1736
1737TSAN_INTERCEPTOR(sighandler_t, signal, int sig, sighandler_t h) {
1738  sigaction_t act;
1739  act.sa_handler = h;
1740  REAL(memset)(&act.sa_mask, -1, sizeof(act.sa_mask));
1741  act.sa_flags = 0;
1742  sigaction_t old;
1743  int res = sigaction(sig, &act, &old);
1744  if (res)
1745    return SIG_ERR;
1746  return old.sa_handler;
1747}
1748
1749TSAN_INTERCEPTOR(int, sigsuspend, const __sanitizer_sigset_t *mask) {
1750  SCOPED_TSAN_INTERCEPTOR(sigsuspend, mask);
1751  return REAL(sigsuspend)(mask);
1752}
1753
1754TSAN_INTERCEPTOR(int, raise, int sig) {
1755  SCOPED_TSAN_INTERCEPTOR(raise, sig);
1756  SignalContext *sctx = SigCtx(thr);
1757  CHECK_NE(sctx, 0);
1758  int prev = sctx->int_signal_send;
1759  sctx->int_signal_send = sig;
1760  int res = REAL(raise)(sig);
1761  CHECK_EQ(sctx->int_signal_send, sig);
1762  sctx->int_signal_send = prev;
1763  return res;
1764}
1765
1766TSAN_INTERCEPTOR(int, kill, int pid, int sig) {
1767  SCOPED_TSAN_INTERCEPTOR(kill, pid, sig);
1768  SignalContext *sctx = SigCtx(thr);
1769  CHECK_NE(sctx, 0);
1770  int prev = sctx->int_signal_send;
1771  if (pid == (int)internal_getpid()) {
1772    sctx->int_signal_send = sig;
1773  }
1774  int res = REAL(kill)(pid, sig);
1775  if (pid == (int)internal_getpid()) {
1776    CHECK_EQ(sctx->int_signal_send, sig);
1777    sctx->int_signal_send = prev;
1778  }
1779  return res;
1780}
1781
1782TSAN_INTERCEPTOR(int, pthread_kill, void *tid, int sig) {
1783  SCOPED_TSAN_INTERCEPTOR(pthread_kill, tid, sig);
1784  SignalContext *sctx = SigCtx(thr);
1785  CHECK_NE(sctx, 0);
1786  int prev = sctx->int_signal_send;
1787  if (tid == pthread_self()) {
1788    sctx->int_signal_send = sig;
1789  }
1790  int res = REAL(pthread_kill)(tid, sig);
1791  if (tid == pthread_self()) {
1792    CHECK_EQ(sctx->int_signal_send, sig);
1793    sctx->int_signal_send = prev;
1794  }
1795  return res;
1796}
1797
1798TSAN_INTERCEPTOR(int, gettimeofday, void *tv, void *tz) {
1799  SCOPED_TSAN_INTERCEPTOR(gettimeofday, tv, tz);
1800  // It's intercepted merely to process pending signals.
1801  return REAL(gettimeofday)(tv, tz);
1802}
1803
1804TSAN_INTERCEPTOR(int, getaddrinfo, void *node, void *service,
1805    void *hints, void *rv) {
1806  SCOPED_TSAN_INTERCEPTOR(getaddrinfo, node, service, hints, rv);
1807  // We miss atomic synchronization in getaddrinfo,
1808  // and can report false race between malloc and free
1809  // inside of getaddrinfo. So ignore memory accesses.
1810  ThreadIgnoreBegin(thr);
1811  // getaddrinfo calls fopen, which can be intercepted by user.
1812  thr->in_rtl--;
1813  CHECK_EQ(thr->in_rtl, 0);
1814  int res = REAL(getaddrinfo)(node, service, hints, rv);
1815  thr->in_rtl++;
1816  ThreadIgnoreEnd(thr);
1817  return res;
1818}
1819
1820// Linux kernel has a bug that leads to kernel deadlock if a process
1821// maps TBs of memory and then calls mlock().
1822static void MlockIsUnsupported() {
1823  static atomic_uint8_t printed;
1824  if (atomic_exchange(&printed, 1, memory_order_relaxed))
1825    return;
1826  if (flags()->verbosity > 0)
1827    Printf("INFO: ThreadSanitizer ignores mlock/mlockall/munlock/munlockall\n");
1828}
1829
1830TSAN_INTERCEPTOR(int, mlock, const void *addr, uptr len) {
1831  MlockIsUnsupported();
1832  return 0;
1833}
1834
1835TSAN_INTERCEPTOR(int, munlock, const void *addr, uptr len) {
1836  MlockIsUnsupported();
1837  return 0;
1838}
1839
1840TSAN_INTERCEPTOR(int, mlockall, int flags) {
1841  MlockIsUnsupported();
1842  return 0;
1843}
1844
1845TSAN_INTERCEPTOR(int, munlockall, void) {
1846  MlockIsUnsupported();
1847  return 0;
1848}
1849
1850TSAN_INTERCEPTOR(int, fork, int fake) {
1851  SCOPED_INTERCEPTOR_RAW(fork, fake);
1852  int pid = REAL(fork)(fake);
1853  if (pid == 0) {
1854    // child
1855    FdOnFork(thr, pc);
1856  } else if (pid > 0) {
1857    // parent
1858  }
1859  return pid;
1860}
1861
1862static int OnExit(ThreadState *thr) {
1863  int status = Finalize(thr);
1864  REAL(fflush)(0);
1865  return status;
1866}
1867
1868struct TsanInterceptorContext {
1869  ThreadState *thr;
1870  const uptr caller_pc;
1871  const uptr pc;
1872};
1873
1874#include "sanitizer_common/sanitizer_platform_interceptors.h"
1875// Causes interceptor recursion (getpwuid_r() calls fopen())
1876#undef SANITIZER_INTERCEPT_GETPWNAM_AND_FRIENDS
1877#undef SANITIZER_INTERCEPT_GETPWNAM_R_AND_FRIENDS
1878// Causes interceptor recursion (getaddrinfo() and fopen())
1879#undef SANITIZER_INTERCEPT_GETADDRINFO
1880#undef SANITIZER_INTERCEPT_GETNAMEINFO
1881// Causes interceptor recursion (glob64() calls lstat64())
1882#undef SANITIZER_INTERCEPT_GLOB
1883
1884#define COMMON_INTERCEPTOR_UNPOISON_PARAM(ctx, count) \
1885  do {                                                \
1886  } while (false)
1887#define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size)                    \
1888  MemoryAccessRange(((TsanInterceptorContext *)ctx)->thr,                 \
1889                    ((TsanInterceptorContext *)ctx)->pc, (uptr)ptr, size, \
1890                    true)
1891#define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size)                       \
1892  MemoryAccessRange(((TsanInterceptorContext *) ctx)->thr,                  \
1893                    ((TsanInterceptorContext *) ctx)->pc, (uptr) ptr, size, \
1894                    false)
1895#define COMMON_INTERCEPTOR_ENTER(ctx, func, ...)      \
1896  SCOPED_TSAN_INTERCEPTOR(func, __VA_ARGS__);         \
1897  TsanInterceptorContext _ctx = {thr, caller_pc, pc}; \
1898  ctx = (void *)&_ctx;                                \
1899  (void) ctx;
1900#define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \
1901  FdAcquire(((TsanInterceptorContext *) ctx)->thr, pc, fd)
1902#define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \
1903  FdRelease(((TsanInterceptorContext *) ctx)->thr, pc, fd)
1904#define COMMON_INTERCEPTOR_FD_ACCESS(ctx, fd) \
1905  FdAccess(((TsanInterceptorContext *) ctx)->thr, pc, fd)
1906#define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd) \
1907  FdSocketAccept(((TsanInterceptorContext *) ctx)->thr, pc, fd, newfd)
1908#define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) \
1909  ThreadSetName(((TsanInterceptorContext *) ctx)->thr, name)
1910#define COMMON_INTERCEPTOR_BLOCK_REAL(name) BLOCK_REAL(name)
1911#define COMMON_INTERCEPTOR_ON_EXIT(ctx) \
1912  OnExit(((TsanInterceptorContext *) ctx)->thr)
1913#include "sanitizer_common/sanitizer_common_interceptors.inc"
1914
1915#define TSAN_SYSCALL() \
1916  ThreadState *thr = cur_thread(); \
1917  ScopedSyscall scoped_syscall(thr) \
1918/**/
1919
1920struct ScopedSyscall {
1921  ThreadState *thr;
1922
1923  explicit ScopedSyscall(ThreadState *thr)
1924      : thr(thr) {
1925    if (thr->in_rtl == 0)
1926      Initialize(thr);
1927    thr->in_rtl++;
1928  }
1929
1930  ~ScopedSyscall() {
1931    thr->in_rtl--;
1932    if (thr->in_rtl == 0)
1933      ProcessPendingSignals(thr);
1934  }
1935};
1936
1937static void syscall_access_range(uptr pc, uptr p, uptr s, bool write) {
1938  TSAN_SYSCALL();
1939  MemoryAccessRange(thr, pc, p, s, write);
1940}
1941
1942static void syscall_fd_close(uptr pc, int fd) {
1943  TSAN_SYSCALL();
1944  if (fd >= 0)
1945    FdClose(thr, pc, fd);
1946}
1947
1948static void syscall_pre_fork(uptr pc) {
1949  TSAN_SYSCALL();
1950}
1951
1952static void syscall_post_fork(uptr pc, int res) {
1953  TSAN_SYSCALL();
1954  if (res == 0) {
1955    // child
1956    FdOnFork(thr, pc);
1957  } else if (res > 0) {
1958    // parent
1959  }
1960}
1961
1962#define COMMON_SYSCALL_PRE_READ_RANGE(p, s) \
1963  syscall_access_range(GET_CALLER_PC(), (uptr)(p), (uptr)(s), false)
1964#define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) \
1965  syscall_access_range(GET_CALLER_PC(), (uptr)(p), (uptr)(s), true)
1966#define COMMON_SYSCALL_POST_READ_RANGE(p, s) \
1967  do { } while (false)
1968#define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) \
1969  do { } while (false)
1970#define COMMON_SYSCALL_FD_CLOSE(fd) \
1971  syscall_fd_close(GET_CALLER_PC(), fd)
1972#define COMMON_SYSCALL_PRE_FORK() \
1973  syscall_pre_fork(GET_CALLER_PC())
1974#define COMMON_SYSCALL_POST_FORK(res) \
1975  syscall_post_fork(GET_CALLER_PC(), res)
1976#include "sanitizer_common/sanitizer_common_syscalls.inc"
1977
1978namespace __tsan {
1979
1980static void finalize(void *arg) {
1981  ThreadState *thr = cur_thread();
1982  uptr pc = 0;
1983  atexit_ctx->exit(thr, pc);
1984  int status = Finalize(thr);
1985  REAL(fflush)(0);
1986  if (status)
1987    REAL(_exit)(status);
1988}
1989
1990void ProcessPendingSignals(ThreadState *thr) {
1991  CHECK_EQ(thr->in_rtl, 0);
1992  SignalContext *sctx = SigCtx(thr);
1993  if (sctx == 0 || sctx->pending_signal_count == 0 || thr->in_signal_handler)
1994    return;
1995  Context *ctx = CTX();
1996  thr->in_signal_handler = true;
1997  sctx->pending_signal_count = 0;
1998  // These are too big for stack.
1999  static THREADLOCAL __sanitizer_sigset_t emptyset, oldset;
2000  REAL(sigfillset)(&emptyset);
2001  pthread_sigmask(SIG_SETMASK, &emptyset, &oldset);
2002  for (int sig = 0; sig < kSigCount; sig++) {
2003    SignalDesc *signal = &sctx->pending_signals[sig];
2004    if (signal->armed) {
2005      signal->armed = false;
2006      if (sigactions[sig].sa_handler != SIG_DFL
2007          && sigactions[sig].sa_handler != SIG_IGN) {
2008        // Insure that the handler does not spoil errno.
2009        const int saved_errno = errno;
2010        errno = 0;
2011        if (signal->sigaction)
2012          sigactions[sig].sa_sigaction(sig, &signal->siginfo, &signal->ctx);
2013        else
2014          sigactions[sig].sa_handler(sig);
2015        if (flags()->report_bugs && errno != 0) {
2016          ScopedInRtl in_rtl;
2017          __tsan::StackTrace stack;
2018          uptr pc = signal->sigaction ?
2019              (uptr)sigactions[sig].sa_sigaction :
2020              (uptr)sigactions[sig].sa_handler;
2021          pc += 1;  // return address is expected, OutputReport() will undo this
2022          stack.Init(&pc, 1);
2023          ThreadRegistryLock l(ctx->thread_registry);
2024          ScopedReport rep(ReportTypeErrnoInSignal);
2025          if (!IsFiredSuppression(ctx, rep, stack)) {
2026            rep.AddStack(&stack);
2027            OutputReport(ctx, rep, rep.GetReport()->stacks[0]);
2028          }
2029        }
2030        errno = saved_errno;
2031      }
2032    }
2033  }
2034  pthread_sigmask(SIG_SETMASK, &oldset, 0);
2035  CHECK_EQ(thr->in_signal_handler, true);
2036  thr->in_signal_handler = false;
2037}
2038
2039static void unreachable() {
2040  Printf("FATAL: ThreadSanitizer: unreachable called\n");
2041  Die();
2042}
2043
2044void InitializeInterceptors() {
2045  CHECK_GT(cur_thread()->in_rtl, 0);
2046
2047  // We need to setup it early, because functions like dlsym() can call it.
2048  REAL(memset) = internal_memset;
2049  REAL(memcpy) = internal_memcpy;
2050  REAL(memcmp) = internal_memcmp;
2051
2052  // Instruct libc malloc to consume less memory.
2053  mallopt(1, 0);  // M_MXFAST
2054  mallopt(-3, 32*1024);  // M_MMAP_THRESHOLD
2055
2056  SANITIZER_COMMON_INTERCEPTORS_INIT;
2057
2058  TSAN_INTERCEPT(setjmp);
2059  TSAN_INTERCEPT(_setjmp);
2060  TSAN_INTERCEPT(sigsetjmp);
2061  TSAN_INTERCEPT(__sigsetjmp);
2062  TSAN_INTERCEPT(longjmp);
2063  TSAN_INTERCEPT(siglongjmp);
2064
2065  TSAN_INTERCEPT(malloc);
2066  TSAN_INTERCEPT(__libc_memalign);
2067  TSAN_INTERCEPT(calloc);
2068  TSAN_INTERCEPT(realloc);
2069  TSAN_INTERCEPT(free);
2070  TSAN_INTERCEPT(cfree);
2071  TSAN_INTERCEPT(mmap);
2072  TSAN_INTERCEPT(mmap64);
2073  TSAN_INTERCEPT(munmap);
2074  TSAN_INTERCEPT(memalign);
2075  TSAN_INTERCEPT(valloc);
2076  TSAN_INTERCEPT(pvalloc);
2077  TSAN_INTERCEPT(posix_memalign);
2078
2079  TSAN_INTERCEPT(strlen);
2080  TSAN_INTERCEPT(memset);
2081  TSAN_INTERCEPT(memcpy);
2082  TSAN_INTERCEPT(memchr);
2083  TSAN_INTERCEPT(memrchr);
2084  TSAN_INTERCEPT(memmove);
2085  TSAN_INTERCEPT(memcmp);
2086  TSAN_INTERCEPT(strchr);
2087  TSAN_INTERCEPT(strchrnul);
2088  TSAN_INTERCEPT(strrchr);
2089  TSAN_INTERCEPT(strcpy);  // NOLINT
2090  TSAN_INTERCEPT(strncpy);
2091  TSAN_INTERCEPT(strstr);
2092  TSAN_INTERCEPT(strdup);
2093
2094  TSAN_INTERCEPT(pthread_create);
2095  TSAN_INTERCEPT(pthread_join);
2096  TSAN_INTERCEPT(pthread_detach);
2097
2098  TSAN_INTERCEPT(pthread_mutex_init);
2099  TSAN_INTERCEPT(pthread_mutex_destroy);
2100  TSAN_INTERCEPT(pthread_mutex_lock);
2101  TSAN_INTERCEPT(pthread_mutex_trylock);
2102  TSAN_INTERCEPT(pthread_mutex_timedlock);
2103  TSAN_INTERCEPT(pthread_mutex_unlock);
2104
2105  TSAN_INTERCEPT(pthread_spin_init);
2106  TSAN_INTERCEPT(pthread_spin_destroy);
2107  TSAN_INTERCEPT(pthread_spin_lock);
2108  TSAN_INTERCEPT(pthread_spin_trylock);
2109  TSAN_INTERCEPT(pthread_spin_unlock);
2110
2111  TSAN_INTERCEPT(pthread_rwlock_init);
2112  TSAN_INTERCEPT(pthread_rwlock_destroy);
2113  TSAN_INTERCEPT(pthread_rwlock_rdlock);
2114  TSAN_INTERCEPT(pthread_rwlock_tryrdlock);
2115  TSAN_INTERCEPT(pthread_rwlock_timedrdlock);
2116  TSAN_INTERCEPT(pthread_rwlock_wrlock);
2117  TSAN_INTERCEPT(pthread_rwlock_trywrlock);
2118  TSAN_INTERCEPT(pthread_rwlock_timedwrlock);
2119  TSAN_INTERCEPT(pthread_rwlock_unlock);
2120
2121  INTERCEPT_FUNCTION_VER(pthread_cond_init, GLIBC_2.3.2);
2122  INTERCEPT_FUNCTION_VER(pthread_cond_destroy, GLIBC_2.3.2);
2123  INTERCEPT_FUNCTION_VER(pthread_cond_signal, GLIBC_2.3.2);
2124  INTERCEPT_FUNCTION_VER(pthread_cond_broadcast, GLIBC_2.3.2);
2125  INTERCEPT_FUNCTION_VER(pthread_cond_wait, GLIBC_2.3.2);
2126  INTERCEPT_FUNCTION_VER(pthread_cond_timedwait, GLIBC_2.3.2);
2127
2128  TSAN_INTERCEPT(pthread_barrier_init);
2129  TSAN_INTERCEPT(pthread_barrier_destroy);
2130  TSAN_INTERCEPT(pthread_barrier_wait);
2131
2132  TSAN_INTERCEPT(pthread_once);
2133
2134  TSAN_INTERCEPT(sem_init);
2135  TSAN_INTERCEPT(sem_destroy);
2136  TSAN_INTERCEPT(sem_wait);
2137  TSAN_INTERCEPT(sem_trywait);
2138  TSAN_INTERCEPT(sem_timedwait);
2139  TSAN_INTERCEPT(sem_post);
2140  TSAN_INTERCEPT(sem_getvalue);
2141
2142  TSAN_INTERCEPT(stat);
2143  TSAN_INTERCEPT(__xstat);
2144  TSAN_INTERCEPT(stat64);
2145  TSAN_INTERCEPT(__xstat64);
2146  TSAN_INTERCEPT(lstat);
2147  TSAN_INTERCEPT(__lxstat);
2148  TSAN_INTERCEPT(lstat64);
2149  TSAN_INTERCEPT(__lxstat64);
2150  TSAN_INTERCEPT(fstat);
2151  TSAN_INTERCEPT(__fxstat);
2152  TSAN_INTERCEPT(fstat64);
2153  TSAN_INTERCEPT(__fxstat64);
2154  TSAN_INTERCEPT(open);
2155  TSAN_INTERCEPT(open64);
2156  TSAN_INTERCEPT(creat);
2157  TSAN_INTERCEPT(creat64);
2158  TSAN_INTERCEPT(dup);
2159  TSAN_INTERCEPT(dup2);
2160  TSAN_INTERCEPT(dup3);
2161  TSAN_INTERCEPT(eventfd);
2162  TSAN_INTERCEPT(signalfd);
2163  TSAN_INTERCEPT(inotify_init);
2164  TSAN_INTERCEPT(inotify_init1);
2165  TSAN_INTERCEPT(socket);
2166  TSAN_INTERCEPT(socketpair);
2167  TSAN_INTERCEPT(connect);
2168  TSAN_INTERCEPT(bind);
2169  TSAN_INTERCEPT(listen);
2170  TSAN_INTERCEPT(epoll_create);
2171  TSAN_INTERCEPT(epoll_create1);
2172  TSAN_INTERCEPT(close);
2173  TSAN_INTERCEPT(__close);
2174  TSAN_INTERCEPT(__res_iclose);
2175  TSAN_INTERCEPT(pipe);
2176  TSAN_INTERCEPT(pipe2);
2177
2178  TSAN_INTERCEPT(send);
2179  TSAN_INTERCEPT(sendmsg);
2180  TSAN_INTERCEPT(recv);
2181
2182  TSAN_INTERCEPT(unlink);
2183  TSAN_INTERCEPT(fopen);
2184  TSAN_INTERCEPT(freopen);
2185  TSAN_INTERCEPT(fclose);
2186  TSAN_INTERCEPT(fread);
2187  TSAN_INTERCEPT(fwrite);
2188  TSAN_INTERCEPT(fflush);
2189  TSAN_INTERCEPT(abort);
2190  TSAN_INTERCEPT(puts);
2191  TSAN_INTERCEPT(rmdir);
2192  TSAN_INTERCEPT(opendir);
2193
2194  TSAN_INTERCEPT(epoll_ctl);
2195  TSAN_INTERCEPT(epoll_wait);
2196
2197  TSAN_INTERCEPT(sigaction);
2198  TSAN_INTERCEPT(signal);
2199  TSAN_INTERCEPT(sigsuspend);
2200  TSAN_INTERCEPT(raise);
2201  TSAN_INTERCEPT(kill);
2202  TSAN_INTERCEPT(pthread_kill);
2203  TSAN_INTERCEPT(sleep);
2204  TSAN_INTERCEPT(usleep);
2205  TSAN_INTERCEPT(nanosleep);
2206  TSAN_INTERCEPT(gettimeofday);
2207  TSAN_INTERCEPT(getaddrinfo);
2208
2209  TSAN_INTERCEPT(mlock);
2210  TSAN_INTERCEPT(munlock);
2211  TSAN_INTERCEPT(mlockall);
2212  TSAN_INTERCEPT(munlockall);
2213
2214  TSAN_INTERCEPT(fork);
2215  TSAN_INTERCEPT(dlopen);
2216  TSAN_INTERCEPT(dlclose);
2217  TSAN_INTERCEPT(on_exit);
2218  TSAN_INTERCEPT(__cxa_atexit);
2219  TSAN_INTERCEPT(_exit);
2220
2221  // Need to setup it, because interceptors check that the function is resolved.
2222  // But atexit is emitted directly into the module, so can't be resolved.
2223  REAL(atexit) = (int(*)(void(*)()))unreachable;
2224  atexit_ctx = new(internal_alloc(MBlockAtExit, sizeof(AtExitContext)))
2225      AtExitContext();
2226
2227  if (REAL(__cxa_atexit)(&finalize, 0, 0)) {
2228    Printf("ThreadSanitizer: failed to setup atexit callback\n");
2229    Die();
2230  }
2231
2232  if (pthread_key_create(&g_thread_finalize_key, &thread_finalize)) {
2233    Printf("ThreadSanitizer: failed to create thread key\n");
2234    Die();
2235  }
2236
2237  FdInit();
2238}
2239
2240void internal_start_thread(void(*func)(void *arg), void *arg) {
2241  void *th;
2242  REAL(pthread_create)(&th, 0, (void*(*)(void *arg))func, arg);
2243  REAL(pthread_detach)(th);
2244}
2245
2246}  // namespace __tsan
2247