tsan_interceptors.cc revision 3dbbd850cde5728c35aa4c15a279d858604fc6ee 
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
886#if defined(TSAN_DEBUG_OUTPUT)
887  int verbosity = (TSAN_DEBUG_OUTPUT);
888#else
889  int verbosity = 0;
890#endif
891  AdjustStackSizeLinux(attr, verbosity);
892
893  ThreadParam p;
894  p.callback = callback;
895  p.param = param;
896  atomic_store(&p.tid, 0, memory_order_relaxed);
897  int res = REAL(pthread_create)(th, attr, __tsan_thread_start_func, &p);
898  if (res == 0) {
899    int tid = ThreadCreate(thr, pc, *(uptr*)th, detached);
900    CHECK_NE(tid, 0);
901    atomic_store(&p.tid, tid, memory_order_release);
902    while (atomic_load(&p.tid, memory_order_acquire) != 0)
903      pthread_yield();
904  }
905  if (attr == &myattr)
906    pthread_attr_destroy(&myattr);
907  return res;
908}
909
910TSAN_INTERCEPTOR(int, pthread_join, void *th, void **ret) {
911  SCOPED_INTERCEPTOR_RAW(pthread_join, th, ret);
912  int tid = ThreadTid(thr, pc, (uptr)th);
913  int res = BLOCK_REAL(pthread_join)(th, ret);
914  if (res == 0) {
915    ThreadJoin(thr, pc, tid);
916  }
917  return res;
918}
919
920TSAN_INTERCEPTOR(int, pthread_detach, void *th) {
921  SCOPED_TSAN_INTERCEPTOR(pthread_detach, th);
922  int tid = ThreadTid(thr, pc, (uptr)th);
923  int res = REAL(pthread_detach)(th);
924  if (res == 0) {
925    ThreadDetach(thr, pc, tid);
926  }
927  return res;
928}
929
930TSAN_INTERCEPTOR(int, pthread_mutex_init, void *m, void *a) {
931  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_init, m, a);
932  int res = REAL(pthread_mutex_init)(m, a);
933  if (res == 0) {
934    bool recursive = false;
935    if (a) {
936      int type = 0;
937      if (pthread_mutexattr_gettype(a, &type) == 0)
938        recursive = (type == PTHREAD_MUTEX_RECURSIVE
939            || type == PTHREAD_MUTEX_RECURSIVE_NP);
940    }
941    MutexCreate(thr, pc, (uptr)m, false, recursive, false);
942  }
943  return res;
944}
945
946TSAN_INTERCEPTOR(int, pthread_mutex_destroy, void *m) {
947  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_destroy, m);
948  int res = REAL(pthread_mutex_destroy)(m);
949  if (res == 0 || res == EBUSY) {
950    MutexDestroy(thr, pc, (uptr)m);
951  }
952  return res;
953}
954
955TSAN_INTERCEPTOR(int, pthread_mutex_lock, void *m) {
956  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_lock, m);
957  int res = REAL(pthread_mutex_lock)(m);
958  if (res == 0) {
959    MutexLock(thr, pc, (uptr)m);
960  }
961  return res;
962}
963
964TSAN_INTERCEPTOR(int, pthread_mutex_trylock, void *m) {
965  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_trylock, m);
966  int res = REAL(pthread_mutex_trylock)(m);
967  if (res == 0) {
968    MutexLock(thr, pc, (uptr)m);
969  }
970  return res;
971}
972
973TSAN_INTERCEPTOR(int, pthread_mutex_timedlock, void *m, void *abstime) {
974  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_timedlock, m, abstime);
975  int res = REAL(pthread_mutex_timedlock)(m, abstime);
976  if (res == 0) {
977    MutexLock(thr, pc, (uptr)m);
978  }
979  return res;
980}
981
982TSAN_INTERCEPTOR(int, pthread_mutex_unlock, void *m) {
983  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_unlock, m);
984  MutexUnlock(thr, pc, (uptr)m);
985  int res = REAL(pthread_mutex_unlock)(m);
986  return res;
987}
988
989TSAN_INTERCEPTOR(int, pthread_spin_init, void *m, int pshared) {
990  SCOPED_TSAN_INTERCEPTOR(pthread_spin_init, m, pshared);
991  int res = REAL(pthread_spin_init)(m, pshared);
992  if (res == 0) {
993    MutexCreate(thr, pc, (uptr)m, false, false, false);
994  }
995  return res;
996}
997
998TSAN_INTERCEPTOR(int, pthread_spin_destroy, void *m) {
999  SCOPED_TSAN_INTERCEPTOR(pthread_spin_destroy, m);
1000  int res = REAL(pthread_spin_destroy)(m);
1001  if (res == 0) {
1002    MutexDestroy(thr, pc, (uptr)m);
1003  }
1004  return res;
1005}
1006
1007TSAN_INTERCEPTOR(int, pthread_spin_lock, void *m) {
1008  SCOPED_TSAN_INTERCEPTOR(pthread_spin_lock, m);
1009  int res = REAL(pthread_spin_lock)(m);
1010  if (res == 0) {
1011    MutexLock(thr, pc, (uptr)m);
1012  }
1013  return res;
1014}
1015
1016TSAN_INTERCEPTOR(int, pthread_spin_trylock, void *m) {
1017  SCOPED_TSAN_INTERCEPTOR(pthread_spin_trylock, m);
1018  int res = REAL(pthread_spin_trylock)(m);
1019  if (res == 0) {
1020    MutexLock(thr, pc, (uptr)m);
1021  }
1022  return res;
1023}
1024
1025TSAN_INTERCEPTOR(int, pthread_spin_unlock, void *m) {
1026  SCOPED_TSAN_INTERCEPTOR(pthread_spin_unlock, m);
1027  MutexUnlock(thr, pc, (uptr)m);
1028  int res = REAL(pthread_spin_unlock)(m);
1029  return res;
1030}
1031
1032TSAN_INTERCEPTOR(int, pthread_rwlock_init, void *m, void *a) {
1033  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_init, m, a);
1034  int res = REAL(pthread_rwlock_init)(m, a);
1035  if (res == 0) {
1036    MutexCreate(thr, pc, (uptr)m, true, false, false);
1037  }
1038  return res;
1039}
1040
1041TSAN_INTERCEPTOR(int, pthread_rwlock_destroy, void *m) {
1042  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_destroy, m);
1043  int res = REAL(pthread_rwlock_destroy)(m);
1044  if (res == 0) {
1045    MutexDestroy(thr, pc, (uptr)m);
1046  }
1047  return res;
1048}
1049
1050TSAN_INTERCEPTOR(int, pthread_rwlock_rdlock, void *m) {
1051  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_rdlock, m);
1052  int res = REAL(pthread_rwlock_rdlock)(m);
1053  if (res == 0) {
1054    MutexReadLock(thr, pc, (uptr)m);
1055  }
1056  return res;
1057}
1058
1059TSAN_INTERCEPTOR(int, pthread_rwlock_tryrdlock, void *m) {
1060  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_tryrdlock, m);
1061  int res = REAL(pthread_rwlock_tryrdlock)(m);
1062  if (res == 0) {
1063    MutexReadLock(thr, pc, (uptr)m);
1064  }
1065  return res;
1066}
1067
1068TSAN_INTERCEPTOR(int, pthread_rwlock_timedrdlock, void *m, void *abstime) {
1069  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedrdlock, m, abstime);
1070  int res = REAL(pthread_rwlock_timedrdlock)(m, abstime);
1071  if (res == 0) {
1072    MutexReadLock(thr, pc, (uptr)m);
1073  }
1074  return res;
1075}
1076
1077TSAN_INTERCEPTOR(int, pthread_rwlock_wrlock, void *m) {
1078  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_wrlock, m);
1079  int res = REAL(pthread_rwlock_wrlock)(m);
1080  if (res == 0) {
1081    MutexLock(thr, pc, (uptr)m);
1082  }
1083  return res;
1084}
1085
1086TSAN_INTERCEPTOR(int, pthread_rwlock_trywrlock, void *m) {
1087  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_trywrlock, m);
1088  int res = REAL(pthread_rwlock_trywrlock)(m);
1089  if (res == 0) {
1090    MutexLock(thr, pc, (uptr)m);
1091  }
1092  return res;
1093}
1094
1095TSAN_INTERCEPTOR(int, pthread_rwlock_timedwrlock, void *m, void *abstime) {
1096  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedwrlock, m, abstime);
1097  int res = REAL(pthread_rwlock_timedwrlock)(m, abstime);
1098  if (res == 0) {
1099    MutexLock(thr, pc, (uptr)m);
1100  }
1101  return res;
1102}
1103
1104TSAN_INTERCEPTOR(int, pthread_rwlock_unlock, void *m) {
1105  SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_unlock, m);
1106  MutexReadOrWriteUnlock(thr, pc, (uptr)m);
1107  int res = REAL(pthread_rwlock_unlock)(m);
1108  return res;
1109}
1110
1111TSAN_INTERCEPTOR(int, pthread_cond_init, void *c, void *a) {
1112  SCOPED_TSAN_INTERCEPTOR(pthread_cond_init, c, a);
1113  MemoryWrite(thr, pc, (uptr)c, kSizeLog1);
1114  int res = REAL(pthread_cond_init)(c, a);
1115  return res;
1116}
1117
1118TSAN_INTERCEPTOR(int, pthread_cond_destroy, void *c) {
1119  SCOPED_TSAN_INTERCEPTOR(pthread_cond_destroy, c);
1120  MemoryWrite(thr, pc, (uptr)c, kSizeLog1);
1121  int res = REAL(pthread_cond_destroy)(c);
1122  return res;
1123}
1124
1125TSAN_INTERCEPTOR(int, pthread_cond_signal, void *c) {
1126  SCOPED_TSAN_INTERCEPTOR(pthread_cond_signal, c);
1127  MemoryRead(thr, pc, (uptr)c, kSizeLog1);
1128  int res = REAL(pthread_cond_signal)(c);
1129  return res;
1130}
1131
1132TSAN_INTERCEPTOR(int, pthread_cond_broadcast, void *c) {
1133  SCOPED_TSAN_INTERCEPTOR(pthread_cond_broadcast, c);
1134  MemoryRead(thr, pc, (uptr)c, kSizeLog1);
1135  int res = REAL(pthread_cond_broadcast)(c);
1136  return res;
1137}
1138
1139TSAN_INTERCEPTOR(int, pthread_cond_wait, void *c, void *m) {
1140  SCOPED_TSAN_INTERCEPTOR(pthread_cond_wait, c, m);
1141  MutexUnlock(thr, pc, (uptr)m);
1142  MemoryRead(thr, pc, (uptr)c, kSizeLog1);
1143  int res = REAL(pthread_cond_wait)(c, m);
1144  MutexLock(thr, pc, (uptr)m);
1145  return res;
1146}
1147
1148TSAN_INTERCEPTOR(int, pthread_cond_timedwait, void *c, void *m,
1149    void *abstime) {
1150  SCOPED_TSAN_INTERCEPTOR(pthread_cond_timedwait, c, m, abstime);
1151  MutexUnlock(thr, pc, (uptr)m);
1152  MemoryRead(thr, pc, (uptr)c, kSizeLog1);
1153  int res = REAL(pthread_cond_timedwait)(c, m, abstime);
1154  MutexLock(thr, pc, (uptr)m);
1155  return res;
1156}
1157
1158TSAN_INTERCEPTOR(int, pthread_barrier_init, void *b, void *a, unsigned count) {
1159  SCOPED_TSAN_INTERCEPTOR(pthread_barrier_init, b, a, count);
1160  MemoryWrite(thr, pc, (uptr)b, kSizeLog1);
1161  int res = REAL(pthread_barrier_init)(b, a, count);
1162  return res;
1163}
1164
1165TSAN_INTERCEPTOR(int, pthread_barrier_destroy, void *b) {
1166  SCOPED_TSAN_INTERCEPTOR(pthread_barrier_destroy, b);
1167  MemoryWrite(thr, pc, (uptr)b, kSizeLog1);
1168  int res = REAL(pthread_barrier_destroy)(b);
1169  return res;
1170}
1171
1172TSAN_INTERCEPTOR(int, pthread_barrier_wait, void *b) {
1173  SCOPED_TSAN_INTERCEPTOR(pthread_barrier_wait, b);
1174  Release(thr, pc, (uptr)b);
1175  MemoryRead(thr, pc, (uptr)b, kSizeLog1);
1176  int res = REAL(pthread_barrier_wait)(b);
1177  MemoryRead(thr, pc, (uptr)b, kSizeLog1);
1178  if (res == 0 || res == PTHREAD_BARRIER_SERIAL_THREAD) {
1179    Acquire(thr, pc, (uptr)b);
1180  }
1181  return res;
1182}
1183
1184TSAN_INTERCEPTOR(int, pthread_once, void *o, void (*f)()) {
1185  SCOPED_INTERCEPTOR_RAW(pthread_once, o, f);
1186  // Using SCOPED_INTERCEPTOR_RAW, because if we are called from an ignored lib,
1187  // the user callback must be executed with thr->in_rtl == 0.
1188  if (o == 0 || f == 0)
1189    return EINVAL;
1190  atomic_uint32_t *a = static_cast<atomic_uint32_t*>(o);
1191  u32 v = atomic_load(a, memory_order_acquire);
1192  if (v == 0 && atomic_compare_exchange_strong(a, &v, 1,
1193                                               memory_order_relaxed)) {
1194    const int old_in_rtl = thr->in_rtl;
1195    thr->in_rtl = 0;
1196    (*f)();
1197    CHECK_EQ(thr->in_rtl, 0);
1198    thr->in_rtl = old_in_rtl;
1199    if (!thr->in_ignored_lib)
1200      Release(thr, pc, (uptr)o);
1201    atomic_store(a, 2, memory_order_release);
1202  } else {
1203    while (v != 2) {
1204      pthread_yield();
1205      v = atomic_load(a, memory_order_acquire);
1206    }
1207    if (!thr->in_ignored_lib)
1208      Acquire(thr, pc, (uptr)o);
1209  }
1210  return 0;
1211}
1212
1213TSAN_INTERCEPTOR(int, sem_init, void *s, int pshared, unsigned value) {
1214  SCOPED_TSAN_INTERCEPTOR(sem_init, s, pshared, value);
1215  int res = REAL(sem_init)(s, pshared, value);
1216  return res;
1217}
1218
1219TSAN_INTERCEPTOR(int, sem_destroy, void *s) {
1220  SCOPED_TSAN_INTERCEPTOR(sem_destroy, s);
1221  int res = REAL(sem_destroy)(s);
1222  return res;
1223}
1224
1225TSAN_INTERCEPTOR(int, sem_wait, void *s) {
1226  SCOPED_TSAN_INTERCEPTOR(sem_wait, s);
1227  int res = BLOCK_REAL(sem_wait)(s);
1228  if (res == 0) {
1229    Acquire(thr, pc, (uptr)s);
1230  }
1231  return res;
1232}
1233
1234TSAN_INTERCEPTOR(int, sem_trywait, void *s) {
1235  SCOPED_TSAN_INTERCEPTOR(sem_trywait, s);
1236  int res = BLOCK_REAL(sem_trywait)(s);
1237  if (res == 0) {
1238    Acquire(thr, pc, (uptr)s);
1239  }
1240  return res;
1241}
1242
1243TSAN_INTERCEPTOR(int, sem_timedwait, void *s, void *abstime) {
1244  SCOPED_TSAN_INTERCEPTOR(sem_timedwait, s, abstime);
1245  int res = BLOCK_REAL(sem_timedwait)(s, abstime);
1246  if (res == 0) {
1247    Acquire(thr, pc, (uptr)s);
1248  }
1249  return res;
1250}
1251
1252TSAN_INTERCEPTOR(int, sem_post, void *s) {
1253  SCOPED_TSAN_INTERCEPTOR(sem_post, s);
1254  Release(thr, pc, (uptr)s);
1255  int res = REAL(sem_post)(s);
1256  return res;
1257}
1258
1259TSAN_INTERCEPTOR(int, sem_getvalue, void *s, int *sval) {
1260  SCOPED_TSAN_INTERCEPTOR(sem_getvalue, s, sval);
1261  int res = REAL(sem_getvalue)(s, sval);
1262  if (res == 0) {
1263    Acquire(thr, pc, (uptr)s);
1264  }
1265  return res;
1266}
1267
1268TSAN_INTERCEPTOR(int, __xstat, int version, const char *path, void *buf) {
1269  SCOPED_TSAN_INTERCEPTOR(__xstat, version, path, buf);
1270  return REAL(__xstat)(version, path, buf);
1271}
1272
1273TSAN_INTERCEPTOR(int, stat, const char *path, void *buf) {
1274  SCOPED_TSAN_INTERCEPTOR(__xstat, 0, path, buf);
1275  return REAL(__xstat)(0, path, buf);
1276}
1277
1278TSAN_INTERCEPTOR(int, __xstat64, int version, const char *path, void *buf) {
1279  SCOPED_TSAN_INTERCEPTOR(__xstat64, version, path, buf);
1280  return REAL(__xstat64)(version, path, buf);
1281}
1282
1283TSAN_INTERCEPTOR(int, stat64, const char *path, void *buf) {
1284  SCOPED_TSAN_INTERCEPTOR(__xstat64, 0, path, buf);
1285  return REAL(__xstat64)(0, path, buf);
1286}
1287
1288TSAN_INTERCEPTOR(int, __lxstat, int version, const char *path, void *buf) {
1289  SCOPED_TSAN_INTERCEPTOR(__lxstat, version, path, buf);
1290  return REAL(__lxstat)(version, path, buf);
1291}
1292
1293TSAN_INTERCEPTOR(int, lstat, const char *path, void *buf) {
1294  SCOPED_TSAN_INTERCEPTOR(__lxstat, 0, path, buf);
1295  return REAL(__lxstat)(0, path, buf);
1296}
1297
1298TSAN_INTERCEPTOR(int, __lxstat64, int version, const char *path, void *buf) {
1299  SCOPED_TSAN_INTERCEPTOR(__lxstat64, version, path, buf);
1300  return REAL(__lxstat64)(version, path, buf);
1301}
1302
1303TSAN_INTERCEPTOR(int, lstat64, const char *path, void *buf) {
1304  SCOPED_TSAN_INTERCEPTOR(__lxstat64, 0, path, buf);
1305  return REAL(__lxstat64)(0, path, buf);
1306}
1307
1308TSAN_INTERCEPTOR(int, __fxstat, int version, int fd, void *buf) {
1309  SCOPED_TSAN_INTERCEPTOR(__fxstat, version, fd, buf);
1310  if (fd > 0)
1311    FdAccess(thr, pc, fd);
1312  return REAL(__fxstat)(version, fd, buf);
1313}
1314
1315TSAN_INTERCEPTOR(int, fstat, int fd, void *buf) {
1316  SCOPED_TSAN_INTERCEPTOR(__fxstat, 0, fd, buf);
1317  if (fd > 0)
1318    FdAccess(thr, pc, fd);
1319  return REAL(__fxstat)(0, fd, buf);
1320}
1321
1322TSAN_INTERCEPTOR(int, __fxstat64, int version, int fd, void *buf) {
1323  SCOPED_TSAN_INTERCEPTOR(__fxstat64, version, fd, buf);
1324  if (fd > 0)
1325    FdAccess(thr, pc, fd);
1326  return REAL(__fxstat64)(version, fd, buf);
1327}
1328
1329TSAN_INTERCEPTOR(int, fstat64, int fd, void *buf) {
1330  SCOPED_TSAN_INTERCEPTOR(__fxstat64, 0, fd, buf);
1331  if (fd > 0)
1332    FdAccess(thr, pc, fd);
1333  return REAL(__fxstat64)(0, fd, buf);
1334}
1335
1336TSAN_INTERCEPTOR(int, open, const char *name, int flags, int mode) {
1337  SCOPED_TSAN_INTERCEPTOR(open, name, flags, mode);
1338  int fd = REAL(open)(name, flags, mode);
1339  if (fd >= 0)
1340    FdFileCreate(thr, pc, fd);
1341  return fd;
1342}
1343
1344TSAN_INTERCEPTOR(int, open64, const char *name, int flags, int mode) {
1345  SCOPED_TSAN_INTERCEPTOR(open64, name, flags, mode);
1346  int fd = REAL(open64)(name, flags, mode);
1347  if (fd >= 0)
1348    FdFileCreate(thr, pc, fd);
1349  return fd;
1350}
1351
1352TSAN_INTERCEPTOR(int, creat, const char *name, int mode) {
1353  SCOPED_TSAN_INTERCEPTOR(creat, name, mode);
1354  int fd = REAL(creat)(name, mode);
1355  if (fd >= 0)
1356    FdFileCreate(thr, pc, fd);
1357  return fd;
1358}
1359
1360TSAN_INTERCEPTOR(int, creat64, const char *name, int mode) {
1361  SCOPED_TSAN_INTERCEPTOR(creat64, name, mode);
1362  int fd = REAL(creat64)(name, mode);
1363  if (fd >= 0)
1364    FdFileCreate(thr, pc, fd);
1365  return fd;
1366}
1367
1368TSAN_INTERCEPTOR(int, dup, int oldfd) {
1369  SCOPED_TSAN_INTERCEPTOR(dup, oldfd);
1370  int newfd = REAL(dup)(oldfd);
1371  if (oldfd >= 0 && newfd >= 0 && newfd != oldfd)
1372    FdDup(thr, pc, oldfd, newfd);
1373  return newfd;
1374}
1375
1376TSAN_INTERCEPTOR(int, dup2, int oldfd, int newfd) {
1377  SCOPED_TSAN_INTERCEPTOR(dup2, oldfd, newfd);
1378  int newfd2 = REAL(dup2)(oldfd, newfd);
1379  if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
1380    FdDup(thr, pc, oldfd, newfd2);
1381  return newfd2;
1382}
1383
1384TSAN_INTERCEPTOR(int, dup3, int oldfd, int newfd, int flags) {
1385  SCOPED_TSAN_INTERCEPTOR(dup3, oldfd, newfd, flags);
1386  int newfd2 = REAL(dup3)(oldfd, newfd, flags);
1387  if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
1388    FdDup(thr, pc, oldfd, newfd2);
1389  return newfd2;
1390}
1391
1392TSAN_INTERCEPTOR(int, eventfd, unsigned initval, int flags) {
1393  SCOPED_TSAN_INTERCEPTOR(eventfd, initval, flags);
1394  int fd = REAL(eventfd)(initval, flags);
1395  if (fd >= 0)
1396    FdEventCreate(thr, pc, fd);
1397  return fd;
1398}
1399
1400TSAN_INTERCEPTOR(int, signalfd, int fd, void *mask, int flags) {
1401  SCOPED_TSAN_INTERCEPTOR(signalfd, fd, mask, flags);
1402  if (fd >= 0)
1403    FdClose(thr, pc, fd);
1404  fd = REAL(signalfd)(fd, mask, flags);
1405  if (fd >= 0)
1406    FdSignalCreate(thr, pc, fd);
1407  return fd;
1408}
1409
1410TSAN_INTERCEPTOR(int, inotify_init, int fake) {
1411  SCOPED_TSAN_INTERCEPTOR(inotify_init, fake);
1412  int fd = REAL(inotify_init)(fake);
1413  if (fd >= 0)
1414    FdInotifyCreate(thr, pc, fd);
1415  return fd;
1416}
1417
1418TSAN_INTERCEPTOR(int, inotify_init1, int flags) {
1419  SCOPED_TSAN_INTERCEPTOR(inotify_init1, flags);
1420  int fd = REAL(inotify_init1)(flags);
1421  if (fd >= 0)
1422    FdInotifyCreate(thr, pc, fd);
1423  return fd;
1424}
1425
1426TSAN_INTERCEPTOR(int, socket, int domain, int type, int protocol) {
1427  SCOPED_TSAN_INTERCEPTOR(socket, domain, type, protocol);
1428  int fd = REAL(socket)(domain, type, protocol);
1429  if (fd >= 0)
1430    FdSocketCreate(thr, pc, fd);
1431  return fd;
1432}
1433
1434TSAN_INTERCEPTOR(int, socketpair, int domain, int type, int protocol, int *fd) {
1435  SCOPED_TSAN_INTERCEPTOR(socketpair, domain, type, protocol, fd);
1436  int res = REAL(socketpair)(domain, type, protocol, fd);
1437  if (res == 0 && fd[0] >= 0 && fd[1] >= 0)
1438    FdPipeCreate(thr, pc, fd[0], fd[1]);
1439  return res;
1440}
1441
1442TSAN_INTERCEPTOR(int, connect, int fd, void *addr, unsigned addrlen) {
1443  SCOPED_TSAN_INTERCEPTOR(connect, fd, addr, addrlen);
1444  FdSocketConnecting(thr, pc, fd);
1445  int res = REAL(connect)(fd, addr, addrlen);
1446  if (res == 0 && fd >= 0)
1447    FdSocketConnect(thr, pc, fd);
1448  return res;
1449}
1450
1451TSAN_INTERCEPTOR(int, bind, int fd, void *addr, unsigned addrlen) {
1452  SCOPED_TSAN_INTERCEPTOR(bind, fd, addr, addrlen);
1453  int res = REAL(bind)(fd, addr, addrlen);
1454  if (fd > 0 && res == 0)
1455    FdAccess(thr, pc, fd);
1456  return res;
1457}
1458
1459TSAN_INTERCEPTOR(int, listen, int fd, int backlog) {
1460  SCOPED_TSAN_INTERCEPTOR(listen, fd, backlog);
1461  int res = REAL(listen)(fd, backlog);
1462  if (fd > 0 && res == 0)
1463    FdAccess(thr, pc, fd);
1464  return res;
1465}
1466
1467TSAN_INTERCEPTOR(int, epoll_create, int size) {
1468  SCOPED_TSAN_INTERCEPTOR(epoll_create, size);
1469  int fd = REAL(epoll_create)(size);
1470  if (fd >= 0)
1471    FdPollCreate(thr, pc, fd);
1472  return fd;
1473}
1474
1475TSAN_INTERCEPTOR(int, epoll_create1, int flags) {
1476  SCOPED_TSAN_INTERCEPTOR(epoll_create1, flags);
1477  int fd = REAL(epoll_create1)(flags);
1478  if (fd >= 0)
1479    FdPollCreate(thr, pc, fd);
1480  return fd;
1481}
1482
1483TSAN_INTERCEPTOR(int, close, int fd) {
1484  SCOPED_TSAN_INTERCEPTOR(close, fd);
1485  if (fd >= 0)
1486    FdClose(thr, pc, fd);
1487  return REAL(close)(fd);
1488}
1489
1490TSAN_INTERCEPTOR(int, __close, int fd) {
1491  SCOPED_TSAN_INTERCEPTOR(__close, fd);
1492  if (fd >= 0)
1493    FdClose(thr, pc, fd);
1494  return REAL(__close)(fd);
1495}
1496
1497// glibc guts
1498TSAN_INTERCEPTOR(void, __res_iclose, void *state, bool free_addr) {
1499  SCOPED_TSAN_INTERCEPTOR(__res_iclose, state, free_addr);
1500  int fds[64];
1501  int cnt = ExtractResolvFDs(state, fds, ARRAY_SIZE(fds));
1502  for (int i = 0; i < cnt; i++) {
1503    if (fds[i] > 0)
1504      FdClose(thr, pc, fds[i]);
1505  }
1506  REAL(__res_iclose)(state, free_addr);
1507}
1508
1509TSAN_INTERCEPTOR(int, pipe, int *pipefd) {
1510  SCOPED_TSAN_INTERCEPTOR(pipe, pipefd);
1511  int res = REAL(pipe)(pipefd);
1512  if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
1513    FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
1514  return res;
1515}
1516
1517TSAN_INTERCEPTOR(int, pipe2, int *pipefd, int flags) {
1518  SCOPED_TSAN_INTERCEPTOR(pipe2, pipefd, flags);
1519  int res = REAL(pipe2)(pipefd, flags);
1520  if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
1521    FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
1522  return res;
1523}
1524
1525TSAN_INTERCEPTOR(long_t, send, int fd, void *buf, long_t len, int flags) {
1526  SCOPED_TSAN_INTERCEPTOR(send, fd, buf, len, flags);
1527  if (fd >= 0) {
1528    FdAccess(thr, pc, fd);
1529    FdRelease(thr, pc, fd);
1530  }
1531  int res = REAL(send)(fd, buf, len, flags);
1532  return res;
1533}
1534
1535TSAN_INTERCEPTOR(long_t, sendmsg, int fd, void *msg, int flags) {
1536  SCOPED_TSAN_INTERCEPTOR(sendmsg, fd, msg, flags);
1537  if (fd >= 0) {
1538    FdAccess(thr, pc, fd);
1539    FdRelease(thr, pc, fd);
1540  }
1541  int res = REAL(sendmsg)(fd, msg, flags);
1542  return res;
1543}
1544
1545TSAN_INTERCEPTOR(long_t, recv, int fd, void *buf, long_t len, int flags) {
1546  SCOPED_TSAN_INTERCEPTOR(recv, fd, buf, len, flags);
1547  if (fd >= 0)
1548    FdAccess(thr, pc, fd);
1549  int res = REAL(recv)(fd, buf, len, flags);
1550  if (res >= 0 && fd >= 0) {
1551    FdAcquire(thr, pc, fd);
1552  }
1553  return res;
1554}
1555
1556TSAN_INTERCEPTOR(int, unlink, char *path) {
1557  SCOPED_TSAN_INTERCEPTOR(unlink, path);
1558  Release(thr, pc, File2addr(path));
1559  int res = REAL(unlink)(path);
1560  return res;
1561}
1562
1563TSAN_INTERCEPTOR(void*, fopen, char *path, char *mode) {
1564  SCOPED_TSAN_INTERCEPTOR(fopen, path, mode);
1565  void *res = REAL(fopen)(path, mode);
1566  Acquire(thr, pc, File2addr(path));
1567  if (res) {
1568    int fd = fileno_unlocked(res);
1569    if (fd >= 0)
1570      FdFileCreate(thr, pc, fd);
1571  }
1572  return res;
1573}
1574
1575TSAN_INTERCEPTOR(void*, freopen, char *path, char *mode, void *stream) {
1576  SCOPED_TSAN_INTERCEPTOR(freopen, path, mode, stream);
1577  if (stream) {
1578    int fd = fileno_unlocked(stream);
1579    if (fd >= 0)
1580      FdClose(thr, pc, fd);
1581  }
1582  void *res = REAL(freopen)(path, mode, stream);
1583  Acquire(thr, pc, File2addr(path));
1584  if (res) {
1585    int fd = fileno_unlocked(res);
1586    if (fd >= 0)
1587      FdFileCreate(thr, pc, fd);
1588  }
1589  return res;
1590}
1591
1592TSAN_INTERCEPTOR(int, fclose, void *stream) {
1593  {
1594    SCOPED_TSAN_INTERCEPTOR(fclose, stream);
1595    if (stream) {
1596      int fd = fileno_unlocked(stream);
1597      if (fd >= 0)
1598        FdClose(thr, pc, fd);
1599    }
1600  }
1601  return REAL(fclose)(stream);
1602}
1603
1604TSAN_INTERCEPTOR(uptr, fread, void *ptr, uptr size, uptr nmemb, void *f) {
1605  {
1606    SCOPED_TSAN_INTERCEPTOR(fread, ptr, size, nmemb, f);
1607    MemoryAccessRange(thr, pc, (uptr)ptr, size * nmemb, true);
1608  }
1609  return REAL(fread)(ptr, size, nmemb, f);
1610}
1611
1612TSAN_INTERCEPTOR(uptr, fwrite, const void *p, uptr size, uptr nmemb, void *f) {
1613  {
1614    SCOPED_TSAN_INTERCEPTOR(fwrite, p, size, nmemb, f);
1615    MemoryAccessRange(thr, pc, (uptr)p, size * nmemb, false);
1616  }
1617  return REAL(fwrite)(p, size, nmemb, f);
1618}
1619
1620TSAN_INTERCEPTOR(int, fflush, void *stream) {
1621  SCOPED_TSAN_INTERCEPTOR(fflush, stream);
1622  return REAL(fflush)(stream);
1623}
1624
1625TSAN_INTERCEPTOR(void, abort, int fake) {
1626  SCOPED_TSAN_INTERCEPTOR(abort, fake);
1627  REAL(fflush)(0);
1628  REAL(abort)(fake);
1629}
1630
1631TSAN_INTERCEPTOR(int, puts, const char *s) {
1632  SCOPED_TSAN_INTERCEPTOR(puts, s);
1633  MemoryAccessRange(thr, pc, (uptr)s, internal_strlen(s), false);
1634  return REAL(puts)(s);
1635}
1636
1637TSAN_INTERCEPTOR(int, rmdir, char *path) {
1638  SCOPED_TSAN_INTERCEPTOR(rmdir, path);
1639  Release(thr, pc, Dir2addr(path));
1640  int res = REAL(rmdir)(path);
1641  return res;
1642}
1643
1644TSAN_INTERCEPTOR(void*, opendir, char *path) {
1645  SCOPED_TSAN_INTERCEPTOR(opendir, path);
1646  void *res = REAL(opendir)(path);
1647  if (res != 0)
1648    Acquire(thr, pc, Dir2addr(path));
1649  return res;
1650}
1651
1652TSAN_INTERCEPTOR(int, epoll_ctl, int epfd, int op, int fd, void *ev) {
1653  SCOPED_TSAN_INTERCEPTOR(epoll_ctl, epfd, op, fd, ev);
1654  if (epfd >= 0)
1655    FdAccess(thr, pc, epfd);
1656  if (epfd >= 0 && fd >= 0)
1657    FdAccess(thr, pc, fd);
1658  if (op == EPOLL_CTL_ADD && epfd >= 0)
1659    FdRelease(thr, pc, epfd);
1660  int res = REAL(epoll_ctl)(epfd, op, fd, ev);
1661  return res;
1662}
1663
1664TSAN_INTERCEPTOR(int, epoll_wait, int epfd, void *ev, int cnt, int timeout) {
1665  SCOPED_TSAN_INTERCEPTOR(epoll_wait, epfd, ev, cnt, timeout);
1666  if (epfd >= 0)
1667    FdAccess(thr, pc, epfd);
1668  int res = BLOCK_REAL(epoll_wait)(epfd, ev, cnt, timeout);
1669  if (res > 0 && epfd >= 0)
1670    FdAcquire(thr, pc, epfd);
1671  return res;
1672}
1673
1674void ALWAYS_INLINE rtl_generic_sighandler(bool sigact, int sig,
1675    my_siginfo_t *info, void *ctx) {
1676  ThreadState *thr = cur_thread();
1677  SignalContext *sctx = SigCtx(thr);
1678  // Don't mess with synchronous signals.
1679  if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
1680      sig == SIGABRT || sig == SIGFPE || sig == SIGPIPE || sig == SIGSYS ||
1681      // If we are sending signal to ourselves, we must process it now.
1682      (sctx && sig == sctx->int_signal_send) ||
1683      // If we are in blocking function, we can safely process it now
1684      // (but check if we are in a recursive interceptor,
1685      // i.e. pthread_join()->munmap()).
1686      (sctx && sctx->in_blocking_func == 1 && thr->in_rtl == 1)) {
1687    int in_rtl = thr->in_rtl;
1688    thr->in_rtl = 0;
1689    CHECK_EQ(thr->in_signal_handler, false);
1690    thr->in_signal_handler = true;
1691    if (sigact)
1692      sigactions[sig].sa_sigaction(sig, info, ctx);
1693    else
1694      sigactions[sig].sa_handler(sig);
1695    CHECK_EQ(thr->in_signal_handler, true);
1696    thr->in_signal_handler = false;
1697    thr->in_rtl = in_rtl;
1698    return;
1699  }
1700
1701  if (sctx == 0)
1702    return;
1703  SignalDesc *signal = &sctx->pending_signals[sig];
1704  if (signal->armed == false) {
1705    signal->armed = true;
1706    signal->sigaction = sigact;
1707    if (info)
1708      internal_memcpy(&signal->siginfo, info, sizeof(*info));
1709    if (ctx)
1710      internal_memcpy(&signal->ctx, ctx, sizeof(signal->ctx));
1711    sctx->pending_signal_count++;
1712  }
1713}
1714
1715static void rtl_sighandler(int sig) {
1716  rtl_generic_sighandler(false, sig, 0, 0);
1717}
1718
1719static void rtl_sigaction(int sig, my_siginfo_t *info, void *ctx) {
1720  rtl_generic_sighandler(true, sig, info, ctx);
1721}
1722
1723TSAN_INTERCEPTOR(int, sigaction, int sig, sigaction_t *act, sigaction_t *old) {
1724  SCOPED_TSAN_INTERCEPTOR(sigaction, sig, act, old);
1725  if (old)
1726    internal_memcpy(old, &sigactions[sig], sizeof(*old));
1727  if (act == 0)
1728    return 0;
1729  internal_memcpy(&sigactions[sig], act, sizeof(*act));
1730  sigaction_t newact;
1731  internal_memcpy(&newact, act, sizeof(newact));
1732  REAL(sigfillset)(&newact.sa_mask);
1733  if (act->sa_handler != SIG_IGN && act->sa_handler != SIG_DFL) {
1734    if (newact.sa_flags & SA_SIGINFO)
1735      newact.sa_sigaction = rtl_sigaction;
1736    else
1737      newact.sa_handler = rtl_sighandler;
1738  }
1739  int res = REAL(sigaction)(sig, &newact, 0);
1740  return res;
1741}
1742
1743TSAN_INTERCEPTOR(sighandler_t, signal, int sig, sighandler_t h) {
1744  sigaction_t act;
1745  act.sa_handler = h;
1746  REAL(memset)(&act.sa_mask, -1, sizeof(act.sa_mask));
1747  act.sa_flags = 0;
1748  sigaction_t old;
1749  int res = sigaction(sig, &act, &old);
1750  if (res)
1751    return SIG_ERR;
1752  return old.sa_handler;
1753}
1754
1755TSAN_INTERCEPTOR(int, sigsuspend, const __sanitizer_sigset_t *mask) {
1756  SCOPED_TSAN_INTERCEPTOR(sigsuspend, mask);
1757  return REAL(sigsuspend)(mask);
1758}
1759
1760TSAN_INTERCEPTOR(int, raise, int sig) {
1761  SCOPED_TSAN_INTERCEPTOR(raise, sig);
1762  SignalContext *sctx = SigCtx(thr);
1763  CHECK_NE(sctx, 0);
1764  int prev = sctx->int_signal_send;
1765  sctx->int_signal_send = sig;
1766  int res = REAL(raise)(sig);
1767  CHECK_EQ(sctx->int_signal_send, sig);
1768  sctx->int_signal_send = prev;
1769  return res;
1770}
1771
1772TSAN_INTERCEPTOR(int, kill, int pid, int sig) {
1773  SCOPED_TSAN_INTERCEPTOR(kill, pid, sig);
1774  SignalContext *sctx = SigCtx(thr);
1775  CHECK_NE(sctx, 0);
1776  int prev = sctx->int_signal_send;
1777  if (pid == (int)internal_getpid()) {
1778    sctx->int_signal_send = sig;
1779  }
1780  int res = REAL(kill)(pid, sig);
1781  if (pid == (int)internal_getpid()) {
1782    CHECK_EQ(sctx->int_signal_send, sig);
1783    sctx->int_signal_send = prev;
1784  }
1785  return res;
1786}
1787
1788TSAN_INTERCEPTOR(int, pthread_kill, void *tid, int sig) {
1789  SCOPED_TSAN_INTERCEPTOR(pthread_kill, tid, sig);
1790  SignalContext *sctx = SigCtx(thr);
1791  CHECK_NE(sctx, 0);
1792  int prev = sctx->int_signal_send;
1793  if (tid == pthread_self()) {
1794    sctx->int_signal_send = sig;
1795  }
1796  int res = REAL(pthread_kill)(tid, sig);
1797  if (tid == pthread_self()) {
1798    CHECK_EQ(sctx->int_signal_send, sig);
1799    sctx->int_signal_send = prev;
1800  }
1801  return res;
1802}
1803
1804TSAN_INTERCEPTOR(int, gettimeofday, void *tv, void *tz) {
1805  SCOPED_TSAN_INTERCEPTOR(gettimeofday, tv, tz);
1806  // It's intercepted merely to process pending signals.
1807  return REAL(gettimeofday)(tv, tz);
1808}
1809
1810TSAN_INTERCEPTOR(int, getaddrinfo, void *node, void *service,
1811    void *hints, void *rv) {
1812  SCOPED_TSAN_INTERCEPTOR(getaddrinfo, node, service, hints, rv);
1813  // We miss atomic synchronization in getaddrinfo,
1814  // and can report false race between malloc and free
1815  // inside of getaddrinfo. So ignore memory accesses.
1816  ThreadIgnoreBegin(thr);
1817  // getaddrinfo calls fopen, which can be intercepted by user.
1818  thr->in_rtl--;
1819  CHECK_EQ(thr->in_rtl, 0);
1820  int res = REAL(getaddrinfo)(node, service, hints, rv);
1821  thr->in_rtl++;
1822  ThreadIgnoreEnd(thr);
1823  return res;
1824}
1825
1826// Linux kernel has a bug that leads to kernel deadlock if a process
1827// maps TBs of memory and then calls mlock().
1828static void MlockIsUnsupported() {
1829  static atomic_uint8_t printed;
1830  if (atomic_exchange(&printed, 1, memory_order_relaxed))
1831    return;
1832  if (flags()->verbosity > 0)
1833    Printf("INFO: ThreadSanitizer ignores mlock/mlockall/munlock/munlockall\n");
1834}
1835
1836TSAN_INTERCEPTOR(int, mlock, const void *addr, uptr len) {
1837  MlockIsUnsupported();
1838  return 0;
1839}
1840
1841TSAN_INTERCEPTOR(int, munlock, const void *addr, uptr len) {
1842  MlockIsUnsupported();
1843  return 0;
1844}
1845
1846TSAN_INTERCEPTOR(int, mlockall, int flags) {
1847  MlockIsUnsupported();
1848  return 0;
1849}
1850
1851TSAN_INTERCEPTOR(int, munlockall, void) {
1852  MlockIsUnsupported();
1853  return 0;
1854}
1855
1856TSAN_INTERCEPTOR(int, fork, int fake) {
1857  SCOPED_INTERCEPTOR_RAW(fork, fake);
1858  int pid = REAL(fork)(fake);
1859  if (pid == 0) {
1860    // child
1861    FdOnFork(thr, pc);
1862  } else if (pid > 0) {
1863    // parent
1864  }
1865  return pid;
1866}
1867
1868static int OnExit(ThreadState *thr) {
1869  int status = Finalize(thr);
1870  REAL(fflush)(0);
1871  return status;
1872}
1873
1874struct TsanInterceptorContext {
1875  ThreadState *thr;
1876  const uptr caller_pc;
1877  const uptr pc;
1878};
1879
1880#include "sanitizer_common/sanitizer_platform_interceptors.h"
1881// Causes interceptor recursion (getpwuid_r() calls fopen())
1882#undef SANITIZER_INTERCEPT_GETPWNAM_AND_FRIENDS
1883#undef SANITIZER_INTERCEPT_GETPWNAM_R_AND_FRIENDS
1884// Causes interceptor recursion (getaddrinfo() and fopen())
1885#undef SANITIZER_INTERCEPT_GETADDRINFO
1886#undef SANITIZER_INTERCEPT_GETNAMEINFO
1887// Causes interceptor recursion (glob64() calls lstat64())
1888#undef SANITIZER_INTERCEPT_GLOB
1889
1890#define COMMON_INTERCEPTOR_UNPOISON_PARAM(ctx, count) \
1891  do {                                                \
1892  } while (false)
1893#define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size)                    \
1894  MemoryAccessRange(((TsanInterceptorContext *)ctx)->thr,                 \
1895                    ((TsanInterceptorContext *)ctx)->pc, (uptr)ptr, size, \
1896                    true)
1897#define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size)                       \
1898  MemoryAccessRange(((TsanInterceptorContext *) ctx)->thr,                  \
1899                    ((TsanInterceptorContext *) ctx)->pc, (uptr) ptr, size, \
1900                    false)
1901#define COMMON_INTERCEPTOR_ENTER(ctx, func, ...)      \
1902  SCOPED_TSAN_INTERCEPTOR(func, __VA_ARGS__);         \
1903  TsanInterceptorContext _ctx = {thr, caller_pc, pc}; \
1904  ctx = (void *)&_ctx;                                \
1905  (void) ctx;
1906#define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \
1907  FdAcquire(((TsanInterceptorContext *) ctx)->thr, pc, fd)
1908#define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \
1909  FdRelease(((TsanInterceptorContext *) ctx)->thr, pc, fd)
1910#define COMMON_INTERCEPTOR_FD_ACCESS(ctx, fd) \
1911  FdAccess(((TsanInterceptorContext *) ctx)->thr, pc, fd)
1912#define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd) \
1913  FdSocketAccept(((TsanInterceptorContext *) ctx)->thr, pc, fd, newfd)
1914#define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) \
1915  ThreadSetName(((TsanInterceptorContext *) ctx)->thr, name)
1916#define COMMON_INTERCEPTOR_BLOCK_REAL(name) BLOCK_REAL(name)
1917#define COMMON_INTERCEPTOR_ON_EXIT(ctx) \
1918  OnExit(((TsanInterceptorContext *) ctx)->thr)
1919#include "sanitizer_common/sanitizer_common_interceptors.inc"
1920
1921#define TSAN_SYSCALL() \
1922  ThreadState *thr = cur_thread(); \
1923  ScopedSyscall scoped_syscall(thr) \
1924/**/
1925
1926struct ScopedSyscall {
1927  ThreadState *thr;
1928
1929  explicit ScopedSyscall(ThreadState *thr)
1930      : thr(thr) {
1931    if (thr->in_rtl == 0)
1932      Initialize(thr);
1933    thr->in_rtl++;
1934  }
1935
1936  ~ScopedSyscall() {
1937    thr->in_rtl--;
1938    if (thr->in_rtl == 0)
1939      ProcessPendingSignals(thr);
1940  }
1941};
1942
1943static void syscall_access_range(uptr pc, uptr p, uptr s, bool write) {
1944  TSAN_SYSCALL();
1945  MemoryAccessRange(thr, pc, p, s, write);
1946}
1947
1948static void syscall_fd_close(uptr pc, int fd) {
1949  TSAN_SYSCALL();
1950  if (fd >= 0)
1951    FdClose(thr, pc, fd);
1952}
1953
1954static void syscall_pre_fork(uptr pc) {
1955  TSAN_SYSCALL();
1956}
1957
1958static void syscall_post_fork(uptr pc, int res) {
1959  TSAN_SYSCALL();
1960  if (res == 0) {
1961    // child
1962    FdOnFork(thr, pc);
1963  } else if (res > 0) {
1964    // parent
1965  }
1966}
1967
1968#define COMMON_SYSCALL_PRE_READ_RANGE(p, s) \
1969  syscall_access_range(GET_CALLER_PC(), (uptr)(p), (uptr)(s), false)
1970#define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) \
1971  syscall_access_range(GET_CALLER_PC(), (uptr)(p), (uptr)(s), true)
1972#define COMMON_SYSCALL_POST_READ_RANGE(p, s) \
1973  do { } while (false)
1974#define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) \
1975  do { } while (false)
1976#define COMMON_SYSCALL_FD_CLOSE(fd) \
1977  syscall_fd_close(GET_CALLER_PC(), fd)
1978#define COMMON_SYSCALL_PRE_FORK() \
1979  syscall_pre_fork(GET_CALLER_PC())
1980#define COMMON_SYSCALL_POST_FORK(res) \
1981  syscall_post_fork(GET_CALLER_PC(), res)
1982#include "sanitizer_common/sanitizer_common_syscalls.inc"
1983
1984namespace __tsan {
1985
1986static void finalize(void *arg) {
1987  ThreadState *thr = cur_thread();
1988  uptr pc = 0;
1989  atexit_ctx->exit(thr, pc);
1990  int status = Finalize(thr);
1991  REAL(fflush)(0);
1992  if (status)
1993    REAL(_exit)(status);
1994}
1995
1996void ProcessPendingSignals(ThreadState *thr) {
1997  CHECK_EQ(thr->in_rtl, 0);
1998  SignalContext *sctx = SigCtx(thr);
1999  if (sctx == 0 || sctx->pending_signal_count == 0 || thr->in_signal_handler)
2000    return;
2001  Context *ctx = CTX();
2002  thr->in_signal_handler = true;
2003  sctx->pending_signal_count = 0;
2004  // These are too big for stack.
2005  static THREADLOCAL __sanitizer_sigset_t emptyset, oldset;
2006  REAL(sigfillset)(&emptyset);
2007  pthread_sigmask(SIG_SETMASK, &emptyset, &oldset);
2008  for (int sig = 0; sig < kSigCount; sig++) {
2009    SignalDesc *signal = &sctx->pending_signals[sig];
2010    if (signal->armed) {
2011      signal->armed = false;
2012      if (sigactions[sig].sa_handler != SIG_DFL
2013          && sigactions[sig].sa_handler != SIG_IGN) {
2014        // Insure that the handler does not spoil errno.
2015        const int saved_errno = errno;
2016        errno = 0;
2017        if (signal->sigaction)
2018          sigactions[sig].sa_sigaction(sig, &signal->siginfo, &signal->ctx);
2019        else
2020          sigactions[sig].sa_handler(sig);
2021        if (flags()->report_bugs && errno != 0) {
2022          ScopedInRtl in_rtl;
2023          __tsan::StackTrace stack;
2024          uptr pc = signal->sigaction ?
2025              (uptr)sigactions[sig].sa_sigaction :
2026              (uptr)sigactions[sig].sa_handler;
2027          pc += 1;  // return address is expected, OutputReport() will undo this
2028          stack.Init(&pc, 1);
2029          ThreadRegistryLock l(ctx->thread_registry);
2030          ScopedReport rep(ReportTypeErrnoInSignal);
2031          if (!IsFiredSuppression(ctx, rep, stack)) {
2032            rep.AddStack(&stack);
2033            OutputReport(ctx, rep, rep.GetReport()->stacks[0]);
2034          }
2035        }
2036        errno = saved_errno;
2037      }
2038    }
2039  }
2040  pthread_sigmask(SIG_SETMASK, &oldset, 0);
2041  CHECK_EQ(thr->in_signal_handler, true);
2042  thr->in_signal_handler = false;
2043}
2044
2045static void unreachable() {
2046  Printf("FATAL: ThreadSanitizer: unreachable called\n");
2047  Die();
2048}
2049
2050void InitializeInterceptors() {
2051  CHECK_GT(cur_thread()->in_rtl, 0);
2052
2053  // We need to setup it early, because functions like dlsym() can call it.
2054  REAL(memset) = internal_memset;
2055  REAL(memcpy) = internal_memcpy;
2056  REAL(memcmp) = internal_memcmp;
2057
2058  // Instruct libc malloc to consume less memory.
2059  mallopt(1, 0);  // M_MXFAST
2060  mallopt(-3, 32*1024);  // M_MMAP_THRESHOLD
2061
2062  SANITIZER_COMMON_INTERCEPTORS_INIT;
2063
2064  TSAN_INTERCEPT(setjmp);
2065  TSAN_INTERCEPT(_setjmp);
2066  TSAN_INTERCEPT(sigsetjmp);
2067  TSAN_INTERCEPT(__sigsetjmp);
2068  TSAN_INTERCEPT(longjmp);
2069  TSAN_INTERCEPT(siglongjmp);
2070
2071  TSAN_INTERCEPT(malloc);
2072  TSAN_INTERCEPT(__libc_memalign);
2073  TSAN_INTERCEPT(calloc);
2074  TSAN_INTERCEPT(realloc);
2075  TSAN_INTERCEPT(free);
2076  TSAN_INTERCEPT(cfree);
2077  TSAN_INTERCEPT(mmap);
2078  TSAN_INTERCEPT(mmap64);
2079  TSAN_INTERCEPT(munmap);
2080  TSAN_INTERCEPT(memalign);
2081  TSAN_INTERCEPT(valloc);
2082  TSAN_INTERCEPT(pvalloc);
2083  TSAN_INTERCEPT(posix_memalign);
2084
2085  TSAN_INTERCEPT(strlen);
2086  TSAN_INTERCEPT(memset);
2087  TSAN_INTERCEPT(memcpy);
2088  TSAN_INTERCEPT(memchr);
2089  TSAN_INTERCEPT(memrchr);
2090  TSAN_INTERCEPT(memmove);
2091  TSAN_INTERCEPT(memcmp);
2092  TSAN_INTERCEPT(strchr);
2093  TSAN_INTERCEPT(strchrnul);
2094  TSAN_INTERCEPT(strrchr);
2095  TSAN_INTERCEPT(strcpy);  // NOLINT
2096  TSAN_INTERCEPT(strncpy);
2097  TSAN_INTERCEPT(strstr);
2098  TSAN_INTERCEPT(strdup);
2099
2100  TSAN_INTERCEPT(pthread_create);
2101  TSAN_INTERCEPT(pthread_join);
2102  TSAN_INTERCEPT(pthread_detach);
2103
2104  TSAN_INTERCEPT(pthread_mutex_init);
2105  TSAN_INTERCEPT(pthread_mutex_destroy);
2106  TSAN_INTERCEPT(pthread_mutex_lock);
2107  TSAN_INTERCEPT(pthread_mutex_trylock);
2108  TSAN_INTERCEPT(pthread_mutex_timedlock);
2109  TSAN_INTERCEPT(pthread_mutex_unlock);
2110
2111  TSAN_INTERCEPT(pthread_spin_init);
2112  TSAN_INTERCEPT(pthread_spin_destroy);
2113  TSAN_INTERCEPT(pthread_spin_lock);
2114  TSAN_INTERCEPT(pthread_spin_trylock);
2115  TSAN_INTERCEPT(pthread_spin_unlock);
2116
2117  TSAN_INTERCEPT(pthread_rwlock_init);
2118  TSAN_INTERCEPT(pthread_rwlock_destroy);
2119  TSAN_INTERCEPT(pthread_rwlock_rdlock);
2120  TSAN_INTERCEPT(pthread_rwlock_tryrdlock);
2121  TSAN_INTERCEPT(pthread_rwlock_timedrdlock);
2122  TSAN_INTERCEPT(pthread_rwlock_wrlock);
2123  TSAN_INTERCEPT(pthread_rwlock_trywrlock);
2124  TSAN_INTERCEPT(pthread_rwlock_timedwrlock);
2125  TSAN_INTERCEPT(pthread_rwlock_unlock);
2126
2127  INTERCEPT_FUNCTION_VER(pthread_cond_init, GLIBC_2.3.2);
2128  INTERCEPT_FUNCTION_VER(pthread_cond_destroy, GLIBC_2.3.2);
2129  INTERCEPT_FUNCTION_VER(pthread_cond_signal, GLIBC_2.3.2);
2130  INTERCEPT_FUNCTION_VER(pthread_cond_broadcast, GLIBC_2.3.2);
2131  INTERCEPT_FUNCTION_VER(pthread_cond_wait, GLIBC_2.3.2);
2132  INTERCEPT_FUNCTION_VER(pthread_cond_timedwait, GLIBC_2.3.2);
2133
2134  TSAN_INTERCEPT(pthread_barrier_init);
2135  TSAN_INTERCEPT(pthread_barrier_destroy);
2136  TSAN_INTERCEPT(pthread_barrier_wait);
2137
2138  TSAN_INTERCEPT(pthread_once);
2139
2140  TSAN_INTERCEPT(sem_init);
2141  TSAN_INTERCEPT(sem_destroy);
2142  TSAN_INTERCEPT(sem_wait);
2143  TSAN_INTERCEPT(sem_trywait);
2144  TSAN_INTERCEPT(sem_timedwait);
2145  TSAN_INTERCEPT(sem_post);
2146  TSAN_INTERCEPT(sem_getvalue);
2147
2148  TSAN_INTERCEPT(stat);
2149  TSAN_INTERCEPT(__xstat);
2150  TSAN_INTERCEPT(stat64);
2151  TSAN_INTERCEPT(__xstat64);
2152  TSAN_INTERCEPT(lstat);
2153  TSAN_INTERCEPT(__lxstat);
2154  TSAN_INTERCEPT(lstat64);
2155  TSAN_INTERCEPT(__lxstat64);
2156  TSAN_INTERCEPT(fstat);
2157  TSAN_INTERCEPT(__fxstat);
2158  TSAN_INTERCEPT(fstat64);
2159  TSAN_INTERCEPT(__fxstat64);
2160  TSAN_INTERCEPT(open);
2161  TSAN_INTERCEPT(open64);
2162  TSAN_INTERCEPT(creat);
2163  TSAN_INTERCEPT(creat64);
2164  TSAN_INTERCEPT(dup);
2165  TSAN_INTERCEPT(dup2);
2166  TSAN_INTERCEPT(dup3);
2167  TSAN_INTERCEPT(eventfd);
2168  TSAN_INTERCEPT(signalfd);
2169  TSAN_INTERCEPT(inotify_init);
2170  TSAN_INTERCEPT(inotify_init1);
2171  TSAN_INTERCEPT(socket);
2172  TSAN_INTERCEPT(socketpair);
2173  TSAN_INTERCEPT(connect);
2174  TSAN_INTERCEPT(bind);
2175  TSAN_INTERCEPT(listen);
2176  TSAN_INTERCEPT(epoll_create);
2177  TSAN_INTERCEPT(epoll_create1);
2178  TSAN_INTERCEPT(close);
2179  TSAN_INTERCEPT(__close);
2180  TSAN_INTERCEPT(__res_iclose);
2181  TSAN_INTERCEPT(pipe);
2182  TSAN_INTERCEPT(pipe2);
2183
2184  TSAN_INTERCEPT(send);
2185  TSAN_INTERCEPT(sendmsg);
2186  TSAN_INTERCEPT(recv);
2187
2188  TSAN_INTERCEPT(unlink);
2189  TSAN_INTERCEPT(fopen);
2190  TSAN_INTERCEPT(freopen);
2191  TSAN_INTERCEPT(fclose);
2192  TSAN_INTERCEPT(fread);
2193  TSAN_INTERCEPT(fwrite);
2194  TSAN_INTERCEPT(fflush);
2195  TSAN_INTERCEPT(abort);
2196  TSAN_INTERCEPT(puts);
2197  TSAN_INTERCEPT(rmdir);
2198  TSAN_INTERCEPT(opendir);
2199
2200  TSAN_INTERCEPT(epoll_ctl);
2201  TSAN_INTERCEPT(epoll_wait);
2202
2203  TSAN_INTERCEPT(sigaction);
2204  TSAN_INTERCEPT(signal);
2205  TSAN_INTERCEPT(sigsuspend);
2206  TSAN_INTERCEPT(raise);
2207  TSAN_INTERCEPT(kill);
2208  TSAN_INTERCEPT(pthread_kill);
2209  TSAN_INTERCEPT(sleep);
2210  TSAN_INTERCEPT(usleep);
2211  TSAN_INTERCEPT(nanosleep);
2212  TSAN_INTERCEPT(gettimeofday);
2213  TSAN_INTERCEPT(getaddrinfo);
2214
2215  TSAN_INTERCEPT(mlock);
2216  TSAN_INTERCEPT(munlock);
2217  TSAN_INTERCEPT(mlockall);
2218  TSAN_INTERCEPT(munlockall);
2219
2220  TSAN_INTERCEPT(fork);
2221  TSAN_INTERCEPT(dlopen);
2222  TSAN_INTERCEPT(dlclose);
2223  TSAN_INTERCEPT(on_exit);
2224  TSAN_INTERCEPT(__cxa_atexit);
2225  TSAN_INTERCEPT(_exit);
2226
2227  // Need to setup it, because interceptors check that the function is resolved.
2228  // But atexit is emitted directly into the module, so can't be resolved.
2229  REAL(atexit) = (int(*)(void(*)()))unreachable;
2230  atexit_ctx = new(internal_alloc(MBlockAtExit, sizeof(AtExitContext)))
2231      AtExitContext();
2232
2233  if (REAL(__cxa_atexit)(&finalize, 0, 0)) {
2234    Printf("ThreadSanitizer: failed to setup atexit callback\n");
2235    Die();
2236  }
2237
2238  if (pthread_key_create(&g_thread_finalize_key, &thread_finalize)) {
2239    Printf("ThreadSanitizer: failed to create thread key\n");
2240    Die();
2241  }
2242
2243  FdInit();
2244}
2245
2246void internal_start_thread(void(*func)(void *arg), void *arg) {
2247  void *th;
2248  REAL(pthread_create)(&th, 0, (void*(*)(void *arg))func, arg);
2249  REAL(pthread_detach)(th);
2250}
2251
2252}  // namespace __tsan
2253