• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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 "sanitizer_common/sanitizer_tls_get_addr.h"
23 #include "interception/interception.h"
24 #include "tsan_interceptors.h"
25 #include "tsan_interface.h"
26 #include "tsan_platform.h"
27 #include "tsan_suppressions.h"
28 #include "tsan_rtl.h"
29 #include "tsan_mman.h"
30 #include "tsan_fd.h"
31 
32 #if SANITIZER_POSIX
33 #include "sanitizer_common/sanitizer_posix.h"
34 #endif
35 
36 using namespace __tsan;  // NOLINT
37 
38 #if SANITIZER_FREEBSD || SANITIZER_MAC
39 #define __errno_location __error
40 #define stdout __stdoutp
41 #define stderr __stderrp
42 #endif
43 
44 #if SANITIZER_ANDROID
45 #define __errno_location __errno
46 #define mallopt(a, b)
47 #endif
48 
49 #if SANITIZER_LINUX || SANITIZER_FREEBSD
50 #define PTHREAD_CREATE_DETACHED 1
51 #elif SANITIZER_MAC
52 #define PTHREAD_CREATE_DETACHED 2
53 #endif
54 
55 
56 #ifdef __mips__
57 const int kSigCount = 129;
58 #else
59 const int kSigCount = 65;
60 #endif
61 
62 struct my_siginfo_t {
63   // The size is determined by looking at sizeof of real siginfo_t on linux.
64   u64 opaque[128 / sizeof(u64)];
65 };
66 
67 #ifdef __mips__
68 struct ucontext_t {
69   u64 opaque[768 / sizeof(u64) + 1];
70 };
71 #else
72 struct ucontext_t {
73   // The size is determined by looking at sizeof of real ucontext_t on linux.
74   u64 opaque[936 / sizeof(u64) + 1];
75 };
76 #endif
77 
78 #if defined(__x86_64__) || defined(__mips__) || SANITIZER_PPC64V1
79 #define PTHREAD_ABI_BASE  "GLIBC_2.3.2"
80 #elif defined(__aarch64__) || SANITIZER_PPC64V2
81 #define PTHREAD_ABI_BASE  "GLIBC_2.17"
82 #endif
83 
84 extern "C" int pthread_attr_init(void *attr);
85 extern "C" int pthread_attr_destroy(void *attr);
86 DECLARE_REAL(int, pthread_attr_getdetachstate, void *, void *)
87 extern "C" int pthread_attr_setstacksize(void *attr, uptr stacksize);
88 extern "C" int pthread_key_create(unsigned *key, void (*destructor)(void* v));
89 extern "C" int pthread_setspecific(unsigned key, const void *v);
90 DECLARE_REAL(int, pthread_mutexattr_gettype, void *, void *)
91 extern "C" int pthread_sigmask(int how, const __sanitizer_sigset_t *set,
92                                __sanitizer_sigset_t *oldset);
93 DECLARE_REAL(int, fflush, __sanitizer_FILE *fp)
94 DECLARE_REAL_AND_INTERCEPTOR(void *, malloc, uptr size)
95 DECLARE_REAL_AND_INTERCEPTOR(void, free, void *ptr)
96 extern "C" void *pthread_self();
97 extern "C" void _exit(int status);
98 extern "C" int *__errno_location();
99 extern "C" int fileno_unlocked(void *stream);
100 extern "C" int dirfd(void *dirp);
101 #if !SANITIZER_FREEBSD && !SANITIZER_ANDROID
102 extern "C" int mallopt(int param, int value);
103 #endif
104 extern __sanitizer_FILE *stdout, *stderr;
105 #if !SANITIZER_FREEBSD && !SANITIZER_MAC
106 const int PTHREAD_MUTEX_RECURSIVE = 1;
107 const int PTHREAD_MUTEX_RECURSIVE_NP = 1;
108 #else
109 const int PTHREAD_MUTEX_RECURSIVE = 2;
110 const int PTHREAD_MUTEX_RECURSIVE_NP = 2;
111 #endif
112 const int EINVAL = 22;
113 const int EBUSY = 16;
114 const int EOWNERDEAD = 130;
115 #if !SANITIZER_FREEBSD && !SANITIZER_MAC
116 const int EPOLL_CTL_ADD = 1;
117 #endif
118 const int SIGILL = 4;
119 const int SIGABRT = 6;
120 const int SIGFPE = 8;
121 const int SIGSEGV = 11;
122 const int SIGPIPE = 13;
123 const int SIGTERM = 15;
124 #if defined(__mips__) || SANITIZER_FREEBSD || SANITIZER_MAC
125 const int SIGBUS = 10;
126 const int SIGSYS = 12;
127 #else
128 const int SIGBUS = 7;
129 const int SIGSYS = 31;
130 #endif
131 void *const MAP_FAILED = (void*)-1;
132 #if !SANITIZER_MAC
133 const int PTHREAD_BARRIER_SERIAL_THREAD = -1;
134 #endif
135 const int MAP_FIXED = 0x10;
136 typedef long long_t;  // NOLINT
137 
138 // From /usr/include/unistd.h
139 # define F_ULOCK 0      /* Unlock a previously locked region.  */
140 # define F_LOCK  1      /* Lock a region for exclusive use.  */
141 # define F_TLOCK 2      /* Test and lock a region for exclusive use.  */
142 # define F_TEST  3      /* Test a region for other processes locks.  */
143 
144 #define errno (*__errno_location())
145 
146 typedef void (*sighandler_t)(int sig);
147 typedef void (*sigactionhandler_t)(int sig, my_siginfo_t *siginfo, void *uctx);
148 
149 #if SANITIZER_ANDROID
150 struct sigaction_t {
151   u32 sa_flags;
152   union {
153     sighandler_t sa_handler;
154     sigactionhandler_t sa_sigaction;
155   };
156   __sanitizer_sigset_t sa_mask;
157   void (*sa_restorer)();
158 };
159 #else
160 struct sigaction_t {
161 #ifdef __mips__
162   u32 sa_flags;
163 #endif
164   union {
165     sighandler_t sa_handler;
166     sigactionhandler_t sa_sigaction;
167   };
168 #if SANITIZER_FREEBSD
169   int sa_flags;
170   __sanitizer_sigset_t sa_mask;
171 #elif SANITIZER_MAC
172   __sanitizer_sigset_t sa_mask;
173   int sa_flags;
174 #else
175   __sanitizer_sigset_t sa_mask;
176 #ifndef __mips__
177   int sa_flags;
178 #endif
179   void (*sa_restorer)();
180 #endif
181 };
182 #endif
183 
184 const sighandler_t SIG_DFL = (sighandler_t)0;
185 const sighandler_t SIG_IGN = (sighandler_t)1;
186 const sighandler_t SIG_ERR = (sighandler_t)-1;
187 #if SANITIZER_FREEBSD || SANITIZER_MAC
188 const int SA_SIGINFO = 0x40;
189 const int SIG_SETMASK = 3;
190 #elif defined(__mips__)
191 const int SA_SIGINFO = 8;
192 const int SIG_SETMASK = 3;
193 #else
194 const int SA_SIGINFO = 4;
195 const int SIG_SETMASK = 2;
196 #endif
197 
198 #define COMMON_INTERCEPTOR_NOTHING_IS_INITIALIZED \
199   (!cur_thread()->is_inited)
200 
201 static sigaction_t sigactions[kSigCount];
202 
203 namespace __tsan {
204 struct SignalDesc {
205   bool armed;
206   bool sigaction;
207   my_siginfo_t siginfo;
208   ucontext_t ctx;
209 };
210 
211 struct ThreadSignalContext {
212   int int_signal_send;
213   atomic_uintptr_t in_blocking_func;
214   atomic_uintptr_t have_pending_signals;
215   SignalDesc pending_signals[kSigCount];
216   // emptyset and oldset are too big for stack.
217   __sanitizer_sigset_t emptyset;
218   __sanitizer_sigset_t oldset;
219 };
220 
221 // The object is 64-byte aligned, because we want hot data to be located in
222 // a single cache line if possible (it's accessed in every interceptor).
223 static ALIGNED(64) char libignore_placeholder[sizeof(LibIgnore)];
libignore()224 static LibIgnore *libignore() {
225   return reinterpret_cast<LibIgnore*>(&libignore_placeholder[0]);
226 }
227 
InitializeLibIgnore()228 void InitializeLibIgnore() {
229   const SuppressionContext &supp = *Suppressions();
230   const uptr n = supp.SuppressionCount();
231   for (uptr i = 0; i < n; i++) {
232     const Suppression *s = supp.SuppressionAt(i);
233     if (0 == internal_strcmp(s->type, kSuppressionLib))
234       libignore()->AddIgnoredLibrary(s->templ);
235   }
236   libignore()->OnLibraryLoaded(0);
237 }
238 
239 }  // namespace __tsan
240 
SigCtx(ThreadState * thr)241 static ThreadSignalContext *SigCtx(ThreadState *thr) {
242   ThreadSignalContext *ctx = (ThreadSignalContext*)thr->signal_ctx;
243   if (ctx == 0 && !thr->is_dead) {
244     ctx = (ThreadSignalContext*)MmapOrDie(sizeof(*ctx), "ThreadSignalContext");
245     MemoryResetRange(thr, (uptr)&SigCtx, (uptr)ctx, sizeof(*ctx));
246     thr->signal_ctx = ctx;
247   }
248   return ctx;
249 }
250 
251 #if !SANITIZER_MAC
252 static unsigned g_thread_finalize_key;
253 #endif
254 
ScopedInterceptor(ThreadState * thr,const char * fname,uptr pc)255 ScopedInterceptor::ScopedInterceptor(ThreadState *thr, const char *fname,
256                                      uptr pc)
257     : thr_(thr)
258     , pc_(pc)
259     , in_ignored_lib_(false) {
260   Initialize(thr);
261   if (!thr_->is_inited)
262     return;
263   if (!thr_->ignore_interceptors)
264     FuncEntry(thr, pc);
265   DPrintf("#%d: intercept %s()\n", thr_->tid, fname);
266   if (!thr_->in_ignored_lib && libignore()->IsIgnored(pc)) {
267     in_ignored_lib_ = true;
268     thr_->in_ignored_lib = true;
269     ThreadIgnoreBegin(thr_, pc_);
270   }
271   if (flags()->ignore_interceptors_accesses) ThreadIgnoreBegin(thr_, pc_);
272 }
273 
~ScopedInterceptor()274 ScopedInterceptor::~ScopedInterceptor() {
275   if (!thr_->is_inited)
276     return;
277   if (flags()->ignore_interceptors_accesses) ThreadIgnoreEnd(thr_, pc_);
278   if (in_ignored_lib_) {
279     thr_->in_ignored_lib = false;
280     ThreadIgnoreEnd(thr_, pc_);
281   }
282   if (!thr_->ignore_interceptors) {
283     ProcessPendingSignals(thr_);
284     FuncExit(thr_);
285     CheckNoLocks(thr_);
286   }
287 }
288 
UserCallbackStart()289 void ScopedInterceptor::UserCallbackStart() {
290   if (flags()->ignore_interceptors_accesses) ThreadIgnoreEnd(thr_, pc_);
291   if (in_ignored_lib_) {
292     thr_->in_ignored_lib = false;
293     ThreadIgnoreEnd(thr_, pc_);
294   }
295 }
296 
UserCallbackEnd()297 void ScopedInterceptor::UserCallbackEnd() {
298   if (in_ignored_lib_) {
299     thr_->in_ignored_lib = true;
300     ThreadIgnoreBegin(thr_, pc_);
301   }
302   if (flags()->ignore_interceptors_accesses) ThreadIgnoreBegin(thr_, pc_);
303 }
304 
305 #define TSAN_INTERCEPT(func) INTERCEPT_FUNCTION(func)
306 #if SANITIZER_FREEBSD
307 # define TSAN_INTERCEPT_VER(func, ver) INTERCEPT_FUNCTION(func)
308 #else
309 # define TSAN_INTERCEPT_VER(func, ver) INTERCEPT_FUNCTION_VER(func, ver)
310 #endif
311 
312 #define READ_STRING_OF_LEN(thr, pc, s, len, n)                 \
313   MemoryAccessRange((thr), (pc), (uptr)(s),                         \
314     common_flags()->strict_string_checks ? (len) + 1 : (n), false)
315 
316 #define READ_STRING(thr, pc, s, n)                             \
317     READ_STRING_OF_LEN((thr), (pc), (s), internal_strlen(s), (n))
318 
319 #define BLOCK_REAL(name) (BlockingCall(thr), REAL(name))
320 
321 struct BlockingCall {
BlockingCallBlockingCall322   explicit BlockingCall(ThreadState *thr)
323       : thr(thr)
324       , ctx(SigCtx(thr)) {
325     for (;;) {
326       atomic_store(&ctx->in_blocking_func, 1, memory_order_relaxed);
327       if (atomic_load(&ctx->have_pending_signals, memory_order_relaxed) == 0)
328         break;
329       atomic_store(&ctx->in_blocking_func, 0, memory_order_relaxed);
330       ProcessPendingSignals(thr);
331     }
332     // When we are in a "blocking call", we process signals asynchronously
333     // (right when they arrive). In this context we do not expect to be
334     // executing any user/runtime code. The known interceptor sequence when
335     // this is not true is: pthread_join -> munmap(stack). It's fine
336     // to ignore munmap in this case -- we handle stack shadow separately.
337     thr->ignore_interceptors++;
338   }
339 
~BlockingCallBlockingCall340   ~BlockingCall() {
341     thr->ignore_interceptors--;
342     atomic_store(&ctx->in_blocking_func, 0, memory_order_relaxed);
343   }
344 
345   ThreadState *thr;
346   ThreadSignalContext *ctx;
347 };
348 
TSAN_INTERCEPTOR(unsigned,sleep,unsigned sec)349 TSAN_INTERCEPTOR(unsigned, sleep, unsigned sec) {
350   SCOPED_TSAN_INTERCEPTOR(sleep, sec);
351   unsigned res = BLOCK_REAL(sleep)(sec);
352   AfterSleep(thr, pc);
353   return res;
354 }
355 
TSAN_INTERCEPTOR(int,usleep,long_t usec)356 TSAN_INTERCEPTOR(int, usleep, long_t usec) {
357   SCOPED_TSAN_INTERCEPTOR(usleep, usec);
358   int res = BLOCK_REAL(usleep)(usec);
359   AfterSleep(thr, pc);
360   return res;
361 }
362 
TSAN_INTERCEPTOR(int,nanosleep,void * req,void * rem)363 TSAN_INTERCEPTOR(int, nanosleep, void *req, void *rem) {
364   SCOPED_TSAN_INTERCEPTOR(nanosleep, req, rem);
365   int res = BLOCK_REAL(nanosleep)(req, rem);
366   AfterSleep(thr, pc);
367   return res;
368 }
369 
370 // The sole reason tsan wraps atexit callbacks is to establish synchronization
371 // between callback setup and callback execution.
372 struct AtExitCtx {
373   void (*f)();
374   void *arg;
375 };
376 
at_exit_wrapper(void * arg)377 static void at_exit_wrapper(void *arg) {
378   ThreadState *thr = cur_thread();
379   uptr pc = 0;
380   Acquire(thr, pc, (uptr)arg);
381   AtExitCtx *ctx = (AtExitCtx*)arg;
382   ((void(*)(void *arg))ctx->f)(ctx->arg);
383   InternalFree(ctx);
384 }
385 
386 static int setup_at_exit_wrapper(ThreadState *thr, uptr pc, void(*f)(),
387       void *arg, void *dso);
388 
389 #if !SANITIZER_ANDROID
TSAN_INTERCEPTOR(int,atexit,void (* f)())390 TSAN_INTERCEPTOR(int, atexit, void (*f)()) {
391   if (cur_thread()->in_symbolizer)
392     return 0;
393   // We want to setup the atexit callback even if we are in ignored lib
394   // or after fork.
395   SCOPED_INTERCEPTOR_RAW(atexit, f);
396   return setup_at_exit_wrapper(thr, pc, (void(*)())f, 0, 0);
397 }
398 #endif
399 
TSAN_INTERCEPTOR(int,__cxa_atexit,void (* f)(void * a),void * arg,void * dso)400 TSAN_INTERCEPTOR(int, __cxa_atexit, void (*f)(void *a), void *arg, void *dso) {
401   if (cur_thread()->in_symbolizer)
402     return 0;
403   SCOPED_TSAN_INTERCEPTOR(__cxa_atexit, f, arg, dso);
404   return setup_at_exit_wrapper(thr, pc, (void(*)())f, arg, dso);
405 }
406 
setup_at_exit_wrapper(ThreadState * thr,uptr pc,void (* f)(),void * arg,void * dso)407 static int setup_at_exit_wrapper(ThreadState *thr, uptr pc, void(*f)(),
408       void *arg, void *dso) {
409   AtExitCtx *ctx = (AtExitCtx*)InternalAlloc(sizeof(AtExitCtx));
410   ctx->f = f;
411   ctx->arg = arg;
412   Release(thr, pc, (uptr)ctx);
413   // Memory allocation in __cxa_atexit will race with free during exit,
414   // because we do not see synchronization around atexit callback list.
415   ThreadIgnoreBegin(thr, pc);
416   int res = REAL(__cxa_atexit)(at_exit_wrapper, ctx, dso);
417   ThreadIgnoreEnd(thr, pc);
418   return res;
419 }
420 
421 #if !SANITIZER_MAC
on_exit_wrapper(int status,void * arg)422 static void on_exit_wrapper(int status, void *arg) {
423   ThreadState *thr = cur_thread();
424   uptr pc = 0;
425   Acquire(thr, pc, (uptr)arg);
426   AtExitCtx *ctx = (AtExitCtx*)arg;
427   ((void(*)(int status, void *arg))ctx->f)(status, ctx->arg);
428   InternalFree(ctx);
429 }
430 
TSAN_INTERCEPTOR(int,on_exit,void (* f)(int,void *),void * arg)431 TSAN_INTERCEPTOR(int, on_exit, void(*f)(int, void*), void *arg) {
432   if (cur_thread()->in_symbolizer)
433     return 0;
434   SCOPED_TSAN_INTERCEPTOR(on_exit, f, arg);
435   AtExitCtx *ctx = (AtExitCtx*)InternalAlloc(sizeof(AtExitCtx));
436   ctx->f = (void(*)())f;
437   ctx->arg = arg;
438   Release(thr, pc, (uptr)ctx);
439   // Memory allocation in __cxa_atexit will race with free during exit,
440   // because we do not see synchronization around atexit callback list.
441   ThreadIgnoreBegin(thr, pc);
442   int res = REAL(on_exit)(on_exit_wrapper, ctx);
443   ThreadIgnoreEnd(thr, pc);
444   return res;
445 }
446 #endif
447 
448 // Cleanup old bufs.
JmpBufGarbageCollect(ThreadState * thr,uptr sp)449 static void JmpBufGarbageCollect(ThreadState *thr, uptr sp) {
450   for (uptr i = 0; i < thr->jmp_bufs.Size(); i++) {
451     JmpBuf *buf = &thr->jmp_bufs[i];
452     if (buf->sp <= sp) {
453       uptr sz = thr->jmp_bufs.Size();
454       internal_memcpy(buf, &thr->jmp_bufs[sz - 1], sizeof(*buf));
455       thr->jmp_bufs.PopBack();
456       i--;
457     }
458   }
459 }
460 
SetJmp(ThreadState * thr,uptr sp,uptr mangled_sp)461 static void SetJmp(ThreadState *thr, uptr sp, uptr mangled_sp) {
462   if (!thr->is_inited)  // called from libc guts during bootstrap
463     return;
464   // Cleanup old bufs.
465   JmpBufGarbageCollect(thr, sp);
466   // Remember the buf.
467   JmpBuf *buf = thr->jmp_bufs.PushBack();
468   buf->sp = sp;
469   buf->mangled_sp = mangled_sp;
470   buf->shadow_stack_pos = thr->shadow_stack_pos;
471   ThreadSignalContext *sctx = SigCtx(thr);
472   buf->int_signal_send = sctx ? sctx->int_signal_send : 0;
473   buf->in_blocking_func = sctx ?
474       atomic_load(&sctx->in_blocking_func, memory_order_relaxed) :
475       false;
476   buf->in_signal_handler = atomic_load(&thr->in_signal_handler,
477       memory_order_relaxed);
478 }
479 
LongJmp(ThreadState * thr,uptr * env)480 static void LongJmp(ThreadState *thr, uptr *env) {
481 #ifdef __powerpc__
482   uptr mangled_sp = env[0];
483 #elif SANITIZER_FREEBSD || SANITIZER_MAC
484   uptr mangled_sp = env[2];
485 #elif defined(SANITIZER_LINUX)
486 # ifdef __aarch64__
487   uptr mangled_sp = env[13];
488 # else
489   uptr mangled_sp = env[6];
490 # endif
491 #endif
492   // Find the saved buf by mangled_sp.
493   for (uptr i = 0; i < thr->jmp_bufs.Size(); i++) {
494     JmpBuf *buf = &thr->jmp_bufs[i];
495     if (buf->mangled_sp == mangled_sp) {
496       CHECK_GE(thr->shadow_stack_pos, buf->shadow_stack_pos);
497       // Unwind the stack.
498       while (thr->shadow_stack_pos > buf->shadow_stack_pos)
499         FuncExit(thr);
500       ThreadSignalContext *sctx = SigCtx(thr);
501       if (sctx) {
502         sctx->int_signal_send = buf->int_signal_send;
503         atomic_store(&sctx->in_blocking_func, buf->in_blocking_func,
504             memory_order_relaxed);
505       }
506       atomic_store(&thr->in_signal_handler, buf->in_signal_handler,
507           memory_order_relaxed);
508       JmpBufGarbageCollect(thr, buf->sp - 1);  // do not collect buf->sp
509       return;
510     }
511   }
512   Printf("ThreadSanitizer: can't find longjmp buf\n");
513   CHECK(0);
514 }
515 
516 // FIXME: put everything below into a common extern "C" block?
__tsan_setjmp(uptr sp,uptr mangled_sp)517 extern "C" void __tsan_setjmp(uptr sp, uptr mangled_sp) {
518   SetJmp(cur_thread(), sp, mangled_sp);
519 }
520 
521 #if SANITIZER_MAC
522 TSAN_INTERCEPTOR(int, setjmp, void *env);
523 TSAN_INTERCEPTOR(int, _setjmp, void *env);
524 TSAN_INTERCEPTOR(int, sigsetjmp, void *env);
525 #else  // SANITIZER_MAC
526 // Not called.  Merely to satisfy TSAN_INTERCEPT().
527 extern "C" SANITIZER_INTERFACE_ATTRIBUTE
528 int __interceptor_setjmp(void *env);
__interceptor_setjmp(void * env)529 extern "C" int __interceptor_setjmp(void *env) {
530   CHECK(0);
531   return 0;
532 }
533 
534 // FIXME: any reason to have a separate declaration?
535 extern "C" SANITIZER_INTERFACE_ATTRIBUTE
536 int __interceptor__setjmp(void *env);
__interceptor__setjmp(void * env)537 extern "C" int __interceptor__setjmp(void *env) {
538   CHECK(0);
539   return 0;
540 }
541 
542 extern "C" SANITIZER_INTERFACE_ATTRIBUTE
543 int __interceptor_sigsetjmp(void *env);
__interceptor_sigsetjmp(void * env)544 extern "C" int __interceptor_sigsetjmp(void *env) {
545   CHECK(0);
546   return 0;
547 }
548 
549 extern "C" SANITIZER_INTERFACE_ATTRIBUTE
550 int __interceptor___sigsetjmp(void *env);
__interceptor___sigsetjmp(void * env)551 extern "C" int __interceptor___sigsetjmp(void *env) {
552   CHECK(0);
553   return 0;
554 }
555 
556 extern "C" int setjmp(void *env);
557 extern "C" int _setjmp(void *env);
558 extern "C" int sigsetjmp(void *env);
559 extern "C" int __sigsetjmp(void *env);
DEFINE_REAL(int,setjmp,void * env)560 DEFINE_REAL(int, setjmp, void *env)
561 DEFINE_REAL(int, _setjmp, void *env)
562 DEFINE_REAL(int, sigsetjmp, void *env)
563 DEFINE_REAL(int, __sigsetjmp, void *env)
564 #endif  // SANITIZER_MAC
565 
566 TSAN_INTERCEPTOR(void, longjmp, uptr *env, int val) {
567   // Note: if we call REAL(longjmp) in the context of ScopedInterceptor,
568   // bad things will happen. We will jump over ScopedInterceptor dtor and can
569   // leave thr->in_ignored_lib set.
570   {
571     SCOPED_INTERCEPTOR_RAW(longjmp, env, val);
572   }
573   LongJmp(cur_thread(), env);
574   REAL(longjmp)(env, val);
575 }
576 
TSAN_INTERCEPTOR(void,siglongjmp,uptr * env,int val)577 TSAN_INTERCEPTOR(void, siglongjmp, uptr *env, int val) {
578   {
579     SCOPED_INTERCEPTOR_RAW(siglongjmp, env, val);
580   }
581   LongJmp(cur_thread(), env);
582   REAL(siglongjmp)(env, val);
583 }
584 
585 #if !SANITIZER_MAC
TSAN_INTERCEPTOR(void *,malloc,uptr size)586 TSAN_INTERCEPTOR(void*, malloc, uptr size) {
587   if (cur_thread()->in_symbolizer)
588     return InternalAlloc(size);
589   void *p = 0;
590   {
591     SCOPED_INTERCEPTOR_RAW(malloc, size);
592     p = user_alloc(thr, pc, size);
593   }
594   invoke_malloc_hook(p, size);
595   return p;
596 }
597 
TSAN_INTERCEPTOR(void *,__libc_memalign,uptr align,uptr sz)598 TSAN_INTERCEPTOR(void*, __libc_memalign, uptr align, uptr sz) {
599   SCOPED_TSAN_INTERCEPTOR(__libc_memalign, align, sz);
600   return user_alloc(thr, pc, sz, align);
601 }
602 
TSAN_INTERCEPTOR(void *,calloc,uptr size,uptr n)603 TSAN_INTERCEPTOR(void*, calloc, uptr size, uptr n) {
604   if (cur_thread()->in_symbolizer)
605     return InternalCalloc(size, n);
606   void *p = 0;
607   {
608     SCOPED_INTERCEPTOR_RAW(calloc, size, n);
609     p = user_calloc(thr, pc, size, n);
610   }
611   invoke_malloc_hook(p, n * size);
612   return p;
613 }
614 
TSAN_INTERCEPTOR(void *,realloc,void * p,uptr size)615 TSAN_INTERCEPTOR(void*, realloc, void *p, uptr size) {
616   if (cur_thread()->in_symbolizer)
617     return InternalRealloc(p, size);
618   if (p)
619     invoke_free_hook(p);
620   {
621     SCOPED_INTERCEPTOR_RAW(realloc, p, size);
622     p = user_realloc(thr, pc, p, size);
623   }
624   invoke_malloc_hook(p, size);
625   return p;
626 }
627 
TSAN_INTERCEPTOR(void,free,void * p)628 TSAN_INTERCEPTOR(void, free, void *p) {
629   if (p == 0)
630     return;
631   if (cur_thread()->in_symbolizer)
632     return InternalFree(p);
633   invoke_free_hook(p);
634   SCOPED_INTERCEPTOR_RAW(free, p);
635   user_free(thr, pc, p);
636 }
637 
TSAN_INTERCEPTOR(void,cfree,void * p)638 TSAN_INTERCEPTOR(void, cfree, void *p) {
639   if (p == 0)
640     return;
641   if (cur_thread()->in_symbolizer)
642     return InternalFree(p);
643   invoke_free_hook(p);
644   SCOPED_INTERCEPTOR_RAW(cfree, p);
645   user_free(thr, pc, p);
646 }
647 
TSAN_INTERCEPTOR(uptr,malloc_usable_size,void * p)648 TSAN_INTERCEPTOR(uptr, malloc_usable_size, void *p) {
649   SCOPED_INTERCEPTOR_RAW(malloc_usable_size, p);
650   return user_alloc_usable_size(p);
651 }
652 #endif
653 
TSAN_INTERCEPTOR(char *,strcpy,char * dst,const char * src)654 TSAN_INTERCEPTOR(char*, strcpy, char *dst, const char *src) {  // NOLINT
655   SCOPED_TSAN_INTERCEPTOR(strcpy, dst, src);  // NOLINT
656   uptr srclen = internal_strlen(src);
657   MemoryAccessRange(thr, pc, (uptr)dst, srclen + 1, true);
658   MemoryAccessRange(thr, pc, (uptr)src, srclen + 1, false);
659   return REAL(strcpy)(dst, src);  // NOLINT
660 }
661 
TSAN_INTERCEPTOR(char *,strncpy,char * dst,char * src,uptr n)662 TSAN_INTERCEPTOR(char*, strncpy, char *dst, char *src, uptr n) {
663   SCOPED_TSAN_INTERCEPTOR(strncpy, dst, src, n);
664   uptr srclen = internal_strnlen(src, n);
665   MemoryAccessRange(thr, pc, (uptr)dst, n, true);
666   MemoryAccessRange(thr, pc, (uptr)src, min(srclen + 1, n), false);
667   return REAL(strncpy)(dst, src, n);
668 }
669 
TSAN_INTERCEPTOR(char *,strdup,const char * str)670 TSAN_INTERCEPTOR(char*, strdup, const char *str) {
671   SCOPED_TSAN_INTERCEPTOR(strdup, str);
672   // strdup will call malloc, so no instrumentation is required here.
673   return REAL(strdup)(str);
674 }
675 
fix_mmap_addr(void ** addr,long_t sz,int flags)676 static bool fix_mmap_addr(void **addr, long_t sz, int flags) {
677   if (*addr) {
678     if (!IsAppMem((uptr)*addr) || !IsAppMem((uptr)*addr + sz - 1)) {
679       if (flags & MAP_FIXED) {
680         errno = EINVAL;
681         return false;
682       } else {
683         *addr = 0;
684       }
685     }
686   }
687   return true;
688 }
689 
TSAN_INTERCEPTOR(void *,mmap,void * addr,SIZE_T sz,int prot,int flags,int fd,OFF_T off)690 TSAN_INTERCEPTOR(void *, mmap, void *addr, SIZE_T sz, int prot, int flags,
691                  int fd, OFF_T off) {
692   SCOPED_TSAN_INTERCEPTOR(mmap, addr, sz, prot, flags, fd, off);
693   if (!fix_mmap_addr(&addr, sz, flags))
694     return MAP_FAILED;
695   void *res = REAL(mmap)(addr, sz, prot, flags, fd, off);
696   if (res != MAP_FAILED) {
697     if (fd > 0)
698       FdAccess(thr, pc, fd);
699 
700     if (thr->ignore_reads_and_writes == 0)
701       MemoryRangeImitateWrite(thr, pc, (uptr)res, sz);
702     else
703       MemoryResetRange(thr, pc, (uptr)res, sz);
704   }
705   return res;
706 }
707 
708 #if SANITIZER_LINUX
TSAN_INTERCEPTOR(void *,mmap64,void * addr,SIZE_T sz,int prot,int flags,int fd,OFF64_T off)709 TSAN_INTERCEPTOR(void *, mmap64, void *addr, SIZE_T sz, int prot, int flags,
710                  int fd, OFF64_T off) {
711   SCOPED_TSAN_INTERCEPTOR(mmap64, addr, sz, prot, flags, fd, off);
712   if (!fix_mmap_addr(&addr, sz, flags))
713     return MAP_FAILED;
714   void *res = REAL(mmap64)(addr, sz, prot, flags, fd, off);
715   if (res != MAP_FAILED) {
716     if (fd > 0)
717       FdAccess(thr, pc, fd);
718 
719     if (thr->ignore_reads_and_writes == 0)
720       MemoryRangeImitateWrite(thr, pc, (uptr)res, sz);
721     else
722       MemoryResetRange(thr, pc, (uptr)res, sz);
723   }
724   return res;
725 }
726 #define TSAN_MAYBE_INTERCEPT_MMAP64 TSAN_INTERCEPT(mmap64)
727 #else
728 #define TSAN_MAYBE_INTERCEPT_MMAP64
729 #endif
730 
TSAN_INTERCEPTOR(int,munmap,void * addr,long_t sz)731 TSAN_INTERCEPTOR(int, munmap, void *addr, long_t sz) {
732   SCOPED_TSAN_INTERCEPTOR(munmap, addr, sz);
733   if (sz != 0) {
734     // If sz == 0, munmap will return EINVAL and don't unmap any memory.
735     DontNeedShadowFor((uptr)addr, sz);
736     ScopedGlobalProcessor sgp;
737     ctx->metamap.ResetRange(thr->proc(), (uptr)addr, (uptr)sz);
738   }
739   int res = REAL(munmap)(addr, sz);
740   return res;
741 }
742 
743 #if SANITIZER_LINUX
TSAN_INTERCEPTOR(void *,memalign,uptr align,uptr sz)744 TSAN_INTERCEPTOR(void*, memalign, uptr align, uptr sz) {
745   SCOPED_INTERCEPTOR_RAW(memalign, align, sz);
746   return user_alloc(thr, pc, sz, align);
747 }
748 #define TSAN_MAYBE_INTERCEPT_MEMALIGN TSAN_INTERCEPT(memalign)
749 #else
750 #define TSAN_MAYBE_INTERCEPT_MEMALIGN
751 #endif
752 
753 #if !SANITIZER_MAC
TSAN_INTERCEPTOR(void *,aligned_alloc,uptr align,uptr sz)754 TSAN_INTERCEPTOR(void*, aligned_alloc, uptr align, uptr sz) {
755   SCOPED_INTERCEPTOR_RAW(memalign, align, sz);
756   return user_alloc(thr, pc, sz, align);
757 }
758 
TSAN_INTERCEPTOR(void *,valloc,uptr sz)759 TSAN_INTERCEPTOR(void*, valloc, uptr sz) {
760   SCOPED_INTERCEPTOR_RAW(valloc, sz);
761   return user_alloc(thr, pc, sz, GetPageSizeCached());
762 }
763 #endif
764 
765 #if SANITIZER_LINUX
TSAN_INTERCEPTOR(void *,pvalloc,uptr sz)766 TSAN_INTERCEPTOR(void*, pvalloc, uptr sz) {
767   SCOPED_INTERCEPTOR_RAW(pvalloc, sz);
768   sz = RoundUp(sz, GetPageSizeCached());
769   return user_alloc(thr, pc, sz, GetPageSizeCached());
770 }
771 #define TSAN_MAYBE_INTERCEPT_PVALLOC TSAN_INTERCEPT(pvalloc)
772 #else
773 #define TSAN_MAYBE_INTERCEPT_PVALLOC
774 #endif
775 
776 #if !SANITIZER_MAC
TSAN_INTERCEPTOR(int,posix_memalign,void ** memptr,uptr align,uptr sz)777 TSAN_INTERCEPTOR(int, posix_memalign, void **memptr, uptr align, uptr sz) {
778   SCOPED_INTERCEPTOR_RAW(posix_memalign, memptr, align, sz);
779   *memptr = user_alloc(thr, pc, sz, align);
780   return 0;
781 }
782 #endif
783 
784 // __cxa_guard_acquire and friends need to be intercepted in a special way -
785 // regular interceptors will break statically-linked libstdc++. Linux
786 // interceptors are especially defined as weak functions (so that they don't
787 // cause link errors when user defines them as well). So they silently
788 // auto-disable themselves when such symbol is already present in the binary. If
789 // we link libstdc++ statically, it will bring own __cxa_guard_acquire which
790 // will silently replace our interceptor.  That's why on Linux we simply export
791 // these interceptors with INTERFACE_ATTRIBUTE.
792 // On OS X, we don't support statically linking, so we just use a regular
793 // interceptor.
794 #if SANITIZER_MAC
795 #define STDCXX_INTERCEPTOR TSAN_INTERCEPTOR
796 #else
797 #define STDCXX_INTERCEPTOR(rettype, name, ...) \
798   extern "C" rettype INTERFACE_ATTRIBUTE name(__VA_ARGS__)
799 #endif
800 
801 // Used in thread-safe function static initialization.
STDCXX_INTERCEPTOR(int,__cxa_guard_acquire,atomic_uint32_t * g)802 STDCXX_INTERCEPTOR(int, __cxa_guard_acquire, atomic_uint32_t *g) {
803   SCOPED_INTERCEPTOR_RAW(__cxa_guard_acquire, g);
804   for (;;) {
805     u32 cmp = atomic_load(g, memory_order_acquire);
806     if (cmp == 0) {
807       if (atomic_compare_exchange_strong(g, &cmp, 1<<16, memory_order_relaxed))
808         return 1;
809     } else if (cmp == 1) {
810       Acquire(thr, pc, (uptr)g);
811       return 0;
812     } else {
813       internal_sched_yield();
814     }
815   }
816 }
817 
STDCXX_INTERCEPTOR(void,__cxa_guard_release,atomic_uint32_t * g)818 STDCXX_INTERCEPTOR(void, __cxa_guard_release, atomic_uint32_t *g) {
819   SCOPED_INTERCEPTOR_RAW(__cxa_guard_release, g);
820   Release(thr, pc, (uptr)g);
821   atomic_store(g, 1, memory_order_release);
822 }
823 
STDCXX_INTERCEPTOR(void,__cxa_guard_abort,atomic_uint32_t * g)824 STDCXX_INTERCEPTOR(void, __cxa_guard_abort, atomic_uint32_t *g) {
825   SCOPED_INTERCEPTOR_RAW(__cxa_guard_abort, g);
826   atomic_store(g, 0, memory_order_relaxed);
827 }
828 
829 namespace __tsan {
DestroyThreadState()830 void DestroyThreadState() {
831   ThreadState *thr = cur_thread();
832   Processor *proc = thr->proc();
833   ThreadFinish(thr);
834   ProcUnwire(proc, thr);
835   ProcDestroy(proc);
836   ThreadSignalContext *sctx = thr->signal_ctx;
837   if (sctx) {
838     thr->signal_ctx = 0;
839     UnmapOrDie(sctx, sizeof(*sctx));
840   }
841   DTLS_Destroy();
842   cur_thread_finalize();
843 }
844 }  // namespace __tsan
845 
846 #if !SANITIZER_MAC
thread_finalize(void * v)847 static void thread_finalize(void *v) {
848   uptr iter = (uptr)v;
849   if (iter > 1) {
850     if (pthread_setspecific(g_thread_finalize_key, (void*)(iter - 1))) {
851       Printf("ThreadSanitizer: failed to set thread key\n");
852       Die();
853     }
854     return;
855   }
856   DestroyThreadState();
857 }
858 #endif
859 
860 
861 struct ThreadParam {
862   void* (*callback)(void *arg);
863   void *param;
864   atomic_uintptr_t tid;
865 };
866 
__tsan_thread_start_func(void * arg)867 extern "C" void *__tsan_thread_start_func(void *arg) {
868   ThreadParam *p = (ThreadParam*)arg;
869   void* (*callback)(void *arg) = p->callback;
870   void *param = p->param;
871   int tid = 0;
872   {
873     ThreadState *thr = cur_thread();
874     // Thread-local state is not initialized yet.
875     ScopedIgnoreInterceptors ignore;
876 #if !SANITIZER_MAC
877     ThreadIgnoreBegin(thr, 0);
878     if (pthread_setspecific(g_thread_finalize_key,
879                             (void *)GetPthreadDestructorIterations())) {
880       Printf("ThreadSanitizer: failed to set thread key\n");
881       Die();
882     }
883     ThreadIgnoreEnd(thr, 0);
884 #endif
885     while ((tid = atomic_load(&p->tid, memory_order_acquire)) == 0)
886       internal_sched_yield();
887     Processor *proc = ProcCreate();
888     ProcWire(proc, thr);
889     ThreadStart(thr, tid, GetTid());
890     atomic_store(&p->tid, 0, memory_order_release);
891   }
892   void *res = callback(param);
893   // Prevent the callback from being tail called,
894   // it mixes up stack traces.
895   volatile int foo = 42;
896   foo++;
897   return res;
898 }
899 
TSAN_INTERCEPTOR(int,pthread_create,void * th,void * attr,void * (* callback)(void *),void * param)900 TSAN_INTERCEPTOR(int, pthread_create,
901     void *th, void *attr, void *(*callback)(void*), void * param) {
902   SCOPED_INTERCEPTOR_RAW(pthread_create, th, attr, callback, param);
903   if (ctx->after_multithreaded_fork) {
904     if (flags()->die_after_fork) {
905       Report("ThreadSanitizer: starting new threads after multi-threaded "
906           "fork is not supported. Dying (set die_after_fork=0 to override)\n");
907       Die();
908     } else {
909       VPrintf(1, "ThreadSanitizer: starting new threads after multi-threaded "
910           "fork is not supported (pid %d). Continuing because of "
911           "die_after_fork=0, but you are on your own\n", internal_getpid());
912     }
913   }
914   __sanitizer_pthread_attr_t myattr;
915   if (attr == 0) {
916     pthread_attr_init(&myattr);
917     attr = &myattr;
918   }
919   int detached = 0;
920   REAL(pthread_attr_getdetachstate)(attr, &detached);
921   AdjustStackSize(attr);
922 
923   ThreadParam p;
924   p.callback = callback;
925   p.param = param;
926   atomic_store(&p.tid, 0, memory_order_relaxed);
927   int res = -1;
928   {
929     // Otherwise we see false positives in pthread stack manipulation.
930     ScopedIgnoreInterceptors ignore;
931     ThreadIgnoreBegin(thr, pc);
932     res = REAL(pthread_create)(th, attr, __tsan_thread_start_func, &p);
933     ThreadIgnoreEnd(thr, pc);
934   }
935   if (res == 0) {
936     int tid = ThreadCreate(thr, pc, *(uptr*)th,
937                            detached == PTHREAD_CREATE_DETACHED);
938     CHECK_NE(tid, 0);
939     // Synchronization on p.tid serves two purposes:
940     // 1. ThreadCreate must finish before the new thread starts.
941     //    Otherwise the new thread can call pthread_detach, but the pthread_t
942     //    identifier is not yet registered in ThreadRegistry by ThreadCreate.
943     // 2. ThreadStart must finish before this thread continues.
944     //    Otherwise, this thread can call pthread_detach and reset thr->sync
945     //    before the new thread got a chance to acquire from it in ThreadStart.
946     atomic_store(&p.tid, tid, memory_order_release);
947     while (atomic_load(&p.tid, memory_order_acquire) != 0)
948       internal_sched_yield();
949   }
950   if (attr == &myattr)
951     pthread_attr_destroy(&myattr);
952   return res;
953 }
954 
TSAN_INTERCEPTOR(int,pthread_join,void * th,void ** ret)955 TSAN_INTERCEPTOR(int, pthread_join, void *th, void **ret) {
956   SCOPED_INTERCEPTOR_RAW(pthread_join, th, ret);
957   int tid = ThreadTid(thr, pc, (uptr)th);
958   ThreadIgnoreBegin(thr, pc);
959   int res = BLOCK_REAL(pthread_join)(th, ret);
960   ThreadIgnoreEnd(thr, pc);
961   if (res == 0) {
962     ThreadJoin(thr, pc, tid);
963   }
964   return res;
965 }
966 
967 DEFINE_REAL_PTHREAD_FUNCTIONS
968 
TSAN_INTERCEPTOR(int,pthread_detach,void * th)969 TSAN_INTERCEPTOR(int, pthread_detach, void *th) {
970   SCOPED_TSAN_INTERCEPTOR(pthread_detach, th);
971   int tid = ThreadTid(thr, pc, (uptr)th);
972   int res = REAL(pthread_detach)(th);
973   if (res == 0) {
974     ThreadDetach(thr, pc, tid);
975   }
976   return res;
977 }
978 
979 // Problem:
980 // NPTL implementation of pthread_cond has 2 versions (2.2.5 and 2.3.2).
981 // pthread_cond_t has different size in the different versions.
982 // If call new REAL functions for old pthread_cond_t, they will corrupt memory
983 // after pthread_cond_t (old cond is smaller).
984 // If we call old REAL functions for new pthread_cond_t, we will lose  some
985 // functionality (e.g. old functions do not support waiting against
986 // CLOCK_REALTIME).
987 // Proper handling would require to have 2 versions of interceptors as well.
988 // But this is messy, in particular requires linker scripts when sanitizer
989 // runtime is linked into a shared library.
990 // Instead we assume we don't have dynamic libraries built against old
991 // pthread (2.2.5 is dated by 2002). And provide legacy_pthread_cond flag
992 // that allows to work with old libraries (but this mode does not support
993 // some features, e.g. pthread_condattr_getpshared).
init_cond(void * c,bool force=false)994 static void *init_cond(void *c, bool force = false) {
995   // sizeof(pthread_cond_t) >= sizeof(uptr) in both versions.
996   // So we allocate additional memory on the side large enough to hold
997   // any pthread_cond_t object. Always call new REAL functions, but pass
998   // the aux object to them.
999   // Note: the code assumes that PTHREAD_COND_INITIALIZER initializes
1000   // first word of pthread_cond_t to zero.
1001   // It's all relevant only for linux.
1002   if (!common_flags()->legacy_pthread_cond)
1003     return c;
1004   atomic_uintptr_t *p = (atomic_uintptr_t*)c;
1005   uptr cond = atomic_load(p, memory_order_acquire);
1006   if (!force && cond != 0)
1007     return (void*)cond;
1008   void *newcond = WRAP(malloc)(pthread_cond_t_sz);
1009   internal_memset(newcond, 0, pthread_cond_t_sz);
1010   if (atomic_compare_exchange_strong(p, &cond, (uptr)newcond,
1011       memory_order_acq_rel))
1012     return newcond;
1013   WRAP(free)(newcond);
1014   return (void*)cond;
1015 }
1016 
1017 struct CondMutexUnlockCtx {
1018   ScopedInterceptor *si;
1019   ThreadState *thr;
1020   uptr pc;
1021   void *m;
1022 };
1023 
cond_mutex_unlock(CondMutexUnlockCtx * arg)1024 static void cond_mutex_unlock(CondMutexUnlockCtx *arg) {
1025   // pthread_cond_wait interceptor has enabled async signal delivery
1026   // (see BlockingCall below). Disable async signals since we are running
1027   // tsan code. Also ScopedInterceptor and BlockingCall destructors won't run
1028   // since the thread is cancelled, so we have to manually execute them
1029   // (the thread still can run some user code due to pthread_cleanup_push).
1030   ThreadSignalContext *ctx = SigCtx(arg->thr);
1031   CHECK_EQ(atomic_load(&ctx->in_blocking_func, memory_order_relaxed), 1);
1032   atomic_store(&ctx->in_blocking_func, 0, memory_order_relaxed);
1033   MutexLock(arg->thr, arg->pc, (uptr)arg->m);
1034   // Undo BlockingCall ctor effects.
1035   arg->thr->ignore_interceptors--;
1036   arg->si->~ScopedInterceptor();
1037 }
1038 
INTERCEPTOR(int,pthread_cond_init,void * c,void * a)1039 INTERCEPTOR(int, pthread_cond_init, void *c, void *a) {
1040   void *cond = init_cond(c, true);
1041   SCOPED_TSAN_INTERCEPTOR(pthread_cond_init, cond, a);
1042   MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), true);
1043   return REAL(pthread_cond_init)(cond, a);
1044 }
1045 
cond_wait(ThreadState * thr,uptr pc,ScopedInterceptor * si,int (* fn)(void * c,void * m,void * abstime),void * c,void * m,void * t)1046 static int cond_wait(ThreadState *thr, uptr pc, ScopedInterceptor *si,
1047                      int (*fn)(void *c, void *m, void *abstime), void *c,
1048                      void *m, void *t) {
1049   MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), false);
1050   MutexUnlock(thr, pc, (uptr)m);
1051   CondMutexUnlockCtx arg = {si, thr, pc, m};
1052   int res = 0;
1053   // This ensures that we handle mutex lock even in case of pthread_cancel.
1054   // See test/tsan/cond_cancel.cc.
1055   {
1056     // Enable signal delivery while the thread is blocked.
1057     BlockingCall bc(thr);
1058     res = call_pthread_cancel_with_cleanup(
1059         fn, c, m, t, (void (*)(void *arg))cond_mutex_unlock, &arg);
1060   }
1061   if (res == errno_EOWNERDEAD) MutexRepair(thr, pc, (uptr)m);
1062   MutexLock(thr, pc, (uptr)m);
1063   return res;
1064 }
1065 
INTERCEPTOR(int,pthread_cond_wait,void * c,void * m)1066 INTERCEPTOR(int, pthread_cond_wait, void *c, void *m) {
1067   void *cond = init_cond(c);
1068   SCOPED_TSAN_INTERCEPTOR(pthread_cond_wait, cond, m);
1069   return cond_wait(thr, pc, &si, (int (*)(void *c, void *m, void *abstime))REAL(
1070                                      pthread_cond_wait),
1071                    cond, m, 0);
1072 }
1073 
INTERCEPTOR(int,pthread_cond_timedwait,void * c,void * m,void * abstime)1074 INTERCEPTOR(int, pthread_cond_timedwait, void *c, void *m, void *abstime) {
1075   void *cond = init_cond(c);
1076   SCOPED_TSAN_INTERCEPTOR(pthread_cond_timedwait, cond, m, abstime);
1077   return cond_wait(thr, pc, &si, REAL(pthread_cond_timedwait), cond, m,
1078                    abstime);
1079 }
1080 
1081 #if SANITIZER_MAC
INTERCEPTOR(int,pthread_cond_timedwait_relative_np,void * c,void * m,void * reltime)1082 INTERCEPTOR(int, pthread_cond_timedwait_relative_np, void *c, void *m,
1083             void *reltime) {
1084   void *cond = init_cond(c);
1085   SCOPED_TSAN_INTERCEPTOR(pthread_cond_timedwait_relative_np, cond, m, reltime);
1086   return cond_wait(thr, pc, &si, REAL(pthread_cond_timedwait_relative_np), cond,
1087                    m, reltime);
1088 }
1089 #endif
1090 
INTERCEPTOR(int,pthread_cond_signal,void * c)1091 INTERCEPTOR(int, pthread_cond_signal, void *c) {
1092   void *cond = init_cond(c);
1093   SCOPED_TSAN_INTERCEPTOR(pthread_cond_signal, cond);
1094   MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), false);
1095   return REAL(pthread_cond_signal)(cond);
1096 }
1097 
INTERCEPTOR(int,pthread_cond_broadcast,void * c)1098 INTERCEPTOR(int, pthread_cond_broadcast, void *c) {
1099   void *cond = init_cond(c);
1100   SCOPED_TSAN_INTERCEPTOR(pthread_cond_broadcast, cond);
1101   MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), false);
1102   return REAL(pthread_cond_broadcast)(cond);
1103 }
1104 
INTERCEPTOR(int,pthread_cond_destroy,void * c)1105 INTERCEPTOR(int, pthread_cond_destroy, void *c) {
1106   void *cond = init_cond(c);
1107   SCOPED_TSAN_INTERCEPTOR(pthread_cond_destroy, cond);
1108   MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), true);
1109   int res = REAL(pthread_cond_destroy)(cond);
1110   if (common_flags()->legacy_pthread_cond) {
1111     // Free our aux cond and zero the pointer to not leave dangling pointers.
1112     WRAP(free)(cond);
1113     atomic_store((atomic_uintptr_t*)c, 0, memory_order_relaxed);
1114   }
1115   return res;
1116 }
1117 
TSAN_INTERCEPTOR(int,pthread_mutex_init,void * m,void * a)1118 TSAN_INTERCEPTOR(int, pthread_mutex_init, void *m, void *a) {
1119   SCOPED_TSAN_INTERCEPTOR(pthread_mutex_init, m, a);
1120   int res = REAL(pthread_mutex_init)(m, a);
1121   if (res == 0) {
1122     bool recursive = false;
1123     if (a) {
1124       int type = 0;
1125       if (REAL(pthread_mutexattr_gettype)(a, &type) == 0)
1126         recursive = (type == PTHREAD_MUTEX_RECURSIVE
1127             || type == PTHREAD_MUTEX_RECURSIVE_NP);
1128     }
1129     MutexCreate(thr, pc, (uptr)m, false, recursive, false);
1130   }
1131   return res;
1132 }
1133 
TSAN_INTERCEPTOR(int,pthread_mutex_destroy,void * m)1134 TSAN_INTERCEPTOR(int, pthread_mutex_destroy, void *m) {
1135   SCOPED_TSAN_INTERCEPTOR(pthread_mutex_destroy, m);
1136   int res = REAL(pthread_mutex_destroy)(m);
1137   if (res == 0 || res == EBUSY) {
1138     MutexDestroy(thr, pc, (uptr)m);
1139   }
1140   return res;
1141 }
1142 
TSAN_INTERCEPTOR(int,pthread_mutex_trylock,void * m)1143 TSAN_INTERCEPTOR(int, pthread_mutex_trylock, void *m) {
1144   SCOPED_TSAN_INTERCEPTOR(pthread_mutex_trylock, m);
1145   int res = REAL(pthread_mutex_trylock)(m);
1146   if (res == EOWNERDEAD)
1147     MutexRepair(thr, pc, (uptr)m);
1148   if (res == 0 || res == EOWNERDEAD)
1149     MutexLock(thr, pc, (uptr)m, /*rec=*/1, /*try_lock=*/true);
1150   return res;
1151 }
1152 
1153 #if !SANITIZER_MAC
TSAN_INTERCEPTOR(int,pthread_mutex_timedlock,void * m,void * abstime)1154 TSAN_INTERCEPTOR(int, pthread_mutex_timedlock, void *m, void *abstime) {
1155   SCOPED_TSAN_INTERCEPTOR(pthread_mutex_timedlock, m, abstime);
1156   int res = REAL(pthread_mutex_timedlock)(m, abstime);
1157   if (res == 0) {
1158     MutexLock(thr, pc, (uptr)m);
1159   }
1160   return res;
1161 }
1162 #endif
1163 
1164 #if !SANITIZER_MAC
TSAN_INTERCEPTOR(int,pthread_spin_init,void * m,int pshared)1165 TSAN_INTERCEPTOR(int, pthread_spin_init, void *m, int pshared) {
1166   SCOPED_TSAN_INTERCEPTOR(pthread_spin_init, m, pshared);
1167   int res = REAL(pthread_spin_init)(m, pshared);
1168   if (res == 0) {
1169     MutexCreate(thr, pc, (uptr)m, false, false, false);
1170   }
1171   return res;
1172 }
1173 
TSAN_INTERCEPTOR(int,pthread_spin_destroy,void * m)1174 TSAN_INTERCEPTOR(int, pthread_spin_destroy, void *m) {
1175   SCOPED_TSAN_INTERCEPTOR(pthread_spin_destroy, m);
1176   int res = REAL(pthread_spin_destroy)(m);
1177   if (res == 0) {
1178     MutexDestroy(thr, pc, (uptr)m);
1179   }
1180   return res;
1181 }
1182 
TSAN_INTERCEPTOR(int,pthread_spin_lock,void * m)1183 TSAN_INTERCEPTOR(int, pthread_spin_lock, void *m) {
1184   SCOPED_TSAN_INTERCEPTOR(pthread_spin_lock, m);
1185   int res = REAL(pthread_spin_lock)(m);
1186   if (res == 0) {
1187     MutexLock(thr, pc, (uptr)m);
1188   }
1189   return res;
1190 }
1191 
TSAN_INTERCEPTOR(int,pthread_spin_trylock,void * m)1192 TSAN_INTERCEPTOR(int, pthread_spin_trylock, void *m) {
1193   SCOPED_TSAN_INTERCEPTOR(pthread_spin_trylock, m);
1194   int res = REAL(pthread_spin_trylock)(m);
1195   if (res == 0) {
1196     MutexLock(thr, pc, (uptr)m, /*rec=*/1, /*try_lock=*/true);
1197   }
1198   return res;
1199 }
1200 
TSAN_INTERCEPTOR(int,pthread_spin_unlock,void * m)1201 TSAN_INTERCEPTOR(int, pthread_spin_unlock, void *m) {
1202   SCOPED_TSAN_INTERCEPTOR(pthread_spin_unlock, m);
1203   MutexUnlock(thr, pc, (uptr)m);
1204   int res = REAL(pthread_spin_unlock)(m);
1205   return res;
1206 }
1207 #endif
1208 
TSAN_INTERCEPTOR(int,pthread_rwlock_init,void * m,void * a)1209 TSAN_INTERCEPTOR(int, pthread_rwlock_init, void *m, void *a) {
1210   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_init, m, a);
1211   int res = REAL(pthread_rwlock_init)(m, a);
1212   if (res == 0) {
1213     MutexCreate(thr, pc, (uptr)m, true, false, false);
1214   }
1215   return res;
1216 }
1217 
TSAN_INTERCEPTOR(int,pthread_rwlock_destroy,void * m)1218 TSAN_INTERCEPTOR(int, pthread_rwlock_destroy, void *m) {
1219   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_destroy, m);
1220   int res = REAL(pthread_rwlock_destroy)(m);
1221   if (res == 0) {
1222     MutexDestroy(thr, pc, (uptr)m);
1223   }
1224   return res;
1225 }
1226 
TSAN_INTERCEPTOR(int,pthread_rwlock_rdlock,void * m)1227 TSAN_INTERCEPTOR(int, pthread_rwlock_rdlock, void *m) {
1228   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_rdlock, m);
1229   int res = REAL(pthread_rwlock_rdlock)(m);
1230   if (res == 0) {
1231     MutexReadLock(thr, pc, (uptr)m);
1232   }
1233   return res;
1234 }
1235 
TSAN_INTERCEPTOR(int,pthread_rwlock_tryrdlock,void * m)1236 TSAN_INTERCEPTOR(int, pthread_rwlock_tryrdlock, void *m) {
1237   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_tryrdlock, m);
1238   int res = REAL(pthread_rwlock_tryrdlock)(m);
1239   if (res == 0) {
1240     MutexReadLock(thr, pc, (uptr)m, /*try_lock=*/true);
1241   }
1242   return res;
1243 }
1244 
1245 #if !SANITIZER_MAC
TSAN_INTERCEPTOR(int,pthread_rwlock_timedrdlock,void * m,void * abstime)1246 TSAN_INTERCEPTOR(int, pthread_rwlock_timedrdlock, void *m, void *abstime) {
1247   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedrdlock, m, abstime);
1248   int res = REAL(pthread_rwlock_timedrdlock)(m, abstime);
1249   if (res == 0) {
1250     MutexReadLock(thr, pc, (uptr)m);
1251   }
1252   return res;
1253 }
1254 #endif
1255 
TSAN_INTERCEPTOR(int,pthread_rwlock_wrlock,void * m)1256 TSAN_INTERCEPTOR(int, pthread_rwlock_wrlock, void *m) {
1257   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_wrlock, m);
1258   int res = REAL(pthread_rwlock_wrlock)(m);
1259   if (res == 0) {
1260     MutexLock(thr, pc, (uptr)m);
1261   }
1262   return res;
1263 }
1264 
TSAN_INTERCEPTOR(int,pthread_rwlock_trywrlock,void * m)1265 TSAN_INTERCEPTOR(int, pthread_rwlock_trywrlock, void *m) {
1266   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_trywrlock, m);
1267   int res = REAL(pthread_rwlock_trywrlock)(m);
1268   if (res == 0) {
1269     MutexLock(thr, pc, (uptr)m, /*rec=*/1, /*try_lock=*/true);
1270   }
1271   return res;
1272 }
1273 
1274 #if !SANITIZER_MAC
TSAN_INTERCEPTOR(int,pthread_rwlock_timedwrlock,void * m,void * abstime)1275 TSAN_INTERCEPTOR(int, pthread_rwlock_timedwrlock, void *m, void *abstime) {
1276   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedwrlock, m, abstime);
1277   int res = REAL(pthread_rwlock_timedwrlock)(m, abstime);
1278   if (res == 0) {
1279     MutexLock(thr, pc, (uptr)m);
1280   }
1281   return res;
1282 }
1283 #endif
1284 
TSAN_INTERCEPTOR(int,pthread_rwlock_unlock,void * m)1285 TSAN_INTERCEPTOR(int, pthread_rwlock_unlock, void *m) {
1286   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_unlock, m);
1287   MutexReadOrWriteUnlock(thr, pc, (uptr)m);
1288   int res = REAL(pthread_rwlock_unlock)(m);
1289   return res;
1290 }
1291 
1292 #if !SANITIZER_MAC
TSAN_INTERCEPTOR(int,pthread_barrier_init,void * b,void * a,unsigned count)1293 TSAN_INTERCEPTOR(int, pthread_barrier_init, void *b, void *a, unsigned count) {
1294   SCOPED_TSAN_INTERCEPTOR(pthread_barrier_init, b, a, count);
1295   MemoryWrite(thr, pc, (uptr)b, kSizeLog1);
1296   int res = REAL(pthread_barrier_init)(b, a, count);
1297   return res;
1298 }
1299 
TSAN_INTERCEPTOR(int,pthread_barrier_destroy,void * b)1300 TSAN_INTERCEPTOR(int, pthread_barrier_destroy, void *b) {
1301   SCOPED_TSAN_INTERCEPTOR(pthread_barrier_destroy, b);
1302   MemoryWrite(thr, pc, (uptr)b, kSizeLog1);
1303   int res = REAL(pthread_barrier_destroy)(b);
1304   return res;
1305 }
1306 
TSAN_INTERCEPTOR(int,pthread_barrier_wait,void * b)1307 TSAN_INTERCEPTOR(int, pthread_barrier_wait, void *b) {
1308   SCOPED_TSAN_INTERCEPTOR(pthread_barrier_wait, b);
1309   Release(thr, pc, (uptr)b);
1310   MemoryRead(thr, pc, (uptr)b, kSizeLog1);
1311   int res = REAL(pthread_barrier_wait)(b);
1312   MemoryRead(thr, pc, (uptr)b, kSizeLog1);
1313   if (res == 0 || res == PTHREAD_BARRIER_SERIAL_THREAD) {
1314     Acquire(thr, pc, (uptr)b);
1315   }
1316   return res;
1317 }
1318 #endif
1319 
TSAN_INTERCEPTOR(int,pthread_once,void * o,void (* f)())1320 TSAN_INTERCEPTOR(int, pthread_once, void *o, void (*f)()) {
1321   SCOPED_INTERCEPTOR_RAW(pthread_once, o, f);
1322   if (o == 0 || f == 0)
1323     return EINVAL;
1324   atomic_uint32_t *a;
1325   if (!SANITIZER_MAC)
1326     a = static_cast<atomic_uint32_t*>(o);
1327   else  // On OS X, pthread_once_t has a header with a long-sized signature.
1328     a = static_cast<atomic_uint32_t*>((void *)((char *)o + sizeof(long_t)));
1329   u32 v = atomic_load(a, memory_order_acquire);
1330   if (v == 0 && atomic_compare_exchange_strong(a, &v, 1,
1331                                                memory_order_relaxed)) {
1332     (*f)();
1333     if (!thr->in_ignored_lib)
1334       Release(thr, pc, (uptr)o);
1335     atomic_store(a, 2, memory_order_release);
1336   } else {
1337     while (v != 2) {
1338       internal_sched_yield();
1339       v = atomic_load(a, memory_order_acquire);
1340     }
1341     if (!thr->in_ignored_lib)
1342       Acquire(thr, pc, (uptr)o);
1343   }
1344   return 0;
1345 }
1346 
1347 #if SANITIZER_LINUX && !SANITIZER_ANDROID
TSAN_INTERCEPTOR(int,__fxstat,int version,int fd,void * buf)1348 TSAN_INTERCEPTOR(int, __fxstat, int version, int fd, void *buf) {
1349   SCOPED_TSAN_INTERCEPTOR(__fxstat, version, fd, buf);
1350   if (fd > 0)
1351     FdAccess(thr, pc, fd);
1352   return REAL(__fxstat)(version, fd, buf);
1353 }
1354 #define TSAN_MAYBE_INTERCEPT___FXSTAT TSAN_INTERCEPT(__fxstat)
1355 #else
1356 #define TSAN_MAYBE_INTERCEPT___FXSTAT
1357 #endif
1358 
TSAN_INTERCEPTOR(int,fstat,int fd,void * buf)1359 TSAN_INTERCEPTOR(int, fstat, int fd, void *buf) {
1360 #if SANITIZER_FREEBSD || SANITIZER_MAC || SANITIZER_ANDROID
1361   SCOPED_TSAN_INTERCEPTOR(fstat, fd, buf);
1362   if (fd > 0)
1363     FdAccess(thr, pc, fd);
1364   return REAL(fstat)(fd, buf);
1365 #else
1366   SCOPED_TSAN_INTERCEPTOR(__fxstat, 0, fd, buf);
1367   if (fd > 0)
1368     FdAccess(thr, pc, fd);
1369   return REAL(__fxstat)(0, fd, buf);
1370 #endif
1371 }
1372 
1373 #if SANITIZER_LINUX && !SANITIZER_ANDROID
TSAN_INTERCEPTOR(int,__fxstat64,int version,int fd,void * buf)1374 TSAN_INTERCEPTOR(int, __fxstat64, int version, int fd, void *buf) {
1375   SCOPED_TSAN_INTERCEPTOR(__fxstat64, version, fd, buf);
1376   if (fd > 0)
1377     FdAccess(thr, pc, fd);
1378   return REAL(__fxstat64)(version, fd, buf);
1379 }
1380 #define TSAN_MAYBE_INTERCEPT___FXSTAT64 TSAN_INTERCEPT(__fxstat64)
1381 #else
1382 #define TSAN_MAYBE_INTERCEPT___FXSTAT64
1383 #endif
1384 
1385 #if SANITIZER_LINUX && !SANITIZER_ANDROID
TSAN_INTERCEPTOR(int,fstat64,int fd,void * buf)1386 TSAN_INTERCEPTOR(int, fstat64, int fd, void *buf) {
1387   SCOPED_TSAN_INTERCEPTOR(__fxstat64, 0, fd, buf);
1388   if (fd > 0)
1389     FdAccess(thr, pc, fd);
1390   return REAL(__fxstat64)(0, fd, buf);
1391 }
1392 #define TSAN_MAYBE_INTERCEPT_FSTAT64 TSAN_INTERCEPT(fstat64)
1393 #else
1394 #define TSAN_MAYBE_INTERCEPT_FSTAT64
1395 #endif
1396 
TSAN_INTERCEPTOR(int,open,const char * name,int flags,int mode)1397 TSAN_INTERCEPTOR(int, open, const char *name, int flags, int mode) {
1398   SCOPED_TSAN_INTERCEPTOR(open, name, flags, mode);
1399   READ_STRING(thr, pc, name, 0);
1400   int fd = REAL(open)(name, flags, mode);
1401   if (fd >= 0)
1402     FdFileCreate(thr, pc, fd);
1403   return fd;
1404 }
1405 
1406 #if SANITIZER_LINUX
TSAN_INTERCEPTOR(int,open64,const char * name,int flags,int mode)1407 TSAN_INTERCEPTOR(int, open64, const char *name, int flags, int mode) {
1408   SCOPED_TSAN_INTERCEPTOR(open64, name, flags, mode);
1409   READ_STRING(thr, pc, name, 0);
1410   int fd = REAL(open64)(name, flags, mode);
1411   if (fd >= 0)
1412     FdFileCreate(thr, pc, fd);
1413   return fd;
1414 }
1415 #define TSAN_MAYBE_INTERCEPT_OPEN64 TSAN_INTERCEPT(open64)
1416 #else
1417 #define TSAN_MAYBE_INTERCEPT_OPEN64
1418 #endif
1419 
TSAN_INTERCEPTOR(int,creat,const char * name,int mode)1420 TSAN_INTERCEPTOR(int, creat, const char *name, int mode) {
1421   SCOPED_TSAN_INTERCEPTOR(creat, name, mode);
1422   READ_STRING(thr, pc, name, 0);
1423   int fd = REAL(creat)(name, mode);
1424   if (fd >= 0)
1425     FdFileCreate(thr, pc, fd);
1426   return fd;
1427 }
1428 
1429 #if SANITIZER_LINUX
TSAN_INTERCEPTOR(int,creat64,const char * name,int mode)1430 TSAN_INTERCEPTOR(int, creat64, const char *name, int mode) {
1431   SCOPED_TSAN_INTERCEPTOR(creat64, name, mode);
1432   READ_STRING(thr, pc, name, 0);
1433   int fd = REAL(creat64)(name, mode);
1434   if (fd >= 0)
1435     FdFileCreate(thr, pc, fd);
1436   return fd;
1437 }
1438 #define TSAN_MAYBE_INTERCEPT_CREAT64 TSAN_INTERCEPT(creat64)
1439 #else
1440 #define TSAN_MAYBE_INTERCEPT_CREAT64
1441 #endif
1442 
TSAN_INTERCEPTOR(int,dup,int oldfd)1443 TSAN_INTERCEPTOR(int, dup, int oldfd) {
1444   SCOPED_TSAN_INTERCEPTOR(dup, oldfd);
1445   int newfd = REAL(dup)(oldfd);
1446   if (oldfd >= 0 && newfd >= 0 && newfd != oldfd)
1447     FdDup(thr, pc, oldfd, newfd, true);
1448   return newfd;
1449 }
1450 
TSAN_INTERCEPTOR(int,dup2,int oldfd,int newfd)1451 TSAN_INTERCEPTOR(int, dup2, int oldfd, int newfd) {
1452   SCOPED_TSAN_INTERCEPTOR(dup2, oldfd, newfd);
1453   int newfd2 = REAL(dup2)(oldfd, newfd);
1454   if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
1455     FdDup(thr, pc, oldfd, newfd2, false);
1456   return newfd2;
1457 }
1458 
1459 #if !SANITIZER_MAC
TSAN_INTERCEPTOR(int,dup3,int oldfd,int newfd,int flags)1460 TSAN_INTERCEPTOR(int, dup3, int oldfd, int newfd, int flags) {
1461   SCOPED_TSAN_INTERCEPTOR(dup3, oldfd, newfd, flags);
1462   int newfd2 = REAL(dup3)(oldfd, newfd, flags);
1463   if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
1464     FdDup(thr, pc, oldfd, newfd2, false);
1465   return newfd2;
1466 }
1467 #endif
1468 
1469 #if SANITIZER_LINUX
TSAN_INTERCEPTOR(int,eventfd,unsigned initval,int flags)1470 TSAN_INTERCEPTOR(int, eventfd, unsigned initval, int flags) {
1471   SCOPED_TSAN_INTERCEPTOR(eventfd, initval, flags);
1472   int fd = REAL(eventfd)(initval, flags);
1473   if (fd >= 0)
1474     FdEventCreate(thr, pc, fd);
1475   return fd;
1476 }
1477 #define TSAN_MAYBE_INTERCEPT_EVENTFD TSAN_INTERCEPT(eventfd)
1478 #else
1479 #define TSAN_MAYBE_INTERCEPT_EVENTFD
1480 #endif
1481 
1482 #if SANITIZER_LINUX
TSAN_INTERCEPTOR(int,signalfd,int fd,void * mask,int flags)1483 TSAN_INTERCEPTOR(int, signalfd, int fd, void *mask, int flags) {
1484   SCOPED_TSAN_INTERCEPTOR(signalfd, fd, mask, flags);
1485   if (fd >= 0)
1486     FdClose(thr, pc, fd);
1487   fd = REAL(signalfd)(fd, mask, flags);
1488   if (fd >= 0)
1489     FdSignalCreate(thr, pc, fd);
1490   return fd;
1491 }
1492 #define TSAN_MAYBE_INTERCEPT_SIGNALFD TSAN_INTERCEPT(signalfd)
1493 #else
1494 #define TSAN_MAYBE_INTERCEPT_SIGNALFD
1495 #endif
1496 
1497 #if SANITIZER_LINUX
TSAN_INTERCEPTOR(int,inotify_init,int fake)1498 TSAN_INTERCEPTOR(int, inotify_init, int fake) {
1499   SCOPED_TSAN_INTERCEPTOR(inotify_init, fake);
1500   int fd = REAL(inotify_init)(fake);
1501   if (fd >= 0)
1502     FdInotifyCreate(thr, pc, fd);
1503   return fd;
1504 }
1505 #define TSAN_MAYBE_INTERCEPT_INOTIFY_INIT TSAN_INTERCEPT(inotify_init)
1506 #else
1507 #define TSAN_MAYBE_INTERCEPT_INOTIFY_INIT
1508 #endif
1509 
1510 #if SANITIZER_LINUX
TSAN_INTERCEPTOR(int,inotify_init1,int flags)1511 TSAN_INTERCEPTOR(int, inotify_init1, int flags) {
1512   SCOPED_TSAN_INTERCEPTOR(inotify_init1, flags);
1513   int fd = REAL(inotify_init1)(flags);
1514   if (fd >= 0)
1515     FdInotifyCreate(thr, pc, fd);
1516   return fd;
1517 }
1518 #define TSAN_MAYBE_INTERCEPT_INOTIFY_INIT1 TSAN_INTERCEPT(inotify_init1)
1519 #else
1520 #define TSAN_MAYBE_INTERCEPT_INOTIFY_INIT1
1521 #endif
1522 
TSAN_INTERCEPTOR(int,socket,int domain,int type,int protocol)1523 TSAN_INTERCEPTOR(int, socket, int domain, int type, int protocol) {
1524   SCOPED_TSAN_INTERCEPTOR(socket, domain, type, protocol);
1525   int fd = REAL(socket)(domain, type, protocol);
1526   if (fd >= 0)
1527     FdSocketCreate(thr, pc, fd);
1528   return fd;
1529 }
1530 
TSAN_INTERCEPTOR(int,socketpair,int domain,int type,int protocol,int * fd)1531 TSAN_INTERCEPTOR(int, socketpair, int domain, int type, int protocol, int *fd) {
1532   SCOPED_TSAN_INTERCEPTOR(socketpair, domain, type, protocol, fd);
1533   int res = REAL(socketpair)(domain, type, protocol, fd);
1534   if (res == 0 && fd[0] >= 0 && fd[1] >= 0)
1535     FdPipeCreate(thr, pc, fd[0], fd[1]);
1536   return res;
1537 }
1538 
TSAN_INTERCEPTOR(int,connect,int fd,void * addr,unsigned addrlen)1539 TSAN_INTERCEPTOR(int, connect, int fd, void *addr, unsigned addrlen) {
1540   SCOPED_TSAN_INTERCEPTOR(connect, fd, addr, addrlen);
1541   FdSocketConnecting(thr, pc, fd);
1542   int res = REAL(connect)(fd, addr, addrlen);
1543   if (res == 0 && fd >= 0)
1544     FdSocketConnect(thr, pc, fd);
1545   return res;
1546 }
1547 
TSAN_INTERCEPTOR(int,bind,int fd,void * addr,unsigned addrlen)1548 TSAN_INTERCEPTOR(int, bind, int fd, void *addr, unsigned addrlen) {
1549   SCOPED_TSAN_INTERCEPTOR(bind, fd, addr, addrlen);
1550   int res = REAL(bind)(fd, addr, addrlen);
1551   if (fd > 0 && res == 0)
1552     FdAccess(thr, pc, fd);
1553   return res;
1554 }
1555 
TSAN_INTERCEPTOR(int,listen,int fd,int backlog)1556 TSAN_INTERCEPTOR(int, listen, int fd, int backlog) {
1557   SCOPED_TSAN_INTERCEPTOR(listen, fd, backlog);
1558   int res = REAL(listen)(fd, backlog);
1559   if (fd > 0 && res == 0)
1560     FdAccess(thr, pc, fd);
1561   return res;
1562 }
1563 
TSAN_INTERCEPTOR(int,close,int fd)1564 TSAN_INTERCEPTOR(int, close, int fd) {
1565   SCOPED_TSAN_INTERCEPTOR(close, fd);
1566   if (fd >= 0)
1567     FdClose(thr, pc, fd);
1568   return REAL(close)(fd);
1569 }
1570 
1571 #if SANITIZER_LINUX
TSAN_INTERCEPTOR(int,__close,int fd)1572 TSAN_INTERCEPTOR(int, __close, int fd) {
1573   SCOPED_TSAN_INTERCEPTOR(__close, fd);
1574   if (fd >= 0)
1575     FdClose(thr, pc, fd);
1576   return REAL(__close)(fd);
1577 }
1578 #define TSAN_MAYBE_INTERCEPT___CLOSE TSAN_INTERCEPT(__close)
1579 #else
1580 #define TSAN_MAYBE_INTERCEPT___CLOSE
1581 #endif
1582 
1583 // glibc guts
1584 #if SANITIZER_LINUX && !SANITIZER_ANDROID
TSAN_INTERCEPTOR(void,__res_iclose,void * state,bool free_addr)1585 TSAN_INTERCEPTOR(void, __res_iclose, void *state, bool free_addr) {
1586   SCOPED_TSAN_INTERCEPTOR(__res_iclose, state, free_addr);
1587   int fds[64];
1588   int cnt = ExtractResolvFDs(state, fds, ARRAY_SIZE(fds));
1589   for (int i = 0; i < cnt; i++) {
1590     if (fds[i] > 0)
1591       FdClose(thr, pc, fds[i]);
1592   }
1593   REAL(__res_iclose)(state, free_addr);
1594 }
1595 #define TSAN_MAYBE_INTERCEPT___RES_ICLOSE TSAN_INTERCEPT(__res_iclose)
1596 #else
1597 #define TSAN_MAYBE_INTERCEPT___RES_ICLOSE
1598 #endif
1599 
TSAN_INTERCEPTOR(int,pipe,int * pipefd)1600 TSAN_INTERCEPTOR(int, pipe, int *pipefd) {
1601   SCOPED_TSAN_INTERCEPTOR(pipe, pipefd);
1602   int res = REAL(pipe)(pipefd);
1603   if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
1604     FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
1605   return res;
1606 }
1607 
1608 #if !SANITIZER_MAC
TSAN_INTERCEPTOR(int,pipe2,int * pipefd,int flags)1609 TSAN_INTERCEPTOR(int, pipe2, int *pipefd, int flags) {
1610   SCOPED_TSAN_INTERCEPTOR(pipe2, pipefd, flags);
1611   int res = REAL(pipe2)(pipefd, flags);
1612   if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
1613     FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
1614   return res;
1615 }
1616 #endif
1617 
TSAN_INTERCEPTOR(int,unlink,char * path)1618 TSAN_INTERCEPTOR(int, unlink, char *path) {
1619   SCOPED_TSAN_INTERCEPTOR(unlink, path);
1620   Release(thr, pc, File2addr(path));
1621   int res = REAL(unlink)(path);
1622   return res;
1623 }
1624 
TSAN_INTERCEPTOR(void *,tmpfile,int fake)1625 TSAN_INTERCEPTOR(void*, tmpfile, int fake) {
1626   SCOPED_TSAN_INTERCEPTOR(tmpfile, fake);
1627   void *res = REAL(tmpfile)(fake);
1628   if (res) {
1629     int fd = fileno_unlocked(res);
1630     if (fd >= 0)
1631       FdFileCreate(thr, pc, fd);
1632   }
1633   return res;
1634 }
1635 
1636 #if SANITIZER_LINUX
TSAN_INTERCEPTOR(void *,tmpfile64,int fake)1637 TSAN_INTERCEPTOR(void*, tmpfile64, int fake) {
1638   SCOPED_TSAN_INTERCEPTOR(tmpfile64, fake);
1639   void *res = REAL(tmpfile64)(fake);
1640   if (res) {
1641     int fd = fileno_unlocked(res);
1642     if (fd >= 0)
1643       FdFileCreate(thr, pc, fd);
1644   }
1645   return res;
1646 }
1647 #define TSAN_MAYBE_INTERCEPT_TMPFILE64 TSAN_INTERCEPT(tmpfile64)
1648 #else
1649 #define TSAN_MAYBE_INTERCEPT_TMPFILE64
1650 #endif
1651 
TSAN_INTERCEPTOR(uptr,fread,void * ptr,uptr size,uptr nmemb,void * f)1652 TSAN_INTERCEPTOR(uptr, fread, void *ptr, uptr size, uptr nmemb, void *f) {
1653   // libc file streams can call user-supplied functions, see fopencookie.
1654   {
1655     SCOPED_TSAN_INTERCEPTOR(fread, ptr, size, nmemb, f);
1656     MemoryAccessRange(thr, pc, (uptr)ptr, size * nmemb, true);
1657   }
1658   return REAL(fread)(ptr, size, nmemb, f);
1659 }
1660 
TSAN_INTERCEPTOR(uptr,fwrite,const void * p,uptr size,uptr nmemb,void * f)1661 TSAN_INTERCEPTOR(uptr, fwrite, const void *p, uptr size, uptr nmemb, void *f) {
1662   // libc file streams can call user-supplied functions, see fopencookie.
1663   {
1664     SCOPED_TSAN_INTERCEPTOR(fwrite, p, size, nmemb, f);
1665     MemoryAccessRange(thr, pc, (uptr)p, size * nmemb, false);
1666   }
1667   return REAL(fwrite)(p, size, nmemb, f);
1668 }
1669 
FlushStreams()1670 static void FlushStreams() {
1671   // Flushing all the streams here may freeze the process if a child thread is
1672   // performing file stream operations at the same time.
1673   REAL(fflush)(stdout);
1674   REAL(fflush)(stderr);
1675 }
1676 
TSAN_INTERCEPTOR(void,abort,int fake)1677 TSAN_INTERCEPTOR(void, abort, int fake) {
1678   SCOPED_TSAN_INTERCEPTOR(abort, fake);
1679   FlushStreams();
1680   REAL(abort)(fake);
1681 }
1682 
TSAN_INTERCEPTOR(int,puts,const char * s)1683 TSAN_INTERCEPTOR(int, puts, const char *s) {
1684   SCOPED_TSAN_INTERCEPTOR(puts, s);
1685   MemoryAccessRange(thr, pc, (uptr)s, internal_strlen(s), false);
1686   return REAL(puts)(s);
1687 }
1688 
TSAN_INTERCEPTOR(int,rmdir,char * path)1689 TSAN_INTERCEPTOR(int, rmdir, char *path) {
1690   SCOPED_TSAN_INTERCEPTOR(rmdir, path);
1691   Release(thr, pc, Dir2addr(path));
1692   int res = REAL(rmdir)(path);
1693   return res;
1694 }
1695 
TSAN_INTERCEPTOR(int,closedir,void * dirp)1696 TSAN_INTERCEPTOR(int, closedir, void *dirp) {
1697   SCOPED_TSAN_INTERCEPTOR(closedir, dirp);
1698   if (dirp) {
1699     int fd = dirfd(dirp);
1700     FdClose(thr, pc, fd);
1701   }
1702   return REAL(closedir)(dirp);
1703 }
1704 
1705 #if SANITIZER_LINUX
TSAN_INTERCEPTOR(int,epoll_create,int size)1706 TSAN_INTERCEPTOR(int, epoll_create, int size) {
1707   SCOPED_TSAN_INTERCEPTOR(epoll_create, size);
1708   int fd = REAL(epoll_create)(size);
1709   if (fd >= 0)
1710     FdPollCreate(thr, pc, fd);
1711   return fd;
1712 }
1713 
TSAN_INTERCEPTOR(int,epoll_create1,int flags)1714 TSAN_INTERCEPTOR(int, epoll_create1, int flags) {
1715   SCOPED_TSAN_INTERCEPTOR(epoll_create1, flags);
1716   int fd = REAL(epoll_create1)(flags);
1717   if (fd >= 0)
1718     FdPollCreate(thr, pc, fd);
1719   return fd;
1720 }
1721 
TSAN_INTERCEPTOR(int,epoll_ctl,int epfd,int op,int fd,void * ev)1722 TSAN_INTERCEPTOR(int, epoll_ctl, int epfd, int op, int fd, void *ev) {
1723   SCOPED_TSAN_INTERCEPTOR(epoll_ctl, epfd, op, fd, ev);
1724   if (epfd >= 0)
1725     FdAccess(thr, pc, epfd);
1726   if (epfd >= 0 && fd >= 0)
1727     FdAccess(thr, pc, fd);
1728   if (op == EPOLL_CTL_ADD && epfd >= 0)
1729     FdRelease(thr, pc, epfd);
1730   int res = REAL(epoll_ctl)(epfd, op, fd, ev);
1731   return res;
1732 }
1733 
TSAN_INTERCEPTOR(int,epoll_wait,int epfd,void * ev,int cnt,int timeout)1734 TSAN_INTERCEPTOR(int, epoll_wait, int epfd, void *ev, int cnt, int timeout) {
1735   SCOPED_TSAN_INTERCEPTOR(epoll_wait, epfd, ev, cnt, timeout);
1736   if (epfd >= 0)
1737     FdAccess(thr, pc, epfd);
1738   int res = BLOCK_REAL(epoll_wait)(epfd, ev, cnt, timeout);
1739   if (res > 0 && epfd >= 0)
1740     FdAcquire(thr, pc, epfd);
1741   return res;
1742 }
1743 
TSAN_INTERCEPTOR(int,epoll_pwait,int epfd,void * ev,int cnt,int timeout,void * sigmask)1744 TSAN_INTERCEPTOR(int, epoll_pwait, int epfd, void *ev, int cnt, int timeout,
1745                  void *sigmask) {
1746   SCOPED_TSAN_INTERCEPTOR(epoll_pwait, epfd, ev, cnt, timeout, sigmask);
1747   if (epfd >= 0)
1748     FdAccess(thr, pc, epfd);
1749   int res = BLOCK_REAL(epoll_pwait)(epfd, ev, cnt, timeout, sigmask);
1750   if (res > 0 && epfd >= 0)
1751     FdAcquire(thr, pc, epfd);
1752   return res;
1753 }
1754 
1755 #define TSAN_MAYBE_INTERCEPT_EPOLL \
1756     TSAN_INTERCEPT(epoll_create); \
1757     TSAN_INTERCEPT(epoll_create1); \
1758     TSAN_INTERCEPT(epoll_ctl); \
1759     TSAN_INTERCEPT(epoll_wait); \
1760     TSAN_INTERCEPT(epoll_pwait)
1761 #else
1762 #define TSAN_MAYBE_INTERCEPT_EPOLL
1763 #endif
1764 
1765 namespace __tsan {
1766 
CallUserSignalHandler(ThreadState * thr,bool sync,bool acquire,bool sigact,int sig,my_siginfo_t * info,void * uctx)1767 static void CallUserSignalHandler(ThreadState *thr, bool sync, bool acquire,
1768     bool sigact, int sig, my_siginfo_t *info, void *uctx) {
1769   if (acquire)
1770     Acquire(thr, 0, (uptr)&sigactions[sig]);
1771   // Signals are generally asynchronous, so if we receive a signals when
1772   // ignores are enabled we should disable ignores. This is critical for sync
1773   // and interceptors, because otherwise we can miss syncronization and report
1774   // false races.
1775   int ignore_reads_and_writes = thr->ignore_reads_and_writes;
1776   int ignore_interceptors = thr->ignore_interceptors;
1777   int ignore_sync = thr->ignore_sync;
1778   if (!ctx->after_multithreaded_fork) {
1779     thr->ignore_reads_and_writes = 0;
1780     thr->fast_state.ClearIgnoreBit();
1781     thr->ignore_interceptors = 0;
1782     thr->ignore_sync = 0;
1783   }
1784   // Ensure that the handler does not spoil errno.
1785   const int saved_errno = errno;
1786   errno = 99;
1787   // This code races with sigaction. Be careful to not read sa_sigaction twice.
1788   // Also need to remember pc for reporting before the call,
1789   // because the handler can reset it.
1790   volatile uptr pc = sigact ?
1791      (uptr)sigactions[sig].sa_sigaction :
1792      (uptr)sigactions[sig].sa_handler;
1793   if (pc != (uptr)SIG_DFL && pc != (uptr)SIG_IGN) {
1794     if (sigact)
1795       ((sigactionhandler_t)pc)(sig, info, uctx);
1796     else
1797       ((sighandler_t)pc)(sig);
1798   }
1799   if (!ctx->after_multithreaded_fork) {
1800     thr->ignore_reads_and_writes = ignore_reads_and_writes;
1801     if (ignore_reads_and_writes)
1802       thr->fast_state.SetIgnoreBit();
1803     thr->ignore_interceptors = ignore_interceptors;
1804     thr->ignore_sync = ignore_sync;
1805   }
1806   // We do not detect errno spoiling for SIGTERM,
1807   // because some SIGTERM handlers do spoil errno but reraise SIGTERM,
1808   // tsan reports false positive in such case.
1809   // It's difficult to properly detect this situation (reraise),
1810   // because in async signal processing case (when handler is called directly
1811   // from rtl_generic_sighandler) we have not yet received the reraised
1812   // signal; and it looks too fragile to intercept all ways to reraise a signal.
1813   if (flags()->report_bugs && !sync && sig != SIGTERM && errno != 99) {
1814     VarSizeStackTrace stack;
1815     // StackTrace::GetNestInstructionPc(pc) is used because return address is
1816     // expected, OutputReport() will undo this.
1817     ObtainCurrentStack(thr, StackTrace::GetNextInstructionPc(pc), &stack);
1818     ThreadRegistryLock l(ctx->thread_registry);
1819     ScopedReport rep(ReportTypeErrnoInSignal);
1820     if (!IsFiredSuppression(ctx, ReportTypeErrnoInSignal, stack)) {
1821       rep.AddStack(stack, true);
1822       OutputReport(thr, rep);
1823     }
1824   }
1825   errno = saved_errno;
1826 }
1827 
ProcessPendingSignals(ThreadState * thr)1828 void ProcessPendingSignals(ThreadState *thr) {
1829   ThreadSignalContext *sctx = SigCtx(thr);
1830   if (sctx == 0 ||
1831       atomic_load(&sctx->have_pending_signals, memory_order_relaxed) == 0)
1832     return;
1833   atomic_store(&sctx->have_pending_signals, 0, memory_order_relaxed);
1834   atomic_fetch_add(&thr->in_signal_handler, 1, memory_order_relaxed);
1835   internal_sigfillset(&sctx->emptyset);
1836   CHECK_EQ(0, pthread_sigmask(SIG_SETMASK, &sctx->emptyset, &sctx->oldset));
1837   for (int sig = 0; sig < kSigCount; sig++) {
1838     SignalDesc *signal = &sctx->pending_signals[sig];
1839     if (signal->armed) {
1840       signal->armed = false;
1841       CallUserSignalHandler(thr, false, true, signal->sigaction, sig,
1842           &signal->siginfo, &signal->ctx);
1843     }
1844   }
1845   CHECK_EQ(0, pthread_sigmask(SIG_SETMASK, &sctx->oldset, 0));
1846   atomic_fetch_add(&thr->in_signal_handler, -1, memory_order_relaxed);
1847 }
1848 
1849 }  // namespace __tsan
1850 
is_sync_signal(ThreadSignalContext * sctx,int sig)1851 static bool is_sync_signal(ThreadSignalContext *sctx, int sig) {
1852   return sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
1853       sig == SIGABRT || sig == SIGFPE || sig == SIGPIPE || sig == SIGSYS ||
1854       // If we are sending signal to ourselves, we must process it now.
1855       (sctx && sig == sctx->int_signal_send);
1856 }
1857 
rtl_generic_sighandler(bool sigact,int sig,my_siginfo_t * info,void * ctx)1858 void ALWAYS_INLINE rtl_generic_sighandler(bool sigact, int sig,
1859     my_siginfo_t *info, void *ctx) {
1860   ThreadState *thr = cur_thread();
1861   ThreadSignalContext *sctx = SigCtx(thr);
1862   if (sig < 0 || sig >= kSigCount) {
1863     VPrintf(1, "ThreadSanitizer: ignoring signal %d\n", sig);
1864     return;
1865   }
1866   // Don't mess with synchronous signals.
1867   const bool sync = is_sync_signal(sctx, sig);
1868   if (sync ||
1869       // If we are in blocking function, we can safely process it now
1870       // (but check if we are in a recursive interceptor,
1871       // i.e. pthread_join()->munmap()).
1872       (sctx && atomic_load(&sctx->in_blocking_func, memory_order_relaxed))) {
1873     atomic_fetch_add(&thr->in_signal_handler, 1, memory_order_relaxed);
1874     if (sctx && atomic_load(&sctx->in_blocking_func, memory_order_relaxed)) {
1875       atomic_store(&sctx->in_blocking_func, 0, memory_order_relaxed);
1876       CallUserSignalHandler(thr, sync, true, sigact, sig, info, ctx);
1877       atomic_store(&sctx->in_blocking_func, 1, memory_order_relaxed);
1878     } else {
1879       // Be very conservative with when we do acquire in this case.
1880       // It's unsafe to do acquire in async handlers, because ThreadState
1881       // can be in inconsistent state.
1882       // SIGSYS looks relatively safe -- it's synchronous and can actually
1883       // need some global state.
1884       bool acq = (sig == SIGSYS);
1885       CallUserSignalHandler(thr, sync, acq, sigact, sig, info, ctx);
1886     }
1887     atomic_fetch_add(&thr->in_signal_handler, -1, memory_order_relaxed);
1888     return;
1889   }
1890 
1891   if (sctx == 0)
1892     return;
1893   SignalDesc *signal = &sctx->pending_signals[sig];
1894   if (signal->armed == false) {
1895     signal->armed = true;
1896     signal->sigaction = sigact;
1897     if (info)
1898       internal_memcpy(&signal->siginfo, info, sizeof(*info));
1899     if (ctx)
1900       internal_memcpy(&signal->ctx, ctx, sizeof(signal->ctx));
1901     atomic_store(&sctx->have_pending_signals, 1, memory_order_relaxed);
1902   }
1903 }
1904 
rtl_sighandler(int sig)1905 static void rtl_sighandler(int sig) {
1906   rtl_generic_sighandler(false, sig, 0, 0);
1907 }
1908 
rtl_sigaction(int sig,my_siginfo_t * info,void * ctx)1909 static void rtl_sigaction(int sig, my_siginfo_t *info, void *ctx) {
1910   rtl_generic_sighandler(true, sig, info, ctx);
1911 }
1912 
TSAN_INTERCEPTOR(int,sigaction,int sig,sigaction_t * act,sigaction_t * old)1913 TSAN_INTERCEPTOR(int, sigaction, int sig, sigaction_t *act, sigaction_t *old) {
1914   // Note: if we call REAL(sigaction) directly for any reason without proxying
1915   // the signal handler through rtl_sigaction, very bad things will happen.
1916   // The handler will run synchronously and corrupt tsan per-thread state.
1917   SCOPED_INTERCEPTOR_RAW(sigaction, sig, act, old);
1918   if (old)
1919     internal_memcpy(old, &sigactions[sig], sizeof(*old));
1920   if (act == 0)
1921     return 0;
1922   // Copy act into sigactions[sig].
1923   // Can't use struct copy, because compiler can emit call to memcpy.
1924   // Can't use internal_memcpy, because it copies byte-by-byte,
1925   // and signal handler reads the sa_handler concurrently. It it can read
1926   // some bytes from old value and some bytes from new value.
1927   // Use volatile to prevent insertion of memcpy.
1928   sigactions[sig].sa_handler = *(volatile sighandler_t*)&act->sa_handler;
1929   sigactions[sig].sa_flags = *(volatile int*)&act->sa_flags;
1930   internal_memcpy(&sigactions[sig].sa_mask, &act->sa_mask,
1931       sizeof(sigactions[sig].sa_mask));
1932 #if !SANITIZER_FREEBSD && !SANITIZER_MAC
1933   sigactions[sig].sa_restorer = act->sa_restorer;
1934 #endif
1935   sigaction_t newact;
1936   internal_memcpy(&newact, act, sizeof(newact));
1937   internal_sigfillset(&newact.sa_mask);
1938   if (act->sa_handler != SIG_IGN && act->sa_handler != SIG_DFL) {
1939     if (newact.sa_flags & SA_SIGINFO)
1940       newact.sa_sigaction = rtl_sigaction;
1941     else
1942       newact.sa_handler = rtl_sighandler;
1943   }
1944   ReleaseStore(thr, pc, (uptr)&sigactions[sig]);
1945   int res = REAL(sigaction)(sig, &newact, 0);
1946   return res;
1947 }
1948 
TSAN_INTERCEPTOR(sighandler_t,signal,int sig,sighandler_t h)1949 TSAN_INTERCEPTOR(sighandler_t, signal, int sig, sighandler_t h) {
1950   sigaction_t act;
1951   act.sa_handler = h;
1952   internal_memset(&act.sa_mask, -1, sizeof(act.sa_mask));
1953   act.sa_flags = 0;
1954   sigaction_t old;
1955   int res = sigaction(sig, &act, &old);
1956   if (res)
1957     return SIG_ERR;
1958   return old.sa_handler;
1959 }
1960 
TSAN_INTERCEPTOR(int,sigsuspend,const __sanitizer_sigset_t * mask)1961 TSAN_INTERCEPTOR(int, sigsuspend, const __sanitizer_sigset_t *mask) {
1962   SCOPED_TSAN_INTERCEPTOR(sigsuspend, mask);
1963   return REAL(sigsuspend)(mask);
1964 }
1965 
TSAN_INTERCEPTOR(int,raise,int sig)1966 TSAN_INTERCEPTOR(int, raise, int sig) {
1967   SCOPED_TSAN_INTERCEPTOR(raise, sig);
1968   ThreadSignalContext *sctx = SigCtx(thr);
1969   CHECK_NE(sctx, 0);
1970   int prev = sctx->int_signal_send;
1971   sctx->int_signal_send = sig;
1972   int res = REAL(raise)(sig);
1973   CHECK_EQ(sctx->int_signal_send, sig);
1974   sctx->int_signal_send = prev;
1975   return res;
1976 }
1977 
TSAN_INTERCEPTOR(int,kill,int pid,int sig)1978 TSAN_INTERCEPTOR(int, kill, int pid, int sig) {
1979   SCOPED_TSAN_INTERCEPTOR(kill, pid, sig);
1980   ThreadSignalContext *sctx = SigCtx(thr);
1981   CHECK_NE(sctx, 0);
1982   int prev = sctx->int_signal_send;
1983   if (pid == (int)internal_getpid()) {
1984     sctx->int_signal_send = sig;
1985   }
1986   int res = REAL(kill)(pid, sig);
1987   if (pid == (int)internal_getpid()) {
1988     CHECK_EQ(sctx->int_signal_send, sig);
1989     sctx->int_signal_send = prev;
1990   }
1991   return res;
1992 }
1993 
TSAN_INTERCEPTOR(int,pthread_kill,void * tid,int sig)1994 TSAN_INTERCEPTOR(int, pthread_kill, void *tid, int sig) {
1995   SCOPED_TSAN_INTERCEPTOR(pthread_kill, tid, sig);
1996   ThreadSignalContext *sctx = SigCtx(thr);
1997   CHECK_NE(sctx, 0);
1998   int prev = sctx->int_signal_send;
1999   if (tid == pthread_self()) {
2000     sctx->int_signal_send = sig;
2001   }
2002   int res = REAL(pthread_kill)(tid, sig);
2003   if (tid == pthread_self()) {
2004     CHECK_EQ(sctx->int_signal_send, sig);
2005     sctx->int_signal_send = prev;
2006   }
2007   return res;
2008 }
2009 
TSAN_INTERCEPTOR(int,gettimeofday,void * tv,void * tz)2010 TSAN_INTERCEPTOR(int, gettimeofday, void *tv, void *tz) {
2011   SCOPED_TSAN_INTERCEPTOR(gettimeofday, tv, tz);
2012   // It's intercepted merely to process pending signals.
2013   return REAL(gettimeofday)(tv, tz);
2014 }
2015 
TSAN_INTERCEPTOR(int,getaddrinfo,void * node,void * service,void * hints,void * rv)2016 TSAN_INTERCEPTOR(int, getaddrinfo, void *node, void *service,
2017     void *hints, void *rv) {
2018   SCOPED_TSAN_INTERCEPTOR(getaddrinfo, node, service, hints, rv);
2019   // We miss atomic synchronization in getaddrinfo,
2020   // and can report false race between malloc and free
2021   // inside of getaddrinfo. So ignore memory accesses.
2022   ThreadIgnoreBegin(thr, pc);
2023   int res = REAL(getaddrinfo)(node, service, hints, rv);
2024   ThreadIgnoreEnd(thr, pc);
2025   return res;
2026 }
2027 
TSAN_INTERCEPTOR(int,fork,int fake)2028 TSAN_INTERCEPTOR(int, fork, int fake) {
2029   if (cur_thread()->in_symbolizer)
2030     return REAL(fork)(fake);
2031   SCOPED_INTERCEPTOR_RAW(fork, fake);
2032   ForkBefore(thr, pc);
2033   int pid;
2034   {
2035     // On OS X, REAL(fork) can call intercepted functions (OSSpinLockLock), and
2036     // we'll assert in CheckNoLocks() unless we ignore interceptors.
2037     ScopedIgnoreInterceptors ignore;
2038     pid = REAL(fork)(fake);
2039   }
2040   if (pid == 0) {
2041     // child
2042     ForkChildAfter(thr, pc);
2043     FdOnFork(thr, pc);
2044   } else if (pid > 0) {
2045     // parent
2046     ForkParentAfter(thr, pc);
2047   } else {
2048     // error
2049     ForkParentAfter(thr, pc);
2050   }
2051   return pid;
2052 }
2053 
TSAN_INTERCEPTOR(int,vfork,int fake)2054 TSAN_INTERCEPTOR(int, vfork, int fake) {
2055   // Some programs (e.g. openjdk) call close for all file descriptors
2056   // in the child process. Under tsan it leads to false positives, because
2057   // address space is shared, so the parent process also thinks that
2058   // the descriptors are closed (while they are actually not).
2059   // This leads to false positives due to missed synchronization.
2060   // Strictly saying this is undefined behavior, because vfork child is not
2061   // allowed to call any functions other than exec/exit. But this is what
2062   // openjdk does, so we want to handle it.
2063   // We could disable interceptors in the child process. But it's not possible
2064   // to simply intercept and wrap vfork, because vfork child is not allowed
2065   // to return from the function that calls vfork, and that's exactly what
2066   // we would do. So this would require some assembly trickery as well.
2067   // Instead we simply turn vfork into fork.
2068   return WRAP(fork)(fake);
2069 }
2070 
2071 #if !SANITIZER_MAC && !SANITIZER_ANDROID
2072 typedef int (*dl_iterate_phdr_cb_t)(__sanitizer_dl_phdr_info *info, SIZE_T size,
2073                                     void *data);
2074 struct dl_iterate_phdr_data {
2075   ThreadState *thr;
2076   uptr pc;
2077   dl_iterate_phdr_cb_t cb;
2078   void *data;
2079 };
2080 
IsAppNotRodata(uptr addr)2081 static bool IsAppNotRodata(uptr addr) {
2082   return IsAppMem(addr) && *(u64*)MemToShadow(addr) != kShadowRodata;
2083 }
2084 
dl_iterate_phdr_cb(__sanitizer_dl_phdr_info * info,SIZE_T size,void * data)2085 static int dl_iterate_phdr_cb(__sanitizer_dl_phdr_info *info, SIZE_T size,
2086                               void *data) {
2087   dl_iterate_phdr_data *cbdata = (dl_iterate_phdr_data *)data;
2088   // dlopen/dlclose allocate/free dynamic-linker-internal memory, which is later
2089   // accessible in dl_iterate_phdr callback. But we don't see synchronization
2090   // inside of dynamic linker, so we "unpoison" it here in order to not
2091   // produce false reports. Ignoring malloc/free in dlopen/dlclose is not enough
2092   // because some libc functions call __libc_dlopen.
2093   if (info && IsAppNotRodata((uptr)info->dlpi_name))
2094     MemoryResetRange(cbdata->thr, cbdata->pc, (uptr)info->dlpi_name,
2095                      internal_strlen(info->dlpi_name));
2096   int res = cbdata->cb(info, size, cbdata->data);
2097   // Perform the check one more time in case info->dlpi_name was overwritten
2098   // by user callback.
2099   if (info && IsAppNotRodata((uptr)info->dlpi_name))
2100     MemoryResetRange(cbdata->thr, cbdata->pc, (uptr)info->dlpi_name,
2101                      internal_strlen(info->dlpi_name));
2102   return res;
2103 }
2104 
TSAN_INTERCEPTOR(int,dl_iterate_phdr,dl_iterate_phdr_cb_t cb,void * data)2105 TSAN_INTERCEPTOR(int, dl_iterate_phdr, dl_iterate_phdr_cb_t cb, void *data) {
2106   SCOPED_TSAN_INTERCEPTOR(dl_iterate_phdr, cb, data);
2107   dl_iterate_phdr_data cbdata;
2108   cbdata.thr = thr;
2109   cbdata.pc = pc;
2110   cbdata.cb = cb;
2111   cbdata.data = data;
2112   int res = REAL(dl_iterate_phdr)(dl_iterate_phdr_cb, &cbdata);
2113   return res;
2114 }
2115 #endif
2116 
OnExit(ThreadState * thr)2117 static int OnExit(ThreadState *thr) {
2118   int status = Finalize(thr);
2119   FlushStreams();
2120   return status;
2121 }
2122 
2123 struct TsanInterceptorContext {
2124   ThreadState *thr;
2125   const uptr caller_pc;
2126   const uptr pc;
2127 };
2128 
2129 #if !SANITIZER_MAC
HandleRecvmsg(ThreadState * thr,uptr pc,__sanitizer_msghdr * msg)2130 static void HandleRecvmsg(ThreadState *thr, uptr pc,
2131     __sanitizer_msghdr *msg) {
2132   int fds[64];
2133   int cnt = ExtractRecvmsgFDs(msg, fds, ARRAY_SIZE(fds));
2134   for (int i = 0; i < cnt; i++)
2135     FdEventCreate(thr, pc, fds[i]);
2136 }
2137 #endif
2138 
2139 #include "sanitizer_common/sanitizer_platform_interceptors.h"
2140 // Causes interceptor recursion (getaddrinfo() and fopen())
2141 #undef SANITIZER_INTERCEPT_GETADDRINFO
2142 // There interceptors do not seem to be strictly necessary for tsan.
2143 // But we see cases where the interceptors consume 70% of execution time.
2144 // Memory blocks passed to fgetgrent_r are "written to" by tsan several times.
2145 // First, there is some recursion (getgrnam_r calls fgetgrent_r), and each
2146 // function "writes to" the buffer. Then, the same memory is "written to"
2147 // twice, first as buf and then as pwbufp (both of them refer to the same
2148 // addresses).
2149 #undef SANITIZER_INTERCEPT_GETPWENT
2150 #undef SANITIZER_INTERCEPT_GETPWENT_R
2151 #undef SANITIZER_INTERCEPT_FGETPWENT
2152 #undef SANITIZER_INTERCEPT_GETPWNAM_AND_FRIENDS
2153 #undef SANITIZER_INTERCEPT_GETPWNAM_R_AND_FRIENDS
2154 // We define our own.
2155 #if SANITIZER_INTERCEPT_TLS_GET_ADDR
2156 #define NEED_TLS_GET_ADDR
2157 #endif
2158 #undef SANITIZER_INTERCEPT_TLS_GET_ADDR
2159 
2160 #define COMMON_INTERCEPT_FUNCTION(name) INTERCEPT_FUNCTION(name)
2161 #define COMMON_INTERCEPT_FUNCTION_VER(name, ver)                          \
2162   INTERCEPT_FUNCTION_VER(name, ver)
2163 
2164 #define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size)                    \
2165   MemoryAccessRange(((TsanInterceptorContext *)ctx)->thr,                 \
2166                     ((TsanInterceptorContext *)ctx)->pc, (uptr)ptr, size, \
2167                     true)
2168 
2169 #define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size)                       \
2170   MemoryAccessRange(((TsanInterceptorContext *) ctx)->thr,                  \
2171                     ((TsanInterceptorContext *) ctx)->pc, (uptr) ptr, size, \
2172                     false)
2173 
2174 #define COMMON_INTERCEPTOR_ENTER(ctx, func, ...)      \
2175   SCOPED_TSAN_INTERCEPTOR(func, __VA_ARGS__);         \
2176   TsanInterceptorContext _ctx = {thr, caller_pc, pc}; \
2177   ctx = (void *)&_ctx;                                \
2178   (void) ctx;
2179 
2180 #define COMMON_INTERCEPTOR_ENTER_NOIGNORE(ctx, func, ...) \
2181   SCOPED_INTERCEPTOR_RAW(func, __VA_ARGS__);              \
2182   TsanInterceptorContext _ctx = {thr, caller_pc, pc};     \
2183   ctx = (void *)&_ctx;                                    \
2184   (void) ctx;
2185 
2186 #define COMMON_INTERCEPTOR_FILE_OPEN(ctx, file, path) \
2187   Acquire(thr, pc, File2addr(path));                  \
2188   if (file) {                                         \
2189     int fd = fileno_unlocked(file);                   \
2190     if (fd >= 0) FdFileCreate(thr, pc, fd);           \
2191   }
2192 
2193 #define COMMON_INTERCEPTOR_FILE_CLOSE(ctx, file) \
2194   if (file) {                                    \
2195     int fd = fileno_unlocked(file);              \
2196     if (fd >= 0) FdClose(thr, pc, fd);           \
2197   }
2198 
2199 #define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, handle) \
2200   libignore()->OnLibraryLoaded(filename)
2201 
2202 #define COMMON_INTERCEPTOR_LIBRARY_UNLOADED() \
2203   libignore()->OnLibraryUnloaded()
2204 
2205 #define COMMON_INTERCEPTOR_ACQUIRE(ctx, u) \
2206   Acquire(((TsanInterceptorContext *) ctx)->thr, pc, u)
2207 
2208 #define COMMON_INTERCEPTOR_RELEASE(ctx, u) \
2209   Release(((TsanInterceptorContext *) ctx)->thr, pc, u)
2210 
2211 #define COMMON_INTERCEPTOR_DIR_ACQUIRE(ctx, path) \
2212   Acquire(((TsanInterceptorContext *) ctx)->thr, pc, Dir2addr(path))
2213 
2214 #define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \
2215   FdAcquire(((TsanInterceptorContext *) ctx)->thr, pc, fd)
2216 
2217 #define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \
2218   FdRelease(((TsanInterceptorContext *) ctx)->thr, pc, fd)
2219 
2220 #define COMMON_INTERCEPTOR_FD_ACCESS(ctx, fd) \
2221   FdAccess(((TsanInterceptorContext *) ctx)->thr, pc, fd)
2222 
2223 #define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd) \
2224   FdSocketAccept(((TsanInterceptorContext *) ctx)->thr, pc, fd, newfd)
2225 
2226 #define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) \
2227   ThreadSetName(((TsanInterceptorContext *) ctx)->thr, name)
2228 
2229 #define COMMON_INTERCEPTOR_SET_PTHREAD_NAME(ctx, thread, name) \
2230   __tsan::ctx->thread_registry->SetThreadNameByUserId(thread, name)
2231 
2232 #define COMMON_INTERCEPTOR_BLOCK_REAL(name) BLOCK_REAL(name)
2233 
2234 #define COMMON_INTERCEPTOR_ON_EXIT(ctx) \
2235   OnExit(((TsanInterceptorContext *) ctx)->thr)
2236 
2237 #define COMMON_INTERCEPTOR_MUTEX_LOCK(ctx, m) \
2238   MutexLock(((TsanInterceptorContext *)ctx)->thr, \
2239             ((TsanInterceptorContext *)ctx)->pc, (uptr)m)
2240 
2241 #define COMMON_INTERCEPTOR_MUTEX_UNLOCK(ctx, m) \
2242   MutexUnlock(((TsanInterceptorContext *)ctx)->thr, \
2243             ((TsanInterceptorContext *)ctx)->pc, (uptr)m)
2244 
2245 #define COMMON_INTERCEPTOR_MUTEX_REPAIR(ctx, m) \
2246   MutexRepair(((TsanInterceptorContext *)ctx)->thr, \
2247             ((TsanInterceptorContext *)ctx)->pc, (uptr)m)
2248 
2249 #define COMMON_INTERCEPTOR_MUTEX_INVALID(ctx, m) \
2250   MutexInvalidAccess(((TsanInterceptorContext *)ctx)->thr, \
2251                      ((TsanInterceptorContext *)ctx)->pc, (uptr)m)
2252 
2253 #if !SANITIZER_MAC
2254 #define COMMON_INTERCEPTOR_HANDLE_RECVMSG(ctx, msg) \
2255   HandleRecvmsg(((TsanInterceptorContext *)ctx)->thr, \
2256       ((TsanInterceptorContext *)ctx)->pc, msg)
2257 #endif
2258 
2259 #define COMMON_INTERCEPTOR_GET_TLS_RANGE(begin, end)                           \
2260   if (TsanThread *t = GetCurrentThread()) {                                    \
2261     *begin = t->tls_begin();                                                   \
2262     *end = t->tls_end();                                                       \
2263   } else {                                                                     \
2264     *begin = *end = 0;                                                         \
2265   }
2266 
2267 #define COMMON_INTERCEPTOR_USER_CALLBACK_START() \
2268   SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_START()
2269 
2270 #define COMMON_INTERCEPTOR_USER_CALLBACK_END() \
2271   SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_END()
2272 
2273 #include "sanitizer_common/sanitizer_common_interceptors.inc"
2274 
2275 #define TSAN_SYSCALL() \
2276   ThreadState *thr = cur_thread(); \
2277   if (thr->ignore_interceptors) \
2278     return; \
2279   ScopedSyscall scoped_syscall(thr) \
2280 /**/
2281 
2282 struct ScopedSyscall {
2283   ThreadState *thr;
2284 
ScopedSyscallScopedSyscall2285   explicit ScopedSyscall(ThreadState *thr)
2286       : thr(thr) {
2287     Initialize(thr);
2288   }
2289 
~ScopedSyscallScopedSyscall2290   ~ScopedSyscall() {
2291     ProcessPendingSignals(thr);
2292   }
2293 };
2294 
2295 #if !SANITIZER_FREEBSD && !SANITIZER_MAC
syscall_access_range(uptr pc,uptr p,uptr s,bool write)2296 static void syscall_access_range(uptr pc, uptr p, uptr s, bool write) {
2297   TSAN_SYSCALL();
2298   MemoryAccessRange(thr, pc, p, s, write);
2299 }
2300 
syscall_acquire(uptr pc,uptr addr)2301 static void syscall_acquire(uptr pc, uptr addr) {
2302   TSAN_SYSCALL();
2303   Acquire(thr, pc, addr);
2304   DPrintf("syscall_acquire(%p)\n", addr);
2305 }
2306 
syscall_release(uptr pc,uptr addr)2307 static void syscall_release(uptr pc, uptr addr) {
2308   TSAN_SYSCALL();
2309   DPrintf("syscall_release(%p)\n", addr);
2310   Release(thr, pc, addr);
2311 }
2312 
syscall_fd_close(uptr pc,int fd)2313 static void syscall_fd_close(uptr pc, int fd) {
2314   TSAN_SYSCALL();
2315   FdClose(thr, pc, fd);
2316 }
2317 
syscall_fd_acquire(uptr pc,int fd)2318 static USED void syscall_fd_acquire(uptr pc, int fd) {
2319   TSAN_SYSCALL();
2320   FdAcquire(thr, pc, fd);
2321   DPrintf("syscall_fd_acquire(%p)\n", fd);
2322 }
2323 
syscall_fd_release(uptr pc,int fd)2324 static USED void syscall_fd_release(uptr pc, int fd) {
2325   TSAN_SYSCALL();
2326   DPrintf("syscall_fd_release(%p)\n", fd);
2327   FdRelease(thr, pc, fd);
2328 }
2329 
syscall_pre_fork(uptr pc)2330 static void syscall_pre_fork(uptr pc) {
2331   TSAN_SYSCALL();
2332   ForkBefore(thr, pc);
2333 }
2334 
syscall_post_fork(uptr pc,int pid)2335 static void syscall_post_fork(uptr pc, int pid) {
2336   TSAN_SYSCALL();
2337   if (pid == 0) {
2338     // child
2339     ForkChildAfter(thr, pc);
2340     FdOnFork(thr, pc);
2341   } else if (pid > 0) {
2342     // parent
2343     ForkParentAfter(thr, pc);
2344   } else {
2345     // error
2346     ForkParentAfter(thr, pc);
2347   }
2348 }
2349 #endif
2350 
2351 #define COMMON_SYSCALL_PRE_READ_RANGE(p, s) \
2352   syscall_access_range(GET_CALLER_PC(), (uptr)(p), (uptr)(s), false)
2353 
2354 #define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) \
2355   syscall_access_range(GET_CALLER_PC(), (uptr)(p), (uptr)(s), true)
2356 
2357 #define COMMON_SYSCALL_POST_READ_RANGE(p, s) \
2358   do {                                       \
2359     (void)(p);                               \
2360     (void)(s);                               \
2361   } while (false)
2362 
2363 #define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) \
2364   do {                                        \
2365     (void)(p);                                \
2366     (void)(s);                                \
2367   } while (false)
2368 
2369 #define COMMON_SYSCALL_ACQUIRE(addr) \
2370     syscall_acquire(GET_CALLER_PC(), (uptr)(addr))
2371 
2372 #define COMMON_SYSCALL_RELEASE(addr) \
2373     syscall_release(GET_CALLER_PC(), (uptr)(addr))
2374 
2375 #define COMMON_SYSCALL_FD_CLOSE(fd) syscall_fd_close(GET_CALLER_PC(), fd)
2376 
2377 #define COMMON_SYSCALL_FD_ACQUIRE(fd) syscall_fd_acquire(GET_CALLER_PC(), fd)
2378 
2379 #define COMMON_SYSCALL_FD_RELEASE(fd) syscall_fd_release(GET_CALLER_PC(), fd)
2380 
2381 #define COMMON_SYSCALL_PRE_FORK() \
2382   syscall_pre_fork(GET_CALLER_PC())
2383 
2384 #define COMMON_SYSCALL_POST_FORK(res) \
2385   syscall_post_fork(GET_CALLER_PC(), res)
2386 
2387 #include "sanitizer_common/sanitizer_common_syscalls.inc"
2388 
2389 #ifdef NEED_TLS_GET_ADDR
2390 // Define own interceptor instead of sanitizer_common's for three reasons:
2391 // 1. It must not process pending signals.
2392 //    Signal handlers may contain MOVDQA instruction (see below).
2393 // 2. It must be as simple as possible to not contain MOVDQA.
2394 // 3. Sanitizer_common version uses COMMON_INTERCEPTOR_INITIALIZE_RANGE which
2395 //    is empty for tsan (meant only for msan).
2396 // Note: __tls_get_addr can be called with mis-aligned stack due to:
2397 // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58066
2398 // So the interceptor must work with mis-aligned stack, in particular, does not
2399 // execute MOVDQA with stack addresses.
TSAN_INTERCEPTOR(void *,__tls_get_addr,void * arg)2400 TSAN_INTERCEPTOR(void *, __tls_get_addr, void *arg) {
2401   void *res = REAL(__tls_get_addr)(arg);
2402   ThreadState *thr = cur_thread();
2403   if (!thr)
2404     return res;
2405   DTLS::DTV *dtv = DTLS_on_tls_get_addr(arg, res, thr->tls_addr, thr->tls_size);
2406   if (!dtv)
2407     return res;
2408   // New DTLS block has been allocated.
2409   MemoryResetRange(thr, 0, dtv->beg, dtv->size);
2410   return res;
2411 }
2412 #endif
2413 
2414 namespace __tsan {
2415 
finalize(void * arg)2416 static void finalize(void *arg) {
2417   ThreadState *thr = cur_thread();
2418   int status = Finalize(thr);
2419   // Make sure the output is not lost.
2420   FlushStreams();
2421   if (status)
2422     Die();
2423 }
2424 
2425 #if !SANITIZER_MAC && !SANITIZER_ANDROID
unreachable()2426 static void unreachable() {
2427   Report("FATAL: ThreadSanitizer: unreachable called\n");
2428   Die();
2429 }
2430 #endif
2431 
InitializeInterceptors()2432 void InitializeInterceptors() {
2433 #if !SANITIZER_MAC
2434   // We need to setup it early, because functions like dlsym() can call it.
2435   REAL(memset) = internal_memset;
2436   REAL(memcpy) = internal_memcpy;
2437 #endif
2438 
2439   // Instruct libc malloc to consume less memory.
2440 #if SANITIZER_LINUX
2441   mallopt(1, 0);  // M_MXFAST
2442   mallopt(-3, 32*1024);  // M_MMAP_THRESHOLD
2443 #endif
2444 
2445   InitializeCommonInterceptors();
2446 
2447 #if !SANITIZER_MAC
2448   // We can not use TSAN_INTERCEPT to get setjmp addr,
2449   // because it does &setjmp and setjmp is not present in some versions of libc.
2450   using __interception::GetRealFunctionAddress;
2451   GetRealFunctionAddress("setjmp", (uptr*)&REAL(setjmp), 0, 0);
2452   GetRealFunctionAddress("_setjmp", (uptr*)&REAL(_setjmp), 0, 0);
2453   GetRealFunctionAddress("sigsetjmp", (uptr*)&REAL(sigsetjmp), 0, 0);
2454   GetRealFunctionAddress("__sigsetjmp", (uptr*)&REAL(__sigsetjmp), 0, 0);
2455 #endif
2456 
2457   TSAN_INTERCEPT(longjmp);
2458   TSAN_INTERCEPT(siglongjmp);
2459 
2460   TSAN_INTERCEPT(malloc);
2461   TSAN_INTERCEPT(__libc_memalign);
2462   TSAN_INTERCEPT(calloc);
2463   TSAN_INTERCEPT(realloc);
2464   TSAN_INTERCEPT(free);
2465   TSAN_INTERCEPT(cfree);
2466   TSAN_INTERCEPT(mmap);
2467   TSAN_MAYBE_INTERCEPT_MMAP64;
2468   TSAN_INTERCEPT(munmap);
2469   TSAN_MAYBE_INTERCEPT_MEMALIGN;
2470   TSAN_INTERCEPT(valloc);
2471   TSAN_MAYBE_INTERCEPT_PVALLOC;
2472   TSAN_INTERCEPT(posix_memalign);
2473 
2474   TSAN_INTERCEPT(strcpy);  // NOLINT
2475   TSAN_INTERCEPT(strncpy);
2476   TSAN_INTERCEPT(strdup);
2477 
2478   TSAN_INTERCEPT(pthread_create);
2479   TSAN_INTERCEPT(pthread_join);
2480   TSAN_INTERCEPT(pthread_detach);
2481 
2482   TSAN_INTERCEPT_VER(pthread_cond_init, PTHREAD_ABI_BASE);
2483   TSAN_INTERCEPT_VER(pthread_cond_signal, PTHREAD_ABI_BASE);
2484   TSAN_INTERCEPT_VER(pthread_cond_broadcast, PTHREAD_ABI_BASE);
2485   TSAN_INTERCEPT_VER(pthread_cond_wait, PTHREAD_ABI_BASE);
2486   TSAN_INTERCEPT_VER(pthread_cond_timedwait, PTHREAD_ABI_BASE);
2487   TSAN_INTERCEPT_VER(pthread_cond_destroy, PTHREAD_ABI_BASE);
2488 
2489   TSAN_INTERCEPT(pthread_mutex_init);
2490   TSAN_INTERCEPT(pthread_mutex_destroy);
2491   TSAN_INTERCEPT(pthread_mutex_trylock);
2492   TSAN_INTERCEPT(pthread_mutex_timedlock);
2493 
2494   TSAN_INTERCEPT(pthread_spin_init);
2495   TSAN_INTERCEPT(pthread_spin_destroy);
2496   TSAN_INTERCEPT(pthread_spin_lock);
2497   TSAN_INTERCEPT(pthread_spin_trylock);
2498   TSAN_INTERCEPT(pthread_spin_unlock);
2499 
2500   TSAN_INTERCEPT(pthread_rwlock_init);
2501   TSAN_INTERCEPT(pthread_rwlock_destroy);
2502   TSAN_INTERCEPT(pthread_rwlock_rdlock);
2503   TSAN_INTERCEPT(pthread_rwlock_tryrdlock);
2504   TSAN_INTERCEPT(pthread_rwlock_timedrdlock);
2505   TSAN_INTERCEPT(pthread_rwlock_wrlock);
2506   TSAN_INTERCEPT(pthread_rwlock_trywrlock);
2507   TSAN_INTERCEPT(pthread_rwlock_timedwrlock);
2508   TSAN_INTERCEPT(pthread_rwlock_unlock);
2509 
2510   TSAN_INTERCEPT(pthread_barrier_init);
2511   TSAN_INTERCEPT(pthread_barrier_destroy);
2512   TSAN_INTERCEPT(pthread_barrier_wait);
2513 
2514   TSAN_INTERCEPT(pthread_once);
2515 
2516   TSAN_INTERCEPT(fstat);
2517   TSAN_MAYBE_INTERCEPT___FXSTAT;
2518   TSAN_MAYBE_INTERCEPT_FSTAT64;
2519   TSAN_MAYBE_INTERCEPT___FXSTAT64;
2520   TSAN_INTERCEPT(open);
2521   TSAN_MAYBE_INTERCEPT_OPEN64;
2522   TSAN_INTERCEPT(creat);
2523   TSAN_MAYBE_INTERCEPT_CREAT64;
2524   TSAN_INTERCEPT(dup);
2525   TSAN_INTERCEPT(dup2);
2526   TSAN_INTERCEPT(dup3);
2527   TSAN_MAYBE_INTERCEPT_EVENTFD;
2528   TSAN_MAYBE_INTERCEPT_SIGNALFD;
2529   TSAN_MAYBE_INTERCEPT_INOTIFY_INIT;
2530   TSAN_MAYBE_INTERCEPT_INOTIFY_INIT1;
2531   TSAN_INTERCEPT(socket);
2532   TSAN_INTERCEPT(socketpair);
2533   TSAN_INTERCEPT(connect);
2534   TSAN_INTERCEPT(bind);
2535   TSAN_INTERCEPT(listen);
2536   TSAN_MAYBE_INTERCEPT_EPOLL;
2537   TSAN_INTERCEPT(close);
2538   TSAN_MAYBE_INTERCEPT___CLOSE;
2539   TSAN_MAYBE_INTERCEPT___RES_ICLOSE;
2540   TSAN_INTERCEPT(pipe);
2541   TSAN_INTERCEPT(pipe2);
2542 
2543   TSAN_INTERCEPT(unlink);
2544   TSAN_INTERCEPT(tmpfile);
2545   TSAN_MAYBE_INTERCEPT_TMPFILE64;
2546   TSAN_INTERCEPT(fread);
2547   TSAN_INTERCEPT(fwrite);
2548   TSAN_INTERCEPT(abort);
2549   TSAN_INTERCEPT(puts);
2550   TSAN_INTERCEPT(rmdir);
2551   TSAN_INTERCEPT(closedir);
2552 
2553   TSAN_INTERCEPT(sigaction);
2554   TSAN_INTERCEPT(signal);
2555   TSAN_INTERCEPT(sigsuspend);
2556   TSAN_INTERCEPT(raise);
2557   TSAN_INTERCEPT(kill);
2558   TSAN_INTERCEPT(pthread_kill);
2559   TSAN_INTERCEPT(sleep);
2560   TSAN_INTERCEPT(usleep);
2561   TSAN_INTERCEPT(nanosleep);
2562   TSAN_INTERCEPT(gettimeofday);
2563   TSAN_INTERCEPT(getaddrinfo);
2564 
2565   TSAN_INTERCEPT(fork);
2566   TSAN_INTERCEPT(vfork);
2567 #if !SANITIZER_ANDROID
2568   TSAN_INTERCEPT(dl_iterate_phdr);
2569 #endif
2570   TSAN_INTERCEPT(on_exit);
2571   TSAN_INTERCEPT(__cxa_atexit);
2572   TSAN_INTERCEPT(_exit);
2573 
2574 #ifdef NEED_TLS_GET_ADDR
2575   TSAN_INTERCEPT(__tls_get_addr);
2576 #endif
2577 
2578 #if !SANITIZER_MAC && !SANITIZER_ANDROID
2579   // Need to setup it, because interceptors check that the function is resolved.
2580   // But atexit is emitted directly into the module, so can't be resolved.
2581   REAL(atexit) = (int(*)(void(*)()))unreachable;
2582 #endif
2583 
2584   if (REAL(__cxa_atexit)(&finalize, 0, 0)) {
2585     Printf("ThreadSanitizer: failed to setup atexit callback\n");
2586     Die();
2587   }
2588 
2589 #if !SANITIZER_MAC
2590   if (pthread_key_create(&g_thread_finalize_key, &thread_finalize)) {
2591     Printf("ThreadSanitizer: failed to create thread key\n");
2592     Die();
2593   }
2594 #endif
2595 
2596   FdInit();
2597 }
2598 
2599 }  // namespace __tsan
2600 
2601 // Invisible barrier for tests.
2602 // There were several unsuccessful iterations for this functionality:
2603 // 1. Initially it was implemented in user code using
2604 //    REAL(pthread_barrier_wait). But pthread_barrier_wait is not supported on
2605 //    MacOS. Futexes are linux-specific for this matter.
2606 // 2. Then we switched to atomics+usleep(10). But usleep produced parasitic
2607 //    "as-if synchronized via sleep" messages in reports which failed some
2608 //    output tests.
2609 // 3. Then we switched to atomics+sched_yield. But this produced tons of tsan-
2610 //    visible events, which lead to "failed to restore stack trace" failures.
2611 // Note that no_sanitize_thread attribute does not turn off atomic interception
2612 // so attaching it to the function defined in user code does not help.
2613 // That's why we now have what we have.
2614 extern "C" SANITIZER_INTERFACE_ATTRIBUTE
__tsan_testonly_barrier_init(u64 * barrier,u32 count)2615 void __tsan_testonly_barrier_init(u64 *barrier, u32 count) {
2616   if (count >= (1 << 8)) {
2617       Printf("barrier_init: count is too large (%d)\n", count);
2618       Die();
2619   }
2620   // 8 lsb is thread count, the remaining are count of entered threads.
2621   *barrier = count;
2622 }
2623 
2624 extern "C" SANITIZER_INTERFACE_ATTRIBUTE
__tsan_testonly_barrier_wait(u64 * barrier)2625 void __tsan_testonly_barrier_wait(u64 *barrier) {
2626   unsigned old = __atomic_fetch_add(barrier, 1 << 8, __ATOMIC_RELAXED);
2627   unsigned old_epoch = (old >> 8) / (old & 0xff);
2628   for (;;) {
2629     unsigned cur = __atomic_load_n(barrier, __ATOMIC_RELAXED);
2630     unsigned cur_epoch = (cur >> 8) / (cur & 0xff);
2631     if (cur_epoch != old_epoch)
2632       return;
2633     internal_sched_yield();
2634   }
2635 }
2636