1 //===-- tsan_interceptors_posix.cpp ---------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file is a part of ThreadSanitizer (TSan), a race detector.
10 //
11 // FIXME: move as many interceptors as possible into
12 // sanitizer_common/sanitizer_common_interceptors.inc
13 //===----------------------------------------------------------------------===//
14
15 #include "sanitizer_common/sanitizer_atomic.h"
16 #include "sanitizer_common/sanitizer_errno.h"
17 #include "sanitizer_common/sanitizer_libc.h"
18 #include "sanitizer_common/sanitizer_linux.h"
19 #include "sanitizer_common/sanitizer_platform_limits_netbsd.h"
20 #include "sanitizer_common/sanitizer_platform_limits_posix.h"
21 #include "sanitizer_common/sanitizer_placement_new.h"
22 #include "sanitizer_common/sanitizer_posix.h"
23 #include "sanitizer_common/sanitizer_stacktrace.h"
24 #include "sanitizer_common/sanitizer_tls_get_addr.h"
25 #include "interception/interception.h"
26 #include "tsan_interceptors.h"
27 #include "tsan_interface.h"
28 #include "tsan_platform.h"
29 #include "tsan_suppressions.h"
30 #include "tsan_rtl.h"
31 #include "tsan_mman.h"
32 #include "tsan_fd.h"
33
34 #include <stdarg.h>
35
36 using namespace __tsan;
37
38 #if SANITIZER_FREEBSD || SANITIZER_MAC
39 #define stdout __stdoutp
40 #define stderr __stderrp
41 #endif
42
43 #if SANITIZER_NETBSD
44 #define dirfd(dirp) (*(int *)(dirp))
45 #define fileno_unlocked(fp) \
46 (((__sanitizer_FILE *)fp)->_file == -1 \
47 ? -1 \
48 : (int)(unsigned short)(((__sanitizer_FILE *)fp)->_file))
49
50 #define stdout ((__sanitizer_FILE*)&__sF[1])
51 #define stderr ((__sanitizer_FILE*)&__sF[2])
52
53 #define nanosleep __nanosleep50
54 #define vfork __vfork14
55 #endif
56
57 #ifdef __mips__
58 const int kSigCount = 129;
59 #else
60 const int kSigCount = 65;
61 #endif
62
63 #ifdef __mips__
64 struct ucontext_t {
65 u64 opaque[768 / sizeof(u64) + 1];
66 };
67 #else
68 struct ucontext_t {
69 // The size is determined by looking at sizeof of real ucontext_t on linux.
70 u64 opaque[936 / sizeof(u64) + 1];
71 };
72 #endif
73
74 #if defined(__x86_64__) || defined(__mips__) || SANITIZER_PPC64V1
75 #define PTHREAD_ABI_BASE "GLIBC_2.3.2"
76 #elif defined(__aarch64__) || SANITIZER_PPC64V2
77 #define PTHREAD_ABI_BASE "GLIBC_2.17"
78 #endif
79
80 extern "C" int pthread_attr_init(void *attr);
81 extern "C" int pthread_attr_destroy(void *attr);
82 DECLARE_REAL(int, pthread_attr_getdetachstate, void *, void *)
83 extern "C" int pthread_attr_setstacksize(void *attr, uptr stacksize);
84 extern "C" int pthread_key_create(unsigned *key, void (*destructor)(void* v));
85 extern "C" int pthread_setspecific(unsigned key, const void *v);
86 DECLARE_REAL(int, pthread_mutexattr_gettype, void *, void *)
87 DECLARE_REAL(int, fflush, __sanitizer_FILE *fp)
88 DECLARE_REAL_AND_INTERCEPTOR(void *, malloc, uptr size)
89 DECLARE_REAL_AND_INTERCEPTOR(void, free, void *ptr)
90 extern "C" void *pthread_self();
91 extern "C" void _exit(int status);
92 #if !SANITIZER_NETBSD
93 extern "C" int fileno_unlocked(void *stream);
94 extern "C" int dirfd(void *dirp);
95 #endif
96 #if SANITIZER_GLIBC
97 extern "C" int mallopt(int param, int value);
98 #endif
99 #if SANITIZER_NETBSD
100 extern __sanitizer_FILE __sF[];
101 #else
102 extern __sanitizer_FILE *stdout, *stderr;
103 #endif
104 #if !SANITIZER_FREEBSD && !SANITIZER_MAC && !SANITIZER_NETBSD
105 const int PTHREAD_MUTEX_RECURSIVE = 1;
106 const int PTHREAD_MUTEX_RECURSIVE_NP = 1;
107 #else
108 const int PTHREAD_MUTEX_RECURSIVE = 2;
109 const int PTHREAD_MUTEX_RECURSIVE_NP = 2;
110 #endif
111 #if !SANITIZER_FREEBSD && !SANITIZER_MAC && !SANITIZER_NETBSD
112 const int EPOLL_CTL_ADD = 1;
113 #endif
114 const int SIGILL = 4;
115 const int SIGTRAP = 5;
116 const int SIGABRT = 6;
117 const int SIGFPE = 8;
118 const int SIGSEGV = 11;
119 const int SIGPIPE = 13;
120 const int SIGTERM = 15;
121 #if defined(__mips__) || SANITIZER_FREEBSD || SANITIZER_MAC || SANITIZER_NETBSD
122 const int SIGBUS = 10;
123 const int SIGSYS = 12;
124 #else
125 const int SIGBUS = 7;
126 const int SIGSYS = 31;
127 #endif
128 void *const MAP_FAILED = (void*)-1;
129 #if SANITIZER_NETBSD
130 const int PTHREAD_BARRIER_SERIAL_THREAD = 1234567;
131 #elif !SANITIZER_MAC
132 const int PTHREAD_BARRIER_SERIAL_THREAD = -1;
133 #endif
134 const int MAP_FIXED = 0x10;
135 typedef long long_t;
136 typedef __sanitizer::u16 mode_t;
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 #if SANITIZER_FREEBSD || SANITIZER_MAC || SANITIZER_NETBSD
145 const int SA_SIGINFO = 0x40;
146 const int SIG_SETMASK = 3;
147 #elif defined(__mips__)
148 const int SA_SIGINFO = 8;
149 const int SIG_SETMASK = 3;
150 #else
151 const int SA_SIGINFO = 4;
152 const int SIG_SETMASK = 2;
153 #endif
154
155 #define COMMON_INTERCEPTOR_NOTHING_IS_INITIALIZED \
156 (cur_thread_init(), !cur_thread()->is_inited)
157
158 namespace __tsan {
159 struct SignalDesc {
160 bool armed;
161 bool sigaction;
162 __sanitizer_siginfo siginfo;
163 ucontext_t ctx;
164 };
165
166 struct ThreadSignalContext {
167 int int_signal_send;
168 atomic_uintptr_t in_blocking_func;
169 atomic_uintptr_t have_pending_signals;
170 SignalDesc pending_signals[kSigCount];
171 // emptyset and oldset are too big for stack.
172 __sanitizer_sigset_t emptyset;
173 __sanitizer_sigset_t oldset;
174 };
175
176 // The sole reason tsan wraps atexit callbacks is to establish synchronization
177 // between callback setup and callback execution.
178 struct AtExitCtx {
179 void (*f)();
180 void *arg;
181 };
182
183 // InterceptorContext holds all global data required for interceptors.
184 // It's explicitly constructed in InitializeInterceptors with placement new
185 // and is never destroyed. This allows usage of members with non-trivial
186 // constructors and destructors.
187 struct InterceptorContext {
188 // The object is 64-byte aligned, because we want hot data to be located
189 // in a single cache line if possible (it's accessed in every interceptor).
190 ALIGNED(64) LibIgnore libignore;
191 __sanitizer_sigaction sigactions[kSigCount];
192 #if !SANITIZER_MAC && !SANITIZER_NETBSD
193 unsigned finalize_key;
194 #endif
195
196 BlockingMutex atexit_mu;
197 Vector<struct AtExitCtx *> AtExitStack;
198
InterceptorContext__tsan::InterceptorContext199 InterceptorContext()
200 : libignore(LINKER_INITIALIZED), AtExitStack() {
201 }
202 };
203
204 static ALIGNED(64) char interceptor_placeholder[sizeof(InterceptorContext)];
interceptor_ctx()205 InterceptorContext *interceptor_ctx() {
206 return reinterpret_cast<InterceptorContext*>(&interceptor_placeholder[0]);
207 }
208
libignore()209 LibIgnore *libignore() {
210 return &interceptor_ctx()->libignore;
211 }
212
InitializeLibIgnore()213 void InitializeLibIgnore() {
214 const SuppressionContext &supp = *Suppressions();
215 const uptr n = supp.SuppressionCount();
216 for (uptr i = 0; i < n; i++) {
217 const Suppression *s = supp.SuppressionAt(i);
218 if (0 == internal_strcmp(s->type, kSuppressionLib))
219 libignore()->AddIgnoredLibrary(s->templ);
220 }
221 if (flags()->ignore_noninstrumented_modules)
222 libignore()->IgnoreNoninstrumentedModules(true);
223 libignore()->OnLibraryLoaded(0);
224 }
225
226 // The following two hooks can be used by for cooperative scheduling when
227 // locking.
228 #ifdef TSAN_EXTERNAL_HOOKS
229 void OnPotentiallyBlockingRegionBegin();
230 void OnPotentiallyBlockingRegionEnd();
231 #else
OnPotentiallyBlockingRegionBegin()232 SANITIZER_WEAK_CXX_DEFAULT_IMPL void OnPotentiallyBlockingRegionBegin() {}
OnPotentiallyBlockingRegionEnd()233 SANITIZER_WEAK_CXX_DEFAULT_IMPL void OnPotentiallyBlockingRegionEnd() {}
234 #endif
235
236 } // namespace __tsan
237
SigCtx(ThreadState * thr)238 static ThreadSignalContext *SigCtx(ThreadState *thr) {
239 ThreadSignalContext *ctx = (ThreadSignalContext*)thr->signal_ctx;
240 if (ctx == 0 && !thr->is_dead) {
241 ctx = (ThreadSignalContext*)MmapOrDie(sizeof(*ctx), "ThreadSignalContext");
242 MemoryResetRange(thr, (uptr)&SigCtx, (uptr)ctx, sizeof(*ctx));
243 thr->signal_ctx = ctx;
244 }
245 return ctx;
246 }
247
ScopedInterceptor(ThreadState * thr,const char * fname,uptr pc)248 ScopedInterceptor::ScopedInterceptor(ThreadState *thr, const char *fname,
249 uptr pc)
250 : thr_(thr), pc_(pc), in_ignored_lib_(false), ignoring_(false) {
251 Initialize(thr);
252 if (!thr_->is_inited) return;
253 if (!thr_->ignore_interceptors) FuncEntry(thr, pc);
254 DPrintf("#%d: intercept %s()\n", thr_->tid, fname);
255 ignoring_ =
256 !thr_->in_ignored_lib && (flags()->ignore_interceptors_accesses ||
257 libignore()->IsIgnored(pc, &in_ignored_lib_));
258 EnableIgnores();
259 }
260
~ScopedInterceptor()261 ScopedInterceptor::~ScopedInterceptor() {
262 if (!thr_->is_inited) return;
263 DisableIgnores();
264 if (!thr_->ignore_interceptors) {
265 ProcessPendingSignals(thr_);
266 FuncExit(thr_);
267 CheckNoLocks(thr_);
268 }
269 }
270
EnableIgnores()271 void ScopedInterceptor::EnableIgnores() {
272 if (ignoring_) {
273 ThreadIgnoreBegin(thr_, pc_, /*save_stack=*/false);
274 if (flags()->ignore_noninstrumented_modules) thr_->suppress_reports++;
275 if (in_ignored_lib_) {
276 DCHECK(!thr_->in_ignored_lib);
277 thr_->in_ignored_lib = true;
278 }
279 }
280 }
281
DisableIgnores()282 void ScopedInterceptor::DisableIgnores() {
283 if (ignoring_) {
284 ThreadIgnoreEnd(thr_, pc_);
285 if (flags()->ignore_noninstrumented_modules) thr_->suppress_reports--;
286 if (in_ignored_lib_) {
287 DCHECK(thr_->in_ignored_lib);
288 thr_->in_ignored_lib = false;
289 }
290 }
291 }
292
293 #define TSAN_INTERCEPT(func) INTERCEPT_FUNCTION(func)
294 #if SANITIZER_FREEBSD
295 # define TSAN_INTERCEPT_VER(func, ver) INTERCEPT_FUNCTION(func)
296 # define TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(func)
297 # define TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS_THR(func)
298 #elif SANITIZER_NETBSD
299 # define TSAN_INTERCEPT_VER(func, ver) INTERCEPT_FUNCTION(func)
300 # define TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(func) \
301 INTERCEPT_FUNCTION(__libc_##func)
302 # define TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS_THR(func) \
303 INTERCEPT_FUNCTION(__libc_thr_##func)
304 #else
305 # define TSAN_INTERCEPT_VER(func, ver) INTERCEPT_FUNCTION_VER(func, ver)
306 # define TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(func)
307 # define TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS_THR(func)
308 #endif
309
310 #define READ_STRING_OF_LEN(thr, pc, s, len, n) \
311 MemoryAccessRange((thr), (pc), (uptr)(s), \
312 common_flags()->strict_string_checks ? (len) + 1 : (n), false)
313
314 #define READ_STRING(thr, pc, s, n) \
315 READ_STRING_OF_LEN((thr), (pc), (s), internal_strlen(s), (n))
316
317 #define BLOCK_REAL(name) (BlockingCall(thr), REAL(name))
318
319 struct BlockingCall {
BlockingCallBlockingCall320 explicit BlockingCall(ThreadState *thr)
321 : thr(thr)
322 , ctx(SigCtx(thr)) {
323 for (;;) {
324 atomic_store(&ctx->in_blocking_func, 1, memory_order_relaxed);
325 if (atomic_load(&ctx->have_pending_signals, memory_order_relaxed) == 0)
326 break;
327 atomic_store(&ctx->in_blocking_func, 0, memory_order_relaxed);
328 ProcessPendingSignals(thr);
329 }
330 // When we are in a "blocking call", we process signals asynchronously
331 // (right when they arrive). In this context we do not expect to be
332 // executing any user/runtime code. The known interceptor sequence when
333 // this is not true is: pthread_join -> munmap(stack). It's fine
334 // to ignore munmap in this case -- we handle stack shadow separately.
335 thr->ignore_interceptors++;
336 }
337
~BlockingCallBlockingCall338 ~BlockingCall() {
339 thr->ignore_interceptors--;
340 atomic_store(&ctx->in_blocking_func, 0, memory_order_relaxed);
341 }
342
343 ThreadState *thr;
344 ThreadSignalContext *ctx;
345 };
346
TSAN_INTERCEPTOR(unsigned,sleep,unsigned sec)347 TSAN_INTERCEPTOR(unsigned, sleep, unsigned sec) {
348 SCOPED_TSAN_INTERCEPTOR(sleep, sec);
349 unsigned res = BLOCK_REAL(sleep)(sec);
350 AfterSleep(thr, pc);
351 return res;
352 }
353
TSAN_INTERCEPTOR(int,usleep,long_t usec)354 TSAN_INTERCEPTOR(int, usleep, long_t usec) {
355 SCOPED_TSAN_INTERCEPTOR(usleep, usec);
356 int res = BLOCK_REAL(usleep)(usec);
357 AfterSleep(thr, pc);
358 return res;
359 }
360
TSAN_INTERCEPTOR(int,nanosleep,void * req,void * rem)361 TSAN_INTERCEPTOR(int, nanosleep, void *req, void *rem) {
362 SCOPED_TSAN_INTERCEPTOR(nanosleep, req, rem);
363 int res = BLOCK_REAL(nanosleep)(req, rem);
364 AfterSleep(thr, pc);
365 return res;
366 }
367
TSAN_INTERCEPTOR(int,pause,int fake)368 TSAN_INTERCEPTOR(int, pause, int fake) {
369 SCOPED_TSAN_INTERCEPTOR(pause, fake);
370 return BLOCK_REAL(pause)(fake);
371 }
372
at_exit_wrapper()373 static void at_exit_wrapper() {
374 AtExitCtx *ctx;
375 {
376 // Ensure thread-safety.
377 BlockingMutexLock l(&interceptor_ctx()->atexit_mu);
378
379 // Pop AtExitCtx from the top of the stack of callback functions
380 uptr element = interceptor_ctx()->AtExitStack.Size() - 1;
381 ctx = interceptor_ctx()->AtExitStack[element];
382 interceptor_ctx()->AtExitStack.PopBack();
383 }
384
385 Acquire(cur_thread(), (uptr)0, (uptr)ctx);
386 ((void(*)())ctx->f)();
387 InternalFree(ctx);
388 }
389
cxa_at_exit_wrapper(void * arg)390 static void cxa_at_exit_wrapper(void *arg) {
391 Acquire(cur_thread(), 0, (uptr)arg);
392 AtExitCtx *ctx = (AtExitCtx*)arg;
393 ((void(*)(void *arg))ctx->f)(ctx->arg);
394 InternalFree(ctx);
395 }
396
397 static int setup_at_exit_wrapper(ThreadState *thr, uptr pc, void(*f)(),
398 void *arg, void *dso);
399
400 #if !SANITIZER_ANDROID
TSAN_INTERCEPTOR(int,atexit,void (* f)())401 TSAN_INTERCEPTOR(int, atexit, void (*f)()) {
402 if (in_symbolizer())
403 return 0;
404 // We want to setup the atexit callback even if we are in ignored lib
405 // or after fork.
406 SCOPED_INTERCEPTOR_RAW(atexit, f);
407 return setup_at_exit_wrapper(thr, pc, (void(*)())f, 0, 0);
408 }
409 #endif
410
TSAN_INTERCEPTOR(int,__cxa_atexit,void (* f)(void * a),void * arg,void * dso)411 TSAN_INTERCEPTOR(int, __cxa_atexit, void (*f)(void *a), void *arg, void *dso) {
412 if (in_symbolizer())
413 return 0;
414 SCOPED_TSAN_INTERCEPTOR(__cxa_atexit, f, arg, dso);
415 return setup_at_exit_wrapper(thr, pc, (void(*)())f, arg, dso);
416 }
417
setup_at_exit_wrapper(ThreadState * thr,uptr pc,void (* f)(),void * arg,void * dso)418 static int setup_at_exit_wrapper(ThreadState *thr, uptr pc, void(*f)(),
419 void *arg, void *dso) {
420 AtExitCtx *ctx = (AtExitCtx*)InternalAlloc(sizeof(AtExitCtx));
421 ctx->f = f;
422 ctx->arg = arg;
423 Release(thr, pc, (uptr)ctx);
424 // Memory allocation in __cxa_atexit will race with free during exit,
425 // because we do not see synchronization around atexit callback list.
426 ThreadIgnoreBegin(thr, pc);
427 int res;
428 if (!dso) {
429 // NetBSD does not preserve the 2nd argument if dso is equal to 0
430 // Store ctx in a local stack-like structure
431
432 // Ensure thread-safety.
433 BlockingMutexLock l(&interceptor_ctx()->atexit_mu);
434
435 res = REAL(__cxa_atexit)((void (*)(void *a))at_exit_wrapper, 0, 0);
436 // Push AtExitCtx on the top of the stack of callback functions
437 if (!res) {
438 interceptor_ctx()->AtExitStack.PushBack(ctx);
439 }
440 } else {
441 res = REAL(__cxa_atexit)(cxa_at_exit_wrapper, ctx, dso);
442 }
443 ThreadIgnoreEnd(thr, pc);
444 return res;
445 }
446
447 #if !SANITIZER_MAC && !SANITIZER_NETBSD
on_exit_wrapper(int status,void * arg)448 static void on_exit_wrapper(int status, void *arg) {
449 ThreadState *thr = cur_thread();
450 uptr pc = 0;
451 Acquire(thr, pc, (uptr)arg);
452 AtExitCtx *ctx = (AtExitCtx*)arg;
453 ((void(*)(int status, void *arg))ctx->f)(status, ctx->arg);
454 InternalFree(ctx);
455 }
456
TSAN_INTERCEPTOR(int,on_exit,void (* f)(int,void *),void * arg)457 TSAN_INTERCEPTOR(int, on_exit, void(*f)(int, void*), void *arg) {
458 if (in_symbolizer())
459 return 0;
460 SCOPED_TSAN_INTERCEPTOR(on_exit, f, arg);
461 AtExitCtx *ctx = (AtExitCtx*)InternalAlloc(sizeof(AtExitCtx));
462 ctx->f = (void(*)())f;
463 ctx->arg = arg;
464 Release(thr, pc, (uptr)ctx);
465 // Memory allocation in __cxa_atexit will race with free during exit,
466 // because we do not see synchronization around atexit callback list.
467 ThreadIgnoreBegin(thr, pc);
468 int res = REAL(on_exit)(on_exit_wrapper, ctx);
469 ThreadIgnoreEnd(thr, pc);
470 return res;
471 }
472 #define TSAN_MAYBE_INTERCEPT_ON_EXIT TSAN_INTERCEPT(on_exit)
473 #else
474 #define TSAN_MAYBE_INTERCEPT_ON_EXIT
475 #endif
476
477 // Cleanup old bufs.
JmpBufGarbageCollect(ThreadState * thr,uptr sp)478 static void JmpBufGarbageCollect(ThreadState *thr, uptr sp) {
479 for (uptr i = 0; i < thr->jmp_bufs.Size(); i++) {
480 JmpBuf *buf = &thr->jmp_bufs[i];
481 if (buf->sp <= sp) {
482 uptr sz = thr->jmp_bufs.Size();
483 internal_memcpy(buf, &thr->jmp_bufs[sz - 1], sizeof(*buf));
484 thr->jmp_bufs.PopBack();
485 i--;
486 }
487 }
488 }
489
SetJmp(ThreadState * thr,uptr sp)490 static void SetJmp(ThreadState *thr, uptr sp) {
491 if (!thr->is_inited) // called from libc guts during bootstrap
492 return;
493 // Cleanup old bufs.
494 JmpBufGarbageCollect(thr, sp);
495 // Remember the buf.
496 JmpBuf *buf = thr->jmp_bufs.PushBack();
497 buf->sp = sp;
498 buf->shadow_stack_pos = thr->shadow_stack_pos;
499 ThreadSignalContext *sctx = SigCtx(thr);
500 buf->int_signal_send = sctx ? sctx->int_signal_send : 0;
501 buf->in_blocking_func = sctx ?
502 atomic_load(&sctx->in_blocking_func, memory_order_relaxed) :
503 false;
504 buf->in_signal_handler = atomic_load(&thr->in_signal_handler,
505 memory_order_relaxed);
506 }
507
LongJmp(ThreadState * thr,uptr * env)508 static void LongJmp(ThreadState *thr, uptr *env) {
509 uptr sp = ExtractLongJmpSp(env);
510 // Find the saved buf with matching sp.
511 for (uptr i = 0; i < thr->jmp_bufs.Size(); i++) {
512 JmpBuf *buf = &thr->jmp_bufs[i];
513 if (buf->sp == sp) {
514 CHECK_GE(thr->shadow_stack_pos, buf->shadow_stack_pos);
515 // Unwind the stack.
516 while (thr->shadow_stack_pos > buf->shadow_stack_pos)
517 FuncExit(thr);
518 ThreadSignalContext *sctx = SigCtx(thr);
519 if (sctx) {
520 sctx->int_signal_send = buf->int_signal_send;
521 atomic_store(&sctx->in_blocking_func, buf->in_blocking_func,
522 memory_order_relaxed);
523 }
524 atomic_store(&thr->in_signal_handler, buf->in_signal_handler,
525 memory_order_relaxed);
526 JmpBufGarbageCollect(thr, buf->sp - 1); // do not collect buf->sp
527 return;
528 }
529 }
530 Printf("ThreadSanitizer: can't find longjmp buf\n");
531 CHECK(0);
532 }
533
534 // FIXME: put everything below into a common extern "C" block?
__tsan_setjmp(uptr sp)535 extern "C" void __tsan_setjmp(uptr sp) {
536 cur_thread_init();
537 SetJmp(cur_thread(), sp);
538 }
539
540 #if SANITIZER_MAC
541 TSAN_INTERCEPTOR(int, setjmp, void *env);
542 TSAN_INTERCEPTOR(int, _setjmp, void *env);
543 TSAN_INTERCEPTOR(int, sigsetjmp, void *env);
544 #else // SANITIZER_MAC
545
546 #if SANITIZER_NETBSD
547 #define setjmp_symname __setjmp14
548 #define sigsetjmp_symname __sigsetjmp14
549 #else
550 #define setjmp_symname setjmp
551 #define sigsetjmp_symname sigsetjmp
552 #endif
553
554 #define TSAN_INTERCEPTOR_SETJMP_(x) __interceptor_ ## x
555 #define TSAN_INTERCEPTOR_SETJMP__(x) TSAN_INTERCEPTOR_SETJMP_(x)
556 #define TSAN_INTERCEPTOR_SETJMP TSAN_INTERCEPTOR_SETJMP__(setjmp_symname)
557 #define TSAN_INTERCEPTOR_SIGSETJMP TSAN_INTERCEPTOR_SETJMP__(sigsetjmp_symname)
558
559 #define TSAN_STRING_SETJMP SANITIZER_STRINGIFY(setjmp_symname)
560 #define TSAN_STRING_SIGSETJMP SANITIZER_STRINGIFY(sigsetjmp_symname)
561
562 // Not called. Merely to satisfy TSAN_INTERCEPT().
563 extern "C" SANITIZER_INTERFACE_ATTRIBUTE
564 int TSAN_INTERCEPTOR_SETJMP(void *env);
TSAN_INTERCEPTOR_SETJMP(void * env)565 extern "C" int TSAN_INTERCEPTOR_SETJMP(void *env) {
566 CHECK(0);
567 return 0;
568 }
569
570 // FIXME: any reason to have a separate declaration?
571 extern "C" SANITIZER_INTERFACE_ATTRIBUTE
572 int __interceptor__setjmp(void *env);
__interceptor__setjmp(void * env)573 extern "C" int __interceptor__setjmp(void *env) {
574 CHECK(0);
575 return 0;
576 }
577
578 extern "C" SANITIZER_INTERFACE_ATTRIBUTE
579 int TSAN_INTERCEPTOR_SIGSETJMP(void *env);
TSAN_INTERCEPTOR_SIGSETJMP(void * env)580 extern "C" int TSAN_INTERCEPTOR_SIGSETJMP(void *env) {
581 CHECK(0);
582 return 0;
583 }
584
585 #if !SANITIZER_NETBSD
586 extern "C" SANITIZER_INTERFACE_ATTRIBUTE
587 int __interceptor___sigsetjmp(void *env);
__interceptor___sigsetjmp(void * env)588 extern "C" int __interceptor___sigsetjmp(void *env) {
589 CHECK(0);
590 return 0;
591 }
592 #endif
593
594 extern "C" int setjmp_symname(void *env);
595 extern "C" int _setjmp(void *env);
596 extern "C" int sigsetjmp_symname(void *env);
597 #if !SANITIZER_NETBSD
598 extern "C" int __sigsetjmp(void *env);
599 #endif
DEFINE_REAL(int,setjmp_symname,void * env)600 DEFINE_REAL(int, setjmp_symname, void *env)
601 DEFINE_REAL(int, _setjmp, void *env)
602 DEFINE_REAL(int, sigsetjmp_symname, void *env)
603 #if !SANITIZER_NETBSD
604 DEFINE_REAL(int, __sigsetjmp, void *env)
605 #endif
606 #endif // SANITIZER_MAC
607
608 #if SANITIZER_NETBSD
609 #define longjmp_symname __longjmp14
610 #define siglongjmp_symname __siglongjmp14
611 #else
612 #define longjmp_symname longjmp
613 #define siglongjmp_symname siglongjmp
614 #endif
615
616 TSAN_INTERCEPTOR(void, longjmp_symname, uptr *env, int val) {
617 // Note: if we call REAL(longjmp) in the context of ScopedInterceptor,
618 // bad things will happen. We will jump over ScopedInterceptor dtor and can
619 // leave thr->in_ignored_lib set.
620 {
621 SCOPED_INTERCEPTOR_RAW(longjmp_symname, env, val);
622 }
623 LongJmp(cur_thread(), env);
624 REAL(longjmp_symname)(env, val);
625 }
626
TSAN_INTERCEPTOR(void,siglongjmp_symname,uptr * env,int val)627 TSAN_INTERCEPTOR(void, siglongjmp_symname, uptr *env, int val) {
628 {
629 SCOPED_INTERCEPTOR_RAW(siglongjmp_symname, env, val);
630 }
631 LongJmp(cur_thread(), env);
632 REAL(siglongjmp_symname)(env, val);
633 }
634
635 #if SANITIZER_NETBSD
TSAN_INTERCEPTOR(void,_longjmp,uptr * env,int val)636 TSAN_INTERCEPTOR(void, _longjmp, uptr *env, int val) {
637 {
638 SCOPED_INTERCEPTOR_RAW(_longjmp, env, val);
639 }
640 LongJmp(cur_thread(), env);
641 REAL(_longjmp)(env, val);
642 }
643 #endif
644
645 #if !SANITIZER_MAC
TSAN_INTERCEPTOR(void *,malloc,uptr size)646 TSAN_INTERCEPTOR(void*, malloc, uptr size) {
647 if (in_symbolizer())
648 return InternalAlloc(size);
649 void *p = 0;
650 {
651 SCOPED_INTERCEPTOR_RAW(malloc, size);
652 p = user_alloc(thr, pc, size);
653 }
654 invoke_malloc_hook(p, size);
655 return p;
656 }
657
TSAN_INTERCEPTOR(void *,__libc_memalign,uptr align,uptr sz)658 TSAN_INTERCEPTOR(void*, __libc_memalign, uptr align, uptr sz) {
659 SCOPED_TSAN_INTERCEPTOR(__libc_memalign, align, sz);
660 return user_memalign(thr, pc, align, sz);
661 }
662
TSAN_INTERCEPTOR(void *,calloc,uptr size,uptr n)663 TSAN_INTERCEPTOR(void*, calloc, uptr size, uptr n) {
664 if (in_symbolizer())
665 return InternalCalloc(size, n);
666 void *p = 0;
667 {
668 SCOPED_INTERCEPTOR_RAW(calloc, size, n);
669 p = user_calloc(thr, pc, size, n);
670 }
671 invoke_malloc_hook(p, n * size);
672 return p;
673 }
674
TSAN_INTERCEPTOR(void *,realloc,void * p,uptr size)675 TSAN_INTERCEPTOR(void*, realloc, void *p, uptr size) {
676 if (in_symbolizer())
677 return InternalRealloc(p, size);
678 if (p)
679 invoke_free_hook(p);
680 {
681 SCOPED_INTERCEPTOR_RAW(realloc, p, size);
682 p = user_realloc(thr, pc, p, size);
683 }
684 invoke_malloc_hook(p, size);
685 return p;
686 }
687
TSAN_INTERCEPTOR(void *,reallocarray,void * p,uptr size,uptr n)688 TSAN_INTERCEPTOR(void*, reallocarray, void *p, uptr size, uptr n) {
689 if (in_symbolizer())
690 return InternalReallocArray(p, size, n);
691 if (p)
692 invoke_free_hook(p);
693 {
694 SCOPED_INTERCEPTOR_RAW(reallocarray, p, size, n);
695 p = user_reallocarray(thr, pc, p, size, n);
696 }
697 invoke_malloc_hook(p, size);
698 return p;
699 }
700
TSAN_INTERCEPTOR(void,free,void * p)701 TSAN_INTERCEPTOR(void, free, void *p) {
702 if (p == 0)
703 return;
704 if (in_symbolizer())
705 return InternalFree(p);
706 invoke_free_hook(p);
707 SCOPED_INTERCEPTOR_RAW(free, p);
708 user_free(thr, pc, p);
709 }
710
TSAN_INTERCEPTOR(void,cfree,void * p)711 TSAN_INTERCEPTOR(void, cfree, void *p) {
712 if (p == 0)
713 return;
714 if (in_symbolizer())
715 return InternalFree(p);
716 invoke_free_hook(p);
717 SCOPED_INTERCEPTOR_RAW(cfree, p);
718 user_free(thr, pc, p);
719 }
720
TSAN_INTERCEPTOR(uptr,malloc_usable_size,void * p)721 TSAN_INTERCEPTOR(uptr, malloc_usable_size, void *p) {
722 SCOPED_INTERCEPTOR_RAW(malloc_usable_size, p);
723 return user_alloc_usable_size(p);
724 }
725 #endif
726
TSAN_INTERCEPTOR(char *,strcpy,char * dst,const char * src)727 TSAN_INTERCEPTOR(char *, strcpy, char *dst, const char *src) {
728 SCOPED_TSAN_INTERCEPTOR(strcpy, dst, src);
729 uptr srclen = internal_strlen(src);
730 MemoryAccessRange(thr, pc, (uptr)dst, srclen + 1, true);
731 MemoryAccessRange(thr, pc, (uptr)src, srclen + 1, false);
732 return REAL(strcpy)(dst, src);
733 }
734
TSAN_INTERCEPTOR(char *,strncpy,char * dst,char * src,uptr n)735 TSAN_INTERCEPTOR(char*, strncpy, char *dst, char *src, uptr n) {
736 SCOPED_TSAN_INTERCEPTOR(strncpy, dst, src, n);
737 uptr srclen = internal_strnlen(src, n);
738 MemoryAccessRange(thr, pc, (uptr)dst, n, true);
739 MemoryAccessRange(thr, pc, (uptr)src, min(srclen + 1, n), false);
740 return REAL(strncpy)(dst, src, n);
741 }
742
TSAN_INTERCEPTOR(char *,strdup,const char * str)743 TSAN_INTERCEPTOR(char*, strdup, const char *str) {
744 SCOPED_TSAN_INTERCEPTOR(strdup, str);
745 // strdup will call malloc, so no instrumentation is required here.
746 return REAL(strdup)(str);
747 }
748
749 // Zero out addr if it points into shadow memory and was provided as a hint
750 // only, i.e., MAP_FIXED is not set.
fix_mmap_addr(void ** addr,long_t sz,int flags)751 static bool fix_mmap_addr(void **addr, long_t sz, int flags) {
752 if (*addr) {
753 if (!IsAppMem((uptr)*addr) || !IsAppMem((uptr)*addr + sz - 1)) {
754 if (flags & MAP_FIXED) {
755 errno = errno_EINVAL;
756 return false;
757 } else {
758 *addr = 0;
759 }
760 }
761 }
762 return true;
763 }
764
765 template <class Mmap>
mmap_interceptor(ThreadState * thr,uptr pc,Mmap real_mmap,void * addr,SIZE_T sz,int prot,int flags,int fd,OFF64_T off)766 static void *mmap_interceptor(ThreadState *thr, uptr pc, Mmap real_mmap,
767 void *addr, SIZE_T sz, int prot, int flags,
768 int fd, OFF64_T off) {
769 if (!fix_mmap_addr(&addr, sz, flags)) return MAP_FAILED;
770 void *res = real_mmap(addr, sz, prot, flags, fd, off);
771 if (res != MAP_FAILED) {
772 if (fd > 0) FdAccess(thr, pc, fd);
773 MemoryRangeImitateWriteOrResetRange(thr, pc, (uptr)res, sz);
774 }
775 return res;
776 }
777
TSAN_INTERCEPTOR(int,munmap,void * addr,long_t sz)778 TSAN_INTERCEPTOR(int, munmap, void *addr, long_t sz) {
779 SCOPED_TSAN_INTERCEPTOR(munmap, addr, sz);
780 UnmapShadow(thr, (uptr)addr, sz);
781 int res = REAL(munmap)(addr, sz);
782 return res;
783 }
784
785 #if SANITIZER_LINUX
TSAN_INTERCEPTOR(void *,memalign,uptr align,uptr sz)786 TSAN_INTERCEPTOR(void*, memalign, uptr align, uptr sz) {
787 SCOPED_INTERCEPTOR_RAW(memalign, align, sz);
788 return user_memalign(thr, pc, align, sz);
789 }
790 #define TSAN_MAYBE_INTERCEPT_MEMALIGN TSAN_INTERCEPT(memalign)
791 #else
792 #define TSAN_MAYBE_INTERCEPT_MEMALIGN
793 #endif
794
795 #if !SANITIZER_MAC
TSAN_INTERCEPTOR(void *,aligned_alloc,uptr align,uptr sz)796 TSAN_INTERCEPTOR(void*, aligned_alloc, uptr align, uptr sz) {
797 if (in_symbolizer())
798 return InternalAlloc(sz, nullptr, align);
799 SCOPED_INTERCEPTOR_RAW(aligned_alloc, align, sz);
800 return user_aligned_alloc(thr, pc, align, sz);
801 }
802
TSAN_INTERCEPTOR(void *,valloc,uptr sz)803 TSAN_INTERCEPTOR(void*, valloc, uptr sz) {
804 if (in_symbolizer())
805 return InternalAlloc(sz, nullptr, GetPageSizeCached());
806 SCOPED_INTERCEPTOR_RAW(valloc, sz);
807 return user_valloc(thr, pc, sz);
808 }
809 #endif
810
811 #if SANITIZER_LINUX
TSAN_INTERCEPTOR(void *,pvalloc,uptr sz)812 TSAN_INTERCEPTOR(void*, pvalloc, uptr sz) {
813 if (in_symbolizer()) {
814 uptr PageSize = GetPageSizeCached();
815 sz = sz ? RoundUpTo(sz, PageSize) : PageSize;
816 return InternalAlloc(sz, nullptr, PageSize);
817 }
818 SCOPED_INTERCEPTOR_RAW(pvalloc, sz);
819 return user_pvalloc(thr, pc, sz);
820 }
821 #define TSAN_MAYBE_INTERCEPT_PVALLOC TSAN_INTERCEPT(pvalloc)
822 #else
823 #define TSAN_MAYBE_INTERCEPT_PVALLOC
824 #endif
825
826 #if !SANITIZER_MAC
TSAN_INTERCEPTOR(int,posix_memalign,void ** memptr,uptr align,uptr sz)827 TSAN_INTERCEPTOR(int, posix_memalign, void **memptr, uptr align, uptr sz) {
828 if (in_symbolizer()) {
829 void *p = InternalAlloc(sz, nullptr, align);
830 if (!p)
831 return errno_ENOMEM;
832 *memptr = p;
833 return 0;
834 }
835 SCOPED_INTERCEPTOR_RAW(posix_memalign, memptr, align, sz);
836 return user_posix_memalign(thr, pc, memptr, align, sz);
837 }
838 #endif
839
840 // __cxa_guard_acquire and friends need to be intercepted in a special way -
841 // regular interceptors will break statically-linked libstdc++. Linux
842 // interceptors are especially defined as weak functions (so that they don't
843 // cause link errors when user defines them as well). So they silently
844 // auto-disable themselves when such symbol is already present in the binary. If
845 // we link libstdc++ statically, it will bring own __cxa_guard_acquire which
846 // will silently replace our interceptor. That's why on Linux we simply export
847 // these interceptors with INTERFACE_ATTRIBUTE.
848 // On OS X, we don't support statically linking, so we just use a regular
849 // interceptor.
850 #if SANITIZER_MAC
851 #define STDCXX_INTERCEPTOR TSAN_INTERCEPTOR
852 #else
853 #define STDCXX_INTERCEPTOR(rettype, name, ...) \
854 extern "C" rettype INTERFACE_ATTRIBUTE name(__VA_ARGS__)
855 #endif
856
857 // Used in thread-safe function static initialization.
STDCXX_INTERCEPTOR(int,__cxa_guard_acquire,atomic_uint32_t * g)858 STDCXX_INTERCEPTOR(int, __cxa_guard_acquire, atomic_uint32_t *g) {
859 SCOPED_INTERCEPTOR_RAW(__cxa_guard_acquire, g);
860 OnPotentiallyBlockingRegionBegin();
861 auto on_exit = at_scope_exit(&OnPotentiallyBlockingRegionEnd);
862 for (;;) {
863 u32 cmp = atomic_load(g, memory_order_acquire);
864 if (cmp == 0) {
865 if (atomic_compare_exchange_strong(g, &cmp, 1<<16, memory_order_relaxed))
866 return 1;
867 } else if (cmp == 1) {
868 Acquire(thr, pc, (uptr)g);
869 return 0;
870 } else {
871 internal_sched_yield();
872 }
873 }
874 }
875
STDCXX_INTERCEPTOR(void,__cxa_guard_release,atomic_uint32_t * g)876 STDCXX_INTERCEPTOR(void, __cxa_guard_release, atomic_uint32_t *g) {
877 SCOPED_INTERCEPTOR_RAW(__cxa_guard_release, g);
878 Release(thr, pc, (uptr)g);
879 atomic_store(g, 1, memory_order_release);
880 }
881
STDCXX_INTERCEPTOR(void,__cxa_guard_abort,atomic_uint32_t * g)882 STDCXX_INTERCEPTOR(void, __cxa_guard_abort, atomic_uint32_t *g) {
883 SCOPED_INTERCEPTOR_RAW(__cxa_guard_abort, g);
884 atomic_store(g, 0, memory_order_relaxed);
885 }
886
887 namespace __tsan {
DestroyThreadState()888 void DestroyThreadState() {
889 ThreadState *thr = cur_thread();
890 Processor *proc = thr->proc();
891 ThreadFinish(thr);
892 ProcUnwire(proc, thr);
893 ProcDestroy(proc);
894 DTLS_Destroy();
895 cur_thread_finalize();
896 }
897
PlatformCleanUpThreadState(ThreadState * thr)898 void PlatformCleanUpThreadState(ThreadState *thr) {
899 ThreadSignalContext *sctx = thr->signal_ctx;
900 if (sctx) {
901 thr->signal_ctx = 0;
902 UnmapOrDie(sctx, sizeof(*sctx));
903 }
904 }
905 } // namespace __tsan
906
907 #if !SANITIZER_MAC && !SANITIZER_NETBSD && !SANITIZER_FREEBSD
thread_finalize(void * v)908 static void thread_finalize(void *v) {
909 uptr iter = (uptr)v;
910 if (iter > 1) {
911 if (pthread_setspecific(interceptor_ctx()->finalize_key,
912 (void*)(iter - 1))) {
913 Printf("ThreadSanitizer: failed to set thread key\n");
914 Die();
915 }
916 return;
917 }
918 DestroyThreadState();
919 }
920 #endif
921
922
923 struct ThreadParam {
924 void* (*callback)(void *arg);
925 void *param;
926 atomic_uintptr_t tid;
927 };
928
__tsan_thread_start_func(void * arg)929 extern "C" void *__tsan_thread_start_func(void *arg) {
930 ThreadParam *p = (ThreadParam*)arg;
931 void* (*callback)(void *arg) = p->callback;
932 void *param = p->param;
933 int tid = 0;
934 {
935 cur_thread_init();
936 ThreadState *thr = cur_thread();
937 // Thread-local state is not initialized yet.
938 ScopedIgnoreInterceptors ignore;
939 #if !SANITIZER_MAC && !SANITIZER_NETBSD && !SANITIZER_FREEBSD
940 ThreadIgnoreBegin(thr, 0);
941 if (pthread_setspecific(interceptor_ctx()->finalize_key,
942 (void *)GetPthreadDestructorIterations())) {
943 Printf("ThreadSanitizer: failed to set thread key\n");
944 Die();
945 }
946 ThreadIgnoreEnd(thr, 0);
947 #endif
948 while ((tid = atomic_load(&p->tid, memory_order_acquire)) == 0)
949 internal_sched_yield();
950 Processor *proc = ProcCreate();
951 ProcWire(proc, thr);
952 ThreadStart(thr, tid, GetTid(), ThreadType::Regular);
953 atomic_store(&p->tid, 0, memory_order_release);
954 }
955 void *res = callback(param);
956 // Prevent the callback from being tail called,
957 // it mixes up stack traces.
958 volatile int foo = 42;
959 foo++;
960 return res;
961 }
962
TSAN_INTERCEPTOR(int,pthread_create,void * th,void * attr,void * (* callback)(void *),void * param)963 TSAN_INTERCEPTOR(int, pthread_create,
964 void *th, void *attr, void *(*callback)(void*), void * param) {
965 SCOPED_INTERCEPTOR_RAW(pthread_create, th, attr, callback, param);
966
967 MaybeSpawnBackgroundThread();
968
969 if (ctx->after_multithreaded_fork) {
970 if (flags()->die_after_fork) {
971 Report("ThreadSanitizer: starting new threads after multi-threaded "
972 "fork is not supported. Dying (set die_after_fork=0 to override)\n");
973 Die();
974 } else {
975 VPrintf(1, "ThreadSanitizer: starting new threads after multi-threaded "
976 "fork is not supported (pid %d). Continuing because of "
977 "die_after_fork=0, but you are on your own\n", internal_getpid());
978 }
979 }
980 __sanitizer_pthread_attr_t myattr;
981 if (attr == 0) {
982 pthread_attr_init(&myattr);
983 attr = &myattr;
984 }
985 int detached = 0;
986 REAL(pthread_attr_getdetachstate)(attr, &detached);
987 AdjustStackSize(attr);
988
989 ThreadParam p;
990 p.callback = callback;
991 p.param = param;
992 atomic_store(&p.tid, 0, memory_order_relaxed);
993 int res = -1;
994 {
995 // Otherwise we see false positives in pthread stack manipulation.
996 ScopedIgnoreInterceptors ignore;
997 ThreadIgnoreBegin(thr, pc);
998 res = REAL(pthread_create)(th, attr, __tsan_thread_start_func, &p);
999 ThreadIgnoreEnd(thr, pc);
1000 }
1001 if (res == 0) {
1002 int tid = ThreadCreate(thr, pc, *(uptr*)th, IsStateDetached(detached));
1003 CHECK_NE(tid, 0);
1004 // Synchronization on p.tid serves two purposes:
1005 // 1. ThreadCreate must finish before the new thread starts.
1006 // Otherwise the new thread can call pthread_detach, but the pthread_t
1007 // identifier is not yet registered in ThreadRegistry by ThreadCreate.
1008 // 2. ThreadStart must finish before this thread continues.
1009 // Otherwise, this thread can call pthread_detach and reset thr->sync
1010 // before the new thread got a chance to acquire from it in ThreadStart.
1011 atomic_store(&p.tid, tid, memory_order_release);
1012 while (atomic_load(&p.tid, memory_order_acquire) != 0)
1013 internal_sched_yield();
1014 }
1015 if (attr == &myattr)
1016 pthread_attr_destroy(&myattr);
1017 return res;
1018 }
1019
TSAN_INTERCEPTOR(int,pthread_join,void * th,void ** ret)1020 TSAN_INTERCEPTOR(int, pthread_join, void *th, void **ret) {
1021 SCOPED_INTERCEPTOR_RAW(pthread_join, th, ret);
1022 int tid = ThreadConsumeTid(thr, pc, (uptr)th);
1023 ThreadIgnoreBegin(thr, pc);
1024 int res = BLOCK_REAL(pthread_join)(th, ret);
1025 ThreadIgnoreEnd(thr, pc);
1026 if (res == 0) {
1027 ThreadJoin(thr, pc, tid);
1028 }
1029 return res;
1030 }
1031
1032 DEFINE_REAL_PTHREAD_FUNCTIONS
1033
TSAN_INTERCEPTOR(int,pthread_detach,void * th)1034 TSAN_INTERCEPTOR(int, pthread_detach, void *th) {
1035 SCOPED_INTERCEPTOR_RAW(pthread_detach, th);
1036 int tid = ThreadConsumeTid(thr, pc, (uptr)th);
1037 int res = REAL(pthread_detach)(th);
1038 if (res == 0) {
1039 ThreadDetach(thr, pc, tid);
1040 }
1041 return res;
1042 }
1043
TSAN_INTERCEPTOR(void,pthread_exit,void * retval)1044 TSAN_INTERCEPTOR(void, pthread_exit, void *retval) {
1045 {
1046 SCOPED_INTERCEPTOR_RAW(pthread_exit, retval);
1047 #if !SANITIZER_MAC && !SANITIZER_ANDROID
1048 CHECK_EQ(thr, &cur_thread_placeholder);
1049 #endif
1050 }
1051 REAL(pthread_exit)(retval);
1052 }
1053
1054 #if SANITIZER_LINUX
TSAN_INTERCEPTOR(int,pthread_tryjoin_np,void * th,void ** ret)1055 TSAN_INTERCEPTOR(int, pthread_tryjoin_np, void *th, void **ret) {
1056 SCOPED_INTERCEPTOR_RAW(pthread_tryjoin_np, th, ret);
1057 int tid = ThreadConsumeTid(thr, pc, (uptr)th);
1058 ThreadIgnoreBegin(thr, pc);
1059 int res = REAL(pthread_tryjoin_np)(th, ret);
1060 ThreadIgnoreEnd(thr, pc);
1061 if (res == 0)
1062 ThreadJoin(thr, pc, tid);
1063 else
1064 ThreadNotJoined(thr, pc, tid, (uptr)th);
1065 return res;
1066 }
1067
TSAN_INTERCEPTOR(int,pthread_timedjoin_np,void * th,void ** ret,const struct timespec * abstime)1068 TSAN_INTERCEPTOR(int, pthread_timedjoin_np, void *th, void **ret,
1069 const struct timespec *abstime) {
1070 SCOPED_INTERCEPTOR_RAW(pthread_timedjoin_np, th, ret, abstime);
1071 int tid = ThreadConsumeTid(thr, pc, (uptr)th);
1072 ThreadIgnoreBegin(thr, pc);
1073 int res = BLOCK_REAL(pthread_timedjoin_np)(th, ret, abstime);
1074 ThreadIgnoreEnd(thr, pc);
1075 if (res == 0)
1076 ThreadJoin(thr, pc, tid);
1077 else
1078 ThreadNotJoined(thr, pc, tid, (uptr)th);
1079 return res;
1080 }
1081 #endif
1082
1083 // Problem:
1084 // NPTL implementation of pthread_cond has 2 versions (2.2.5 and 2.3.2).
1085 // pthread_cond_t has different size in the different versions.
1086 // If call new REAL functions for old pthread_cond_t, they will corrupt memory
1087 // after pthread_cond_t (old cond is smaller).
1088 // If we call old REAL functions for new pthread_cond_t, we will lose some
1089 // functionality (e.g. old functions do not support waiting against
1090 // CLOCK_REALTIME).
1091 // Proper handling would require to have 2 versions of interceptors as well.
1092 // But this is messy, in particular requires linker scripts when sanitizer
1093 // runtime is linked into a shared library.
1094 // Instead we assume we don't have dynamic libraries built against old
1095 // pthread (2.2.5 is dated by 2002). And provide legacy_pthread_cond flag
1096 // that allows to work with old libraries (but this mode does not support
1097 // some features, e.g. pthread_condattr_getpshared).
init_cond(void * c,bool force=false)1098 static void *init_cond(void *c, bool force = false) {
1099 // sizeof(pthread_cond_t) >= sizeof(uptr) in both versions.
1100 // So we allocate additional memory on the side large enough to hold
1101 // any pthread_cond_t object. Always call new REAL functions, but pass
1102 // the aux object to them.
1103 // Note: the code assumes that PTHREAD_COND_INITIALIZER initializes
1104 // first word of pthread_cond_t to zero.
1105 // It's all relevant only for linux.
1106 if (!common_flags()->legacy_pthread_cond)
1107 return c;
1108 atomic_uintptr_t *p = (atomic_uintptr_t*)c;
1109 uptr cond = atomic_load(p, memory_order_acquire);
1110 if (!force && cond != 0)
1111 return (void*)cond;
1112 void *newcond = WRAP(malloc)(pthread_cond_t_sz);
1113 internal_memset(newcond, 0, pthread_cond_t_sz);
1114 if (atomic_compare_exchange_strong(p, &cond, (uptr)newcond,
1115 memory_order_acq_rel))
1116 return newcond;
1117 WRAP(free)(newcond);
1118 return (void*)cond;
1119 }
1120
1121 namespace {
1122
1123 template <class Fn>
1124 struct CondMutexUnlockCtx {
1125 ScopedInterceptor *si;
1126 ThreadState *thr;
1127 uptr pc;
1128 void *m;
1129 void *c;
1130 const Fn &fn;
1131
Cancel__anon45c2911e0111::CondMutexUnlockCtx1132 int Cancel() const { return fn(); }
1133 void Unlock() const;
1134 };
1135
1136 template <class Fn>
Unlock() const1137 void CondMutexUnlockCtx<Fn>::Unlock() const {
1138 // pthread_cond_wait interceptor has enabled async signal delivery
1139 // (see BlockingCall below). Disable async signals since we are running
1140 // tsan code. Also ScopedInterceptor and BlockingCall destructors won't run
1141 // since the thread is cancelled, so we have to manually execute them
1142 // (the thread still can run some user code due to pthread_cleanup_push).
1143 ThreadSignalContext *ctx = SigCtx(thr);
1144 CHECK_EQ(atomic_load(&ctx->in_blocking_func, memory_order_relaxed), 1);
1145 atomic_store(&ctx->in_blocking_func, 0, memory_order_relaxed);
1146 MutexPostLock(thr, pc, (uptr)m, MutexFlagDoPreLockOnPostLock);
1147 // Undo BlockingCall ctor effects.
1148 thr->ignore_interceptors--;
1149 si->~ScopedInterceptor();
1150 }
1151 } // namespace
1152
INTERCEPTOR(int,pthread_cond_init,void * c,void * a)1153 INTERCEPTOR(int, pthread_cond_init, void *c, void *a) {
1154 void *cond = init_cond(c, true);
1155 SCOPED_TSAN_INTERCEPTOR(pthread_cond_init, cond, a);
1156 MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), true);
1157 return REAL(pthread_cond_init)(cond, a);
1158 }
1159
1160 template <class Fn>
cond_wait(ThreadState * thr,uptr pc,ScopedInterceptor * si,const Fn & fn,void * c,void * m)1161 int cond_wait(ThreadState *thr, uptr pc, ScopedInterceptor *si, const Fn &fn,
1162 void *c, void *m) {
1163 MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), false);
1164 MutexUnlock(thr, pc, (uptr)m);
1165 int res = 0;
1166 // This ensures that we handle mutex lock even in case of pthread_cancel.
1167 // See test/tsan/cond_cancel.cpp.
1168 {
1169 // Enable signal delivery while the thread is blocked.
1170 BlockingCall bc(thr);
1171 CondMutexUnlockCtx<Fn> arg = {si, thr, pc, m, c, fn};
1172 res = call_pthread_cancel_with_cleanup(
1173 [](void *arg) -> int {
1174 return ((const CondMutexUnlockCtx<Fn> *)arg)->Cancel();
1175 },
1176 [](void *arg) { ((const CondMutexUnlockCtx<Fn> *)arg)->Unlock(); },
1177 &arg);
1178 }
1179 if (res == errno_EOWNERDEAD) MutexRepair(thr, pc, (uptr)m);
1180 MutexPostLock(thr, pc, (uptr)m, MutexFlagDoPreLockOnPostLock);
1181 return res;
1182 }
1183
INTERCEPTOR(int,pthread_cond_wait,void * c,void * m)1184 INTERCEPTOR(int, pthread_cond_wait, void *c, void *m) {
1185 void *cond = init_cond(c);
1186 SCOPED_TSAN_INTERCEPTOR(pthread_cond_wait, cond, m);
1187 return cond_wait(
1188 thr, pc, &si, [=]() { return REAL(pthread_cond_wait)(cond, m); }, cond,
1189 m);
1190 }
1191
INTERCEPTOR(int,pthread_cond_timedwait,void * c,void * m,void * abstime)1192 INTERCEPTOR(int, pthread_cond_timedwait, void *c, void *m, void *abstime) {
1193 void *cond = init_cond(c);
1194 SCOPED_TSAN_INTERCEPTOR(pthread_cond_timedwait, cond, m, abstime);
1195 return cond_wait(
1196 thr, pc, &si,
1197 [=]() { return REAL(pthread_cond_timedwait)(cond, m, abstime); }, cond,
1198 m);
1199 }
1200
1201 #if SANITIZER_LINUX
INTERCEPTOR(int,pthread_cond_clockwait,void * c,void * m,__sanitizer_clockid_t clock,void * abstime)1202 INTERCEPTOR(int, pthread_cond_clockwait, void *c, void *m,
1203 __sanitizer_clockid_t clock, void *abstime) {
1204 void *cond = init_cond(c);
1205 SCOPED_TSAN_INTERCEPTOR(pthread_cond_clockwait, cond, m, clock, abstime);
1206 return cond_wait(
1207 thr, pc, &si,
1208 [=]() { return REAL(pthread_cond_clockwait)(cond, m, clock, abstime); },
1209 cond, m);
1210 }
1211 #define TSAN_MAYBE_PTHREAD_COND_CLOCKWAIT TSAN_INTERCEPT(pthread_cond_clockwait)
1212 #else
1213 #define TSAN_MAYBE_PTHREAD_COND_CLOCKWAIT
1214 #endif
1215
1216 #if SANITIZER_MAC
INTERCEPTOR(int,pthread_cond_timedwait_relative_np,void * c,void * m,void * reltime)1217 INTERCEPTOR(int, pthread_cond_timedwait_relative_np, void *c, void *m,
1218 void *reltime) {
1219 void *cond = init_cond(c);
1220 SCOPED_TSAN_INTERCEPTOR(pthread_cond_timedwait_relative_np, cond, m, reltime);
1221 return cond_wait(
1222 thr, pc, &si,
1223 [=]() {
1224 return REAL(pthread_cond_timedwait_relative_np)(cond, m, reltime);
1225 },
1226 cond, m);
1227 }
1228 #endif
1229
INTERCEPTOR(int,pthread_cond_signal,void * c)1230 INTERCEPTOR(int, pthread_cond_signal, void *c) {
1231 void *cond = init_cond(c);
1232 SCOPED_TSAN_INTERCEPTOR(pthread_cond_signal, cond);
1233 MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), false);
1234 return REAL(pthread_cond_signal)(cond);
1235 }
1236
INTERCEPTOR(int,pthread_cond_broadcast,void * c)1237 INTERCEPTOR(int, pthread_cond_broadcast, void *c) {
1238 void *cond = init_cond(c);
1239 SCOPED_TSAN_INTERCEPTOR(pthread_cond_broadcast, cond);
1240 MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), false);
1241 return REAL(pthread_cond_broadcast)(cond);
1242 }
1243
INTERCEPTOR(int,pthread_cond_destroy,void * c)1244 INTERCEPTOR(int, pthread_cond_destroy, void *c) {
1245 void *cond = init_cond(c);
1246 SCOPED_TSAN_INTERCEPTOR(pthread_cond_destroy, cond);
1247 MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), true);
1248 int res = REAL(pthread_cond_destroy)(cond);
1249 if (common_flags()->legacy_pthread_cond) {
1250 // Free our aux cond and zero the pointer to not leave dangling pointers.
1251 WRAP(free)(cond);
1252 atomic_store((atomic_uintptr_t*)c, 0, memory_order_relaxed);
1253 }
1254 return res;
1255 }
1256
TSAN_INTERCEPTOR(int,pthread_mutex_init,void * m,void * a)1257 TSAN_INTERCEPTOR(int, pthread_mutex_init, void *m, void *a) {
1258 SCOPED_TSAN_INTERCEPTOR(pthread_mutex_init, m, a);
1259 int res = REAL(pthread_mutex_init)(m, a);
1260 if (res == 0) {
1261 u32 flagz = 0;
1262 if (a) {
1263 int type = 0;
1264 if (REAL(pthread_mutexattr_gettype)(a, &type) == 0)
1265 if (type == PTHREAD_MUTEX_RECURSIVE ||
1266 type == PTHREAD_MUTEX_RECURSIVE_NP)
1267 flagz |= MutexFlagWriteReentrant;
1268 }
1269 MutexCreate(thr, pc, (uptr)m, flagz);
1270 }
1271 return res;
1272 }
1273
TSAN_INTERCEPTOR(int,pthread_mutex_destroy,void * m)1274 TSAN_INTERCEPTOR(int, pthread_mutex_destroy, void *m) {
1275 SCOPED_TSAN_INTERCEPTOR(pthread_mutex_destroy, m);
1276 int res = REAL(pthread_mutex_destroy)(m);
1277 if (res == 0 || res == errno_EBUSY) {
1278 MutexDestroy(thr, pc, (uptr)m);
1279 }
1280 return res;
1281 }
1282
TSAN_INTERCEPTOR(int,pthread_mutex_trylock,void * m)1283 TSAN_INTERCEPTOR(int, pthread_mutex_trylock, void *m) {
1284 SCOPED_TSAN_INTERCEPTOR(pthread_mutex_trylock, m);
1285 int res = REAL(pthread_mutex_trylock)(m);
1286 if (res == errno_EOWNERDEAD)
1287 MutexRepair(thr, pc, (uptr)m);
1288 if (res == 0 || res == errno_EOWNERDEAD)
1289 MutexPostLock(thr, pc, (uptr)m, MutexFlagTryLock);
1290 return res;
1291 }
1292
1293 #if !SANITIZER_MAC
TSAN_INTERCEPTOR(int,pthread_mutex_timedlock,void * m,void * abstime)1294 TSAN_INTERCEPTOR(int, pthread_mutex_timedlock, void *m, void *abstime) {
1295 SCOPED_TSAN_INTERCEPTOR(pthread_mutex_timedlock, m, abstime);
1296 int res = REAL(pthread_mutex_timedlock)(m, abstime);
1297 if (res == 0) {
1298 MutexPostLock(thr, pc, (uptr)m, MutexFlagTryLock);
1299 }
1300 return res;
1301 }
1302 #endif
1303
1304 #if !SANITIZER_MAC
TSAN_INTERCEPTOR(int,pthread_spin_init,void * m,int pshared)1305 TSAN_INTERCEPTOR(int, pthread_spin_init, void *m, int pshared) {
1306 SCOPED_TSAN_INTERCEPTOR(pthread_spin_init, m, pshared);
1307 int res = REAL(pthread_spin_init)(m, pshared);
1308 if (res == 0) {
1309 MutexCreate(thr, pc, (uptr)m);
1310 }
1311 return res;
1312 }
1313
TSAN_INTERCEPTOR(int,pthread_spin_destroy,void * m)1314 TSAN_INTERCEPTOR(int, pthread_spin_destroy, void *m) {
1315 SCOPED_TSAN_INTERCEPTOR(pthread_spin_destroy, m);
1316 int res = REAL(pthread_spin_destroy)(m);
1317 if (res == 0) {
1318 MutexDestroy(thr, pc, (uptr)m);
1319 }
1320 return res;
1321 }
1322
TSAN_INTERCEPTOR(int,pthread_spin_lock,void * m)1323 TSAN_INTERCEPTOR(int, pthread_spin_lock, void *m) {
1324 SCOPED_TSAN_INTERCEPTOR(pthread_spin_lock, m);
1325 MutexPreLock(thr, pc, (uptr)m);
1326 int res = REAL(pthread_spin_lock)(m);
1327 if (res == 0) {
1328 MutexPostLock(thr, pc, (uptr)m);
1329 }
1330 return res;
1331 }
1332
TSAN_INTERCEPTOR(int,pthread_spin_trylock,void * m)1333 TSAN_INTERCEPTOR(int, pthread_spin_trylock, void *m) {
1334 SCOPED_TSAN_INTERCEPTOR(pthread_spin_trylock, m);
1335 int res = REAL(pthread_spin_trylock)(m);
1336 if (res == 0) {
1337 MutexPostLock(thr, pc, (uptr)m, MutexFlagTryLock);
1338 }
1339 return res;
1340 }
1341
TSAN_INTERCEPTOR(int,pthread_spin_unlock,void * m)1342 TSAN_INTERCEPTOR(int, pthread_spin_unlock, void *m) {
1343 SCOPED_TSAN_INTERCEPTOR(pthread_spin_unlock, m);
1344 MutexUnlock(thr, pc, (uptr)m);
1345 int res = REAL(pthread_spin_unlock)(m);
1346 return res;
1347 }
1348 #endif
1349
TSAN_INTERCEPTOR(int,pthread_rwlock_init,void * m,void * a)1350 TSAN_INTERCEPTOR(int, pthread_rwlock_init, void *m, void *a) {
1351 SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_init, m, a);
1352 int res = REAL(pthread_rwlock_init)(m, a);
1353 if (res == 0) {
1354 MutexCreate(thr, pc, (uptr)m);
1355 }
1356 return res;
1357 }
1358
TSAN_INTERCEPTOR(int,pthread_rwlock_destroy,void * m)1359 TSAN_INTERCEPTOR(int, pthread_rwlock_destroy, void *m) {
1360 SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_destroy, m);
1361 int res = REAL(pthread_rwlock_destroy)(m);
1362 if (res == 0) {
1363 MutexDestroy(thr, pc, (uptr)m);
1364 }
1365 return res;
1366 }
1367
TSAN_INTERCEPTOR(int,pthread_rwlock_rdlock,void * m)1368 TSAN_INTERCEPTOR(int, pthread_rwlock_rdlock, void *m) {
1369 SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_rdlock, m);
1370 MutexPreReadLock(thr, pc, (uptr)m);
1371 int res = REAL(pthread_rwlock_rdlock)(m);
1372 if (res == 0) {
1373 MutexPostReadLock(thr, pc, (uptr)m);
1374 }
1375 return res;
1376 }
1377
TSAN_INTERCEPTOR(int,pthread_rwlock_tryrdlock,void * m)1378 TSAN_INTERCEPTOR(int, pthread_rwlock_tryrdlock, void *m) {
1379 SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_tryrdlock, m);
1380 int res = REAL(pthread_rwlock_tryrdlock)(m);
1381 if (res == 0) {
1382 MutexPostReadLock(thr, pc, (uptr)m, MutexFlagTryLock);
1383 }
1384 return res;
1385 }
1386
1387 #if !SANITIZER_MAC
TSAN_INTERCEPTOR(int,pthread_rwlock_timedrdlock,void * m,void * abstime)1388 TSAN_INTERCEPTOR(int, pthread_rwlock_timedrdlock, void *m, void *abstime) {
1389 SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedrdlock, m, abstime);
1390 int res = REAL(pthread_rwlock_timedrdlock)(m, abstime);
1391 if (res == 0) {
1392 MutexPostReadLock(thr, pc, (uptr)m);
1393 }
1394 return res;
1395 }
1396 #endif
1397
TSAN_INTERCEPTOR(int,pthread_rwlock_wrlock,void * m)1398 TSAN_INTERCEPTOR(int, pthread_rwlock_wrlock, void *m) {
1399 SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_wrlock, m);
1400 MutexPreLock(thr, pc, (uptr)m);
1401 int res = REAL(pthread_rwlock_wrlock)(m);
1402 if (res == 0) {
1403 MutexPostLock(thr, pc, (uptr)m);
1404 }
1405 return res;
1406 }
1407
TSAN_INTERCEPTOR(int,pthread_rwlock_trywrlock,void * m)1408 TSAN_INTERCEPTOR(int, pthread_rwlock_trywrlock, void *m) {
1409 SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_trywrlock, m);
1410 int res = REAL(pthread_rwlock_trywrlock)(m);
1411 if (res == 0) {
1412 MutexPostLock(thr, pc, (uptr)m, MutexFlagTryLock);
1413 }
1414 return res;
1415 }
1416
1417 #if !SANITIZER_MAC
TSAN_INTERCEPTOR(int,pthread_rwlock_timedwrlock,void * m,void * abstime)1418 TSAN_INTERCEPTOR(int, pthread_rwlock_timedwrlock, void *m, void *abstime) {
1419 SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedwrlock, m, abstime);
1420 int res = REAL(pthread_rwlock_timedwrlock)(m, abstime);
1421 if (res == 0) {
1422 MutexPostLock(thr, pc, (uptr)m, MutexFlagTryLock);
1423 }
1424 return res;
1425 }
1426 #endif
1427
TSAN_INTERCEPTOR(int,pthread_rwlock_unlock,void * m)1428 TSAN_INTERCEPTOR(int, pthread_rwlock_unlock, void *m) {
1429 SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_unlock, m);
1430 MutexReadOrWriteUnlock(thr, pc, (uptr)m);
1431 int res = REAL(pthread_rwlock_unlock)(m);
1432 return res;
1433 }
1434
1435 #if !SANITIZER_MAC
TSAN_INTERCEPTOR(int,pthread_barrier_init,void * b,void * a,unsigned count)1436 TSAN_INTERCEPTOR(int, pthread_barrier_init, void *b, void *a, unsigned count) {
1437 SCOPED_TSAN_INTERCEPTOR(pthread_barrier_init, b, a, count);
1438 MemoryWrite(thr, pc, (uptr)b, kSizeLog1);
1439 int res = REAL(pthread_barrier_init)(b, a, count);
1440 return res;
1441 }
1442
TSAN_INTERCEPTOR(int,pthread_barrier_destroy,void * b)1443 TSAN_INTERCEPTOR(int, pthread_barrier_destroy, void *b) {
1444 SCOPED_TSAN_INTERCEPTOR(pthread_barrier_destroy, b);
1445 MemoryWrite(thr, pc, (uptr)b, kSizeLog1);
1446 int res = REAL(pthread_barrier_destroy)(b);
1447 return res;
1448 }
1449
TSAN_INTERCEPTOR(int,pthread_barrier_wait,void * b)1450 TSAN_INTERCEPTOR(int, pthread_barrier_wait, void *b) {
1451 SCOPED_TSAN_INTERCEPTOR(pthread_barrier_wait, b);
1452 Release(thr, pc, (uptr)b);
1453 MemoryRead(thr, pc, (uptr)b, kSizeLog1);
1454 int res = REAL(pthread_barrier_wait)(b);
1455 MemoryRead(thr, pc, (uptr)b, kSizeLog1);
1456 if (res == 0 || res == PTHREAD_BARRIER_SERIAL_THREAD) {
1457 Acquire(thr, pc, (uptr)b);
1458 }
1459 return res;
1460 }
1461 #endif
1462
TSAN_INTERCEPTOR(int,pthread_once,void * o,void (* f)())1463 TSAN_INTERCEPTOR(int, pthread_once, void *o, void (*f)()) {
1464 SCOPED_INTERCEPTOR_RAW(pthread_once, o, f);
1465 if (o == 0 || f == 0)
1466 return errno_EINVAL;
1467 atomic_uint32_t *a;
1468
1469 if (SANITIZER_MAC)
1470 a = static_cast<atomic_uint32_t*>((void *)((char *)o + sizeof(long_t)));
1471 else if (SANITIZER_NETBSD)
1472 a = static_cast<atomic_uint32_t*>
1473 ((void *)((char *)o + __sanitizer::pthread_mutex_t_sz));
1474 else
1475 a = static_cast<atomic_uint32_t*>(o);
1476
1477 u32 v = atomic_load(a, memory_order_acquire);
1478 if (v == 0 && atomic_compare_exchange_strong(a, &v, 1,
1479 memory_order_relaxed)) {
1480 (*f)();
1481 if (!thr->in_ignored_lib)
1482 Release(thr, pc, (uptr)o);
1483 atomic_store(a, 2, memory_order_release);
1484 } else {
1485 while (v != 2) {
1486 internal_sched_yield();
1487 v = atomic_load(a, memory_order_acquire);
1488 }
1489 if (!thr->in_ignored_lib)
1490 Acquire(thr, pc, (uptr)o);
1491 }
1492 return 0;
1493 }
1494
1495 #if SANITIZER_LINUX && !SANITIZER_ANDROID
TSAN_INTERCEPTOR(int,__fxstat,int version,int fd,void * buf)1496 TSAN_INTERCEPTOR(int, __fxstat, int version, int fd, void *buf) {
1497 SCOPED_TSAN_INTERCEPTOR(__fxstat, version, fd, buf);
1498 if (fd > 0)
1499 FdAccess(thr, pc, fd);
1500 return REAL(__fxstat)(version, fd, buf);
1501 }
1502 #define TSAN_MAYBE_INTERCEPT___FXSTAT TSAN_INTERCEPT(__fxstat)
1503 #else
1504 #define TSAN_MAYBE_INTERCEPT___FXSTAT
1505 #endif
1506
TSAN_INTERCEPTOR(int,fstat,int fd,void * buf)1507 TSAN_INTERCEPTOR(int, fstat, int fd, void *buf) {
1508 #if SANITIZER_FREEBSD || SANITIZER_MAC || SANITIZER_ANDROID || SANITIZER_NETBSD
1509 SCOPED_TSAN_INTERCEPTOR(fstat, fd, buf);
1510 if (fd > 0)
1511 FdAccess(thr, pc, fd);
1512 return REAL(fstat)(fd, buf);
1513 #else
1514 SCOPED_TSAN_INTERCEPTOR(__fxstat, 0, fd, buf);
1515 if (fd > 0)
1516 FdAccess(thr, pc, fd);
1517 return REAL(__fxstat)(0, fd, buf);
1518 #endif
1519 }
1520
1521 #if SANITIZER_LINUX && !SANITIZER_ANDROID
TSAN_INTERCEPTOR(int,__fxstat64,int version,int fd,void * buf)1522 TSAN_INTERCEPTOR(int, __fxstat64, int version, int fd, void *buf) {
1523 SCOPED_TSAN_INTERCEPTOR(__fxstat64, version, fd, buf);
1524 if (fd > 0)
1525 FdAccess(thr, pc, fd);
1526 return REAL(__fxstat64)(version, fd, buf);
1527 }
1528 #define TSAN_MAYBE_INTERCEPT___FXSTAT64 TSAN_INTERCEPT(__fxstat64)
1529 #else
1530 #define TSAN_MAYBE_INTERCEPT___FXSTAT64
1531 #endif
1532
1533 #if SANITIZER_LINUX && !SANITIZER_ANDROID
TSAN_INTERCEPTOR(int,fstat64,int fd,void * buf)1534 TSAN_INTERCEPTOR(int, fstat64, int fd, void *buf) {
1535 SCOPED_TSAN_INTERCEPTOR(__fxstat64, 0, fd, buf);
1536 if (fd > 0)
1537 FdAccess(thr, pc, fd);
1538 return REAL(__fxstat64)(0, fd, buf);
1539 }
1540 #define TSAN_MAYBE_INTERCEPT_FSTAT64 TSAN_INTERCEPT(fstat64)
1541 #else
1542 #define TSAN_MAYBE_INTERCEPT_FSTAT64
1543 #endif
1544
TSAN_INTERCEPTOR(int,open,const char * name,int oflag,...)1545 TSAN_INTERCEPTOR(int, open, const char *name, int oflag, ...) {
1546 va_list ap;
1547 va_start(ap, oflag);
1548 mode_t mode = va_arg(ap, int);
1549 va_end(ap);
1550 SCOPED_TSAN_INTERCEPTOR(open, name, oflag, mode);
1551 READ_STRING(thr, pc, name, 0);
1552 int fd = REAL(open)(name, oflag, mode);
1553 if (fd >= 0)
1554 FdFileCreate(thr, pc, fd);
1555 return fd;
1556 }
1557
1558 #if SANITIZER_LINUX
TSAN_INTERCEPTOR(int,open64,const char * name,int oflag,...)1559 TSAN_INTERCEPTOR(int, open64, const char *name, int oflag, ...) {
1560 va_list ap;
1561 va_start(ap, oflag);
1562 mode_t mode = va_arg(ap, int);
1563 va_end(ap);
1564 SCOPED_TSAN_INTERCEPTOR(open64, name, oflag, mode);
1565 READ_STRING(thr, pc, name, 0);
1566 int fd = REAL(open64)(name, oflag, mode);
1567 if (fd >= 0)
1568 FdFileCreate(thr, pc, fd);
1569 return fd;
1570 }
1571 #define TSAN_MAYBE_INTERCEPT_OPEN64 TSAN_INTERCEPT(open64)
1572 #else
1573 #define TSAN_MAYBE_INTERCEPT_OPEN64
1574 #endif
1575
TSAN_INTERCEPTOR(int,creat,const char * name,int mode)1576 TSAN_INTERCEPTOR(int, creat, const char *name, int mode) {
1577 SCOPED_TSAN_INTERCEPTOR(creat, name, mode);
1578 READ_STRING(thr, pc, name, 0);
1579 int fd = REAL(creat)(name, mode);
1580 if (fd >= 0)
1581 FdFileCreate(thr, pc, fd);
1582 return fd;
1583 }
1584
1585 #if SANITIZER_LINUX
TSAN_INTERCEPTOR(int,creat64,const char * name,int mode)1586 TSAN_INTERCEPTOR(int, creat64, const char *name, int mode) {
1587 SCOPED_TSAN_INTERCEPTOR(creat64, name, mode);
1588 READ_STRING(thr, pc, name, 0);
1589 int fd = REAL(creat64)(name, mode);
1590 if (fd >= 0)
1591 FdFileCreate(thr, pc, fd);
1592 return fd;
1593 }
1594 #define TSAN_MAYBE_INTERCEPT_CREAT64 TSAN_INTERCEPT(creat64)
1595 #else
1596 #define TSAN_MAYBE_INTERCEPT_CREAT64
1597 #endif
1598
TSAN_INTERCEPTOR(int,dup,int oldfd)1599 TSAN_INTERCEPTOR(int, dup, int oldfd) {
1600 SCOPED_TSAN_INTERCEPTOR(dup, oldfd);
1601 int newfd = REAL(dup)(oldfd);
1602 if (oldfd >= 0 && newfd >= 0 && newfd != oldfd)
1603 FdDup(thr, pc, oldfd, newfd, true);
1604 return newfd;
1605 }
1606
TSAN_INTERCEPTOR(int,dup2,int oldfd,int newfd)1607 TSAN_INTERCEPTOR(int, dup2, int oldfd, int newfd) {
1608 SCOPED_TSAN_INTERCEPTOR(dup2, oldfd, newfd);
1609 int newfd2 = REAL(dup2)(oldfd, newfd);
1610 if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
1611 FdDup(thr, pc, oldfd, newfd2, false);
1612 return newfd2;
1613 }
1614
1615 #if !SANITIZER_MAC
TSAN_INTERCEPTOR(int,dup3,int oldfd,int newfd,int flags)1616 TSAN_INTERCEPTOR(int, dup3, int oldfd, int newfd, int flags) {
1617 SCOPED_TSAN_INTERCEPTOR(dup3, oldfd, newfd, flags);
1618 int newfd2 = REAL(dup3)(oldfd, newfd, flags);
1619 if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
1620 FdDup(thr, pc, oldfd, newfd2, false);
1621 return newfd2;
1622 }
1623 #endif
1624
1625 #if SANITIZER_LINUX
TSAN_INTERCEPTOR(int,eventfd,unsigned initval,int flags)1626 TSAN_INTERCEPTOR(int, eventfd, unsigned initval, int flags) {
1627 SCOPED_TSAN_INTERCEPTOR(eventfd, initval, flags);
1628 int fd = REAL(eventfd)(initval, flags);
1629 if (fd >= 0)
1630 FdEventCreate(thr, pc, fd);
1631 return fd;
1632 }
1633 #define TSAN_MAYBE_INTERCEPT_EVENTFD TSAN_INTERCEPT(eventfd)
1634 #else
1635 #define TSAN_MAYBE_INTERCEPT_EVENTFD
1636 #endif
1637
1638 #if SANITIZER_LINUX
TSAN_INTERCEPTOR(int,signalfd,int fd,void * mask,int flags)1639 TSAN_INTERCEPTOR(int, signalfd, int fd, void *mask, int flags) {
1640 SCOPED_TSAN_INTERCEPTOR(signalfd, fd, mask, flags);
1641 if (fd >= 0)
1642 FdClose(thr, pc, fd);
1643 fd = REAL(signalfd)(fd, mask, flags);
1644 if (fd >= 0)
1645 FdSignalCreate(thr, pc, fd);
1646 return fd;
1647 }
1648 #define TSAN_MAYBE_INTERCEPT_SIGNALFD TSAN_INTERCEPT(signalfd)
1649 #else
1650 #define TSAN_MAYBE_INTERCEPT_SIGNALFD
1651 #endif
1652
1653 #if SANITIZER_LINUX
TSAN_INTERCEPTOR(int,inotify_init,int fake)1654 TSAN_INTERCEPTOR(int, inotify_init, int fake) {
1655 SCOPED_TSAN_INTERCEPTOR(inotify_init, fake);
1656 int fd = REAL(inotify_init)(fake);
1657 if (fd >= 0)
1658 FdInotifyCreate(thr, pc, fd);
1659 return fd;
1660 }
1661 #define TSAN_MAYBE_INTERCEPT_INOTIFY_INIT TSAN_INTERCEPT(inotify_init)
1662 #else
1663 #define TSAN_MAYBE_INTERCEPT_INOTIFY_INIT
1664 #endif
1665
1666 #if SANITIZER_LINUX
TSAN_INTERCEPTOR(int,inotify_init1,int flags)1667 TSAN_INTERCEPTOR(int, inotify_init1, int flags) {
1668 SCOPED_TSAN_INTERCEPTOR(inotify_init1, flags);
1669 int fd = REAL(inotify_init1)(flags);
1670 if (fd >= 0)
1671 FdInotifyCreate(thr, pc, fd);
1672 return fd;
1673 }
1674 #define TSAN_MAYBE_INTERCEPT_INOTIFY_INIT1 TSAN_INTERCEPT(inotify_init1)
1675 #else
1676 #define TSAN_MAYBE_INTERCEPT_INOTIFY_INIT1
1677 #endif
1678
TSAN_INTERCEPTOR(int,socket,int domain,int type,int protocol)1679 TSAN_INTERCEPTOR(int, socket, int domain, int type, int protocol) {
1680 SCOPED_TSAN_INTERCEPTOR(socket, domain, type, protocol);
1681 int fd = REAL(socket)(domain, type, protocol);
1682 if (fd >= 0)
1683 FdSocketCreate(thr, pc, fd);
1684 return fd;
1685 }
1686
TSAN_INTERCEPTOR(int,socketpair,int domain,int type,int protocol,int * fd)1687 TSAN_INTERCEPTOR(int, socketpair, int domain, int type, int protocol, int *fd) {
1688 SCOPED_TSAN_INTERCEPTOR(socketpair, domain, type, protocol, fd);
1689 int res = REAL(socketpair)(domain, type, protocol, fd);
1690 if (res == 0 && fd[0] >= 0 && fd[1] >= 0)
1691 FdPipeCreate(thr, pc, fd[0], fd[1]);
1692 return res;
1693 }
1694
TSAN_INTERCEPTOR(int,connect,int fd,void * addr,unsigned addrlen)1695 TSAN_INTERCEPTOR(int, connect, int fd, void *addr, unsigned addrlen) {
1696 SCOPED_TSAN_INTERCEPTOR(connect, fd, addr, addrlen);
1697 FdSocketConnecting(thr, pc, fd);
1698 int res = REAL(connect)(fd, addr, addrlen);
1699 if (res == 0 && fd >= 0)
1700 FdSocketConnect(thr, pc, fd);
1701 return res;
1702 }
1703
TSAN_INTERCEPTOR(int,bind,int fd,void * addr,unsigned addrlen)1704 TSAN_INTERCEPTOR(int, bind, int fd, void *addr, unsigned addrlen) {
1705 SCOPED_TSAN_INTERCEPTOR(bind, fd, addr, addrlen);
1706 int res = REAL(bind)(fd, addr, addrlen);
1707 if (fd > 0 && res == 0)
1708 FdAccess(thr, pc, fd);
1709 return res;
1710 }
1711
TSAN_INTERCEPTOR(int,listen,int fd,int backlog)1712 TSAN_INTERCEPTOR(int, listen, int fd, int backlog) {
1713 SCOPED_TSAN_INTERCEPTOR(listen, fd, backlog);
1714 int res = REAL(listen)(fd, backlog);
1715 if (fd > 0 && res == 0)
1716 FdAccess(thr, pc, fd);
1717 return res;
1718 }
1719
TSAN_INTERCEPTOR(int,close,int fd)1720 TSAN_INTERCEPTOR(int, close, int fd) {
1721 SCOPED_TSAN_INTERCEPTOR(close, fd);
1722 if (fd >= 0)
1723 FdClose(thr, pc, fd);
1724 return REAL(close)(fd);
1725 }
1726
1727 #if SANITIZER_LINUX
TSAN_INTERCEPTOR(int,__close,int fd)1728 TSAN_INTERCEPTOR(int, __close, int fd) {
1729 SCOPED_TSAN_INTERCEPTOR(__close, fd);
1730 if (fd >= 0)
1731 FdClose(thr, pc, fd);
1732 return REAL(__close)(fd);
1733 }
1734 #define TSAN_MAYBE_INTERCEPT___CLOSE TSAN_INTERCEPT(__close)
1735 #else
1736 #define TSAN_MAYBE_INTERCEPT___CLOSE
1737 #endif
1738
1739 // glibc guts
1740 #if SANITIZER_LINUX && !SANITIZER_ANDROID
TSAN_INTERCEPTOR(void,__res_iclose,void * state,bool free_addr)1741 TSAN_INTERCEPTOR(void, __res_iclose, void *state, bool free_addr) {
1742 SCOPED_TSAN_INTERCEPTOR(__res_iclose, state, free_addr);
1743 int fds[64];
1744 int cnt = ExtractResolvFDs(state, fds, ARRAY_SIZE(fds));
1745 for (int i = 0; i < cnt; i++) {
1746 if (fds[i] > 0)
1747 FdClose(thr, pc, fds[i]);
1748 }
1749 REAL(__res_iclose)(state, free_addr);
1750 }
1751 #define TSAN_MAYBE_INTERCEPT___RES_ICLOSE TSAN_INTERCEPT(__res_iclose)
1752 #else
1753 #define TSAN_MAYBE_INTERCEPT___RES_ICLOSE
1754 #endif
1755
TSAN_INTERCEPTOR(int,pipe,int * pipefd)1756 TSAN_INTERCEPTOR(int, pipe, int *pipefd) {
1757 SCOPED_TSAN_INTERCEPTOR(pipe, pipefd);
1758 int res = REAL(pipe)(pipefd);
1759 if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
1760 FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
1761 return res;
1762 }
1763
1764 #if !SANITIZER_MAC
TSAN_INTERCEPTOR(int,pipe2,int * pipefd,int flags)1765 TSAN_INTERCEPTOR(int, pipe2, int *pipefd, int flags) {
1766 SCOPED_TSAN_INTERCEPTOR(pipe2, pipefd, flags);
1767 int res = REAL(pipe2)(pipefd, flags);
1768 if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
1769 FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
1770 return res;
1771 }
1772 #endif
1773
TSAN_INTERCEPTOR(int,unlink,char * path)1774 TSAN_INTERCEPTOR(int, unlink, char *path) {
1775 SCOPED_TSAN_INTERCEPTOR(unlink, path);
1776 Release(thr, pc, File2addr(path));
1777 int res = REAL(unlink)(path);
1778 return res;
1779 }
1780
TSAN_INTERCEPTOR(void *,tmpfile,int fake)1781 TSAN_INTERCEPTOR(void*, tmpfile, int fake) {
1782 SCOPED_TSAN_INTERCEPTOR(tmpfile, fake);
1783 void *res = REAL(tmpfile)(fake);
1784 if (res) {
1785 int fd = fileno_unlocked(res);
1786 if (fd >= 0)
1787 FdFileCreate(thr, pc, fd);
1788 }
1789 return res;
1790 }
1791
1792 #if SANITIZER_LINUX
TSAN_INTERCEPTOR(void *,tmpfile64,int fake)1793 TSAN_INTERCEPTOR(void*, tmpfile64, int fake) {
1794 SCOPED_TSAN_INTERCEPTOR(tmpfile64, fake);
1795 void *res = REAL(tmpfile64)(fake);
1796 if (res) {
1797 int fd = fileno_unlocked(res);
1798 if (fd >= 0)
1799 FdFileCreate(thr, pc, fd);
1800 }
1801 return res;
1802 }
1803 #define TSAN_MAYBE_INTERCEPT_TMPFILE64 TSAN_INTERCEPT(tmpfile64)
1804 #else
1805 #define TSAN_MAYBE_INTERCEPT_TMPFILE64
1806 #endif
1807
FlushStreams()1808 static void FlushStreams() {
1809 // Flushing all the streams here may freeze the process if a child thread is
1810 // performing file stream operations at the same time.
1811 REAL(fflush)(stdout);
1812 REAL(fflush)(stderr);
1813 }
1814
TSAN_INTERCEPTOR(void,abort,int fake)1815 TSAN_INTERCEPTOR(void, abort, int fake) {
1816 SCOPED_TSAN_INTERCEPTOR(abort, fake);
1817 FlushStreams();
1818 REAL(abort)(fake);
1819 }
1820
TSAN_INTERCEPTOR(int,rmdir,char * path)1821 TSAN_INTERCEPTOR(int, rmdir, char *path) {
1822 SCOPED_TSAN_INTERCEPTOR(rmdir, path);
1823 Release(thr, pc, Dir2addr(path));
1824 int res = REAL(rmdir)(path);
1825 return res;
1826 }
1827
TSAN_INTERCEPTOR(int,closedir,void * dirp)1828 TSAN_INTERCEPTOR(int, closedir, void *dirp) {
1829 SCOPED_TSAN_INTERCEPTOR(closedir, dirp);
1830 if (dirp) {
1831 int fd = dirfd(dirp);
1832 FdClose(thr, pc, fd);
1833 }
1834 return REAL(closedir)(dirp);
1835 }
1836
1837 #if SANITIZER_LINUX
TSAN_INTERCEPTOR(int,epoll_create,int size)1838 TSAN_INTERCEPTOR(int, epoll_create, int size) {
1839 SCOPED_TSAN_INTERCEPTOR(epoll_create, size);
1840 int fd = REAL(epoll_create)(size);
1841 if (fd >= 0)
1842 FdPollCreate(thr, pc, fd);
1843 return fd;
1844 }
1845
TSAN_INTERCEPTOR(int,epoll_create1,int flags)1846 TSAN_INTERCEPTOR(int, epoll_create1, int flags) {
1847 SCOPED_TSAN_INTERCEPTOR(epoll_create1, flags);
1848 int fd = REAL(epoll_create1)(flags);
1849 if (fd >= 0)
1850 FdPollCreate(thr, pc, fd);
1851 return fd;
1852 }
1853
TSAN_INTERCEPTOR(int,epoll_ctl,int epfd,int op,int fd,void * ev)1854 TSAN_INTERCEPTOR(int, epoll_ctl, int epfd, int op, int fd, void *ev) {
1855 SCOPED_TSAN_INTERCEPTOR(epoll_ctl, epfd, op, fd, ev);
1856 if (epfd >= 0)
1857 FdAccess(thr, pc, epfd);
1858 if (epfd >= 0 && fd >= 0)
1859 FdAccess(thr, pc, fd);
1860 if (op == EPOLL_CTL_ADD && epfd >= 0)
1861 FdRelease(thr, pc, epfd);
1862 int res = REAL(epoll_ctl)(epfd, op, fd, ev);
1863 return res;
1864 }
1865
TSAN_INTERCEPTOR(int,epoll_wait,int epfd,void * ev,int cnt,int timeout)1866 TSAN_INTERCEPTOR(int, epoll_wait, int epfd, void *ev, int cnt, int timeout) {
1867 SCOPED_TSAN_INTERCEPTOR(epoll_wait, epfd, ev, cnt, timeout);
1868 if (epfd >= 0)
1869 FdAccess(thr, pc, epfd);
1870 int res = BLOCK_REAL(epoll_wait)(epfd, ev, cnt, timeout);
1871 if (res > 0 && epfd >= 0)
1872 FdAcquire(thr, pc, epfd);
1873 return res;
1874 }
1875
TSAN_INTERCEPTOR(int,epoll_pwait,int epfd,void * ev,int cnt,int timeout,void * sigmask)1876 TSAN_INTERCEPTOR(int, epoll_pwait, int epfd, void *ev, int cnt, int timeout,
1877 void *sigmask) {
1878 SCOPED_TSAN_INTERCEPTOR(epoll_pwait, epfd, ev, cnt, timeout, sigmask);
1879 if (epfd >= 0)
1880 FdAccess(thr, pc, epfd);
1881 int res = BLOCK_REAL(epoll_pwait)(epfd, ev, cnt, timeout, sigmask);
1882 if (res > 0 && epfd >= 0)
1883 FdAcquire(thr, pc, epfd);
1884 return res;
1885 }
1886
1887 #define TSAN_MAYBE_INTERCEPT_EPOLL \
1888 TSAN_INTERCEPT(epoll_create); \
1889 TSAN_INTERCEPT(epoll_create1); \
1890 TSAN_INTERCEPT(epoll_ctl); \
1891 TSAN_INTERCEPT(epoll_wait); \
1892 TSAN_INTERCEPT(epoll_pwait)
1893 #else
1894 #define TSAN_MAYBE_INTERCEPT_EPOLL
1895 #endif
1896
1897 // The following functions are intercepted merely to process pending signals.
1898 // If program blocks signal X, we must deliver the signal before the function
1899 // returns. Similarly, if program unblocks a signal (or returns from sigsuspend)
1900 // it's better to deliver the signal straight away.
TSAN_INTERCEPTOR(int,sigsuspend,const __sanitizer_sigset_t * mask)1901 TSAN_INTERCEPTOR(int, sigsuspend, const __sanitizer_sigset_t *mask) {
1902 SCOPED_TSAN_INTERCEPTOR(sigsuspend, mask);
1903 return REAL(sigsuspend)(mask);
1904 }
1905
TSAN_INTERCEPTOR(int,sigblock,int mask)1906 TSAN_INTERCEPTOR(int, sigblock, int mask) {
1907 SCOPED_TSAN_INTERCEPTOR(sigblock, mask);
1908 return REAL(sigblock)(mask);
1909 }
1910
TSAN_INTERCEPTOR(int,sigsetmask,int mask)1911 TSAN_INTERCEPTOR(int, sigsetmask, int mask) {
1912 SCOPED_TSAN_INTERCEPTOR(sigsetmask, mask);
1913 return REAL(sigsetmask)(mask);
1914 }
1915
TSAN_INTERCEPTOR(int,pthread_sigmask,int how,const __sanitizer_sigset_t * set,__sanitizer_sigset_t * oldset)1916 TSAN_INTERCEPTOR(int, pthread_sigmask, int how, const __sanitizer_sigset_t *set,
1917 __sanitizer_sigset_t *oldset) {
1918 SCOPED_TSAN_INTERCEPTOR(pthread_sigmask, how, set, oldset);
1919 return REAL(pthread_sigmask)(how, set, oldset);
1920 }
1921
1922 namespace __tsan {
1923
CallUserSignalHandler(ThreadState * thr,bool sync,bool acquire,bool sigact,int sig,__sanitizer_siginfo * info,void * uctx)1924 static void CallUserSignalHandler(ThreadState *thr, bool sync, bool acquire,
1925 bool sigact, int sig,
1926 __sanitizer_siginfo *info, void *uctx) {
1927 __sanitizer_sigaction *sigactions = interceptor_ctx()->sigactions;
1928 if (acquire)
1929 Acquire(thr, 0, (uptr)&sigactions[sig]);
1930 // Signals are generally asynchronous, so if we receive a signals when
1931 // ignores are enabled we should disable ignores. This is critical for sync
1932 // and interceptors, because otherwise we can miss syncronization and report
1933 // false races.
1934 int ignore_reads_and_writes = thr->ignore_reads_and_writes;
1935 int ignore_interceptors = thr->ignore_interceptors;
1936 int ignore_sync = thr->ignore_sync;
1937 if (!ctx->after_multithreaded_fork) {
1938 thr->ignore_reads_and_writes = 0;
1939 thr->fast_state.ClearIgnoreBit();
1940 thr->ignore_interceptors = 0;
1941 thr->ignore_sync = 0;
1942 }
1943 // Ensure that the handler does not spoil errno.
1944 const int saved_errno = errno;
1945 errno = 99;
1946 // This code races with sigaction. Be careful to not read sa_sigaction twice.
1947 // Also need to remember pc for reporting before the call,
1948 // because the handler can reset it.
1949 volatile uptr pc =
1950 sigact ? (uptr)sigactions[sig].sigaction : (uptr)sigactions[sig].handler;
1951 if (pc != sig_dfl && pc != sig_ign) {
1952 if (sigact)
1953 ((__sanitizer_sigactionhandler_ptr)pc)(sig, info, uctx);
1954 else
1955 ((__sanitizer_sighandler_ptr)pc)(sig);
1956 }
1957 if (!ctx->after_multithreaded_fork) {
1958 thr->ignore_reads_and_writes = ignore_reads_and_writes;
1959 if (ignore_reads_and_writes)
1960 thr->fast_state.SetIgnoreBit();
1961 thr->ignore_interceptors = ignore_interceptors;
1962 thr->ignore_sync = ignore_sync;
1963 }
1964 // We do not detect errno spoiling for SIGTERM,
1965 // because some SIGTERM handlers do spoil errno but reraise SIGTERM,
1966 // tsan reports false positive in such case.
1967 // It's difficult to properly detect this situation (reraise),
1968 // because in async signal processing case (when handler is called directly
1969 // from rtl_generic_sighandler) we have not yet received the reraised
1970 // signal; and it looks too fragile to intercept all ways to reraise a signal.
1971 if (flags()->report_bugs && !sync && sig != SIGTERM && errno != 99) {
1972 VarSizeStackTrace stack;
1973 // StackTrace::GetNestInstructionPc(pc) is used because return address is
1974 // expected, OutputReport() will undo this.
1975 ObtainCurrentStack(thr, StackTrace::GetNextInstructionPc(pc), &stack);
1976 ThreadRegistryLock l(ctx->thread_registry);
1977 ScopedReport rep(ReportTypeErrnoInSignal);
1978 if (!IsFiredSuppression(ctx, ReportTypeErrnoInSignal, stack)) {
1979 rep.AddStack(stack, true);
1980 OutputReport(thr, rep);
1981 }
1982 }
1983 errno = saved_errno;
1984 }
1985
ProcessPendingSignals(ThreadState * thr)1986 void ProcessPendingSignals(ThreadState *thr) {
1987 ThreadSignalContext *sctx = SigCtx(thr);
1988 if (sctx == 0 ||
1989 atomic_load(&sctx->have_pending_signals, memory_order_relaxed) == 0)
1990 return;
1991 atomic_store(&sctx->have_pending_signals, 0, memory_order_relaxed);
1992 atomic_fetch_add(&thr->in_signal_handler, 1, memory_order_relaxed);
1993 internal_sigfillset(&sctx->emptyset);
1994 int res = REAL(pthread_sigmask)(SIG_SETMASK, &sctx->emptyset, &sctx->oldset);
1995 CHECK_EQ(res, 0);
1996 for (int sig = 0; sig < kSigCount; sig++) {
1997 SignalDesc *signal = &sctx->pending_signals[sig];
1998 if (signal->armed) {
1999 signal->armed = false;
2000 CallUserSignalHandler(thr, false, true, signal->sigaction, sig,
2001 &signal->siginfo, &signal->ctx);
2002 }
2003 }
2004 res = REAL(pthread_sigmask)(SIG_SETMASK, &sctx->oldset, 0);
2005 CHECK_EQ(res, 0);
2006 atomic_fetch_add(&thr->in_signal_handler, -1, memory_order_relaxed);
2007 }
2008
2009 } // namespace __tsan
2010
is_sync_signal(ThreadSignalContext * sctx,int sig)2011 static bool is_sync_signal(ThreadSignalContext *sctx, int sig) {
2012 return sig == SIGSEGV || sig == SIGBUS || sig == SIGILL || sig == SIGTRAP ||
2013 sig == SIGABRT || sig == SIGFPE || sig == SIGPIPE || sig == SIGSYS ||
2014 // If we are sending signal to ourselves, we must process it now.
2015 (sctx && sig == sctx->int_signal_send);
2016 }
2017
rtl_generic_sighandler(bool sigact,int sig,__sanitizer_siginfo * info,void * ctx)2018 void ALWAYS_INLINE rtl_generic_sighandler(bool sigact, int sig,
2019 __sanitizer_siginfo *info,
2020 void *ctx) {
2021 cur_thread_init();
2022 ThreadState *thr = cur_thread();
2023 ThreadSignalContext *sctx = SigCtx(thr);
2024 if (sig < 0 || sig >= kSigCount) {
2025 VPrintf(1, "ThreadSanitizer: ignoring signal %d\n", sig);
2026 return;
2027 }
2028 // Don't mess with synchronous signals.
2029 const bool sync = is_sync_signal(sctx, sig);
2030 if (sync ||
2031 // If we are in blocking function, we can safely process it now
2032 // (but check if we are in a recursive interceptor,
2033 // i.e. pthread_join()->munmap()).
2034 (sctx && atomic_load(&sctx->in_blocking_func, memory_order_relaxed))) {
2035 atomic_fetch_add(&thr->in_signal_handler, 1, memory_order_relaxed);
2036 if (sctx && atomic_load(&sctx->in_blocking_func, memory_order_relaxed)) {
2037 atomic_store(&sctx->in_blocking_func, 0, memory_order_relaxed);
2038 CallUserSignalHandler(thr, sync, true, sigact, sig, info, ctx);
2039 atomic_store(&sctx->in_blocking_func, 1, memory_order_relaxed);
2040 } else {
2041 // Be very conservative with when we do acquire in this case.
2042 // It's unsafe to do acquire in async handlers, because ThreadState
2043 // can be in inconsistent state.
2044 // SIGSYS looks relatively safe -- it's synchronous and can actually
2045 // need some global state.
2046 bool acq = (sig == SIGSYS);
2047 CallUserSignalHandler(thr, sync, acq, sigact, sig, info, ctx);
2048 }
2049 atomic_fetch_add(&thr->in_signal_handler, -1, memory_order_relaxed);
2050 return;
2051 }
2052
2053 if (sctx == 0)
2054 return;
2055 SignalDesc *signal = &sctx->pending_signals[sig];
2056 if (signal->armed == false) {
2057 signal->armed = true;
2058 signal->sigaction = sigact;
2059 if (info)
2060 internal_memcpy(&signal->siginfo, info, sizeof(*info));
2061 if (ctx)
2062 internal_memcpy(&signal->ctx, ctx, sizeof(signal->ctx));
2063 atomic_store(&sctx->have_pending_signals, 1, memory_order_relaxed);
2064 }
2065 }
2066
rtl_sighandler(int sig)2067 static void rtl_sighandler(int sig) {
2068 rtl_generic_sighandler(false, sig, 0, 0);
2069 }
2070
rtl_sigaction(int sig,__sanitizer_siginfo * info,void * ctx)2071 static void rtl_sigaction(int sig, __sanitizer_siginfo *info, void *ctx) {
2072 rtl_generic_sighandler(true, sig, info, ctx);
2073 }
2074
TSAN_INTERCEPTOR(int,raise,int sig)2075 TSAN_INTERCEPTOR(int, raise, int sig) {
2076 SCOPED_TSAN_INTERCEPTOR(raise, sig);
2077 ThreadSignalContext *sctx = SigCtx(thr);
2078 CHECK_NE(sctx, 0);
2079 int prev = sctx->int_signal_send;
2080 sctx->int_signal_send = sig;
2081 int res = REAL(raise)(sig);
2082 CHECK_EQ(sctx->int_signal_send, sig);
2083 sctx->int_signal_send = prev;
2084 return res;
2085 }
2086
TSAN_INTERCEPTOR(int,kill,int pid,int sig)2087 TSAN_INTERCEPTOR(int, kill, int pid, int sig) {
2088 SCOPED_TSAN_INTERCEPTOR(kill, pid, sig);
2089 ThreadSignalContext *sctx = SigCtx(thr);
2090 CHECK_NE(sctx, 0);
2091 int prev = sctx->int_signal_send;
2092 if (pid == (int)internal_getpid()) {
2093 sctx->int_signal_send = sig;
2094 }
2095 int res = REAL(kill)(pid, sig);
2096 if (pid == (int)internal_getpid()) {
2097 CHECK_EQ(sctx->int_signal_send, sig);
2098 sctx->int_signal_send = prev;
2099 }
2100 return res;
2101 }
2102
TSAN_INTERCEPTOR(int,pthread_kill,void * tid,int sig)2103 TSAN_INTERCEPTOR(int, pthread_kill, void *tid, int sig) {
2104 SCOPED_TSAN_INTERCEPTOR(pthread_kill, tid, sig);
2105 ThreadSignalContext *sctx = SigCtx(thr);
2106 CHECK_NE(sctx, 0);
2107 int prev = sctx->int_signal_send;
2108 if (tid == pthread_self()) {
2109 sctx->int_signal_send = sig;
2110 }
2111 int res = REAL(pthread_kill)(tid, sig);
2112 if (tid == pthread_self()) {
2113 CHECK_EQ(sctx->int_signal_send, sig);
2114 sctx->int_signal_send = prev;
2115 }
2116 return res;
2117 }
2118
TSAN_INTERCEPTOR(int,gettimeofday,void * tv,void * tz)2119 TSAN_INTERCEPTOR(int, gettimeofday, void *tv, void *tz) {
2120 SCOPED_TSAN_INTERCEPTOR(gettimeofday, tv, tz);
2121 // It's intercepted merely to process pending signals.
2122 return REAL(gettimeofday)(tv, tz);
2123 }
2124
TSAN_INTERCEPTOR(int,getaddrinfo,void * node,void * service,void * hints,void * rv)2125 TSAN_INTERCEPTOR(int, getaddrinfo, void *node, void *service,
2126 void *hints, void *rv) {
2127 SCOPED_TSAN_INTERCEPTOR(getaddrinfo, node, service, hints, rv);
2128 // We miss atomic synchronization in getaddrinfo,
2129 // and can report false race between malloc and free
2130 // inside of getaddrinfo. So ignore memory accesses.
2131 ThreadIgnoreBegin(thr, pc);
2132 int res = REAL(getaddrinfo)(node, service, hints, rv);
2133 ThreadIgnoreEnd(thr, pc);
2134 return res;
2135 }
2136
TSAN_INTERCEPTOR(int,fork,int fake)2137 TSAN_INTERCEPTOR(int, fork, int fake) {
2138 if (in_symbolizer())
2139 return REAL(fork)(fake);
2140 SCOPED_INTERCEPTOR_RAW(fork, fake);
2141 ForkBefore(thr, pc);
2142 int pid;
2143 {
2144 // On OS X, REAL(fork) can call intercepted functions (OSSpinLockLock), and
2145 // we'll assert in CheckNoLocks() unless we ignore interceptors.
2146 ScopedIgnoreInterceptors ignore;
2147 pid = REAL(fork)(fake);
2148 }
2149 if (pid == 0) {
2150 // child
2151 ForkChildAfter(thr, pc);
2152 FdOnFork(thr, pc);
2153 } else if (pid > 0) {
2154 // parent
2155 ForkParentAfter(thr, pc);
2156 } else {
2157 // error
2158 ForkParentAfter(thr, pc);
2159 }
2160 return pid;
2161 }
2162
TSAN_INTERCEPTOR(int,vfork,int fake)2163 TSAN_INTERCEPTOR(int, vfork, int fake) {
2164 // Some programs (e.g. openjdk) call close for all file descriptors
2165 // in the child process. Under tsan it leads to false positives, because
2166 // address space is shared, so the parent process also thinks that
2167 // the descriptors are closed (while they are actually not).
2168 // This leads to false positives due to missed synchronization.
2169 // Strictly saying this is undefined behavior, because vfork child is not
2170 // allowed to call any functions other than exec/exit. But this is what
2171 // openjdk does, so we want to handle it.
2172 // We could disable interceptors in the child process. But it's not possible
2173 // to simply intercept and wrap vfork, because vfork child is not allowed
2174 // to return from the function that calls vfork, and that's exactly what
2175 // we would do. So this would require some assembly trickery as well.
2176 // Instead we simply turn vfork into fork.
2177 return WRAP(fork)(fake);
2178 }
2179
2180 #if !SANITIZER_MAC && !SANITIZER_ANDROID
2181 typedef int (*dl_iterate_phdr_cb_t)(__sanitizer_dl_phdr_info *info, SIZE_T size,
2182 void *data);
2183 struct dl_iterate_phdr_data {
2184 ThreadState *thr;
2185 uptr pc;
2186 dl_iterate_phdr_cb_t cb;
2187 void *data;
2188 };
2189
IsAppNotRodata(uptr addr)2190 static bool IsAppNotRodata(uptr addr) {
2191 return IsAppMem(addr) && *(u64*)MemToShadow(addr) != kShadowRodata;
2192 }
2193
dl_iterate_phdr_cb(__sanitizer_dl_phdr_info * info,SIZE_T size,void * data)2194 static int dl_iterate_phdr_cb(__sanitizer_dl_phdr_info *info, SIZE_T size,
2195 void *data) {
2196 dl_iterate_phdr_data *cbdata = (dl_iterate_phdr_data *)data;
2197 // dlopen/dlclose allocate/free dynamic-linker-internal memory, which is later
2198 // accessible in dl_iterate_phdr callback. But we don't see synchronization
2199 // inside of dynamic linker, so we "unpoison" it here in order to not
2200 // produce false reports. Ignoring malloc/free in dlopen/dlclose is not enough
2201 // because some libc functions call __libc_dlopen.
2202 if (info && IsAppNotRodata((uptr)info->dlpi_name))
2203 MemoryResetRange(cbdata->thr, cbdata->pc, (uptr)info->dlpi_name,
2204 internal_strlen(info->dlpi_name));
2205 int res = cbdata->cb(info, size, cbdata->data);
2206 // Perform the check one more time in case info->dlpi_name was overwritten
2207 // by user callback.
2208 if (info && IsAppNotRodata((uptr)info->dlpi_name))
2209 MemoryResetRange(cbdata->thr, cbdata->pc, (uptr)info->dlpi_name,
2210 internal_strlen(info->dlpi_name));
2211 return res;
2212 }
2213
TSAN_INTERCEPTOR(int,dl_iterate_phdr,dl_iterate_phdr_cb_t cb,void * data)2214 TSAN_INTERCEPTOR(int, dl_iterate_phdr, dl_iterate_phdr_cb_t cb, void *data) {
2215 SCOPED_TSAN_INTERCEPTOR(dl_iterate_phdr, cb, data);
2216 dl_iterate_phdr_data cbdata;
2217 cbdata.thr = thr;
2218 cbdata.pc = pc;
2219 cbdata.cb = cb;
2220 cbdata.data = data;
2221 int res = REAL(dl_iterate_phdr)(dl_iterate_phdr_cb, &cbdata);
2222 return res;
2223 }
2224 #endif
2225
OnExit(ThreadState * thr)2226 static int OnExit(ThreadState *thr) {
2227 int status = Finalize(thr);
2228 FlushStreams();
2229 return status;
2230 }
2231
2232 struct TsanInterceptorContext {
2233 ThreadState *thr;
2234 const uptr caller_pc;
2235 const uptr pc;
2236 };
2237
2238 #if !SANITIZER_MAC
HandleRecvmsg(ThreadState * thr,uptr pc,__sanitizer_msghdr * msg)2239 static void HandleRecvmsg(ThreadState *thr, uptr pc,
2240 __sanitizer_msghdr *msg) {
2241 int fds[64];
2242 int cnt = ExtractRecvmsgFDs(msg, fds, ARRAY_SIZE(fds));
2243 for (int i = 0; i < cnt; i++)
2244 FdEventCreate(thr, pc, fds[i]);
2245 }
2246 #endif
2247
2248 #include "sanitizer_common/sanitizer_platform_interceptors.h"
2249 // Causes interceptor recursion (getaddrinfo() and fopen())
2250 #undef SANITIZER_INTERCEPT_GETADDRINFO
2251 // We define our own.
2252 #if SANITIZER_INTERCEPT_TLS_GET_ADDR
2253 #define NEED_TLS_GET_ADDR
2254 #endif
2255 #undef SANITIZER_INTERCEPT_TLS_GET_ADDR
2256 #undef SANITIZER_INTERCEPT_PTHREAD_SIGMASK
2257
2258 #define COMMON_INTERCEPT_FUNCTION(name) INTERCEPT_FUNCTION(name)
2259 #define COMMON_INTERCEPT_FUNCTION_VER(name, ver) \
2260 INTERCEPT_FUNCTION_VER(name, ver)
2261
2262 #define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size) \
2263 MemoryAccessRange(((TsanInterceptorContext *)ctx)->thr, \
2264 ((TsanInterceptorContext *)ctx)->pc, (uptr)ptr, size, \
2265 true)
2266
2267 #define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size) \
2268 MemoryAccessRange(((TsanInterceptorContext *) ctx)->thr, \
2269 ((TsanInterceptorContext *) ctx)->pc, (uptr) ptr, size, \
2270 false)
2271
2272 #define COMMON_INTERCEPTOR_ENTER(ctx, func, ...) \
2273 SCOPED_TSAN_INTERCEPTOR(func, __VA_ARGS__); \
2274 TsanInterceptorContext _ctx = {thr, caller_pc, pc}; \
2275 ctx = (void *)&_ctx; \
2276 (void) ctx;
2277
2278 #define COMMON_INTERCEPTOR_ENTER_NOIGNORE(ctx, func, ...) \
2279 SCOPED_INTERCEPTOR_RAW(func, __VA_ARGS__); \
2280 TsanInterceptorContext _ctx = {thr, caller_pc, pc}; \
2281 ctx = (void *)&_ctx; \
2282 (void) ctx;
2283
2284 #define COMMON_INTERCEPTOR_FILE_OPEN(ctx, file, path) \
2285 if (path) \
2286 Acquire(thr, pc, File2addr(path)); \
2287 if (file) { \
2288 int fd = fileno_unlocked(file); \
2289 if (fd >= 0) FdFileCreate(thr, pc, fd); \
2290 }
2291
2292 #define COMMON_INTERCEPTOR_FILE_CLOSE(ctx, file) \
2293 if (file) { \
2294 int fd = fileno_unlocked(file); \
2295 if (fd >= 0) FdClose(thr, pc, fd); \
2296 }
2297
2298 #define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, handle) \
2299 libignore()->OnLibraryLoaded(filename)
2300
2301 #define COMMON_INTERCEPTOR_LIBRARY_UNLOADED() \
2302 libignore()->OnLibraryUnloaded()
2303
2304 #define COMMON_INTERCEPTOR_ACQUIRE(ctx, u) \
2305 Acquire(((TsanInterceptorContext *) ctx)->thr, pc, u)
2306
2307 #define COMMON_INTERCEPTOR_RELEASE(ctx, u) \
2308 Release(((TsanInterceptorContext *) ctx)->thr, pc, u)
2309
2310 #define COMMON_INTERCEPTOR_DIR_ACQUIRE(ctx, path) \
2311 Acquire(((TsanInterceptorContext *) ctx)->thr, pc, Dir2addr(path))
2312
2313 #define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \
2314 FdAcquire(((TsanInterceptorContext *) ctx)->thr, pc, fd)
2315
2316 #define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \
2317 FdRelease(((TsanInterceptorContext *) ctx)->thr, pc, fd)
2318
2319 #define COMMON_INTERCEPTOR_FD_ACCESS(ctx, fd) \
2320 FdAccess(((TsanInterceptorContext *) ctx)->thr, pc, fd)
2321
2322 #define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd) \
2323 FdSocketAccept(((TsanInterceptorContext *) ctx)->thr, pc, fd, newfd)
2324
2325 #define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) \
2326 ThreadSetName(((TsanInterceptorContext *) ctx)->thr, name)
2327
2328 #define COMMON_INTERCEPTOR_SET_PTHREAD_NAME(ctx, thread, name) \
2329 __tsan::ctx->thread_registry->SetThreadNameByUserId(thread, name)
2330
2331 #define COMMON_INTERCEPTOR_BLOCK_REAL(name) BLOCK_REAL(name)
2332
2333 #define COMMON_INTERCEPTOR_ON_EXIT(ctx) \
2334 OnExit(((TsanInterceptorContext *) ctx)->thr)
2335
2336 #define COMMON_INTERCEPTOR_MUTEX_PRE_LOCK(ctx, m) \
2337 MutexPreLock(((TsanInterceptorContext *)ctx)->thr, \
2338 ((TsanInterceptorContext *)ctx)->pc, (uptr)m)
2339
2340 #define COMMON_INTERCEPTOR_MUTEX_POST_LOCK(ctx, m) \
2341 MutexPostLock(((TsanInterceptorContext *)ctx)->thr, \
2342 ((TsanInterceptorContext *)ctx)->pc, (uptr)m)
2343
2344 #define COMMON_INTERCEPTOR_MUTEX_UNLOCK(ctx, m) \
2345 MutexUnlock(((TsanInterceptorContext *)ctx)->thr, \
2346 ((TsanInterceptorContext *)ctx)->pc, (uptr)m)
2347
2348 #define COMMON_INTERCEPTOR_MUTEX_REPAIR(ctx, m) \
2349 MutexRepair(((TsanInterceptorContext *)ctx)->thr, \
2350 ((TsanInterceptorContext *)ctx)->pc, (uptr)m)
2351
2352 #define COMMON_INTERCEPTOR_MUTEX_INVALID(ctx, m) \
2353 MutexInvalidAccess(((TsanInterceptorContext *)ctx)->thr, \
2354 ((TsanInterceptorContext *)ctx)->pc, (uptr)m)
2355
2356 #define COMMON_INTERCEPTOR_MMAP_IMPL(ctx, mmap, addr, sz, prot, flags, fd, \
2357 off) \
2358 do { \
2359 return mmap_interceptor(thr, pc, REAL(mmap), addr, sz, prot, flags, fd, \
2360 off); \
2361 } while (false)
2362
2363 #if !SANITIZER_MAC
2364 #define COMMON_INTERCEPTOR_HANDLE_RECVMSG(ctx, msg) \
2365 HandleRecvmsg(((TsanInterceptorContext *)ctx)->thr, \
2366 ((TsanInterceptorContext *)ctx)->pc, msg)
2367 #endif
2368
2369 #define COMMON_INTERCEPTOR_GET_TLS_RANGE(begin, end) \
2370 if (TsanThread *t = GetCurrentThread()) { \
2371 *begin = t->tls_begin(); \
2372 *end = t->tls_end(); \
2373 } else { \
2374 *begin = *end = 0; \
2375 }
2376
2377 #define COMMON_INTERCEPTOR_USER_CALLBACK_START() \
2378 SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_START()
2379
2380 #define COMMON_INTERCEPTOR_USER_CALLBACK_END() \
2381 SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_END()
2382
2383 #include "sanitizer_common/sanitizer_common_interceptors.inc"
2384
2385 static int sigaction_impl(int sig, const __sanitizer_sigaction *act,
2386 __sanitizer_sigaction *old);
2387 static __sanitizer_sighandler_ptr signal_impl(int sig,
2388 __sanitizer_sighandler_ptr h);
2389
2390 #define SIGNAL_INTERCEPTOR_SIGACTION_IMPL(signo, act, oldact) \
2391 { return sigaction_impl(signo, act, oldact); }
2392
2393 #define SIGNAL_INTERCEPTOR_SIGNAL_IMPL(func, signo, handler) \
2394 { return (uptr)signal_impl(signo, (__sanitizer_sighandler_ptr)handler); }
2395
2396 #include "sanitizer_common/sanitizer_signal_interceptors.inc"
2397
sigaction_impl(int sig,const __sanitizer_sigaction * act,__sanitizer_sigaction * old)2398 int sigaction_impl(int sig, const __sanitizer_sigaction *act,
2399 __sanitizer_sigaction *old) {
2400 // Note: if we call REAL(sigaction) directly for any reason without proxying
2401 // the signal handler through rtl_sigaction, very bad things will happen.
2402 // The handler will run synchronously and corrupt tsan per-thread state.
2403 SCOPED_INTERCEPTOR_RAW(sigaction, sig, act, old);
2404 __sanitizer_sigaction *sigactions = interceptor_ctx()->sigactions;
2405 __sanitizer_sigaction old_stored;
2406 if (old) internal_memcpy(&old_stored, &sigactions[sig], sizeof(old_stored));
2407 __sanitizer_sigaction newact;
2408 if (act) {
2409 // Copy act into sigactions[sig].
2410 // Can't use struct copy, because compiler can emit call to memcpy.
2411 // Can't use internal_memcpy, because it copies byte-by-byte,
2412 // and signal handler reads the handler concurrently. It it can read
2413 // some bytes from old value and some bytes from new value.
2414 // Use volatile to prevent insertion of memcpy.
2415 sigactions[sig].handler =
2416 *(volatile __sanitizer_sighandler_ptr const *)&act->handler;
2417 sigactions[sig].sa_flags = *(volatile int const *)&act->sa_flags;
2418 internal_memcpy(&sigactions[sig].sa_mask, &act->sa_mask,
2419 sizeof(sigactions[sig].sa_mask));
2420 #if !SANITIZER_FREEBSD && !SANITIZER_MAC && !SANITIZER_NETBSD
2421 sigactions[sig].sa_restorer = act->sa_restorer;
2422 #endif
2423 internal_memcpy(&newact, act, sizeof(newact));
2424 internal_sigfillset(&newact.sa_mask);
2425 if ((uptr)act->handler != sig_ign && (uptr)act->handler != sig_dfl) {
2426 if (newact.sa_flags & SA_SIGINFO)
2427 newact.sigaction = rtl_sigaction;
2428 else
2429 newact.handler = rtl_sighandler;
2430 }
2431 ReleaseStore(thr, pc, (uptr)&sigactions[sig]);
2432 act = &newact;
2433 }
2434 int res = REAL(sigaction)(sig, act, old);
2435 if (res == 0 && old) {
2436 uptr cb = (uptr)old->sigaction;
2437 if (cb == (uptr)rtl_sigaction || cb == (uptr)rtl_sighandler) {
2438 internal_memcpy(old, &old_stored, sizeof(*old));
2439 }
2440 }
2441 return res;
2442 }
2443
signal_impl(int sig,__sanitizer_sighandler_ptr h)2444 static __sanitizer_sighandler_ptr signal_impl(int sig,
2445 __sanitizer_sighandler_ptr h) {
2446 __sanitizer_sigaction act;
2447 act.handler = h;
2448 internal_memset(&act.sa_mask, -1, sizeof(act.sa_mask));
2449 act.sa_flags = 0;
2450 __sanitizer_sigaction old;
2451 int res = sigaction_symname(sig, &act, &old);
2452 if (res) return (__sanitizer_sighandler_ptr)sig_err;
2453 return old.handler;
2454 }
2455
2456 #define TSAN_SYSCALL() \
2457 ThreadState *thr = cur_thread(); \
2458 if (thr->ignore_interceptors) \
2459 return; \
2460 ScopedSyscall scoped_syscall(thr) \
2461 /**/
2462
2463 struct ScopedSyscall {
2464 ThreadState *thr;
2465
ScopedSyscallScopedSyscall2466 explicit ScopedSyscall(ThreadState *thr)
2467 : thr(thr) {
2468 Initialize(thr);
2469 }
2470
~ScopedSyscallScopedSyscall2471 ~ScopedSyscall() {
2472 ProcessPendingSignals(thr);
2473 }
2474 };
2475
2476 #if !SANITIZER_FREEBSD && !SANITIZER_MAC
syscall_access_range(uptr pc,uptr p,uptr s,bool write)2477 static void syscall_access_range(uptr pc, uptr p, uptr s, bool write) {
2478 TSAN_SYSCALL();
2479 MemoryAccessRange(thr, pc, p, s, write);
2480 }
2481
syscall_acquire(uptr pc,uptr addr)2482 static USED void syscall_acquire(uptr pc, uptr addr) {
2483 TSAN_SYSCALL();
2484 Acquire(thr, pc, addr);
2485 DPrintf("syscall_acquire(%p)\n", addr);
2486 }
2487
syscall_release(uptr pc,uptr addr)2488 static USED void syscall_release(uptr pc, uptr addr) {
2489 TSAN_SYSCALL();
2490 DPrintf("syscall_release(%p)\n", addr);
2491 Release(thr, pc, addr);
2492 }
2493
syscall_fd_close(uptr pc,int fd)2494 static void syscall_fd_close(uptr pc, int fd) {
2495 TSAN_SYSCALL();
2496 FdClose(thr, pc, fd);
2497 }
2498
syscall_fd_acquire(uptr pc,int fd)2499 static USED void syscall_fd_acquire(uptr pc, int fd) {
2500 TSAN_SYSCALL();
2501 FdAcquire(thr, pc, fd);
2502 DPrintf("syscall_fd_acquire(%p)\n", fd);
2503 }
2504
syscall_fd_release(uptr pc,int fd)2505 static USED void syscall_fd_release(uptr pc, int fd) {
2506 TSAN_SYSCALL();
2507 DPrintf("syscall_fd_release(%p)\n", fd);
2508 FdRelease(thr, pc, fd);
2509 }
2510
syscall_pre_fork(uptr pc)2511 static void syscall_pre_fork(uptr pc) {
2512 TSAN_SYSCALL();
2513 ForkBefore(thr, pc);
2514 }
2515
syscall_post_fork(uptr pc,int pid)2516 static void syscall_post_fork(uptr pc, int pid) {
2517 TSAN_SYSCALL();
2518 if (pid == 0) {
2519 // child
2520 ForkChildAfter(thr, pc);
2521 FdOnFork(thr, pc);
2522 } else if (pid > 0) {
2523 // parent
2524 ForkParentAfter(thr, pc);
2525 } else {
2526 // error
2527 ForkParentAfter(thr, pc);
2528 }
2529 }
2530 #endif
2531
2532 #define COMMON_SYSCALL_PRE_READ_RANGE(p, s) \
2533 syscall_access_range(GET_CALLER_PC(), (uptr)(p), (uptr)(s), false)
2534
2535 #define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) \
2536 syscall_access_range(GET_CALLER_PC(), (uptr)(p), (uptr)(s), true)
2537
2538 #define COMMON_SYSCALL_POST_READ_RANGE(p, s) \
2539 do { \
2540 (void)(p); \
2541 (void)(s); \
2542 } while (false)
2543
2544 #define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) \
2545 do { \
2546 (void)(p); \
2547 (void)(s); \
2548 } while (false)
2549
2550 #define COMMON_SYSCALL_ACQUIRE(addr) \
2551 syscall_acquire(GET_CALLER_PC(), (uptr)(addr))
2552
2553 #define COMMON_SYSCALL_RELEASE(addr) \
2554 syscall_release(GET_CALLER_PC(), (uptr)(addr))
2555
2556 #define COMMON_SYSCALL_FD_CLOSE(fd) syscall_fd_close(GET_CALLER_PC(), fd)
2557
2558 #define COMMON_SYSCALL_FD_ACQUIRE(fd) syscall_fd_acquire(GET_CALLER_PC(), fd)
2559
2560 #define COMMON_SYSCALL_FD_RELEASE(fd) syscall_fd_release(GET_CALLER_PC(), fd)
2561
2562 #define COMMON_SYSCALL_PRE_FORK() \
2563 syscall_pre_fork(GET_CALLER_PC())
2564
2565 #define COMMON_SYSCALL_POST_FORK(res) \
2566 syscall_post_fork(GET_CALLER_PC(), res)
2567
2568 #include "sanitizer_common/sanitizer_common_syscalls.inc"
2569 #include "sanitizer_common/sanitizer_syscalls_netbsd.inc"
2570
2571 #ifdef NEED_TLS_GET_ADDR
2572 // Define own interceptor instead of sanitizer_common's for three reasons:
2573 // 1. It must not process pending signals.
2574 // Signal handlers may contain MOVDQA instruction (see below).
2575 // 2. It must be as simple as possible to not contain MOVDQA.
2576 // 3. Sanitizer_common version uses COMMON_INTERCEPTOR_INITIALIZE_RANGE which
2577 // is empty for tsan (meant only for msan).
2578 // Note: __tls_get_addr can be called with mis-aligned stack due to:
2579 // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58066
2580 // So the interceptor must work with mis-aligned stack, in particular, does not
2581 // execute MOVDQA with stack addresses.
TSAN_INTERCEPTOR(void *,__tls_get_addr,void * arg)2582 TSAN_INTERCEPTOR(void *, __tls_get_addr, void *arg) {
2583 void *res = REAL(__tls_get_addr)(arg);
2584 ThreadState *thr = cur_thread();
2585 if (!thr)
2586 return res;
2587 DTLS::DTV *dtv = DTLS_on_tls_get_addr(arg, res, thr->tls_addr,
2588 thr->tls_addr + thr->tls_size);
2589 if (!dtv)
2590 return res;
2591 // New DTLS block has been allocated.
2592 MemoryResetRange(thr, 0, dtv->beg, dtv->size);
2593 return res;
2594 }
2595 #endif
2596
2597 #if SANITIZER_NETBSD
TSAN_INTERCEPTOR(void,_lwp_exit)2598 TSAN_INTERCEPTOR(void, _lwp_exit) {
2599 SCOPED_TSAN_INTERCEPTOR(_lwp_exit);
2600 DestroyThreadState();
2601 REAL(_lwp_exit)();
2602 }
2603 #define TSAN_MAYBE_INTERCEPT__LWP_EXIT TSAN_INTERCEPT(_lwp_exit)
2604 #else
2605 #define TSAN_MAYBE_INTERCEPT__LWP_EXIT
2606 #endif
2607
2608 #if SANITIZER_FREEBSD
TSAN_INTERCEPTOR(void,thr_exit,tid_t * state)2609 TSAN_INTERCEPTOR(void, thr_exit, tid_t *state) {
2610 SCOPED_TSAN_INTERCEPTOR(thr_exit, state);
2611 DestroyThreadState();
2612 REAL(thr_exit(state));
2613 }
2614 #define TSAN_MAYBE_INTERCEPT_THR_EXIT TSAN_INTERCEPT(thr_exit)
2615 #else
2616 #define TSAN_MAYBE_INTERCEPT_THR_EXIT
2617 #endif
2618
2619 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_init, void *c, void *a)
2620 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_signal, void *c)
2621 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_broadcast, void *c)
2622 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_wait, void *c, void *m)
2623 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_destroy, void *c)
2624 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, mutex_init, void *m, void *a)
2625 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, mutex_destroy, void *m)
2626 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, mutex_trylock, void *m)
2627 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_init, void *m, void *a)
2628 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_destroy, void *m)
2629 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_rdlock, void *m)
2630 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_tryrdlock, void *m)
2631 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_wrlock, void *m)
2632 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_trywrlock, void *m)
2633 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_unlock, void *m)
2634 TSAN_INTERCEPTOR_NETBSD_ALIAS_THR(int, once, void *o, void (*f)())
2635 TSAN_INTERCEPTOR_NETBSD_ALIAS_THR2(int, sigsetmask, sigmask, int a, void *b,
2636 void *c)
2637
2638 namespace __tsan {
2639
finalize(void * arg)2640 static void finalize(void *arg) {
2641 ThreadState *thr = cur_thread();
2642 int status = Finalize(thr);
2643 // Make sure the output is not lost.
2644 FlushStreams();
2645 if (status)
2646 Die();
2647 }
2648
2649 #if !SANITIZER_MAC && !SANITIZER_ANDROID
unreachable()2650 static void unreachable() {
2651 Report("FATAL: ThreadSanitizer: unreachable called\n");
2652 Die();
2653 }
2654 #endif
2655
2656 // Define default implementation since interception of libdispatch is optional.
InitializeLibdispatchInterceptors()2657 SANITIZER_WEAK_ATTRIBUTE void InitializeLibdispatchInterceptors() {}
2658
InitializeInterceptors()2659 void InitializeInterceptors() {
2660 #if !SANITIZER_MAC
2661 // We need to setup it early, because functions like dlsym() can call it.
2662 REAL(memset) = internal_memset;
2663 REAL(memcpy) = internal_memcpy;
2664 #endif
2665
2666 // Instruct libc malloc to consume less memory.
2667 #if SANITIZER_GLIBC
2668 mallopt(1, 0); // M_MXFAST
2669 mallopt(-3, 32*1024); // M_MMAP_THRESHOLD
2670 #endif
2671
2672 new(interceptor_ctx()) InterceptorContext();
2673
2674 InitializeCommonInterceptors();
2675 InitializeSignalInterceptors();
2676 InitializeLibdispatchInterceptors();
2677
2678 #if !SANITIZER_MAC
2679 // We can not use TSAN_INTERCEPT to get setjmp addr,
2680 // because it does &setjmp and setjmp is not present in some versions of libc.
2681 using __interception::InterceptFunction;
2682 InterceptFunction(TSAN_STRING_SETJMP, (uptr*)&REAL(setjmp_symname), 0, 0);
2683 InterceptFunction("_setjmp", (uptr*)&REAL(_setjmp), 0, 0);
2684 InterceptFunction(TSAN_STRING_SIGSETJMP, (uptr*)&REAL(sigsetjmp_symname), 0,
2685 0);
2686 #if !SANITIZER_NETBSD
2687 InterceptFunction("__sigsetjmp", (uptr*)&REAL(__sigsetjmp), 0, 0);
2688 #endif
2689 #endif
2690
2691 TSAN_INTERCEPT(longjmp_symname);
2692 TSAN_INTERCEPT(siglongjmp_symname);
2693 #if SANITIZER_NETBSD
2694 TSAN_INTERCEPT(_longjmp);
2695 #endif
2696
2697 TSAN_INTERCEPT(malloc);
2698 TSAN_INTERCEPT(__libc_memalign);
2699 TSAN_INTERCEPT(calloc);
2700 TSAN_INTERCEPT(realloc);
2701 TSAN_INTERCEPT(reallocarray);
2702 TSAN_INTERCEPT(free);
2703 TSAN_INTERCEPT(cfree);
2704 TSAN_INTERCEPT(munmap);
2705 TSAN_MAYBE_INTERCEPT_MEMALIGN;
2706 TSAN_INTERCEPT(valloc);
2707 TSAN_MAYBE_INTERCEPT_PVALLOC;
2708 TSAN_INTERCEPT(posix_memalign);
2709
2710 TSAN_INTERCEPT(strcpy);
2711 TSAN_INTERCEPT(strncpy);
2712 TSAN_INTERCEPT(strdup);
2713
2714 TSAN_INTERCEPT(pthread_create);
2715 TSAN_INTERCEPT(pthread_join);
2716 TSAN_INTERCEPT(pthread_detach);
2717 TSAN_INTERCEPT(pthread_exit);
2718 #if SANITIZER_LINUX
2719 TSAN_INTERCEPT(pthread_tryjoin_np);
2720 TSAN_INTERCEPT(pthread_timedjoin_np);
2721 #endif
2722
2723 TSAN_INTERCEPT_VER(pthread_cond_init, PTHREAD_ABI_BASE);
2724 TSAN_INTERCEPT_VER(pthread_cond_signal, PTHREAD_ABI_BASE);
2725 TSAN_INTERCEPT_VER(pthread_cond_broadcast, PTHREAD_ABI_BASE);
2726 TSAN_INTERCEPT_VER(pthread_cond_wait, PTHREAD_ABI_BASE);
2727 TSAN_INTERCEPT_VER(pthread_cond_timedwait, PTHREAD_ABI_BASE);
2728 TSAN_INTERCEPT_VER(pthread_cond_destroy, PTHREAD_ABI_BASE);
2729
2730 TSAN_MAYBE_PTHREAD_COND_CLOCKWAIT;
2731
2732 TSAN_INTERCEPT(pthread_mutex_init);
2733 TSAN_INTERCEPT(pthread_mutex_destroy);
2734 TSAN_INTERCEPT(pthread_mutex_trylock);
2735 TSAN_INTERCEPT(pthread_mutex_timedlock);
2736
2737 TSAN_INTERCEPT(pthread_spin_init);
2738 TSAN_INTERCEPT(pthread_spin_destroy);
2739 TSAN_INTERCEPT(pthread_spin_lock);
2740 TSAN_INTERCEPT(pthread_spin_trylock);
2741 TSAN_INTERCEPT(pthread_spin_unlock);
2742
2743 TSAN_INTERCEPT(pthread_rwlock_init);
2744 TSAN_INTERCEPT(pthread_rwlock_destroy);
2745 TSAN_INTERCEPT(pthread_rwlock_rdlock);
2746 TSAN_INTERCEPT(pthread_rwlock_tryrdlock);
2747 TSAN_INTERCEPT(pthread_rwlock_timedrdlock);
2748 TSAN_INTERCEPT(pthread_rwlock_wrlock);
2749 TSAN_INTERCEPT(pthread_rwlock_trywrlock);
2750 TSAN_INTERCEPT(pthread_rwlock_timedwrlock);
2751 TSAN_INTERCEPT(pthread_rwlock_unlock);
2752
2753 TSAN_INTERCEPT(pthread_barrier_init);
2754 TSAN_INTERCEPT(pthread_barrier_destroy);
2755 TSAN_INTERCEPT(pthread_barrier_wait);
2756
2757 TSAN_INTERCEPT(pthread_once);
2758
2759 TSAN_INTERCEPT(fstat);
2760 TSAN_MAYBE_INTERCEPT___FXSTAT;
2761 TSAN_MAYBE_INTERCEPT_FSTAT64;
2762 TSAN_MAYBE_INTERCEPT___FXSTAT64;
2763 TSAN_INTERCEPT(open);
2764 TSAN_MAYBE_INTERCEPT_OPEN64;
2765 TSAN_INTERCEPT(creat);
2766 TSAN_MAYBE_INTERCEPT_CREAT64;
2767 TSAN_INTERCEPT(dup);
2768 TSAN_INTERCEPT(dup2);
2769 TSAN_INTERCEPT(dup3);
2770 TSAN_MAYBE_INTERCEPT_EVENTFD;
2771 TSAN_MAYBE_INTERCEPT_SIGNALFD;
2772 TSAN_MAYBE_INTERCEPT_INOTIFY_INIT;
2773 TSAN_MAYBE_INTERCEPT_INOTIFY_INIT1;
2774 TSAN_INTERCEPT(socket);
2775 TSAN_INTERCEPT(socketpair);
2776 TSAN_INTERCEPT(connect);
2777 TSAN_INTERCEPT(bind);
2778 TSAN_INTERCEPT(listen);
2779 TSAN_MAYBE_INTERCEPT_EPOLL;
2780 TSAN_INTERCEPT(close);
2781 TSAN_MAYBE_INTERCEPT___CLOSE;
2782 TSAN_MAYBE_INTERCEPT___RES_ICLOSE;
2783 TSAN_INTERCEPT(pipe);
2784 TSAN_INTERCEPT(pipe2);
2785
2786 TSAN_INTERCEPT(unlink);
2787 TSAN_INTERCEPT(tmpfile);
2788 TSAN_MAYBE_INTERCEPT_TMPFILE64;
2789 TSAN_INTERCEPT(abort);
2790 TSAN_INTERCEPT(rmdir);
2791 TSAN_INTERCEPT(closedir);
2792
2793 TSAN_INTERCEPT(sigsuspend);
2794 TSAN_INTERCEPT(sigblock);
2795 TSAN_INTERCEPT(sigsetmask);
2796 TSAN_INTERCEPT(pthread_sigmask);
2797 TSAN_INTERCEPT(raise);
2798 TSAN_INTERCEPT(kill);
2799 TSAN_INTERCEPT(pthread_kill);
2800 TSAN_INTERCEPT(sleep);
2801 TSAN_INTERCEPT(usleep);
2802 TSAN_INTERCEPT(nanosleep);
2803 TSAN_INTERCEPT(pause);
2804 TSAN_INTERCEPT(gettimeofday);
2805 TSAN_INTERCEPT(getaddrinfo);
2806
2807 TSAN_INTERCEPT(fork);
2808 TSAN_INTERCEPT(vfork);
2809 #if !SANITIZER_ANDROID
2810 TSAN_INTERCEPT(dl_iterate_phdr);
2811 #endif
2812 TSAN_MAYBE_INTERCEPT_ON_EXIT;
2813 TSAN_INTERCEPT(__cxa_atexit);
2814 TSAN_INTERCEPT(_exit);
2815
2816 #ifdef NEED_TLS_GET_ADDR
2817 TSAN_INTERCEPT(__tls_get_addr);
2818 #endif
2819
2820 TSAN_MAYBE_INTERCEPT__LWP_EXIT;
2821 TSAN_MAYBE_INTERCEPT_THR_EXIT;
2822
2823 #if !SANITIZER_MAC && !SANITIZER_ANDROID
2824 // Need to setup it, because interceptors check that the function is resolved.
2825 // But atexit is emitted directly into the module, so can't be resolved.
2826 REAL(atexit) = (int(*)(void(*)()))unreachable;
2827 #endif
2828
2829 if (REAL(__cxa_atexit)(&finalize, 0, 0)) {
2830 Printf("ThreadSanitizer: failed to setup atexit callback\n");
2831 Die();
2832 }
2833
2834 #if !SANITIZER_MAC && !SANITIZER_NETBSD && !SANITIZER_FREEBSD
2835 if (pthread_key_create(&interceptor_ctx()->finalize_key, &thread_finalize)) {
2836 Printf("ThreadSanitizer: failed to create thread key\n");
2837 Die();
2838 }
2839 #endif
2840
2841 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(cond_init);
2842 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(cond_signal);
2843 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(cond_broadcast);
2844 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(cond_wait);
2845 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(cond_destroy);
2846 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(mutex_init);
2847 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(mutex_destroy);
2848 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(mutex_trylock);
2849 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_init);
2850 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_destroy);
2851 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_rdlock);
2852 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_tryrdlock);
2853 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_wrlock);
2854 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_trywrlock);
2855 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_unlock);
2856 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS_THR(once);
2857 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS_THR(sigsetmask);
2858
2859 FdInit();
2860 }
2861
2862 } // namespace __tsan
2863
2864 // Invisible barrier for tests.
2865 // There were several unsuccessful iterations for this functionality:
2866 // 1. Initially it was implemented in user code using
2867 // REAL(pthread_barrier_wait). But pthread_barrier_wait is not supported on
2868 // MacOS. Futexes are linux-specific for this matter.
2869 // 2. Then we switched to atomics+usleep(10). But usleep produced parasitic
2870 // "as-if synchronized via sleep" messages in reports which failed some
2871 // output tests.
2872 // 3. Then we switched to atomics+sched_yield. But this produced tons of tsan-
2873 // visible events, which lead to "failed to restore stack trace" failures.
2874 // Note that no_sanitize_thread attribute does not turn off atomic interception
2875 // so attaching it to the function defined in user code does not help.
2876 // That's why we now have what we have.
2877 extern "C" SANITIZER_INTERFACE_ATTRIBUTE
__tsan_testonly_barrier_init(u64 * barrier,u32 count)2878 void __tsan_testonly_barrier_init(u64 *barrier, u32 count) {
2879 if (count >= (1 << 8)) {
2880 Printf("barrier_init: count is too large (%d)\n", count);
2881 Die();
2882 }
2883 // 8 lsb is thread count, the remaining are count of entered threads.
2884 *barrier = count;
2885 }
2886
2887 extern "C" SANITIZER_INTERFACE_ATTRIBUTE
__tsan_testonly_barrier_wait(u64 * barrier)2888 void __tsan_testonly_barrier_wait(u64 *barrier) {
2889 unsigned old = __atomic_fetch_add(barrier, 1 << 8, __ATOMIC_RELAXED);
2890 unsigned old_epoch = (old >> 8) / (old & 0xff);
2891 for (;;) {
2892 unsigned cur = __atomic_load_n(barrier, __ATOMIC_RELAXED);
2893 unsigned cur_epoch = (cur >> 8) / (cur & 0xff);
2894 if (cur_epoch != old_epoch)
2895 return;
2896 internal_sched_yield();
2897 }
2898 }
2899