1 //===-- tsan_interceptors.cc ----------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file is a part of ThreadSanitizer (TSan), a race detector.
12 // FIXME: move as many interceptors as possible into
13 // sanitizer_common/sanitizer_common_interceptors.inc
14 //===----------------------------------------------------------------------===//
16 #include "sanitizer_common/sanitizer_atomic.h"
17 #include "sanitizer_common/sanitizer_errno.h"
18 #include "sanitizer_common/sanitizer_libc.h"
19 #include "sanitizer_common/sanitizer_linux.h"
20 #include "sanitizer_common/sanitizer_platform_limits_netbsd.h"
21 #include "sanitizer_common/sanitizer_platform_limits_posix.h"
22 #include "sanitizer_common/sanitizer_placement_new.h"
23 #include "sanitizer_common/sanitizer_posix.h"
24 #include "sanitizer_common/sanitizer_stacktrace.h"
25 #include "sanitizer_common/sanitizer_tls_get_addr.h"
26 #include "interception/interception.h"
27 #include "tsan_interceptors.h"
28 #include "tsan_interface.h"
29 #include "tsan_platform.h"
30 #include "tsan_suppressions.h"
32 #include "tsan_mman.h"
36 using namespace __tsan; // NOLINT
38 #if SANITIZER_FREEBSD || SANITIZER_MAC
39 #define stdout __stdoutp
40 #define stderr __stderrp
44 #define dirfd(dirp) (*(int *)(dirp))
45 #define fileno_unlocked(fp) \
46 (((__sanitizer_FILE*)fp)->_file == -1 ? -1 : \
47 (int)(unsigned short)(((__sanitizer_FILE*)fp)->_file)) // NOLINT
49 #define stdout ((__sanitizer_FILE*)&__sF[1])
50 #define stderr ((__sanitizer_FILE*)&__sF[2])
52 #define nanosleep __nanosleep50
53 #define vfork __vfork14
61 const int kSigCount = 129;
63 const int kSigCount = 65;
68 u64 opaque[768 / sizeof(u64) + 1];
72 // The size is determined by looking at sizeof of real ucontext_t on linux.
73 u64 opaque[936 / sizeof(u64) + 1];
77 #if defined(__x86_64__) || defined(__mips__) || SANITIZER_PPC64V1
78 #define PTHREAD_ABI_BASE "GLIBC_2.3.2"
79 #elif defined(__aarch64__) || SANITIZER_PPC64V2
80 #define PTHREAD_ABI_BASE "GLIBC_2.17"
83 extern "C" int pthread_attr_init(void *attr);
84 extern "C" int pthread_attr_destroy(void *attr);
85 DECLARE_REAL(int, pthread_attr_getdetachstate, void *, void *)
86 extern "C" int pthread_attr_setstacksize(void *attr, uptr stacksize);
87 extern "C" int pthread_key_create(unsigned *key, void (*destructor)(void* v));
88 extern "C" int pthread_setspecific(unsigned key, const void *v);
89 DECLARE_REAL(int, pthread_mutexattr_gettype, void *, void *)
90 DECLARE_REAL(int, fflush, __sanitizer_FILE *fp)
91 DECLARE_REAL_AND_INTERCEPTOR(void *, malloc, uptr size)
92 DECLARE_REAL_AND_INTERCEPTOR(void, free, void *ptr)
93 extern "C" void *pthread_self();
94 extern "C" void _exit(int status);
96 extern "C" int fileno_unlocked(void *stream);
97 extern "C" int dirfd(void *dirp);
99 #if !SANITIZER_FREEBSD && !SANITIZER_ANDROID && !SANITIZER_NETBSD
100 extern "C" int mallopt(int param, int value);
103 extern __sanitizer_FILE __sF[];
105 extern __sanitizer_FILE *stdout, *stderr;
107 #if !SANITIZER_FREEBSD && !SANITIZER_MAC && !SANITIZER_NETBSD
108 const int PTHREAD_MUTEX_RECURSIVE = 1;
109 const int PTHREAD_MUTEX_RECURSIVE_NP = 1;
111 const int PTHREAD_MUTEX_RECURSIVE = 2;
112 const int PTHREAD_MUTEX_RECURSIVE_NP = 2;
114 #if !SANITIZER_FREEBSD && !SANITIZER_MAC && !SANITIZER_NETBSD
115 const int EPOLL_CTL_ADD = 1;
117 const int SIGILL = 4;
118 const int SIGABRT = 6;
119 const int SIGFPE = 8;
120 const int SIGSEGV = 11;
121 const int SIGPIPE = 13;
122 const int SIGTERM = 15;
123 #if defined(__mips__) || SANITIZER_FREEBSD || SANITIZER_MAC || SANITIZER_NETBSD
124 const int SIGBUS = 10;
125 const int SIGSYS = 12;
127 const int SIGBUS = 7;
128 const int SIGSYS = 31;
130 void *const MAP_FAILED = (void*)-1;
132 const int PTHREAD_BARRIER_SERIAL_THREAD = 1234567;
134 const int PTHREAD_BARRIER_SERIAL_THREAD = -1;
136 const int MAP_FIXED = 0x10;
137 typedef long long_t; // NOLINT
139 // From /usr/include/unistd.h
140 # define F_ULOCK 0 /* Unlock a previously locked region. */
141 # define F_LOCK 1 /* Lock a region for exclusive use. */
142 # define F_TLOCK 2 /* Test and lock a region for exclusive use. */
143 # define F_TEST 3 /* Test a region for other processes locks. */
145 #if SANITIZER_FREEBSD || SANITIZER_MAC || SANITIZER_NETBSD
146 const int SA_SIGINFO = 0x40;
147 const int SIG_SETMASK = 3;
148 #elif defined(__mips__)
149 const int SA_SIGINFO = 8;
150 const int SIG_SETMASK = 3;
152 const int SA_SIGINFO = 4;
153 const int SIG_SETMASK = 2;
156 #define COMMON_INTERCEPTOR_NOTHING_IS_INITIALIZED \
157 (!cur_thread()->is_inited)
163 __sanitizer_siginfo siginfo;
167 struct ThreadSignalContext {
169 atomic_uintptr_t in_blocking_func;
170 atomic_uintptr_t have_pending_signals;
171 SignalDesc pending_signals[kSigCount];
172 // emptyset and oldset are too big for stack.
173 __sanitizer_sigset_t emptyset;
174 __sanitizer_sigset_t oldset;
177 // The sole reason tsan wraps atexit callbacks is to establish synchronization
178 // between callback setup and callback execution.
184 // InterceptorContext holds all global data required for interceptors.
185 // It's explicitly constructed in InitializeInterceptors with placement new
186 // and is never destroyed. This allows usage of members with non-trivial
187 // constructors and destructors.
188 struct InterceptorContext {
189 // The object is 64-byte aligned, because we want hot data to be located
190 // in a single cache line if possible (it's accessed in every interceptor).
191 ALIGNED(64) LibIgnore libignore;
192 __sanitizer_sigaction sigactions[kSigCount];
193 #if !SANITIZER_MAC && !SANITIZER_NETBSD
194 unsigned finalize_key;
197 BlockingMutex atexit_mu;
198 Vector<struct AtExitCtx *> AtExitStack;
201 : libignore(LINKER_INITIALIZED), AtExitStack() {
205 static ALIGNED(64) char interceptor_placeholder[sizeof(InterceptorContext)];
206 InterceptorContext *interceptor_ctx() {
207 return reinterpret_cast<InterceptorContext*>(&interceptor_placeholder[0]);
210 LibIgnore *libignore() {
211 return &interceptor_ctx()->libignore;
214 void InitializeLibIgnore() {
215 const SuppressionContext &supp = *Suppressions();
216 const uptr n = supp.SuppressionCount();
217 for (uptr i = 0; i < n; i++) {
218 const Suppression *s = supp.SuppressionAt(i);
219 if (0 == internal_strcmp(s->type, kSuppressionLib))
220 libignore()->AddIgnoredLibrary(s->templ);
222 if (flags()->ignore_noninstrumented_modules)
223 libignore()->IgnoreNoninstrumentedModules(true);
224 libignore()->OnLibraryLoaded(0);
227 // The following two hooks can be used by for cooperative scheduling when
229 #ifdef TSAN_EXTERNAL_HOOKS
230 void OnPotentiallyBlockingRegionBegin();
231 void OnPotentiallyBlockingRegionEnd();
233 SANITIZER_WEAK_CXX_DEFAULT_IMPL void OnPotentiallyBlockingRegionBegin() {}
234 SANITIZER_WEAK_CXX_DEFAULT_IMPL void OnPotentiallyBlockingRegionEnd() {}
237 } // namespace __tsan
239 static ThreadSignalContext *SigCtx(ThreadState *thr) {
240 ThreadSignalContext *ctx = (ThreadSignalContext*)thr->signal_ctx;
241 if (ctx == 0 && !thr->is_dead) {
242 ctx = (ThreadSignalContext*)MmapOrDie(sizeof(*ctx), "ThreadSignalContext");
243 MemoryResetRange(thr, (uptr)&SigCtx, (uptr)ctx, sizeof(*ctx));
244 thr->signal_ctx = ctx;
249 ScopedInterceptor::ScopedInterceptor(ThreadState *thr, const char *fname,
251 : thr_(thr), pc_(pc), in_ignored_lib_(false), ignoring_(false) {
253 if (!thr_->is_inited) return;
254 if (!thr_->ignore_interceptors) FuncEntry(thr, pc);
255 DPrintf("#%d: intercept %s()\n", thr_->tid, fname);
257 !thr_->in_ignored_lib && libignore()->IsIgnored(pc, &in_ignored_lib_);
261 ScopedInterceptor::~ScopedInterceptor() {
262 if (!thr_->is_inited) return;
264 if (!thr_->ignore_interceptors) {
265 ProcessPendingSignals(thr_);
271 void ScopedInterceptor::EnableIgnores() {
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;
282 void ScopedInterceptor::DisableIgnores() {
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;
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)
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)
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)
314 #define READ_STRING(thr, pc, s, n) \
315 READ_STRING_OF_LEN((thr), (pc), (s), internal_strlen(s), (n))
317 #define BLOCK_REAL(name) (BlockingCall(thr), REAL(name))
319 struct BlockingCall {
320 explicit BlockingCall(ThreadState *thr)
324 atomic_store(&ctx->in_blocking_func, 1, memory_order_relaxed);
325 if (atomic_load(&ctx->have_pending_signals, memory_order_relaxed) == 0)
327 atomic_store(&ctx->in_blocking_func, 0, memory_order_relaxed);
328 ProcessPendingSignals(thr);
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++;
339 thr->ignore_interceptors--;
340 atomic_store(&ctx->in_blocking_func, 0, memory_order_relaxed);
344 ThreadSignalContext *ctx;
347 TSAN_INTERCEPTOR(unsigned, sleep, unsigned sec) {
348 SCOPED_TSAN_INTERCEPTOR(sleep, sec);
349 unsigned res = BLOCK_REAL(sleep)(sec);
354 TSAN_INTERCEPTOR(int, usleep, long_t usec) {
355 SCOPED_TSAN_INTERCEPTOR(usleep, usec);
356 int res = BLOCK_REAL(usleep)(usec);
361 TSAN_INTERCEPTOR(int, nanosleep, void *req, void *rem) {
362 SCOPED_TSAN_INTERCEPTOR(nanosleep, req, rem);
363 int res = BLOCK_REAL(nanosleep)(req, rem);
368 TSAN_INTERCEPTOR(int, pause, int fake) {
369 SCOPED_TSAN_INTERCEPTOR(pause, fake);
370 return BLOCK_REAL(pause)(fake);
373 static void at_exit_wrapper() {
376 // Ensure thread-safety.
377 BlockingMutexLock l(&interceptor_ctx()->atexit_mu);
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();
385 Acquire(cur_thread(), (uptr)0, (uptr)ctx);
386 ((void(*)())ctx->f)();
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);
397 static int setup_at_exit_wrapper(ThreadState *thr, uptr pc, void(*f)(),
398 void *arg, void *dso);
400 #if !SANITIZER_ANDROID
401 TSAN_INTERCEPTOR(int, atexit, void (*f)()) {
402 if (UNLIKELY(cur_thread()->in_symbolizer))
404 // We want to setup the atexit callback even if we are in ignored lib
406 SCOPED_INTERCEPTOR_RAW(atexit, f);
407 return setup_at_exit_wrapper(thr, pc, (void(*)())f, 0, 0);
411 TSAN_INTERCEPTOR(int, __cxa_atexit, void (*f)(void *a), void *arg, void *dso) {
412 if (UNLIKELY(cur_thread()->in_symbolizer))
414 SCOPED_TSAN_INTERCEPTOR(__cxa_atexit, f, arg, dso);
415 return setup_at_exit_wrapper(thr, pc, (void(*)())f, arg, 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));
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);
429 // NetBSD does not preserve the 2nd argument if dso is equal to 0
430 // Store ctx in a local stack-like structure
432 // Ensure thread-safety.
433 BlockingMutexLock l(&interceptor_ctx()->atexit_mu);
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
438 interceptor_ctx()->AtExitStack.PushBack(ctx);
441 res = REAL(__cxa_atexit)(cxa_at_exit_wrapper, ctx, dso);
443 ThreadIgnoreEnd(thr, pc);
447 #if !SANITIZER_MAC && !SANITIZER_NETBSD
448 static void on_exit_wrapper(int status, void *arg) {
449 ThreadState *thr = cur_thread();
451 Acquire(thr, pc, (uptr)arg);
452 AtExitCtx *ctx = (AtExitCtx*)arg;
453 ((void(*)(int status, void *arg))ctx->f)(status, ctx->arg);
457 TSAN_INTERCEPTOR(int, on_exit, void(*f)(int, void*), void *arg) {
458 if (UNLIKELY(cur_thread()->in_symbolizer))
460 SCOPED_TSAN_INTERCEPTOR(on_exit, f, arg);
461 AtExitCtx *ctx = (AtExitCtx*)InternalAlloc(sizeof(AtExitCtx));
462 ctx->f = (void(*)())f;
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);
472 #define TSAN_MAYBE_INTERCEPT_ON_EXIT TSAN_INTERCEPT(on_exit)
474 #define TSAN_MAYBE_INTERCEPT_ON_EXIT
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];
482 uptr sz = thr->jmp_bufs.Size();
483 internal_memcpy(buf, &thr->jmp_bufs[sz - 1], sizeof(*buf));
484 thr->jmp_bufs.PopBack();
490 static void SetJmp(ThreadState *thr, uptr sp, uptr mangled_sp) {
491 if (!thr->is_inited) // called from libc guts during bootstrap
494 JmpBufGarbageCollect(thr, sp);
496 JmpBuf *buf = thr->jmp_bufs.PushBack();
498 buf->mangled_sp = mangled_sp;
499 buf->shadow_stack_pos = thr->shadow_stack_pos;
500 ThreadSignalContext *sctx = SigCtx(thr);
501 buf->int_signal_send = sctx ? sctx->int_signal_send : 0;
502 buf->in_blocking_func = sctx ?
503 atomic_load(&sctx->in_blocking_func, memory_order_relaxed) :
505 buf->in_signal_handler = atomic_load(&thr->in_signal_handler,
506 memory_order_relaxed);
509 static void LongJmp(ThreadState *thr, uptr *env) {
511 uptr mangled_sp = env[0];
512 #elif SANITIZER_FREEBSD
513 uptr mangled_sp = env[2];
514 #elif SANITIZER_NETBSD
515 uptr mangled_sp = env[6];
519 (GetMacosVersion() >= MACOS_VERSION_MOJAVE) ? env[12] : env[13];
521 uptr mangled_sp = env[2];
523 #elif SANITIZER_LINUX
525 uptr mangled_sp = env[13];
526 # elif defined(__mips64)
527 uptr mangled_sp = env[1];
529 uptr mangled_sp = env[6];
532 // Find the saved buf by mangled_sp.
533 for (uptr i = 0; i < thr->jmp_bufs.Size(); i++) {
534 JmpBuf *buf = &thr->jmp_bufs[i];
535 if (buf->mangled_sp == mangled_sp) {
536 CHECK_GE(thr->shadow_stack_pos, buf->shadow_stack_pos);
538 while (thr->shadow_stack_pos > buf->shadow_stack_pos)
540 ThreadSignalContext *sctx = SigCtx(thr);
542 sctx->int_signal_send = buf->int_signal_send;
543 atomic_store(&sctx->in_blocking_func, buf->in_blocking_func,
544 memory_order_relaxed);
546 atomic_store(&thr->in_signal_handler, buf->in_signal_handler,
547 memory_order_relaxed);
548 JmpBufGarbageCollect(thr, buf->sp - 1); // do not collect buf->sp
552 Printf("ThreadSanitizer: can't find longjmp buf\n");
556 // FIXME: put everything below into a common extern "C" block?
557 extern "C" void __tsan_setjmp(uptr sp, uptr mangled_sp) {
558 SetJmp(cur_thread(), sp, mangled_sp);
562 TSAN_INTERCEPTOR(int, setjmp, void *env);
563 TSAN_INTERCEPTOR(int, _setjmp, void *env);
564 TSAN_INTERCEPTOR(int, sigsetjmp, void *env);
565 #else // SANITIZER_MAC
568 #define setjmp_symname __setjmp14
569 #define sigsetjmp_symname __sigsetjmp14
571 #define setjmp_symname setjmp
572 #define sigsetjmp_symname sigsetjmp
575 #define TSAN_INTERCEPTOR_SETJMP_(x) __interceptor_ ## x
576 #define TSAN_INTERCEPTOR_SETJMP__(x) TSAN_INTERCEPTOR_SETJMP_(x)
577 #define TSAN_INTERCEPTOR_SETJMP TSAN_INTERCEPTOR_SETJMP__(setjmp_symname)
578 #define TSAN_INTERCEPTOR_SIGSETJMP TSAN_INTERCEPTOR_SETJMP__(sigsetjmp_symname)
580 #define TSAN_STRING_SETJMP SANITIZER_STRINGIFY(setjmp_symname)
581 #define TSAN_STRING_SIGSETJMP SANITIZER_STRINGIFY(sigsetjmp_symname)
583 // Not called. Merely to satisfy TSAN_INTERCEPT().
584 extern "C" SANITIZER_INTERFACE_ATTRIBUTE
585 int TSAN_INTERCEPTOR_SETJMP(void *env);
586 extern "C" int TSAN_INTERCEPTOR_SETJMP(void *env) {
591 // FIXME: any reason to have a separate declaration?
592 extern "C" SANITIZER_INTERFACE_ATTRIBUTE
593 int __interceptor__setjmp(void *env);
594 extern "C" int __interceptor__setjmp(void *env) {
599 extern "C" SANITIZER_INTERFACE_ATTRIBUTE
600 int TSAN_INTERCEPTOR_SIGSETJMP(void *env);
601 extern "C" int TSAN_INTERCEPTOR_SIGSETJMP(void *env) {
606 #if !SANITIZER_NETBSD
607 extern "C" SANITIZER_INTERFACE_ATTRIBUTE
608 int __interceptor___sigsetjmp(void *env);
609 extern "C" int __interceptor___sigsetjmp(void *env) {
615 extern "C" int setjmp_symname(void *env);
616 extern "C" int _setjmp(void *env);
617 extern "C" int sigsetjmp_symname(void *env);
618 #if !SANITIZER_NETBSD
619 extern "C" int __sigsetjmp(void *env);
621 DEFINE_REAL(int, setjmp_symname, void *env)
622 DEFINE_REAL(int, _setjmp, void *env)
623 DEFINE_REAL(int, sigsetjmp_symname, void *env)
624 #if !SANITIZER_NETBSD
625 DEFINE_REAL(int, __sigsetjmp, void *env)
627 #endif // SANITIZER_MAC
630 #define longjmp_symname __longjmp14
631 #define siglongjmp_symname __siglongjmp14
633 #define longjmp_symname longjmp
634 #define siglongjmp_symname siglongjmp
637 TSAN_INTERCEPTOR(void, longjmp_symname, uptr *env, int val) {
638 // Note: if we call REAL(longjmp) in the context of ScopedInterceptor,
639 // bad things will happen. We will jump over ScopedInterceptor dtor and can
640 // leave thr->in_ignored_lib set.
642 SCOPED_INTERCEPTOR_RAW(longjmp_symname, env, val);
644 LongJmp(cur_thread(), env);
645 REAL(longjmp_symname)(env, val);
648 TSAN_INTERCEPTOR(void, siglongjmp_symname, uptr *env, int val) {
650 SCOPED_INTERCEPTOR_RAW(siglongjmp_symname, env, val);
652 LongJmp(cur_thread(), env);
653 REAL(siglongjmp_symname)(env, val);
657 TSAN_INTERCEPTOR(void, _longjmp, uptr *env, int val) {
659 SCOPED_INTERCEPTOR_RAW(_longjmp, env, val);
661 LongJmp(cur_thread(), env);
662 REAL(_longjmp)(env, val);
667 TSAN_INTERCEPTOR(void*, malloc, uptr size) {
668 if (UNLIKELY(cur_thread()->in_symbolizer))
669 return InternalAlloc(size);
672 SCOPED_INTERCEPTOR_RAW(malloc, size);
673 p = user_alloc(thr, pc, size);
675 invoke_malloc_hook(p, size);
679 TSAN_INTERCEPTOR(void*, __libc_memalign, uptr align, uptr sz) {
680 SCOPED_TSAN_INTERCEPTOR(__libc_memalign, align, sz);
681 return user_memalign(thr, pc, align, sz);
684 TSAN_INTERCEPTOR(void*, calloc, uptr size, uptr n) {
685 if (UNLIKELY(cur_thread()->in_symbolizer))
686 return InternalCalloc(size, n);
689 SCOPED_INTERCEPTOR_RAW(calloc, size, n);
690 p = user_calloc(thr, pc, size, n);
692 invoke_malloc_hook(p, n * size);
696 TSAN_INTERCEPTOR(void*, realloc, void *p, uptr size) {
697 if (UNLIKELY(cur_thread()->in_symbolizer))
698 return InternalRealloc(p, size);
702 SCOPED_INTERCEPTOR_RAW(realloc, p, size);
703 p = user_realloc(thr, pc, p, size);
705 invoke_malloc_hook(p, size);
709 TSAN_INTERCEPTOR(void, free, void *p) {
712 if (UNLIKELY(cur_thread()->in_symbolizer))
713 return InternalFree(p);
715 SCOPED_INTERCEPTOR_RAW(free, p);
716 user_free(thr, pc, p);
719 TSAN_INTERCEPTOR(void, cfree, void *p) {
722 if (UNLIKELY(cur_thread()->in_symbolizer))
723 return InternalFree(p);
725 SCOPED_INTERCEPTOR_RAW(cfree, p);
726 user_free(thr, pc, p);
729 TSAN_INTERCEPTOR(uptr, malloc_usable_size, void *p) {
730 SCOPED_INTERCEPTOR_RAW(malloc_usable_size, p);
731 return user_alloc_usable_size(p);
735 TSAN_INTERCEPTOR(char*, strcpy, char *dst, const char *src) { // NOLINT
736 SCOPED_TSAN_INTERCEPTOR(strcpy, dst, src); // NOLINT
737 uptr srclen = internal_strlen(src);
738 MemoryAccessRange(thr, pc, (uptr)dst, srclen + 1, true);
739 MemoryAccessRange(thr, pc, (uptr)src, srclen + 1, false);
740 return REAL(strcpy)(dst, src); // NOLINT
743 TSAN_INTERCEPTOR(char*, strncpy, char *dst, char *src, uptr n) {
744 SCOPED_TSAN_INTERCEPTOR(strncpy, dst, src, n);
745 uptr srclen = internal_strnlen(src, n);
746 MemoryAccessRange(thr, pc, (uptr)dst, n, true);
747 MemoryAccessRange(thr, pc, (uptr)src, min(srclen + 1, n), false);
748 return REAL(strncpy)(dst, src, n);
751 TSAN_INTERCEPTOR(char*, strdup, const char *str) {
752 SCOPED_TSAN_INTERCEPTOR(strdup, str);
753 // strdup will call malloc, so no instrumentation is required here.
754 return REAL(strdup)(str);
757 static bool fix_mmap_addr(void **addr, long_t sz, int flags) {
759 if (!IsAppMem((uptr)*addr) || !IsAppMem((uptr)*addr + sz - 1)) {
760 if (flags & MAP_FIXED) {
761 errno = errno_EINVAL;
771 template <class Mmap>
772 static void *mmap_interceptor(ThreadState *thr, uptr pc, Mmap real_mmap,
773 void *addr, SIZE_T sz, int prot, int flags,
774 int fd, OFF64_T off) {
775 if (!fix_mmap_addr(&addr, sz, flags)) return MAP_FAILED;
776 void *res = real_mmap(addr, sz, prot, flags, fd, off);
777 if (res != MAP_FAILED) {
778 if (fd > 0) FdAccess(thr, pc, fd);
779 if (thr->ignore_reads_and_writes == 0)
780 MemoryRangeImitateWrite(thr, pc, (uptr)res, sz);
782 MemoryResetRange(thr, pc, (uptr)res, sz);
787 TSAN_INTERCEPTOR(int, munmap, void *addr, long_t sz) {
788 SCOPED_TSAN_INTERCEPTOR(munmap, addr, sz);
790 // If sz == 0, munmap will return EINVAL and don't unmap any memory.
791 DontNeedShadowFor((uptr)addr, sz);
792 ScopedGlobalProcessor sgp;
793 ctx->metamap.ResetRange(thr->proc(), (uptr)addr, (uptr)sz);
795 int res = REAL(munmap)(addr, sz);
800 TSAN_INTERCEPTOR(void*, memalign, uptr align, uptr sz) {
801 SCOPED_INTERCEPTOR_RAW(memalign, align, sz);
802 return user_memalign(thr, pc, align, sz);
804 #define TSAN_MAYBE_INTERCEPT_MEMALIGN TSAN_INTERCEPT(memalign)
806 #define TSAN_MAYBE_INTERCEPT_MEMALIGN
810 TSAN_INTERCEPTOR(void*, aligned_alloc, uptr align, uptr sz) {
811 if (UNLIKELY(cur_thread()->in_symbolizer))
812 return InternalAlloc(sz, nullptr, align);
813 SCOPED_INTERCEPTOR_RAW(aligned_alloc, align, sz);
814 return user_aligned_alloc(thr, pc, align, sz);
817 TSAN_INTERCEPTOR(void*, valloc, uptr sz) {
818 if (UNLIKELY(cur_thread()->in_symbolizer))
819 return InternalAlloc(sz, nullptr, GetPageSizeCached());
820 SCOPED_INTERCEPTOR_RAW(valloc, sz);
821 return user_valloc(thr, pc, sz);
826 TSAN_INTERCEPTOR(void*, pvalloc, uptr sz) {
827 if (UNLIKELY(cur_thread()->in_symbolizer)) {
828 uptr PageSize = GetPageSizeCached();
829 sz = sz ? RoundUpTo(sz, PageSize) : PageSize;
830 return InternalAlloc(sz, nullptr, PageSize);
832 SCOPED_INTERCEPTOR_RAW(pvalloc, sz);
833 return user_pvalloc(thr, pc, sz);
835 #define TSAN_MAYBE_INTERCEPT_PVALLOC TSAN_INTERCEPT(pvalloc)
837 #define TSAN_MAYBE_INTERCEPT_PVALLOC
841 TSAN_INTERCEPTOR(int, posix_memalign, void **memptr, uptr align, uptr sz) {
842 if (UNLIKELY(cur_thread()->in_symbolizer)) {
843 void *p = InternalAlloc(sz, nullptr, align);
849 SCOPED_INTERCEPTOR_RAW(posix_memalign, memptr, align, sz);
850 return user_posix_memalign(thr, pc, memptr, align, sz);
854 // __cxa_guard_acquire and friends need to be intercepted in a special way -
855 // regular interceptors will break statically-linked libstdc++. Linux
856 // interceptors are especially defined as weak functions (so that they don't
857 // cause link errors when user defines them as well). So they silently
858 // auto-disable themselves when such symbol is already present in the binary. If
859 // we link libstdc++ statically, it will bring own __cxa_guard_acquire which
860 // will silently replace our interceptor. That's why on Linux we simply export
861 // these interceptors with INTERFACE_ATTRIBUTE.
862 // On OS X, we don't support statically linking, so we just use a regular
865 #define STDCXX_INTERCEPTOR TSAN_INTERCEPTOR
867 #define STDCXX_INTERCEPTOR(rettype, name, ...) \
868 extern "C" rettype INTERFACE_ATTRIBUTE name(__VA_ARGS__)
871 // Used in thread-safe function static initialization.
872 STDCXX_INTERCEPTOR(int, __cxa_guard_acquire, atomic_uint32_t *g) {
873 SCOPED_INTERCEPTOR_RAW(__cxa_guard_acquire, g);
874 OnPotentiallyBlockingRegionBegin();
875 auto on_exit = at_scope_exit(&OnPotentiallyBlockingRegionEnd);
877 u32 cmp = atomic_load(g, memory_order_acquire);
879 if (atomic_compare_exchange_strong(g, &cmp, 1<<16, memory_order_relaxed))
881 } else if (cmp == 1) {
882 Acquire(thr, pc, (uptr)g);
885 internal_sched_yield();
890 STDCXX_INTERCEPTOR(void, __cxa_guard_release, atomic_uint32_t *g) {
891 SCOPED_INTERCEPTOR_RAW(__cxa_guard_release, g);
892 Release(thr, pc, (uptr)g);
893 atomic_store(g, 1, memory_order_release);
896 STDCXX_INTERCEPTOR(void, __cxa_guard_abort, atomic_uint32_t *g) {
897 SCOPED_INTERCEPTOR_RAW(__cxa_guard_abort, g);
898 atomic_store(g, 0, memory_order_relaxed);
902 void DestroyThreadState() {
903 ThreadState *thr = cur_thread();
904 Processor *proc = thr->proc();
906 ProcUnwire(proc, thr);
908 ThreadSignalContext *sctx = thr->signal_ctx;
911 UnmapOrDie(sctx, sizeof(*sctx));
914 cur_thread_finalize();
916 } // namespace __tsan
918 #if !SANITIZER_MAC && !SANITIZER_NETBSD && !SANITIZER_FREEBSD
919 static void thread_finalize(void *v) {
922 if (pthread_setspecific(interceptor_ctx()->finalize_key,
923 (void*)(iter - 1))) {
924 Printf("ThreadSanitizer: failed to set thread key\n");
929 DestroyThreadState();
935 void* (*callback)(void *arg);
937 atomic_uintptr_t tid;
940 extern "C" void *__tsan_thread_start_func(void *arg) {
941 ThreadParam *p = (ThreadParam*)arg;
942 void* (*callback)(void *arg) = p->callback;
943 void *param = p->param;
946 ThreadState *thr = cur_thread();
947 // Thread-local state is not initialized yet.
948 ScopedIgnoreInterceptors ignore;
949 #if !SANITIZER_MAC && !SANITIZER_NETBSD && !SANITIZER_FREEBSD
950 ThreadIgnoreBegin(thr, 0);
951 if (pthread_setspecific(interceptor_ctx()->finalize_key,
952 (void *)GetPthreadDestructorIterations())) {
953 Printf("ThreadSanitizer: failed to set thread key\n");
956 ThreadIgnoreEnd(thr, 0);
958 while ((tid = atomic_load(&p->tid, memory_order_acquire)) == 0)
959 internal_sched_yield();
960 Processor *proc = ProcCreate();
962 ThreadStart(thr, tid, GetTid(), /*workerthread*/ false);
963 atomic_store(&p->tid, 0, memory_order_release);
965 void *res = callback(param);
966 // Prevent the callback from being tail called,
967 // it mixes up stack traces.
968 volatile int foo = 42;
973 TSAN_INTERCEPTOR(int, pthread_create,
974 void *th, void *attr, void *(*callback)(void*), void * param) {
975 SCOPED_INTERCEPTOR_RAW(pthread_create, th, attr, callback, param);
977 MaybeSpawnBackgroundThread();
979 if (ctx->after_multithreaded_fork) {
980 if (flags()->die_after_fork) {
981 Report("ThreadSanitizer: starting new threads after multi-threaded "
982 "fork is not supported. Dying (set die_after_fork=0 to override)\n");
985 VPrintf(1, "ThreadSanitizer: starting new threads after multi-threaded "
986 "fork is not supported (pid %d). Continuing because of "
987 "die_after_fork=0, but you are on your own\n", internal_getpid());
990 __sanitizer_pthread_attr_t myattr;
992 pthread_attr_init(&myattr);
996 REAL(pthread_attr_getdetachstate)(attr, &detached);
997 AdjustStackSize(attr);
1000 p.callback = callback;
1002 atomic_store(&p.tid, 0, memory_order_relaxed);
1005 // Otherwise we see false positives in pthread stack manipulation.
1006 ScopedIgnoreInterceptors ignore;
1007 ThreadIgnoreBegin(thr, pc);
1008 res = REAL(pthread_create)(th, attr, __tsan_thread_start_func, &p);
1009 ThreadIgnoreEnd(thr, pc);
1012 int tid = ThreadCreate(thr, pc, *(uptr*)th, IsStateDetached(detached));
1014 // Synchronization on p.tid serves two purposes:
1015 // 1. ThreadCreate must finish before the new thread starts.
1016 // Otherwise the new thread can call pthread_detach, but the pthread_t
1017 // identifier is not yet registered in ThreadRegistry by ThreadCreate.
1018 // 2. ThreadStart must finish before this thread continues.
1019 // Otherwise, this thread can call pthread_detach and reset thr->sync
1020 // before the new thread got a chance to acquire from it in ThreadStart.
1021 atomic_store(&p.tid, tid, memory_order_release);
1022 while (atomic_load(&p.tid, memory_order_acquire) != 0)
1023 internal_sched_yield();
1025 if (attr == &myattr)
1026 pthread_attr_destroy(&myattr);
1030 TSAN_INTERCEPTOR(int, pthread_join, void *th, void **ret) {
1031 SCOPED_INTERCEPTOR_RAW(pthread_join, th, ret);
1032 int tid = ThreadTid(thr, pc, (uptr)th);
1033 ThreadIgnoreBegin(thr, pc);
1034 int res = BLOCK_REAL(pthread_join)(th, ret);
1035 ThreadIgnoreEnd(thr, pc);
1037 ThreadJoin(thr, pc, tid);
1042 DEFINE_REAL_PTHREAD_FUNCTIONS
1044 TSAN_INTERCEPTOR(int, pthread_detach, void *th) {
1045 SCOPED_TSAN_INTERCEPTOR(pthread_detach, th);
1046 int tid = ThreadTid(thr, pc, (uptr)th);
1047 int res = REAL(pthread_detach)(th);
1049 ThreadDetach(thr, pc, tid);
1055 TSAN_INTERCEPTOR(int, pthread_tryjoin_np, void *th, void **ret) {
1056 SCOPED_TSAN_INTERCEPTOR(pthread_tryjoin_np, th, ret);
1057 int tid = ThreadTid(thr, pc, (uptr)th);
1058 ThreadIgnoreBegin(thr, pc);
1059 int res = REAL(pthread_tryjoin_np)(th, ret);
1060 ThreadIgnoreEnd(thr, pc);
1062 ThreadJoin(thr, pc, tid);
1064 ThreadNotJoined(thr, pc, tid, (uptr)th);
1068 TSAN_INTERCEPTOR(int, pthread_timedjoin_np, void *th, void **ret,
1069 const struct timespec *abstime) {
1070 SCOPED_TSAN_INTERCEPTOR(pthread_timedjoin_np, th, ret, abstime);
1071 int tid = ThreadTid(thr, pc, (uptr)th);
1072 ThreadIgnoreBegin(thr, pc);
1073 int res = BLOCK_REAL(pthread_timedjoin_np)(th, ret, abstime);
1074 ThreadIgnoreEnd(thr, pc);
1076 ThreadJoin(thr, pc, tid);
1078 ThreadNotJoined(thr, pc, tid, (uptr)th);
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
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).
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)
1108 atomic_uintptr_t *p = (atomic_uintptr_t*)c;
1109 uptr cond = atomic_load(p, memory_order_acquire);
1110 if (!force && cond != 0)
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))
1117 WRAP(free)(newcond);
1121 struct CondMutexUnlockCtx {
1122 ScopedInterceptor *si;
1128 static void cond_mutex_unlock(CondMutexUnlockCtx *arg) {
1129 // pthread_cond_wait interceptor has enabled async signal delivery
1130 // (see BlockingCall below). Disable async signals since we are running
1131 // tsan code. Also ScopedInterceptor and BlockingCall destructors won't run
1132 // since the thread is cancelled, so we have to manually execute them
1133 // (the thread still can run some user code due to pthread_cleanup_push).
1134 ThreadSignalContext *ctx = SigCtx(arg->thr);
1135 CHECK_EQ(atomic_load(&ctx->in_blocking_func, memory_order_relaxed), 1);
1136 atomic_store(&ctx->in_blocking_func, 0, memory_order_relaxed);
1137 MutexPostLock(arg->thr, arg->pc, (uptr)arg->m, MutexFlagDoPreLockOnPostLock);
1138 // Undo BlockingCall ctor effects.
1139 arg->thr->ignore_interceptors--;
1140 arg->si->~ScopedInterceptor();
1143 INTERCEPTOR(int, pthread_cond_init, void *c, void *a) {
1144 void *cond = init_cond(c, true);
1145 SCOPED_TSAN_INTERCEPTOR(pthread_cond_init, cond, a);
1146 MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), true);
1147 return REAL(pthread_cond_init)(cond, a);
1150 static int cond_wait(ThreadState *thr, uptr pc, ScopedInterceptor *si,
1151 int (*fn)(void *c, void *m, void *abstime), void *c,
1153 MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), false);
1154 MutexUnlock(thr, pc, (uptr)m);
1155 CondMutexUnlockCtx arg = {si, thr, pc, m};
1157 // This ensures that we handle mutex lock even in case of pthread_cancel.
1158 // See test/tsan/cond_cancel.cc.
1160 // Enable signal delivery while the thread is blocked.
1161 BlockingCall bc(thr);
1162 res = call_pthread_cancel_with_cleanup(
1163 fn, c, m, t, (void (*)(void *arg))cond_mutex_unlock, &arg);
1165 if (res == errno_EOWNERDEAD) MutexRepair(thr, pc, (uptr)m);
1166 MutexPostLock(thr, pc, (uptr)m, MutexFlagDoPreLockOnPostLock);
1170 INTERCEPTOR(int, pthread_cond_wait, void *c, void *m) {
1171 void *cond = init_cond(c);
1172 SCOPED_TSAN_INTERCEPTOR(pthread_cond_wait, cond, m);
1173 return cond_wait(thr, pc, &si, (int (*)(void *c, void *m, void *abstime))REAL(
1178 INTERCEPTOR(int, pthread_cond_timedwait, void *c, void *m, void *abstime) {
1179 void *cond = init_cond(c);
1180 SCOPED_TSAN_INTERCEPTOR(pthread_cond_timedwait, cond, m, abstime);
1181 return cond_wait(thr, pc, &si, REAL(pthread_cond_timedwait), cond, m,
1186 INTERCEPTOR(int, pthread_cond_timedwait_relative_np, void *c, void *m,
1188 void *cond = init_cond(c);
1189 SCOPED_TSAN_INTERCEPTOR(pthread_cond_timedwait_relative_np, cond, m, reltime);
1190 return cond_wait(thr, pc, &si, REAL(pthread_cond_timedwait_relative_np), cond,
1195 INTERCEPTOR(int, pthread_cond_signal, void *c) {
1196 void *cond = init_cond(c);
1197 SCOPED_TSAN_INTERCEPTOR(pthread_cond_signal, cond);
1198 MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), false);
1199 return REAL(pthread_cond_signal)(cond);
1202 INTERCEPTOR(int, pthread_cond_broadcast, void *c) {
1203 void *cond = init_cond(c);
1204 SCOPED_TSAN_INTERCEPTOR(pthread_cond_broadcast, cond);
1205 MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), false);
1206 return REAL(pthread_cond_broadcast)(cond);
1209 INTERCEPTOR(int, pthread_cond_destroy, void *c) {
1210 void *cond = init_cond(c);
1211 SCOPED_TSAN_INTERCEPTOR(pthread_cond_destroy, cond);
1212 MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), true);
1213 int res = REAL(pthread_cond_destroy)(cond);
1214 if (common_flags()->legacy_pthread_cond) {
1215 // Free our aux cond and zero the pointer to not leave dangling pointers.
1217 atomic_store((atomic_uintptr_t*)c, 0, memory_order_relaxed);
1222 TSAN_INTERCEPTOR(int, pthread_mutex_init, void *m, void *a) {
1223 SCOPED_TSAN_INTERCEPTOR(pthread_mutex_init, m, a);
1224 int res = REAL(pthread_mutex_init)(m, a);
1229 if (REAL(pthread_mutexattr_gettype)(a, &type) == 0)
1230 if (type == PTHREAD_MUTEX_RECURSIVE ||
1231 type == PTHREAD_MUTEX_RECURSIVE_NP)
1232 flagz |= MutexFlagWriteReentrant;
1234 MutexCreate(thr, pc, (uptr)m, flagz);
1239 TSAN_INTERCEPTOR(int, pthread_mutex_destroy, void *m) {
1240 SCOPED_TSAN_INTERCEPTOR(pthread_mutex_destroy, m);
1241 int res = REAL(pthread_mutex_destroy)(m);
1242 if (res == 0 || res == errno_EBUSY) {
1243 MutexDestroy(thr, pc, (uptr)m);
1248 TSAN_INTERCEPTOR(int, pthread_mutex_trylock, void *m) {
1249 SCOPED_TSAN_INTERCEPTOR(pthread_mutex_trylock, m);
1250 int res = REAL(pthread_mutex_trylock)(m);
1251 if (res == errno_EOWNERDEAD)
1252 MutexRepair(thr, pc, (uptr)m);
1253 if (res == 0 || res == errno_EOWNERDEAD)
1254 MutexPostLock(thr, pc, (uptr)m, MutexFlagTryLock);
1259 TSAN_INTERCEPTOR(int, pthread_mutex_timedlock, void *m, void *abstime) {
1260 SCOPED_TSAN_INTERCEPTOR(pthread_mutex_timedlock, m, abstime);
1261 int res = REAL(pthread_mutex_timedlock)(m, abstime);
1263 MutexPostLock(thr, pc, (uptr)m, MutexFlagTryLock);
1270 TSAN_INTERCEPTOR(int, pthread_spin_init, void *m, int pshared) {
1271 SCOPED_TSAN_INTERCEPTOR(pthread_spin_init, m, pshared);
1272 int res = REAL(pthread_spin_init)(m, pshared);
1274 MutexCreate(thr, pc, (uptr)m);
1279 TSAN_INTERCEPTOR(int, pthread_spin_destroy, void *m) {
1280 SCOPED_TSAN_INTERCEPTOR(pthread_spin_destroy, m);
1281 int res = REAL(pthread_spin_destroy)(m);
1283 MutexDestroy(thr, pc, (uptr)m);
1288 TSAN_INTERCEPTOR(int, pthread_spin_lock, void *m) {
1289 SCOPED_TSAN_INTERCEPTOR(pthread_spin_lock, m);
1290 MutexPreLock(thr, pc, (uptr)m);
1291 int res = REAL(pthread_spin_lock)(m);
1293 MutexPostLock(thr, pc, (uptr)m);
1298 TSAN_INTERCEPTOR(int, pthread_spin_trylock, void *m) {
1299 SCOPED_TSAN_INTERCEPTOR(pthread_spin_trylock, m);
1300 int res = REAL(pthread_spin_trylock)(m);
1302 MutexPostLock(thr, pc, (uptr)m, MutexFlagTryLock);
1307 TSAN_INTERCEPTOR(int, pthread_spin_unlock, void *m) {
1308 SCOPED_TSAN_INTERCEPTOR(pthread_spin_unlock, m);
1309 MutexUnlock(thr, pc, (uptr)m);
1310 int res = REAL(pthread_spin_unlock)(m);
1315 TSAN_INTERCEPTOR(int, pthread_rwlock_init, void *m, void *a) {
1316 SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_init, m, a);
1317 int res = REAL(pthread_rwlock_init)(m, a);
1319 MutexCreate(thr, pc, (uptr)m);
1324 TSAN_INTERCEPTOR(int, pthread_rwlock_destroy, void *m) {
1325 SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_destroy, m);
1326 int res = REAL(pthread_rwlock_destroy)(m);
1328 MutexDestroy(thr, pc, (uptr)m);
1333 TSAN_INTERCEPTOR(int, pthread_rwlock_rdlock, void *m) {
1334 SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_rdlock, m);
1335 MutexPreReadLock(thr, pc, (uptr)m);
1336 int res = REAL(pthread_rwlock_rdlock)(m);
1338 MutexPostReadLock(thr, pc, (uptr)m);
1343 TSAN_INTERCEPTOR(int, pthread_rwlock_tryrdlock, void *m) {
1344 SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_tryrdlock, m);
1345 int res = REAL(pthread_rwlock_tryrdlock)(m);
1347 MutexPostReadLock(thr, pc, (uptr)m, MutexFlagTryLock);
1353 TSAN_INTERCEPTOR(int, pthread_rwlock_timedrdlock, void *m, void *abstime) {
1354 SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedrdlock, m, abstime);
1355 int res = REAL(pthread_rwlock_timedrdlock)(m, abstime);
1357 MutexPostReadLock(thr, pc, (uptr)m);
1363 TSAN_INTERCEPTOR(int, pthread_rwlock_wrlock, void *m) {
1364 SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_wrlock, m);
1365 MutexPreLock(thr, pc, (uptr)m);
1366 int res = REAL(pthread_rwlock_wrlock)(m);
1368 MutexPostLock(thr, pc, (uptr)m);
1373 TSAN_INTERCEPTOR(int, pthread_rwlock_trywrlock, void *m) {
1374 SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_trywrlock, m);
1375 int res = REAL(pthread_rwlock_trywrlock)(m);
1377 MutexPostLock(thr, pc, (uptr)m, MutexFlagTryLock);
1383 TSAN_INTERCEPTOR(int, pthread_rwlock_timedwrlock, void *m, void *abstime) {
1384 SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedwrlock, m, abstime);
1385 int res = REAL(pthread_rwlock_timedwrlock)(m, abstime);
1387 MutexPostLock(thr, pc, (uptr)m, MutexFlagTryLock);
1393 TSAN_INTERCEPTOR(int, pthread_rwlock_unlock, void *m) {
1394 SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_unlock, m);
1395 MutexReadOrWriteUnlock(thr, pc, (uptr)m);
1396 int res = REAL(pthread_rwlock_unlock)(m);
1401 TSAN_INTERCEPTOR(int, pthread_barrier_init, void *b, void *a, unsigned count) {
1402 SCOPED_TSAN_INTERCEPTOR(pthread_barrier_init, b, a, count);
1403 MemoryWrite(thr, pc, (uptr)b, kSizeLog1);
1404 int res = REAL(pthread_barrier_init)(b, a, count);
1408 TSAN_INTERCEPTOR(int, pthread_barrier_destroy, void *b) {
1409 SCOPED_TSAN_INTERCEPTOR(pthread_barrier_destroy, b);
1410 MemoryWrite(thr, pc, (uptr)b, kSizeLog1);
1411 int res = REAL(pthread_barrier_destroy)(b);
1415 TSAN_INTERCEPTOR(int, pthread_barrier_wait, void *b) {
1416 SCOPED_TSAN_INTERCEPTOR(pthread_barrier_wait, b);
1417 Release(thr, pc, (uptr)b);
1418 MemoryRead(thr, pc, (uptr)b, kSizeLog1);
1419 int res = REAL(pthread_barrier_wait)(b);
1420 MemoryRead(thr, pc, (uptr)b, kSizeLog1);
1421 if (res == 0 || res == PTHREAD_BARRIER_SERIAL_THREAD) {
1422 Acquire(thr, pc, (uptr)b);
1428 TSAN_INTERCEPTOR(int, pthread_once, void *o, void (*f)()) {
1429 SCOPED_INTERCEPTOR_RAW(pthread_once, o, f);
1430 if (o == 0 || f == 0)
1431 return errno_EINVAL;
1435 a = static_cast<atomic_uint32_t*>((void *)((char *)o + sizeof(long_t)));
1436 else if (SANITIZER_NETBSD)
1437 a = static_cast<atomic_uint32_t*>
1438 ((void *)((char *)o + __sanitizer::pthread_mutex_t_sz));
1440 a = static_cast<atomic_uint32_t*>(o);
1442 u32 v = atomic_load(a, memory_order_acquire);
1443 if (v == 0 && atomic_compare_exchange_strong(a, &v, 1,
1444 memory_order_relaxed)) {
1446 if (!thr->in_ignored_lib)
1447 Release(thr, pc, (uptr)o);
1448 atomic_store(a, 2, memory_order_release);
1451 internal_sched_yield();
1452 v = atomic_load(a, memory_order_acquire);
1454 if (!thr->in_ignored_lib)
1455 Acquire(thr, pc, (uptr)o);
1460 #if SANITIZER_LINUX && !SANITIZER_ANDROID
1461 TSAN_INTERCEPTOR(int, __fxstat, int version, int fd, void *buf) {
1462 SCOPED_TSAN_INTERCEPTOR(__fxstat, version, fd, buf);
1464 FdAccess(thr, pc, fd);
1465 return REAL(__fxstat)(version, fd, buf);
1467 #define TSAN_MAYBE_INTERCEPT___FXSTAT TSAN_INTERCEPT(__fxstat)
1469 #define TSAN_MAYBE_INTERCEPT___FXSTAT
1472 TSAN_INTERCEPTOR(int, fstat, int fd, void *buf) {
1473 #if SANITIZER_FREEBSD || SANITIZER_MAC || SANITIZER_ANDROID || SANITIZER_NETBSD
1474 SCOPED_TSAN_INTERCEPTOR(fstat, fd, buf);
1476 FdAccess(thr, pc, fd);
1477 return REAL(fstat)(fd, buf);
1479 SCOPED_TSAN_INTERCEPTOR(__fxstat, 0, fd, buf);
1481 FdAccess(thr, pc, fd);
1482 return REAL(__fxstat)(0, fd, buf);
1486 #if SANITIZER_LINUX && !SANITIZER_ANDROID
1487 TSAN_INTERCEPTOR(int, __fxstat64, int version, int fd, void *buf) {
1488 SCOPED_TSAN_INTERCEPTOR(__fxstat64, version, fd, buf);
1490 FdAccess(thr, pc, fd);
1491 return REAL(__fxstat64)(version, fd, buf);
1493 #define TSAN_MAYBE_INTERCEPT___FXSTAT64 TSAN_INTERCEPT(__fxstat64)
1495 #define TSAN_MAYBE_INTERCEPT___FXSTAT64
1498 #if SANITIZER_LINUX && !SANITIZER_ANDROID
1499 TSAN_INTERCEPTOR(int, fstat64, int fd, void *buf) {
1500 SCOPED_TSAN_INTERCEPTOR(__fxstat64, 0, fd, buf);
1502 FdAccess(thr, pc, fd);
1503 return REAL(__fxstat64)(0, fd, buf);
1505 #define TSAN_MAYBE_INTERCEPT_FSTAT64 TSAN_INTERCEPT(fstat64)
1507 #define TSAN_MAYBE_INTERCEPT_FSTAT64
1510 TSAN_INTERCEPTOR(int, open, const char *name, int flags, int mode) {
1511 SCOPED_TSAN_INTERCEPTOR(open, name, flags, mode);
1512 READ_STRING(thr, pc, name, 0);
1513 int fd = REAL(open)(name, flags, mode);
1515 FdFileCreate(thr, pc, fd);
1520 TSAN_INTERCEPTOR(int, open64, const char *name, int flags, int mode) {
1521 SCOPED_TSAN_INTERCEPTOR(open64, name, flags, mode);
1522 READ_STRING(thr, pc, name, 0);
1523 int fd = REAL(open64)(name, flags, mode);
1525 FdFileCreate(thr, pc, fd);
1528 #define TSAN_MAYBE_INTERCEPT_OPEN64 TSAN_INTERCEPT(open64)
1530 #define TSAN_MAYBE_INTERCEPT_OPEN64
1533 TSAN_INTERCEPTOR(int, creat, const char *name, int mode) {
1534 SCOPED_TSAN_INTERCEPTOR(creat, name, mode);
1535 READ_STRING(thr, pc, name, 0);
1536 int fd = REAL(creat)(name, mode);
1538 FdFileCreate(thr, pc, fd);
1543 TSAN_INTERCEPTOR(int, creat64, const char *name, int mode) {
1544 SCOPED_TSAN_INTERCEPTOR(creat64, name, mode);
1545 READ_STRING(thr, pc, name, 0);
1546 int fd = REAL(creat64)(name, mode);
1548 FdFileCreate(thr, pc, fd);
1551 #define TSAN_MAYBE_INTERCEPT_CREAT64 TSAN_INTERCEPT(creat64)
1553 #define TSAN_MAYBE_INTERCEPT_CREAT64
1556 TSAN_INTERCEPTOR(int, dup, int oldfd) {
1557 SCOPED_TSAN_INTERCEPTOR(dup, oldfd);
1558 int newfd = REAL(dup)(oldfd);
1559 if (oldfd >= 0 && newfd >= 0 && newfd != oldfd)
1560 FdDup(thr, pc, oldfd, newfd, true);
1564 TSAN_INTERCEPTOR(int, dup2, int oldfd, int newfd) {
1565 SCOPED_TSAN_INTERCEPTOR(dup2, oldfd, newfd);
1566 int newfd2 = REAL(dup2)(oldfd, newfd);
1567 if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
1568 FdDup(thr, pc, oldfd, newfd2, false);
1573 TSAN_INTERCEPTOR(int, dup3, int oldfd, int newfd, int flags) {
1574 SCOPED_TSAN_INTERCEPTOR(dup3, oldfd, newfd, flags);
1575 int newfd2 = REAL(dup3)(oldfd, newfd, flags);
1576 if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
1577 FdDup(thr, pc, oldfd, newfd2, false);
1583 TSAN_INTERCEPTOR(int, eventfd, unsigned initval, int flags) {
1584 SCOPED_TSAN_INTERCEPTOR(eventfd, initval, flags);
1585 int fd = REAL(eventfd)(initval, flags);
1587 FdEventCreate(thr, pc, fd);
1590 #define TSAN_MAYBE_INTERCEPT_EVENTFD TSAN_INTERCEPT(eventfd)
1592 #define TSAN_MAYBE_INTERCEPT_EVENTFD
1596 TSAN_INTERCEPTOR(int, signalfd, int fd, void *mask, int flags) {
1597 SCOPED_TSAN_INTERCEPTOR(signalfd, fd, mask, flags);
1599 FdClose(thr, pc, fd);
1600 fd = REAL(signalfd)(fd, mask, flags);
1602 FdSignalCreate(thr, pc, fd);
1605 #define TSAN_MAYBE_INTERCEPT_SIGNALFD TSAN_INTERCEPT(signalfd)
1607 #define TSAN_MAYBE_INTERCEPT_SIGNALFD
1611 TSAN_INTERCEPTOR(int, inotify_init, int fake) {
1612 SCOPED_TSAN_INTERCEPTOR(inotify_init, fake);
1613 int fd = REAL(inotify_init)(fake);
1615 FdInotifyCreate(thr, pc, fd);
1618 #define TSAN_MAYBE_INTERCEPT_INOTIFY_INIT TSAN_INTERCEPT(inotify_init)
1620 #define TSAN_MAYBE_INTERCEPT_INOTIFY_INIT
1624 TSAN_INTERCEPTOR(int, inotify_init1, int flags) {
1625 SCOPED_TSAN_INTERCEPTOR(inotify_init1, flags);
1626 int fd = REAL(inotify_init1)(flags);
1628 FdInotifyCreate(thr, pc, fd);
1631 #define TSAN_MAYBE_INTERCEPT_INOTIFY_INIT1 TSAN_INTERCEPT(inotify_init1)
1633 #define TSAN_MAYBE_INTERCEPT_INOTIFY_INIT1
1636 TSAN_INTERCEPTOR(int, socket, int domain, int type, int protocol) {
1637 SCOPED_TSAN_INTERCEPTOR(socket, domain, type, protocol);
1638 int fd = REAL(socket)(domain, type, protocol);
1640 FdSocketCreate(thr, pc, fd);
1644 TSAN_INTERCEPTOR(int, socketpair, int domain, int type, int protocol, int *fd) {
1645 SCOPED_TSAN_INTERCEPTOR(socketpair, domain, type, protocol, fd);
1646 int res = REAL(socketpair)(domain, type, protocol, fd);
1647 if (res == 0 && fd[0] >= 0 && fd[1] >= 0)
1648 FdPipeCreate(thr, pc, fd[0], fd[1]);
1652 TSAN_INTERCEPTOR(int, connect, int fd, void *addr, unsigned addrlen) {
1653 SCOPED_TSAN_INTERCEPTOR(connect, fd, addr, addrlen);
1654 FdSocketConnecting(thr, pc, fd);
1655 int res = REAL(connect)(fd, addr, addrlen);
1656 if (res == 0 && fd >= 0)
1657 FdSocketConnect(thr, pc, fd);
1661 TSAN_INTERCEPTOR(int, bind, int fd, void *addr, unsigned addrlen) {
1662 SCOPED_TSAN_INTERCEPTOR(bind, fd, addr, addrlen);
1663 int res = REAL(bind)(fd, addr, addrlen);
1664 if (fd > 0 && res == 0)
1665 FdAccess(thr, pc, fd);
1669 TSAN_INTERCEPTOR(int, listen, int fd, int backlog) {
1670 SCOPED_TSAN_INTERCEPTOR(listen, fd, backlog);
1671 int res = REAL(listen)(fd, backlog);
1672 if (fd > 0 && res == 0)
1673 FdAccess(thr, pc, fd);
1677 TSAN_INTERCEPTOR(int, close, int fd) {
1678 SCOPED_TSAN_INTERCEPTOR(close, fd);
1680 FdClose(thr, pc, fd);
1681 return REAL(close)(fd);
1685 TSAN_INTERCEPTOR(int, __close, int fd) {
1686 SCOPED_TSAN_INTERCEPTOR(__close, fd);
1688 FdClose(thr, pc, fd);
1689 return REAL(__close)(fd);
1691 #define TSAN_MAYBE_INTERCEPT___CLOSE TSAN_INTERCEPT(__close)
1693 #define TSAN_MAYBE_INTERCEPT___CLOSE
1697 #if SANITIZER_LINUX && !SANITIZER_ANDROID
1698 TSAN_INTERCEPTOR(void, __res_iclose, void *state, bool free_addr) {
1699 SCOPED_TSAN_INTERCEPTOR(__res_iclose, state, free_addr);
1701 int cnt = ExtractResolvFDs(state, fds, ARRAY_SIZE(fds));
1702 for (int i = 0; i < cnt; i++) {
1704 FdClose(thr, pc, fds[i]);
1706 REAL(__res_iclose)(state, free_addr);
1708 #define TSAN_MAYBE_INTERCEPT___RES_ICLOSE TSAN_INTERCEPT(__res_iclose)
1710 #define TSAN_MAYBE_INTERCEPT___RES_ICLOSE
1713 TSAN_INTERCEPTOR(int, pipe, int *pipefd) {
1714 SCOPED_TSAN_INTERCEPTOR(pipe, pipefd);
1715 int res = REAL(pipe)(pipefd);
1716 if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
1717 FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
1722 TSAN_INTERCEPTOR(int, pipe2, int *pipefd, int flags) {
1723 SCOPED_TSAN_INTERCEPTOR(pipe2, pipefd, flags);
1724 int res = REAL(pipe2)(pipefd, flags);
1725 if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
1726 FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
1731 TSAN_INTERCEPTOR(int, unlink, char *path) {
1732 SCOPED_TSAN_INTERCEPTOR(unlink, path);
1733 Release(thr, pc, File2addr(path));
1734 int res = REAL(unlink)(path);
1738 TSAN_INTERCEPTOR(void*, tmpfile, int fake) {
1739 SCOPED_TSAN_INTERCEPTOR(tmpfile, fake);
1740 void *res = REAL(tmpfile)(fake);
1742 int fd = fileno_unlocked(res);
1744 FdFileCreate(thr, pc, fd);
1750 TSAN_INTERCEPTOR(void*, tmpfile64, int fake) {
1751 SCOPED_TSAN_INTERCEPTOR(tmpfile64, fake);
1752 void *res = REAL(tmpfile64)(fake);
1754 int fd = fileno_unlocked(res);
1756 FdFileCreate(thr, pc, fd);
1760 #define TSAN_MAYBE_INTERCEPT_TMPFILE64 TSAN_INTERCEPT(tmpfile64)
1762 #define TSAN_MAYBE_INTERCEPT_TMPFILE64
1765 static void FlushStreams() {
1766 // Flushing all the streams here may freeze the process if a child thread is
1767 // performing file stream operations at the same time.
1768 REAL(fflush)(stdout);
1769 REAL(fflush)(stderr);
1772 TSAN_INTERCEPTOR(void, abort, int fake) {
1773 SCOPED_TSAN_INTERCEPTOR(abort, fake);
1778 TSAN_INTERCEPTOR(int, rmdir, char *path) {
1779 SCOPED_TSAN_INTERCEPTOR(rmdir, path);
1780 Release(thr, pc, Dir2addr(path));
1781 int res = REAL(rmdir)(path);
1785 TSAN_INTERCEPTOR(int, closedir, void *dirp) {
1786 SCOPED_TSAN_INTERCEPTOR(closedir, dirp);
1788 int fd = dirfd(dirp);
1789 FdClose(thr, pc, fd);
1791 return REAL(closedir)(dirp);
1795 TSAN_INTERCEPTOR(int, epoll_create, int size) {
1796 SCOPED_TSAN_INTERCEPTOR(epoll_create, size);
1797 int fd = REAL(epoll_create)(size);
1799 FdPollCreate(thr, pc, fd);
1803 TSAN_INTERCEPTOR(int, epoll_create1, int flags) {
1804 SCOPED_TSAN_INTERCEPTOR(epoll_create1, flags);
1805 int fd = REAL(epoll_create1)(flags);
1807 FdPollCreate(thr, pc, fd);
1811 TSAN_INTERCEPTOR(int, epoll_ctl, int epfd, int op, int fd, void *ev) {
1812 SCOPED_TSAN_INTERCEPTOR(epoll_ctl, epfd, op, fd, ev);
1814 FdAccess(thr, pc, epfd);
1815 if (epfd >= 0 && fd >= 0)
1816 FdAccess(thr, pc, fd);
1817 if (op == EPOLL_CTL_ADD && epfd >= 0)
1818 FdRelease(thr, pc, epfd);
1819 int res = REAL(epoll_ctl)(epfd, op, fd, ev);
1823 TSAN_INTERCEPTOR(int, epoll_wait, int epfd, void *ev, int cnt, int timeout) {
1824 SCOPED_TSAN_INTERCEPTOR(epoll_wait, epfd, ev, cnt, timeout);
1826 FdAccess(thr, pc, epfd);
1827 int res = BLOCK_REAL(epoll_wait)(epfd, ev, cnt, timeout);
1828 if (res > 0 && epfd >= 0)
1829 FdAcquire(thr, pc, epfd);
1833 TSAN_INTERCEPTOR(int, epoll_pwait, int epfd, void *ev, int cnt, int timeout,
1835 SCOPED_TSAN_INTERCEPTOR(epoll_pwait, epfd, ev, cnt, timeout, sigmask);
1837 FdAccess(thr, pc, epfd);
1838 int res = BLOCK_REAL(epoll_pwait)(epfd, ev, cnt, timeout, sigmask);
1839 if (res > 0 && epfd >= 0)
1840 FdAcquire(thr, pc, epfd);
1844 #define TSAN_MAYBE_INTERCEPT_EPOLL \
1845 TSAN_INTERCEPT(epoll_create); \
1846 TSAN_INTERCEPT(epoll_create1); \
1847 TSAN_INTERCEPT(epoll_ctl); \
1848 TSAN_INTERCEPT(epoll_wait); \
1849 TSAN_INTERCEPT(epoll_pwait)
1851 #define TSAN_MAYBE_INTERCEPT_EPOLL
1854 // The following functions are intercepted merely to process pending signals.
1855 // If program blocks signal X, we must deliver the signal before the function
1856 // returns. Similarly, if program unblocks a signal (or returns from sigsuspend)
1857 // it's better to deliver the signal straight away.
1858 TSAN_INTERCEPTOR(int, sigsuspend, const __sanitizer_sigset_t *mask) {
1859 SCOPED_TSAN_INTERCEPTOR(sigsuspend, mask);
1860 return REAL(sigsuspend)(mask);
1863 TSAN_INTERCEPTOR(int, sigblock, int mask) {
1864 SCOPED_TSAN_INTERCEPTOR(sigblock, mask);
1865 return REAL(sigblock)(mask);
1868 TSAN_INTERCEPTOR(int, sigsetmask, int mask) {
1869 SCOPED_TSAN_INTERCEPTOR(sigsetmask, mask);
1870 return REAL(sigsetmask)(mask);
1873 TSAN_INTERCEPTOR(int, pthread_sigmask, int how, const __sanitizer_sigset_t *set,
1874 __sanitizer_sigset_t *oldset) {
1875 SCOPED_TSAN_INTERCEPTOR(pthread_sigmask, how, set, oldset);
1876 return REAL(pthread_sigmask)(how, set, oldset);
1881 static void CallUserSignalHandler(ThreadState *thr, bool sync, bool acquire,
1882 bool sigact, int sig,
1883 __sanitizer_siginfo *info, void *uctx) {
1884 __sanitizer_sigaction *sigactions = interceptor_ctx()->sigactions;
1886 Acquire(thr, 0, (uptr)&sigactions[sig]);
1887 // Signals are generally asynchronous, so if we receive a signals when
1888 // ignores are enabled we should disable ignores. This is critical for sync
1889 // and interceptors, because otherwise we can miss syncronization and report
1891 int ignore_reads_and_writes = thr->ignore_reads_and_writes;
1892 int ignore_interceptors = thr->ignore_interceptors;
1893 int ignore_sync = thr->ignore_sync;
1894 if (!ctx->after_multithreaded_fork) {
1895 thr->ignore_reads_and_writes = 0;
1896 thr->fast_state.ClearIgnoreBit();
1897 thr->ignore_interceptors = 0;
1898 thr->ignore_sync = 0;
1900 // Ensure that the handler does not spoil errno.
1901 const int saved_errno = errno;
1903 // This code races with sigaction. Be careful to not read sa_sigaction twice.
1904 // Also need to remember pc for reporting before the call,
1905 // because the handler can reset it.
1907 sigact ? (uptr)sigactions[sig].sigaction : (uptr)sigactions[sig].handler;
1908 if (pc != sig_dfl && pc != sig_ign) {
1910 ((__sanitizer_sigactionhandler_ptr)pc)(sig, info, uctx);
1912 ((__sanitizer_sighandler_ptr)pc)(sig);
1914 if (!ctx->after_multithreaded_fork) {
1915 thr->ignore_reads_and_writes = ignore_reads_and_writes;
1916 if (ignore_reads_and_writes)
1917 thr->fast_state.SetIgnoreBit();
1918 thr->ignore_interceptors = ignore_interceptors;
1919 thr->ignore_sync = ignore_sync;
1921 // We do not detect errno spoiling for SIGTERM,
1922 // because some SIGTERM handlers do spoil errno but reraise SIGTERM,
1923 // tsan reports false positive in such case.
1924 // It's difficult to properly detect this situation (reraise),
1925 // because in async signal processing case (when handler is called directly
1926 // from rtl_generic_sighandler) we have not yet received the reraised
1927 // signal; and it looks too fragile to intercept all ways to reraise a signal.
1928 if (flags()->report_bugs && !sync && sig != SIGTERM && errno != 99) {
1929 VarSizeStackTrace stack;
1930 // StackTrace::GetNestInstructionPc(pc) is used because return address is
1931 // expected, OutputReport() will undo this.
1932 ObtainCurrentStack(thr, StackTrace::GetNextInstructionPc(pc), &stack);
1933 ThreadRegistryLock l(ctx->thread_registry);
1934 ScopedReport rep(ReportTypeErrnoInSignal);
1935 if (!IsFiredSuppression(ctx, ReportTypeErrnoInSignal, stack)) {
1936 rep.AddStack(stack, true);
1937 OutputReport(thr, rep);
1940 errno = saved_errno;
1943 void ProcessPendingSignals(ThreadState *thr) {
1944 ThreadSignalContext *sctx = SigCtx(thr);
1946 atomic_load(&sctx->have_pending_signals, memory_order_relaxed) == 0)
1948 atomic_store(&sctx->have_pending_signals, 0, memory_order_relaxed);
1949 atomic_fetch_add(&thr->in_signal_handler, 1, memory_order_relaxed);
1950 internal_sigfillset(&sctx->emptyset);
1951 int res = REAL(pthread_sigmask)(SIG_SETMASK, &sctx->emptyset, &sctx->oldset);
1953 for (int sig = 0; sig < kSigCount; sig++) {
1954 SignalDesc *signal = &sctx->pending_signals[sig];
1955 if (signal->armed) {
1956 signal->armed = false;
1957 CallUserSignalHandler(thr, false, true, signal->sigaction, sig,
1958 &signal->siginfo, &signal->ctx);
1961 res = REAL(pthread_sigmask)(SIG_SETMASK, &sctx->oldset, 0);
1963 atomic_fetch_add(&thr->in_signal_handler, -1, memory_order_relaxed);
1966 } // namespace __tsan
1968 static bool is_sync_signal(ThreadSignalContext *sctx, int sig) {
1969 return sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
1970 sig == SIGABRT || sig == SIGFPE || sig == SIGPIPE || sig == SIGSYS ||
1971 // If we are sending signal to ourselves, we must process it now.
1972 (sctx && sig == sctx->int_signal_send);
1975 void ALWAYS_INLINE rtl_generic_sighandler(bool sigact, int sig,
1976 __sanitizer_siginfo *info,
1978 ThreadState *thr = cur_thread();
1979 ThreadSignalContext *sctx = SigCtx(thr);
1980 if (sig < 0 || sig >= kSigCount) {
1981 VPrintf(1, "ThreadSanitizer: ignoring signal %d\n", sig);
1984 // Don't mess with synchronous signals.
1985 const bool sync = is_sync_signal(sctx, sig);
1987 // If we are in blocking function, we can safely process it now
1988 // (but check if we are in a recursive interceptor,
1989 // i.e. pthread_join()->munmap()).
1990 (sctx && atomic_load(&sctx->in_blocking_func, memory_order_relaxed))) {
1991 atomic_fetch_add(&thr->in_signal_handler, 1, memory_order_relaxed);
1992 if (sctx && atomic_load(&sctx->in_blocking_func, memory_order_relaxed)) {
1993 atomic_store(&sctx->in_blocking_func, 0, memory_order_relaxed);
1994 CallUserSignalHandler(thr, sync, true, sigact, sig, info, ctx);
1995 atomic_store(&sctx->in_blocking_func, 1, memory_order_relaxed);
1997 // Be very conservative with when we do acquire in this case.
1998 // It's unsafe to do acquire in async handlers, because ThreadState
1999 // can be in inconsistent state.
2000 // SIGSYS looks relatively safe -- it's synchronous and can actually
2001 // need some global state.
2002 bool acq = (sig == SIGSYS);
2003 CallUserSignalHandler(thr, sync, acq, sigact, sig, info, ctx);
2005 atomic_fetch_add(&thr->in_signal_handler, -1, memory_order_relaxed);
2011 SignalDesc *signal = &sctx->pending_signals[sig];
2012 if (signal->armed == false) {
2013 signal->armed = true;
2014 signal->sigaction = sigact;
2016 internal_memcpy(&signal->siginfo, info, sizeof(*info));
2018 internal_memcpy(&signal->ctx, ctx, sizeof(signal->ctx));
2019 atomic_store(&sctx->have_pending_signals, 1, memory_order_relaxed);
2023 static void rtl_sighandler(int sig) {
2024 rtl_generic_sighandler(false, sig, 0, 0);
2027 static void rtl_sigaction(int sig, __sanitizer_siginfo *info, void *ctx) {
2028 rtl_generic_sighandler(true, sig, info, ctx);
2031 TSAN_INTERCEPTOR(int, raise, int sig) {
2032 SCOPED_TSAN_INTERCEPTOR(raise, sig);
2033 ThreadSignalContext *sctx = SigCtx(thr);
2035 int prev = sctx->int_signal_send;
2036 sctx->int_signal_send = sig;
2037 int res = REAL(raise)(sig);
2038 CHECK_EQ(sctx->int_signal_send, sig);
2039 sctx->int_signal_send = prev;
2043 TSAN_INTERCEPTOR(int, kill, int pid, int sig) {
2044 SCOPED_TSAN_INTERCEPTOR(kill, pid, sig);
2045 ThreadSignalContext *sctx = SigCtx(thr);
2047 int prev = sctx->int_signal_send;
2048 if (pid == (int)internal_getpid()) {
2049 sctx->int_signal_send = sig;
2051 int res = REAL(kill)(pid, sig);
2052 if (pid == (int)internal_getpid()) {
2053 CHECK_EQ(sctx->int_signal_send, sig);
2054 sctx->int_signal_send = prev;
2059 TSAN_INTERCEPTOR(int, pthread_kill, void *tid, int sig) {
2060 SCOPED_TSAN_INTERCEPTOR(pthread_kill, tid, sig);
2061 ThreadSignalContext *sctx = SigCtx(thr);
2063 int prev = sctx->int_signal_send;
2064 if (tid == pthread_self()) {
2065 sctx->int_signal_send = sig;
2067 int res = REAL(pthread_kill)(tid, sig);
2068 if (tid == pthread_self()) {
2069 CHECK_EQ(sctx->int_signal_send, sig);
2070 sctx->int_signal_send = prev;
2075 TSAN_INTERCEPTOR(int, gettimeofday, void *tv, void *tz) {
2076 SCOPED_TSAN_INTERCEPTOR(gettimeofday, tv, tz);
2077 // It's intercepted merely to process pending signals.
2078 return REAL(gettimeofday)(tv, tz);
2081 TSAN_INTERCEPTOR(int, getaddrinfo, void *node, void *service,
2082 void *hints, void *rv) {
2083 SCOPED_TSAN_INTERCEPTOR(getaddrinfo, node, service, hints, rv);
2084 // We miss atomic synchronization in getaddrinfo,
2085 // and can report false race between malloc and free
2086 // inside of getaddrinfo. So ignore memory accesses.
2087 ThreadIgnoreBegin(thr, pc);
2088 int res = REAL(getaddrinfo)(node, service, hints, rv);
2089 ThreadIgnoreEnd(thr, pc);
2093 TSAN_INTERCEPTOR(int, fork, int fake) {
2094 if (UNLIKELY(cur_thread()->in_symbolizer))
2095 return REAL(fork)(fake);
2096 SCOPED_INTERCEPTOR_RAW(fork, fake);
2097 ForkBefore(thr, pc);
2100 // On OS X, REAL(fork) can call intercepted functions (OSSpinLockLock), and
2101 // we'll assert in CheckNoLocks() unless we ignore interceptors.
2102 ScopedIgnoreInterceptors ignore;
2103 pid = REAL(fork)(fake);
2107 ForkChildAfter(thr, pc);
2109 } else if (pid > 0) {
2111 ForkParentAfter(thr, pc);
2114 ForkParentAfter(thr, pc);
2119 TSAN_INTERCEPTOR(int, vfork, int fake) {
2120 // Some programs (e.g. openjdk) call close for all file descriptors
2121 // in the child process. Under tsan it leads to false positives, because
2122 // address space is shared, so the parent process also thinks that
2123 // the descriptors are closed (while they are actually not).
2124 // This leads to false positives due to missed synchronization.
2125 // Strictly saying this is undefined behavior, because vfork child is not
2126 // allowed to call any functions other than exec/exit. But this is what
2127 // openjdk does, so we want to handle it.
2128 // We could disable interceptors in the child process. But it's not possible
2129 // to simply intercept and wrap vfork, because vfork child is not allowed
2130 // to return from the function that calls vfork, and that's exactly what
2131 // we would do. So this would require some assembly trickery as well.
2132 // Instead we simply turn vfork into fork.
2133 return WRAP(fork)(fake);
2136 #if !SANITIZER_MAC && !SANITIZER_ANDROID
2137 typedef int (*dl_iterate_phdr_cb_t)(__sanitizer_dl_phdr_info *info, SIZE_T size,
2139 struct dl_iterate_phdr_data {
2142 dl_iterate_phdr_cb_t cb;
2146 static bool IsAppNotRodata(uptr addr) {
2147 return IsAppMem(addr) && *(u64*)MemToShadow(addr) != kShadowRodata;
2150 static int dl_iterate_phdr_cb(__sanitizer_dl_phdr_info *info, SIZE_T size,
2152 dl_iterate_phdr_data *cbdata = (dl_iterate_phdr_data *)data;
2153 // dlopen/dlclose allocate/free dynamic-linker-internal memory, which is later
2154 // accessible in dl_iterate_phdr callback. But we don't see synchronization
2155 // inside of dynamic linker, so we "unpoison" it here in order to not
2156 // produce false reports. Ignoring malloc/free in dlopen/dlclose is not enough
2157 // because some libc functions call __libc_dlopen.
2158 if (info && IsAppNotRodata((uptr)info->dlpi_name))
2159 MemoryResetRange(cbdata->thr, cbdata->pc, (uptr)info->dlpi_name,
2160 internal_strlen(info->dlpi_name));
2161 int res = cbdata->cb(info, size, cbdata->data);
2162 // Perform the check one more time in case info->dlpi_name was overwritten
2163 // by user callback.
2164 if (info && IsAppNotRodata((uptr)info->dlpi_name))
2165 MemoryResetRange(cbdata->thr, cbdata->pc, (uptr)info->dlpi_name,
2166 internal_strlen(info->dlpi_name));
2170 TSAN_INTERCEPTOR(int, dl_iterate_phdr, dl_iterate_phdr_cb_t cb, void *data) {
2171 SCOPED_TSAN_INTERCEPTOR(dl_iterate_phdr, cb, data);
2172 dl_iterate_phdr_data cbdata;
2177 int res = REAL(dl_iterate_phdr)(dl_iterate_phdr_cb, &cbdata);
2182 static int OnExit(ThreadState *thr) {
2183 int status = Finalize(thr);
2188 struct TsanInterceptorContext {
2190 const uptr caller_pc;
2195 static void HandleRecvmsg(ThreadState *thr, uptr pc,
2196 __sanitizer_msghdr *msg) {
2198 int cnt = ExtractRecvmsgFDs(msg, fds, ARRAY_SIZE(fds));
2199 for (int i = 0; i < cnt; i++)
2200 FdEventCreate(thr, pc, fds[i]);
2204 #include "sanitizer_common/sanitizer_platform_interceptors.h"
2205 // Causes interceptor recursion (getaddrinfo() and fopen())
2206 #undef SANITIZER_INTERCEPT_GETADDRINFO
2207 // There interceptors do not seem to be strictly necessary for tsan.
2208 // But we see cases where the interceptors consume 70% of execution time.
2209 // Memory blocks passed to fgetgrent_r are "written to" by tsan several times.
2210 // First, there is some recursion (getgrnam_r calls fgetgrent_r), and each
2211 // function "writes to" the buffer. Then, the same memory is "written to"
2212 // twice, first as buf and then as pwbufp (both of them refer to the same
2214 #undef SANITIZER_INTERCEPT_GETPWENT
2215 #undef SANITIZER_INTERCEPT_GETPWENT_R
2216 #undef SANITIZER_INTERCEPT_FGETPWENT
2217 #undef SANITIZER_INTERCEPT_GETPWNAM_AND_FRIENDS
2218 #undef SANITIZER_INTERCEPT_GETPWNAM_R_AND_FRIENDS
2219 // We define our own.
2220 #if SANITIZER_INTERCEPT_TLS_GET_ADDR
2221 #define NEED_TLS_GET_ADDR
2223 #undef SANITIZER_INTERCEPT_TLS_GET_ADDR
2225 #define COMMON_INTERCEPT_FUNCTION(name) INTERCEPT_FUNCTION(name)
2226 #define COMMON_INTERCEPT_FUNCTION_VER(name, ver) \
2227 INTERCEPT_FUNCTION_VER(name, ver)
2229 #define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size) \
2230 MemoryAccessRange(((TsanInterceptorContext *)ctx)->thr, \
2231 ((TsanInterceptorContext *)ctx)->pc, (uptr)ptr, size, \
2234 #define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size) \
2235 MemoryAccessRange(((TsanInterceptorContext *) ctx)->thr, \
2236 ((TsanInterceptorContext *) ctx)->pc, (uptr) ptr, size, \
2239 #define COMMON_INTERCEPTOR_ENTER(ctx, func, ...) \
2240 SCOPED_TSAN_INTERCEPTOR(func, __VA_ARGS__); \
2241 TsanInterceptorContext _ctx = {thr, caller_pc, pc}; \
2242 ctx = (void *)&_ctx; \
2245 #define COMMON_INTERCEPTOR_ENTER_NOIGNORE(ctx, func, ...) \
2246 SCOPED_INTERCEPTOR_RAW(func, __VA_ARGS__); \
2247 TsanInterceptorContext _ctx = {thr, caller_pc, pc}; \
2248 ctx = (void *)&_ctx; \
2251 #define COMMON_INTERCEPTOR_FILE_OPEN(ctx, file, path) \
2253 Acquire(thr, pc, File2addr(path)); \
2255 int fd = fileno_unlocked(file); \
2256 if (fd >= 0) FdFileCreate(thr, pc, fd); \
2259 #define COMMON_INTERCEPTOR_FILE_CLOSE(ctx, file) \
2261 int fd = fileno_unlocked(file); \
2262 if (fd >= 0) FdClose(thr, pc, fd); \
2265 #define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, handle) \
2266 libignore()->OnLibraryLoaded(filename)
2268 #define COMMON_INTERCEPTOR_LIBRARY_UNLOADED() \
2269 libignore()->OnLibraryUnloaded()
2271 #define COMMON_INTERCEPTOR_ACQUIRE(ctx, u) \
2272 Acquire(((TsanInterceptorContext *) ctx)->thr, pc, u)
2274 #define COMMON_INTERCEPTOR_RELEASE(ctx, u) \
2275 Release(((TsanInterceptorContext *) ctx)->thr, pc, u)
2277 #define COMMON_INTERCEPTOR_DIR_ACQUIRE(ctx, path) \
2278 Acquire(((TsanInterceptorContext *) ctx)->thr, pc, Dir2addr(path))
2280 #define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \
2281 FdAcquire(((TsanInterceptorContext *) ctx)->thr, pc, fd)
2283 #define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \
2284 FdRelease(((TsanInterceptorContext *) ctx)->thr, pc, fd)
2286 #define COMMON_INTERCEPTOR_FD_ACCESS(ctx, fd) \
2287 FdAccess(((TsanInterceptorContext *) ctx)->thr, pc, fd)
2289 #define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd) \
2290 FdSocketAccept(((TsanInterceptorContext *) ctx)->thr, pc, fd, newfd)
2292 #define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) \
2293 ThreadSetName(((TsanInterceptorContext *) ctx)->thr, name)
2295 #define COMMON_INTERCEPTOR_SET_PTHREAD_NAME(ctx, thread, name) \
2296 __tsan::ctx->thread_registry->SetThreadNameByUserId(thread, name)
2298 #define COMMON_INTERCEPTOR_BLOCK_REAL(name) BLOCK_REAL(name)
2300 #define COMMON_INTERCEPTOR_ON_EXIT(ctx) \
2301 OnExit(((TsanInterceptorContext *) ctx)->thr)
2303 #define COMMON_INTERCEPTOR_MUTEX_PRE_LOCK(ctx, m) \
2304 MutexPreLock(((TsanInterceptorContext *)ctx)->thr, \
2305 ((TsanInterceptorContext *)ctx)->pc, (uptr)m)
2307 #define COMMON_INTERCEPTOR_MUTEX_POST_LOCK(ctx, m) \
2308 MutexPostLock(((TsanInterceptorContext *)ctx)->thr, \
2309 ((TsanInterceptorContext *)ctx)->pc, (uptr)m)
2311 #define COMMON_INTERCEPTOR_MUTEX_UNLOCK(ctx, m) \
2312 MutexUnlock(((TsanInterceptorContext *)ctx)->thr, \
2313 ((TsanInterceptorContext *)ctx)->pc, (uptr)m)
2315 #define COMMON_INTERCEPTOR_MUTEX_REPAIR(ctx, m) \
2316 MutexRepair(((TsanInterceptorContext *)ctx)->thr, \
2317 ((TsanInterceptorContext *)ctx)->pc, (uptr)m)
2319 #define COMMON_INTERCEPTOR_MUTEX_INVALID(ctx, m) \
2320 MutexInvalidAccess(((TsanInterceptorContext *)ctx)->thr, \
2321 ((TsanInterceptorContext *)ctx)->pc, (uptr)m)
2323 #define COMMON_INTERCEPTOR_MMAP_IMPL(ctx, mmap, addr, sz, prot, flags, fd, \
2326 return mmap_interceptor(thr, pc, REAL(mmap), addr, sz, prot, flags, fd, \
2331 #define COMMON_INTERCEPTOR_HANDLE_RECVMSG(ctx, msg) \
2332 HandleRecvmsg(((TsanInterceptorContext *)ctx)->thr, \
2333 ((TsanInterceptorContext *)ctx)->pc, msg)
2336 #define COMMON_INTERCEPTOR_GET_TLS_RANGE(begin, end) \
2337 if (TsanThread *t = GetCurrentThread()) { \
2338 *begin = t->tls_begin(); \
2339 *end = t->tls_end(); \
2341 *begin = *end = 0; \
2344 #define COMMON_INTERCEPTOR_USER_CALLBACK_START() \
2345 SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_START()
2347 #define COMMON_INTERCEPTOR_USER_CALLBACK_END() \
2348 SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_END()
2350 #include "sanitizer_common/sanitizer_common_interceptors.inc"
2352 static int sigaction_impl(int sig, const __sanitizer_sigaction *act,
2353 __sanitizer_sigaction *old);
2354 static __sanitizer_sighandler_ptr signal_impl(int sig,
2355 __sanitizer_sighandler_ptr h);
2357 #define SIGNAL_INTERCEPTOR_SIGACTION_IMPL(signo, act, oldact) \
2358 { return sigaction_impl(signo, act, oldact); }
2360 #define SIGNAL_INTERCEPTOR_SIGNAL_IMPL(func, signo, handler) \
2361 { return (uptr)signal_impl(signo, (__sanitizer_sighandler_ptr)handler); }
2363 #include "sanitizer_common/sanitizer_signal_interceptors.inc"
2365 int sigaction_impl(int sig, const __sanitizer_sigaction *act,
2366 __sanitizer_sigaction *old) {
2367 // Note: if we call REAL(sigaction) directly for any reason without proxying
2368 // the signal handler through rtl_sigaction, very bad things will happen.
2369 // The handler will run synchronously and corrupt tsan per-thread state.
2370 SCOPED_INTERCEPTOR_RAW(sigaction, sig, act, old);
2371 __sanitizer_sigaction *sigactions = interceptor_ctx()->sigactions;
2372 __sanitizer_sigaction old_stored;
2373 if (old) internal_memcpy(&old_stored, &sigactions[sig], sizeof(old_stored));
2374 __sanitizer_sigaction newact;
2376 // Copy act into sigactions[sig].
2377 // Can't use struct copy, because compiler can emit call to memcpy.
2378 // Can't use internal_memcpy, because it copies byte-by-byte,
2379 // and signal handler reads the handler concurrently. It it can read
2380 // some bytes from old value and some bytes from new value.
2381 // Use volatile to prevent insertion of memcpy.
2382 sigactions[sig].handler =
2383 *(volatile __sanitizer_sighandler_ptr const *)&act->handler;
2384 sigactions[sig].sa_flags = *(volatile int const *)&act->sa_flags;
2385 internal_memcpy(&sigactions[sig].sa_mask, &act->sa_mask,
2386 sizeof(sigactions[sig].sa_mask));
2387 #if !SANITIZER_FREEBSD && !SANITIZER_MAC && !SANITIZER_NETBSD
2388 sigactions[sig].sa_restorer = act->sa_restorer;
2390 internal_memcpy(&newact, act, sizeof(newact));
2391 internal_sigfillset(&newact.sa_mask);
2392 if ((uptr)act->handler != sig_ign && (uptr)act->handler != sig_dfl) {
2393 if (newact.sa_flags & SA_SIGINFO)
2394 newact.sigaction = rtl_sigaction;
2396 newact.handler = rtl_sighandler;
2398 ReleaseStore(thr, pc, (uptr)&sigactions[sig]);
2401 int res = REAL(sigaction)(sig, act, old);
2402 if (res == 0 && old) {
2403 uptr cb = (uptr)old->sigaction;
2404 if (cb == (uptr)rtl_sigaction || cb == (uptr)rtl_sighandler) {
2405 internal_memcpy(old, &old_stored, sizeof(*old));
2411 static __sanitizer_sighandler_ptr signal_impl(int sig,
2412 __sanitizer_sighandler_ptr h) {
2413 __sanitizer_sigaction act;
2415 internal_memset(&act.sa_mask, -1, sizeof(act.sa_mask));
2417 __sanitizer_sigaction old;
2418 int res = sigaction_symname(sig, &act, &old);
2419 if (res) return (__sanitizer_sighandler_ptr)sig_err;
2423 #define TSAN_SYSCALL() \
2424 ThreadState *thr = cur_thread(); \
2425 if (thr->ignore_interceptors) \
2427 ScopedSyscall scoped_syscall(thr) \
2430 struct ScopedSyscall {
2433 explicit ScopedSyscall(ThreadState *thr)
2439 ProcessPendingSignals(thr);
2443 #if !SANITIZER_FREEBSD && !SANITIZER_MAC
2444 static void syscall_access_range(uptr pc, uptr p, uptr s, bool write) {
2446 MemoryAccessRange(thr, pc, p, s, write);
2449 static void syscall_acquire(uptr pc, uptr addr) {
2451 Acquire(thr, pc, addr);
2452 DPrintf("syscall_acquire(%p)\n", addr);
2455 static void syscall_release(uptr pc, uptr addr) {
2457 DPrintf("syscall_release(%p)\n", addr);
2458 Release(thr, pc, addr);
2461 static void syscall_fd_close(uptr pc, int fd) {
2463 FdClose(thr, pc, fd);
2466 static USED void syscall_fd_acquire(uptr pc, int fd) {
2468 FdAcquire(thr, pc, fd);
2469 DPrintf("syscall_fd_acquire(%p)\n", fd);
2472 static USED void syscall_fd_release(uptr pc, int fd) {
2474 DPrintf("syscall_fd_release(%p)\n", fd);
2475 FdRelease(thr, pc, fd);
2478 static void syscall_pre_fork(uptr pc) {
2480 ForkBefore(thr, pc);
2483 static void syscall_post_fork(uptr pc, int pid) {
2487 ForkChildAfter(thr, pc);
2489 } else if (pid > 0) {
2491 ForkParentAfter(thr, pc);
2494 ForkParentAfter(thr, pc);
2499 #define COMMON_SYSCALL_PRE_READ_RANGE(p, s) \
2500 syscall_access_range(GET_CALLER_PC(), (uptr)(p), (uptr)(s), false)
2502 #define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) \
2503 syscall_access_range(GET_CALLER_PC(), (uptr)(p), (uptr)(s), true)
2505 #define COMMON_SYSCALL_POST_READ_RANGE(p, s) \
2511 #define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) \
2517 #define COMMON_SYSCALL_ACQUIRE(addr) \
2518 syscall_acquire(GET_CALLER_PC(), (uptr)(addr))
2520 #define COMMON_SYSCALL_RELEASE(addr) \
2521 syscall_release(GET_CALLER_PC(), (uptr)(addr))
2523 #define COMMON_SYSCALL_FD_CLOSE(fd) syscall_fd_close(GET_CALLER_PC(), fd)
2525 #define COMMON_SYSCALL_FD_ACQUIRE(fd) syscall_fd_acquire(GET_CALLER_PC(), fd)
2527 #define COMMON_SYSCALL_FD_RELEASE(fd) syscall_fd_release(GET_CALLER_PC(), fd)
2529 #define COMMON_SYSCALL_PRE_FORK() \
2530 syscall_pre_fork(GET_CALLER_PC())
2532 #define COMMON_SYSCALL_POST_FORK(res) \
2533 syscall_post_fork(GET_CALLER_PC(), res)
2535 #include "sanitizer_common/sanitizer_common_syscalls.inc"
2536 #include "sanitizer_common/sanitizer_syscalls_netbsd.inc"
2538 #ifdef NEED_TLS_GET_ADDR
2539 // Define own interceptor instead of sanitizer_common's for three reasons:
2540 // 1. It must not process pending signals.
2541 // Signal handlers may contain MOVDQA instruction (see below).
2542 // 2. It must be as simple as possible to not contain MOVDQA.
2543 // 3. Sanitizer_common version uses COMMON_INTERCEPTOR_INITIALIZE_RANGE which
2544 // is empty for tsan (meant only for msan).
2545 // Note: __tls_get_addr can be called with mis-aligned stack due to:
2546 // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58066
2547 // So the interceptor must work with mis-aligned stack, in particular, does not
2548 // execute MOVDQA with stack addresses.
2549 TSAN_INTERCEPTOR(void *, __tls_get_addr, void *arg) {
2550 void *res = REAL(__tls_get_addr)(arg);
2551 ThreadState *thr = cur_thread();
2554 DTLS::DTV *dtv = DTLS_on_tls_get_addr(arg, res, thr->tls_addr,
2555 thr->tls_addr + thr->tls_size);
2558 // New DTLS block has been allocated.
2559 MemoryResetRange(thr, 0, dtv->beg, dtv->size);
2564 #if SANITIZER_NETBSD
2565 TSAN_INTERCEPTOR(void, _lwp_exit) {
2566 SCOPED_TSAN_INTERCEPTOR(_lwp_exit);
2567 DestroyThreadState();
2570 #define TSAN_MAYBE_INTERCEPT__LWP_EXIT TSAN_INTERCEPT(_lwp_exit)
2572 #define TSAN_MAYBE_INTERCEPT__LWP_EXIT
2575 #if SANITIZER_FREEBSD
2576 TSAN_INTERCEPTOR(void, thr_exit, tid_t *state) {
2577 SCOPED_TSAN_INTERCEPTOR(thr_exit, state);
2578 DestroyThreadState();
2579 REAL(thr_exit(state));
2581 #define TSAN_MAYBE_INTERCEPT_THR_EXIT TSAN_INTERCEPT(thr_exit)
2583 #define TSAN_MAYBE_INTERCEPT_THR_EXIT
2586 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_init, void *c, void *a)
2587 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_signal, void *c)
2588 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_broadcast, void *c)
2589 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_wait, void *c, void *m)
2590 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_destroy, void *c)
2591 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, mutex_init, void *m, void *a)
2592 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, mutex_destroy, void *m)
2593 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, mutex_trylock, void *m)
2594 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_init, void *m, void *a)
2595 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_destroy, void *m)
2596 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_rdlock, void *m)
2597 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_tryrdlock, void *m)
2598 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_wrlock, void *m)
2599 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_trywrlock, void *m)
2600 TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_unlock, void *m)
2601 TSAN_INTERCEPTOR_NETBSD_ALIAS_THR(int, once, void *o, void (*f)())
2602 TSAN_INTERCEPTOR_NETBSD_ALIAS_THR2(int, sigsetmask, sigmask, int a, void *b,
2607 static void finalize(void *arg) {
2608 ThreadState *thr = cur_thread();
2609 int status = Finalize(thr);
2610 // Make sure the output is not lost.
2616 #if !SANITIZER_MAC && !SANITIZER_ANDROID
2617 static void unreachable() {
2618 Report("FATAL: ThreadSanitizer: unreachable called\n");
2623 void InitializeInterceptors() {
2625 // We need to setup it early, because functions like dlsym() can call it.
2626 REAL(memset) = internal_memset;
2627 REAL(memcpy) = internal_memcpy;
2630 // Instruct libc malloc to consume less memory.
2632 mallopt(1, 0); // M_MXFAST
2633 mallopt(-3, 32*1024); // M_MMAP_THRESHOLD
2636 new(interceptor_ctx()) InterceptorContext();
2638 InitializeCommonInterceptors();
2639 InitializeSignalInterceptors();
2642 // We can not use TSAN_INTERCEPT to get setjmp addr,
2643 // because it does &setjmp and setjmp is not present in some versions of libc.
2644 using __interception::GetRealFunctionAddress;
2645 GetRealFunctionAddress(TSAN_STRING_SETJMP,
2646 (uptr*)&REAL(setjmp_symname), 0, 0);
2647 GetRealFunctionAddress("_setjmp", (uptr*)&REAL(_setjmp), 0, 0);
2648 GetRealFunctionAddress(TSAN_STRING_SIGSETJMP,
2649 (uptr*)&REAL(sigsetjmp_symname), 0, 0);
2650 #if !SANITIZER_NETBSD
2651 GetRealFunctionAddress("__sigsetjmp", (uptr*)&REAL(__sigsetjmp), 0, 0);
2655 TSAN_INTERCEPT(longjmp_symname);
2656 TSAN_INTERCEPT(siglongjmp_symname);
2657 #if SANITIZER_NETBSD
2658 TSAN_INTERCEPT(_longjmp);
2661 TSAN_INTERCEPT(malloc);
2662 TSAN_INTERCEPT(__libc_memalign);
2663 TSAN_INTERCEPT(calloc);
2664 TSAN_INTERCEPT(realloc);
2665 TSAN_INTERCEPT(free);
2666 TSAN_INTERCEPT(cfree);
2667 TSAN_INTERCEPT(munmap);
2668 TSAN_MAYBE_INTERCEPT_MEMALIGN;
2669 TSAN_INTERCEPT(valloc);
2670 TSAN_MAYBE_INTERCEPT_PVALLOC;
2671 TSAN_INTERCEPT(posix_memalign);
2673 TSAN_INTERCEPT(strcpy); // NOLINT
2674 TSAN_INTERCEPT(strncpy);
2675 TSAN_INTERCEPT(strdup);
2677 TSAN_INTERCEPT(pthread_create);
2678 TSAN_INTERCEPT(pthread_join);
2679 TSAN_INTERCEPT(pthread_detach);
2681 TSAN_INTERCEPT(pthread_tryjoin_np);
2682 TSAN_INTERCEPT(pthread_timedjoin_np);
2685 TSAN_INTERCEPT_VER(pthread_cond_init, PTHREAD_ABI_BASE);
2686 TSAN_INTERCEPT_VER(pthread_cond_signal, PTHREAD_ABI_BASE);
2687 TSAN_INTERCEPT_VER(pthread_cond_broadcast, PTHREAD_ABI_BASE);
2688 TSAN_INTERCEPT_VER(pthread_cond_wait, PTHREAD_ABI_BASE);
2689 TSAN_INTERCEPT_VER(pthread_cond_timedwait, PTHREAD_ABI_BASE);
2690 TSAN_INTERCEPT_VER(pthread_cond_destroy, PTHREAD_ABI_BASE);
2692 TSAN_INTERCEPT(pthread_mutex_init);
2693 TSAN_INTERCEPT(pthread_mutex_destroy);
2694 TSAN_INTERCEPT(pthread_mutex_trylock);
2695 TSAN_INTERCEPT(pthread_mutex_timedlock);
2697 TSAN_INTERCEPT(pthread_spin_init);
2698 TSAN_INTERCEPT(pthread_spin_destroy);
2699 TSAN_INTERCEPT(pthread_spin_lock);
2700 TSAN_INTERCEPT(pthread_spin_trylock);
2701 TSAN_INTERCEPT(pthread_spin_unlock);
2703 TSAN_INTERCEPT(pthread_rwlock_init);
2704 TSAN_INTERCEPT(pthread_rwlock_destroy);
2705 TSAN_INTERCEPT(pthread_rwlock_rdlock);
2706 TSAN_INTERCEPT(pthread_rwlock_tryrdlock);
2707 TSAN_INTERCEPT(pthread_rwlock_timedrdlock);
2708 TSAN_INTERCEPT(pthread_rwlock_wrlock);
2709 TSAN_INTERCEPT(pthread_rwlock_trywrlock);
2710 TSAN_INTERCEPT(pthread_rwlock_timedwrlock);
2711 TSAN_INTERCEPT(pthread_rwlock_unlock);
2713 TSAN_INTERCEPT(pthread_barrier_init);
2714 TSAN_INTERCEPT(pthread_barrier_destroy);
2715 TSAN_INTERCEPT(pthread_barrier_wait);
2717 TSAN_INTERCEPT(pthread_once);
2719 TSAN_INTERCEPT(fstat);
2720 TSAN_MAYBE_INTERCEPT___FXSTAT;
2721 TSAN_MAYBE_INTERCEPT_FSTAT64;
2722 TSAN_MAYBE_INTERCEPT___FXSTAT64;
2723 TSAN_INTERCEPT(open);
2724 TSAN_MAYBE_INTERCEPT_OPEN64;
2725 TSAN_INTERCEPT(creat);
2726 TSAN_MAYBE_INTERCEPT_CREAT64;
2727 TSAN_INTERCEPT(dup);
2728 TSAN_INTERCEPT(dup2);
2729 TSAN_INTERCEPT(dup3);
2730 TSAN_MAYBE_INTERCEPT_EVENTFD;
2731 TSAN_MAYBE_INTERCEPT_SIGNALFD;
2732 TSAN_MAYBE_INTERCEPT_INOTIFY_INIT;
2733 TSAN_MAYBE_INTERCEPT_INOTIFY_INIT1;
2734 TSAN_INTERCEPT(socket);
2735 TSAN_INTERCEPT(socketpair);
2736 TSAN_INTERCEPT(connect);
2737 TSAN_INTERCEPT(bind);
2738 TSAN_INTERCEPT(listen);
2739 TSAN_MAYBE_INTERCEPT_EPOLL;
2740 TSAN_INTERCEPT(close);
2741 TSAN_MAYBE_INTERCEPT___CLOSE;
2742 TSAN_MAYBE_INTERCEPT___RES_ICLOSE;
2743 TSAN_INTERCEPT(pipe);
2744 TSAN_INTERCEPT(pipe2);
2746 TSAN_INTERCEPT(unlink);
2747 TSAN_INTERCEPT(tmpfile);
2748 TSAN_MAYBE_INTERCEPT_TMPFILE64;
2749 TSAN_INTERCEPT(abort);
2750 TSAN_INTERCEPT(rmdir);
2751 TSAN_INTERCEPT(closedir);
2753 TSAN_INTERCEPT(sigsuspend);
2754 TSAN_INTERCEPT(sigblock);
2755 TSAN_INTERCEPT(sigsetmask);
2756 TSAN_INTERCEPT(pthread_sigmask);
2757 TSAN_INTERCEPT(raise);
2758 TSAN_INTERCEPT(kill);
2759 TSAN_INTERCEPT(pthread_kill);
2760 TSAN_INTERCEPT(sleep);
2761 TSAN_INTERCEPT(usleep);
2762 TSAN_INTERCEPT(nanosleep);
2763 TSAN_INTERCEPT(pause);
2764 TSAN_INTERCEPT(gettimeofday);
2765 TSAN_INTERCEPT(getaddrinfo);
2767 TSAN_INTERCEPT(fork);
2768 TSAN_INTERCEPT(vfork);
2769 #if !SANITIZER_ANDROID
2770 TSAN_INTERCEPT(dl_iterate_phdr);
2772 TSAN_MAYBE_INTERCEPT_ON_EXIT;
2773 TSAN_INTERCEPT(__cxa_atexit);
2774 TSAN_INTERCEPT(_exit);
2776 #ifdef NEED_TLS_GET_ADDR
2777 TSAN_INTERCEPT(__tls_get_addr);
2780 TSAN_MAYBE_INTERCEPT__LWP_EXIT;
2781 TSAN_MAYBE_INTERCEPT_THR_EXIT;
2783 #if !SANITIZER_MAC && !SANITIZER_ANDROID
2784 // Need to setup it, because interceptors check that the function is resolved.
2785 // But atexit is emitted directly into the module, so can't be resolved.
2786 REAL(atexit) = (int(*)(void(*)()))unreachable;
2789 if (REAL(__cxa_atexit)(&finalize, 0, 0)) {
2790 Printf("ThreadSanitizer: failed to setup atexit callback\n");
2794 #if !SANITIZER_MAC && !SANITIZER_NETBSD && !SANITIZER_FREEBSD
2795 if (pthread_key_create(&interceptor_ctx()->finalize_key, &thread_finalize)) {
2796 Printf("ThreadSanitizer: failed to create thread key\n");
2801 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(cond_init);
2802 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(cond_signal);
2803 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(cond_broadcast);
2804 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(cond_wait);
2805 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(cond_destroy);
2806 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(mutex_init);
2807 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(mutex_destroy);
2808 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(mutex_trylock);
2809 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_init);
2810 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_destroy);
2811 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_rdlock);
2812 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_tryrdlock);
2813 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_wrlock);
2814 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_trywrlock);
2815 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_unlock);
2816 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS_THR(once);
2817 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS_THR(sigsetmask);
2822 } // namespace __tsan
2824 // Invisible barrier for tests.
2825 // There were several unsuccessful iterations for this functionality:
2826 // 1. Initially it was implemented in user code using
2827 // REAL(pthread_barrier_wait). But pthread_barrier_wait is not supported on
2828 // MacOS. Futexes are linux-specific for this matter.
2829 // 2. Then we switched to atomics+usleep(10). But usleep produced parasitic
2830 // "as-if synchronized via sleep" messages in reports which failed some
2832 // 3. Then we switched to atomics+sched_yield. But this produced tons of tsan-
2833 // visible events, which lead to "failed to restore stack trace" failures.
2834 // Note that no_sanitize_thread attribute does not turn off atomic interception
2835 // so attaching it to the function defined in user code does not help.
2836 // That's why we now have what we have.
2837 extern "C" SANITIZER_INTERFACE_ATTRIBUTE
2838 void __tsan_testonly_barrier_init(u64 *barrier, u32 count) {
2839 if (count >= (1 << 8)) {
2840 Printf("barrier_init: count is too large (%d)\n", count);
2843 // 8 lsb is thread count, the remaining are count of entered threads.
2847 extern "C" SANITIZER_INTERFACE_ATTRIBUTE
2848 void __tsan_testonly_barrier_wait(u64 *barrier) {
2849 unsigned old = __atomic_fetch_add(barrier, 1 << 8, __ATOMIC_RELAXED);
2850 unsigned old_epoch = (old >> 8) / (old & 0xff);
2852 unsigned cur = __atomic_load_n(barrier, __ATOMIC_RELAXED);
2853 unsigned cur_epoch = (cur >> 8) / (cur & 0xff);
2854 if (cur_epoch != old_epoch)
2856 internal_sched_yield();