3303 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8//9// This file is a part of ThreadSanitizer (TSan), a race detector.10//11// FIXME: move as many interceptors as possible into12// sanitizer_common/sanitizer_common_interceptors.inc13//===----------------------------------------------------------------------===//14 15#include <stdarg.h>16 17#include "interception/interception.h"18#include "sanitizer_common/sanitizer_allocator_dlsym.h"19#include "sanitizer_common/sanitizer_atomic.h"20#include "sanitizer_common/sanitizer_errno.h"21#include "sanitizer_common/sanitizer_glibc_version.h"22#include "sanitizer_common/sanitizer_internal_defs.h"23#include "sanitizer_common/sanitizer_libc.h"24#include "sanitizer_common/sanitizer_linux.h"25#include "sanitizer_common/sanitizer_placement_new.h"26#include "sanitizer_common/sanitizer_platform_interceptors.h"27#include "sanitizer_common/sanitizer_platform_limits_netbsd.h"28#include "sanitizer_common/sanitizer_platform_limits_posix.h"29#include "sanitizer_common/sanitizer_posix.h"30#include "sanitizer_common/sanitizer_stacktrace.h"31#include "sanitizer_common/sanitizer_tls_get_addr.h"32#include "sanitizer_common/sanitizer_vector.h"33#include "tsan_fd.h"34#if SANITIZER_APPLE && !SANITIZER_GO35# include "tsan_flags.h"36#endif37#include "tsan_interceptors.h"38#include "tsan_interface.h"39#include "tsan_mman.h"40#include "tsan_platform.h"41#include "tsan_rtl.h"42#include "tsan_suppressions.h"43 44using namespace __tsan;45 46DECLARE_REAL(void *, memcpy, void *to, const void *from, SIZE_T size)47DECLARE_REAL(void *, memset, void *block, int c, SIZE_T size)48 49#if SANITIZER_FREEBSD || SANITIZER_APPLE50#define stdout __stdoutp51#define stderr __stderrp52#endif53 54#if SANITIZER_NETBSD55#define dirfd(dirp) (*(int *)(dirp))56#define fileno_unlocked(fp) \57 (((__sanitizer_FILE *)fp)->_file == -1 \58 ? -1 \59 : (int)(unsigned short)(((__sanitizer_FILE *)fp)->_file))60 61#define stdout ((__sanitizer_FILE*)&__sF[1])62#define stderr ((__sanitizer_FILE*)&__sF[2])63 64#define nanosleep __nanosleep5065#define vfork __vfork1466#endif67 68#ifdef __mips__69const int kSigCount = 129;70#else71const int kSigCount = 65;72#endif73 74#ifdef __mips__75struct ucontext_t {76 u64 opaque[768 / sizeof(u64) + 1];77};78#else79struct ucontext_t {80 // The size is determined by looking at sizeof of real ucontext_t on linux.81 u64 opaque[936 / sizeof(u64) + 1];82};83#endif84 85extern "C" int pthread_attr_init(void *attr);86extern "C" int pthread_attr_destroy(void *attr);87DECLARE_REAL(int, pthread_attr_getdetachstate, void *, void *)88extern "C" int pthread_attr_setstacksize(void *attr, uptr stacksize);89extern "C" int pthread_atfork(void (*prepare)(void), void (*parent)(void),90 void (*child)(void));91extern "C" int pthread_key_create(unsigned *key, void (*destructor)(void* v));92extern "C" int pthread_setspecific(unsigned key, const void *v);93DECLARE_REAL(int, pthread_mutexattr_gettype, void *, void *)94DECLARE_REAL(int, fflush, __sanitizer_FILE *fp)95DECLARE_REAL_AND_INTERCEPTOR(void *, malloc, usize size)96DECLARE_REAL_AND_INTERCEPTOR(void, free, void *ptr)97extern "C" int pthread_equal(void *t1, void *t2);98extern "C" void *pthread_self();99extern "C" void _exit(int status);100#if !SANITIZER_NETBSD101extern "C" int fileno_unlocked(void *stream);102extern "C" int dirfd(void *dirp);103#endif104#if SANITIZER_NETBSD105extern __sanitizer_FILE __sF[];106#else107extern __sanitizer_FILE *stdout, *stderr;108#endif109#if !SANITIZER_FREEBSD && !SANITIZER_APPLE && !SANITIZER_NETBSD110const int PTHREAD_MUTEX_RECURSIVE = 1;111const int PTHREAD_MUTEX_RECURSIVE_NP = 1;112#else113const int PTHREAD_MUTEX_RECURSIVE = 2;114const int PTHREAD_MUTEX_RECURSIVE_NP = 2;115#endif116#if !SANITIZER_FREEBSD && !SANITIZER_APPLE && !SANITIZER_NETBSD117const int EPOLL_CTL_ADD = 1;118#endif119const int SIGILL = 4;120const int SIGTRAP = 5;121const int SIGABRT = 6;122const int SIGFPE = 8;123const int SIGSEGV = 11;124const int SIGPIPE = 13;125const int SIGTERM = 15;126#if defined(__mips__) || SANITIZER_FREEBSD || SANITIZER_APPLE || SANITIZER_NETBSD127const int SIGBUS = 10;128const int SIGSYS = 12;129#else130const int SIGBUS = 7;131const int SIGSYS = 31;132#endif133#if SANITIZER_HAS_SIGINFO134const int SI_TIMER = -2;135#endif136void *const MAP_FAILED = (void*)-1;137#if SANITIZER_NETBSD138const int PTHREAD_BARRIER_SERIAL_THREAD = 1234567;139#elif !SANITIZER_APPLE140const int PTHREAD_BARRIER_SERIAL_THREAD = -1;141#endif142const int MAP_FIXED = 0x10;143typedef long long_t;144typedef __sanitizer::u16 mode_t;145 146// From /usr/include/unistd.h147# define F_ULOCK 0 /* Unlock a previously locked region. */148# define F_LOCK 1 /* Lock a region for exclusive use. */149# define F_TLOCK 2 /* Test and lock a region for exclusive use. */150# define F_TEST 3 /* Test a region for other processes locks. */151 152#if SANITIZER_FREEBSD || SANITIZER_APPLE || SANITIZER_NETBSD153const int SA_SIGINFO = 0x40;154const int SIG_SETMASK = 3;155#elif defined(__mips__)156const int SA_SIGINFO = 8;157const int SIG_SETMASK = 3;158#else159const int SA_SIGINFO = 4;160const int SIG_SETMASK = 2;161#endif162 163namespace __tsan {164struct SignalDesc {165 bool armed;166 __sanitizer_siginfo siginfo;167 ucontext_t ctx;168};169 170struct ThreadSignalContext {171 int int_signal_send;172 SignalDesc pending_signals[kSigCount];173 // emptyset and oldset are too big for stack.174 __sanitizer_sigset_t emptyset;175 __sanitizer::Vector<__sanitizer_sigset_t> oldset;176};177 178void EnterBlockingFunc(ThreadState *thr) {179 for (;;) {180 // The order is important to not delay a signal infinitely if it's181 // delivered right before we set in_blocking_func. Note: we can't call182 // ProcessPendingSignals when in_blocking_func is set, or we can handle183 // a signal synchronously when we are already handling a signal.184 atomic_store(&thr->in_blocking_func, 1, memory_order_relaxed);185 if (atomic_load(&thr->pending_signals, memory_order_relaxed) == 0)186 break;187 atomic_store(&thr->in_blocking_func, 0, memory_order_relaxed);188 ProcessPendingSignals(thr);189 }190}191 192// The sole reason tsan wraps atexit callbacks is to establish synchronization193// between callback setup and callback execution.194struct AtExitCtx {195 void (*f)();196 void *arg;197 uptr pc;198};199 200// InterceptorContext holds all global data required for interceptors.201// It's explicitly constructed in InitializeInterceptors with placement new202// and is never destroyed. This allows usage of members with non-trivial203// constructors and destructors.204struct InterceptorContext {205 // The object is 64-byte aligned, because we want hot data to be located206 // in a single cache line if possible (it's accessed in every interceptor).207 alignas(64) LibIgnore libignore;208 __sanitizer_sigaction sigactions[kSigCount];209#if !SANITIZER_APPLE && !SANITIZER_NETBSD210 unsigned finalize_key;211#endif212 213 Mutex atexit_mu;214 Vector<struct AtExitCtx *> AtExitStack;215 216 InterceptorContext() : libignore(LINKER_INITIALIZED), atexit_mu(MutexTypeAtExit), AtExitStack() {}217};218 219alignas(64) static char interceptor_placeholder[sizeof(InterceptorContext)];220InterceptorContext *interceptor_ctx() {221 return reinterpret_cast<InterceptorContext*>(&interceptor_placeholder[0]);222}223 224LibIgnore *libignore() {225 return &interceptor_ctx()->libignore;226}227 228void InitializeLibIgnore() {229 const SuppressionContext &supp = *Suppressions();230 const uptr n = supp.SuppressionCount();231 for (uptr i = 0; i < n; i++) {232 const Suppression *s = supp.SuppressionAt(i);233 if (0 == internal_strcmp(s->type, kSuppressionLib))234 libignore()->AddIgnoredLibrary(s->templ);235 }236 if (flags()->ignore_noninstrumented_modules)237 libignore()->IgnoreNoninstrumentedModules(true);238 libignore()->OnLibraryLoaded(0);239}240 241// The following two hooks can be used by for cooperative scheduling when242// locking.243#ifdef TSAN_EXTERNAL_HOOKS244void OnPotentiallyBlockingRegionBegin();245void OnPotentiallyBlockingRegionEnd();246#else247SANITIZER_WEAK_CXX_DEFAULT_IMPL void OnPotentiallyBlockingRegionBegin() {}248SANITIZER_WEAK_CXX_DEFAULT_IMPL void OnPotentiallyBlockingRegionEnd() {}249#endif250 251// FIXME: Use for `in_symbolizer()` as well. As-is we can't use252// `DlSymAllocator`, because it uses the primary allocator only. Symbolizer253// requires support of the secondary allocator for larger blocks.254struct DlsymAlloc : public DlSymAllocator<DlsymAlloc> {255 static bool UseImpl() { return (ctx && !ctx->initialized); }256};257 258} // namespace __tsan259 260static ThreadSignalContext *SigCtx(ThreadState *thr) {261 // This function may be called reentrantly if it is interrupted by a signal262 // handler. Use CAS to handle the race.263 uptr ctx = atomic_load(&thr->signal_ctx, memory_order_relaxed);264 if (ctx == 0 && !thr->is_dead) {265 uptr pctx =266 (uptr)MmapOrDie(sizeof(ThreadSignalContext), "ThreadSignalContext");267 MemoryResetRange(thr, (uptr)&SigCtx, pctx, sizeof(ThreadSignalContext));268 if (atomic_compare_exchange_strong(&thr->signal_ctx, &ctx, pctx,269 memory_order_relaxed)) {270 ctx = pctx;271 } else {272 UnmapOrDie((ThreadSignalContext *)pctx, sizeof(ThreadSignalContext));273 }274 }275 return (ThreadSignalContext *)ctx;276}277 278ScopedInterceptor::ScopedInterceptor(ThreadState *thr, const char *fname,279 uptr pc)280 : thr_(thr) {281 LazyInitialize(thr);282 if (UNLIKELY(atomic_load(&thr->in_blocking_func, memory_order_relaxed))) {283 // pthread_join is marked as blocking, but it's also known to call other284 // intercepted functions (mmap, free). If we don't reset in_blocking_func285 // we can get deadlocks and memory corruptions if we deliver a synchronous286 // signal inside of an mmap/free interceptor.287 // So reset it and restore it back in the destructor.288 // See https://github.com/google/sanitizers/issues/1540289 atomic_store(&thr->in_blocking_func, 0, memory_order_relaxed);290 in_blocking_func_ = true;291 }292 if (!thr_->is_inited) return;293 if (!thr_->ignore_interceptors) FuncEntry(thr, pc);294 DPrintf("#%d: intercept %s()\n", thr_->tid, fname);295 ignoring_ =296 !thr_->in_ignored_lib && (flags()->ignore_interceptors_accesses ||297 libignore()->IsIgnored(pc, &in_ignored_lib_));298 EnableIgnores();299}300 301ScopedInterceptor::~ScopedInterceptor() {302 if (!thr_->is_inited) return;303 DisableIgnores();304 if (UNLIKELY(in_blocking_func_))305 EnterBlockingFunc(thr_);306 if (!thr_->ignore_interceptors) {307 ProcessPendingSignals(thr_);308 FuncExit(thr_);309 CheckedMutex::CheckNoLocks();310 }311}312 313NOINLINE314void ScopedInterceptor::EnableIgnoresImpl() {315 ThreadIgnoreBegin(thr_, 0);316 if (flags()->ignore_noninstrumented_modules)317 thr_->suppress_reports++;318 if (in_ignored_lib_) {319 DCHECK(!thr_->in_ignored_lib);320 thr_->in_ignored_lib = true;321 }322}323 324NOINLINE325void ScopedInterceptor::DisableIgnoresImpl() {326 ThreadIgnoreEnd(thr_);327 if (flags()->ignore_noninstrumented_modules)328 thr_->suppress_reports--;329 if (in_ignored_lib_) {330 DCHECK(thr_->in_ignored_lib);331 thr_->in_ignored_lib = false;332 }333}334 335#define TSAN_INTERCEPT(func) INTERCEPT_FUNCTION(func)336#if SANITIZER_FREEBSD337# define TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(func) \338 INTERCEPT_FUNCTION(_pthread_##func)339#else340# define TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(func)341#endif342#if SANITIZER_NETBSD343# define TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(func) \344 INTERCEPT_FUNCTION(__libc_##func)345# define TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS_THR(func) \346 INTERCEPT_FUNCTION(__libc_thr_##func)347#else348# define TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(func)349# define TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS_THR(func)350#endif351 352#define READ_STRING_OF_LEN(thr, pc, s, len, n) \353 MemoryAccessRange((thr), (pc), (uptr)(s), \354 common_flags()->strict_string_checks ? (len) + 1 : (n), false)355 356#define READ_STRING(thr, pc, s, n) \357 READ_STRING_OF_LEN((thr), (pc), (s), internal_strlen(s), (n))358 359#define BLOCK_REAL(name) (BlockingCall(thr), REAL(name))360 361struct BlockingCall {362 explicit BlockingCall(ThreadState *thr)363 : thr(thr) {364 EnterBlockingFunc(thr);365 // When we are in a "blocking call", we process signals asynchronously366 // (right when they arrive). In this context we do not expect to be367 // executing any user/runtime code. The known interceptor sequence when368 // this is not true is: pthread_join -> munmap(stack). It's fine369 // to ignore munmap in this case -- we handle stack shadow separately.370 thr->ignore_interceptors++;371 }372 373 ~BlockingCall() {374 thr->ignore_interceptors--;375 atomic_store(&thr->in_blocking_func, 0, memory_order_relaxed);376 }377 378 ThreadState *thr;379};380 381TSAN_INTERCEPTOR(unsigned, sleep, unsigned sec) {382 SCOPED_TSAN_INTERCEPTOR(sleep, sec);383 unsigned res = BLOCK_REAL(sleep)(sec);384 AfterSleep(thr, pc);385 return res;386}387 388TSAN_INTERCEPTOR(int, usleep, long_t usec) {389 SCOPED_TSAN_INTERCEPTOR(usleep, usec);390 int res = BLOCK_REAL(usleep)(usec);391 AfterSleep(thr, pc);392 return res;393}394 395TSAN_INTERCEPTOR(int, nanosleep, void *req, void *rem) {396 SCOPED_TSAN_INTERCEPTOR(nanosleep, req, rem);397 int res = BLOCK_REAL(nanosleep)(req, rem);398 AfterSleep(thr, pc);399 return res;400}401 402TSAN_INTERCEPTOR(int, pause, int fake) {403 SCOPED_TSAN_INTERCEPTOR(pause, fake);404 return BLOCK_REAL(pause)(fake);405}406 407// Note: we specifically call the function in such strange way408// with "installed_at" because in reports it will appear between409// callback frames and the frame that installed the callback.410static void at_exit_callback_installed_at() {411 AtExitCtx *ctx;412 {413 // Ensure thread-safety.414 Lock l(&interceptor_ctx()->atexit_mu);415 416 // Pop AtExitCtx from the top of the stack of callback functions417 uptr element = interceptor_ctx()->AtExitStack.Size() - 1;418 ctx = interceptor_ctx()->AtExitStack[element];419 interceptor_ctx()->AtExitStack.PopBack();420 }421 422 ThreadState *thr = cur_thread();423 Acquire(thr, ctx->pc, (uptr)ctx);424 FuncEntry(thr, ctx->pc);425 ((void(*)())ctx->f)();426 FuncExit(thr);427 Free(ctx);428}429 430static void cxa_at_exit_callback_installed_at(void *arg) {431 ThreadState *thr = cur_thread();432 AtExitCtx *ctx = (AtExitCtx*)arg;433 Acquire(thr, ctx->pc, (uptr)arg);434 FuncEntry(thr, ctx->pc);435 ((void(*)(void *arg))ctx->f)(ctx->arg);436 FuncExit(thr);437 Free(ctx);438}439 440static int setup_at_exit_wrapper(ThreadState *thr, uptr pc, void(*f)(),441 void *arg, void *dso);442 443#if !SANITIZER_ANDROID444TSAN_INTERCEPTOR(int, atexit, void (*f)()) {445 if (in_symbolizer())446 return 0;447 // We want to setup the atexit callback even if we are in ignored lib448 // or after fork.449 SCOPED_INTERCEPTOR_RAW(atexit, f);450 return setup_at_exit_wrapper(thr, GET_CALLER_PC(), (void (*)())f, 0, 0);451}452#endif453 454TSAN_INTERCEPTOR(int, __cxa_atexit, void (*f)(void *a), void *arg, void *dso) {455 if (in_symbolizer())456 return 0;457 SCOPED_TSAN_INTERCEPTOR(__cxa_atexit, f, arg, dso);458 return setup_at_exit_wrapper(thr, GET_CALLER_PC(), (void (*)())f, arg, dso);459}460 461static int setup_at_exit_wrapper(ThreadState *thr, uptr pc, void(*f)(),462 void *arg, void *dso) {463 auto *ctx = New<AtExitCtx>();464 ctx->f = f;465 ctx->arg = arg;466 ctx->pc = pc;467 Release(thr, pc, (uptr)ctx);468 // Memory allocation in __cxa_atexit will race with free during exit,469 // because we do not see synchronization around atexit callback list.470 ThreadIgnoreBegin(thr, pc);471 int res;472 if (!dso) {473 // NetBSD does not preserve the 2nd argument if dso is equal to 0474 // Store ctx in a local stack-like structure475 476 // Ensure thread-safety.477 Lock l(&interceptor_ctx()->atexit_mu);478 // __cxa_atexit calls calloc. If we don't ignore interceptors, we will fail479 // due to atexit_mu held on exit from the calloc interceptor.480 ScopedIgnoreInterceptors ignore;481 482 res = REAL(__cxa_atexit)((void (*)(void *a))at_exit_callback_installed_at,483 0, 0);484 // Push AtExitCtx on the top of the stack of callback functions485 if (!res) {486 interceptor_ctx()->AtExitStack.PushBack(ctx);487 }488 } else {489 res = REAL(__cxa_atexit)(cxa_at_exit_callback_installed_at, ctx, dso);490 }491 ThreadIgnoreEnd(thr);492 return res;493}494 495#if !SANITIZER_APPLE && !SANITIZER_NETBSD496static void on_exit_callback_installed_at(int status, void *arg) {497 ThreadState *thr = cur_thread();498 AtExitCtx *ctx = (AtExitCtx*)arg;499 Acquire(thr, ctx->pc, (uptr)arg);500 FuncEntry(thr, ctx->pc);501 ((void(*)(int status, void *arg))ctx->f)(status, ctx->arg);502 FuncExit(thr);503 Free(ctx);504}505 506TSAN_INTERCEPTOR(int, on_exit, void(*f)(int, void*), void *arg) {507 if (in_symbolizer())508 return 0;509 SCOPED_TSAN_INTERCEPTOR(on_exit, f, arg);510 auto *ctx = New<AtExitCtx>();511 ctx->f = (void(*)())f;512 ctx->arg = arg;513 ctx->pc = GET_CALLER_PC();514 Release(thr, pc, (uptr)ctx);515 // Memory allocation in __cxa_atexit will race with free during exit,516 // because we do not see synchronization around atexit callback list.517 ThreadIgnoreBegin(thr, pc);518 int res = REAL(on_exit)(on_exit_callback_installed_at, ctx);519 ThreadIgnoreEnd(thr);520 return res;521}522#define TSAN_MAYBE_INTERCEPT_ON_EXIT TSAN_INTERCEPT(on_exit)523#else524#define TSAN_MAYBE_INTERCEPT_ON_EXIT525#endif526 527// Cleanup old bufs.528static void JmpBufGarbageCollect(ThreadState *thr, uptr sp) {529 for (uptr i = 0; i < thr->jmp_bufs.Size(); i++) {530 JmpBuf *buf = &thr->jmp_bufs[i];531 if (buf->sp <= sp) {532 uptr sz = thr->jmp_bufs.Size();533 internal_memcpy(buf, &thr->jmp_bufs[sz - 1], sizeof(*buf));534 thr->jmp_bufs.PopBack();535 i--;536 }537 }538}539 540static void SetJmp(ThreadState *thr, uptr sp) {541 if (!thr->is_inited) // called from libc guts during bootstrap542 return;543 // Cleanup old bufs.544 JmpBufGarbageCollect(thr, sp);545 // Remember the buf.546 JmpBuf *buf = thr->jmp_bufs.PushBack();547 buf->sp = sp;548 buf->shadow_stack_pos = thr->shadow_stack_pos;549 ThreadSignalContext *sctx = SigCtx(thr);550 buf->int_signal_send = sctx ? sctx->int_signal_send : 0;551 buf->oldset_stack_size = sctx ? sctx->oldset.Size() : 0;552 buf->in_blocking_func = atomic_load(&thr->in_blocking_func, memory_order_relaxed);553 buf->in_signal_handler = atomic_load(&thr->in_signal_handler,554 memory_order_relaxed);555}556 557static void LongJmp(ThreadState *thr, uptr *env) {558 uptr sp = ExtractLongJmpSp(env);559 // Find the saved buf with matching sp.560 for (uptr i = 0; i < thr->jmp_bufs.Size(); i++) {561 JmpBuf *buf = &thr->jmp_bufs[i];562 if (buf->sp == sp) {563 CHECK_GE(thr->shadow_stack_pos, buf->shadow_stack_pos);564 // Unwind the stack.565 while (thr->shadow_stack_pos > buf->shadow_stack_pos)566 FuncExit(thr);567 ThreadSignalContext *sctx = SigCtx(thr);568 if (sctx) {569 sctx->int_signal_send = buf->int_signal_send;570 while (sctx->oldset.Size() > buf->oldset_stack_size)571 sctx->oldset.PopBack();572 }573 atomic_store(&thr->in_blocking_func, buf->in_blocking_func,574 memory_order_relaxed);575 atomic_store(&thr->in_signal_handler, buf->in_signal_handler,576 memory_order_relaxed);577 JmpBufGarbageCollect(thr, buf->sp - 1); // do not collect buf->sp578 return;579 }580 }581 Printf("ThreadSanitizer: can't find longjmp buf\n");582 CHECK(0);583}584 585// FIXME: put everything below into a common extern "C" block?586extern "C" void __tsan_setjmp(uptr sp) { SetJmp(cur_thread_init(), sp); }587 588#if SANITIZER_APPLE589TSAN_INTERCEPTOR(int, setjmp, void *env);590TSAN_INTERCEPTOR(int, _setjmp, void *env);591TSAN_INTERCEPTOR(int, sigsetjmp, void *env);592#else // SANITIZER_APPLE593 594#if SANITIZER_NETBSD595#define setjmp_symname __setjmp14596#define sigsetjmp_symname __sigsetjmp14597#else598#define setjmp_symname setjmp599#define sigsetjmp_symname sigsetjmp600#endif601 602DEFINE_REAL(int, setjmp_symname, void *env)603DEFINE_REAL(int, _setjmp, void *env)604DEFINE_REAL(int, sigsetjmp_symname, void *env)605#if !SANITIZER_NETBSD606DEFINE_REAL(int, __sigsetjmp, void *env)607#endif608 609// The real interceptor for setjmp is special, and implemented in pure asm. We610// just need to initialize the REAL functions so that they can be used in asm.611static void InitializeSetjmpInterceptors() {612 // We can not use TSAN_INTERCEPT to get setjmp addr, because it does &setjmp and613 // setjmp is not present in some versions of libc.614 using __interception::InterceptFunction;615 InterceptFunction(SANITIZER_STRINGIFY(setjmp_symname), (uptr*)&REAL(setjmp_symname), 0, 0);616 InterceptFunction("_setjmp", (uptr*)&REAL(_setjmp), 0, 0);617 InterceptFunction(SANITIZER_STRINGIFY(sigsetjmp_symname), (uptr*)&REAL(sigsetjmp_symname), 0,618 0);619#if !SANITIZER_NETBSD620 InterceptFunction("__sigsetjmp", (uptr*)&REAL(__sigsetjmp), 0, 0);621#endif622}623#endif // SANITIZER_APPLE624 625#if SANITIZER_NETBSD626#define longjmp_symname __longjmp14627#define siglongjmp_symname __siglongjmp14628#else629#define longjmp_symname longjmp630#define siglongjmp_symname siglongjmp631#endif632 633TSAN_INTERCEPTOR(void, longjmp_symname, uptr *env, int val) {634 // Note: if we call REAL(longjmp) in the context of ScopedInterceptor,635 // bad things will happen. We will jump over ScopedInterceptor dtor and can636 // leave thr->in_ignored_lib set.637 {638 SCOPED_INTERCEPTOR_RAW(longjmp_symname, env, val);639 }640 LongJmp(cur_thread(), env);641 REAL(longjmp_symname)(env, val);642}643 644TSAN_INTERCEPTOR(void, siglongjmp_symname, uptr *env, int val) {645 {646 SCOPED_INTERCEPTOR_RAW(siglongjmp_symname, env, val);647 }648 LongJmp(cur_thread(), env);649 REAL(siglongjmp_symname)(env, val);650}651 652#if SANITIZER_NETBSD653TSAN_INTERCEPTOR(void, _longjmp, uptr *env, int val) {654 {655 SCOPED_INTERCEPTOR_RAW(_longjmp, env, val);656 }657 LongJmp(cur_thread(), env);658 REAL(_longjmp)(env, val);659}660#endif661 662#if !SANITIZER_APPLE663TSAN_INTERCEPTOR(void*, malloc, uptr size) {664 if (in_symbolizer())665 return InternalAlloc(size);666 if (DlsymAlloc::Use())667 return DlsymAlloc::Allocate(size);668 void *p = 0;669 {670 SCOPED_INTERCEPTOR_RAW(malloc, size);671 p = user_alloc(thr, pc, size);672 }673 invoke_malloc_hook(p, size);674 return p;675}676 677// In glibc<2.25, dynamic TLS blocks are allocated by __libc_memalign. Intercept678// __libc_memalign so that (1) we can detect races (2) free will not be called679// on libc internally allocated blocks.680TSAN_INTERCEPTOR(void*, __libc_memalign, uptr align, uptr sz) {681 SCOPED_INTERCEPTOR_RAW(__libc_memalign, align, sz);682 return user_memalign(thr, pc, align, sz);683}684 685TSAN_INTERCEPTOR(void *, calloc, uptr n, uptr size) {686 if (in_symbolizer())687 return InternalCalloc(n, size);688 if (DlsymAlloc::Use())689 return DlsymAlloc::Callocate(n, size);690 void *p = 0;691 {692 SCOPED_INTERCEPTOR_RAW(calloc, n, size);693 p = user_calloc(thr, pc, size, n);694 }695 invoke_malloc_hook(p, n * size);696 return p;697}698 699TSAN_INTERCEPTOR(void*, realloc, void *p, uptr size) {700 if (in_symbolizer())701 return InternalRealloc(p, size);702 if (DlsymAlloc::Use() || DlsymAlloc::PointerIsMine(p))703 return DlsymAlloc::Realloc(p, size);704 if (p)705 invoke_free_hook(p);706 {707 SCOPED_INTERCEPTOR_RAW(realloc, p, size);708 p = user_realloc(thr, pc, p, size);709 }710 invoke_malloc_hook(p, size);711 return p;712}713 714TSAN_INTERCEPTOR(void *, reallocarray, void *p, uptr n, uptr size) {715 if (in_symbolizer())716 return InternalReallocArray(p, n, size);717 if (p)718 invoke_free_hook(p);719 {720 SCOPED_INTERCEPTOR_RAW(reallocarray, p, n, size);721 p = user_reallocarray(thr, pc, p, size, n);722 }723 invoke_malloc_hook(p, size);724 return p;725}726 727TSAN_INTERCEPTOR(void, free, void *p) {728 if (UNLIKELY(!p))729 return;730 if (in_symbolizer())731 return InternalFree(p);732 if (DlsymAlloc::PointerIsMine(p))733 return DlsymAlloc::Free(p);734 invoke_free_hook(p);735 SCOPED_INTERCEPTOR_RAW(free, p);736 user_free(thr, pc, p);737}738 739# if SANITIZER_INTERCEPT_FREE_SIZED740TSAN_INTERCEPTOR(void, free_sized, void *p, uptr size) {741 if (UNLIKELY(!p))742 return;743 if (in_symbolizer())744 return InternalFree(p);745 if (DlsymAlloc::PointerIsMine(p))746 return DlsymAlloc::Free(p);747 invoke_free_hook(p);748 SCOPED_INTERCEPTOR_RAW(free_sized, p, size);749 user_free(thr, pc, p);750}751# define TSAN_MAYBE_INTERCEPT_FREE_SIZED INTERCEPT_FUNCTION(free_sized)752# else753# define TSAN_MAYBE_INTERCEPT_FREE_SIZED754# endif755 756# if SANITIZER_INTERCEPT_FREE_ALIGNED_SIZED757TSAN_INTERCEPTOR(void, free_aligned_sized, void *p, uptr alignment, uptr size) {758 if (UNLIKELY(!p))759 return;760 if (in_symbolizer())761 return InternalFree(p);762 if (DlsymAlloc::PointerIsMine(p))763 return DlsymAlloc::Free(p);764 invoke_free_hook(p);765 SCOPED_INTERCEPTOR_RAW(free_aligned_sized, p, alignment, size);766 user_free(thr, pc, p);767}768# define TSAN_MAYBE_INTERCEPT_FREE_ALIGNED_SIZED \769 INTERCEPT_FUNCTION(free_aligned_sized)770# else771# define TSAN_MAYBE_INTERCEPT_FREE_ALIGNED_SIZED772# endif773 774TSAN_INTERCEPTOR(void, cfree, void *p) {775 if (UNLIKELY(!p))776 return;777 if (in_symbolizer())778 return InternalFree(p);779 if (DlsymAlloc::PointerIsMine(p))780 return DlsymAlloc::Free(p);781 invoke_free_hook(p);782 SCOPED_INTERCEPTOR_RAW(cfree, p);783 user_free(thr, pc, p);784}785 786TSAN_INTERCEPTOR(uptr, malloc_usable_size, void *p) {787 SCOPED_INTERCEPTOR_RAW(malloc_usable_size, p);788 return user_alloc_usable_size(p);789}790#else791# define TSAN_MAYBE_INTERCEPT_FREE_SIZED792# define TSAN_MAYBE_INTERCEPT_FREE_ALIGNED_SIZED793#endif794 795TSAN_INTERCEPTOR(char *, strcpy, char *dst, const char *src) {796 SCOPED_TSAN_INTERCEPTOR(strcpy, dst, src);797 uptr srclen = internal_strlen(src);798 MemoryAccessRange(thr, pc, (uptr)dst, srclen + 1, true);799 MemoryAccessRange(thr, pc, (uptr)src, srclen + 1, false);800 return REAL(strcpy)(dst, src);801}802 803TSAN_INTERCEPTOR(char*, strncpy, char *dst, char *src, usize n) {804 SCOPED_TSAN_INTERCEPTOR(strncpy, dst, src, n);805 uptr srclen = internal_strnlen(src, n);806 MemoryAccessRange(thr, pc, (uptr)dst, n, true);807 MemoryAccessRange(thr, pc, (uptr)src, min(srclen + 1, n), false);808 return REAL(strncpy)(dst, src, n);809}810 811TSAN_INTERCEPTOR(char*, strdup, const char *str) {812 SCOPED_TSAN_INTERCEPTOR(strdup, str);813 // strdup will call malloc, so no instrumentation is required here.814 return REAL(strdup)(str);815}816 817// Zero out addr if it points into shadow memory and was provided as a hint818// only, i.e., MAP_FIXED is not set.819static bool fix_mmap_addr(void **addr, long_t sz, int flags) {820 if (*addr) {821 if (!IsAppMem((uptr)*addr) || !IsAppMem((uptr)*addr + sz - 1)) {822 if (flags & MAP_FIXED) {823 errno = errno_EINVAL;824 return false;825 } else {826 *addr = 0;827 }828 }829 }830 return true;831}832 833template <class Mmap>834static void *mmap_interceptor(ThreadState *thr, uptr pc, Mmap real_mmap,835 void *addr, SIZE_T sz, int prot, int flags,836 int fd, OFF64_T off) {837 if (!fix_mmap_addr(&addr, sz, flags)) return MAP_FAILED;838 void *res = real_mmap(addr, sz, prot, flags, fd, off);839 if (res != MAP_FAILED) {840 if (!IsAppMem((uptr)res) || !IsAppMem((uptr)res + sz - 1)) {841 Report("ThreadSanitizer: mmap at bad address: addr=%p size=%p res=%p\n",842 addr, (void*)sz, res);843 Die();844 }845 if (fd > 0) FdAccess(thr, pc, fd);846 MemoryRangeImitateWriteOrResetRange(thr, pc, (uptr)res, sz);847 }848 return res;849}850 851template <class Munmap>852static int munmap_interceptor(ThreadState *thr, uptr pc, Munmap real_munmap,853 void *addr, SIZE_T sz) {854 UnmapShadow(thr, (uptr)addr, sz);855 int res = real_munmap(addr, sz);856 return res;857}858 859#if SANITIZER_LINUX860TSAN_INTERCEPTOR(void*, memalign, uptr align, uptr sz) {861 SCOPED_INTERCEPTOR_RAW(memalign, align, sz);862 return user_memalign(thr, pc, align, sz);863}864#define TSAN_MAYBE_INTERCEPT_MEMALIGN TSAN_INTERCEPT(memalign)865#else866#define TSAN_MAYBE_INTERCEPT_MEMALIGN867#endif868 869#if !SANITIZER_APPLE870TSAN_INTERCEPTOR(void*, aligned_alloc, uptr align, uptr sz) {871 if (in_symbolizer())872 return InternalAlloc(sz, nullptr, align);873 SCOPED_INTERCEPTOR_RAW(aligned_alloc, align, sz);874 return user_aligned_alloc(thr, pc, align, sz);875}876 877TSAN_INTERCEPTOR(void*, valloc, uptr sz) {878 if (in_symbolizer())879 return InternalAlloc(sz, nullptr, GetPageSizeCached());880 SCOPED_INTERCEPTOR_RAW(valloc, sz);881 return user_valloc(thr, pc, sz);882}883#endif884 885#if SANITIZER_LINUX886TSAN_INTERCEPTOR(void*, pvalloc, uptr sz) {887 if (in_symbolizer()) {888 uptr PageSize = GetPageSizeCached();889 sz = sz ? RoundUpTo(sz, PageSize) : PageSize;890 return InternalAlloc(sz, nullptr, PageSize);891 }892 SCOPED_INTERCEPTOR_RAW(pvalloc, sz);893 return user_pvalloc(thr, pc, sz);894}895#define TSAN_MAYBE_INTERCEPT_PVALLOC TSAN_INTERCEPT(pvalloc)896#else897#define TSAN_MAYBE_INTERCEPT_PVALLOC898#endif899 900#if !SANITIZER_APPLE901TSAN_INTERCEPTOR(int, posix_memalign, void **memptr, uptr align, uptr sz) {902 if (in_symbolizer()) {903 void *p = InternalAlloc(sz, nullptr, align);904 if (!p)905 return errno_ENOMEM;906 *memptr = p;907 return 0;908 }909 SCOPED_INTERCEPTOR_RAW(posix_memalign, memptr, align, sz);910 return user_posix_memalign(thr, pc, memptr, align, sz);911}912#endif913 914// Both __cxa_guard_acquire and pthread_once 0-initialize915// the object initially. pthread_once does not have any916// other ABI requirements. __cxa_guard_acquire assumes917// that any non-0 value in the first byte means that918// initialization is completed. Contents of the remaining919// bytes are up to us.920constexpr u32 kGuardInit = 0;921constexpr u32 kGuardDone = 1;922constexpr u32 kGuardRunning = 1 << 16;923constexpr u32 kGuardWaiter = 1 << 17;924 925static int guard_acquire(ThreadState *thr, uptr pc, atomic_uint32_t *g,926 bool blocking_hooks = true) {927 bool in_potentially_blocking_region = false;928 auto on_exit = at_scope_exit([&] {929 if (in_potentially_blocking_region)930 OnPotentiallyBlockingRegionEnd();931 });932 933 for (;;) {934 u32 cmp = atomic_load(g, memory_order_acquire);935 if (cmp == kGuardInit) {936 if (atomic_compare_exchange_strong(g, &cmp, kGuardRunning,937 memory_order_relaxed))938 return 1;939 } else if (cmp == kGuardDone) {940 if (!thr->in_ignored_lib)941 Acquire(thr, pc, (uptr)g);942 return 0;943 } else {944 if ((cmp & kGuardWaiter) ||945 atomic_compare_exchange_strong(g, &cmp, cmp | kGuardWaiter,946 memory_order_relaxed)) {947 if (blocking_hooks && !in_potentially_blocking_region) {948 in_potentially_blocking_region = true;949 OnPotentiallyBlockingRegionBegin();950 }951 FutexWait(g, cmp | kGuardWaiter);952 }953 }954 }955}956 957static void guard_release(ThreadState *thr, uptr pc, atomic_uint32_t *g,958 u32 v) {959 if (!thr->in_ignored_lib)960 Release(thr, pc, (uptr)g);961 u32 old = atomic_exchange(g, v, memory_order_release);962 if (old & kGuardWaiter)963 FutexWake(g, 1 << 30);964}965 966// __cxa_guard_acquire and friends need to be intercepted in a special way -967// regular interceptors will break statically-linked libstdc++. Linux968// interceptors are especially defined as weak functions (so that they don't969// cause link errors when user defines them as well). So they silently970// auto-disable themselves when such symbol is already present in the binary. If971// we link libstdc++ statically, it will bring own __cxa_guard_acquire which972// will silently replace our interceptor. That's why on Linux we simply export973// these interceptors with INTERFACE_ATTRIBUTE.974// On OS X, we don't support statically linking, so we just use a regular975// interceptor.976#if SANITIZER_APPLE977#define STDCXX_INTERCEPTOR TSAN_INTERCEPTOR978#else979#define STDCXX_INTERCEPTOR(rettype, name, ...) \980 extern "C" rettype INTERFACE_ATTRIBUTE name(__VA_ARGS__)981#endif982 983// Used in thread-safe function static initialization.984STDCXX_INTERCEPTOR(int, __cxa_guard_acquire, atomic_uint32_t *g) {985 SCOPED_INTERCEPTOR_RAW(__cxa_guard_acquire, g);986 return guard_acquire(thr, pc, g);987}988 989STDCXX_INTERCEPTOR(void, __cxa_guard_release, atomic_uint32_t *g) {990 SCOPED_INTERCEPTOR_RAW(__cxa_guard_release, g);991 guard_release(thr, pc, g, kGuardDone);992}993 994STDCXX_INTERCEPTOR(void, __cxa_guard_abort, atomic_uint32_t *g) {995 SCOPED_INTERCEPTOR_RAW(__cxa_guard_abort, g);996 guard_release(thr, pc, g, kGuardInit);997}998 999namespace __tsan {1000void DestroyThreadState() {1001 ThreadState *thr = cur_thread();1002 Processor *proc = thr->proc();1003 ThreadFinish(thr);1004 ProcUnwire(proc, thr);1005 ProcDestroy(proc);1006 DTLS_Destroy();1007 cur_thread_finalize();1008}1009 1010void PlatformCleanUpThreadState(ThreadState *thr) {1011 ThreadSignalContext *sctx = (ThreadSignalContext *)atomic_load(1012 &thr->signal_ctx, memory_order_relaxed);1013 if (sctx) {1014 atomic_store(&thr->signal_ctx, 0, memory_order_relaxed);1015 sctx->oldset.Reset();1016 UnmapOrDie(sctx, sizeof(*sctx));1017 }1018}1019} // namespace __tsan1020 1021#if !SANITIZER_APPLE && !SANITIZER_NETBSD && !SANITIZER_FREEBSD1022static void thread_finalize(void *v) {1023 uptr iter = (uptr)v;1024 if (iter > 1) {1025 if (pthread_setspecific(interceptor_ctx()->finalize_key,1026 (void*)(iter - 1))) {1027 Printf("ThreadSanitizer: failed to set thread key\n");1028 Die();1029 }1030 return;1031 }1032 DestroyThreadState();1033}1034#endif1035 1036 1037struct ThreadParam {1038 void* (*callback)(void *arg);1039 void *param;1040 Tid tid;1041 Semaphore created;1042 Semaphore started;1043};1044 1045extern "C" void *__tsan_thread_start_func(void *arg) {1046 ThreadParam *p = (ThreadParam*)arg;1047 void* (*callback)(void *arg) = p->callback;1048 void *param = p->param;1049 {1050 ThreadState *thr = cur_thread_init();1051 // Thread-local state is not initialized yet.1052 ScopedIgnoreInterceptors ignore;1053#if !SANITIZER_APPLE && !SANITIZER_NETBSD && !SANITIZER_FREEBSD1054 ThreadIgnoreBegin(thr, 0);1055 if (pthread_setspecific(interceptor_ctx()->finalize_key,1056 (void *)GetPthreadDestructorIterations())) {1057 Printf("ThreadSanitizer: failed to set thread key\n");1058 Die();1059 }1060 ThreadIgnoreEnd(thr);1061#endif1062 p->created.Wait();1063 Processor *proc = ProcCreate();1064 ProcWire(proc, thr);1065 ThreadStart(thr, p->tid, GetTid(), ThreadType::Regular);1066 p->started.Post();1067 }1068 void *res = callback(param);1069 // Prevent the callback from being tail called,1070 // it mixes up stack traces.1071 volatile int foo = 42;1072 foo++;1073 return res;1074}1075 1076TSAN_INTERCEPTOR(int, pthread_create,1077 void *th, void *attr, void *(*callback)(void*), void * param) {1078 SCOPED_INTERCEPTOR_RAW(pthread_create, th, attr, callback, param);1079 1080 MaybeSpawnBackgroundThread();1081 1082 if (ctx->after_multithreaded_fork) {1083 if (flags()->die_after_fork) {1084 Report("ThreadSanitizer: starting new threads after multi-threaded "1085 "fork is not supported. Dying (set die_after_fork=0 to override)\n");1086 Die();1087 } else {1088 VPrintf(1,1089 "ThreadSanitizer: starting new threads after multi-threaded "1090 "fork is not supported (pid %lu). Continuing because of "1091 "die_after_fork=0, but you are on your own\n",1092 internal_getpid());1093 }1094 }1095 __sanitizer_pthread_attr_t myattr;1096 if (attr == 0) {1097 pthread_attr_init(&myattr);1098 attr = &myattr;1099 }1100 int detached = 0;1101 REAL(pthread_attr_getdetachstate)(attr, &detached);1102 AdjustStackSize(attr);1103 1104 ThreadParam p;1105 p.callback = callback;1106 p.param = param;1107 p.tid = kMainTid;1108 int res = -1;1109 {1110 // Otherwise we see false positives in pthread stack manipulation.1111 ScopedIgnoreInterceptors ignore;1112 ThreadIgnoreBegin(thr, pc);1113 res = REAL(pthread_create)(th, attr, __tsan_thread_start_func, &p);1114 ThreadIgnoreEnd(thr);1115 }1116 if (res == 0) {1117 p.tid = ThreadCreate(thr, pc, *(uptr *)th, IsStateDetached(detached));1118 CHECK_NE(p.tid, kMainTid);1119 // Synchronization on p.tid serves two purposes:1120 // 1. ThreadCreate must finish before the new thread starts.1121 // Otherwise the new thread can call pthread_detach, but the pthread_t1122 // identifier is not yet registered in ThreadRegistry by ThreadCreate.1123 // 2. ThreadStart must finish before this thread continues.1124 // Otherwise, this thread can call pthread_detach and reset thr->sync1125 // before the new thread got a chance to acquire from it in ThreadStart.1126 p.created.Post();1127 p.started.Wait();1128 }1129 if (attr == &myattr)1130 pthread_attr_destroy(&myattr);1131 return res;1132}1133 1134TSAN_INTERCEPTOR(int, pthread_join, void *th, void **ret) {1135 SCOPED_INTERCEPTOR_RAW(pthread_join, th, ret);1136#if SANITIZER_ANDROID1137 {1138 // In Bionic, if the target thread has already exited when pthread_detach is1139 // called, pthread_detach will call pthread_join internally to clean it up.1140 // In that case, the thread has already been consumed by the pthread_detach1141 // interceptor.1142 Tid tid = ctx->thread_registry.FindThread(1143 [](ThreadContextBase* tctx, void* arg) {1144 return tctx->user_id == (uptr)arg;1145 },1146 th);1147 if (tid == kInvalidTid) {1148 return REAL(pthread_join)(th, ret);1149 }1150 }1151#endif1152 Tid tid = ThreadConsumeTid(thr, pc, (uptr)th);1153 ThreadIgnoreBegin(thr, pc);1154 int res = BLOCK_REAL(pthread_join)(th, ret);1155 ThreadIgnoreEnd(thr);1156 if (res == 0) {1157 ThreadJoin(thr, pc, tid);1158 }1159 return res;1160}1161 1162// DEFINE_INTERNAL_PTHREAD_FUNCTIONS1163namespace __sanitizer {1164int internal_pthread_create(void *th, void *attr, void *(*callback)(void *),1165 void *param) {1166 ScopedIgnoreInterceptors ignore;1167 return REAL(pthread_create)(th, attr, callback, param);1168}1169int internal_pthread_join(void *th, void **ret) {1170 ScopedIgnoreInterceptors ignore;1171 return REAL(pthread_join)(th, ret);1172}1173} // namespace __sanitizer1174 1175TSAN_INTERCEPTOR(int, pthread_detach, void *th) {1176 SCOPED_INTERCEPTOR_RAW(pthread_detach, th);1177 Tid tid = ThreadConsumeTid(thr, pc, (uptr)th);1178 int res = REAL(pthread_detach)(th);1179 if (res == 0) {1180 ThreadDetach(thr, pc, tid);1181 }1182 return res;1183}1184 1185TSAN_INTERCEPTOR(void, pthread_exit, void *retval) {1186 {1187 SCOPED_INTERCEPTOR_RAW(pthread_exit, retval);1188#if !SANITIZER_APPLE && !SANITIZER_ANDROID1189 CHECK_EQ(thr, &cur_thread_placeholder);1190#endif1191 }1192 REAL(pthread_exit)(retval);1193}1194 1195#if SANITIZER_LINUX1196TSAN_INTERCEPTOR(int, pthread_tryjoin_np, void *th, void **ret) {1197 SCOPED_INTERCEPTOR_RAW(pthread_tryjoin_np, th, ret);1198 Tid tid = ThreadConsumeTid(thr, pc, (uptr)th);1199 ThreadIgnoreBegin(thr, pc);1200 int res = REAL(pthread_tryjoin_np)(th, ret);1201 ThreadIgnoreEnd(thr);1202 if (res == 0)1203 ThreadJoin(thr, pc, tid);1204 else1205 ThreadNotJoined(thr, pc, tid, (uptr)th);1206 return res;1207}1208 1209TSAN_INTERCEPTOR(int, pthread_timedjoin_np, void *th, void **ret,1210 const struct timespec *abstime) {1211 SCOPED_INTERCEPTOR_RAW(pthread_timedjoin_np, th, ret, abstime);1212 Tid tid = ThreadConsumeTid(thr, pc, (uptr)th);1213 ThreadIgnoreBegin(thr, pc);1214 int res = BLOCK_REAL(pthread_timedjoin_np)(th, ret, abstime);1215 ThreadIgnoreEnd(thr);1216 if (res == 0)1217 ThreadJoin(thr, pc, tid);1218 else1219 ThreadNotJoined(thr, pc, tid, (uptr)th);1220 return res;1221}1222#endif1223 1224// Problem:1225// NPTL implementation of pthread_cond has 2 versions (2.2.5 and 2.3.2).1226// pthread_cond_t has different size in the different versions.1227// If call new REAL functions for old pthread_cond_t, they will corrupt memory1228// after pthread_cond_t (old cond is smaller).1229// If we call old REAL functions for new pthread_cond_t, we will lose some1230// functionality (e.g. old functions do not support waiting against1231// CLOCK_REALTIME).1232// Proper handling would require to have 2 versions of interceptors as well.1233// But this is messy, in particular requires linker scripts when sanitizer1234// runtime is linked into a shared library.1235// Instead we assume we don't have dynamic libraries built against old1236// pthread (2.2.5 is dated by 2002). And provide legacy_pthread_cond flag1237// that allows to work with old libraries (but this mode does not support1238// some features, e.g. pthread_condattr_getpshared).1239static void *init_cond(void *c, bool force = false) {1240 // sizeof(pthread_cond_t) >= sizeof(uptr) in both versions.1241 // So we allocate additional memory on the side large enough to hold1242 // any pthread_cond_t object. Always call new REAL functions, but pass1243 // the aux object to them.1244 // Note: the code assumes that PTHREAD_COND_INITIALIZER initializes1245 // first word of pthread_cond_t to zero.1246 // It's all relevant only for linux.1247 if (!common_flags()->legacy_pthread_cond)1248 return c;1249 atomic_uintptr_t *p = (atomic_uintptr_t*)c;1250 uptr cond = atomic_load(p, memory_order_acquire);1251 if (!force && cond != 0)1252 return (void*)cond;1253 void *newcond = WRAP(malloc)(pthread_cond_t_sz);1254 internal_memset(newcond, 0, pthread_cond_t_sz);1255 if (atomic_compare_exchange_strong(p, &cond, (uptr)newcond,1256 memory_order_acq_rel))1257 return newcond;1258 WRAP(free)(newcond);1259 return (void*)cond;1260}1261 1262namespace {1263 1264template <class Fn>1265struct CondMutexUnlockCtx {1266 ScopedInterceptor *si;1267 ThreadState *thr;1268 uptr pc;1269 void *m;1270 void *c;1271 const Fn &fn;1272 1273 int Cancel() const { return fn(); }1274 void Unlock() const;1275};1276 1277template <class Fn>1278void CondMutexUnlockCtx<Fn>::Unlock() const {1279 // pthread_cond_wait interceptor has enabled async signal delivery1280 // (see BlockingCall below). Disable async signals since we are running1281 // tsan code. Also ScopedInterceptor and BlockingCall destructors won't run1282 // since the thread is cancelled, so we have to manually execute them1283 // (the thread still can run some user code due to pthread_cleanup_push).1284 CHECK_EQ(atomic_load(&thr->in_blocking_func, memory_order_relaxed), 1);1285 atomic_store(&thr->in_blocking_func, 0, memory_order_relaxed);1286 MutexPostLock(thr, pc, (uptr)m, MutexFlagDoPreLockOnPostLock);1287 // Undo BlockingCall ctor effects.1288 thr->ignore_interceptors--;1289 si->~ScopedInterceptor();1290}1291} // namespace1292 1293INTERCEPTOR(int, pthread_cond_init, void *c, void *a) {1294 void *cond = init_cond(c, true);1295 SCOPED_TSAN_INTERCEPTOR(pthread_cond_init, cond, a);1296 MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), true);1297 return REAL(pthread_cond_init)(cond, a);1298}1299 1300template <class Fn>1301int cond_wait(ThreadState *thr, uptr pc, ScopedInterceptor *si, const Fn &fn,1302 void *c, void *m) {1303 MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), false);1304 MutexUnlock(thr, pc, (uptr)m);1305 int res = 0;1306 // This ensures that we handle mutex lock even in case of pthread_cancel.1307 // See test/tsan/cond_cancel.cpp.1308 {1309 // Enable signal delivery while the thread is blocked.1310 BlockingCall bc(thr);1311 CondMutexUnlockCtx<Fn> arg = {si, thr, pc, m, c, fn};1312 res = call_pthread_cancel_with_cleanup(1313 [](void *arg) -> int {1314 return ((const CondMutexUnlockCtx<Fn> *)arg)->Cancel();1315 },1316 [](void *arg) { ((const CondMutexUnlockCtx<Fn> *)arg)->Unlock(); },1317 &arg);1318 }1319 if (res == errno_EOWNERDEAD) MutexRepair(thr, pc, (uptr)m);1320 MutexPostLock(thr, pc, (uptr)m, MutexFlagDoPreLockOnPostLock);1321 return res;1322}1323 1324INTERCEPTOR(int, pthread_cond_wait, void *c, void *m) {1325 void *cond = init_cond(c);1326 SCOPED_TSAN_INTERCEPTOR(pthread_cond_wait, cond, m);1327 return cond_wait(1328 thr, pc, &si, [=]() { return REAL(pthread_cond_wait)(cond, m); }, cond,1329 m);1330}1331 1332INTERCEPTOR(int, pthread_cond_timedwait, void *c, void *m, void *abstime) {1333 void *cond = init_cond(c);1334 SCOPED_TSAN_INTERCEPTOR(pthread_cond_timedwait, cond, m, abstime);1335 return cond_wait(1336 thr, pc, &si,1337 [=]() { return REAL(pthread_cond_timedwait)(cond, m, abstime); }, cond,1338 m);1339}1340 1341#if SANITIZER_LINUX1342INTERCEPTOR(int, pthread_cond_clockwait, void *c, void *m,1343 __sanitizer_clockid_t clock, void *abstime) {1344 void *cond = init_cond(c);1345 SCOPED_TSAN_INTERCEPTOR(pthread_cond_clockwait, cond, m, clock, abstime);1346 return cond_wait(1347 thr, pc, &si,1348 [=]() { return REAL(pthread_cond_clockwait)(cond, m, clock, abstime); },1349 cond, m);1350}1351#define TSAN_MAYBE_PTHREAD_COND_CLOCKWAIT TSAN_INTERCEPT(pthread_cond_clockwait)1352#else1353#define TSAN_MAYBE_PTHREAD_COND_CLOCKWAIT1354#endif1355 1356#if SANITIZER_APPLE1357INTERCEPTOR(int, pthread_cond_timedwait_relative_np, void *c, void *m,1358 void *reltime) {1359 void *cond = init_cond(c);1360 SCOPED_TSAN_INTERCEPTOR(pthread_cond_timedwait_relative_np, cond, m, reltime);1361 return cond_wait(1362 thr, pc, &si,1363 [=]() {1364 return REAL(pthread_cond_timedwait_relative_np)(cond, m, reltime);1365 },1366 cond, m);1367}1368#endif1369 1370INTERCEPTOR(int, pthread_cond_signal, void *c) {1371 void *cond = init_cond(c);1372 SCOPED_TSAN_INTERCEPTOR(pthread_cond_signal, cond);1373 MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), false);1374 return REAL(pthread_cond_signal)(cond);1375}1376 1377INTERCEPTOR(int, pthread_cond_broadcast, void *c) {1378 void *cond = init_cond(c);1379 SCOPED_TSAN_INTERCEPTOR(pthread_cond_broadcast, cond);1380 MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), false);1381 return REAL(pthread_cond_broadcast)(cond);1382}1383 1384INTERCEPTOR(int, pthread_cond_destroy, void *c) {1385 void *cond = init_cond(c);1386 SCOPED_TSAN_INTERCEPTOR(pthread_cond_destroy, cond);1387 MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), true);1388 int res = REAL(pthread_cond_destroy)(cond);1389 if (common_flags()->legacy_pthread_cond) {1390 // Free our aux cond and zero the pointer to not leave dangling pointers.1391 WRAP(free)(cond);1392 atomic_store((atomic_uintptr_t*)c, 0, memory_order_relaxed);1393 }1394 return res;1395}1396 1397TSAN_INTERCEPTOR(int, pthread_mutex_init, void *m, void *a) {1398 SCOPED_TSAN_INTERCEPTOR(pthread_mutex_init, m, a);1399 int res = REAL(pthread_mutex_init)(m, a);1400 if (res == 0) {1401 u32 flagz = 0;1402 if (a) {1403 int type = 0;1404 if (REAL(pthread_mutexattr_gettype)(a, &type) == 0)1405 if (type == PTHREAD_MUTEX_RECURSIVE ||1406 type == PTHREAD_MUTEX_RECURSIVE_NP)1407 flagz |= MutexFlagWriteReentrant;1408 }1409 MutexCreate(thr, pc, (uptr)m, flagz);1410 }1411 return res;1412}1413 1414TSAN_INTERCEPTOR(int, pthread_mutex_destroy, void *m) {1415 SCOPED_TSAN_INTERCEPTOR(pthread_mutex_destroy, m);1416 int res = REAL(pthread_mutex_destroy)(m);1417 if (res == 0 || res == errno_EBUSY) {1418 MutexDestroy(thr, pc, (uptr)m);1419 }1420 return res;1421}1422 1423TSAN_INTERCEPTOR(int, pthread_mutex_lock, void *m) {1424 SCOPED_TSAN_INTERCEPTOR(pthread_mutex_lock, m);1425 MutexPreLock(thr, pc, (uptr)m);1426 int res = BLOCK_REAL(pthread_mutex_lock)(m);1427 if (res == errno_EOWNERDEAD)1428 MutexRepair(thr, pc, (uptr)m);1429 if (res == 0 || res == errno_EOWNERDEAD)1430 MutexPostLock(thr, pc, (uptr)m);1431 if (res == errno_EINVAL)1432 MutexInvalidAccess(thr, pc, (uptr)m);1433 return res;1434}1435 1436TSAN_INTERCEPTOR(int, pthread_mutex_trylock, void *m) {1437 SCOPED_TSAN_INTERCEPTOR(pthread_mutex_trylock, m);1438 int res = REAL(pthread_mutex_trylock)(m);1439 if (res == errno_EOWNERDEAD)1440 MutexRepair(thr, pc, (uptr)m);1441 if (res == 0 || res == errno_EOWNERDEAD)1442 MutexPostLock(thr, pc, (uptr)m, MutexFlagTryLock);1443 return res;1444}1445 1446#if !SANITIZER_APPLE1447TSAN_INTERCEPTOR(int, pthread_mutex_timedlock, void *m, void *abstime) {1448 SCOPED_TSAN_INTERCEPTOR(pthread_mutex_timedlock, m, abstime);1449 int res = REAL(pthread_mutex_timedlock)(m, abstime);1450 if (res == 0) {1451 MutexPostLock(thr, pc, (uptr)m, MutexFlagTryLock);1452 }1453 return res;1454}1455#endif1456 1457TSAN_INTERCEPTOR(int, pthread_mutex_unlock, void *m) {1458 SCOPED_TSAN_INTERCEPTOR(pthread_mutex_unlock, m);1459 MutexUnlock(thr, pc, (uptr)m);1460 int res = REAL(pthread_mutex_unlock)(m);1461 if (res == errno_EINVAL)1462 MutexInvalidAccess(thr, pc, (uptr)m);1463 return res;1464}1465 1466#if SANITIZER_LINUX1467TSAN_INTERCEPTOR(int, pthread_mutex_clocklock, void *m,1468 __sanitizer_clockid_t clock, void *abstime) {1469 SCOPED_TSAN_INTERCEPTOR(pthread_mutex_clocklock, m, clock, abstime);1470 MutexPreLock(thr, pc, (uptr)m);1471 int res = BLOCK_REAL(pthread_mutex_clocklock)(m, clock, abstime);1472 if (res == errno_EOWNERDEAD)1473 MutexRepair(thr, pc, (uptr)m);1474 if (res == 0 || res == errno_EOWNERDEAD)1475 MutexPostLock(thr, pc, (uptr)m);1476 if (res == errno_EINVAL)1477 MutexInvalidAccess(thr, pc, (uptr)m);1478 return res;1479}1480#endif1481 1482#if SANITIZER_GLIBC1483# if !__GLIBC_PREREQ(2, 34)1484// glibc 2.34 applies a non-default version for the two functions. They are no1485// longer expected to be intercepted by programs.1486TSAN_INTERCEPTOR(int, __pthread_mutex_lock, void *m) {1487 SCOPED_TSAN_INTERCEPTOR(__pthread_mutex_lock, m);1488 MutexPreLock(thr, pc, (uptr)m);1489 int res = BLOCK_REAL(__pthread_mutex_lock)(m);1490 if (res == errno_EOWNERDEAD)1491 MutexRepair(thr, pc, (uptr)m);1492 if (res == 0 || res == errno_EOWNERDEAD)1493 MutexPostLock(thr, pc, (uptr)m);1494 if (res == errno_EINVAL)1495 MutexInvalidAccess(thr, pc, (uptr)m);1496 return res;1497}1498 1499TSAN_INTERCEPTOR(int, __pthread_mutex_unlock, void *m) {1500 SCOPED_TSAN_INTERCEPTOR(__pthread_mutex_unlock, m);1501 MutexUnlock(thr, pc, (uptr)m);1502 int res = REAL(__pthread_mutex_unlock)(m);1503 if (res == errno_EINVAL)1504 MutexInvalidAccess(thr, pc, (uptr)m);1505 return res;1506}1507# endif1508#endif1509 1510#if !SANITIZER_APPLE1511TSAN_INTERCEPTOR(int, pthread_spin_init, void *m, int pshared) {1512 SCOPED_TSAN_INTERCEPTOR(pthread_spin_init, m, pshared);1513 int res = REAL(pthread_spin_init)(m, pshared);1514 if (res == 0) {1515 MutexCreate(thr, pc, (uptr)m);1516 }1517 return res;1518}1519 1520TSAN_INTERCEPTOR(int, pthread_spin_destroy, void *m) {1521 SCOPED_TSAN_INTERCEPTOR(pthread_spin_destroy, m);1522 int res = REAL(pthread_spin_destroy)(m);1523 if (res == 0) {1524 MutexDestroy(thr, pc, (uptr)m);1525 }1526 return res;1527}1528 1529TSAN_INTERCEPTOR(int, pthread_spin_lock, void *m) {1530 SCOPED_TSAN_INTERCEPTOR(pthread_spin_lock, m);1531 MutexPreLock(thr, pc, (uptr)m);1532 int res = BLOCK_REAL(pthread_spin_lock)(m);1533 if (res == 0) {1534 MutexPostLock(thr, pc, (uptr)m);1535 }1536 return res;1537}1538 1539TSAN_INTERCEPTOR(int, pthread_spin_trylock, void *m) {1540 SCOPED_TSAN_INTERCEPTOR(pthread_spin_trylock, m);1541 int res = REAL(pthread_spin_trylock)(m);1542 if (res == 0) {1543 MutexPostLock(thr, pc, (uptr)m, MutexFlagTryLock);1544 }1545 return res;1546}1547 1548TSAN_INTERCEPTOR(int, pthread_spin_unlock, void *m) {1549 SCOPED_TSAN_INTERCEPTOR(pthread_spin_unlock, m);1550 MutexUnlock(thr, pc, (uptr)m);1551 int res = REAL(pthread_spin_unlock)(m);1552 return res;1553}1554#endif1555 1556TSAN_INTERCEPTOR(int, pthread_rwlock_init, void *m, void *a) {1557 SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_init, m, a);1558 int res = REAL(pthread_rwlock_init)(m, a);1559 if (res == 0) {1560 MutexCreate(thr, pc, (uptr)m);1561 }1562 return res;1563}1564 1565TSAN_INTERCEPTOR(int, pthread_rwlock_destroy, void *m) {1566 SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_destroy, m);1567 int res = REAL(pthread_rwlock_destroy)(m);1568 if (res == 0) {1569 MutexDestroy(thr, pc, (uptr)m);1570 }1571 return res;1572}1573 1574TSAN_INTERCEPTOR(int, pthread_rwlock_rdlock, void *m) {1575 SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_rdlock, m);1576 MutexPreReadLock(thr, pc, (uptr)m);1577 int res = REAL(pthread_rwlock_rdlock)(m);1578 if (res == 0) {1579 MutexPostReadLock(thr, pc, (uptr)m);1580 }1581 return res;1582}1583 1584TSAN_INTERCEPTOR(int, pthread_rwlock_tryrdlock, void *m) {1585 SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_tryrdlock, m);1586 int res = REAL(pthread_rwlock_tryrdlock)(m);1587 if (res == 0) {1588 MutexPostReadLock(thr, pc, (uptr)m, MutexFlagTryLock);1589 }1590 return res;1591}1592 1593#if !SANITIZER_APPLE1594TSAN_INTERCEPTOR(int, pthread_rwlock_timedrdlock, void *m, void *abstime) {1595 SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedrdlock, m, abstime);1596 int res = REAL(pthread_rwlock_timedrdlock)(m, abstime);1597 if (res == 0) {1598 MutexPostReadLock(thr, pc, (uptr)m);1599 }1600 return res;1601}1602#endif1603 1604TSAN_INTERCEPTOR(int, pthread_rwlock_wrlock, void *m) {1605 SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_wrlock, m);1606 MutexPreLock(thr, pc, (uptr)m);1607 int res = BLOCK_REAL(pthread_rwlock_wrlock)(m);1608 if (res == 0) {1609 MutexPostLock(thr, pc, (uptr)m);1610 }1611 return res;1612}1613 1614TSAN_INTERCEPTOR(int, pthread_rwlock_trywrlock, void *m) {1615 SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_trywrlock, m);1616 int res = REAL(pthread_rwlock_trywrlock)(m);1617 if (res == 0) {1618 MutexPostLock(thr, pc, (uptr)m, MutexFlagTryLock);1619 }1620 return res;1621}1622 1623#if !SANITIZER_APPLE1624TSAN_INTERCEPTOR(int, pthread_rwlock_timedwrlock, void *m, void *abstime) {1625 SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedwrlock, m, abstime);1626 int res = REAL(pthread_rwlock_timedwrlock)(m, abstime);1627 if (res == 0) {1628 MutexPostLock(thr, pc, (uptr)m, MutexFlagTryLock);1629 }1630 return res;1631}1632#endif1633 1634TSAN_INTERCEPTOR(int, pthread_rwlock_unlock, void *m) {1635 SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_unlock, m);1636 MutexReadOrWriteUnlock(thr, pc, (uptr)m);1637 int res = REAL(pthread_rwlock_unlock)(m);1638 return res;1639}1640 1641#if !SANITIZER_APPLE1642TSAN_INTERCEPTOR(int, pthread_barrier_init, void *b, void *a, unsigned count) {1643 SCOPED_TSAN_INTERCEPTOR(pthread_barrier_init, b, a, count);1644 MemoryAccess(thr, pc, (uptr)b, 1, kAccessWrite);1645 int res = REAL(pthread_barrier_init)(b, a, count);1646 return res;1647}1648 1649TSAN_INTERCEPTOR(int, pthread_barrier_destroy, void *b) {1650 SCOPED_TSAN_INTERCEPTOR(pthread_barrier_destroy, b);1651 MemoryAccess(thr, pc, (uptr)b, 1, kAccessWrite);1652 int res = REAL(pthread_barrier_destroy)(b);1653 return res;1654}1655 1656TSAN_INTERCEPTOR(int, pthread_barrier_wait, void *b) {1657 SCOPED_TSAN_INTERCEPTOR(pthread_barrier_wait, b);1658 Release(thr, pc, (uptr)b);1659 MemoryAccess(thr, pc, (uptr)b, 1, kAccessRead);1660 int res = REAL(pthread_barrier_wait)(b);1661 MemoryAccess(thr, pc, (uptr)b, 1, kAccessRead);1662 if (res == 0 || res == PTHREAD_BARRIER_SERIAL_THREAD) {1663 Acquire(thr, pc, (uptr)b);1664 }1665 return res;1666}1667#endif1668 1669TSAN_INTERCEPTOR(int, pthread_once, void *o, void (*f)()) {1670 SCOPED_INTERCEPTOR_RAW(pthread_once, o, f);1671#if SANITIZER_APPLE && !SANITIZER_GO1672 if (flags()->lock_during_write != kLockDuringAllWrites &&1673 cur_thread_init()->in_internal_write_call) {1674 // This is needed to make it through process launch without hanging1675 f();1676 return 0;1677 }1678#endif1679 if (o == 0 || f == 0)1680 return errno_EINVAL;1681 atomic_uint32_t *a;1682 1683 if (SANITIZER_APPLE)1684 a = static_cast<atomic_uint32_t*>((void *)((char *)o + sizeof(long_t)));1685 else if (SANITIZER_NETBSD)1686 a = static_cast<atomic_uint32_t*>1687 ((void *)((char *)o + __sanitizer::pthread_mutex_t_sz));1688 else1689 a = static_cast<atomic_uint32_t*>(o);1690 1691 // Mac OS X appears to use pthread_once() where calling BlockingRegion hooks1692 // result in crashes due to too little stack space.1693 if (guard_acquire(thr, pc, a, !SANITIZER_APPLE)) {1694 (*f)();1695 guard_release(thr, pc, a, kGuardDone);1696 }1697 return 0;1698}1699 1700#if SANITIZER_GLIBC1701TSAN_INTERCEPTOR(int, __fxstat, int version, int fd, void *buf) {1702 SCOPED_TSAN_INTERCEPTOR(__fxstat, version, fd, buf);1703 if (fd > 0)1704 FdAccess(thr, pc, fd);1705 return REAL(__fxstat)(version, fd, buf);1706}1707 1708TSAN_INTERCEPTOR(int, __fxstat64, int version, int fd, void *buf) {1709 SCOPED_TSAN_INTERCEPTOR(__fxstat64, version, fd, buf);1710 if (fd > 0)1711 FdAccess(thr, pc, fd);1712 return REAL(__fxstat64)(version, fd, buf);1713}1714#define TSAN_MAYBE_INTERCEPT___FXSTAT TSAN_INTERCEPT(__fxstat); TSAN_INTERCEPT(__fxstat64)1715#else1716#define TSAN_MAYBE_INTERCEPT___FXSTAT1717#endif1718 1719#if !SANITIZER_GLIBC || __GLIBC_PREREQ(2, 33)1720TSAN_INTERCEPTOR(int, fstat, int fd, void *buf) {1721 SCOPED_TSAN_INTERCEPTOR(fstat, fd, buf);1722 if (fd > 0)1723 FdAccess(thr, pc, fd);1724 return REAL(fstat)(fd, buf);1725}1726# define TSAN_MAYBE_INTERCEPT_FSTAT TSAN_INTERCEPT(fstat)1727#else1728# define TSAN_MAYBE_INTERCEPT_FSTAT1729#endif1730 1731#if __GLIBC_PREREQ(2, 33)1732TSAN_INTERCEPTOR(int, fstat64, int fd, void *buf) {1733 SCOPED_TSAN_INTERCEPTOR(fstat64, fd, buf);1734 if (fd > 0)1735 FdAccess(thr, pc, fd);1736 return REAL(fstat64)(fd, buf);1737}1738# define TSAN_MAYBE_INTERCEPT_FSTAT64 TSAN_INTERCEPT(fstat64)1739#else1740# define TSAN_MAYBE_INTERCEPT_FSTAT641741#endif1742 1743TSAN_INTERCEPTOR(int, open, const char *name, int oflag, ...) {1744 mode_t mode = 0;1745 if (OpenReadsVaArgs(oflag)) {1746 va_list ap;1747 va_start(ap, oflag);1748 mode = va_arg(ap, int);1749 va_end(ap);1750 }1751 1752 SCOPED_TSAN_INTERCEPTOR(open, name, oflag, mode);1753 READ_STRING(thr, pc, name, 0);1754 1755 int fd;1756 if (OpenReadsVaArgs(oflag))1757 fd = REAL(open)(name, oflag, mode);1758 else1759 fd = REAL(open)(name, oflag);1760 1761 if (fd >= 0)1762 FdFileCreate(thr, pc, fd);1763 return fd;1764}1765 1766#if SANITIZER_LINUX1767TSAN_INTERCEPTOR(int, open64, const char *name, int oflag, ...) {1768 va_list ap;1769 va_start(ap, oflag);1770 mode_t mode = va_arg(ap, int);1771 va_end(ap);1772 SCOPED_TSAN_INTERCEPTOR(open64, name, oflag, mode);1773 READ_STRING(thr, pc, name, 0);1774 int fd = REAL(open64)(name, oflag, mode);1775 if (fd >= 0)1776 FdFileCreate(thr, pc, fd);1777 return fd;1778}1779#define TSAN_MAYBE_INTERCEPT_OPEN64 TSAN_INTERCEPT(open64)1780#else1781#define TSAN_MAYBE_INTERCEPT_OPEN641782#endif1783 1784TSAN_INTERCEPTOR(int, creat, const char *name, int mode) {1785 SCOPED_TSAN_INTERCEPTOR(creat, name, mode);1786 READ_STRING(thr, pc, name, 0);1787 int fd = REAL(creat)(name, mode);1788 if (fd >= 0)1789 FdFileCreate(thr, pc, fd);1790 return fd;1791}1792 1793#if SANITIZER_LINUX1794TSAN_INTERCEPTOR(int, creat64, const char *name, int mode) {1795 SCOPED_TSAN_INTERCEPTOR(creat64, name, mode);1796 READ_STRING(thr, pc, name, 0);1797 int fd = REAL(creat64)(name, mode);1798 if (fd >= 0)1799 FdFileCreate(thr, pc, fd);1800 return fd;1801}1802#define TSAN_MAYBE_INTERCEPT_CREAT64 TSAN_INTERCEPT(creat64)1803#else1804#define TSAN_MAYBE_INTERCEPT_CREAT641805#endif1806 1807TSAN_INTERCEPTOR(int, dup, int oldfd) {1808 SCOPED_TSAN_INTERCEPTOR(dup, oldfd);1809 int newfd = REAL(dup)(oldfd);1810 if (oldfd >= 0 && newfd >= 0 && newfd != oldfd)1811 FdDup(thr, pc, oldfd, newfd, true);1812 return newfd;1813}1814 1815TSAN_INTERCEPTOR(int, dup2, int oldfd, int newfd) {1816 SCOPED_TSAN_INTERCEPTOR(dup2, oldfd, newfd);1817 int newfd2 = REAL(dup2)(oldfd, newfd);1818 if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)1819 FdDup(thr, pc, oldfd, newfd2, false);1820 return newfd2;1821}1822 1823#if !SANITIZER_APPLE1824TSAN_INTERCEPTOR(int, dup3, int oldfd, int newfd, int flags) {1825 SCOPED_TSAN_INTERCEPTOR(dup3, oldfd, newfd, flags);1826 int newfd2 = REAL(dup3)(oldfd, newfd, flags);1827 if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)1828 FdDup(thr, pc, oldfd, newfd2, false);1829 return newfd2;1830}1831#endif1832 1833#if SANITIZER_LINUX1834TSAN_INTERCEPTOR(int, eventfd, unsigned initval, int flags) {1835 SCOPED_TSAN_INTERCEPTOR(eventfd, initval, flags);1836 int fd = REAL(eventfd)(initval, flags);1837 if (fd >= 0)1838 FdEventCreate(thr, pc, fd);1839 return fd;1840}1841#define TSAN_MAYBE_INTERCEPT_EVENTFD TSAN_INTERCEPT(eventfd)1842#else1843#define TSAN_MAYBE_INTERCEPT_EVENTFD1844#endif1845 1846#if SANITIZER_LINUX1847TSAN_INTERCEPTOR(int, signalfd, int fd, void *mask, int flags) {1848 SCOPED_INTERCEPTOR_RAW(signalfd, fd, mask, flags);1849 FdClose(thr, pc, fd);1850 fd = REAL(signalfd)(fd, mask, flags);1851 if (!MustIgnoreInterceptor(thr))1852 FdSignalCreate(thr, pc, fd);1853 return fd;1854}1855#define TSAN_MAYBE_INTERCEPT_SIGNALFD TSAN_INTERCEPT(signalfd)1856#else1857#define TSAN_MAYBE_INTERCEPT_SIGNALFD1858#endif1859 1860#if SANITIZER_LINUX1861TSAN_INTERCEPTOR(int, inotify_init, int fake) {1862 SCOPED_TSAN_INTERCEPTOR(inotify_init, fake);1863 int fd = REAL(inotify_init)(fake);1864 if (fd >= 0)1865 FdInotifyCreate(thr, pc, fd);1866 return fd;1867}1868#define TSAN_MAYBE_INTERCEPT_INOTIFY_INIT TSAN_INTERCEPT(inotify_init)1869#else1870#define TSAN_MAYBE_INTERCEPT_INOTIFY_INIT1871#endif1872 1873#if SANITIZER_LINUX1874TSAN_INTERCEPTOR(int, inotify_init1, int flags) {1875 SCOPED_TSAN_INTERCEPTOR(inotify_init1, flags);1876 int fd = REAL(inotify_init1)(flags);1877 if (fd >= 0)1878 FdInotifyCreate(thr, pc, fd);1879 return fd;1880}1881#define TSAN_MAYBE_INTERCEPT_INOTIFY_INIT1 TSAN_INTERCEPT(inotify_init1)1882#else1883#define TSAN_MAYBE_INTERCEPT_INOTIFY_INIT11884#endif1885 1886TSAN_INTERCEPTOR(int, socket, int domain, int type, int protocol) {1887 SCOPED_TSAN_INTERCEPTOR(socket, domain, type, protocol);1888 int fd = REAL(socket)(domain, type, protocol);1889 if (fd >= 0)1890 FdSocketCreate(thr, pc, fd);1891 return fd;1892}1893 1894TSAN_INTERCEPTOR(int, socketpair, int domain, int type, int protocol, int *fd) {1895 SCOPED_TSAN_INTERCEPTOR(socketpair, domain, type, protocol, fd);1896 int res = REAL(socketpair)(domain, type, protocol, fd);1897 if (res == 0 && fd[0] >= 0 && fd[1] >= 0)1898 FdPipeCreate(thr, pc, fd[0], fd[1]);1899 return res;1900}1901 1902TSAN_INTERCEPTOR(int, connect, int fd, void *addr, unsigned addrlen) {1903 SCOPED_TSAN_INTERCEPTOR(connect, fd, addr, addrlen);1904 FdSocketConnecting(thr, pc, fd);1905 int res = REAL(connect)(fd, addr, addrlen);1906 if (res == 0 && fd >= 0)1907 FdSocketConnect(thr, pc, fd);1908 return res;1909}1910 1911TSAN_INTERCEPTOR(int, bind, int fd, void *addr, unsigned addrlen) {1912 SCOPED_TSAN_INTERCEPTOR(bind, fd, addr, addrlen);1913 int res = REAL(bind)(fd, addr, addrlen);1914 if (fd > 0 && res == 0)1915 FdAccess(thr, pc, fd);1916 return res;1917}1918 1919TSAN_INTERCEPTOR(int, listen, int fd, int backlog) {1920 SCOPED_TSAN_INTERCEPTOR(listen, fd, backlog);1921 int res = REAL(listen)(fd, backlog);1922 if (fd > 0 && res == 0)1923 FdAccess(thr, pc, fd);1924 return res;1925}1926 1927TSAN_INTERCEPTOR(int, close, int fd) {1928 SCOPED_INTERCEPTOR_RAW(close, fd);1929 if (!in_symbolizer())1930 FdClose(thr, pc, fd);1931 return REAL(close)(fd);1932}1933 1934#if SANITIZER_LINUX1935TSAN_INTERCEPTOR(int, __close, int fd) {1936 SCOPED_INTERCEPTOR_RAW(__close, fd);1937 FdClose(thr, pc, fd);1938 return REAL(__close)(fd);1939}1940#define TSAN_MAYBE_INTERCEPT___CLOSE TSAN_INTERCEPT(__close)1941#else1942#define TSAN_MAYBE_INTERCEPT___CLOSE1943#endif1944 1945// glibc guts1946#if SANITIZER_LINUX && !SANITIZER_ANDROID1947TSAN_INTERCEPTOR(void, __res_iclose, void *state, bool free_addr) {1948 SCOPED_INTERCEPTOR_RAW(__res_iclose, state, free_addr);1949 int fds[64];1950 int cnt = ExtractResolvFDs(state, fds, ARRAY_SIZE(fds));1951 for (int i = 0; i < cnt; i++) FdClose(thr, pc, fds[i]);1952 REAL(__res_iclose)(state, free_addr);1953}1954#define TSAN_MAYBE_INTERCEPT___RES_ICLOSE TSAN_INTERCEPT(__res_iclose)1955#else1956#define TSAN_MAYBE_INTERCEPT___RES_ICLOSE1957#endif1958 1959TSAN_INTERCEPTOR(int, pipe, int *pipefd) {1960 SCOPED_TSAN_INTERCEPTOR(pipe, pipefd);1961 int res = REAL(pipe)(pipefd);1962 if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)1963 FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);1964 return res;1965}1966 1967#if !SANITIZER_APPLE1968TSAN_INTERCEPTOR(int, pipe2, int *pipefd, int flags) {1969 SCOPED_TSAN_INTERCEPTOR(pipe2, pipefd, flags);1970 int res = REAL(pipe2)(pipefd, flags);1971 if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)1972 FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);1973 return res;1974}1975#endif1976 1977TSAN_INTERCEPTOR(int, unlink, char *path) {1978 SCOPED_TSAN_INTERCEPTOR(unlink, path);1979 Release(thr, pc, File2addr(path));1980 int res = REAL(unlink)(path);1981 return res;1982}1983 1984TSAN_INTERCEPTOR(void*, tmpfile, int fake) {1985 SCOPED_TSAN_INTERCEPTOR(tmpfile, fake);1986 void *res = REAL(tmpfile)(fake);1987 if (res) {1988 int fd = fileno_unlocked(res);1989 if (fd >= 0)1990 FdFileCreate(thr, pc, fd);1991 }1992 return res;1993}1994 1995#if SANITIZER_LINUX1996TSAN_INTERCEPTOR(void*, tmpfile64, int fake) {1997 SCOPED_TSAN_INTERCEPTOR(tmpfile64, fake);1998 void *res = REAL(tmpfile64)(fake);1999 if (res) {2000 int fd = fileno_unlocked(res);2001 if (fd >= 0)2002 FdFileCreate(thr, pc, fd);2003 }2004 return res;2005}2006#define TSAN_MAYBE_INTERCEPT_TMPFILE64 TSAN_INTERCEPT(tmpfile64)2007#else2008#define TSAN_MAYBE_INTERCEPT_TMPFILE642009#endif2010 2011static void FlushStreams() {2012 // Flushing all the streams here may freeze the process if a child thread is2013 // performing file stream operations at the same time.2014 REAL(fflush)(stdout);2015 REAL(fflush)(stderr);2016}2017 2018TSAN_INTERCEPTOR(void, abort, int fake) {2019 SCOPED_TSAN_INTERCEPTOR(abort, fake);2020 FlushStreams();2021 REAL(abort)(fake);2022}2023 2024TSAN_INTERCEPTOR(int, rmdir, char *path) {2025 SCOPED_TSAN_INTERCEPTOR(rmdir, path);2026 Release(thr, pc, Dir2addr(path));2027 int res = REAL(rmdir)(path);2028 return res;2029}2030 2031TSAN_INTERCEPTOR(int, closedir, void *dirp) {2032 SCOPED_INTERCEPTOR_RAW(closedir, dirp);2033 if (dirp) {2034 int fd = dirfd(dirp);2035 FdClose(thr, pc, fd);2036 }2037 return REAL(closedir)(dirp);2038}2039 2040#if SANITIZER_LINUX2041TSAN_INTERCEPTOR(int, epoll_create, int size) {2042 SCOPED_TSAN_INTERCEPTOR(epoll_create, size);2043 int fd = REAL(epoll_create)(size);2044 if (fd >= 0)2045 FdPollCreate(thr, pc, fd);2046 return fd;2047}2048 2049TSAN_INTERCEPTOR(int, epoll_create1, int flags) {2050 SCOPED_TSAN_INTERCEPTOR(epoll_create1, flags);2051 int fd = REAL(epoll_create1)(flags);2052 if (fd >= 0)2053 FdPollCreate(thr, pc, fd);2054 return fd;2055}2056 2057TSAN_INTERCEPTOR(int, epoll_ctl, int epfd, int op, int fd, void *ev) {2058 SCOPED_TSAN_INTERCEPTOR(epoll_ctl, epfd, op, fd, ev);2059 if (epfd >= 0)2060 FdAccess(thr, pc, epfd);2061 if (epfd >= 0 && fd >= 0)2062 FdAccess(thr, pc, fd);2063 if (op == EPOLL_CTL_ADD && epfd >= 0) {2064 FdPollAdd(thr, pc, epfd, fd);2065 FdRelease(thr, pc, epfd);2066 }2067 int res = REAL(epoll_ctl)(epfd, op, fd, ev);2068 return res;2069}2070 2071TSAN_INTERCEPTOR(int, epoll_wait, int epfd, void *ev, int cnt, int timeout) {2072 SCOPED_TSAN_INTERCEPTOR(epoll_wait, epfd, ev, cnt, timeout);2073 if (epfd >= 0)2074 FdAccess(thr, pc, epfd);2075 int res = BLOCK_REAL(epoll_wait)(epfd, ev, cnt, timeout);2076 if (res > 0 && epfd >= 0)2077 FdAcquire(thr, pc, epfd);2078 return res;2079}2080 2081TSAN_INTERCEPTOR(int, epoll_pwait, int epfd, void *ev, int cnt, int timeout,2082 void *sigmask) {2083 SCOPED_TSAN_INTERCEPTOR(epoll_pwait, epfd, ev, cnt, timeout, sigmask);2084 if (epfd >= 0)2085 FdAccess(thr, pc, epfd);2086 int res = BLOCK_REAL(epoll_pwait)(epfd, ev, cnt, timeout, sigmask);2087 if (res > 0 && epfd >= 0)2088 FdAcquire(thr, pc, epfd);2089 return res;2090}2091 2092TSAN_INTERCEPTOR(int, epoll_pwait2, int epfd, void *ev, int cnt, void *timeout,2093 void *sigmask) {2094 SCOPED_INTERCEPTOR_RAW(epoll_pwait2, epfd, ev, cnt, timeout, sigmask);2095 // This function is new and may not be present in libc and/or kernel.2096 // Since we effectively add it to libc (as will be probed by the program2097 // using dlsym or a weak function pointer) we need to handle the case2098 // when it's not present in the actual libc.2099 if (!REAL(epoll_pwait2)) {2100 errno = errno_ENOSYS;2101 return -1;2102 }2103 if (MustIgnoreInterceptor(thr))2104 REAL(epoll_pwait2)(epfd, ev, cnt, timeout, sigmask);2105 if (epfd >= 0)2106 FdAccess(thr, pc, epfd);2107 int res = BLOCK_REAL(epoll_pwait2)(epfd, ev, cnt, timeout, sigmask);2108 if (res > 0 && epfd >= 0)2109 FdAcquire(thr, pc, epfd);2110 return res;2111}2112 2113# define TSAN_MAYBE_INTERCEPT_EPOLL \2114 TSAN_INTERCEPT(epoll_create); \2115 TSAN_INTERCEPT(epoll_create1); \2116 TSAN_INTERCEPT(epoll_ctl); \2117 TSAN_INTERCEPT(epoll_wait); \2118 TSAN_INTERCEPT(epoll_pwait); \2119 TSAN_INTERCEPT(epoll_pwait2)2120#else2121#define TSAN_MAYBE_INTERCEPT_EPOLL2122#endif2123 2124// The following functions are intercepted merely to process pending signals.2125// If program blocks signal X, we must deliver the signal before the function2126// returns. Similarly, if program unblocks a signal (or returns from sigsuspend)2127// it's better to deliver the signal straight away.2128TSAN_INTERCEPTOR(int, sigsuspend, const __sanitizer_sigset_t *mask) {2129 SCOPED_TSAN_INTERCEPTOR(sigsuspend, mask);2130 return REAL(sigsuspend)(mask);2131}2132 2133TSAN_INTERCEPTOR(int, sigblock, int mask) {2134 SCOPED_TSAN_INTERCEPTOR(sigblock, mask);2135 return REAL(sigblock)(mask);2136}2137 2138TSAN_INTERCEPTOR(int, sigsetmask, int mask) {2139 SCOPED_TSAN_INTERCEPTOR(sigsetmask, mask);2140 return REAL(sigsetmask)(mask);2141}2142 2143TSAN_INTERCEPTOR(int, pthread_sigmask, int how, const __sanitizer_sigset_t *set,2144 __sanitizer_sigset_t *oldset) {2145 SCOPED_TSAN_INTERCEPTOR(pthread_sigmask, how, set, oldset);2146 return REAL(pthread_sigmask)(how, set, oldset);2147}2148 2149namespace __tsan {2150 2151static void ReportErrnoSpoiling(ThreadState *thr, uptr pc, int sig) {2152 VarSizeStackTrace stack;2153 // StackTrace::GetNestInstructionPc(pc) is used because return address is2154 // expected, OutputReport() will undo this.2155 ObtainCurrentStack(thr, StackTrace::GetNextInstructionPc(pc), &stack);2156 // Use alloca, because malloc during signal handling deadlocks2157 ScopedReport *rep = (ScopedReport *)__builtin_alloca(sizeof(ScopedReport));2158 bool suppressed;2159 // Take a new scope as Apple platforms require the below locks released2160 // before symbolizing in order to avoid a deadlock2161 {2162 ThreadRegistryLock l(&ctx->thread_registry);2163 new (rep) ScopedReport(ReportTypeErrnoInSignal);2164 rep->SetSigNum(sig);2165 suppressed = IsFiredSuppression(ctx, ReportTypeErrnoInSignal, stack);2166 if (!suppressed)2167 rep->AddStack(stack, true);2168#if SANITIZER_APPLE2169 } // Close this scope to release the locks before writing report2170#endif2171 if (!suppressed)2172 OutputReport(thr, *rep);2173 2174 // Need to manually destroy this because we used placement new to allocate2175 rep->~ScopedReport();2176#if !SANITIZER_APPLE2177 }2178#endif2179}2180 2181static void CallUserSignalHandler(ThreadState *thr, bool sync, bool acquire,2182 int sig, __sanitizer_siginfo *info,2183 void *uctx) {2184 CHECK(thr->slot);2185 __sanitizer_sigaction *sigactions = interceptor_ctx()->sigactions;2186 if (acquire)2187 Acquire(thr, 0, (uptr)&sigactions[sig]);2188 // Signals are generally asynchronous, so if we receive a signals when2189 // ignores are enabled we should disable ignores. This is critical for sync2190 // and interceptors, because otherwise we can miss synchronization and report2191 // false races.2192 int ignore_reads_and_writes = thr->ignore_reads_and_writes;2193 int ignore_interceptors = thr->ignore_interceptors;2194 int ignore_sync = thr->ignore_sync;2195 // For symbolizer we only process SIGSEGVs synchronously2196 // (bug in symbolizer or in tsan). But we want to reset2197 // in_symbolizer to fail gracefully. Symbolizer and user code2198 // use different memory allocators, so if we don't reset2199 // in_symbolizer we can get memory allocated with one being2200 // feed with another, which can cause more crashes.2201 int in_symbolizer = thr->in_symbolizer;2202 if (!ctx->after_multithreaded_fork) {2203 thr->ignore_reads_and_writes = 0;2204 thr->fast_state.ClearIgnoreBit();2205 thr->ignore_interceptors = 0;2206 thr->ignore_sync = 0;2207 thr->in_symbolizer = 0;2208 }2209 // Ensure that the handler does not spoil errno.2210 const int saved_errno = errno;2211 errno = 99;2212 // This code races with sigaction. Be careful to not read sa_sigaction twice.2213 // Also need to remember pc for reporting before the call,2214 // because the handler can reset it.2215 volatile uptr pc = (sigactions[sig].sa_flags & SA_SIGINFO)2216 ? (uptr)sigactions[sig].sigaction2217 : (uptr)sigactions[sig].handler;2218 if (pc != sig_dfl && pc != sig_ign) {2219 // The callback can be either sa_handler or sa_sigaction.2220 // They have different signatures, but we assume that passing2221 // additional arguments to sa_handler works and is harmless.2222 ((__sanitizer_sigactionhandler_ptr)pc)(sig, info, uctx);2223 }2224 if (!ctx->after_multithreaded_fork) {2225 thr->ignore_reads_and_writes = ignore_reads_and_writes;2226 if (ignore_reads_and_writes)2227 thr->fast_state.SetIgnoreBit();2228 thr->ignore_interceptors = ignore_interceptors;2229 thr->ignore_sync = ignore_sync;2230 thr->in_symbolizer = in_symbolizer;2231 }2232 // We do not detect errno spoiling for SIGTERM,2233 // because some SIGTERM handlers do spoil errno but reraise SIGTERM,2234 // tsan reports false positive in such case.2235 // It's difficult to properly detect this situation (reraise),2236 // because in async signal processing case (when handler is called directly2237 // from rtl_generic_sighandler) we have not yet received the reraised2238 // signal; and it looks too fragile to intercept all ways to reraise a signal.2239 if (ShouldReport(thr, ReportTypeErrnoInSignal) && !sync && sig != SIGTERM &&2240 errno != 99)2241 ReportErrnoSpoiling(thr, pc, sig);2242 errno = saved_errno;2243}2244 2245void ProcessPendingSignalsImpl(ThreadState *thr) {2246 atomic_store(&thr->pending_signals, 0, memory_order_relaxed);2247 ThreadSignalContext *sctx = SigCtx(thr);2248 if (sctx == 0)2249 return;2250 atomic_fetch_add(&thr->in_signal_handler, 1, memory_order_relaxed);2251 internal_sigfillset(&sctx->emptyset);2252 __sanitizer_sigset_t *oldset = sctx->oldset.PushBack();2253 int res = REAL(pthread_sigmask)(SIG_SETMASK, &sctx->emptyset, oldset);2254 CHECK_EQ(res, 0);2255 for (int sig = 0; sig < kSigCount; sig++) {2256 SignalDesc *signal = &sctx->pending_signals[sig];2257 if (signal->armed) {2258 signal->armed = false;2259 CallUserSignalHandler(thr, false, true, sig, &signal->siginfo,2260 &signal->ctx);2261 }2262 }2263 res = REAL(pthread_sigmask)(SIG_SETMASK, oldset, 0);2264 CHECK_EQ(res, 0);2265 sctx->oldset.PopBack();2266 atomic_fetch_add(&thr->in_signal_handler, -1, memory_order_relaxed);2267}2268 2269} // namespace __tsan2270 2271static bool is_sync_signal(ThreadSignalContext *sctx, int sig,2272 __sanitizer_siginfo *info) {2273 // If we are sending signal to ourselves, we must process it now.2274 if (sctx && sig == sctx->int_signal_send)2275 return true;2276#if SANITIZER_HAS_SIGINFO2277 // POSIX timers can be configured to send any kind of signal; however, it2278 // doesn't make any sense to consider a timer signal as synchronous!2279 if (info->si_code == SI_TIMER)2280 return false;2281#endif2282 return sig == SIGSEGV || sig == SIGBUS || sig == SIGILL || sig == SIGTRAP ||2283 sig == SIGABRT || sig == SIGFPE || sig == SIGPIPE || sig == SIGSYS;2284}2285 2286void sighandler(int sig, __sanitizer_siginfo *info, void *ctx) {2287 ThreadState *thr = cur_thread_init();2288 ThreadSignalContext *sctx = SigCtx(thr);2289 if (sig < 0 || sig >= kSigCount) {2290 VPrintf(1, "ThreadSanitizer: ignoring signal %d\n", sig);2291 return;2292 }2293 // Don't mess with synchronous signals.2294 const bool sync = is_sync_signal(sctx, sig, info);2295 if (sync ||2296 // If we are in blocking function, we can safely process it now2297 // (but check if we are in a recursive interceptor,2298 // i.e. pthread_join()->munmap()).2299 atomic_load(&thr->in_blocking_func, memory_order_relaxed)) {2300 atomic_fetch_add(&thr->in_signal_handler, 1, memory_order_relaxed);2301 if (atomic_load(&thr->in_blocking_func, memory_order_relaxed)) {2302 atomic_store(&thr->in_blocking_func, 0, memory_order_relaxed);2303 CallUserSignalHandler(thr, sync, true, sig, info, ctx);2304 atomic_store(&thr->in_blocking_func, 1, memory_order_relaxed);2305 } else {2306 // Be very conservative with when we do acquire in this case.2307 // It's unsafe to do acquire in async handlers, because ThreadState2308 // can be in inconsistent state.2309 // SIGSYS looks relatively safe -- it's synchronous and can actually2310 // need some global state.2311 bool acq = (sig == SIGSYS);2312 CallUserSignalHandler(thr, sync, acq, sig, info, ctx);2313 }2314 atomic_fetch_add(&thr->in_signal_handler, -1, memory_order_relaxed);2315 return;2316 }2317 2318 if (sctx == 0)2319 return;2320 SignalDesc *signal = &sctx->pending_signals[sig];2321 if (signal->armed == false) {2322 signal->armed = true;2323 internal_memcpy(&signal->siginfo, info, sizeof(*info));2324 internal_memcpy(&signal->ctx, ctx, sizeof(signal->ctx));2325 atomic_store(&thr->pending_signals, 1, memory_order_relaxed);2326 }2327}2328 2329TSAN_INTERCEPTOR(int, raise, int sig) {2330 SCOPED_TSAN_INTERCEPTOR(raise, sig);2331 ThreadSignalContext *sctx = SigCtx(thr);2332 CHECK_NE(sctx, 0);2333 int prev = sctx->int_signal_send;2334 sctx->int_signal_send = sig;2335 int res = REAL(raise)(sig);2336 CHECK_EQ(sctx->int_signal_send, sig);2337 sctx->int_signal_send = prev;2338 return res;2339}2340 2341TSAN_INTERCEPTOR(int, kill, int pid, int sig) {2342 SCOPED_TSAN_INTERCEPTOR(kill, pid, sig);2343 ThreadSignalContext *sctx = SigCtx(thr);2344 CHECK_NE(sctx, 0);2345 int prev = sctx->int_signal_send;2346 if (pid == (int)internal_getpid()) {2347 sctx->int_signal_send = sig;2348 }2349 int res = REAL(kill)(pid, sig);2350 if (pid == (int)internal_getpid()) {2351 CHECK_EQ(sctx->int_signal_send, sig);2352 sctx->int_signal_send = prev;2353 }2354 return res;2355}2356 2357TSAN_INTERCEPTOR(int, pthread_kill, void *tid, int sig) {2358 SCOPED_TSAN_INTERCEPTOR(pthread_kill, tid, sig);2359 ThreadSignalContext *sctx = SigCtx(thr);2360 CHECK_NE(sctx, 0);2361 int prev = sctx->int_signal_send;2362 bool self = pthread_equal(tid, pthread_self());2363 if (self)2364 sctx->int_signal_send = sig;2365 int res = REAL(pthread_kill)(tid, sig);2366 if (self) {2367 CHECK_EQ(sctx->int_signal_send, sig);2368 sctx->int_signal_send = prev;2369 }2370 return res;2371}2372 2373TSAN_INTERCEPTOR(int, gettimeofday, void *tv, void *tz) {2374 SCOPED_TSAN_INTERCEPTOR(gettimeofday, tv, tz);2375 // It's intercepted merely to process pending signals.2376 return REAL(gettimeofday)(tv, tz);2377}2378 2379TSAN_INTERCEPTOR(int, getaddrinfo, void *node, void *service,2380 void *hints, void *rv) {2381 SCOPED_TSAN_INTERCEPTOR(getaddrinfo, node, service, hints, rv);2382 // We miss atomic synchronization in getaddrinfo,2383 // and can report false race between malloc and free2384 // inside of getaddrinfo. So ignore memory accesses.2385 ThreadIgnoreBegin(thr, pc);2386 int res = REAL(getaddrinfo)(node, service, hints, rv);2387 ThreadIgnoreEnd(thr);2388 return res;2389}2390 2391TSAN_INTERCEPTOR(int, fork, int fake) {2392 if (in_symbolizer())2393 return REAL(fork)(fake);2394 SCOPED_INTERCEPTOR_RAW(fork, fake);2395 return REAL(fork)(fake);2396}2397 2398void atfork_prepare() {2399 if (in_symbolizer())2400 return;2401 ThreadState *thr = cur_thread();2402 const uptr pc = StackTrace::GetCurrentPc();2403 ForkBefore(thr, pc);2404}2405 2406void atfork_parent() {2407 if (in_symbolizer())2408 return;2409 ThreadState *thr = cur_thread();2410 const uptr pc = StackTrace::GetCurrentPc();2411 ForkParentAfter(thr, pc);2412}2413 2414void atfork_child() {2415 if (in_symbolizer())2416 return;2417 ThreadState *thr = cur_thread();2418 const uptr pc = StackTrace::GetCurrentPc();2419 ForkChildAfter(thr, pc, true);2420 FdOnFork(thr, pc);2421}2422 2423#if !SANITIZER_IOS2424TSAN_INTERCEPTOR(int, vfork, int fake) {2425 // Some programs (e.g. openjdk) call close for all file descriptors2426 // in the child process. Under tsan it leads to false positives, because2427 // address space is shared, so the parent process also thinks that2428 // the descriptors are closed (while they are actually not).2429 // This leads to false positives due to missed synchronization.2430 // Strictly saying this is undefined behavior, because vfork child is not2431 // allowed to call any functions other than exec/exit. But this is what2432 // openjdk does, so we want to handle it.2433 // We could disable interceptors in the child process. But it's not possible2434 // to simply intercept and wrap vfork, because vfork child is not allowed2435 // to return from the function that calls vfork, and that's exactly what2436 // we would do. So this would require some assembly trickery as well.2437 // Instead we simply turn vfork into fork.2438 return WRAP(fork)(fake);2439}2440#endif2441 2442#if SANITIZER_LINUX && !SANITIZER_ANDROID2443// Bionic's pthread_create internally calls clone. When the CLONE_THREAD flag is2444// set, clone does not create a new process but a new thread. This is a2445// workaround for Android. Disabling the interception of clone solves the2446// problem in most scenarios.2447TSAN_INTERCEPTOR(int, clone, int (*fn)(void *), void *stack, int flags,2448 void *arg, int *parent_tid, void *tls, pid_t *child_tid) {2449 SCOPED_INTERCEPTOR_RAW(clone, fn, stack, flags, arg, parent_tid, tls,2450 child_tid);2451 struct Arg {2452 int (*fn)(void *);2453 void *arg;2454 };2455 auto wrapper = +[](void *p) -> int {2456 auto *thr = cur_thread();2457 uptr pc = GET_CURRENT_PC();2458 // Start the background thread for fork, but not for clone.2459 // For fork we did this always and it's known to work (or user code has2460 // adopted). But if we do this for the new clone interceptor some code2461 // (sandbox2) fails. So model we used to do for years and don't start the2462 // background thread after clone.2463 ForkChildAfter(thr, pc, false);2464 FdOnFork(thr, pc);2465 auto *arg = static_cast<Arg *>(p);2466 return arg->fn(arg->arg);2467 };2468 ForkBefore(thr, pc);2469 Arg arg_wrapper = {fn, arg};2470 int pid = REAL(clone)(wrapper, stack, flags, &arg_wrapper, parent_tid, tls,2471 child_tid);2472 ForkParentAfter(thr, pc);2473 return pid;2474}2475#endif2476 2477#if !SANITIZER_APPLE && !SANITIZER_ANDROID2478typedef int (*dl_iterate_phdr_cb_t)(__sanitizer_dl_phdr_info *info, SIZE_T size,2479 void *data);2480struct dl_iterate_phdr_data {2481 ThreadState *thr;2482 uptr pc;2483 dl_iterate_phdr_cb_t cb;2484 void *data;2485};2486 2487static bool IsAppNotRodata(uptr addr) {2488 return IsAppMem(addr) && *MemToShadow(addr) != Shadow::kRodata;2489}2490 2491static int dl_iterate_phdr_cb(__sanitizer_dl_phdr_info *info, SIZE_T size,2492 void *data) {2493 dl_iterate_phdr_data *cbdata = (dl_iterate_phdr_data *)data;2494 // dlopen/dlclose allocate/free dynamic-linker-internal memory, which is later2495 // accessible in dl_iterate_phdr callback. But we don't see synchronization2496 // inside of dynamic linker, so we "unpoison" it here in order to not2497 // produce false reports. Ignoring malloc/free in dlopen/dlclose is not enough2498 // because some libc functions call __libc_dlopen.2499 if (info && IsAppNotRodata((uptr)info->dlpi_name))2500 MemoryResetRange(cbdata->thr, cbdata->pc, (uptr)info->dlpi_name,2501 internal_strlen(info->dlpi_name));2502 int res = cbdata->cb(info, size, cbdata->data);2503 // Perform the check one more time in case info->dlpi_name was overwritten2504 // by user callback.2505 if (info && IsAppNotRodata((uptr)info->dlpi_name))2506 MemoryResetRange(cbdata->thr, cbdata->pc, (uptr)info->dlpi_name,2507 internal_strlen(info->dlpi_name));2508 return res;2509}2510 2511TSAN_INTERCEPTOR(int, dl_iterate_phdr, dl_iterate_phdr_cb_t cb, void *data) {2512 SCOPED_TSAN_INTERCEPTOR(dl_iterate_phdr, cb, data);2513 dl_iterate_phdr_data cbdata;2514 cbdata.thr = thr;2515 cbdata.pc = pc;2516 cbdata.cb = cb;2517 cbdata.data = data;2518 int res = REAL(dl_iterate_phdr)(dl_iterate_phdr_cb, &cbdata);2519 return res;2520}2521#endif2522 2523static int OnExit(ThreadState *thr) {2524 int status = Finalize(thr);2525 FlushStreams();2526 return status;2527}2528 2529#if !SANITIZER_APPLE2530static void HandleRecvmsg(ThreadState *thr, uptr pc,2531 __sanitizer_msghdr *msg) {2532 int fds[64];2533 int cnt = ExtractRecvmsgFDs(msg, fds, ARRAY_SIZE(fds));2534 for (int i = 0; i < cnt; i++)2535 FdEventCreate(thr, pc, fds[i]);2536}2537#endif2538 2539#include "sanitizer_common/sanitizer_platform_interceptors.h"2540// Causes interceptor recursion (getaddrinfo() and fopen())2541#undef SANITIZER_INTERCEPT_GETADDRINFO2542// We define our own.2543#if SANITIZER_INTERCEPT_TLS_GET_ADDR2544#define NEED_TLS_GET_ADDR2545#endif2546#undef SANITIZER_INTERCEPT_TLS_GET_ADDR2547#define SANITIZER_INTERCEPT_TLS_GET_OFFSET 12548#undef SANITIZER_INTERCEPT_PTHREAD_SIGMASK2549 2550#define COMMON_INTERCEPT_FUNCTION_VER(name, ver) \2551 INTERCEPT_FUNCTION_VER(name, ver)2552#define COMMON_INTERCEPT_FUNCTION_VER_UNVERSIONED_FALLBACK(name, ver) \2553 (INTERCEPT_FUNCTION_VER(name, ver) || INTERCEPT_FUNCTION(name))2554 2555#define COMMON_INTERCEPTOR_ENTER_NOIGNORE(ctx, func, ...) \2556 SCOPED_INTERCEPTOR_RAW(func, __VA_ARGS__); \2557 TsanInterceptorContext _ctx = {thr, pc}; \2558 ctx = (void *)&_ctx; \2559 (void)ctx;2560 2561#define COMMON_INTERCEPTOR_FILE_OPEN(ctx, file, path) \2562 if (path) \2563 Acquire(thr, pc, File2addr(path)); \2564 if (file) { \2565 int fd = fileno_unlocked(file); \2566 if (fd >= 0) FdFileCreate(thr, pc, fd); \2567 }2568 2569#define COMMON_INTERCEPTOR_FILE_CLOSE(ctx, file) \2570 if (file) { \2571 int fd = fileno_unlocked(file); \2572 FdClose(thr, pc, fd); \2573 }2574 2575#define COMMON_INTERCEPTOR_DLOPEN(filename, flag) \2576 ({ \2577 CheckNoDeepBind(filename, flag); \2578 ThreadIgnoreBegin(thr, 0); \2579 void *res = REAL(dlopen)(filename, flag); \2580 ThreadIgnoreEnd(thr); \2581 res; \2582 })2583 2584// Ignore interceptors in OnLibraryLoaded()/Unloaded(). These hooks use code2585// (ListOfModules::init, MemoryMappingLayout::DumpListOfModules) that make2586// intercepted calls, which can cause deadlockes with ReportRace() which also2587// uses this code.2588#define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, handle) \2589 ({ \2590 ScopedIgnoreInterceptors ignore_interceptors; \2591 libignore()->OnLibraryLoaded(filename); \2592 })2593 2594#define COMMON_INTERCEPTOR_LIBRARY_UNLOADED() \2595 ({ \2596 ScopedIgnoreInterceptors ignore_interceptors; \2597 libignore()->OnLibraryUnloaded(); \2598 })2599 2600#define COMMON_INTERCEPTOR_ACQUIRE(ctx, u) \2601 Acquire(((TsanInterceptorContext *) ctx)->thr, pc, u)2602 2603#define COMMON_INTERCEPTOR_RELEASE(ctx, u) \2604 Release(((TsanInterceptorContext *) ctx)->thr, pc, u)2605 2606#define COMMON_INTERCEPTOR_DIR_ACQUIRE(ctx, path) \2607 Acquire(((TsanInterceptorContext *) ctx)->thr, pc, Dir2addr(path))2608 2609#define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \2610 FdAcquire(((TsanInterceptorContext *) ctx)->thr, pc, fd)2611 2612#define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \2613 FdRelease(((TsanInterceptorContext *) ctx)->thr, pc, fd)2614 2615#define COMMON_INTERCEPTOR_FD_ACCESS(ctx, fd) \2616 FdAccess(((TsanInterceptorContext *) ctx)->thr, pc, fd)2617 2618#define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd) \2619 FdSocketAccept(((TsanInterceptorContext *) ctx)->thr, pc, fd, newfd)2620 2621#define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) \2622 ThreadSetName(((TsanInterceptorContext *) ctx)->thr, name)2623 2624#define COMMON_INTERCEPTOR_SET_PTHREAD_NAME(ctx, thread, name) \2625 if (pthread_equal(pthread_self(), reinterpret_cast<void *>(thread))) \2626 COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name); \2627 else \2628 __tsan::ctx->thread_registry.SetThreadNameByUserId(thread, name)2629 2630#define COMMON_INTERCEPTOR_BLOCK_REAL(name) BLOCK_REAL(name)2631 2632#define COMMON_INTERCEPTOR_ON_EXIT(ctx) \2633 OnExit(((TsanInterceptorContext *) ctx)->thr)2634 2635#define COMMON_INTERCEPTOR_MMAP_IMPL(ctx, mmap, addr, sz, prot, flags, fd, \2636 off) \2637 do { \2638 return mmap_interceptor(thr, pc, REAL(mmap), addr, sz, prot, flags, fd, \2639 off); \2640 } while (false)2641 2642#define COMMON_INTERCEPTOR_MUNMAP_IMPL(ctx, addr, sz) \2643 do { \2644 return munmap_interceptor(thr, pc, REAL(munmap), addr, sz); \2645 } while (false)2646 2647#if !SANITIZER_APPLE2648#define COMMON_INTERCEPTOR_HANDLE_RECVMSG(ctx, msg) \2649 HandleRecvmsg(((TsanInterceptorContext *)ctx)->thr, \2650 ((TsanInterceptorContext *)ctx)->pc, msg)2651#endif2652 2653#define COMMON_INTERCEPTOR_GET_TLS_RANGE(begin, end) \2654 if (TsanThread *t = GetCurrentThread()) { \2655 *begin = t->tls_begin(); \2656 *end = t->tls_end(); \2657 } else { \2658 *begin = *end = 0; \2659 }2660 2661#define COMMON_INTERCEPTOR_USER_CALLBACK_START() \2662 SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_START()2663 2664#define COMMON_INTERCEPTOR_USER_CALLBACK_END() \2665 SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_END()2666 2667#include "sanitizer_common/sanitizer_common_interceptors.inc"2668 2669static int sigaction_impl(int sig, const __sanitizer_sigaction *act,2670 __sanitizer_sigaction *old);2671static __sanitizer_sighandler_ptr signal_impl(int sig,2672 __sanitizer_sighandler_ptr h);2673 2674#define SIGNAL_INTERCEPTOR_SIGACTION_IMPL(signo, act, oldact) \2675 { return sigaction_impl(signo, act, oldact); }2676 2677#define SIGNAL_INTERCEPTOR_SIGNAL_IMPL(func, signo, handler) \2678 { return (uptr)signal_impl(signo, (__sanitizer_sighandler_ptr)handler); }2679 2680#define SIGNAL_INTERCEPTOR_ENTER() LazyInitialize(cur_thread_init())2681 2682#include "sanitizer_common/sanitizer_signal_interceptors.inc"2683 2684int sigaction_impl(int sig, const __sanitizer_sigaction *act,2685 __sanitizer_sigaction *old) {2686 // Note: if we call REAL(sigaction) directly for any reason without proxying2687 // the signal handler through sighandler, very bad things will happen.2688 // The handler will run synchronously and corrupt tsan per-thread state.2689 SCOPED_INTERCEPTOR_RAW(sigaction, sig, act, old);2690 if (sig <= 0 || sig >= kSigCount) {2691 errno = errno_EINVAL;2692 return -1;2693 }2694 __sanitizer_sigaction *sigactions = interceptor_ctx()->sigactions;2695 __sanitizer_sigaction old_stored;2696 if (old) internal_memcpy(&old_stored, &sigactions[sig], sizeof(old_stored));2697 __sanitizer_sigaction newact;2698 if (act) {2699 // Copy act into sigactions[sig].2700 // Can't use struct copy, because compiler can emit call to memcpy.2701 // Can't use internal_memcpy, because it copies byte-by-byte,2702 // and signal handler reads the handler concurrently. It can read2703 // some bytes from old value and some bytes from new value.2704 // Use volatile to prevent insertion of memcpy.2705 sigactions[sig].handler =2706 *(volatile __sanitizer_sighandler_ptr const *)&act->handler;2707 sigactions[sig].sa_flags = *(volatile int const *)&act->sa_flags;2708 internal_memcpy(&sigactions[sig].sa_mask, &act->sa_mask,2709 sizeof(sigactions[sig].sa_mask));2710#if !SANITIZER_FREEBSD && !SANITIZER_APPLE && !SANITIZER_NETBSD2711 sigactions[sig].sa_restorer = act->sa_restorer;2712#endif2713 internal_memcpy(&newact, act, sizeof(newact));2714 internal_sigfillset(&newact.sa_mask);2715 if ((act->sa_flags & SA_SIGINFO) ||2716 ((uptr)act->handler != sig_ign && (uptr)act->handler != sig_dfl)) {2717 newact.sa_flags |= SA_SIGINFO;2718 newact.sigaction = sighandler;2719 }2720 ReleaseStore(thr, pc, (uptr)&sigactions[sig]);2721 act = &newact;2722 }2723 int res = REAL(sigaction)(sig, act, old);2724 if (res == 0 && old && old->sigaction == sighandler)2725 internal_memcpy(old, &old_stored, sizeof(*old));2726 return res;2727}2728 2729static __sanitizer_sighandler_ptr signal_impl(int sig,2730 __sanitizer_sighandler_ptr h) {2731 __sanitizer_sigaction act;2732 act.handler = h;2733 internal_memset(&act.sa_mask, -1, sizeof(act.sa_mask));2734 act.sa_flags = 0;2735 __sanitizer_sigaction old;2736 int res = sigaction_symname(sig, &act, &old);2737 if (res) return (__sanitizer_sighandler_ptr)sig_err;2738 return old.handler;2739}2740 2741#define TSAN_SYSCALL() \2742 ThreadState *thr = cur_thread(); \2743 if (thr->ignore_interceptors) \2744 return; \2745 ScopedSyscall scoped_syscall(thr)2746 2747struct ScopedSyscall {2748 ThreadState *thr;2749 2750 explicit ScopedSyscall(ThreadState *thr) : thr(thr) { LazyInitialize(thr); }2751 2752 ~ScopedSyscall() {2753 ProcessPendingSignals(thr);2754 }2755};2756 2757#if !SANITIZER_FREEBSD && !SANITIZER_APPLE2758static void syscall_access_range(uptr pc, uptr p, uptr s, bool write) {2759 TSAN_SYSCALL();2760 MemoryAccessRange(thr, pc, p, s, write);2761}2762 2763static USED void syscall_acquire(uptr pc, uptr addr) {2764 TSAN_SYSCALL();2765 Acquire(thr, pc, addr);2766 DPrintf("syscall_acquire(0x%zx))\n", addr);2767}2768 2769static USED void syscall_release(uptr pc, uptr addr) {2770 TSAN_SYSCALL();2771 DPrintf("syscall_release(0x%zx)\n", addr);2772 Release(thr, pc, addr);2773}2774 2775static void syscall_fd_close(uptr pc, int fd) {2776 auto *thr = cur_thread();2777 FdClose(thr, pc, fd);2778}2779 2780static USED void syscall_fd_acquire(uptr pc, int fd) {2781 TSAN_SYSCALL();2782 FdAcquire(thr, pc, fd);2783 DPrintf("syscall_fd_acquire(%d)\n", fd);2784}2785 2786static USED void syscall_fd_release(uptr pc, int fd) {2787 TSAN_SYSCALL();2788 DPrintf("syscall_fd_release(%d)\n", fd);2789 FdRelease(thr, pc, fd);2790}2791 2792static USED void sycall_blocking_start() {2793 DPrintf("sycall_blocking_start()\n");2794 ThreadState *thr = cur_thread();2795 EnterBlockingFunc(thr);2796 // When we are in a "blocking call", we process signals asynchronously2797 // (right when they arrive). In this context we do not expect to be2798 // executing any user/runtime code. The known interceptor sequence when2799 // this is not true is: pthread_join -> munmap(stack). It's fine2800 // to ignore munmap in this case -- we handle stack shadow separately.2801 thr->ignore_interceptors++;2802}2803 2804static USED void sycall_blocking_end() {2805 DPrintf("sycall_blocking_end()\n");2806 ThreadState *thr = cur_thread();2807 thr->ignore_interceptors--;2808 atomic_store(&thr->in_blocking_func, 0, memory_order_relaxed);2809}2810 2811static void syscall_pre_fork(uptr pc) { ForkBefore(cur_thread(), pc); }2812 2813static void syscall_post_fork(uptr pc, int pid) {2814 ThreadState *thr = cur_thread();2815 if (pid == 0) {2816 // child2817 ForkChildAfter(thr, pc, true);2818 FdOnFork(thr, pc);2819 } else if (pid > 0) {2820 // parent2821 ForkParentAfter(thr, pc);2822 } else {2823 // error2824 ForkParentAfter(thr, pc);2825 }2826}2827#endif2828 2829#define COMMON_SYSCALL_PRE_READ_RANGE(p, s) \2830 syscall_access_range(GET_CALLER_PC(), (uptr)(p), (uptr)(s), false)2831 2832#define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) \2833 syscall_access_range(GET_CALLER_PC(), (uptr)(p), (uptr)(s), true)2834 2835#define COMMON_SYSCALL_POST_READ_RANGE(p, s) \2836 do { \2837 (void)(p); \2838 (void)(s); \2839 } while (false)2840 2841#define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) \2842 do { \2843 (void)(p); \2844 (void)(s); \2845 } while (false)2846 2847#define COMMON_SYSCALL_ACQUIRE(addr) \2848 syscall_acquire(GET_CALLER_PC(), (uptr)(addr))2849 2850#define COMMON_SYSCALL_RELEASE(addr) \2851 syscall_release(GET_CALLER_PC(), (uptr)(addr))2852 2853#define COMMON_SYSCALL_FD_CLOSE(fd) syscall_fd_close(GET_CALLER_PC(), fd)2854 2855#define COMMON_SYSCALL_FD_ACQUIRE(fd) syscall_fd_acquire(GET_CALLER_PC(), fd)2856 2857#define COMMON_SYSCALL_FD_RELEASE(fd) syscall_fd_release(GET_CALLER_PC(), fd)2858 2859#define COMMON_SYSCALL_PRE_FORK() \2860 syscall_pre_fork(GET_CALLER_PC())2861 2862#define COMMON_SYSCALL_POST_FORK(res) \2863 syscall_post_fork(GET_CALLER_PC(), res)2864 2865#define COMMON_SYSCALL_BLOCKING_START() sycall_blocking_start()2866#define COMMON_SYSCALL_BLOCKING_END() sycall_blocking_end()2867 2868#include "sanitizer_common/sanitizer_common_syscalls.inc"2869#include "sanitizer_common/sanitizer_syscalls_netbsd.inc"2870 2871#ifdef NEED_TLS_GET_ADDR2872 2873static void handle_tls_addr(void *arg, void *res) {2874 ThreadState *thr = cur_thread();2875 if (!thr)2876 return;2877 DTLS::DTV *dtv = DTLS_on_tls_get_addr(arg, res, thr->tls_addr,2878 thr->tls_addr + thr->tls_size);2879 if (!dtv)2880 return;2881 // New DTLS block has been allocated.2882 MemoryResetRange(thr, 0, dtv->beg, dtv->size);2883}2884 2885#if !SANITIZER_S3902886// Define own interceptor instead of sanitizer_common's for three reasons:2887// 1. It must not process pending signals.2888// Signal handlers may contain MOVDQA instruction (see below).2889// 2. It must be as simple as possible to not contain MOVDQA.2890// 3. Sanitizer_common version uses COMMON_INTERCEPTOR_INITIALIZE_RANGE which2891// is empty for tsan (meant only for msan).2892// Note: __tls_get_addr can be called with mis-aligned stack due to:2893// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=580662894// So the interceptor must work with mis-aligned stack, in particular, does not2895// execute MOVDQA with stack addresses.2896TSAN_INTERCEPTOR(void *, __tls_get_addr, void *arg) {2897 void *res = REAL(__tls_get_addr)(arg);2898 handle_tls_addr(arg, res);2899 return res;2900}2901#else // SANITIZER_S3902902TSAN_INTERCEPTOR(uptr, __tls_get_addr_internal, void *arg) {2903 uptr res = __tls_get_offset_wrapper(arg, REAL(__tls_get_offset));2904 char *tp = static_cast<char *>(__builtin_thread_pointer());2905 handle_tls_addr(arg, res + tp);2906 return res;2907}2908#endif2909#endif2910 2911#if SANITIZER_NETBSD2912TSAN_INTERCEPTOR(void, _lwp_exit) {2913 SCOPED_TSAN_INTERCEPTOR(_lwp_exit);2914 DestroyThreadState();2915 REAL(_lwp_exit)();2916}2917#define TSAN_MAYBE_INTERCEPT__LWP_EXIT TSAN_INTERCEPT(_lwp_exit)2918#else2919#define TSAN_MAYBE_INTERCEPT__LWP_EXIT2920#endif2921 2922#if SANITIZER_FREEBSD2923TSAN_INTERCEPTOR(void, thr_exit, ThreadID *state) {2924 SCOPED_TSAN_INTERCEPTOR(thr_exit, state);2925 DestroyThreadState();2926 REAL(thr_exit(state));2927}2928# define TSAN_MAYBE_INTERCEPT_THR_EXIT TSAN_INTERCEPT(thr_exit)2929#else2930#define TSAN_MAYBE_INTERCEPT_THR_EXIT2931#endif2932 2933TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, cond_init, void *c, void *a)2934TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, cond_destroy, void *c)2935TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, cond_signal, void *c)2936TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, cond_broadcast, void *c)2937TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, cond_wait, void *c, void *m)2938TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, mutex_init, void *m, void *a)2939TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, mutex_destroy, void *m)2940TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, mutex_lock, void *m)2941TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, mutex_trylock, void *m)2942TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, mutex_unlock, void *m)2943TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, rwlock_init, void *l, void *a)2944TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, rwlock_destroy, void *l)2945TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, rwlock_rdlock, void *l)2946TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, rwlock_tryrdlock, void *l)2947TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, rwlock_wrlock, void *l)2948TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, rwlock_trywrlock, void *l)2949TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, rwlock_unlock, void *l)2950TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, once, void *o, void (*i)())2951TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, sigmask, int f, void *n, void *o)2952 2953TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_init, void *c, void *a)2954TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_signal, void *c)2955TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_broadcast, void *c)2956TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_wait, void *c, void *m)2957TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_destroy, void *c)2958TSAN_INTERCEPTOR_NETBSD_ALIAS(int, mutex_init, void *m, void *a)2959TSAN_INTERCEPTOR_NETBSD_ALIAS(int, mutex_destroy, void *m)2960TSAN_INTERCEPTOR_NETBSD_ALIAS(int, mutex_lock, void *m)2961TSAN_INTERCEPTOR_NETBSD_ALIAS(int, mutex_trylock, void *m)2962TSAN_INTERCEPTOR_NETBSD_ALIAS(int, mutex_unlock, void *m)2963TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_init, void *m, void *a)2964TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_destroy, void *m)2965TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_rdlock, void *m)2966TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_tryrdlock, void *m)2967TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_wrlock, void *m)2968TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_trywrlock, void *m)2969TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_unlock, void *m)2970TSAN_INTERCEPTOR_NETBSD_ALIAS_THR(int, once, void *o, void (*f)())2971TSAN_INTERCEPTOR_NETBSD_ALIAS_THR2(int, sigsetmask, sigmask, int a, void *b,2972 void *c)2973 2974namespace __tsan {2975 2976static void finalize(void *arg) {2977 ThreadState *thr = cur_thread();2978 int status = Finalize(thr);2979 // Make sure the output is not lost.2980 FlushStreams();2981 if (status)2982 Die();2983}2984 2985#if !SANITIZER_APPLE && !SANITIZER_ANDROID2986static void unreachable() {2987 Report("FATAL: ThreadSanitizer: unreachable called\n");2988 Die();2989}2990#endif2991 2992// Define default implementation since interception of libdispatch is optional.2993SANITIZER_WEAK_ATTRIBUTE void InitializeLibdispatchInterceptors() {}2994 2995void InitializeInterceptors() {2996#if !SANITIZER_APPLE2997 // We need to setup it early, because functions like dlsym() can call it.2998 REAL(memset) = internal_memset;2999 REAL(memcpy) = internal_memcpy;3000#endif3001 3002 __interception::DoesNotSupportStaticLinking();3003 3004 new(interceptor_ctx()) InterceptorContext();3005 3006 // Interpose __tls_get_addr before the common interposers. This is needed3007 // because dlsym() may call malloc on failure which could result in other3008 // interposed functions being called that could eventually make use of TLS.3009#ifdef NEED_TLS_GET_ADDR3010# if !SANITIZER_S3903011 TSAN_INTERCEPT(__tls_get_addr);3012# else3013 TSAN_INTERCEPT(__tls_get_addr_internal);3014 TSAN_INTERCEPT(__tls_get_offset);3015# endif3016#endif3017 InitializeCommonInterceptors();3018 InitializeSignalInterceptors();3019 InitializeLibdispatchInterceptors();3020 3021#if !SANITIZER_APPLE3022 InitializeSetjmpInterceptors();3023#endif3024 3025 TSAN_INTERCEPT(longjmp_symname);3026 TSAN_INTERCEPT(siglongjmp_symname);3027#if SANITIZER_NETBSD3028 TSAN_INTERCEPT(_longjmp);3029#endif3030 3031 TSAN_INTERCEPT(malloc);3032 TSAN_INTERCEPT(__libc_memalign);3033 TSAN_INTERCEPT(calloc);3034 TSAN_INTERCEPT(realloc);3035 TSAN_INTERCEPT(reallocarray);3036 TSAN_INTERCEPT(free);3037 TSAN_MAYBE_INTERCEPT_FREE_SIZED;3038 TSAN_MAYBE_INTERCEPT_FREE_ALIGNED_SIZED;3039 TSAN_INTERCEPT(cfree);3040 TSAN_INTERCEPT(munmap);3041 TSAN_MAYBE_INTERCEPT_MEMALIGN;3042 TSAN_INTERCEPT(valloc);3043 TSAN_MAYBE_INTERCEPT_PVALLOC;3044 TSAN_INTERCEPT(posix_memalign);3045 3046 TSAN_INTERCEPT(strcpy);3047 TSAN_INTERCEPT(strncpy);3048 TSAN_INTERCEPT(strdup);3049 3050 TSAN_INTERCEPT(pthread_create);3051 TSAN_INTERCEPT(pthread_join);3052 TSAN_INTERCEPT(pthread_detach);3053 TSAN_INTERCEPT(pthread_exit);3054 #if SANITIZER_LINUX3055 TSAN_INTERCEPT(pthread_tryjoin_np);3056 TSAN_INTERCEPT(pthread_timedjoin_np);3057 #endif3058 3059 // In glibc versions older than 2.36, dlsym(RTLD_NEXT, "pthread_cond_init")3060 // may return an outdated symbol (max(2.2,base_version)) if the port was3061 // introduced before 2.3.2 (when the new pthread_cond_t was introduced).3062#if SANITIZER_GLIBC && !__GLIBC_PREREQ(2, 36) && \3063 (defined(__x86_64__) || defined(__mips__) || SANITIZER_PPC64V1 || \3064 defined(__s390x__))3065 INTERCEPT_FUNCTION_VER(pthread_cond_init, "GLIBC_2.3.2");3066 INTERCEPT_FUNCTION_VER(pthread_cond_signal, "GLIBC_2.3.2");3067 INTERCEPT_FUNCTION_VER(pthread_cond_broadcast, "GLIBC_2.3.2");3068 INTERCEPT_FUNCTION_VER(pthread_cond_wait, "GLIBC_2.3.2");3069 INTERCEPT_FUNCTION_VER(pthread_cond_timedwait, "GLIBC_2.3.2");3070 INTERCEPT_FUNCTION_VER(pthread_cond_destroy, "GLIBC_2.3.2");3071#else3072 INTERCEPT_FUNCTION(pthread_cond_init);3073 INTERCEPT_FUNCTION(pthread_cond_signal);3074 INTERCEPT_FUNCTION(pthread_cond_broadcast);3075 INTERCEPT_FUNCTION(pthread_cond_wait);3076 INTERCEPT_FUNCTION(pthread_cond_timedwait);3077 INTERCEPT_FUNCTION(pthread_cond_destroy);3078#endif3079 3080 TSAN_MAYBE_PTHREAD_COND_CLOCKWAIT;3081 3082 TSAN_INTERCEPT(pthread_mutex_init);3083 TSAN_INTERCEPT(pthread_mutex_destroy);3084 TSAN_INTERCEPT(pthread_mutex_lock);3085 TSAN_INTERCEPT(pthread_mutex_trylock);3086 TSAN_INTERCEPT(pthread_mutex_timedlock);3087 TSAN_INTERCEPT(pthread_mutex_unlock);3088#if SANITIZER_LINUX3089 TSAN_INTERCEPT(pthread_mutex_clocklock);3090#endif3091#if SANITIZER_GLIBC3092# if !__GLIBC_PREREQ(2, 34)3093 TSAN_INTERCEPT(__pthread_mutex_lock);3094 TSAN_INTERCEPT(__pthread_mutex_unlock);3095# endif3096#endif3097 3098 TSAN_INTERCEPT(pthread_spin_init);3099 TSAN_INTERCEPT(pthread_spin_destroy);3100 TSAN_INTERCEPT(pthread_spin_lock);3101 TSAN_INTERCEPT(pthread_spin_trylock);3102 TSAN_INTERCEPT(pthread_spin_unlock);3103 3104 TSAN_INTERCEPT(pthread_rwlock_init);3105 TSAN_INTERCEPT(pthread_rwlock_destroy);3106 TSAN_INTERCEPT(pthread_rwlock_rdlock);3107 TSAN_INTERCEPT(pthread_rwlock_tryrdlock);3108 TSAN_INTERCEPT(pthread_rwlock_timedrdlock);3109 TSAN_INTERCEPT(pthread_rwlock_wrlock);3110 TSAN_INTERCEPT(pthread_rwlock_trywrlock);3111 TSAN_INTERCEPT(pthread_rwlock_timedwrlock);3112 TSAN_INTERCEPT(pthread_rwlock_unlock);3113 3114 TSAN_INTERCEPT(pthread_barrier_init);3115 TSAN_INTERCEPT(pthread_barrier_destroy);3116 TSAN_INTERCEPT(pthread_barrier_wait);3117 3118 TSAN_INTERCEPT(pthread_once);3119 3120 TSAN_MAYBE_INTERCEPT___FXSTAT;3121 TSAN_MAYBE_INTERCEPT_FSTAT;3122 TSAN_MAYBE_INTERCEPT_FSTAT64;3123 TSAN_INTERCEPT(open);3124 TSAN_MAYBE_INTERCEPT_OPEN64;3125 TSAN_INTERCEPT(creat);3126 TSAN_MAYBE_INTERCEPT_CREAT64;3127 TSAN_INTERCEPT(dup);3128 TSAN_INTERCEPT(dup2);3129 TSAN_INTERCEPT(dup3);3130 TSAN_MAYBE_INTERCEPT_EVENTFD;3131 TSAN_MAYBE_INTERCEPT_SIGNALFD;3132 TSAN_MAYBE_INTERCEPT_INOTIFY_INIT;3133 TSAN_MAYBE_INTERCEPT_INOTIFY_INIT1;3134 TSAN_INTERCEPT(socket);3135 TSAN_INTERCEPT(socketpair);3136 TSAN_INTERCEPT(connect);3137 TSAN_INTERCEPT(bind);3138 TSAN_INTERCEPT(listen);3139 TSAN_MAYBE_INTERCEPT_EPOLL;3140 TSAN_INTERCEPT(close);3141 TSAN_MAYBE_INTERCEPT___CLOSE;3142 TSAN_MAYBE_INTERCEPT___RES_ICLOSE;3143 TSAN_INTERCEPT(pipe);3144 TSAN_INTERCEPT(pipe2);3145 3146 TSAN_INTERCEPT(unlink);3147 TSAN_INTERCEPT(tmpfile);3148 TSAN_MAYBE_INTERCEPT_TMPFILE64;3149 TSAN_INTERCEPT(abort);3150 TSAN_INTERCEPT(rmdir);3151 TSAN_INTERCEPT(closedir);3152 3153 TSAN_INTERCEPT(sigsuspend);3154 TSAN_INTERCEPT(sigblock);3155 TSAN_INTERCEPT(sigsetmask);3156 TSAN_INTERCEPT(pthread_sigmask);3157 TSAN_INTERCEPT(raise);3158 TSAN_INTERCEPT(kill);3159 TSAN_INTERCEPT(pthread_kill);3160 TSAN_INTERCEPT(sleep);3161 TSAN_INTERCEPT(usleep);3162 TSAN_INTERCEPT(nanosleep);3163 TSAN_INTERCEPT(pause);3164 TSAN_INTERCEPT(gettimeofday);3165 TSAN_INTERCEPT(getaddrinfo);3166 3167 TSAN_INTERCEPT(fork);3168 TSAN_INTERCEPT(vfork);3169#if SANITIZER_LINUX && !SANITIZER_ANDROID3170 TSAN_INTERCEPT(clone);3171#endif3172#if !SANITIZER_ANDROID3173 TSAN_INTERCEPT(dl_iterate_phdr);3174#endif3175 3176 // Symbolization indirectly calls dl_iterate_phdr3177 ready_to_symbolize = true;3178 3179 TSAN_MAYBE_INTERCEPT_ON_EXIT;3180 TSAN_INTERCEPT(__cxa_atexit);3181 TSAN_INTERCEPT(_exit);3182 3183 TSAN_MAYBE_INTERCEPT__LWP_EXIT;3184 TSAN_MAYBE_INTERCEPT_THR_EXIT;3185 3186#if !SANITIZER_APPLE && !SANITIZER_ANDROID3187 // Need to setup it, because interceptors check that the function is resolved.3188 // But atexit is emitted directly into the module, so can't be resolved.3189 REAL(atexit) = (int(*)(void(*)()))unreachable;3190#endif3191 3192 if (REAL(__cxa_atexit)(&finalize, 0, 0)) {3193 Printf("ThreadSanitizer: failed to setup atexit callback\n");3194 Die();3195 }3196 if (pthread_atfork(atfork_prepare, atfork_parent, atfork_child)) {3197 Printf("ThreadSanitizer: failed to setup atfork callbacks\n");3198 Die();3199 }3200 3201#if !SANITIZER_APPLE && !SANITIZER_NETBSD && !SANITIZER_FREEBSD3202 if (pthread_key_create(&interceptor_ctx()->finalize_key, &thread_finalize)) {3203 Printf("ThreadSanitizer: failed to create thread key\n");3204 Die();3205 }3206#endif3207 3208 TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(cond_init);3209 TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(cond_destroy);3210 TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(cond_signal);3211 TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(cond_broadcast);3212 TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(cond_wait);3213 TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(mutex_init);3214 TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(mutex_destroy);3215 TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(mutex_lock);3216 TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(mutex_trylock);3217 TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(mutex_unlock);3218 TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(rwlock_init);3219 TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(rwlock_destroy);3220 TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(rwlock_rdlock);3221 TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(rwlock_tryrdlock);3222 TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(rwlock_wrlock);3223 TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(rwlock_trywrlock);3224 TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(rwlock_unlock);3225 TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(once);3226 TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(sigmask);3227 3228 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(cond_init);3229 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(cond_signal);3230 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(cond_broadcast);3231 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(cond_wait);3232 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(cond_destroy);3233 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(mutex_init);3234 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(mutex_destroy);3235 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(mutex_lock);3236 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(mutex_trylock);3237 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(mutex_unlock);3238 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_init);3239 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_destroy);3240 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_rdlock);3241 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_tryrdlock);3242 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_wrlock);3243 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_trywrlock);3244 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_unlock);3245 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS_THR(once);3246 TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS_THR(sigsetmask);3247 3248 FdInit();3249}3250 3251} // namespace __tsan3252 3253// Invisible barrier for tests.3254// There were several unsuccessful iterations for this functionality:3255// 1. Initially it was implemented in user code using3256// REAL(pthread_barrier_wait). But pthread_barrier_wait is not supported on3257// MacOS. Futexes are linux-specific for this matter.3258// 2. Then we switched to atomics+usleep(10). But usleep produced parasitic3259// "as-if synchronized via sleep" messages in reports which failed some3260// output tests.3261// 3. Then we switched to atomics+sched_yield. But this produced tons of tsan-3262// visible events, which lead to "failed to restore stack trace" failures.3263// Note that no_sanitize_thread attribute does not turn off atomic interception3264// so attaching it to the function defined in user code does not help.3265// That's why we now have what we have.3266constexpr u32 kBarrierThreadBits = 10;3267constexpr u32 kBarrierThreads = 1 << kBarrierThreadBits;3268 3269extern "C" {3270 3271SANITIZER_INTERFACE_ATTRIBUTE void __tsan_testonly_barrier_init(3272 atomic_uint32_t *barrier, u32 num_threads) {3273 if (num_threads >= kBarrierThreads) {3274 Printf("barrier_init: count is too large (%d)\n", num_threads);3275 Die();3276 }3277 // kBarrierThreadBits lsb is thread count,3278 // the remaining are count of entered threads.3279 atomic_store(barrier, num_threads, memory_order_relaxed);3280}3281 3282static u32 barrier_epoch(u32 value) {3283 return (value >> kBarrierThreadBits) / (value & (kBarrierThreads - 1));3284}3285 3286SANITIZER_INTERFACE_ATTRIBUTE void __tsan_testonly_barrier_wait(3287 atomic_uint32_t *barrier) {3288 u32 old = atomic_fetch_add(barrier, kBarrierThreads, memory_order_relaxed);3289 u32 old_epoch = barrier_epoch(old);3290 if (barrier_epoch(old + kBarrierThreads) != old_epoch) {3291 FutexWake(barrier, (1 << 30));3292 return;3293 }3294 for (;;) {3295 u32 cur = atomic_load(barrier, memory_order_relaxed);3296 if (barrier_epoch(cur) != old_epoch)3297 return;3298 FutexWait(barrier, cur);3299 }3300}3301 3302} // extern "C"3303