1	//===-- tsan_interceptors_posix.cpp ---------------------------------------===//
2	//
3	// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4	// See https://llvm.org/LICENSE.txt for license information.
5	// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6	//
7	//===----------------------------------------------------------------------===//
8	//
9	// This file is a part of ThreadSanitizer (TSan), a race detector.
10	//
11	// FIXME: move as many interceptors as possible into
12	// sanitizer_common/sanitizer_common_interceptors.inc
13	//===----------------------------------------------------------------------===//
14
15	#include <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_platform_limits_netbsd.h"
26	#include "sanitizer_common/sanitizer_platform_limits_posix.h"
27	#include "sanitizer_common/sanitizer_posix.h"
28	#include "sanitizer_common/sanitizer_stacktrace.h"
29	#include "sanitizer_common/sanitizer_tls_get_addr.h"
30	#include "sanitizer_common/sanitizer_vector.h"
31	#include "tsan_fd.h"
32	#include "tsan_interceptors.h"
33	#include "tsan_interface.h"
34	#include "tsan_mman.h"
35	#include "tsan_platform.h"
36	#include "tsan_rtl.h"
37	#include "tsan_suppressions.h"
38
39	using namespace __tsan;
40
41	DECLARE_REAL(void *, memcpy, void *to, const void *from, SIZE_T size)
42	DECLARE_REAL(void *, memset, void *block, int c, SIZE_T size)
43
44	#if SANITIZER_FREEBSD || SANITIZER_APPLE
45	#define stdout __stdoutp
46	#define stderr __stderrp
47	#endif
48
49	#if SANITIZER_NETBSD
50	#define dirfd(dirp) (*(int *)(dirp))
51	#define fileno_unlocked(fp) \
52	(((__sanitizer_FILE *)fp)->_file == -1 \
53	? -1 \
54	: (int)(unsigned short)(((__sanitizer_FILE *)fp)->_file))
55
56	#define stdout ((__sanitizer_FILE*)&__sF[1])
57	#define stderr ((__sanitizer_FILE*)&__sF[2])
58
59	#define nanosleep __nanosleep50
60	#define vfork __vfork14
61	#endif
62
63	#ifdef __mips__
64	const int kSigCount = 129;
65	#else
66	const int kSigCount = 65;
67	#endif
68
69	#ifdef __mips__
70	struct ucontext_t {
71	u64 opaque[768 / sizeof(u64) + 1];
72	};
73	#else
74	struct ucontext_t {
75	// The size is determined by looking at sizeof of real ucontext_t on linux.
76	u64 opaque[936 / sizeof(u64) + 1];
77	};
78	#endif
79
80	#if defined(__x86_64__) || defined(__mips__) || SANITIZER_PPC64V1 || \
81	defined(__s390x__)
82	#define PTHREAD_ABI_BASE "GLIBC_2.3.2"
83	#elif defined(__aarch64__) || SANITIZER_PPC64V2
84	#define PTHREAD_ABI_BASE "GLIBC_2.17"
85	#elif SANITIZER_LOONGARCH64
86	#define PTHREAD_ABI_BASE "GLIBC_2.36"
87	#elif SANITIZER_RISCV64
88	# define PTHREAD_ABI_BASE "GLIBC_2.27"
89	#endif
90
91	extern "C" int pthread_attr_init(void *attr);
92	extern "C" int pthread_attr_destroy(void *attr);
93	DECLARE_REAL(int, pthread_attr_getdetachstate, void *, void *)
94	extern "C" int pthread_attr_setstacksize(void *attr, uptr stacksize);
95	extern "C" int pthread_atfork(void (*prepare)(void), void (*parent)(void),
96	void (*child)(void));
97	extern "C" int pthread_key_create(unsigned *key, void (*destructor)(void* v));
98	extern "C" int pthread_setspecific(unsigned key, const void *v);
99	DECLARE_REAL(int, pthread_mutexattr_gettype, void *, void *)
100	DECLARE_REAL(int, fflush, __sanitizer_FILE *fp)
101	DECLARE_REAL_AND_INTERCEPTOR(void *, malloc, usize size)
102	DECLARE_REAL_AND_INTERCEPTOR(void, free, void *ptr)
103	extern "C" int pthread_equal(void *t1, void *t2);
104	extern "C" void *pthread_self();
105	extern "C" void _exit(int status);
106	#if !SANITIZER_NETBSD
107	extern "C" int fileno_unlocked(void *stream);
108	extern "C" int dirfd(void *dirp);
109	#endif
110	#if SANITIZER_NETBSD
111	extern __sanitizer_FILE __sF[];
112	#else
113	extern __sanitizer_FILE *stdout, *stderr;
114	#endif
115	#if !SANITIZER_FREEBSD && !SANITIZER_APPLE && !SANITIZER_NETBSD
116	const int PTHREAD_MUTEX_RECURSIVE = 1;
117	const int PTHREAD_MUTEX_RECURSIVE_NP = 1;
118	#else
119	const int PTHREAD_MUTEX_RECURSIVE = 2;
120	const int PTHREAD_MUTEX_RECURSIVE_NP = 2;
121	#endif
122	#if !SANITIZER_FREEBSD && !SANITIZER_APPLE && !SANITIZER_NETBSD
123	const int EPOLL_CTL_ADD = 1;
124	#endif
125	const int SIGILL = 4;
126	const int SIGTRAP = 5;
127	const int SIGABRT = 6;
128	const int SIGFPE = 8;
129	const int SIGSEGV = 11;
130	const int SIGPIPE = 13;
131	const int SIGTERM = 15;
132	#if defined(__mips__) || SANITIZER_FREEBSD || SANITIZER_APPLE || SANITIZER_NETBSD
133	const int SIGBUS = 10;
134	const int SIGSYS = 12;
135	#else
136	const int SIGBUS = 7;
137	const int SIGSYS = 31;
138	#endif
139	#if SANITIZER_HAS_SIGINFO
140	const int SI_TIMER = -2;
141	#endif
142	void *const MAP_FAILED = (void*)-1;
143	#if SANITIZER_NETBSD
144	const int PTHREAD_BARRIER_SERIAL_THREAD = 1234567;
145	#elif !SANITIZER_APPLE
146	const int PTHREAD_BARRIER_SERIAL_THREAD = -1;
147	#endif
148	const int MAP_FIXED = 0x10;
149	typedef long long_t;
150	typedef __sanitizer::u16 mode_t;
151
152	// From /usr/include/unistd.h
153	# define F_ULOCK 0 /* Unlock a previously locked region. */
154	# define F_LOCK 1 /* Lock a region for exclusive use. */
155	# define F_TLOCK 2 /* Test and lock a region for exclusive use. */
156	# define F_TEST 3 /* Test a region for other processes locks. */
157
158	#if SANITIZER_FREEBSD || SANITIZER_APPLE || SANITIZER_NETBSD
159	const int SA_SIGINFO = 0x40;
160	const int SIG_SETMASK = 3;
161	#elif defined(__mips__)
162	const int SA_SIGINFO = 8;
163	const int SIG_SETMASK = 3;
164	#else
165	const int SA_SIGINFO = 4;
166	const int SIG_SETMASK = 2;
167	#endif
168
169	namespace __tsan {
170	struct SignalDesc {
171	bool armed;
172	__sanitizer_siginfo siginfo;
173	ucontext_t ctx;
174	};
175
176	struct ThreadSignalContext {
177	int int_signal_send;
178	SignalDesc pending_signals[kSigCount];
179	// emptyset and oldset are too big for stack.
180	__sanitizer_sigset_t emptyset;
181	__sanitizer::Vector<__sanitizer_sigset_t> oldset;
182	};
183
184	void EnterBlockingFunc(ThreadState *thr) {
185	for (;;) {
186	// The order is important to not delay a signal infinitely if it's
187	// delivered right before we set in_blocking_func. Note: we can't call
188	// ProcessPendingSignals when in_blocking_func is set, or we can handle
189	// a signal synchronously when we are already handling a signal.
190	atomic_store(a: &thr->in_blocking_func, v: 1, mo: memory_order_relaxed);
191	if (atomic_load(a: &thr->pending_signals, mo: memory_order_relaxed) == 0)
192	break;
193	atomic_store(a: &thr->in_blocking_func, v: 0, mo: memory_order_relaxed);
194	ProcessPendingSignals(thr);
195	}
196	}
197
198	// The sole reason tsan wraps atexit callbacks is to establish synchronization
199	// between callback setup and callback execution.
200	struct AtExitCtx {
201	void (*f)();
202	void *arg;
203	uptr pc;
204	};
205
206	// InterceptorContext holds all global data required for interceptors.
207	// It's explicitly constructed in InitializeInterceptors with placement new
208	// and is never destroyed. This allows usage of members with non-trivial
209	// constructors and destructors.
210	struct InterceptorContext {
211	// The object is 64-byte aligned, because we want hot data to be located
212	// in a single cache line if possible (it's accessed in every interceptor).
213	alignas(64) LibIgnore libignore;
214	__sanitizer_sigaction sigactions[kSigCount];
215	#if !SANITIZER_APPLE && !SANITIZER_NETBSD
216	unsigned finalize_key;
217	#endif
218
219	Mutex atexit_mu;
220	Vector<struct AtExitCtx *> AtExitStack;
221
222	InterceptorContext() : libignore(LINKER_INITIALIZED), atexit_mu(MutexTypeAtExit), AtExitStack() {}
223	};
224
225	alignas(64) static char interceptor_placeholder[sizeof(InterceptorContext)];
226	InterceptorContext *interceptor_ctx() {
227	return reinterpret_cast<InterceptorContext*>(&interceptor_placeholder[0]);
228	}
229
230	LibIgnore *libignore() {
231	return &interceptor_ctx()->libignore;
232	}
233
234	void InitializeLibIgnore() {
235	const SuppressionContext &supp = *Suppressions();
236	const uptr n = supp.SuppressionCount();
237	for (uptr i = 0; i < n; i++) {
238	const Suppression *s = supp.SuppressionAt(i);
239	if (0 == internal_strcmp(s1: s->type, s2: kSuppressionLib))
240	libignore()->AddIgnoredLibrary(name_templ: s->templ);
241	}
242	if (flags()->ignore_noninstrumented_modules)
243	libignore()->IgnoreNoninstrumentedModules(enable: true);
244	libignore()->OnLibraryLoaded(name: 0);
245	}
246
247	// The following two hooks can be used by for cooperative scheduling when
248	// locking.
249	#ifdef TSAN_EXTERNAL_HOOKS
250	void OnPotentiallyBlockingRegionBegin();
251	void OnPotentiallyBlockingRegionEnd();
252	#else
253	SANITIZER_WEAK_CXX_DEFAULT_IMPL void OnPotentiallyBlockingRegionBegin() {}
254	SANITIZER_WEAK_CXX_DEFAULT_IMPL void OnPotentiallyBlockingRegionEnd() {}
255	#endif
256
257	// FIXME: Use for `in_symbolizer()` as well. As-is we can't use
258	// `DlSymAllocator`, because it uses the primary allocator only. Symbolizer
259	// requires support of the secondary allocator for larger blocks.
260	struct DlsymAlloc : public DlSymAllocator<DlsymAlloc> {
261	static bool UseImpl() { return (ctx && !ctx->initialized); }
262	};
263
264	} // namespace __tsan
265
266	static ThreadSignalContext *SigCtx(ThreadState *thr) {
267	// This function may be called reentrantly if it is interrupted by a signal
268	// handler. Use CAS to handle the race.
269	uptr ctx = atomic_load(a: &thr->signal_ctx, mo: memory_order_relaxed);
270	if (ctx == 0 && !thr->is_dead) {
271	uptr pctx =
272	(uptr)MmapOrDie(size: sizeof(ThreadSignalContext), mem_type: "ThreadSignalContext");
273	MemoryResetRange(thr, pc: (uptr)&SigCtx, addr: pctx, size: sizeof(ThreadSignalContext));
274	if (atomic_compare_exchange_strong(a: &thr->signal_ctx, cmp: &ctx, xchg: pctx,
275	mo: memory_order_relaxed)) {
276	ctx = pctx;
277	} else {
278	UnmapOrDie(addr: (ThreadSignalContext *)pctx, size: sizeof(ThreadSignalContext));
279	}
280	}
281	return (ThreadSignalContext *)ctx;
282	}
283
284	ScopedInterceptor::ScopedInterceptor(ThreadState *thr, const char *fname,
285	uptr pc)
286	: thr_(thr) {
287	LazyInitialize(thr);
288	if (UNLIKELY(atomic_load(&thr->in_blocking_func, memory_order_relaxed))) {
289	// pthread_join is marked as blocking, but it's also known to call other
290	// intercepted functions (mmap, free). If we don't reset in_blocking_func
291	// we can get deadlocks and memory corruptions if we deliver a synchronous
292	// signal inside of an mmap/free interceptor.
293	// So reset it and restore it back in the destructor.
294	// See https://github.com/google/sanitizers/issues/1540
295	atomic_store(a: &thr->in_blocking_func, v: 0, mo: memory_order_relaxed);
296	in_blocking_func_ = true;
297	}
298	if (!thr_->is_inited) return;
299	if (!thr_->ignore_interceptors) FuncEntry(thr, pc);
300	DPrintf("#%d: intercept %s()\n", thr_->tid, fname);
301	ignoring_ =
302	!thr_->in_ignored_lib && (flags()->ignore_interceptors_accesses ||
303	libignore()->IsIgnored(pc, pc_in_ignored_lib: &in_ignored_lib_));
304	EnableIgnores();
305	}
306
307	ScopedInterceptor::~ScopedInterceptor() {
308	if (!thr_->is_inited) return;
309	DisableIgnores();
310	if (UNLIKELY(in_blocking_func_))
311	EnterBlockingFunc(thr: thr_);
312	if (!thr_->ignore_interceptors) {
313	ProcessPendingSignals(thr: thr_);
314	FuncExit(thr: thr_);
315	CheckedMutex::CheckNoLocks();
316	}
317	}
318
319	NOINLINE
320	void ScopedInterceptor::EnableIgnoresImpl() {
321	ThreadIgnoreBegin(thr: thr_, pc: 0);
322	if (flags()->ignore_noninstrumented_modules)
323	thr_->suppress_reports++;
324	if (in_ignored_lib_) {
325	DCHECK(!thr_->in_ignored_lib);
326	thr_->in_ignored_lib = true;
327	}
328	}
329
330	NOINLINE
331	void ScopedInterceptor::DisableIgnoresImpl() {
332	ThreadIgnoreEnd(thr: thr_);
333	if (flags()->ignore_noninstrumented_modules)
334	thr_->suppress_reports--;
335	if (in_ignored_lib_) {
336	DCHECK(thr_->in_ignored_lib);
337	thr_->in_ignored_lib = false;
338	}
339	}
340
341	#define TSAN_INTERCEPT(func) INTERCEPT_FUNCTION(func)
342	#if SANITIZER_FREEBSD || SANITIZER_NETBSD
343	# define TSAN_INTERCEPT_VER(func, ver) INTERCEPT_FUNCTION(func)
344	#else
345	# define TSAN_INTERCEPT_VER(func, ver) INTERCEPT_FUNCTION_VER(func, ver)
346	#endif
347	#if SANITIZER_FREEBSD
348	# define TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(func) \
349	INTERCEPT_FUNCTION(_pthread_##func)
350	#else
351	# define TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(func)
352	#endif
353	#if SANITIZER_NETBSD
354	# define TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(func) \
355	INTERCEPT_FUNCTION(__libc_##func)
356	# define TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS_THR(func) \
357	INTERCEPT_FUNCTION(__libc_thr_##func)
358	#else
359	# define TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(func)
360	# define TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS_THR(func)
361	#endif
362
363	#define READ_STRING_OF_LEN(thr, pc, s, len, n) \
364	MemoryAccessRange((thr), (pc), (uptr)(s), \
365	common_flags()->strict_string_checks ? (len) + 1 : (n), false)
366
367	#define READ_STRING(thr, pc, s, n) \
368	READ_STRING_OF_LEN((thr), (pc), (s), internal_strlen(s), (n))
369
370	#define BLOCK_REAL(name) (BlockingCall(thr), REAL(name))
371
372	struct BlockingCall {
373	explicit BlockingCall(ThreadState *thr)
374	: thr(thr) {
375	EnterBlockingFunc(thr);
376	// When we are in a "blocking call", we process signals asynchronously
377	// (right when they arrive). In this context we do not expect to be
378	// executing any user/runtime code. The known interceptor sequence when
379	// this is not true is: pthread_join -> munmap(stack). It's fine
380	// to ignore munmap in this case -- we handle stack shadow separately.
381	thr->ignore_interceptors++;
382	}
383
384	~BlockingCall() {
385	thr->ignore_interceptors--;
386	atomic_store(a: &thr->in_blocking_func, v: 0, mo: memory_order_relaxed);
387	}
388
389	ThreadState *thr;
390	};
391
392	TSAN_INTERCEPTOR(unsigned, sleep, unsigned sec) {
393	SCOPED_TSAN_INTERCEPTOR(sleep, sec);
394	unsigned res = BLOCK_REAL(sleep)(sec);
395	AfterSleep(thr, pc);
396	return res;
397	}
398
399	TSAN_INTERCEPTOR(int, usleep, long_t usec) {
400	SCOPED_TSAN_INTERCEPTOR(usleep, usec);
401	int res = BLOCK_REAL(usleep)(usec);
402	AfterSleep(thr, pc);
403	return res;
404	}
405
406	TSAN_INTERCEPTOR(int, nanosleep, void *req, void *rem) {
407	SCOPED_TSAN_INTERCEPTOR(nanosleep, req, rem);
408	int res = BLOCK_REAL(nanosleep)(req, rem);
409	AfterSleep(thr, pc);
410	return res;
411	}
412
413	TSAN_INTERCEPTOR(int, pause, int fake) {
414	SCOPED_TSAN_INTERCEPTOR(pause, fake);
415	return BLOCK_REAL(pause)(fake);
416	}
417
418	// Note: we specifically call the function in such strange way
419	// with "installed_at" because in reports it will appear between
420	// callback frames and the frame that installed the callback.
421	static void at_exit_callback_installed_at() {
422	AtExitCtx *ctx;
423	{
424	// Ensure thread-safety.
425	Lock l(&interceptor_ctx()->atexit_mu);
426
427	// Pop AtExitCtx from the top of the stack of callback functions
428	uptr element = interceptor_ctx()->AtExitStack.Size() - 1;
429	ctx = interceptor_ctx()->AtExitStack[element];
430	interceptor_ctx()->AtExitStack.PopBack();
431	}
432
433	ThreadState *thr = cur_thread();
434	Acquire(thr, pc: ctx->pc, addr: (uptr)ctx);
435	FuncEntry(thr, pc: ctx->pc);
436	((void(*)())ctx->f)();
437	FuncExit(thr);
438	Free(p&: ctx);
439	}
440
441	static void cxa_at_exit_callback_installed_at(void *arg) {
442	ThreadState *thr = cur_thread();
443	AtExitCtx *ctx = (AtExitCtx*)arg;
444	Acquire(thr, pc: ctx->pc, addr: (uptr)arg);
445	FuncEntry(thr, pc: ctx->pc);
446	((void(*)(void *arg))ctx->f)(ctx->arg);
447	FuncExit(thr);
448	Free(p&: ctx);
449	}
450
451	static int setup_at_exit_wrapper(ThreadState *thr, uptr pc, void(*f)(),
452	void *arg, void *dso);
453
454	#if !SANITIZER_ANDROID
455	TSAN_INTERCEPTOR(int, atexit, void (*f)()) {
456	if (in_symbolizer())
457	return 0;
458	// We want to setup the atexit callback even if we are in ignored lib
459	// or after fork.
460	SCOPED_INTERCEPTOR_RAW(atexit, f);
461	return setup_at_exit_wrapper(thr, GET_CALLER_PC(), f: (void (*)())f, arg: 0, dso: 0);
462	}
463	#endif
464
465	TSAN_INTERCEPTOR(int, __cxa_atexit, void (*f)(void *a), void *arg, void *dso) {
466	if (in_symbolizer())
467	return 0;
468	SCOPED_TSAN_INTERCEPTOR(__cxa_atexit, f, arg, dso);
469	return setup_at_exit_wrapper(thr, GET_CALLER_PC(), f: (void (*)())f, arg, dso);
470	}
471
472	static int setup_at_exit_wrapper(ThreadState *thr, uptr pc, void(*f)(),
473	void *arg, void *dso) {
474	auto *ctx = New<AtExitCtx>();
475	ctx->f = f;
476	ctx->arg = arg;
477	ctx->pc = pc;
478	Release(thr, pc, addr: (uptr)ctx);
479	// Memory allocation in __cxa_atexit will race with free during exit,
480	// because we do not see synchronization around atexit callback list.
481	ThreadIgnoreBegin(thr, pc);
482	int res;
483	if (!dso) {
484	// NetBSD does not preserve the 2nd argument if dso is equal to 0
485	// Store ctx in a local stack-like structure
486
487	// Ensure thread-safety.
488	Lock l(&interceptor_ctx()->atexit_mu);
489	// __cxa_atexit calls calloc. If we don't ignore interceptors, we will fail
490	// due to atexit_mu held on exit from the calloc interceptor.
491	ScopedIgnoreInterceptors ignore;
492
493	res = REAL(__cxa_atexit)((void (*)(void *a))at_exit_callback_installed_at,
494	0, 0);
495	// Push AtExitCtx on the top of the stack of callback functions
496	if (!res) {
497	interceptor_ctx()->AtExitStack.PushBack(v: ctx);
498	}
499	} else {
500	res = REAL(__cxa_atexit)(cxa_at_exit_callback_installed_at, ctx, dso);
501	}
502	ThreadIgnoreEnd(thr);
503	return res;
504	}
505
506	#if !SANITIZER_APPLE && !SANITIZER_NETBSD
507	static void on_exit_callback_installed_at(int status, void *arg) {
508	ThreadState *thr = cur_thread();
509	AtExitCtx *ctx = (AtExitCtx*)arg;
510	Acquire(thr, pc: ctx->pc, addr: (uptr)arg);
511	FuncEntry(thr, pc: ctx->pc);
512	((void(*)(int status, void *arg))ctx->f)(status, ctx->arg);
513	FuncExit(thr);
514	Free(p&: ctx);
515	}
516
517	TSAN_INTERCEPTOR(int, on_exit, void(*f)(int, void*), void *arg) {
518	if (in_symbolizer())
519	return 0;
520	SCOPED_TSAN_INTERCEPTOR(on_exit, f, arg);
521	auto *ctx = New<AtExitCtx>();
522	ctx->f = (void(*)())f;
523	ctx->arg = arg;
524	ctx->pc = GET_CALLER_PC();
525	Release(thr, pc, addr: (uptr)ctx);
526	// Memory allocation in __cxa_atexit will race with free during exit,
527	// because we do not see synchronization around atexit callback list.
528	ThreadIgnoreBegin(thr, pc);
529	int res = REAL(on_exit)(on_exit_callback_installed_at, ctx);
530	ThreadIgnoreEnd(thr);
531	return res;
532	}
533	#define TSAN_MAYBE_INTERCEPT_ON_EXIT TSAN_INTERCEPT(on_exit)
534	#else
535	#define TSAN_MAYBE_INTERCEPT_ON_EXIT
536	#endif
537
538	// Cleanup old bufs.
539	static void JmpBufGarbageCollect(ThreadState *thr, uptr sp) {
540	for (uptr i = 0; i < thr->jmp_bufs.Size(); i++) {
541	JmpBuf *buf = &thr->jmp_bufs[i];
542	if (buf->sp <= sp) {
543	uptr sz = thr->jmp_bufs.Size();
544	internal_memcpy(dest: buf, src: &thr->jmp_bufs[sz - 1], n: sizeof(*buf));
545	thr->jmp_bufs.PopBack();
546	i--;
547	}
548	}
549	}
550
551	static void SetJmp(ThreadState *thr, uptr sp) {
552	if (!thr->is_inited) // called from libc guts during bootstrap
553	return;
554	// Cleanup old bufs.
555	JmpBufGarbageCollect(thr, sp);
556	// Remember the buf.
557	JmpBuf *buf = thr->jmp_bufs.PushBack();
558	buf->sp = sp;
559	buf->shadow_stack_pos = thr->shadow_stack_pos;
560	ThreadSignalContext *sctx = SigCtx(thr);
561	buf->int_signal_send = sctx ? sctx->int_signal_send : 0;
562	buf->oldset_stack_size = sctx ? sctx->oldset.Size() : 0;
563	buf->in_blocking_func = atomic_load(a: &thr->in_blocking_func, mo: memory_order_relaxed);
564	buf->in_signal_handler = atomic_load(a: &thr->in_signal_handler,
565	mo: memory_order_relaxed);
566	}
567
568	static void LongJmp(ThreadState *thr, uptr *env) {
569	uptr sp = ExtractLongJmpSp(env);
570	// Find the saved buf with matching sp.
571	for (uptr i = 0; i < thr->jmp_bufs.Size(); i++) {
572	JmpBuf *buf = &thr->jmp_bufs[i];
573	if (buf->sp == sp) {
574	CHECK_GE(thr->shadow_stack_pos, buf->shadow_stack_pos);
575	// Unwind the stack.
576	while (thr->shadow_stack_pos > buf->shadow_stack_pos)
577	FuncExit(thr);
578	ThreadSignalContext *sctx = SigCtx(thr);
579	if (sctx) {
580	sctx->int_signal_send = buf->int_signal_send;
581	while (sctx->oldset.Size() > buf->oldset_stack_size)
582	sctx->oldset.PopBack();
583	}
584	atomic_store(a: &thr->in_blocking_func, v: buf->in_blocking_func,
585	mo: memory_order_relaxed);
586	atomic_store(a: &thr->in_signal_handler, v: buf->in_signal_handler,
587	mo: memory_order_relaxed);
588	JmpBufGarbageCollect(thr, sp: buf->sp - 1); // do not collect buf->sp
589	return;
590	}
591	}
592	Printf(format: "ThreadSanitizer: can't find longjmp buf\n");
593	CHECK(0);
594	}
595
596	// FIXME: put everything below into a common extern "C" block?
597	extern "C" void __tsan_setjmp(uptr sp) { SetJmp(thr: cur_thread_init(), sp); }
598
599	#if SANITIZER_APPLE
600	TSAN_INTERCEPTOR(int, setjmp, void *env);
601	TSAN_INTERCEPTOR(int, _setjmp, void *env);
602	TSAN_INTERCEPTOR(int, sigsetjmp, void *env);
603	#else // SANITIZER_APPLE
604
605	#if SANITIZER_NETBSD
606	#define setjmp_symname __setjmp14
607	#define sigsetjmp_symname __sigsetjmp14
608	#else
609	#define setjmp_symname setjmp
610	#define sigsetjmp_symname sigsetjmp
611	#endif
612
613	DEFINE_REAL(int, setjmp_symname, void *env)
614	DEFINE_REAL(int, _setjmp, void *env)
615	DEFINE_REAL(int, sigsetjmp_symname, void *env)
616	#if !SANITIZER_NETBSD
617	DEFINE_REAL(int, __sigsetjmp, void *env)
618	#endif
619
620	// The real interceptor for setjmp is special, and implemented in pure asm. We
621	// just need to initialize the REAL functions so that they can be used in asm.
622	static void InitializeSetjmpInterceptors() {
623	// We can not use TSAN_INTERCEPT to get setjmp addr, because it does &setjmp and
624	// setjmp is not present in some versions of libc.
625	using __interception::InterceptFunction;
626	InterceptFunction(SANITIZER_STRINGIFY(setjmp_symname), ptr_to_real: (uptr*)&REAL(setjmp_symname), func: 0, trampoline: 0);
627	InterceptFunction(name: "_setjmp", ptr_to_real: (uptr*)&REAL(_setjmp), func: 0, trampoline: 0);
628	InterceptFunction(SANITIZER_STRINGIFY(sigsetjmp_symname), ptr_to_real: (uptr*)&REAL(sigsetjmp_symname), func: 0,
629	trampoline: 0);
630	#if !SANITIZER_NETBSD
631	InterceptFunction(name: "__sigsetjmp", ptr_to_real: (uptr*)&REAL(__sigsetjmp), func: 0, trampoline: 0);
632	#endif
633	}
634	#endif // SANITIZER_APPLE
635
636	#if SANITIZER_NETBSD
637	#define longjmp_symname __longjmp14
638	#define siglongjmp_symname __siglongjmp14
639	#else
640	#define longjmp_symname longjmp
641	#define siglongjmp_symname siglongjmp
642	#endif
643
644	TSAN_INTERCEPTOR(void, longjmp_symname, uptr *env, int val) {
645	// Note: if we call REAL(longjmp) in the context of ScopedInterceptor,
646	// bad things will happen. We will jump over ScopedInterceptor dtor and can
647	// leave thr->in_ignored_lib set.
648	{
649	SCOPED_INTERCEPTOR_RAW(longjmp_symname, env, val);
650	}
651	LongJmp(thr: cur_thread(), env);
652	REAL(longjmp_symname)(env, val);
653	}
654
655	TSAN_INTERCEPTOR(void, siglongjmp_symname, uptr *env, int val) {
656	{
657	SCOPED_INTERCEPTOR_RAW(siglongjmp_symname, env, val);
658	}
659	LongJmp(thr: cur_thread(), env);
660	REAL(siglongjmp_symname)(env, val);
661	}
662
663	#if SANITIZER_NETBSD
664	TSAN_INTERCEPTOR(void, _longjmp, uptr *env, int val) {
665	{
666	SCOPED_INTERCEPTOR_RAW(_longjmp, env, val);
667	}
668	LongJmp(cur_thread(), env);
669	REAL(_longjmp)(env, val);
670	}
671	#endif
672
673	#if !SANITIZER_APPLE
674	TSAN_INTERCEPTOR(void*, malloc, uptr size) {
675	if (in_symbolizer())
676	return InternalAlloc(size);
677	if (DlsymAlloc::Use())
678	return DlsymAlloc::Allocate(size_in_bytes: size);
679	void *p = 0;
680	{
681	SCOPED_INTERCEPTOR_RAW(malloc, size);
682	p = user_alloc(thr, pc, sz: size);
683	}
684	invoke_malloc_hook(ptr: p, size);
685	return p;
686	}
687
688	// In glibc<2.25, dynamic TLS blocks are allocated by __libc_memalign. Intercept
689	// __libc_memalign so that (1) we can detect races (2) free will not be called
690	// on libc internally allocated blocks.
691	TSAN_INTERCEPTOR(void*, __libc_memalign, uptr align, uptr sz) {
692	SCOPED_INTERCEPTOR_RAW(__libc_memalign, align, sz);
693	return user_memalign(thr, pc, align, sz);
694	}
695
696	TSAN_INTERCEPTOR(void *, calloc, uptr n, uptr size) {
697	if (in_symbolizer())
698	return InternalCalloc(count: n, size);
699	if (DlsymAlloc::Use())
700	return DlsymAlloc::Callocate(nmemb: n, size);
701	void *p = 0;
702	{
703	SCOPED_INTERCEPTOR_RAW(calloc, n, size);
704	p = user_calloc(thr, pc, sz: size, n);
705	}
706	invoke_malloc_hook(ptr: p, size: n * size);
707	return p;
708	}
709
710	TSAN_INTERCEPTOR(void*, realloc, void *p, uptr size) {
711	if (in_symbolizer())
712	return InternalRealloc(p, size);
713	if (DlsymAlloc::Use() || DlsymAlloc::PointerIsMine(ptr: p))
714	return DlsymAlloc::Realloc(ptr: p, new_size: size);
715	if (p)
716	invoke_free_hook(ptr: p);
717	{
718	SCOPED_INTERCEPTOR_RAW(realloc, p, size);
719	p = user_realloc(thr, pc, p, sz: size);
720	}
721	invoke_malloc_hook(ptr: p, size);
722	return p;
723	}
724
725	TSAN_INTERCEPTOR(void *, reallocarray, void *p, uptr n, uptr size) {
726	if (in_symbolizer())
727	return InternalReallocArray(p, count: n, size);
728	if (p)
729	invoke_free_hook(ptr: p);
730	{
731	SCOPED_INTERCEPTOR_RAW(reallocarray, p, n, size);
732	p = user_reallocarray(thr, pc, p, sz: size, n);
733	}
734	invoke_malloc_hook(ptr: p, size);
735	return p;
736	}
737
738	TSAN_INTERCEPTOR(void, free, void *p) {
739	if (UNLIKELY(!p))
740	return;
741	if (in_symbolizer())
742	return InternalFree(p);
743	if (DlsymAlloc::PointerIsMine(ptr: p))
744	return DlsymAlloc::Free(ptr: p);
745	invoke_free_hook(ptr: p);
746	SCOPED_INTERCEPTOR_RAW(free, p);
747	user_free(thr, pc, p);
748	}
749
750	TSAN_INTERCEPTOR(void, cfree, void *p) {
751	if (UNLIKELY(!p))
752	return;
753	if (in_symbolizer())
754	return InternalFree(p);
755	if (DlsymAlloc::PointerIsMine(ptr: p))
756	return DlsymAlloc::Free(ptr: p);
757	invoke_free_hook(ptr: p);
758	SCOPED_INTERCEPTOR_RAW(cfree, p);
759	user_free(thr, pc, p);
760	}
761
762	TSAN_INTERCEPTOR(uptr, malloc_usable_size, void *p) {
763	SCOPED_INTERCEPTOR_RAW(malloc_usable_size, p);
764	return user_alloc_usable_size(p);
765	}
766	#endif
767
768	TSAN_INTERCEPTOR(char *, strcpy, char *dst, const char *src) {
769	SCOPED_TSAN_INTERCEPTOR(strcpy, dst, src);
770	uptr srclen = internal_strlen(s: src);
771	MemoryAccessRange(thr, pc, addr: (uptr)dst, size: srclen + 1, is_write: true);
772	MemoryAccessRange(thr, pc, addr: (uptr)src, size: srclen + 1, is_write: false);
773	return REAL(strcpy)(dst, src);
774	}
775
776	TSAN_INTERCEPTOR(char*, strncpy, char *dst, char *src, usize n) {
777	SCOPED_TSAN_INTERCEPTOR(strncpy, dst, src, n);
778	uptr srclen = internal_strnlen(s: src, maxlen: n);
779	MemoryAccessRange(thr, pc, addr: (uptr)dst, size: n, is_write: true);
780	MemoryAccessRange(thr, pc, addr: (uptr)src, size: min(a: srclen + 1, b: n), is_write: false);
781	return REAL(strncpy)(dst, src, n);
782	}
783
784	TSAN_INTERCEPTOR(char*, strdup, const char *str) {
785	SCOPED_TSAN_INTERCEPTOR(strdup, str);
786	// strdup will call malloc, so no instrumentation is required here.
787	return REAL(strdup)(str);
788	}
789
790	// Zero out addr if it points into shadow memory and was provided as a hint
791	// only, i.e., MAP_FIXED is not set.
792	static bool fix_mmap_addr(void **addr, long_t sz, int flags) {
793	if (*addr) {
794	if (!IsAppMem(mem: (uptr)*addr) || !IsAppMem(mem: (uptr)*addr + sz - 1)) {
795	if (flags & MAP_FIXED) {
796	errno = errno_EINVAL;
797	return false;
798	} else {
799	*addr = 0;
800	}
801	}
802	}
803	return true;
804	}
805
806	template <class Mmap>
807	static void *mmap_interceptor(ThreadState *thr, uptr pc, Mmap real_mmap,
808	void *addr, SIZE_T sz, int prot, int flags,
809	int fd, OFF64_T off) {
810	if (!fix_mmap_addr(addr: &addr, sz, flags)) return MAP_FAILED;
811	void *res = real_mmap(addr, sz, prot, flags, fd, off);
812	if (res != MAP_FAILED) {
813	if (!IsAppMem(mem: (uptr)res) || !IsAppMem(mem: (uptr)res + sz - 1)) {
814	Report(format: "ThreadSanitizer: mmap at bad address: addr=%p size=%p res=%p\n",
815	addr, (void*)sz, res);
816	Die();
817	}
818	if (fd > 0) FdAccess(thr, pc, fd);
819	MemoryRangeImitateWriteOrResetRange(thr, pc, addr: (uptr)res, size: sz);
820	}
821	return res;
822	}
823
824	template <class Munmap>
825	static int munmap_interceptor(ThreadState *thr, uptr pc, Munmap real_munmap,
826	void *addr, SIZE_T sz) {
827	UnmapShadow(thr, addr: (uptr)addr, size: sz);
828	int res = real_munmap(addr, sz);
829	return res;
830	}
831
832	#if SANITIZER_LINUX
833	TSAN_INTERCEPTOR(void*, memalign, uptr align, uptr sz) {
834	SCOPED_INTERCEPTOR_RAW(memalign, align, sz);
835	return user_memalign(thr, pc, align, sz);
836	}
837	#define TSAN_MAYBE_INTERCEPT_MEMALIGN TSAN_INTERCEPT(memalign)
838	#else
839	#define TSAN_MAYBE_INTERCEPT_MEMALIGN
840	#endif
841
842	#if !SANITIZER_APPLE
843	TSAN_INTERCEPTOR(void*, aligned_alloc, uptr align, uptr sz) {
844	if (in_symbolizer())
845	return InternalAlloc(size: sz, cache: nullptr, alignment: align);
846	SCOPED_INTERCEPTOR_RAW(aligned_alloc, align, sz);
847	return user_aligned_alloc(thr, pc, align, sz);
848	}
849
850	TSAN_INTERCEPTOR(void*, valloc, uptr sz) {
851	if (in_symbolizer())
852	return InternalAlloc(size: sz, cache: nullptr, alignment: GetPageSizeCached());
853	SCOPED_INTERCEPTOR_RAW(valloc, sz);
854	return user_valloc(thr, pc, sz);
855	}
856	#endif
857
858	#if SANITIZER_LINUX
859	TSAN_INTERCEPTOR(void*, pvalloc, uptr sz) {
860	if (in_symbolizer()) {
861	uptr PageSize = GetPageSizeCached();
862	sz = sz ? RoundUpTo(size: sz, boundary: PageSize) : PageSize;
863	return InternalAlloc(size: sz, cache: nullptr, alignment: PageSize);
864	}
865	SCOPED_INTERCEPTOR_RAW(pvalloc, sz);
866	return user_pvalloc(thr, pc, sz);
867	}
868	#define TSAN_MAYBE_INTERCEPT_PVALLOC TSAN_INTERCEPT(pvalloc)
869	#else
870	#define TSAN_MAYBE_INTERCEPT_PVALLOC
871	#endif
872
873	#if !SANITIZER_APPLE
874	TSAN_INTERCEPTOR(int, posix_memalign, void **memptr, uptr align, uptr sz) {
875	if (in_symbolizer()) {
876	void *p = InternalAlloc(size: sz, cache: nullptr, alignment: align);
877	if (!p)
878	return errno_ENOMEM;
879	*memptr = p;
880	return 0;
881	}
882	SCOPED_INTERCEPTOR_RAW(posix_memalign, memptr, align, sz);
883	return user_posix_memalign(thr, pc, memptr, align, sz);
884	}
885	#endif
886
887	// Both __cxa_guard_acquire and pthread_once 0-initialize
888	// the object initially. pthread_once does not have any
889	// other ABI requirements. __cxa_guard_acquire assumes
890	// that any non-0 value in the first byte means that
891	// initialization is completed. Contents of the remaining
892	// bytes are up to us.
893	constexpr u32 kGuardInit = 0;
894	constexpr u32 kGuardDone = 1;
895	constexpr u32 kGuardRunning = 1 << 16;
896	constexpr u32 kGuardWaiter = 1 << 17;
897
898	static int guard_acquire(ThreadState *thr, uptr pc, atomic_uint32_t *g,
899	bool blocking_hooks = true) {
900	bool in_potentially_blocking_region = false;
901	auto on_exit = at_scope_exit(fn: [&] {
902	if (in_potentially_blocking_region)
903	OnPotentiallyBlockingRegionEnd();
904	});
905
906	for (;;) {
907	u32 cmp = atomic_load(a: g, mo: memory_order_acquire);
908	if (cmp == kGuardInit) {
909	if (atomic_compare_exchange_strong(a: g, cmp: &cmp, xchg: kGuardRunning,
910	mo: memory_order_relaxed))
911	return 1;
912	} else if (cmp == kGuardDone) {
913	if (!thr->in_ignored_lib)
914	Acquire(thr, pc, addr: (uptr)g);
915	return 0;
916	} else {
917	if ((cmp & kGuardWaiter) ||
918	atomic_compare_exchange_strong(a: g, cmp: &cmp, xchg: cmp | kGuardWaiter,
919	mo: memory_order_relaxed)) {
920	if (blocking_hooks && !in_potentially_blocking_region) {
921	in_potentially_blocking_region = true;
922	OnPotentiallyBlockingRegionBegin();
923	}
924	FutexWait(p: g, cmp: cmp | kGuardWaiter);
925	}
926	}
927	}
928	}
929
930	static void guard_release(ThreadState *thr, uptr pc, atomic_uint32_t *g,
931	u32 v) {
932	if (!thr->in_ignored_lib)
933	Release(thr, pc, addr: (uptr)g);
934	u32 old = atomic_exchange(a: g, v, mo: memory_order_release);
935	if (old & kGuardWaiter)
936	FutexWake(p: g, count: 1 << 30);
937	}
938
939	// __cxa_guard_acquire and friends need to be intercepted in a special way -
940	// regular interceptors will break statically-linked libstdc++. Linux
941	// interceptors are especially defined as weak functions (so that they don't
942	// cause link errors when user defines them as well). So they silently
943	// auto-disable themselves when such symbol is already present in the binary. If
944	// we link libstdc++ statically, it will bring own __cxa_guard_acquire which
945	// will silently replace our interceptor. That's why on Linux we simply export
946	// these interceptors with INTERFACE_ATTRIBUTE.
947	// On OS X, we don't support statically linking, so we just use a regular
948	// interceptor.
949	#if SANITIZER_APPLE
950	#define STDCXX_INTERCEPTOR TSAN_INTERCEPTOR
951	#else
952	#define STDCXX_INTERCEPTOR(rettype, name, ...) \
953	extern "C" rettype INTERFACE_ATTRIBUTE name(__VA_ARGS__)
954	#endif
955
956	// Used in thread-safe function static initialization.
957	STDCXX_INTERCEPTOR(int, __cxa_guard_acquire, atomic_uint32_t *g) {
958	SCOPED_INTERCEPTOR_RAW(__cxa_guard_acquire, g);
959	return guard_acquire(thr, pc, g);
960	}
961
962	STDCXX_INTERCEPTOR(void, __cxa_guard_release, atomic_uint32_t *g) {
963	SCOPED_INTERCEPTOR_RAW(__cxa_guard_release, g);
964	guard_release(thr, pc, g, v: kGuardDone);
965	}
966
967	STDCXX_INTERCEPTOR(void, __cxa_guard_abort, atomic_uint32_t *g) {
968	SCOPED_INTERCEPTOR_RAW(__cxa_guard_abort, g);
969	guard_release(thr, pc, g, v: kGuardInit);
970	}
971
972	namespace __tsan {
973	void DestroyThreadState() {
974	ThreadState *thr = cur_thread();
975	Processor *proc = thr->proc();
976	ThreadFinish(thr);
977	ProcUnwire(proc, thr);
978	ProcDestroy(proc);
979	DTLS_Destroy();
980	cur_thread_finalize();
981	}
982
983	void PlatformCleanUpThreadState(ThreadState *thr) {
984	ThreadSignalContext *sctx = (ThreadSignalContext *)atomic_load(
985	a: &thr->signal_ctx, mo: memory_order_relaxed);
986	if (sctx) {
987	atomic_store(a: &thr->signal_ctx, v: 0, mo: memory_order_relaxed);
988	sctx->oldset.Reset();
989	UnmapOrDie(addr: sctx, size: sizeof(*sctx));
990	}
991	}
992	} // namespace __tsan
993
994	#if !SANITIZER_APPLE && !SANITIZER_NETBSD && !SANITIZER_FREEBSD
995	static void thread_finalize(void *v) {
996	uptr iter = (uptr)v;
997	if (iter > 1) {
998	if (pthread_setspecific(key: interceptor_ctx()->finalize_key,
999	v: (void*)(iter - 1))) {
1000	Printf(format: "ThreadSanitizer: failed to set thread key\n");
1001	Die();
1002	}
1003	return;
1004	}
1005	DestroyThreadState();
1006	}
1007	#endif
1008
1009
1010	struct ThreadParam {
1011	void* (*callback)(void *arg);
1012	void *param;
1013	Tid tid;
1014	Semaphore created;
1015	Semaphore started;
1016	};
1017
1018	extern "C" void *__tsan_thread_start_func(void *arg) {
1019	ThreadParam *p = (ThreadParam*)arg;
1020	void* (*callback)(void *arg) = p->callback;
1021	void *param = p->param;
1022	{
1023	ThreadState *thr = cur_thread_init();
1024	// Thread-local state is not initialized yet.
1025	ScopedIgnoreInterceptors ignore;
1026	#if !SANITIZER_APPLE && !SANITIZER_NETBSD && !SANITIZER_FREEBSD
1027	ThreadIgnoreBegin(thr, pc: 0);
1028	if (pthread_setspecific(key: interceptor_ctx()->finalize_key,
1029	v: (void *)GetPthreadDestructorIterations())) {
1030	Printf(format: "ThreadSanitizer: failed to set thread key\n");
1031	Die();
1032	}
1033	ThreadIgnoreEnd(thr);
1034	#endif
1035	p->created.Wait();
1036	Processor *proc = ProcCreate();
1037	ProcWire(proc, thr);
1038	ThreadStart(thr, tid: p->tid, os_id: GetTid(), thread_type: ThreadType::Regular);
1039	p->started.Post();
1040	}
1041	void *res = callback(param);
1042	// Prevent the callback from being tail called,
1043	// it mixes up stack traces.
1044	volatile int foo = 42;
1045	foo++;
1046	return res;
1047	}
1048
1049	TSAN_INTERCEPTOR(int, pthread_create,
1050	void *th, void *attr, void *(*callback)(void*), void * param) {
1051	SCOPED_INTERCEPTOR_RAW(pthread_create, th, attr, callback, param);
1052
1053	MaybeSpawnBackgroundThread();
1054
1055	if (ctx->after_multithreaded_fork) {
1056	if (flags()->die_after_fork) {
1057	Report(format: "ThreadSanitizer: starting new threads after multi-threaded "
1058	"fork is not supported. Dying (set die_after_fork=0 to override)\n");
1059	Die();
1060	} else {
1061	VPrintf(1,
1062	"ThreadSanitizer: starting new threads after multi-threaded "
1063	"fork is not supported (pid %lu). Continuing because of "
1064	"die_after_fork=0, but you are on your own\n",
1065	internal_getpid());
1066	}
1067	}
1068	__sanitizer_pthread_attr_t myattr;
1069	if (attr == 0) {
1070	pthread_attr_init(attr: &myattr);
1071	attr = &myattr;
1072	}
1073	int detached = 0;
1074	REAL(pthread_attr_getdetachstate)(attr, &detached);
1075	AdjustStackSize(attr);
1076
1077	ThreadParam p;
1078	p.callback = callback;
1079	p.param = param;
1080	p.tid = kMainTid;
1081	int res = -1;
1082	{
1083	// Otherwise we see false positives in pthread stack manipulation.
1084	ScopedIgnoreInterceptors ignore;
1085	ThreadIgnoreBegin(thr, pc);
1086	res = REAL(pthread_create)(th, attr, __tsan_thread_start_func, &p);
1087	ThreadIgnoreEnd(thr);
1088	}
1089	if (res == 0) {
1090	p.tid = ThreadCreate(thr, pc, uid: *(uptr *)th, detached: IsStateDetached(state: detached));
1091	CHECK_NE(p.tid, kMainTid);
1092	// Synchronization on p.tid serves two purposes:
1093	// 1. ThreadCreate must finish before the new thread starts.
1094	// Otherwise the new thread can call pthread_detach, but the pthread_t
1095	// identifier is not yet registered in ThreadRegistry by ThreadCreate.
1096	// 2. ThreadStart must finish before this thread continues.
1097	// Otherwise, this thread can call pthread_detach and reset thr->sync
1098	// before the new thread got a chance to acquire from it in ThreadStart.
1099	p.created.Post();
1100	p.started.Wait();
1101	}
1102	if (attr == &myattr)
1103	pthread_attr_destroy(attr: &myattr);
1104	return res;
1105	}
1106
1107	TSAN_INTERCEPTOR(int, pthread_join, void *th, void **ret) {
1108	SCOPED_INTERCEPTOR_RAW(pthread_join, th, ret);
1109	Tid tid = ThreadConsumeTid(thr, pc, uid: (uptr)th);
1110	ThreadIgnoreBegin(thr, pc);
1111	int res = BLOCK_REAL(pthread_join)(th, ret);
1112	ThreadIgnoreEnd(thr);
1113	if (res == 0) {
1114	ThreadJoin(thr, pc, tid);
1115	}
1116	return res;
1117	}
1118
1119	// DEFINE_INTERNAL_PTHREAD_FUNCTIONS
1120	namespace __sanitizer {
1121	int internal_pthread_create(void *th, void *attr, void *(*callback)(void *),
1122	void *param) {
1123	ScopedIgnoreInterceptors ignore;
1124	return REAL(pthread_create)(th, attr, callback, param);
1125	}
1126	int internal_pthread_join(void *th, void **ret) {
1127	ScopedIgnoreInterceptors ignore;
1128	return REAL(pthread_join)(th, ret);
1129	}
1130	} // namespace __sanitizer
1131
1132	TSAN_INTERCEPTOR(int, pthread_detach, void *th) {
1133	SCOPED_INTERCEPTOR_RAW(pthread_detach, th);
1134	Tid tid = ThreadConsumeTid(thr, pc, uid: (uptr)th);
1135	int res = REAL(pthread_detach)(th);
1136	if (res == 0) {
1137	ThreadDetach(thr, pc, tid);
1138	}
1139	return res;
1140	}
1141
1142	TSAN_INTERCEPTOR(void, pthread_exit, void *retval) {
1143	{
1144	SCOPED_INTERCEPTOR_RAW(pthread_exit, retval);
1145	#if !SANITIZER_APPLE && !SANITIZER_ANDROID
1146	CHECK_EQ(thr, &cur_thread_placeholder);
1147	#endif
1148	}
1149	REAL(pthread_exit)(retval);
1150	}
1151
1152	#if SANITIZER_LINUX
1153	TSAN_INTERCEPTOR(int, pthread_tryjoin_np, void *th, void **ret) {
1154	SCOPED_INTERCEPTOR_RAW(pthread_tryjoin_np, th, ret);
1155	Tid tid = ThreadConsumeTid(thr, pc, uid: (uptr)th);
1156	ThreadIgnoreBegin(thr, pc);
1157	int res = REAL(pthread_tryjoin_np)(th, ret);
1158	ThreadIgnoreEnd(thr);
1159	if (res == 0)
1160	ThreadJoin(thr, pc, tid);
1161	else
1162	ThreadNotJoined(thr, pc, tid, uid: (uptr)th);
1163	return res;
1164	}
1165
1166	TSAN_INTERCEPTOR(int, pthread_timedjoin_np, void *th, void **ret,
1167	const struct timespec *abstime) {
1168	SCOPED_INTERCEPTOR_RAW(pthread_timedjoin_np, th, ret, abstime);
1169	Tid tid = ThreadConsumeTid(thr, pc, uid: (uptr)th);
1170	ThreadIgnoreBegin(thr, pc);
1171	int res = BLOCK_REAL(pthread_timedjoin_np)(th, ret, abstime);
1172	ThreadIgnoreEnd(thr);
1173	if (res == 0)
1174	ThreadJoin(thr, pc, tid);
1175	else
1176	ThreadNotJoined(thr, pc, tid, uid: (uptr)th);
1177	return res;
1178	}
1179	#endif
1180
1181	// Problem:
1182	// NPTL implementation of pthread_cond has 2 versions (2.2.5 and 2.3.2).
1183	// pthread_cond_t has different size in the different versions.
1184	// If call new REAL functions for old pthread_cond_t, they will corrupt memory
1185	// after pthread_cond_t (old cond is smaller).
1186	// If we call old REAL functions for new pthread_cond_t, we will lose some
1187	// functionality (e.g. old functions do not support waiting against
1188	// CLOCK_REALTIME).
1189	// Proper handling would require to have 2 versions of interceptors as well.
1190	// But this is messy, in particular requires linker scripts when sanitizer
1191	// runtime is linked into a shared library.
1192	// Instead we assume we don't have dynamic libraries built against old
1193	// pthread (2.2.5 is dated by 2002). And provide legacy_pthread_cond flag
1194	// that allows to work with old libraries (but this mode does not support
1195	// some features, e.g. pthread_condattr_getpshared).
1196	static void *init_cond(void *c, bool force = false) {
1197	// sizeof(pthread_cond_t) >= sizeof(uptr) in both versions.
1198	// So we allocate additional memory on the side large enough to hold
1199	// any pthread_cond_t object. Always call new REAL functions, but pass
1200	// the aux object to them.
1201	// Note: the code assumes that PTHREAD_COND_INITIALIZER initializes
1202	// first word of pthread_cond_t to zero.
1203	// It's all relevant only for linux.
1204	if (!common_flags()->legacy_pthread_cond)
1205	return c;
1206	atomic_uintptr_t *p = (atomic_uintptr_t*)c;
1207	uptr cond = atomic_load(a: p, mo: memory_order_acquire);
1208	if (!force && cond != 0)
1209	return (void*)cond;
1210	void *newcond = WRAP(malloc)(size: pthread_cond_t_sz);
1211	internal_memset(s: newcond, c: 0, n: pthread_cond_t_sz);
1212	if (atomic_compare_exchange_strong(a: p, cmp: &cond, xchg: (uptr)newcond,
1213	mo: memory_order_acq_rel))
1214	return newcond;
1215	WRAP(free)(p: newcond);
1216	return (void*)cond;
1217	}
1218
1219	namespace {
1220
1221	template <class Fn>
1222	struct CondMutexUnlockCtx {
1223	ScopedInterceptor *si;
1224	ThreadState *thr;
1225	uptr pc;
1226	void *m;
1227	void *c;
1228	const Fn &fn;
1229
1230	int Cancel() const { return fn(); }
1231	void Unlock() const;
1232	};
1233
1234	template <class Fn>
1235	void CondMutexUnlockCtx<Fn>::Unlock() const {
1236	// pthread_cond_wait interceptor has enabled async signal delivery
1237	// (see BlockingCall below). Disable async signals since we are running
1238	// tsan code. Also ScopedInterceptor and BlockingCall destructors won't run
1239	// since the thread is cancelled, so we have to manually execute them
1240	// (the thread still can run some user code due to pthread_cleanup_push).
1241	CHECK_EQ(atomic_load(&thr->in_blocking_func, memory_order_relaxed), 1);
1242	atomic_store(a: &thr->in_blocking_func, v: 0, mo: memory_order_relaxed);
1243	MutexPostLock(thr, pc, addr: (uptr)m, flagz: MutexFlagDoPreLockOnPostLock);
1244	// Undo BlockingCall ctor effects.
1245	thr->ignore_interceptors--;
1246	si->~ScopedInterceptor();
1247	}
1248	} // namespace
1249
1250	INTERCEPTOR(int, pthread_cond_init, void *c, void *a) {
1251	void *cond = init_cond(c, force: true);
1252	SCOPED_TSAN_INTERCEPTOR(pthread_cond_init, cond, a);
1253	MemoryAccessRange(thr, pc, addr: (uptr)c, size: sizeof(uptr), is_write: true);
1254	return REAL(pthread_cond_init)(cond, a);
1255	}
1256
1257	template <class Fn>
1258	int cond_wait(ThreadState *thr, uptr pc, ScopedInterceptor *si, const Fn &fn,
1259	void *c, void *m) {
1260	MemoryAccessRange(thr, pc, addr: (uptr)c, size: sizeof(uptr), is_write: false);
1261	MutexUnlock(thr, pc, addr: (uptr)m);
1262	int res = 0;
1263	// This ensures that we handle mutex lock even in case of pthread_cancel.
1264	// See test/tsan/cond_cancel.cpp.
1265	{
1266	// Enable signal delivery while the thread is blocked.
1267	BlockingCall bc(thr);
1268	CondMutexUnlockCtx<Fn> arg = {si, thr, pc, m, c, fn};
1269	res = call_pthread_cancel_with_cleanup(
1270	[](void *arg) -> int {
1271	return ((const CondMutexUnlockCtx<Fn> *)arg)->Cancel();
1272	},
1273	[](void *arg) { ((const CondMutexUnlockCtx<Fn> *)arg)->Unlock(); },
1274	&arg);
1275	}
1276	if (res == errno_EOWNERDEAD) MutexRepair(thr, pc, addr: (uptr)m);
1277	MutexPostLock(thr, pc, addr: (uptr)m, flagz: MutexFlagDoPreLockOnPostLock);
1278	return res;
1279	}
1280
1281	INTERCEPTOR(int, pthread_cond_wait, void *c, void *m) {
1282	void *cond = init_cond(c);
1283	SCOPED_TSAN_INTERCEPTOR(pthread_cond_wait, cond, m);
1284	return cond_wait(
1285	thr, pc, si: &si, fn: [=]() { return REAL(pthread_cond_wait)(cond, m); }, c: cond,
1286	m);
1287	}
1288
1289	INTERCEPTOR(int, pthread_cond_timedwait, void *c, void *m, void *abstime) {
1290	void *cond = init_cond(c);
1291	SCOPED_TSAN_INTERCEPTOR(pthread_cond_timedwait, cond, m, abstime);
1292	return cond_wait(
1293	thr, pc, si: &si,
1294	fn: [=]() { return REAL(pthread_cond_timedwait)(cond, m, abstime); }, c: cond,
1295	m);
1296	}
1297
1298	#if SANITIZER_LINUX
1299	INTERCEPTOR(int, pthread_cond_clockwait, void *c, void *m,
1300	__sanitizer_clockid_t clock, void *abstime) {
1301	void *cond = init_cond(c);
1302	SCOPED_TSAN_INTERCEPTOR(pthread_cond_clockwait, cond, m, clock, abstime);
1303	return cond_wait(
1304	thr, pc, si: &si,
1305	fn: [=]() { return REAL(pthread_cond_clockwait)(cond, m, clock, abstime); },
1306	c: cond, m);
1307	}
1308	#define TSAN_MAYBE_PTHREAD_COND_CLOCKWAIT TSAN_INTERCEPT(pthread_cond_clockwait)
1309	#else
1310	#define TSAN_MAYBE_PTHREAD_COND_CLOCKWAIT
1311	#endif
1312
1313	#if SANITIZER_APPLE
1314	INTERCEPTOR(int, pthread_cond_timedwait_relative_np, void *c, void *m,
1315	void *reltime) {
1316	void *cond = init_cond(c);
1317	SCOPED_TSAN_INTERCEPTOR(pthread_cond_timedwait_relative_np, cond, m, reltime);
1318	return cond_wait(
1319	thr, pc, &si,
1320	[=]() {
1321	return REAL(pthread_cond_timedwait_relative_np)(cond, m, reltime);
1322	},
1323	cond, m);
1324	}
1325	#endif
1326
1327	INTERCEPTOR(int, pthread_cond_signal, void *c) {
1328	void *cond = init_cond(c);
1329	SCOPED_TSAN_INTERCEPTOR(pthread_cond_signal, cond);
1330	MemoryAccessRange(thr, pc, addr: (uptr)c, size: sizeof(uptr), is_write: false);
1331	return REAL(pthread_cond_signal)(cond);
1332	}
1333
1334	INTERCEPTOR(int, pthread_cond_broadcast, void *c) {
1335	void *cond = init_cond(c);
1336	SCOPED_TSAN_INTERCEPTOR(pthread_cond_broadcast, cond);
1337	MemoryAccessRange(thr, pc, addr: (uptr)c, size: sizeof(uptr), is_write: false);
1338	return REAL(pthread_cond_broadcast)(cond);
1339	}
1340
1341	INTERCEPTOR(int, pthread_cond_destroy, void *c) {
1342	void *cond = init_cond(c);
1343	SCOPED_TSAN_INTERCEPTOR(pthread_cond_destroy, cond);
1344	MemoryAccessRange(thr, pc, addr: (uptr)c, size: sizeof(uptr), is_write: true);
1345	int res = REAL(pthread_cond_destroy)(cond);
1346	if (common_flags()->legacy_pthread_cond) {
1347	// Free our aux cond and zero the pointer to not leave dangling pointers.
1348	WRAP(free)(p: cond);
1349	atomic_store(a: (atomic_uintptr_t*)c, v: 0, mo: memory_order_relaxed);
1350	}
1351	return res;
1352	}
1353
1354	TSAN_INTERCEPTOR(int, pthread_mutex_init, void *m, void *a) {
1355	SCOPED_TSAN_INTERCEPTOR(pthread_mutex_init, m, a);
1356	int res = REAL(pthread_mutex_init)(m, a);
1357	if (res == 0) {
1358	u32 flagz = 0;
1359	if (a) {
1360	int type = 0;
1361	if (REAL(pthread_mutexattr_gettype)(a, &type) == 0)
1362	if (type == PTHREAD_MUTEX_RECURSIVE ||
1363	type == PTHREAD_MUTEX_RECURSIVE_NP)
1364	flagz |= MutexFlagWriteReentrant;
1365	}
1366	MutexCreate(thr, pc, addr: (uptr)m, flagz);
1367	}
1368	return res;
1369	}
1370
1371	TSAN_INTERCEPTOR(int, pthread_mutex_destroy, void *m) {
1372	SCOPED_TSAN_INTERCEPTOR(pthread_mutex_destroy, m);
1373	int res = REAL(pthread_mutex_destroy)(m);
1374	if (res == 0 || res == errno_EBUSY) {
1375	MutexDestroy(thr, pc, addr: (uptr)m);
1376	}
1377	return res;
1378	}
1379
1380	TSAN_INTERCEPTOR(int, pthread_mutex_lock, void *m) {
1381	SCOPED_TSAN_INTERCEPTOR(pthread_mutex_lock, m);
1382	MutexPreLock(thr, pc, addr: (uptr)m);
1383	int res = BLOCK_REAL(pthread_mutex_lock)(m);
1384	if (res == errno_EOWNERDEAD)
1385	MutexRepair(thr, pc, addr: (uptr)m);
1386	if (res == 0 || res == errno_EOWNERDEAD)
1387	MutexPostLock(thr, pc, addr: (uptr)m);
1388	if (res == errno_EINVAL)
1389	MutexInvalidAccess(thr, pc, addr: (uptr)m);
1390	return res;
1391	}
1392
1393	TSAN_INTERCEPTOR(int, pthread_mutex_trylock, void *m) {
1394	SCOPED_TSAN_INTERCEPTOR(pthread_mutex_trylock, m);
1395	int res = REAL(pthread_mutex_trylock)(m);
1396	if (res == errno_EOWNERDEAD)
1397	MutexRepair(thr, pc, addr: (uptr)m);
1398	if (res == 0 || res == errno_EOWNERDEAD)
1399	MutexPostLock(thr, pc, addr: (uptr)m, flagz: MutexFlagTryLock);
1400	return res;
1401	}
1402
1403	#if !SANITIZER_APPLE
1404	TSAN_INTERCEPTOR(int, pthread_mutex_timedlock, void *m, void *abstime) {
1405	SCOPED_TSAN_INTERCEPTOR(pthread_mutex_timedlock, m, abstime);
1406	int res = REAL(pthread_mutex_timedlock)(m, abstime);
1407	if (res == 0) {
1408	MutexPostLock(thr, pc, addr: (uptr)m, flagz: MutexFlagTryLock);
1409	}
1410	return res;
1411	}
1412	#endif
1413
1414	TSAN_INTERCEPTOR(int, pthread_mutex_unlock, void *m) {
1415	SCOPED_TSAN_INTERCEPTOR(pthread_mutex_unlock, m);
1416	MutexUnlock(thr, pc, addr: (uptr)m);
1417	int res = REAL(pthread_mutex_unlock)(m);
1418	if (res == errno_EINVAL)
1419	MutexInvalidAccess(thr, pc, addr: (uptr)m);
1420	return res;
1421	}
1422
1423	#if SANITIZER_LINUX
1424	TSAN_INTERCEPTOR(int, pthread_mutex_clocklock, void *m,
1425	__sanitizer_clockid_t clock, void *abstime) {
1426	SCOPED_TSAN_INTERCEPTOR(pthread_mutex_clocklock, m, clock, abstime);
1427	MutexPreLock(thr, pc, addr: (uptr)m);
1428	int res = BLOCK_REAL(pthread_mutex_clocklock)(m, clock, abstime);
1429	if (res == errno_EOWNERDEAD)
1430	MutexRepair(thr, pc, addr: (uptr)m);
1431	if (res == 0 || res == errno_EOWNERDEAD)
1432	MutexPostLock(thr, pc, addr: (uptr)m);
1433	if (res == errno_EINVAL)
1434	MutexInvalidAccess(thr, pc, addr: (uptr)m);
1435	return res;
1436	}
1437	#endif
1438
1439	#if SANITIZER_GLIBC
1440	# if !__GLIBC_PREREQ(2, 34)
1441	// glibc 2.34 applies a non-default version for the two functions. They are no
1442	// longer expected to be intercepted by programs.
1443	TSAN_INTERCEPTOR(int, __pthread_mutex_lock, void *m) {
1444	SCOPED_TSAN_INTERCEPTOR(__pthread_mutex_lock, m);
1445	MutexPreLock(thr, pc, (uptr)m);
1446	int res = BLOCK_REAL(__pthread_mutex_lock)(m);
1447	if (res == errno_EOWNERDEAD)
1448	MutexRepair(thr, pc, (uptr)m);
1449	if (res == 0 || res == errno_EOWNERDEAD)
1450	MutexPostLock(thr, pc, (uptr)m);
1451	if (res == errno_EINVAL)
1452	MutexInvalidAccess(thr, pc, (uptr)m);
1453	return res;
1454	}
1455
1456	TSAN_INTERCEPTOR(int, __pthread_mutex_unlock, void *m) {
1457	SCOPED_TSAN_INTERCEPTOR(__pthread_mutex_unlock, m);
1458	MutexUnlock(thr, pc, (uptr)m);
1459	int res = REAL(__pthread_mutex_unlock)(m);
1460	if (res == errno_EINVAL)
1461	MutexInvalidAccess(thr, pc, (uptr)m);
1462	return res;
1463	}
1464	# endif
1465	#endif
1466
1467	#if !SANITIZER_APPLE
1468	TSAN_INTERCEPTOR(int, pthread_spin_init, void *m, int pshared) {
1469	SCOPED_TSAN_INTERCEPTOR(pthread_spin_init, m, pshared);
1470	int res = REAL(pthread_spin_init)(m, pshared);
1471	if (res == 0) {
1472	MutexCreate(thr, pc, addr: (uptr)m);
1473	}
1474	return res;
1475	}
1476
1477	TSAN_INTERCEPTOR(int, pthread_spin_destroy, void *m) {
1478	SCOPED_TSAN_INTERCEPTOR(pthread_spin_destroy, m);
1479	int res = REAL(pthread_spin_destroy)(m);
1480	if (res == 0) {
1481	MutexDestroy(thr, pc, addr: (uptr)m);
1482	}
1483	return res;
1484	}
1485
1486	TSAN_INTERCEPTOR(int, pthread_spin_lock, void *m) {
1487	SCOPED_TSAN_INTERCEPTOR(pthread_spin_lock, m);
1488	MutexPreLock(thr, pc, addr: (uptr)m);
1489	int res = BLOCK_REAL(pthread_spin_lock)(m);
1490	if (res == 0) {
1491	MutexPostLock(thr, pc, addr: (uptr)m);
1492	}
1493	return res;
1494	}
1495
1496	TSAN_INTERCEPTOR(int, pthread_spin_trylock, void *m) {
1497	SCOPED_TSAN_INTERCEPTOR(pthread_spin_trylock, m);
1498	int res = REAL(pthread_spin_trylock)(m);
1499	if (res == 0) {
1500	MutexPostLock(thr, pc, addr: (uptr)m, flagz: MutexFlagTryLock);
1501	}
1502	return res;
1503	}
1504
1505	TSAN_INTERCEPTOR(int, pthread_spin_unlock, void *m) {
1506	SCOPED_TSAN_INTERCEPTOR(pthread_spin_unlock, m);
1507	MutexUnlock(thr, pc, addr: (uptr)m);
1508	int res = REAL(pthread_spin_unlock)(m);
1509	return res;
1510	}
1511	#endif
1512
1513	TSAN_INTERCEPTOR(int, pthread_rwlock_init, void *m, void *a) {
1514	SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_init, m, a);
1515	int res = REAL(pthread_rwlock_init)(m, a);
1516	if (res == 0) {
1517	MutexCreate(thr, pc, addr: (uptr)m);
1518	}
1519	return res;
1520	}
1521
1522	TSAN_INTERCEPTOR(int, pthread_rwlock_destroy, void *m) {
1523	SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_destroy, m);
1524	int res = REAL(pthread_rwlock_destroy)(m);
1525	if (res == 0) {
1526	MutexDestroy(thr, pc, addr: (uptr)m);
1527	}
1528	return res;
1529	}
1530
1531	TSAN_INTERCEPTOR(int, pthread_rwlock_rdlock, void *m) {
1532	SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_rdlock, m);
1533	MutexPreReadLock(thr, pc, addr: (uptr)m);
1534	int res = REAL(pthread_rwlock_rdlock)(m);
1535	if (res == 0) {
1536	MutexPostReadLock(thr, pc, addr: (uptr)m);
1537	}
1538	return res;
1539	}
1540
1541	TSAN_INTERCEPTOR(int, pthread_rwlock_tryrdlock, void *m) {
1542	SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_tryrdlock, m);
1543	int res = REAL(pthread_rwlock_tryrdlock)(m);
1544	if (res == 0) {
1545	MutexPostReadLock(thr, pc, addr: (uptr)m, flagz: MutexFlagTryLock);
1546	}
1547	return res;
1548	}
1549
1550	#if !SANITIZER_APPLE
1551	TSAN_INTERCEPTOR(int, pthread_rwlock_timedrdlock, void *m, void *abstime) {
1552	SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedrdlock, m, abstime);
1553	int res = REAL(pthread_rwlock_timedrdlock)(m, abstime);
1554	if (res == 0) {
1555	MutexPostReadLock(thr, pc, addr: (uptr)m);
1556	}
1557	return res;
1558	}
1559	#endif
1560
1561	TSAN_INTERCEPTOR(int, pthread_rwlock_wrlock, void *m) {
1562	SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_wrlock, m);
1563	MutexPreLock(thr, pc, addr: (uptr)m);
1564	int res = BLOCK_REAL(pthread_rwlock_wrlock)(m);
1565	if (res == 0) {
1566	MutexPostLock(thr, pc, addr: (uptr)m);
1567	}
1568	return res;
1569	}
1570
1571	TSAN_INTERCEPTOR(int, pthread_rwlock_trywrlock, void *m) {
1572	SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_trywrlock, m);
1573	int res = REAL(pthread_rwlock_trywrlock)(m);
1574	if (res == 0) {
1575	MutexPostLock(thr, pc, addr: (uptr)m, flagz: MutexFlagTryLock);
1576	}
1577	return res;
1578	}
1579
1580	#if !SANITIZER_APPLE
1581	TSAN_INTERCEPTOR(int, pthread_rwlock_timedwrlock, void *m, void *abstime) {
1582	SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedwrlock, m, abstime);
1583	int res = REAL(pthread_rwlock_timedwrlock)(m, abstime);
1584	if (res == 0) {
1585	MutexPostLock(thr, pc, addr: (uptr)m, flagz: MutexFlagTryLock);
1586	}
1587	return res;
1588	}
1589	#endif
1590
1591	TSAN_INTERCEPTOR(int, pthread_rwlock_unlock, void *m) {
1592	SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_unlock, m);
1593	MutexReadOrWriteUnlock(thr, pc, addr: (uptr)m);
1594	int res = REAL(pthread_rwlock_unlock)(m);
1595	return res;
1596	}
1597
1598	#if !SANITIZER_APPLE
1599	TSAN_INTERCEPTOR(int, pthread_barrier_init, void *b, void *a, unsigned count) {
1600	SCOPED_TSAN_INTERCEPTOR(pthread_barrier_init, b, a, count);
1601	MemoryAccess(thr, pc, addr: (uptr)b, size: 1, typ: kAccessWrite);
1602	int res = REAL(pthread_barrier_init)(b, a, count);
1603	return res;
1604	}
1605
1606	TSAN_INTERCEPTOR(int, pthread_barrier_destroy, void *b) {
1607	SCOPED_TSAN_INTERCEPTOR(pthread_barrier_destroy, b);
1608	MemoryAccess(thr, pc, addr: (uptr)b, size: 1, typ: kAccessWrite);
1609	int res = REAL(pthread_barrier_destroy)(b);
1610	return res;
1611	}
1612
1613	TSAN_INTERCEPTOR(int, pthread_barrier_wait, void *b) {
1614	SCOPED_TSAN_INTERCEPTOR(pthread_barrier_wait, b);
1615	Release(thr, pc, addr: (uptr)b);
1616	MemoryAccess(thr, pc, addr: (uptr)b, size: 1, typ: kAccessRead);
1617	int res = REAL(pthread_barrier_wait)(b);
1618	MemoryAccess(thr, pc, addr: (uptr)b, size: 1, typ: kAccessRead);
1619	if (res == 0 || res == PTHREAD_BARRIER_SERIAL_THREAD) {
1620	Acquire(thr, pc, addr: (uptr)b);
1621	}
1622	return res;
1623	}
1624	#endif
1625
1626	TSAN_INTERCEPTOR(int, pthread_once, void *o, void (*f)()) {
1627	SCOPED_INTERCEPTOR_RAW(pthread_once, o, f);
1628	if (o == 0 || f == 0)
1629	return errno_EINVAL;
1630	atomic_uint32_t *a;
1631
1632	if (SANITIZER_APPLE)
1633	a = static_cast<atomic_uint32_t*>((void *)((char *)o + sizeof(long_t)));
1634	else if (SANITIZER_NETBSD)
1635	a = static_cast<atomic_uint32_t*>
1636	((void *)((char *)o + __sanitizer::pthread_mutex_t_sz));
1637	else
1638	a = static_cast<atomic_uint32_t*>(o);
1639
1640	// Mac OS X appears to use pthread_once() where calling BlockingRegion hooks
1641	// result in crashes due to too little stack space.
1642	if (guard_acquire(thr, pc, g: a, blocking_hooks: !SANITIZER_APPLE)) {
1643	(*f)();
1644	guard_release(thr, pc, g: a, v: kGuardDone);
1645	}
1646	return 0;
1647	}
1648
1649	#if SANITIZER_GLIBC
1650	TSAN_INTERCEPTOR(int, __fxstat, int version, int fd, void *buf) {
1651	SCOPED_TSAN_INTERCEPTOR(__fxstat, version, fd, buf);
1652	if (fd > 0)
1653	FdAccess(thr, pc, fd);
1654	return REAL(__fxstat)(version, fd, buf);
1655	}
1656
1657	TSAN_INTERCEPTOR(int, __fxstat64, int version, int fd, void *buf) {
1658	SCOPED_TSAN_INTERCEPTOR(__fxstat64, version, fd, buf);
1659	if (fd > 0)
1660	FdAccess(thr, pc, fd);
1661	return REAL(__fxstat64)(version, fd, buf);
1662	}
1663	#define TSAN_MAYBE_INTERCEPT___FXSTAT TSAN_INTERCEPT(__fxstat); TSAN_INTERCEPT(__fxstat64)
1664	#else
1665	#define TSAN_MAYBE_INTERCEPT___FXSTAT
1666	#endif
1667
1668	#if !SANITIZER_GLIBC || __GLIBC_PREREQ(2, 33)
1669	TSAN_INTERCEPTOR(int, fstat, int fd, void *buf) {
1670	SCOPED_TSAN_INTERCEPTOR(fstat, fd, buf);
1671	if (fd > 0)
1672	FdAccess(thr, pc, fd);
1673	return REAL(fstat)(fd, buf);
1674	}
1675	# define TSAN_MAYBE_INTERCEPT_FSTAT TSAN_INTERCEPT(fstat)
1676	#else
1677	# define TSAN_MAYBE_INTERCEPT_FSTAT
1678	#endif
1679
1680	#if __GLIBC_PREREQ(2, 33)
1681	TSAN_INTERCEPTOR(int, fstat64, int fd, void *buf) {
1682	SCOPED_TSAN_INTERCEPTOR(fstat64, fd, buf);
1683	if (fd > 0)
1684	FdAccess(thr, pc, fd);
1685	return REAL(fstat64)(fd, buf);
1686	}
1687	# define TSAN_MAYBE_INTERCEPT_FSTAT64 TSAN_INTERCEPT(fstat64)
1688	#else
1689	# define TSAN_MAYBE_INTERCEPT_FSTAT64
1690	#endif
1691
1692	TSAN_INTERCEPTOR(int, open, const char *name, int oflag, ...) {
1693	mode_t mode = 0;
1694	if (OpenReadsVaArgs(oflag)) {
1695	va_list ap;
1696	va_start(ap, oflag);
1697	mode = va_arg(ap, int);
1698	va_end(ap);
1699	}
1700
1701	SCOPED_TSAN_INTERCEPTOR(open, name, oflag, mode);
1702	READ_STRING(thr, pc, name, 0);
1703
1704	int fd;
1705	if (OpenReadsVaArgs(oflag))
1706	fd = REAL(open)(name, oflag, mode);
1707	else
1708	fd = REAL(open)(name, oflag);
1709
1710	if (fd >= 0)
1711	FdFileCreate(thr, pc, fd);
1712	return fd;
1713	}
1714
1715	#if SANITIZER_LINUX
1716	TSAN_INTERCEPTOR(int, open64, const char *name, int oflag, ...) {
1717	va_list ap;
1718	va_start(ap, oflag);
1719	mode_t mode = va_arg(ap, int);
1720	va_end(ap);
1721	SCOPED_TSAN_INTERCEPTOR(open64, name, oflag, mode);
1722	READ_STRING(thr, pc, name, 0);
1723	int fd = REAL(open64)(name, oflag, mode);
1724	if (fd >= 0)
1725	FdFileCreate(thr, pc, fd);
1726	return fd;
1727	}
1728	#define TSAN_MAYBE_INTERCEPT_OPEN64 TSAN_INTERCEPT(open64)
1729	#else
1730	#define TSAN_MAYBE_INTERCEPT_OPEN64
1731	#endif
1732
1733	TSAN_INTERCEPTOR(int, creat, const char *name, int mode) {
1734	SCOPED_TSAN_INTERCEPTOR(creat, name, mode);
1735	READ_STRING(thr, pc, name, 0);
1736	int fd = REAL(creat)(name, mode);
1737	if (fd >= 0)
1738	FdFileCreate(thr, pc, fd);
1739	return fd;
1740	}
1741
1742	#if SANITIZER_LINUX
1743	TSAN_INTERCEPTOR(int, creat64, const char *name, int mode) {
1744	SCOPED_TSAN_INTERCEPTOR(creat64, name, mode);
1745	READ_STRING(thr, pc, name, 0);
1746	int fd = REAL(creat64)(name, mode);
1747	if (fd >= 0)
1748	FdFileCreate(thr, pc, fd);
1749	return fd;
1750	}
1751	#define TSAN_MAYBE_INTERCEPT_CREAT64 TSAN_INTERCEPT(creat64)
1752	#else
1753	#define TSAN_MAYBE_INTERCEPT_CREAT64
1754	#endif
1755
1756	TSAN_INTERCEPTOR(int, dup, int oldfd) {
1757	SCOPED_TSAN_INTERCEPTOR(dup, oldfd);
1758	int newfd = REAL(dup)(oldfd);
1759	if (oldfd >= 0 && newfd >= 0 && newfd != oldfd)
1760	FdDup(thr, pc, oldfd, newfd, write: true);
1761	return newfd;
1762	}
1763
1764	TSAN_INTERCEPTOR(int, dup2, int oldfd, int newfd) {
1765	SCOPED_TSAN_INTERCEPTOR(dup2, oldfd, newfd);
1766	int newfd2 = REAL(dup2)(oldfd, newfd);
1767	if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
1768	FdDup(thr, pc, oldfd, newfd: newfd2, write: false);
1769	return newfd2;
1770	}
1771
1772	#if !SANITIZER_APPLE
1773	TSAN_INTERCEPTOR(int, dup3, int oldfd, int newfd, int flags) {
1774	SCOPED_TSAN_INTERCEPTOR(dup3, oldfd, newfd, flags);
1775	int newfd2 = REAL(dup3)(oldfd, newfd, flags);
1776	if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
1777	FdDup(thr, pc, oldfd, newfd: newfd2, write: false);
1778	return newfd2;
1779	}
1780	#endif
1781
1782	#if SANITIZER_LINUX
1783	TSAN_INTERCEPTOR(int, eventfd, unsigned initval, int flags) {
1784	SCOPED_TSAN_INTERCEPTOR(eventfd, initval, flags);
1785	int fd = REAL(eventfd)(initval, flags);
1786	if (fd >= 0)
1787	FdEventCreate(thr, pc, fd);
1788	return fd;
1789	}
1790	#define TSAN_MAYBE_INTERCEPT_EVENTFD TSAN_INTERCEPT(eventfd)
1791	#else
1792	#define TSAN_MAYBE_INTERCEPT_EVENTFD
1793	#endif
1794
1795	#if SANITIZER_LINUX
1796	TSAN_INTERCEPTOR(int, signalfd, int fd, void *mask, int flags) {
1797	SCOPED_INTERCEPTOR_RAW(signalfd, fd, mask, flags);
1798	FdClose(thr, pc, fd);
1799	fd = REAL(signalfd)(fd, mask, flags);
1800	if (!MustIgnoreInterceptor(thr))
1801	FdSignalCreate(thr, pc, fd);
1802	return fd;
1803	}
1804	#define TSAN_MAYBE_INTERCEPT_SIGNALFD TSAN_INTERCEPT(signalfd)
1805	#else
1806	#define TSAN_MAYBE_INTERCEPT_SIGNALFD
1807	#endif
1808
1809	#if SANITIZER_LINUX
1810	TSAN_INTERCEPTOR(int, inotify_init, int fake) {
1811	SCOPED_TSAN_INTERCEPTOR(inotify_init, fake);
1812	int fd = REAL(inotify_init)(fake);
1813	if (fd >= 0)
1814	FdInotifyCreate(thr, pc, fd);
1815	return fd;
1816	}
1817	#define TSAN_MAYBE_INTERCEPT_INOTIFY_INIT TSAN_INTERCEPT(inotify_init)
1818	#else
1819	#define TSAN_MAYBE_INTERCEPT_INOTIFY_INIT
1820	#endif
1821
1822	#if SANITIZER_LINUX
1823	TSAN_INTERCEPTOR(int, inotify_init1, int flags) {
1824	SCOPED_TSAN_INTERCEPTOR(inotify_init1, flags);
1825	int fd = REAL(inotify_init1)(flags);
1826	if (fd >= 0)
1827	FdInotifyCreate(thr, pc, fd);
1828	return fd;
1829	}
1830	#define TSAN_MAYBE_INTERCEPT_INOTIFY_INIT1 TSAN_INTERCEPT(inotify_init1)
1831	#else
1832	#define TSAN_MAYBE_INTERCEPT_INOTIFY_INIT1
1833	#endif
1834
1835	TSAN_INTERCEPTOR(int, socket, int domain, int type, int protocol) {
1836	SCOPED_TSAN_INTERCEPTOR(socket, domain, type, protocol);
1837	int fd = REAL(socket)(domain, type, protocol);
1838	if (fd >= 0)
1839	FdSocketCreate(thr, pc, fd);
1840	return fd;
1841	}
1842
1843	TSAN_INTERCEPTOR(int, socketpair, int domain, int type, int protocol, int *fd) {
1844	SCOPED_TSAN_INTERCEPTOR(socketpair, domain, type, protocol, fd);
1845	int res = REAL(socketpair)(domain, type, protocol, fd);
1846	if (res == 0 && fd[0] >= 0 && fd[1] >= 0)
1847	FdPipeCreate(thr, pc, rfd: fd[0], wfd: fd[1]);
1848	return res;
1849	}
1850
1851	TSAN_INTERCEPTOR(int, connect, int fd, void *addr, unsigned addrlen) {
1852	SCOPED_TSAN_INTERCEPTOR(connect, fd, addr, addrlen);
1853	FdSocketConnecting(thr, pc, fd);
1854	int res = REAL(connect)(fd, addr, addrlen);
1855	if (res == 0 && fd >= 0)
1856	FdSocketConnect(thr, pc, fd);
1857	return res;
1858	}
1859
1860	TSAN_INTERCEPTOR(int, bind, int fd, void *addr, unsigned addrlen) {
1861	SCOPED_TSAN_INTERCEPTOR(bind, fd, addr, addrlen);
1862	int res = REAL(bind)(fd, addr, addrlen);
1863	if (fd > 0 && res == 0)
1864	FdAccess(thr, pc, fd);
1865	return res;
1866	}
1867
1868	TSAN_INTERCEPTOR(int, listen, int fd, int backlog) {
1869	SCOPED_TSAN_INTERCEPTOR(listen, fd, backlog);
1870	int res = REAL(listen)(fd, backlog);
1871	if (fd > 0 && res == 0)
1872	FdAccess(thr, pc, fd);
1873	return res;
1874	}
1875
1876	TSAN_INTERCEPTOR(int, close, int fd) {
1877	SCOPED_INTERCEPTOR_RAW(close, fd);
1878	if (!in_symbolizer())
1879	FdClose(thr, pc, fd);
1880	return REAL(close)(fd);
1881	}
1882
1883	#if SANITIZER_LINUX
1884	TSAN_INTERCEPTOR(int, __close, int fd) {
1885	SCOPED_INTERCEPTOR_RAW(__close, fd);
1886	FdClose(thr, pc, fd);
1887	return REAL(__close)(fd);
1888	}
1889	#define TSAN_MAYBE_INTERCEPT___CLOSE TSAN_INTERCEPT(__close)
1890	#else
1891	#define TSAN_MAYBE_INTERCEPT___CLOSE
1892	#endif
1893
1894	// glibc guts
1895	#if SANITIZER_LINUX && !SANITIZER_ANDROID
1896	TSAN_INTERCEPTOR(void, __res_iclose, void *state, bool free_addr) {
1897	SCOPED_INTERCEPTOR_RAW(__res_iclose, state, free_addr);
1898	int fds[64];
1899	int cnt = ExtractResolvFDs(state, fds, ARRAY_SIZE(fds));
1900	for (int i = 0; i < cnt; i++) FdClose(thr, pc, fd: fds[i]);
1901	REAL(__res_iclose)(state, free_addr);
1902	}
1903	#define TSAN_MAYBE_INTERCEPT___RES_ICLOSE TSAN_INTERCEPT(__res_iclose)
1904	#else
1905	#define TSAN_MAYBE_INTERCEPT___RES_ICLOSE
1906	#endif
1907
1908	TSAN_INTERCEPTOR(int, pipe, int *pipefd) {
1909	SCOPED_TSAN_INTERCEPTOR(pipe, pipefd);
1910	int res = REAL(pipe)(pipefd);
1911	if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
1912	FdPipeCreate(thr, pc, rfd: pipefd[0], wfd: pipefd[1]);
1913	return res;
1914	}
1915
1916	#if !SANITIZER_APPLE
1917	TSAN_INTERCEPTOR(int, pipe2, int *pipefd, int flags) {
1918	SCOPED_TSAN_INTERCEPTOR(pipe2, pipefd, flags);
1919	int res = REAL(pipe2)(pipefd, flags);
1920	if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
1921	FdPipeCreate(thr, pc, rfd: pipefd[0], wfd: pipefd[1]);
1922	return res;
1923	}
1924	#endif
1925
1926	TSAN_INTERCEPTOR(int, unlink, char *path) {
1927	SCOPED_TSAN_INTERCEPTOR(unlink, path);
1928	Release(thr, pc, addr: File2addr(path));
1929	int res = REAL(unlink)(path);
1930	return res;
1931	}
1932
1933	TSAN_INTERCEPTOR(void*, tmpfile, int fake) {
1934	SCOPED_TSAN_INTERCEPTOR(tmpfile, fake);
1935	void *res = REAL(tmpfile)(fake);
1936	if (res) {
1937	int fd = fileno_unlocked(stream: res);
1938	if (fd >= 0)
1939	FdFileCreate(thr, pc, fd);
1940	}
1941	return res;
1942	}
1943
1944	#if SANITIZER_LINUX
1945	TSAN_INTERCEPTOR(void*, tmpfile64, int fake) {
1946	SCOPED_TSAN_INTERCEPTOR(tmpfile64, fake);
1947	void *res = REAL(tmpfile64)(fake);
1948	if (res) {
1949	int fd = fileno_unlocked(stream: res);
1950	if (fd >= 0)
1951	FdFileCreate(thr, pc, fd);
1952	}
1953	return res;
1954	}
1955	#define TSAN_MAYBE_INTERCEPT_TMPFILE64 TSAN_INTERCEPT(tmpfile64)
1956	#else
1957	#define TSAN_MAYBE_INTERCEPT_TMPFILE64
1958	#endif
1959
1960	static void FlushStreams() {
1961	// Flushing all the streams here may freeze the process if a child thread is
1962	// performing file stream operations at the same time.
1963	REAL(fflush)(stdout);
1964	REAL(fflush)(stderr);
1965	}
1966
1967	TSAN_INTERCEPTOR(void, abort, int fake) {
1968	SCOPED_TSAN_INTERCEPTOR(abort, fake);
1969	FlushStreams();
1970	REAL(abort)(fake);
1971	}
1972
1973	TSAN_INTERCEPTOR(int, rmdir, char *path) {
1974	SCOPED_TSAN_INTERCEPTOR(rmdir, path);
1975	Release(thr, pc, addr: Dir2addr(path));
1976	int res = REAL(rmdir)(path);
1977	return res;
1978	}
1979
1980	TSAN_INTERCEPTOR(int, closedir, void *dirp) {
1981	SCOPED_INTERCEPTOR_RAW(closedir, dirp);
1982	if (dirp) {
1983	int fd = dirfd(dirp);
1984	FdClose(thr, pc, fd);
1985	}
1986	return REAL(closedir)(dirp);
1987	}
1988
1989	#if SANITIZER_LINUX
1990	TSAN_INTERCEPTOR(int, epoll_create, int size) {
1991	SCOPED_TSAN_INTERCEPTOR(epoll_create, size);
1992	int fd = REAL(epoll_create)(size);
1993	if (fd >= 0)
1994	FdPollCreate(thr, pc, fd);
1995	return fd;
1996	}
1997
1998	TSAN_INTERCEPTOR(int, epoll_create1, int flags) {
1999	SCOPED_TSAN_INTERCEPTOR(epoll_create1, flags);
2000	int fd = REAL(epoll_create1)(flags);
2001	if (fd >= 0)
2002	FdPollCreate(thr, pc, fd);
2003	return fd;
2004	}
2005
2006	TSAN_INTERCEPTOR(int, epoll_ctl, int epfd, int op, int fd, void *ev) {
2007	SCOPED_TSAN_INTERCEPTOR(epoll_ctl, epfd, op, fd, ev);
2008	if (epfd >= 0)
2009	FdAccess(thr, pc, fd: epfd);
2010	if (epfd >= 0 && fd >= 0)
2011	FdAccess(thr, pc, fd);
2012	if (op == EPOLL_CTL_ADD && epfd >= 0) {
2013	FdPollAdd(thr, pc, epfd, fd);
2014	FdRelease(thr, pc, fd: epfd);
2015	}
2016	int res = REAL(epoll_ctl)(epfd, op, fd, ev);
2017	return res;
2018	}
2019
2020	TSAN_INTERCEPTOR(int, epoll_wait, int epfd, void *ev, int cnt, int timeout) {
2021	SCOPED_TSAN_INTERCEPTOR(epoll_wait, epfd, ev, cnt, timeout);
2022	if (epfd >= 0)
2023	FdAccess(thr, pc, fd: epfd);
2024	int res = BLOCK_REAL(epoll_wait)(epfd, ev, cnt, timeout);
2025	if (res > 0 && epfd >= 0)
2026	FdAcquire(thr, pc, fd: epfd);
2027	return res;
2028	}
2029
2030	TSAN_INTERCEPTOR(int, epoll_pwait, int epfd, void *ev, int cnt, int timeout,
2031	void *sigmask) {
2032	SCOPED_TSAN_INTERCEPTOR(epoll_pwait, epfd, ev, cnt, timeout, sigmask);
2033	if (epfd >= 0)
2034	FdAccess(thr, pc, fd: epfd);
2035	int res = BLOCK_REAL(epoll_pwait)(epfd, ev, cnt, timeout, sigmask);
2036	if (res > 0 && epfd >= 0)
2037	FdAcquire(thr, pc, fd: epfd);
2038	return res;
2039	}
2040
2041	TSAN_INTERCEPTOR(int, epoll_pwait2, int epfd, void *ev, int cnt, void *timeout,
2042	void *sigmask) {
2043	SCOPED_INTERCEPTOR_RAW(epoll_pwait2, epfd, ev, cnt, timeout, sigmask);
2044	// This function is new and may not be present in libc and/or kernel.
2045	// Since we effectively add it to libc (as will be probed by the program
2046	// using dlsym or a weak function pointer) we need to handle the case
2047	// when it's not present in the actual libc.
2048	if (!REAL(epoll_pwait2)) {
2049	errno = errno_ENOSYS;
2050	return -1;
2051	}
2052	if (MustIgnoreInterceptor(thr))
2053	REAL(epoll_pwait2)(epfd, ev, cnt, timeout, sigmask);
2054	if (epfd >= 0)
2055	FdAccess(thr, pc, fd: epfd);
2056	int res = BLOCK_REAL(epoll_pwait2)(epfd, ev, cnt, timeout, sigmask);
2057	if (res > 0 && epfd >= 0)
2058	FdAcquire(thr, pc, fd: epfd);
2059	return res;
2060	}
2061
2062	# define TSAN_MAYBE_INTERCEPT_EPOLL \
2063	TSAN_INTERCEPT(epoll_create); \
2064	TSAN_INTERCEPT(epoll_create1); \
2065	TSAN_INTERCEPT(epoll_ctl); \
2066	TSAN_INTERCEPT(epoll_wait); \
2067	TSAN_INTERCEPT(epoll_pwait); \
2068	TSAN_INTERCEPT(epoll_pwait2)
2069	#else
2070	#define TSAN_MAYBE_INTERCEPT_EPOLL
2071	#endif
2072
2073	// The following functions are intercepted merely to process pending signals.
2074	// If program blocks signal X, we must deliver the signal before the function
2075	// returns. Similarly, if program unblocks a signal (or returns from sigsuspend)
2076	// it's better to deliver the signal straight away.
2077	TSAN_INTERCEPTOR(int, sigsuspend, const __sanitizer_sigset_t *mask) {
2078	SCOPED_TSAN_INTERCEPTOR(sigsuspend, mask);
2079	return REAL(sigsuspend)(mask);
2080	}
2081
2082	TSAN_INTERCEPTOR(int, sigblock, int mask) {
2083	SCOPED_TSAN_INTERCEPTOR(sigblock, mask);
2084	return REAL(sigblock)(mask);
2085	}
2086
2087	TSAN_INTERCEPTOR(int, sigsetmask, int mask) {
2088	SCOPED_TSAN_INTERCEPTOR(sigsetmask, mask);
2089	return REAL(sigsetmask)(mask);
2090	}
2091
2092	TSAN_INTERCEPTOR(int, pthread_sigmask, int how, const __sanitizer_sigset_t *set,
2093	__sanitizer_sigset_t *oldset) {
2094	SCOPED_TSAN_INTERCEPTOR(pthread_sigmask, how, set, oldset);
2095	return REAL(pthread_sigmask)(how, set, oldset);
2096	}
2097
2098	namespace __tsan {
2099
2100	static void ReportErrnoSpoiling(ThreadState *thr, uptr pc, int sig) {
2101	VarSizeStackTrace stack;
2102	// StackTrace::GetNestInstructionPc(pc) is used because return address is
2103	// expected, OutputReport() will undo this.
2104	ObtainCurrentStack(thr, toppc: StackTrace::GetNextInstructionPc(pc), stack: &stack);
2105	ThreadRegistryLock l(&ctx->thread_registry);
2106	ScopedReport rep(ReportTypeErrnoInSignal);
2107	rep.SetSigNum(sig);
2108	if (!IsFiredSuppression(ctx, type: ReportTypeErrnoInSignal, trace: stack)) {
2109	rep.AddStack(stack, suppressable: true);
2110	OutputReport(thr, srep: rep);
2111	}
2112	}
2113
2114	static void CallUserSignalHandler(ThreadState *thr, bool sync, bool acquire,
2115	int sig, __sanitizer_siginfo *info,
2116	void *uctx) {
2117	CHECK(thr->slot);
2118	__sanitizer_sigaction *sigactions = interceptor_ctx()->sigactions;
2119	if (acquire)
2120	Acquire(thr, pc: 0, addr: (uptr)&sigactions[sig]);
2121	// Signals are generally asynchronous, so if we receive a signals when
2122	// ignores are enabled we should disable ignores. This is critical for sync
2123	// and interceptors, because otherwise we can miss synchronization and report
2124	// false races.
2125	int ignore_reads_and_writes = thr->ignore_reads_and_writes;
2126	int ignore_interceptors = thr->ignore_interceptors;
2127	int ignore_sync = thr->ignore_sync;
2128	// For symbolizer we only process SIGSEGVs synchronously
2129	// (bug in symbolizer or in tsan). But we want to reset
2130	// in_symbolizer to fail gracefully. Symbolizer and user code
2131	// use different memory allocators, so if we don't reset
2132	// in_symbolizer we can get memory allocated with one being
2133	// feed with another, which can cause more crashes.
2134	int in_symbolizer = thr->in_symbolizer;
2135	if (!ctx->after_multithreaded_fork) {
2136	thr->ignore_reads_and_writes = 0;
2137	thr->fast_state.ClearIgnoreBit();
2138	thr->ignore_interceptors = 0;
2139	thr->ignore_sync = 0;
2140	thr->in_symbolizer = 0;
2141	}
2142	// Ensure that the handler does not spoil errno.
2143	const int saved_errno = errno;
2144	errno = 99;
2145	// This code races with sigaction. Be careful to not read sa_sigaction twice.
2146	// Also need to remember pc for reporting before the call,
2147	// because the handler can reset it.
2148	volatile uptr pc = (sigactions[sig].sa_flags & SA_SIGINFO)
2149	? (uptr)sigactions[sig].sigaction
2150	: (uptr)sigactions[sig].handler;
2151	if (pc != sig_dfl && pc != sig_ign) {
2152	// The callback can be either sa_handler or sa_sigaction.
2153	// They have different signatures, but we assume that passing
2154	// additional arguments to sa_handler works and is harmless.
2155	((__sanitizer_sigactionhandler_ptr)pc)(sig, info, uctx);
2156	}
2157	if (!ctx->after_multithreaded_fork) {
2158	thr->ignore_reads_and_writes = ignore_reads_and_writes;
2159	if (ignore_reads_and_writes)
2160	thr->fast_state.SetIgnoreBit();
2161	thr->ignore_interceptors = ignore_interceptors;
2162	thr->ignore_sync = ignore_sync;
2163	thr->in_symbolizer = in_symbolizer;
2164	}
2165	// We do not detect errno spoiling for SIGTERM,
2166	// because some SIGTERM handlers do spoil errno but reraise SIGTERM,
2167	// tsan reports false positive in such case.
2168	// It's difficult to properly detect this situation (reraise),
2169	// because in async signal processing case (when handler is called directly
2170	// from rtl_generic_sighandler) we have not yet received the reraised
2171	// signal; and it looks too fragile to intercept all ways to reraise a signal.
2172	if (ShouldReport(thr, typ: ReportTypeErrnoInSignal) && !sync && sig != SIGTERM &&
2173	errno != 99)
2174	ReportErrnoSpoiling(thr, pc, sig);
2175	errno = saved_errno;
2176	}
2177
2178	void ProcessPendingSignalsImpl(ThreadState *thr) {
2179	atomic_store(a: &thr->pending_signals, v: 0, mo: memory_order_relaxed);
2180	ThreadSignalContext *sctx = SigCtx(thr);
2181	if (sctx == 0)
2182	return;
2183	atomic_fetch_add(a: &thr->in_signal_handler, v: 1, mo: memory_order_relaxed);
2184	internal_sigfillset(set: &sctx->emptyset);
2185	__sanitizer_sigset_t *oldset = sctx->oldset.PushBack();
2186	int res = REAL(pthread_sigmask)(SIG_SETMASK, &sctx->emptyset, oldset);
2187	CHECK_EQ(res, 0);
2188	for (int sig = 0; sig < kSigCount; sig++) {
2189	SignalDesc *signal = &sctx->pending_signals[sig];
2190	if (signal->armed) {
2191	signal->armed = false;
2192	CallUserSignalHandler(thr, sync: false, acquire: true, sig, info: &signal->siginfo,
2193	uctx: &signal->ctx);
2194	}
2195	}
2196	res = REAL(pthread_sigmask)(SIG_SETMASK, oldset, 0);
2197	CHECK_EQ(res, 0);
2198	sctx->oldset.PopBack();
2199	atomic_fetch_add(a: &thr->in_signal_handler, v: -1, mo: memory_order_relaxed);
2200	}
2201
2202	} // namespace __tsan
2203
2204	static bool is_sync_signal(ThreadSignalContext *sctx, int sig,
2205	__sanitizer_siginfo *info) {
2206	// If we are sending signal to ourselves, we must process it now.
2207	if (sctx && sig == sctx->int_signal_send)
2208	return true;
2209	#if SANITIZER_HAS_SIGINFO
2210	// POSIX timers can be configured to send any kind of signal; however, it
2211	// doesn't make any sense to consider a timer signal as synchronous!
2212	if (info->si_code == SI_TIMER)
2213	return false;
2214	#endif
2215	return sig == SIGSEGV || sig == SIGBUS || sig == SIGILL || sig == SIGTRAP ||
2216	sig == SIGABRT || sig == SIGFPE || sig == SIGPIPE || sig == SIGSYS;
2217	}
2218
2219	void sighandler(int sig, __sanitizer_siginfo *info, void *ctx) {
2220	ThreadState *thr = cur_thread_init();
2221	ThreadSignalContext *sctx = SigCtx(thr);
2222	if (sig < 0 || sig >= kSigCount) {
2223	VPrintf(1, "ThreadSanitizer: ignoring signal %d\n", sig);
2224	return;
2225	}
2226	// Don't mess with synchronous signals.
2227	const bool sync = is_sync_signal(sctx, sig, info);
2228	if (sync ||
2229	// If we are in blocking function, we can safely process it now
2230	// (but check if we are in a recursive interceptor,
2231	// i.e. pthread_join()->munmap()).
2232	atomic_load(a: &thr->in_blocking_func, mo: memory_order_relaxed)) {
2233	atomic_fetch_add(a: &thr->in_signal_handler, v: 1, mo: memory_order_relaxed);
2234	if (atomic_load(a: &thr->in_blocking_func, mo: memory_order_relaxed)) {
2235	atomic_store(a: &thr->in_blocking_func, v: 0, mo: memory_order_relaxed);
2236	CallUserSignalHandler(thr, sync, acquire: true, sig, info, uctx: ctx);
2237	atomic_store(a: &thr->in_blocking_func, v: 1, mo: memory_order_relaxed);
2238	} else {
2239	// Be very conservative with when we do acquire in this case.
2240	// It's unsafe to do acquire in async handlers, because ThreadState
2241	// can be in inconsistent state.
2242	// SIGSYS looks relatively safe -- it's synchronous and can actually
2243	// need some global state.
2244	bool acq = (sig == SIGSYS);
2245	CallUserSignalHandler(thr, sync, acquire: acq, sig, info, uctx: ctx);
2246	}
2247	atomic_fetch_add(a: &thr->in_signal_handler, v: -1, mo: memory_order_relaxed);
2248	return;
2249	}
2250
2251	if (sctx == 0)
2252	return;
2253	SignalDesc *signal = &sctx->pending_signals[sig];
2254	if (signal->armed == false) {
2255	signal->armed = true;
2256	internal_memcpy(dest: &signal->siginfo, src: info, n: sizeof(*info));
2257	internal_memcpy(dest: &signal->ctx, src: ctx, n: sizeof(signal->ctx));
2258	atomic_store(a: &thr->pending_signals, v: 1, mo: memory_order_relaxed);
2259	}
2260	}
2261
2262	TSAN_INTERCEPTOR(int, raise, int sig) {
2263	SCOPED_TSAN_INTERCEPTOR(raise, sig);
2264	ThreadSignalContext *sctx = SigCtx(thr);
2265	CHECK_NE(sctx, 0);
2266	int prev = sctx->int_signal_send;
2267	sctx->int_signal_send = sig;
2268	int res = REAL(raise)(sig);
2269	CHECK_EQ(sctx->int_signal_send, sig);
2270	sctx->int_signal_send = prev;
2271	return res;
2272	}
2273
2274	TSAN_INTERCEPTOR(int, kill, int pid, int sig) {
2275	SCOPED_TSAN_INTERCEPTOR(kill, pid, sig);
2276	ThreadSignalContext *sctx = SigCtx(thr);
2277	CHECK_NE(sctx, 0);
2278	int prev = sctx->int_signal_send;
2279	if (pid == (int)internal_getpid()) {
2280	sctx->int_signal_send = sig;
2281	}
2282	int res = REAL(kill)(pid, sig);
2283	if (pid == (int)internal_getpid()) {
2284	CHECK_EQ(sctx->int_signal_send, sig);
2285	sctx->int_signal_send = prev;
2286	}
2287	return res;
2288	}
2289
2290	TSAN_INTERCEPTOR(int, pthread_kill, void *tid, int sig) {
2291	SCOPED_TSAN_INTERCEPTOR(pthread_kill, tid, sig);
2292	ThreadSignalContext *sctx = SigCtx(thr);
2293	CHECK_NE(sctx, 0);
2294	int prev = sctx->int_signal_send;
2295	bool self = pthread_equal(t1: tid, t2: pthread_self());
2296	if (self)
2297	sctx->int_signal_send = sig;
2298	int res = REAL(pthread_kill)(tid, sig);
2299	if (self) {
2300	CHECK_EQ(sctx->int_signal_send, sig);
2301	sctx->int_signal_send = prev;
2302	}
2303	return res;
2304	}
2305
2306	TSAN_INTERCEPTOR(int, gettimeofday, void *tv, void *tz) {
2307	SCOPED_TSAN_INTERCEPTOR(gettimeofday, tv, tz);
2308	// It's intercepted merely to process pending signals.
2309	return REAL(gettimeofday)(tv, tz);
2310	}
2311
2312	TSAN_INTERCEPTOR(int, getaddrinfo, void *node, void *service,
2313	void *hints, void *rv) {
2314	SCOPED_TSAN_INTERCEPTOR(getaddrinfo, node, service, hints, rv);
2315	// We miss atomic synchronization in getaddrinfo,
2316	// and can report false race between malloc and free
2317	// inside of getaddrinfo. So ignore memory accesses.
2318	ThreadIgnoreBegin(thr, pc);
2319	int res = REAL(getaddrinfo)(node, service, hints, rv);
2320	ThreadIgnoreEnd(thr);
2321	return res;
2322	}
2323
2324	TSAN_INTERCEPTOR(int, fork, int fake) {
2325	if (in_symbolizer())
2326	return REAL(fork)(fake);
2327	SCOPED_INTERCEPTOR_RAW(fork, fake);
2328	return REAL(fork)(fake);
2329	}
2330
2331	void atfork_prepare() {
2332	if (in_symbolizer())
2333	return;
2334	ThreadState *thr = cur_thread();
2335	const uptr pc = StackTrace::GetCurrentPc();
2336	ForkBefore(thr, pc);
2337	}
2338
2339	void atfork_parent() {
2340	if (in_symbolizer())
2341	return;
2342	ThreadState *thr = cur_thread();
2343	const uptr pc = StackTrace::GetCurrentPc();
2344	ForkParentAfter(thr, pc);
2345	}
2346
2347	void atfork_child() {
2348	if (in_symbolizer())
2349	return;
2350	ThreadState *thr = cur_thread();
2351	const uptr pc = StackTrace::GetCurrentPc();
2352	ForkChildAfter(thr, pc, start_thread: true);
2353	FdOnFork(thr, pc);
2354	}
2355
2356	#if !SANITIZER_IOS
2357	TSAN_INTERCEPTOR(int, vfork, int fake) {
2358	// Some programs (e.g. openjdk) call close for all file descriptors
2359	// in the child process. Under tsan it leads to false positives, because
2360	// address space is shared, so the parent process also thinks that
2361	// the descriptors are closed (while they are actually not).
2362	// This leads to false positives due to missed synchronization.
2363	// Strictly saying this is undefined behavior, because vfork child is not
2364	// allowed to call any functions other than exec/exit. But this is what
2365	// openjdk does, so we want to handle it.
2366	// We could disable interceptors in the child process. But it's not possible
2367	// to simply intercept and wrap vfork, because vfork child is not allowed
2368	// to return from the function that calls vfork, and that's exactly what
2369	// we would do. So this would require some assembly trickery as well.
2370	// Instead we simply turn vfork into fork.
2371	return WRAP(fork)(fake);
2372	}
2373	#endif
2374
2375	#if SANITIZER_LINUX
2376	TSAN_INTERCEPTOR(int, clone, int (*fn)(void *), void *stack, int flags,
2377	void *arg, int *parent_tid, void *tls, pid_t *child_tid) {
2378	SCOPED_INTERCEPTOR_RAW(clone, fn, stack, flags, arg, parent_tid, tls,
2379	child_tid);
2380	struct Arg {
2381	int (*fn)(void *);
2382	void *arg;
2383	};
2384	auto wrapper = +[](void *p) -> int {
2385	auto *thr = cur_thread();
2386	uptr pc = GET_CURRENT_PC();
2387	// Start the background thread for fork, but not for clone.
2388	// For fork we did this always and it's known to work (or user code has
2389	// adopted). But if we do this for the new clone interceptor some code
2390	// (sandbox2) fails. So model we used to do for years and don't start the
2391	// background thread after clone.
2392	ForkChildAfter(thr, pc, start_thread: false);
2393	FdOnFork(thr, pc);
2394	auto *arg = static_cast<Arg *>(p);
2395	return arg->fn(arg->arg);
2396	};
2397	ForkBefore(thr, pc);
2398	Arg arg_wrapper = {.fn: fn, .arg: arg};
2399	int pid = REAL(clone)(wrapper, stack, flags, &arg_wrapper, parent_tid, tls,
2400	child_tid);
2401	ForkParentAfter(thr, pc);
2402	return pid;
2403	}
2404	#endif
2405
2406	#if !SANITIZER_APPLE && !SANITIZER_ANDROID
2407	typedef int (*dl_iterate_phdr_cb_t)(__sanitizer_dl_phdr_info *info, SIZE_T size,
2408	void *data);
2409	struct dl_iterate_phdr_data {
2410	ThreadState *thr;
2411	uptr pc;
2412	dl_iterate_phdr_cb_t cb;
2413	void *data;
2414	};
2415
2416	static bool IsAppNotRodata(uptr addr) {
2417	return IsAppMem(mem: addr) && *MemToShadow(x: addr) != Shadow::kRodata;
2418	}
2419
2420	static int dl_iterate_phdr_cb(__sanitizer_dl_phdr_info *info, SIZE_T size,
2421	void *data) {
2422	dl_iterate_phdr_data *cbdata = (dl_iterate_phdr_data *)data;
2423	// dlopen/dlclose allocate/free dynamic-linker-internal memory, which is later
2424	// accessible in dl_iterate_phdr callback. But we don't see synchronization
2425	// inside of dynamic linker, so we "unpoison" it here in order to not
2426	// produce false reports. Ignoring malloc/free in dlopen/dlclose is not enough
2427	// because some libc functions call __libc_dlopen.
2428	if (info && IsAppNotRodata(addr: (uptr)info->dlpi_name))
2429	MemoryResetRange(thr: cbdata->thr, pc: cbdata->pc, addr: (uptr)info->dlpi_name,
2430	size: internal_strlen(s: info->dlpi_name));
2431	int res = cbdata->cb(info, size, cbdata->data);
2432	// Perform the check one more time in case info->dlpi_name was overwritten
2433	// by user callback.
2434	if (info && IsAppNotRodata(addr: (uptr)info->dlpi_name))
2435	MemoryResetRange(thr: cbdata->thr, pc: cbdata->pc, addr: (uptr)info->dlpi_name,
2436	size: internal_strlen(s: info->dlpi_name));
2437	return res;
2438	}
2439
2440	TSAN_INTERCEPTOR(int, dl_iterate_phdr, dl_iterate_phdr_cb_t cb, void *data) {
2441	SCOPED_TSAN_INTERCEPTOR(dl_iterate_phdr, cb, data);
2442	dl_iterate_phdr_data cbdata;
2443	cbdata.thr = thr;
2444	cbdata.pc = pc;
2445	cbdata.cb = cb;
2446	cbdata.data = data;
2447	int res = REAL(dl_iterate_phdr)(dl_iterate_phdr_cb, &cbdata);
2448	return res;
2449	}
2450	#endif
2451
2452	static int OnExit(ThreadState *thr) {
2453	int status = Finalize(thr);
2454	FlushStreams();
2455	return status;
2456	}
2457
2458	#if !SANITIZER_APPLE
2459	static void HandleRecvmsg(ThreadState *thr, uptr pc,
2460	__sanitizer_msghdr *msg) {
2461	int fds[64];
2462	int cnt = ExtractRecvmsgFDs(msg, fds, ARRAY_SIZE(fds));
2463	for (int i = 0; i < cnt; i++)
2464	FdEventCreate(thr, pc, fd: fds[i]);
2465	}
2466	#endif
2467
2468	#include "sanitizer_common/sanitizer_platform_interceptors.h"
2469	// Causes interceptor recursion (getaddrinfo() and fopen())
2470	#undef SANITIZER_INTERCEPT_GETADDRINFO
2471	// We define our own.
2472	#if SANITIZER_INTERCEPT_TLS_GET_ADDR
2473	#define NEED_TLS_GET_ADDR
2474	#endif
2475	#undef SANITIZER_INTERCEPT_TLS_GET_ADDR
2476	#define SANITIZER_INTERCEPT_TLS_GET_OFFSET 1
2477	#undef SANITIZER_INTERCEPT_PTHREAD_SIGMASK
2478
2479	#define COMMON_INTERCEPT_FUNCTION_VER(name, ver) \
2480	INTERCEPT_FUNCTION_VER(name, ver)
2481	#define COMMON_INTERCEPT_FUNCTION_VER_UNVERSIONED_FALLBACK(name, ver) \
2482	(INTERCEPT_FUNCTION_VER(name, ver) || INTERCEPT_FUNCTION(name))
2483
2484	#define COMMON_INTERCEPTOR_ENTER_NOIGNORE(ctx, func, ...) \
2485	SCOPED_INTERCEPTOR_RAW(func, __VA_ARGS__); \
2486	TsanInterceptorContext _ctx = {thr, pc}; \
2487	ctx = (void *)&_ctx; \
2488	(void)ctx;
2489
2490	#define COMMON_INTERCEPTOR_FILE_OPEN(ctx, file, path) \
2491	if (path) \
2492	Acquire(thr, pc, File2addr(path)); \
2493	if (file) { \
2494	int fd = fileno_unlocked(file); \
2495	if (fd >= 0) FdFileCreate(thr, pc, fd); \
2496	}
2497
2498	#define COMMON_INTERCEPTOR_FILE_CLOSE(ctx, file) \
2499	if (file) { \
2500	int fd = fileno_unlocked(file); \
2501	FdClose(thr, pc, fd); \
2502	}
2503
2504	#define COMMON_INTERCEPTOR_DLOPEN(filename, flag) \
2505	({ \
2506	CheckNoDeepBind(filename, flag); \
2507	ThreadIgnoreBegin(thr, 0); \
2508	void *res = REAL(dlopen)(filename, flag); \
2509	ThreadIgnoreEnd(thr); \
2510	res; \
2511	})
2512
2513	// Ignore interceptors in OnLibraryLoaded()/Unloaded(). These hooks use code
2514	// (ListOfModules::init, MemoryMappingLayout::DumpListOfModules) that make
2515	// intercepted calls, which can cause deadlockes with ReportRace() which also
2516	// uses this code.
2517	#define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, handle) \
2518	({ \
2519	ScopedIgnoreInterceptors ignore_interceptors; \
2520	libignore()->OnLibraryLoaded(filename); \
2521	})
2522
2523	#define COMMON_INTERCEPTOR_LIBRARY_UNLOADED() \
2524	({ \
2525	ScopedIgnoreInterceptors ignore_interceptors; \
2526	libignore()->OnLibraryUnloaded(); \
2527	})
2528
2529	#define COMMON_INTERCEPTOR_ACQUIRE(ctx, u) \
2530	Acquire(((TsanInterceptorContext *) ctx)->thr, pc, u)
2531
2532	#define COMMON_INTERCEPTOR_RELEASE(ctx, u) \
2533	Release(((TsanInterceptorContext *) ctx)->thr, pc, u)
2534
2535	#define COMMON_INTERCEPTOR_DIR_ACQUIRE(ctx, path) \
2536	Acquire(((TsanInterceptorContext *) ctx)->thr, pc, Dir2addr(path))
2537
2538	#define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \
2539	FdAcquire(((TsanInterceptorContext *) ctx)->thr, pc, fd)
2540
2541	#define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \
2542	FdRelease(((TsanInterceptorContext *) ctx)->thr, pc, fd)
2543
2544	#define COMMON_INTERCEPTOR_FD_ACCESS(ctx, fd) \
2545	FdAccess(((TsanInterceptorContext *) ctx)->thr, pc, fd)
2546
2547	#define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd) \
2548	FdSocketAccept(((TsanInterceptorContext *) ctx)->thr, pc, fd, newfd)
2549
2550	#define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) \
2551	ThreadSetName(((TsanInterceptorContext *) ctx)->thr, name)
2552
2553	#define COMMON_INTERCEPTOR_SET_PTHREAD_NAME(ctx, thread, name) \
2554	if (pthread_equal(pthread_self(), reinterpret_cast<void *>(thread))) \
2555	COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name); \
2556	else \
2557	__tsan::ctx->thread_registry.SetThreadNameByUserId(thread, name)
2558
2559	#define COMMON_INTERCEPTOR_BLOCK_REAL(name) BLOCK_REAL(name)
2560
2561	#define COMMON_INTERCEPTOR_ON_EXIT(ctx) \
2562	OnExit(((TsanInterceptorContext *) ctx)->thr)
2563
2564	#define COMMON_INTERCEPTOR_MMAP_IMPL(ctx, mmap, addr, sz, prot, flags, fd, \
2565	off) \
2566	do { \
2567	return mmap_interceptor(thr, pc, REAL(mmap), addr, sz, prot, flags, fd, \
2568	off); \
2569	} while (false)
2570
2571	#define COMMON_INTERCEPTOR_MUNMAP_IMPL(ctx, addr, sz) \
2572	do { \
2573	return munmap_interceptor(thr, pc, REAL(munmap), addr, sz); \
2574	} while (false)
2575
2576	#if !SANITIZER_APPLE
2577	#define COMMON_INTERCEPTOR_HANDLE_RECVMSG(ctx, msg) \
2578	HandleRecvmsg(((TsanInterceptorContext *)ctx)->thr, \
2579	((TsanInterceptorContext *)ctx)->pc, msg)
2580	#endif
2581
2582	#define COMMON_INTERCEPTOR_GET_TLS_RANGE(begin, end) \
2583	if (TsanThread *t = GetCurrentThread()) { \
2584	*begin = t->tls_begin(); \
2585	*end = t->tls_end(); \
2586	} else { \
2587	*begin = *end = 0; \
2588	}
2589
2590	#define COMMON_INTERCEPTOR_USER_CALLBACK_START() \
2591	SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_START()
2592
2593	#define COMMON_INTERCEPTOR_USER_CALLBACK_END() \
2594	SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_END()
2595
2596	#include "sanitizer_common/sanitizer_common_interceptors.inc"
2597
2598	static int sigaction_impl(int sig, const __sanitizer_sigaction *act,
2599	__sanitizer_sigaction *old);
2600	static __sanitizer_sighandler_ptr signal_impl(int sig,
2601	__sanitizer_sighandler_ptr h);
2602
2603	#define SIGNAL_INTERCEPTOR_SIGACTION_IMPL(signo, act, oldact) \
2604	{ return sigaction_impl(signo, act, oldact); }
2605
2606	#define SIGNAL_INTERCEPTOR_SIGNAL_IMPL(func, signo, handler) \
2607	{ return (uptr)signal_impl(signo, (__sanitizer_sighandler_ptr)handler); }
2608
2609	#define SIGNAL_INTERCEPTOR_ENTER() LazyInitialize(cur_thread_init())
2610
2611	#include "sanitizer_common/sanitizer_signal_interceptors.inc"
2612
2613	int sigaction_impl(int sig, const __sanitizer_sigaction *act,
2614	__sanitizer_sigaction *old) {
2615	// Note: if we call REAL(sigaction) directly for any reason without proxying
2616	// the signal handler through sighandler, very bad things will happen.
2617	// The handler will run synchronously and corrupt tsan per-thread state.
2618	SCOPED_INTERCEPTOR_RAW(sigaction, sig, act, old);
2619	if (sig <= 0 || sig >= kSigCount) {
2620	errno = errno_EINVAL;
2621	return -1;
2622	}
2623	__sanitizer_sigaction *sigactions = interceptor_ctx()->sigactions;
2624	__sanitizer_sigaction old_stored;
2625	if (old) internal_memcpy(dest: &old_stored, src: &sigactions[sig], n: sizeof(old_stored));
2626	__sanitizer_sigaction newact;
2627	if (act) {
2628	// Copy act into sigactions[sig].
2629	// Can't use struct copy, because compiler can emit call to memcpy.
2630	// Can't use internal_memcpy, because it copies byte-by-byte,
2631	// and signal handler reads the handler concurrently. It can read
2632	// some bytes from old value and some bytes from new value.
2633	// Use volatile to prevent insertion of memcpy.
2634	sigactions[sig].handler =
2635	*(volatile __sanitizer_sighandler_ptr const *)&act->handler;
2636	sigactions[sig].sa_flags = *(volatile int const *)&act->sa_flags;
2637	internal_memcpy(dest: &sigactions[sig].sa_mask, src: &act->sa_mask,
2638	n: sizeof(sigactions[sig].sa_mask));
2639	#if !SANITIZER_FREEBSD && !SANITIZER_APPLE && !SANITIZER_NETBSD
2640	sigactions[sig].sa_restorer = act->sa_restorer;
2641	#endif
2642	internal_memcpy(dest: &newact, src: act, n: sizeof(newact));
2643	internal_sigfillset(set: &newact.sa_mask);
2644	if ((act->sa_flags & SA_SIGINFO) ||
2645	((uptr)act->handler != sig_ign && (uptr)act->handler != sig_dfl)) {
2646	newact.sa_flags |= SA_SIGINFO;
2647	newact.sigaction = sighandler;
2648	}
2649	ReleaseStore(thr, pc, addr: (uptr)&sigactions[sig]);
2650	act = &newact;
2651	}
2652	int res = REAL(sigaction)(sig, act, old);
2653	if (res == 0 && old && old->sigaction == sighandler)
2654	internal_memcpy(dest: old, src: &old_stored, n: sizeof(*old));
2655	return res;
2656	}
2657
2658	static __sanitizer_sighandler_ptr signal_impl(int sig,
2659	__sanitizer_sighandler_ptr h) {
2660	__sanitizer_sigaction act;
2661	act.handler = h;
2662	internal_memset(s: &act.sa_mask, c: -1, n: sizeof(act.sa_mask));
2663	act.sa_flags = 0;
2664	__sanitizer_sigaction old;
2665	int res = sigaction_symname(signum: sig, act: &act, oldact: &old);
2666	if (res) return (__sanitizer_sighandler_ptr)sig_err;
2667	return old.handler;
2668	}
2669
2670	#define TSAN_SYSCALL() \
2671	ThreadState *thr = cur_thread(); \
2672	if (thr->ignore_interceptors) \
2673	return; \
2674	ScopedSyscall scoped_syscall(thr)
2675
2676	struct ScopedSyscall {
2677	ThreadState *thr;
2678
2679	explicit ScopedSyscall(ThreadState *thr) : thr(thr) { LazyInitialize(thr); }
2680
2681	~ScopedSyscall() {
2682	ProcessPendingSignals(thr);
2683	}
2684	};
2685
2686	#if !SANITIZER_FREEBSD && !SANITIZER_APPLE
2687	static void syscall_access_range(uptr pc, uptr p, uptr s, bool write) {
2688	TSAN_SYSCALL();
2689	MemoryAccessRange(thr, pc, addr: p, size: s, is_write: write);
2690	}
2691
2692	static USED void syscall_acquire(uptr pc, uptr addr) {
2693	TSAN_SYSCALL();
2694	Acquire(thr, pc, addr);
2695	DPrintf("syscall_acquire(0x%zx))\n", addr);
2696	}
2697
2698	static USED void syscall_release(uptr pc, uptr addr) {
2699	TSAN_SYSCALL();
2700	DPrintf("syscall_release(0x%zx)\n", addr);
2701	Release(thr, pc, addr);
2702	}
2703
2704	static void syscall_fd_close(uptr pc, int fd) {
2705	auto *thr = cur_thread();
2706	FdClose(thr, pc, fd);
2707	}
2708
2709	static USED void syscall_fd_acquire(uptr pc, int fd) {
2710	TSAN_SYSCALL();
2711	FdAcquire(thr, pc, fd);
2712	DPrintf("syscall_fd_acquire(%d)\n", fd);
2713	}
2714
2715	static USED void syscall_fd_release(uptr pc, int fd) {
2716	TSAN_SYSCALL();
2717	DPrintf("syscall_fd_release(%d)\n", fd);
2718	FdRelease(thr, pc, fd);
2719	}
2720
2721	static USED void sycall_blocking_start() {
2722	DPrintf("sycall_blocking_start()\n");
2723	ThreadState *thr = cur_thread();
2724	EnterBlockingFunc(thr);
2725	// When we are in a "blocking call", we process signals asynchronously
2726	// (right when they arrive). In this context we do not expect to be
2727	// executing any user/runtime code. The known interceptor sequence when
2728	// this is not true is: pthread_join -> munmap(stack). It's fine
2729	// to ignore munmap in this case -- we handle stack shadow separately.
2730	thr->ignore_interceptors++;
2731	}
2732
2733	static USED void sycall_blocking_end() {
2734	DPrintf("sycall_blocking_end()\n");
2735	ThreadState *thr = cur_thread();
2736	thr->ignore_interceptors--;
2737	atomic_store(a: &thr->in_blocking_func, v: 0, mo: memory_order_relaxed);
2738	}
2739
2740	static void syscall_pre_fork(uptr pc) { ForkBefore(thr: cur_thread(), pc); }
2741
2742	static void syscall_post_fork(uptr pc, int pid) {
2743	ThreadState *thr = cur_thread();
2744	if (pid == 0) {
2745	// child
2746	ForkChildAfter(thr, pc, start_thread: true);
2747	FdOnFork(thr, pc);
2748	} else if (pid > 0) {
2749	// parent
2750	ForkParentAfter(thr, pc);
2751	} else {
2752	// error
2753	ForkParentAfter(thr, pc);
2754	}
2755	}
2756	#endif
2757
2758	#define COMMON_SYSCALL_PRE_READ_RANGE(p, s) \
2759	syscall_access_range(GET_CALLER_PC(), (uptr)(p), (uptr)(s), false)
2760
2761	#define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) \
2762	syscall_access_range(GET_CALLER_PC(), (uptr)(p), (uptr)(s), true)
2763
2764	#define COMMON_SYSCALL_POST_READ_RANGE(p, s) \
2765	do { \
2766	(void)(p); \
2767	(void)(s); \
2768	} while (false)
2769
2770	#define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) \
2771	do { \
2772	(void)(p); \
2773	(void)(s); \
2774	} while (false)
2775
2776	#define COMMON_SYSCALL_ACQUIRE(addr) \
2777	syscall_acquire(GET_CALLER_PC(), (uptr)(addr))
2778
2779	#define COMMON_SYSCALL_RELEASE(addr) \
2780	syscall_release(GET_CALLER_PC(), (uptr)(addr))
2781
2782	#define COMMON_SYSCALL_FD_CLOSE(fd) syscall_fd_close(GET_CALLER_PC(), fd)
2783
2784	#define COMMON_SYSCALL_FD_ACQUIRE(fd) syscall_fd_acquire(GET_CALLER_PC(), fd)
2785
2786	#define COMMON_SYSCALL_FD_RELEASE(fd) syscall_fd_release(GET_CALLER_PC(), fd)
2787
2788	#define COMMON_SYSCALL_PRE_FORK() \
2789	syscall_pre_fork(GET_CALLER_PC())
2790
2791	#define COMMON_SYSCALL_POST_FORK(res) \
2792	syscall_post_fork(GET_CALLER_PC(), res)
2793
2794	#define COMMON_SYSCALL_BLOCKING_START() sycall_blocking_start()
2795	#define COMMON_SYSCALL_BLOCKING_END() sycall_blocking_end()
2796
2797	#include "sanitizer_common/sanitizer_common_syscalls.inc"
2798	#include "sanitizer_common/sanitizer_syscalls_netbsd.inc"
2799
2800	#ifdef NEED_TLS_GET_ADDR
2801
2802	static void handle_tls_addr(void *arg, void *res) {
2803	ThreadState *thr = cur_thread();
2804	if (!thr)
2805	return;
2806	DTLS::DTV *dtv = DTLS_on_tls_get_addr(arg, res, static_tls_begin: thr->tls_addr,
2807	static_tls_end: thr->tls_addr + thr->tls_size);
2808	if (!dtv)
2809	return;
2810	// New DTLS block has been allocated.
2811	MemoryResetRange(thr, pc: 0, addr: dtv->beg, size: dtv->size);
2812	}
2813
2814	#if !SANITIZER_S390
2815	// Define own interceptor instead of sanitizer_common's for three reasons:
2816	// 1. It must not process pending signals.
2817	// Signal handlers may contain MOVDQA instruction (see below).
2818	// 2. It must be as simple as possible to not contain MOVDQA.
2819	// 3. Sanitizer_common version uses COMMON_INTERCEPTOR_INITIALIZE_RANGE which
2820	// is empty for tsan (meant only for msan).
2821	// Note: __tls_get_addr can be called with mis-aligned stack due to:
2822	// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58066
2823	// So the interceptor must work with mis-aligned stack, in particular, does not
2824	// execute MOVDQA with stack addresses.
2825	TSAN_INTERCEPTOR(void *, __tls_get_addr, void *arg) {
2826	void *res = REAL(__tls_get_addr)(arg);
2827	handle_tls_addr(arg, res);
2828	return res;
2829	}
2830	#else // SANITIZER_S390
2831	TSAN_INTERCEPTOR(uptr, __tls_get_addr_internal, void *arg) {
2832	uptr res = __tls_get_offset_wrapper(arg, REAL(__tls_get_offset));
2833	char *tp = static_cast<char *>(__builtin_thread_pointer());
2834	handle_tls_addr(arg, res + tp);
2835	return res;
2836	}
2837	#endif
2838	#endif
2839
2840	#if SANITIZER_NETBSD
2841	TSAN_INTERCEPTOR(void, _lwp_exit) {
2842	SCOPED_TSAN_INTERCEPTOR(_lwp_exit);
2843	DestroyThreadState();
2844	REAL(_lwp_exit)();
2845	}
2846	#define TSAN_MAYBE_INTERCEPT__LWP_EXIT TSAN_INTERCEPT(_lwp_exit)
2847	#else
2848	#define TSAN_MAYBE_INTERCEPT__LWP_EXIT
2849	#endif
2850
2851	#if SANITIZER_FREEBSD
2852	TSAN_INTERCEPTOR(void, thr_exit, tid_t *state) {
2853	SCOPED_TSAN_INTERCEPTOR(thr_exit, state);
2854	DestroyThreadState();
2855	REAL(thr_exit(state));
2856	}
2857	#define TSAN_MAYBE_INTERCEPT_THR_EXIT TSAN_INTERCEPT(thr_exit)
2858	#else
2859	#define TSAN_MAYBE_INTERCEPT_THR_EXIT
2860	#endif
2861
2862	TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, cond_init, void *c, void *a)
2863	TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, cond_destroy, void *c)
2864	TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, cond_signal, void *c)
2865	TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, cond_broadcast, void *c)
2866	TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, cond_wait, void *c, void *m)
2867	TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, mutex_init, void *m, void *a)
2868	TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, mutex_destroy, void *m)
2869	TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, mutex_lock, void *m)
2870	TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, mutex_trylock, void *m)
2871	TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, mutex_unlock, void *m)
2872	TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, rwlock_init, void *l, void *a)
2873	TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, rwlock_destroy, void *l)
2874	TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, rwlock_rdlock, void *l)
2875	TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, rwlock_tryrdlock, void *l)
2876	TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, rwlock_wrlock, void *l)
2877	TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, rwlock_trywrlock, void *l)
2878	TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, rwlock_unlock, void *l)
2879	TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, once, void *o, void (*i)())
2880	TSAN_INTERCEPTOR_FREEBSD_ALIAS(int, sigmask, int f, void *n, void *o)
2881
2882	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_init, void *c, void *a)
2883	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_signal, void *c)
2884	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_broadcast, void *c)
2885	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_wait, void *c, void *m)
2886	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_destroy, void *c)
2887	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, mutex_init, void *m, void *a)
2888	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, mutex_destroy, void *m)
2889	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, mutex_lock, void *m)
2890	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, mutex_trylock, void *m)
2891	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, mutex_unlock, void *m)
2892	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_init, void *m, void *a)
2893	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_destroy, void *m)
2894	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_rdlock, void *m)
2895	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_tryrdlock, void *m)
2896	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_wrlock, void *m)
2897	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_trywrlock, void *m)
2898	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_unlock, void *m)
2899	TSAN_INTERCEPTOR_NETBSD_ALIAS_THR(int, once, void *o, void (*f)())
2900	TSAN_INTERCEPTOR_NETBSD_ALIAS_THR2(int, sigsetmask, sigmask, int a, void *b,
2901	void *c)
2902
2903	namespace __tsan {
2904
2905	static void finalize(void *arg) {
2906	ThreadState *thr = cur_thread();
2907	int status = Finalize(thr);
2908	// Make sure the output is not lost.
2909	FlushStreams();
2910	if (status)
2911	Die();
2912	}
2913
2914	#if !SANITIZER_APPLE && !SANITIZER_ANDROID
2915	static void unreachable() {
2916	Report(format: "FATAL: ThreadSanitizer: unreachable called\n");
2917	Die();
2918	}
2919	#endif
2920
2921	// Define default implementation since interception of libdispatch is optional.
2922	SANITIZER_WEAK_ATTRIBUTE void InitializeLibdispatchInterceptors() {}
2923
2924	void InitializeInterceptors() {
2925	#if !SANITIZER_APPLE
2926	// We need to setup it early, because functions like dlsym() can call it.
2927	REAL(memset) = internal_memset;
2928	REAL(memcpy) = internal_memcpy;
2929	#endif
2930
2931	__interception::DoesNotSupportStaticLinking();
2932
2933	new(interceptor_ctx()) InterceptorContext();
2934
2935	// Interpose __tls_get_addr before the common interposers. This is needed
2936	// because dlsym() may call malloc on failure which could result in other
2937	// interposed functions being called that could eventually make use of TLS.
2938	#ifdef NEED_TLS_GET_ADDR
2939	# if !SANITIZER_S390
2940	TSAN_INTERCEPT(__tls_get_addr);
2941	# else
2942	TSAN_INTERCEPT(__tls_get_addr_internal);
2943	TSAN_INTERCEPT(__tls_get_offset);
2944	# endif
2945	#endif
2946	InitializeCommonInterceptors();
2947	InitializeSignalInterceptors();
2948	InitializeLibdispatchInterceptors();
2949
2950	#if !SANITIZER_APPLE
2951	InitializeSetjmpInterceptors();
2952	#endif
2953
2954	TSAN_INTERCEPT(longjmp_symname);
2955	TSAN_INTERCEPT(siglongjmp_symname);
2956	#if SANITIZER_NETBSD
2957	TSAN_INTERCEPT(_longjmp);
2958	#endif
2959
2960	TSAN_INTERCEPT(malloc);
2961	TSAN_INTERCEPT(__libc_memalign);
2962	TSAN_INTERCEPT(calloc);
2963	TSAN_INTERCEPT(realloc);
2964	TSAN_INTERCEPT(reallocarray);
2965	TSAN_INTERCEPT(free);
2966	TSAN_INTERCEPT(cfree);
2967	TSAN_INTERCEPT(munmap);
2968	TSAN_MAYBE_INTERCEPT_MEMALIGN;
2969	TSAN_INTERCEPT(valloc);
2970	TSAN_MAYBE_INTERCEPT_PVALLOC;
2971	TSAN_INTERCEPT(posix_memalign);
2972
2973	TSAN_INTERCEPT(strcpy);
2974	TSAN_INTERCEPT(strncpy);
2975	TSAN_INTERCEPT(strdup);
2976
2977	TSAN_INTERCEPT(pthread_create);
2978	TSAN_INTERCEPT(pthread_join);
2979	TSAN_INTERCEPT(pthread_detach);
2980	TSAN_INTERCEPT(pthread_exit);
2981	#if SANITIZER_LINUX
2982	TSAN_INTERCEPT(pthread_tryjoin_np);
2983	TSAN_INTERCEPT(pthread_timedjoin_np);
2984	#endif
2985
2986	TSAN_INTERCEPT_VER(pthread_cond_init, PTHREAD_ABI_BASE);
2987	TSAN_INTERCEPT_VER(pthread_cond_signal, PTHREAD_ABI_BASE);
2988	TSAN_INTERCEPT_VER(pthread_cond_broadcast, PTHREAD_ABI_BASE);
2989	TSAN_INTERCEPT_VER(pthread_cond_wait, PTHREAD_ABI_BASE);
2990	TSAN_INTERCEPT_VER(pthread_cond_timedwait, PTHREAD_ABI_BASE);
2991	TSAN_INTERCEPT_VER(pthread_cond_destroy, PTHREAD_ABI_BASE);
2992
2993	TSAN_MAYBE_PTHREAD_COND_CLOCKWAIT;
2994
2995	TSAN_INTERCEPT(pthread_mutex_init);
2996	TSAN_INTERCEPT(pthread_mutex_destroy);
2997	TSAN_INTERCEPT(pthread_mutex_lock);
2998	TSAN_INTERCEPT(pthread_mutex_trylock);
2999	TSAN_INTERCEPT(pthread_mutex_timedlock);
3000	TSAN_INTERCEPT(pthread_mutex_unlock);
3001	#if SANITIZER_LINUX
3002	TSAN_INTERCEPT(pthread_mutex_clocklock);
3003	#endif
3004	#if SANITIZER_GLIBC
3005	# if !__GLIBC_PREREQ(2, 34)
3006	TSAN_INTERCEPT(__pthread_mutex_lock);
3007	TSAN_INTERCEPT(__pthread_mutex_unlock);
3008	# endif
3009	#endif
3010
3011	TSAN_INTERCEPT(pthread_spin_init);
3012	TSAN_INTERCEPT(pthread_spin_destroy);
3013	TSAN_INTERCEPT(pthread_spin_lock);
3014	TSAN_INTERCEPT(pthread_spin_trylock);
3015	TSAN_INTERCEPT(pthread_spin_unlock);
3016
3017	TSAN_INTERCEPT(pthread_rwlock_init);
3018	TSAN_INTERCEPT(pthread_rwlock_destroy);
3019	TSAN_INTERCEPT(pthread_rwlock_rdlock);
3020	TSAN_INTERCEPT(pthread_rwlock_tryrdlock);
3021	TSAN_INTERCEPT(pthread_rwlock_timedrdlock);
3022	TSAN_INTERCEPT(pthread_rwlock_wrlock);
3023	TSAN_INTERCEPT(pthread_rwlock_trywrlock);
3024	TSAN_INTERCEPT(pthread_rwlock_timedwrlock);
3025	TSAN_INTERCEPT(pthread_rwlock_unlock);
3026
3027	TSAN_INTERCEPT(pthread_barrier_init);
3028	TSAN_INTERCEPT(pthread_barrier_destroy);
3029	TSAN_INTERCEPT(pthread_barrier_wait);
3030
3031	TSAN_INTERCEPT(pthread_once);
3032
3033	TSAN_MAYBE_INTERCEPT___FXSTAT;
3034	TSAN_MAYBE_INTERCEPT_FSTAT;
3035	TSAN_MAYBE_INTERCEPT_FSTAT64;
3036	TSAN_INTERCEPT(open);
3037	TSAN_MAYBE_INTERCEPT_OPEN64;
3038	TSAN_INTERCEPT(creat);
3039	TSAN_MAYBE_INTERCEPT_CREAT64;
3040	TSAN_INTERCEPT(dup);
3041	TSAN_INTERCEPT(dup2);
3042	TSAN_INTERCEPT(dup3);
3043	TSAN_MAYBE_INTERCEPT_EVENTFD;
3044	TSAN_MAYBE_INTERCEPT_SIGNALFD;
3045	TSAN_MAYBE_INTERCEPT_INOTIFY_INIT;
3046	TSAN_MAYBE_INTERCEPT_INOTIFY_INIT1;
3047	TSAN_INTERCEPT(socket);
3048	TSAN_INTERCEPT(socketpair);
3049	TSAN_INTERCEPT(connect);
3050	TSAN_INTERCEPT(bind);
3051	TSAN_INTERCEPT(listen);
3052	TSAN_MAYBE_INTERCEPT_EPOLL;
3053	TSAN_INTERCEPT(close);
3054	TSAN_MAYBE_INTERCEPT___CLOSE;
3055	TSAN_MAYBE_INTERCEPT___RES_ICLOSE;
3056	TSAN_INTERCEPT(pipe);
3057	TSAN_INTERCEPT(pipe2);
3058
3059	TSAN_INTERCEPT(unlink);
3060	TSAN_INTERCEPT(tmpfile);
3061	TSAN_MAYBE_INTERCEPT_TMPFILE64;
3062	TSAN_INTERCEPT(abort);
3063	TSAN_INTERCEPT(rmdir);
3064	TSAN_INTERCEPT(closedir);
3065
3066	TSAN_INTERCEPT(sigsuspend);
3067	TSAN_INTERCEPT(sigblock);
3068	TSAN_INTERCEPT(sigsetmask);
3069	TSAN_INTERCEPT(pthread_sigmask);
3070	TSAN_INTERCEPT(raise);
3071	TSAN_INTERCEPT(kill);
3072	TSAN_INTERCEPT(pthread_kill);
3073	TSAN_INTERCEPT(sleep);
3074	TSAN_INTERCEPT(usleep);
3075	TSAN_INTERCEPT(nanosleep);
3076	TSAN_INTERCEPT(pause);
3077	TSAN_INTERCEPT(gettimeofday);
3078	TSAN_INTERCEPT(getaddrinfo);
3079
3080	TSAN_INTERCEPT(fork);
3081	TSAN_INTERCEPT(vfork);
3082	#if SANITIZER_LINUX
3083	TSAN_INTERCEPT(clone);
3084	#endif
3085	#if !SANITIZER_ANDROID
3086	TSAN_INTERCEPT(dl_iterate_phdr);
3087	#endif
3088
3089	// Symbolization indirectly calls dl_iterate_phdr
3090	ready_to_symbolize = true;
3091
3092	TSAN_MAYBE_INTERCEPT_ON_EXIT;
3093	TSAN_INTERCEPT(__cxa_atexit);
3094	TSAN_INTERCEPT(_exit);
3095
3096	TSAN_MAYBE_INTERCEPT__LWP_EXIT;
3097	TSAN_MAYBE_INTERCEPT_THR_EXIT;
3098
3099	#if !SANITIZER_APPLE && !SANITIZER_ANDROID
3100	// Need to setup it, because interceptors check that the function is resolved.
3101	// But atexit is emitted directly into the module, so can't be resolved.
3102	REAL(atexit) = (int(*)(void(*)()))unreachable;
3103	#endif
3104
3105	if (REAL(__cxa_atexit)(&finalize, 0, 0)) {
3106	Printf(format: "ThreadSanitizer: failed to setup atexit callback\n");
3107	Die();
3108	}
3109	if (pthread_atfork(prepare: atfork_prepare, parent: atfork_parent, child: atfork_child)) {
3110	Printf(format: "ThreadSanitizer: failed to setup atfork callbacks\n");
3111	Die();
3112	}
3113
3114	#if !SANITIZER_APPLE && !SANITIZER_NETBSD && !SANITIZER_FREEBSD
3115	if (pthread_key_create(key: &interceptor_ctx()->finalize_key, destructor: &thread_finalize)) {
3116	Printf(format: "ThreadSanitizer: failed to create thread key\n");
3117	Die();
3118	}
3119	#endif
3120
3121	TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(cond_init);
3122	TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(cond_destroy);
3123	TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(cond_signal);
3124	TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(cond_broadcast);
3125	TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(cond_wait);
3126	TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(mutex_init);
3127	TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(mutex_destroy);
3128	TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(mutex_lock);
3129	TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(mutex_trylock);
3130	TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(mutex_unlock);
3131	TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(rwlock_init);
3132	TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(rwlock_destroy);
3133	TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(rwlock_rdlock);
3134	TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(rwlock_tryrdlock);
3135	TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(rwlock_wrlock);
3136	TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(rwlock_trywrlock);
3137	TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(rwlock_unlock);
3138	TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(once);
3139	TSAN_MAYBE_INTERCEPT_FREEBSD_ALIAS(sigmask);
3140
3141	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(cond_init);
3142	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(cond_signal);
3143	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(cond_broadcast);
3144	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(cond_wait);
3145	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(cond_destroy);
3146	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(mutex_init);
3147	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(mutex_destroy);
3148	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(mutex_lock);
3149	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(mutex_trylock);
3150	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(mutex_unlock);
3151	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_init);
3152	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_destroy);
3153	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_rdlock);
3154	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_tryrdlock);
3155	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_wrlock);
3156	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_trywrlock);
3157	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_unlock);
3158	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS_THR(once);
3159	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS_THR(sigsetmask);
3160
3161	FdInit();
3162	}
3163
3164	} // namespace __tsan
3165
3166	// Invisible barrier for tests.
3167	// There were several unsuccessful iterations for this functionality:
3168	// 1. Initially it was implemented in user code using
3169	// REAL(pthread_barrier_wait). But pthread_barrier_wait is not supported on
3170	// MacOS. Futexes are linux-specific for this matter.
3171	// 2. Then we switched to atomics+usleep(10). But usleep produced parasitic
3172	// "as-if synchronized via sleep" messages in reports which failed some
3173	// output tests.
3174	// 3. Then we switched to atomics+sched_yield. But this produced tons of tsan-
3175	// visible events, which lead to "failed to restore stack trace" failures.
3176	// Note that no_sanitize_thread attribute does not turn off atomic interception
3177	// so attaching it to the function defined in user code does not help.
3178	// That's why we now have what we have.
3179	constexpr u32 kBarrierThreadBits = 10;
3180	constexpr u32 kBarrierThreads = 1 << kBarrierThreadBits;
3181
3182	extern "C" {
3183
3184	SANITIZER_INTERFACE_ATTRIBUTE void __tsan_testonly_barrier_init(
3185	atomic_uint32_t *barrier, u32 num_threads) {
3186	if (num_threads >= kBarrierThreads) {
3187	Printf(format: "barrier_init: count is too large (%d)\n", num_threads);
3188	Die();
3189	}
3190	// kBarrierThreadBits lsb is thread count,
3191	// the remaining are count of entered threads.
3192	atomic_store(a: barrier, v: num_threads, mo: memory_order_relaxed);
3193	}
3194
3195	static u32 barrier_epoch(u32 value) {
3196	return (value >> kBarrierThreadBits) / (value & (kBarrierThreads - 1));
3197	}
3198
3199	SANITIZER_INTERFACE_ATTRIBUTE void __tsan_testonly_barrier_wait(
3200	atomic_uint32_t *barrier) {
3201	u32 old = atomic_fetch_add(a: barrier, v: kBarrierThreads, mo: memory_order_relaxed);
3202	u32 old_epoch = barrier_epoch(value: old);
3203	if (barrier_epoch(value: old + kBarrierThreads) != old_epoch) {
3204	FutexWake(p: barrier, count: (1 << 30));
3205	return;
3206	}
3207	for (;;) {
3208	u32 cur = atomic_load(a: barrier, mo: memory_order_relaxed);
3209	if (barrier_epoch(value: cur) != old_epoch)
3210	return;
3211	FutexWait(p: barrier, cmp: cur);
3212	}
3213	}
3214
3215	} // extern "C"
3216