Bug Summary

File:compiler-rt/lib/tsan/rtl/tsan_rtl.cpp
Warning:line 121, column 21
Storage type is aligned to 1 bytes but allocated type is aligned to 8 bytes

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name tsan_rtl.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=none -fmath-errno -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-feature +sse3 -tune-cpu generic -debugger-tuning=gdb -ffunction-sections -fdata-sections -fcoverage-compilation-dir=/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/build-llvm/projects/compiler-rt/lib/tsan -resource-dir /usr/lib/llvm-13/lib/clang/13.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/build-llvm/projects/compiler-rt/lib/tsan -I /build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/compiler-rt/lib/tsan -I /build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/build-llvm/include -I /build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/llvm/include -I /build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/compiler-rt/lib/tsan/.. -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward -internal-isystem /usr/lib/llvm-13/lib/clang/13.0.0/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O3 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -Wno-unused-parameter -Wno-variadic-macros -std=c++14 -fdeprecated-macro -fdebug-compilation-dir=/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/build-llvm/projects/compiler-rt/lib/tsan -fdebug-prefix-map=/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f=. -ferror-limit 19 -fvisibility hidden -fvisibility-inlines-hidden -fno-builtin -fno-rtti -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2021-04-14-063029-18377-1 -x c++ /build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/compiler-rt/lib/tsan/rtl/tsan_rtl.cpp
1//===-- tsan_rtl.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// Main file (entry points) for the TSan run-time.
12//===----------------------------------------------------------------------===//
13
14#include "tsan_rtl.h"
15
16#include "sanitizer_common/sanitizer_atomic.h"
17#include "sanitizer_common/sanitizer_common.h"
18#include "sanitizer_common/sanitizer_file.h"
19#include "sanitizer_common/sanitizer_libc.h"
20#include "sanitizer_common/sanitizer_placement_new.h"
21#include "sanitizer_common/sanitizer_stackdepot.h"
22#include "sanitizer_common/sanitizer_symbolizer.h"
23#include "tsan_defs.h"
24#include "tsan_interface.h"
25#include "tsan_mman.h"
26#include "tsan_platform.h"
27#include "tsan_suppressions.h"
28#include "tsan_symbolize.h"
29#include "ubsan/ubsan_init.h"
30
31#ifdef __SSE3__1
32// <emmintrin.h> transitively includes <stdlib.h>,
33// and it's prohibited to include std headers into tsan runtime.
34// So we do this dirty trick.
35#define _MM_MALLOC_H_INCLUDED
36#define __MM_MALLOC_H
37#include <emmintrin.h>
38typedef __m128i m128;
39#endif
40
41volatile int __tsan_resumed = 0;
42
43extern "C" void __tsan_resume() {
44 __tsan_resumed = 1;
45}
46
47namespace __tsan {
48
49#if !SANITIZER_GO0 && !SANITIZER_MAC0
50__attribute__((tls_model("initial-exec")))
51THREADLOCAL__thread char cur_thread_placeholder[sizeof(ThreadState)] ALIGNED(64)__attribute__((aligned(64)));
52#endif
53static char ctx_placeholder[sizeof(Context)] ALIGNED(64)__attribute__((aligned(64)));
54Context *ctx;
55
56// Can be overriden by a front-end.
57#ifdef TSAN_EXTERNAL_HOOKS
58bool OnFinalize(bool failed);
59void OnInitialize();
60#else
61#include <dlfcn.h>
62SANITIZER_WEAK_CXX_DEFAULT_IMPLextern "C++" __attribute__((visibility("default"))) __attribute__
((weak)) __attribute__((noinline))
63bool OnFinalize(bool failed) {
64#if !SANITIZER_GO0
65 if (auto *ptr = dlsym(RTLD_DEFAULT((void *) 0), "__tsan_on_finalize"))
66 return reinterpret_cast<decltype(&__tsan_on_finalize)>(ptr)(failed);
67#endif
68 return failed;
69}
70SANITIZER_WEAK_CXX_DEFAULT_IMPLextern "C++" __attribute__((visibility("default"))) __attribute__
((weak)) __attribute__((noinline))
71void OnInitialize() {
72#if !SANITIZER_GO0
73 if (auto *ptr = dlsym(RTLD_DEFAULT((void *) 0), "__tsan_on_initialize")) {
74 return reinterpret_cast<decltype(&__tsan_on_initialize)>(ptr)();
75 }
76#endif
77}
78#endif
79
80static char thread_registry_placeholder[sizeof(ThreadRegistry)];
81
82static ThreadContextBase *CreateThreadContext(u32 tid) {
83 // Map thread trace when context is created.
84 char name[50];
85 internal_snprintf(name, sizeof(name), "trace %u", tid);
86 MapThreadTrace(GetThreadTrace(tid), TraceSize() * sizeof(Event), name);
87 const uptr hdr = GetThreadTraceHeader(tid);
88 internal_snprintf(name, sizeof(name), "trace header %u", tid);
89 MapThreadTrace(hdr, sizeof(Trace), name);
90 new((void*)hdr) Trace();
91 // We are going to use only a small part of the trace with the default
92 // value of history_size. However, the constructor writes to the whole trace.
93 // Release the unused part.
94 uptr hdr_end = hdr + sizeof(Trace);
95 hdr_end -= sizeof(TraceHeader) * (kTraceParts - TraceParts());
96 hdr_end = RoundUp(hdr_end, GetPageSizeCached());
97 if (hdr_end < hdr + sizeof(Trace)) {
98 ReleaseMemoryPagesToOS(hdr_end, hdr + sizeof(Trace));
99 uptr unused = hdr + sizeof(Trace) - hdr_end;
100 if (hdr_end != (uptr)MmapFixedNoAccess(hdr_end, unused)) {
101 Report("ThreadSanitizer: failed to mprotect(%p, %p)\n",
102 hdr_end, unused);
103 CHECK("unable to mprotect" && 0)do { __sanitizer::u64 v1 = (__sanitizer::u64)(("unable to mprotect"
&& 0)); __sanitizer::u64 v2 = (__sanitizer::u64)(0);
if (__builtin_expect(!!(!(v1 != v2)), 0)) __sanitizer::CheckFailed
("/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/compiler-rt/lib/tsan/rtl/tsan_rtl.cpp"
, 103, "(" "(\"unable to mprotect\" && 0)" ") " "!=" " ("
"0" ")", v1, v2); } while (false)
;
104 }
105 }
106 void *mem = internal_alloc(MBlockThreadContex, sizeof(ThreadContext));
107 return new(mem) ThreadContext(tid);
108}
109
110#if !SANITIZER_GO0
111static const u32 kThreadQuarantineSize = 16;
112#else
113static const u32 kThreadQuarantineSize = 64;
114#endif
115
116Context::Context()
117 : initialized()
118 , report_mtx(MutexTypeReport, StatMtxReport)
119 , nreported()
120 , nmissed_expected()
121 , thread_registry(new(thread_registry_placeholder) ThreadRegistry(
3
Storage type is aligned to 1 bytes but allocated type is aligned to 8 bytes
122 CreateThreadContext, kMaxTid, kThreadQuarantineSize, kMaxTidReuse))
123 , racy_mtx(MutexTypeRacy, StatMtxRacy)
124 , racy_stacks()
125 , racy_addresses()
126 , fired_suppressions_mtx(MutexTypeFired, StatMtxFired)
127 , clock_alloc("clock allocator") {
128 fired_suppressions.reserve(8);
129}
130
131// The objects are allocated in TLS, so one may rely on zero-initialization.
132ThreadState::ThreadState(Context *ctx, int tid, int unique_id, u64 epoch,
133 unsigned reuse_count,
134 uptr stk_addr, uptr stk_size,
135 uptr tls_addr, uptr tls_size)
136 : fast_state(tid, epoch)
137 // Do not touch these, rely on zero initialization,
138 // they may be accessed before the ctor.
139 // , ignore_reads_and_writes()
140 // , ignore_interceptors()
141 , clock(tid, reuse_count)
142#if !SANITIZER_GO0
143 , jmp_bufs()
144#endif
145 , tid(tid)
146 , unique_id(unique_id)
147 , stk_addr(stk_addr)
148 , stk_size(stk_size)
149 , tls_addr(tls_addr)
150 , tls_size(tls_size)
151#if !SANITIZER_GO0
152 , last_sleep_clock(tid)
153#endif
154{
155}
156
157#if !SANITIZER_GO0
158static void MemoryProfiler(Context *ctx, fd_t fd, int i) {
159 uptr n_threads;
160 uptr n_running_threads;
161 ctx->thread_registry->GetNumberOfThreads(&n_threads, &n_running_threads);
162 InternalMmapVector<char> buf(4096);
163 WriteMemoryProfile(buf.data(), buf.size(), n_threads, n_running_threads);
164 WriteToFile(fd, buf.data(), internal_strlen(buf.data()));
165}
166
167static void *BackgroundThread(void *arg) {
168 // This is a non-initialized non-user thread, nothing to see here.
169 // We don't use ScopedIgnoreInterceptors, because we want ignores to be
170 // enabled even when the thread function exits (e.g. during pthread thread
171 // shutdown code).
172 cur_thread_init();
173 cur_thread()->ignore_interceptors++;
174 const u64 kMs2Ns = 1000 * 1000;
175
176 fd_t mprof_fd = kInvalidFd((fd_t)-1);
177 if (flags()->profile_memory && flags()->profile_memory[0]) {
178 if (internal_strcmp(flags()->profile_memory, "stdout") == 0) {
179 mprof_fd = 1;
180 } else if (internal_strcmp(flags()->profile_memory, "stderr") == 0) {
181 mprof_fd = 2;
182 } else {
183 InternalScopedString filename;
184 filename.append("%s.%d", flags()->profile_memory, (int)internal_getpid());
185 fd_t fd = OpenFile(filename.data(), WrOnly);
186 if (fd == kInvalidFd((fd_t)-1)) {
187 Printf("ThreadSanitizer: failed to open memory profile file '%s'\n",
188 filename.data());
189 } else {
190 mprof_fd = fd;
191 }
192 }
193 }
194
195 u64 last_flush = NanoTime();
196 uptr last_rss = 0;
197 for (int i = 0;
198 atomic_load(&ctx->stop_background_thread, memory_order_relaxed) == 0;
199 i++) {
200 SleepForMillis(100);
201 u64 now = NanoTime();
202
203 // Flush memory if requested.
204 if (flags()->flush_memory_ms > 0) {
205 if (last_flush + flags()->flush_memory_ms * kMs2Ns < now) {
206 VPrintf(1, "ThreadSanitizer: periodic memory flush\n")do { if ((uptr)Verbosity() >= (1)) Printf("ThreadSanitizer: periodic memory flush\n"
); } while (0)
;
207 FlushShadowMemory();
208 last_flush = NanoTime();
209 }
210 }
211 // GetRSS can be expensive on huge programs, so don't do it every 100ms.
212 if (flags()->memory_limit_mb > 0) {
213 uptr rss = GetRSS();
214 uptr limit = uptr(flags()->memory_limit_mb) << 20;
215 VPrintf(1, "ThreadSanitizer: memory flush check"do { if ((uptr)Verbosity() >= (1)) Printf("ThreadSanitizer: memory flush check"
" RSS=%llu LAST=%llu LIMIT=%llu\n", (u64)rss >> 20, (u64
)last_rss >> 20, (u64)limit >> 20); } while (0)
216 " RSS=%llu LAST=%llu LIMIT=%llu\n",do { if ((uptr)Verbosity() >= (1)) Printf("ThreadSanitizer: memory flush check"
" RSS=%llu LAST=%llu LIMIT=%llu\n", (u64)rss >> 20, (u64
)last_rss >> 20, (u64)limit >> 20); } while (0)
217 (u64)rss >> 20, (u64)last_rss >> 20, (u64)limit >> 20)do { if ((uptr)Verbosity() >= (1)) Printf("ThreadSanitizer: memory flush check"
" RSS=%llu LAST=%llu LIMIT=%llu\n", (u64)rss >> 20, (u64
)last_rss >> 20, (u64)limit >> 20); } while (0)
;
218 if (2 * rss > limit + last_rss) {
219 VPrintf(1, "ThreadSanitizer: flushing memory due to RSS\n")do { if ((uptr)Verbosity() >= (1)) Printf("ThreadSanitizer: flushing memory due to RSS\n"
); } while (0)
;
220 FlushShadowMemory();
221 rss = GetRSS();
222 VPrintf(1, "ThreadSanitizer: memory flushed RSS=%llu\n", (u64)rss>>20)do { if ((uptr)Verbosity() >= (1)) Printf("ThreadSanitizer: memory flushed RSS=%llu\n"
, (u64)rss>>20); } while (0)
;
223 }
224 last_rss = rss;
225 }
226
227 // Write memory profile if requested.
228 if (mprof_fd != kInvalidFd((fd_t)-1))
229 MemoryProfiler(ctx, mprof_fd, i);
230
231 // Flush symbolizer cache if requested.
232 if (flags()->flush_symbolizer_ms > 0) {
233 u64 last = atomic_load(&ctx->last_symbolize_time_ns,
234 memory_order_relaxed);
235 if (last != 0 && last + flags()->flush_symbolizer_ms * kMs2Ns < now) {
236 Lock l(&ctx->report_mtx);
237 ScopedErrorReportLock l2;
238 SymbolizeFlush();
239 atomic_store(&ctx->last_symbolize_time_ns, 0, memory_order_relaxed);
240 }
241 }
242 }
243 return nullptr;
244}
245
246static void StartBackgroundThread() {
247 ctx->background_thread = internal_start_thread(&BackgroundThread, 0);
248}
249
250#ifndef __mips__
251static void StopBackgroundThread() {
252 atomic_store(&ctx->stop_background_thread, 1, memory_order_relaxed);
253 internal_join_thread(ctx->background_thread);
254 ctx->background_thread = 0;
255}
256#endif
257#endif
258
259void DontNeedShadowFor(uptr addr, uptr size) {
260 ReleaseMemoryPagesToOS(MemToShadow(addr), MemToShadow(addr + size));
261}
262
263#if !SANITIZER_GO0
264void UnmapShadow(ThreadState *thr, uptr addr, uptr size) {
265 if (size == 0) return;
266 DontNeedShadowFor(addr, size);
267 ScopedGlobalProcessor sgp;
268 ctx->metamap.ResetRange(thr->proc(), addr, size);
269}
270#endif
271
272void MapShadow(uptr addr, uptr size) {
273 // Global data is not 64K aligned, but there are no adjacent mappings,
274 // so we can get away with unaligned mapping.
275 // CHECK_EQ(addr, addr & ~((64 << 10) - 1)); // windows wants 64K alignment
276 const uptr kPageSize = GetPageSizeCached();
277 uptr shadow_begin = RoundDownTo((uptr)MemToShadow(addr), kPageSize);
278 uptr shadow_end = RoundUpTo((uptr)MemToShadow(addr + size), kPageSize);
279 if (!MmapFixedSuperNoReserve(shadow_begin, shadow_end - shadow_begin,
280 "shadow"))
281 Die();
282
283 // Meta shadow is 2:1, so tread carefully.
284 static bool data_mapped = false;
285 static uptr mapped_meta_end = 0;
286 uptr meta_begin = (uptr)MemToMeta(addr);
287 uptr meta_end = (uptr)MemToMeta(addr + size);
288 meta_begin = RoundDownTo(meta_begin, 64 << 10);
289 meta_end = RoundUpTo(meta_end, 64 << 10);
290 if (!data_mapped) {
291 // First call maps data+bss.
292 data_mapped = true;
293 if (!MmapFixedSuperNoReserve(meta_begin, meta_end - meta_begin,
294 "meta shadow"))
295 Die();
296 } else {
297 // Mapping continous heap.
298 // Windows wants 64K alignment.
299 meta_begin = RoundDownTo(meta_begin, 64 << 10);
300 meta_end = RoundUpTo(meta_end, 64 << 10);
301 if (meta_end <= mapped_meta_end)
302 return;
303 if (meta_begin < mapped_meta_end)
304 meta_begin = mapped_meta_end;
305 if (!MmapFixedSuperNoReserve(meta_begin, meta_end - meta_begin,
306 "meta shadow"))
307 Die();
308 mapped_meta_end = meta_end;
309 }
310 VPrintf(2, "mapped meta shadow for (%p-%p) at (%p-%p)\n",do { if ((uptr)Verbosity() >= (2)) Printf("mapped meta shadow for (%p-%p) at (%p-%p)\n"
, addr, addr+size, meta_begin, meta_end); } while (0)
311 addr, addr+size, meta_begin, meta_end)do { if ((uptr)Verbosity() >= (2)) Printf("mapped meta shadow for (%p-%p) at (%p-%p)\n"
, addr, addr+size, meta_begin, meta_end); } while (0)
;
312}
313
314void MapThreadTrace(uptr addr, uptr size, const char *name) {
315 DPrintf("#0: Mapping trace at %p-%p(0x%zx)\n", addr, addr + size, size);
316 CHECK_GE(addr, TraceMemBeg())do { __sanitizer::u64 v1 = (__sanitizer::u64)((addr)); __sanitizer
::u64 v2 = (__sanitizer::u64)((TraceMemBeg())); if (__builtin_expect
(!!(!(v1 >= v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/compiler-rt/lib/tsan/rtl/tsan_rtl.cpp"
, 316, "(" "(addr)" ") " ">=" " (" "(TraceMemBeg())" ")", v1
, v2); } while (false)
;
317 CHECK_LE(addr + size, TraceMemEnd())do { __sanitizer::u64 v1 = (__sanitizer::u64)((addr + size));
__sanitizer::u64 v2 = (__sanitizer::u64)((TraceMemEnd())); if
(__builtin_expect(!!(!(v1 <= v2)), 0)) __sanitizer::CheckFailed
("/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/compiler-rt/lib/tsan/rtl/tsan_rtl.cpp"
, 317, "(" "(addr + size)" ") " "<=" " (" "(TraceMemEnd())"
")", v1, v2); } while (false)
;
318 CHECK_EQ(addr, addr & ~((64 << 10) - 1))do { __sanitizer::u64 v1 = (__sanitizer::u64)((addr)); __sanitizer
::u64 v2 = (__sanitizer::u64)((addr & ~((64 << 10) -
1))); if (__builtin_expect(!!(!(v1 == v2)), 0)) __sanitizer::
CheckFailed("/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/compiler-rt/lib/tsan/rtl/tsan_rtl.cpp"
, 318, "(" "(addr)" ") " "==" " (" "(addr & ~((64 << 10) - 1))"
")", v1, v2); } while (false)
; // windows wants 64K alignment
319 if (!MmapFixedSuperNoReserve(addr, size, name)) {
320 Printf("FATAL: ThreadSanitizer can not mmap thread trace (%p/%p)\n",
321 addr, size);
322 Die();
323 }
324}
325
326static void CheckShadowMapping() {
327 uptr beg, end;
328 for (int i = 0; GetUserRegion(i, &beg, &end); i++) {
329 // Skip cases for empty regions (heap definition for architectures that
330 // do not use 64-bit allocator).
331 if (beg == end)
332 continue;
333 VPrintf(3, "checking shadow region %p-%p\n", beg, end)do { if ((uptr)Verbosity() >= (3)) Printf("checking shadow region %p-%p\n"
, beg, end); } while (0)
;
334 uptr prev = 0;
335 for (uptr p0 = beg; p0 <= end; p0 += (end - beg) / 4) {
336 for (int x = -(int)kShadowCell; x <= (int)kShadowCell; x += kShadowCell) {
337 const uptr p = RoundDown(p0 + x, kShadowCell);
338 if (p < beg || p >= end)
339 continue;
340 const uptr s = MemToShadow(p);
341 const uptr m = (uptr)MemToMeta(p);
342 VPrintf(3, " checking pointer %p: shadow=%p meta=%p\n", p, s, m)do { if ((uptr)Verbosity() >= (3)) Printf(" checking pointer %p: shadow=%p meta=%p\n"
, p, s, m); } while (0)
;
343 CHECK(IsAppMem(p))do { __sanitizer::u64 v1 = (__sanitizer::u64)((IsAppMem(p)));
__sanitizer::u64 v2 = (__sanitizer::u64)(0); if (__builtin_expect
(!!(!(v1 != v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/compiler-rt/lib/tsan/rtl/tsan_rtl.cpp"
, 343, "(" "(IsAppMem(p))" ") " "!=" " (" "0" ")", v1, v2); }
while (false)
;
344 CHECK(IsShadowMem(s))do { __sanitizer::u64 v1 = (__sanitizer::u64)((IsShadowMem(s)
)); __sanitizer::u64 v2 = (__sanitizer::u64)(0); if (__builtin_expect
(!!(!(v1 != v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/compiler-rt/lib/tsan/rtl/tsan_rtl.cpp"
, 344, "(" "(IsShadowMem(s))" ") " "!=" " (" "0" ")", v1, v2)
; } while (false)
;
345 CHECK_EQ(p, ShadowToMem(s))do { __sanitizer::u64 v1 = (__sanitizer::u64)((p)); __sanitizer
::u64 v2 = (__sanitizer::u64)((ShadowToMem(s))); if (__builtin_expect
(!!(!(v1 == v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/compiler-rt/lib/tsan/rtl/tsan_rtl.cpp"
, 345, "(" "(p)" ") " "==" " (" "(ShadowToMem(s))" ")", v1, v2
); } while (false)
;
346 CHECK(IsMetaMem(m))do { __sanitizer::u64 v1 = (__sanitizer::u64)((IsMetaMem(m)))
; __sanitizer::u64 v2 = (__sanitizer::u64)(0); if (__builtin_expect
(!!(!(v1 != v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/compiler-rt/lib/tsan/rtl/tsan_rtl.cpp"
, 346, "(" "(IsMetaMem(m))" ") " "!=" " (" "0" ")", v1, v2); }
while (false)
;
347 if (prev) {
348 // Ensure that shadow and meta mappings are linear within a single
349 // user range. Lots of code that processes memory ranges assumes it.
350 const uptr prev_s = MemToShadow(prev);
351 const uptr prev_m = (uptr)MemToMeta(prev);
352 CHECK_EQ(s - prev_s, (p - prev) * kShadowMultiplier)do { __sanitizer::u64 v1 = (__sanitizer::u64)((s - prev_s)); __sanitizer
::u64 v2 = (__sanitizer::u64)(((p - prev) * kShadowMultiplier
)); if (__builtin_expect(!!(!(v1 == v2)), 0)) __sanitizer::CheckFailed
("/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/compiler-rt/lib/tsan/rtl/tsan_rtl.cpp"
, 352, "(" "(s - prev_s)" ") " "==" " (" "((p - prev) * kShadowMultiplier)"
")", v1, v2); } while (false)
;
353 CHECK_EQ((m - prev_m) / kMetaShadowSize,do { __sanitizer::u64 v1 = (__sanitizer::u64)(((m - prev_m) /
kMetaShadowSize)); __sanitizer::u64 v2 = (__sanitizer::u64)(
((p - prev) / kMetaShadowCell)); if (__builtin_expect(!!(!(v1
== v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/compiler-rt/lib/tsan/rtl/tsan_rtl.cpp"
, 354, "(" "((m - prev_m) / kMetaShadowSize)" ") " "==" " (" "((p - prev) / kMetaShadowCell)"
")", v1, v2); } while (false)
354 (p - prev) / kMetaShadowCell)do { __sanitizer::u64 v1 = (__sanitizer::u64)(((m - prev_m) /
kMetaShadowSize)); __sanitizer::u64 v2 = (__sanitizer::u64)(
((p - prev) / kMetaShadowCell)); if (__builtin_expect(!!(!(v1
== v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/compiler-rt/lib/tsan/rtl/tsan_rtl.cpp"
, 354, "(" "((m - prev_m) / kMetaShadowSize)" ") " "==" " (" "((p - prev) / kMetaShadowCell)"
")", v1, v2); } while (false)
;
355 }
356 prev = p;
357 }
358 }
359 }
360}
361
362#if !SANITIZER_GO0
363static void OnStackUnwind(const SignalContext &sig, const void *,
364 BufferedStackTrace *stack) {
365 stack->Unwind(StackTrace::GetNextInstructionPc(sig.pc), sig.bp, sig.context,
366 common_flags()->fast_unwind_on_fatal);
367}
368
369static void TsanOnDeadlySignal(int signo, void *siginfo, void *context) {
370 HandleDeadlySignal(siginfo, context, GetTid(), &OnStackUnwind, nullptr);
371}
372#endif
373
374void Initialize(ThreadState *thr) {
375 // Thread safe because done before all threads exist.
376 static bool is_initialized = false;
377 if (is_initialized
0.1
'is_initialized' is false
)
1
Taking false branch
378 return;
379 is_initialized = true;
380 // We are not ready to handle interceptors yet.
381 ScopedIgnoreInterceptors ignore;
382 SanitizerToolName = "ThreadSanitizer";
383 // Install tool-specific callbacks in sanitizer_common.
384 SetCheckFailedCallback(TsanCheckFailed);
385
386 ctx = new(ctx_placeholder) Context;
2
Calling default constructor for 'Context'
387 const char *env_name = SANITIZER_GO0 ? "GORACE" : "TSAN_OPTIONS";
388 const char *options = GetEnv(env_name);
389 CacheBinaryName();
390 CheckASLR();
391 InitializeFlags(&ctx->flags, options, env_name);
392 AvoidCVE_2016_2143();
393 __sanitizer::InitializePlatformEarly();
394 __tsan::InitializePlatformEarly();
395
396#if !SANITIZER_GO0
397 // Re-exec ourselves if we need to set additional env or command line args.
398 MaybeReexec();
399
400 InitializeAllocator();
401 ReplaceSystemMalloc();
402#endif
403 if (common_flags()->detect_deadlocks)
404 ctx->dd = DDetector::Create(flags());
405 Processor *proc = ProcCreate();
406 ProcWire(proc, thr);
407 InitializeInterceptors();
408 CheckShadowMapping();
409 InitializePlatform();
410 InitializeMutex();
411 InitializeDynamicAnnotations();
412#if !SANITIZER_GO0
413 InitializeShadowMemory();
414 InitializeAllocatorLate();
415 InstallDeadlySignalHandlers(TsanOnDeadlySignal);
416#endif
417 // Setup correct file descriptor for error reports.
418 __sanitizer_set_report_path(common_flags()->log_path);
419 InitializeSuppressions();
420#if !SANITIZER_GO0
421 InitializeLibIgnore();
422 Symbolizer::GetOrInit()->AddHooks(EnterSymbolizer, ExitSymbolizer);
423#endif
424
425 VPrintf(1, "***** Running under ThreadSanitizer v2 (pid %d) *****\n",do { if ((uptr)Verbosity() >= (1)) Printf("***** Running under ThreadSanitizer v2 (pid %d) *****\n"
, (int)internal_getpid()); } while (0)
426 (int)internal_getpid())do { if ((uptr)Verbosity() >= (1)) Printf("***** Running under ThreadSanitizer v2 (pid %d) *****\n"
, (int)internal_getpid()); } while (0)
;
427
428 // Initialize thread 0.
429 int tid = ThreadCreate(thr, 0, 0, true);
430 CHECK_EQ(tid, 0)do { __sanitizer::u64 v1 = (__sanitizer::u64)((tid)); __sanitizer
::u64 v2 = (__sanitizer::u64)((0)); if (__builtin_expect(!!(!
(v1 == v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/compiler-rt/lib/tsan/rtl/tsan_rtl.cpp"
, 430, "(" "(tid)" ") " "==" " (" "(0)" ")", v1, v2); } while
(false)
;
431 ThreadStart(thr, tid, GetTid(), ThreadType::Regular);
432#if TSAN_CONTAINS_UBSAN1
433 __ubsan::InitAsPlugin();
434#endif
435 ctx->initialized = true;
436
437#if !SANITIZER_GO0
438 Symbolizer::LateInitialize();
439#endif
440
441 if (flags()->stop_on_start) {
442 Printf("ThreadSanitizer is suspended at startup (pid %d)."
443 " Call __tsan_resume().\n",
444 (int)internal_getpid());
445 while (__tsan_resumed == 0) {}
446 }
447
448 OnInitialize();
449}
450
451void MaybeSpawnBackgroundThread() {
452 // On MIPS, TSan initialization is run before
453 // __pthread_initialize_minimal_internal() is finished, so we can not spawn
454 // new threads.
455#if !SANITIZER_GO0 && !defined(__mips__)
456 static atomic_uint32_t bg_thread = {};
457 if (atomic_load(&bg_thread, memory_order_relaxed) == 0 &&
458 atomic_exchange(&bg_thread, 1, memory_order_relaxed) == 0) {
459 StartBackgroundThread();
460 SetSandboxingCallback(StopBackgroundThread);
461 }
462#endif
463}
464
465
466int Finalize(ThreadState *thr) {
467 bool failed = false;
468
469 if (common_flags()->print_module_map == 1)
470 DumpProcessMap();
471
472 if (flags()->atexit_sleep_ms > 0 && ThreadCount(thr) > 1)
473 SleepForMillis(flags()->atexit_sleep_ms);
474
475 // Wait for pending reports.
476 ctx->report_mtx.Lock();
477 { ScopedErrorReportLock l; }
478 ctx->report_mtx.Unlock();
479
480#if !SANITIZER_GO0
481 if (Verbosity()) AllocatorPrintStats();
482#endif
483
484 ThreadFinalize(thr);
485
486 if (ctx->nreported) {
487 failed = true;
488#if !SANITIZER_GO0
489 Printf("ThreadSanitizer: reported %d warnings\n", ctx->nreported);
490#else
491 Printf("Found %d data race(s)\n", ctx->nreported);
492#endif
493 }
494
495 if (ctx->nmissed_expected) {
496 failed = true;
497 Printf("ThreadSanitizer: missed %d expected races\n",
498 ctx->nmissed_expected);
499 }
500
501 if (common_flags()->print_suppressions)
502 PrintMatchedSuppressions();
503#if !SANITIZER_GO0
504 if (flags()->print_benign)
505 PrintMatchedBenignRaces();
506#endif
507
508 failed = OnFinalize(failed);
509
510#if TSAN_COLLECT_STATS0
511 StatAggregate(ctx->stat, thr->stat);
512 StatOutput(ctx->stat);
513#endif
514
515 return failed ? common_flags()->exitcode : 0;
516}
517
518#if !SANITIZER_GO0
519void ForkBefore(ThreadState *thr, uptr pc) {
520 ctx->thread_registry->Lock();
521 ctx->report_mtx.Lock();
522 // Ignore memory accesses in the pthread_atfork callbacks.
523 // If any of them triggers a data race we will deadlock
524 // on the report_mtx.
525 // We could ignore interceptors and sync operations as well,
526 // but so far it's unclear if it will do more good or harm.
527 // Unnecessarily ignoring things can lead to false positives later.
528 ThreadIgnoreBegin(thr, pc);
529}
530
531void ForkParentAfter(ThreadState *thr, uptr pc) {
532 ThreadIgnoreEnd(thr, pc); // Begin is in ForkBefore.
533 ctx->report_mtx.Unlock();
534 ctx->thread_registry->Unlock();
535}
536
537void ForkChildAfter(ThreadState *thr, uptr pc) {
538 ThreadIgnoreEnd(thr, pc); // Begin is in ForkBefore.
539 ctx->report_mtx.Unlock();
540 ctx->thread_registry->Unlock();
541
542 uptr nthread = 0;
543 ctx->thread_registry->GetNumberOfThreads(0, 0, &nthread /* alive threads */);
544 VPrintf(1, "ThreadSanitizer: forked new process with pid %d,"do { if ((uptr)Verbosity() >= (1)) Printf("ThreadSanitizer: forked new process with pid %d,"
" parent had %d threads\n", (int)internal_getpid(), (int)nthread
); } while (0)
545 " parent had %d threads\n", (int)internal_getpid(), (int)nthread)do { if ((uptr)Verbosity() >= (1)) Printf("ThreadSanitizer: forked new process with pid %d,"
" parent had %d threads\n", (int)internal_getpid(), (int)nthread
); } while (0)
;
546 if (nthread == 1) {
547 StartBackgroundThread();
548 } else {
549 // We've just forked a multi-threaded process. We cannot reasonably function
550 // after that (some mutexes may be locked before fork). So just enable
551 // ignores for everything in the hope that we will exec soon.
552 ctx->after_multithreaded_fork = true;
553 thr->ignore_interceptors++;
554 ThreadIgnoreBegin(thr, pc);
555 ThreadIgnoreSyncBegin(thr, pc);
556 }
557}
558#endif
559
560#if SANITIZER_GO0
561NOINLINE__attribute__((noinline))
562void GrowShadowStack(ThreadState *thr) {
563 const int sz = thr->shadow_stack_end - thr->shadow_stack;
564 const int newsz = 2 * sz;
565 uptr *newstack = (uptr*)internal_alloc(MBlockShadowStack,
566 newsz * sizeof(uptr));
567 internal_memcpy(newstack, thr->shadow_stack, sz * sizeof(uptr));
568 internal_free(thr->shadow_stack);
569 thr->shadow_stack = newstack;
570 thr->shadow_stack_pos = newstack + sz;
571 thr->shadow_stack_end = newstack + newsz;
572}
573#endif
574
575u32 CurrentStackId(ThreadState *thr, uptr pc) {
576 if (!thr->is_inited) // May happen during bootstrap.
577 return 0;
578 if (pc != 0) {
579#if !SANITIZER_GO0
580 DCHECK_LT(thr->shadow_stack_pos, thr->shadow_stack_end);
581#else
582 if (thr->shadow_stack_pos == thr->shadow_stack_end)
583 GrowShadowStack(thr);
584#endif
585 thr->shadow_stack_pos[0] = pc;
586 thr->shadow_stack_pos++;
587 }
588 u32 id = StackDepotPut(
589 StackTrace(thr->shadow_stack, thr->shadow_stack_pos - thr->shadow_stack));
590 if (pc != 0)
591 thr->shadow_stack_pos--;
592 return id;
593}
594
595void TraceSwitch(ThreadState *thr) {
596#if !SANITIZER_GO0
597 if (ctx->after_multithreaded_fork)
598 return;
599#endif
600 thr->nomalloc++;
601 Trace *thr_trace = ThreadTrace(thr->tid);
602 Lock l(&thr_trace->mtx);
603 unsigned trace = (thr->fast_state.epoch() / kTracePartSize) % TraceParts();
604 TraceHeader *hdr = &thr_trace->headers[trace];
605 hdr->epoch0 = thr->fast_state.epoch();
606 ObtainCurrentStack(thr, 0, &hdr->stack0);
607 hdr->mset0 = thr->mset;
608 thr->nomalloc--;
609}
610
611Trace *ThreadTrace(int tid) {
612 return (Trace*)GetThreadTraceHeader(tid);
613}
614
615uptr TraceTopPC(ThreadState *thr) {
616 Event *events = (Event*)GetThreadTrace(thr->tid);
617 uptr pc = events[thr->fast_state.GetTracePos()];
618 return pc;
619}
620
621uptr TraceSize() {
622 return (uptr)(1ull << (kTracePartSizeBits + flags()->history_size + 1));
623}
624
625uptr TraceParts() {
626 return TraceSize() / kTracePartSize;
627}
628
629#if !SANITIZER_GO0
630extern "C" void __tsan_trace_switch() {
631 TraceSwitch(cur_thread());
632}
633
634extern "C" void __tsan_report_race() {
635 ReportRace(cur_thread());
636}
637#endif
638
639ALWAYS_INLINEinline __attribute__((always_inline))
640Shadow LoadShadow(u64 *p) {
641 u64 raw = atomic_load((atomic_uint64_t*)p, memory_order_relaxed);
642 return Shadow(raw);
643}
644
645ALWAYS_INLINEinline __attribute__((always_inline))
646void StoreShadow(u64 *sp, u64 s) {
647 atomic_store((atomic_uint64_t*)sp, s, memory_order_relaxed);
648}
649
650ALWAYS_INLINEinline __attribute__((always_inline))
651void StoreIfNotYetStored(u64 *sp, u64 *s) {
652 StoreShadow(sp, *s);
653 *s = 0;
654}
655
656ALWAYS_INLINEinline __attribute__((always_inline))
657void HandleRace(ThreadState *thr, u64 *shadow_mem,
658 Shadow cur, Shadow old) {
659 thr->racy_state[0] = cur.raw();
660 thr->racy_state[1] = old.raw();
661 thr->racy_shadow_addr = shadow_mem;
662#if !SANITIZER_GO0
663 HACKY_CALL(__tsan_report_race)__asm__ __volatile__("sub $1024, %%rsp;" ".cfi_adjust_cfa_offset "
"1024" ";" ".hidden " "__tsan_report_race" "_thunk;" "call "
"__tsan_report_race" "_thunk;" "add $1024, %%rsp;" ".cfi_adjust_cfa_offset "
"-1024" ";" ::: "memory", "cc");
;
664#else
665 ReportRace(thr);
666#endif
667}
668
669static inline bool HappensBefore(Shadow old, ThreadState *thr) {
670 return thr->clock.get(old.TidWithIgnore()) >= old.epoch();
671}
672
673ALWAYS_INLINEinline __attribute__((always_inline))
674void MemoryAccessImpl1(ThreadState *thr, uptr addr,
675 int kAccessSizeLog, bool kAccessIsWrite, bool kIsAtomic,
676 u64 *shadow_mem, Shadow cur) {
677 StatInc(thr, StatMop);
678 StatInc(thr, kAccessIsWrite ? StatMopWrite : StatMopRead);
679 StatInc(thr, (StatType)(StatMop1 + kAccessSizeLog));
680
681 // This potentially can live in an MMX/SSE scratch register.
682 // The required intrinsics are:
683 // __m128i _mm_move_epi64(__m128i*);
684 // _mm_storel_epi64(u64*, __m128i);
685 u64 store_word = cur.raw();
686 bool stored = false;
687
688 // scan all the shadow values and dispatch to 4 categories:
689 // same, replace, candidate and race (see comments below).
690 // we consider only 3 cases regarding access sizes:
691 // equal, intersect and not intersect. initially I considered
692 // larger and smaller as well, it allowed to replace some
693 // 'candidates' with 'same' or 'replace', but I think
694 // it's just not worth it (performance- and complexity-wise).
695
696 Shadow old(0);
697
698 // It release mode we manually unroll the loop,
699 // because empirically gcc generates better code this way.
700 // However, we can't afford unrolling in debug mode, because the function
701 // consumes almost 4K of stack. Gtest gives only 4K of stack to death test
702 // threads, which is not enough for the unrolled loop.
703#if SANITIZER_DEBUG0
704 for (int idx = 0; idx < 4; idx++) {
705#include "tsan_update_shadow_word_inl.h"
706 }
707#else
708 int idx = 0;
709#include "tsan_update_shadow_word_inl.h"
710 idx = 1;
711 if (stored) {
712#include "tsan_update_shadow_word_inl.h"
713 } else {
714#include "tsan_update_shadow_word_inl.h"
715 }
716 idx = 2;
717 if (stored) {
718#include "tsan_update_shadow_word_inl.h"
719 } else {
720#include "tsan_update_shadow_word_inl.h"
721 }
722 idx = 3;
723 if (stored) {
724#include "tsan_update_shadow_word_inl.h"
725 } else {
726#include "tsan_update_shadow_word_inl.h"
727 }
728#endif
729
730 // we did not find any races and had already stored
731 // the current access info, so we are done
732 if (LIKELY(stored)__builtin_expect(!!(stored), 1))
733 return;
734 // choose a random candidate slot and replace it
735 StoreShadow(shadow_mem + (cur.epoch() % kShadowCnt), store_word);
736 StatInc(thr, StatShadowReplace);
737 return;
738 RACE:
739 HandleRace(thr, shadow_mem, cur, old);
740 return;
741}
742
743void UnalignedMemoryAccess(ThreadState *thr, uptr pc, uptr addr,
744 int size, bool kAccessIsWrite, bool kIsAtomic) {
745 while (size) {
746 int size1 = 1;
747 int kAccessSizeLog = kSizeLog1;
748 if (size >= 8 && (addr & ~7) == ((addr + 7) & ~7)) {
749 size1 = 8;
750 kAccessSizeLog = kSizeLog8;
751 } else if (size >= 4 && (addr & ~7) == ((addr + 3) & ~7)) {
752 size1 = 4;
753 kAccessSizeLog = kSizeLog4;
754 } else if (size >= 2 && (addr & ~7) == ((addr + 1) & ~7)) {
755 size1 = 2;
756 kAccessSizeLog = kSizeLog2;
757 }
758 MemoryAccess(thr, pc, addr, kAccessSizeLog, kAccessIsWrite, kIsAtomic);
759 addr += size1;
760 size -= size1;
761 }
762}
763
764ALWAYS_INLINEinline __attribute__((always_inline))
765bool ContainsSameAccessSlow(u64 *s, u64 a, u64 sync_epoch, bool is_write) {
766 Shadow cur(a);
767 for (uptr i = 0; i < kShadowCnt; i++) {
768 Shadow old(LoadShadow(&s[i]));
769 if (Shadow::Addr0AndSizeAreEqual(cur, old) &&
770 old.TidWithIgnore() == cur.TidWithIgnore() &&
771 old.epoch() > sync_epoch &&
772 old.IsAtomic() == cur.IsAtomic() &&
773 old.IsRead() <= cur.IsRead())
774 return true;
775 }
776 return false;
777}
778
779#if defined(__SSE3__1)
780#define SHUF(v0, v1, i0, i1, i2, i3)_mm_castps_si128((__m128)__builtin_ia32_shufps((__v4sf)(__m128
)(_mm_castsi128_ps(v0)), (__v4sf)(__m128)(_mm_castsi128_ps(v1
)), (int)((i0)*1 + (i1)*4 + (i2)*16 + (i3)*64)))
_mm_castps_si128(_mm_shuffle_ps( \(__m128)__builtin_ia32_shufps((__v4sf)(__m128)(_mm_castsi128_ps
(v0)), (__v4sf)(__m128)(_mm_castsi128_ps(v1)), (int)((i0)*1 +
(i1)*4 + (i2)*16 + (i3)*64))
781 _mm_castsi128_ps(v0), _mm_castsi128_ps(v1), \(__m128)__builtin_ia32_shufps((__v4sf)(__m128)(_mm_castsi128_ps
(v0)), (__v4sf)(__m128)(_mm_castsi128_ps(v1)), (int)((i0)*1 +
(i1)*4 + (i2)*16 + (i3)*64))
782 (i0)*1 + (i1)*4 + (i2)*16 + (i3)*64)(__m128)__builtin_ia32_shufps((__v4sf)(__m128)(_mm_castsi128_ps
(v0)), (__v4sf)(__m128)(_mm_castsi128_ps(v1)), (int)((i0)*1 +
(i1)*4 + (i2)*16 + (i3)*64))
)
783ALWAYS_INLINEinline __attribute__((always_inline))
784bool ContainsSameAccessFast(u64 *s, u64 a, u64 sync_epoch, bool is_write) {
785 // This is an optimized version of ContainsSameAccessSlow.
786 // load current access into access[0:63]
787 const m128 access = _mm_cvtsi64_si128(a);
788 // duplicate high part of access in addr0:
789 // addr0[0:31] = access[32:63]
790 // addr0[32:63] = access[32:63]
791 // addr0[64:95] = access[32:63]
792 // addr0[96:127] = access[32:63]
793 const m128 addr0 = SHUF(access, access, 1, 1, 1, 1)_mm_castps_si128((__m128)__builtin_ia32_shufps((__v4sf)(__m128
)(_mm_castsi128_ps(access)), (__v4sf)(__m128)(_mm_castsi128_ps
(access)), (int)((1)*1 + (1)*4 + (1)*16 + (1)*64)))
;
794 // load 4 shadow slots
795 const m128 shadow0 = _mm_load_si128((__m128i*)s);
796 const m128 shadow1 = _mm_load_si128((__m128i*)s + 1);
797 // load high parts of 4 shadow slots into addr_vect:
798 // addr_vect[0:31] = shadow0[32:63]
799 // addr_vect[32:63] = shadow0[96:127]
800 // addr_vect[64:95] = shadow1[32:63]
801 // addr_vect[96:127] = shadow1[96:127]
802 m128 addr_vect = SHUF(shadow0, shadow1, 1, 3, 1, 3)_mm_castps_si128((__m128)__builtin_ia32_shufps((__v4sf)(__m128
)(_mm_castsi128_ps(shadow0)), (__v4sf)(__m128)(_mm_castsi128_ps
(shadow1)), (int)((1)*1 + (3)*4 + (1)*16 + (3)*64)))
;
803 if (!is_write) {
804 // set IsRead bit in addr_vect
805 const m128 rw_mask1 = _mm_cvtsi64_si128(1<<15);
806 const m128 rw_mask = SHUF(rw_mask1, rw_mask1, 0, 0, 0, 0)_mm_castps_si128((__m128)__builtin_ia32_shufps((__v4sf)(__m128
)(_mm_castsi128_ps(rw_mask1)), (__v4sf)(__m128)(_mm_castsi128_ps
(rw_mask1)), (int)((0)*1 + (0)*4 + (0)*16 + (0)*64)))
;
807 addr_vect = _mm_or_si128(addr_vect, rw_mask);
808 }
809 // addr0 == addr_vect?
810 const m128 addr_res = _mm_cmpeq_epi32(addr0, addr_vect);
811 // epoch1[0:63] = sync_epoch
812 const m128 epoch1 = _mm_cvtsi64_si128(sync_epoch);
813 // epoch[0:31] = sync_epoch[0:31]
814 // epoch[32:63] = sync_epoch[0:31]
815 // epoch[64:95] = sync_epoch[0:31]
816 // epoch[96:127] = sync_epoch[0:31]
817 const m128 epoch = SHUF(epoch1, epoch1, 0, 0, 0, 0)_mm_castps_si128((__m128)__builtin_ia32_shufps((__v4sf)(__m128
)(_mm_castsi128_ps(epoch1)), (__v4sf)(__m128)(_mm_castsi128_ps
(epoch1)), (int)((0)*1 + (0)*4 + (0)*16 + (0)*64)))
;
818 // load low parts of shadow cell epochs into epoch_vect:
819 // epoch_vect[0:31] = shadow0[0:31]
820 // epoch_vect[32:63] = shadow0[64:95]
821 // epoch_vect[64:95] = shadow1[0:31]
822 // epoch_vect[96:127] = shadow1[64:95]
823 const m128 epoch_vect = SHUF(shadow0, shadow1, 0, 2, 0, 2)_mm_castps_si128((__m128)__builtin_ia32_shufps((__v4sf)(__m128
)(_mm_castsi128_ps(shadow0)), (__v4sf)(__m128)(_mm_castsi128_ps
(shadow1)), (int)((0)*1 + (2)*4 + (0)*16 + (2)*64)))
;
824 // epoch_vect >= sync_epoch?
825 const m128 epoch_res = _mm_cmpgt_epi32(epoch_vect, epoch);
826 // addr_res & epoch_res
827 const m128 res = _mm_and_si128(addr_res, epoch_res);
828 // mask[0] = res[7]
829 // mask[1] = res[15]
830 // ...
831 // mask[15] = res[127]
832 const int mask = _mm_movemask_epi8(res);
833 return mask != 0;
834}
835#endif
836
837ALWAYS_INLINEinline __attribute__((always_inline))
838bool ContainsSameAccess(u64 *s, u64 a, u64 sync_epoch, bool is_write) {
839#if defined(__SSE3__1)
840 bool res = ContainsSameAccessFast(s, a, sync_epoch, is_write);
841 // NOTE: this check can fail if the shadow is concurrently mutated
842 // by other threads. But it still can be useful if you modify
843 // ContainsSameAccessFast and want to ensure that it's not completely broken.
844 // DCHECK_EQ(res, ContainsSameAccessSlow(s, a, sync_epoch, is_write));
845 return res;
846#else
847 return ContainsSameAccessSlow(s, a, sync_epoch, is_write);
848#endif
849}
850
851ALWAYS_INLINEinline __attribute__((always_inline)) USED__attribute__((used))
852void MemoryAccess(ThreadState *thr, uptr pc, uptr addr,
853 int kAccessSizeLog, bool kAccessIsWrite, bool kIsAtomic) {
854 u64 *shadow_mem = (u64*)MemToShadow(addr);
855 DPrintf2("#%d: MemoryAccess: @%p %p size=%d"
856 " is_write=%d shadow_mem=%p {%zx, %zx, %zx, %zx}\n",
857 (int)thr->fast_state.tid(), (void*)pc, (void*)addr,
858 (int)(1 << kAccessSizeLog), kAccessIsWrite, shadow_mem,
859 (uptr)shadow_mem[0], (uptr)shadow_mem[1],
860 (uptr)shadow_mem[2], (uptr)shadow_mem[3]);
861#if SANITIZER_DEBUG0
862 if (!IsAppMem(addr)) {
863 Printf("Access to non app mem %zx\n", addr);
864 DCHECK(IsAppMem(addr));
865 }
866 if (!IsShadowMem((uptr)shadow_mem)) {
867 Printf("Bad shadow addr %p (%zx)\n", shadow_mem, addr);
868 DCHECK(IsShadowMem((uptr)shadow_mem));
869 }
870#endif
871
872 if (!SANITIZER_GO0 && !kAccessIsWrite && *shadow_mem == kShadowRodata) {
873 // Access to .rodata section, no races here.
874 // Measurements show that it can be 10-20% of all memory accesses.
875 StatInc(thr, StatMop);
876 StatInc(thr, kAccessIsWrite ? StatMopWrite : StatMopRead);
877 StatInc(thr, (StatType)(StatMop1 + kAccessSizeLog));
878 StatInc(thr, StatMopRodata);
879 return;
880 }
881
882 FastState fast_state = thr->fast_state;
883 if (UNLIKELY(fast_state.GetIgnoreBit())__builtin_expect(!!(fast_state.GetIgnoreBit()), 0)) {
884 StatInc(thr, StatMop);
885 StatInc(thr, kAccessIsWrite ? StatMopWrite : StatMopRead);
886 StatInc(thr, (StatType)(StatMop1 + kAccessSizeLog));
887 StatInc(thr, StatMopIgnored);
888 return;
889 }
890
891 Shadow cur(fast_state);
892 cur.SetAddr0AndSizeLog(addr & 7, kAccessSizeLog);
893 cur.SetWrite(kAccessIsWrite);
894 cur.SetAtomic(kIsAtomic);
895
896 if (LIKELY(ContainsSameAccess(shadow_mem, cur.raw(),__builtin_expect(!!(ContainsSameAccess(shadow_mem, cur.raw(),
thr->fast_synch_epoch, kAccessIsWrite)), 1)
897 thr->fast_synch_epoch, kAccessIsWrite))__builtin_expect(!!(ContainsSameAccess(shadow_mem, cur.raw(),
thr->fast_synch_epoch, kAccessIsWrite)), 1)
) {
898 StatInc(thr, StatMop);
899 StatInc(thr, kAccessIsWrite ? StatMopWrite : StatMopRead);
900 StatInc(thr, (StatType)(StatMop1 + kAccessSizeLog));
901 StatInc(thr, StatMopSame);
902 return;
903 }
904
905 if (kCollectHistory) {
906 fast_state.IncrementEpoch();
907 thr->fast_state = fast_state;
908 TraceAddEvent(thr, fast_state, EventTypeMop, pc);
909 cur.IncrementEpoch();
910 }
911
912 MemoryAccessImpl1(thr, addr, kAccessSizeLog, kAccessIsWrite, kIsAtomic,
913 shadow_mem, cur);
914}
915
916// Called by MemoryAccessRange in tsan_rtl_thread.cpp
917ALWAYS_INLINEinline __attribute__((always_inline)) USED__attribute__((used))
918void MemoryAccessImpl(ThreadState *thr, uptr addr,
919 int kAccessSizeLog, bool kAccessIsWrite, bool kIsAtomic,
920 u64 *shadow_mem, Shadow cur) {
921 if (LIKELY(ContainsSameAccess(shadow_mem, cur.raw(),__builtin_expect(!!(ContainsSameAccess(shadow_mem, cur.raw(),
thr->fast_synch_epoch, kAccessIsWrite)), 1)
922 thr->fast_synch_epoch, kAccessIsWrite))__builtin_expect(!!(ContainsSameAccess(shadow_mem, cur.raw(),
thr->fast_synch_epoch, kAccessIsWrite)), 1)
) {
923 StatInc(thr, StatMop);
924 StatInc(thr, kAccessIsWrite ? StatMopWrite : StatMopRead);
925 StatInc(thr, (StatType)(StatMop1 + kAccessSizeLog));
926 StatInc(thr, StatMopSame);
927 return;
928 }
929
930 MemoryAccessImpl1(thr, addr, kAccessSizeLog, kAccessIsWrite, kIsAtomic,
931 shadow_mem, cur);
932}
933
934static void MemoryRangeSet(ThreadState *thr, uptr pc, uptr addr, uptr size,
935 u64 val) {
936 (void)thr;
937 (void)pc;
938 if (size == 0)
939 return;
940 // FIXME: fix me.
941 uptr offset = addr % kShadowCell;
942 if (offset) {
943 offset = kShadowCell - offset;
944 if (size <= offset)
945 return;
946 addr += offset;
947 size -= offset;
948 }
949 DCHECK_EQ(addr % 8, 0);
950 // If a user passes some insane arguments (memset(0)),
951 // let it just crash as usual.
952 if (!IsAppMem(addr) || !IsAppMem(addr + size - 1))
953 return;
954 // Don't want to touch lots of shadow memory.
955 // If a program maps 10MB stack, there is no need reset the whole range.
956 size = (size + (kShadowCell - 1)) & ~(kShadowCell - 1);
957 // UnmapOrDie/MmapFixedNoReserve does not work on Windows.
958 if (SANITIZER_WINDOWS0 || size < common_flags()->clear_shadow_mmap_threshold) {
959 u64 *p = (u64*)MemToShadow(addr);
960 CHECK(IsShadowMem((uptr)p))do { __sanitizer::u64 v1 = (__sanitizer::u64)((IsShadowMem((uptr
)p))); __sanitizer::u64 v2 = (__sanitizer::u64)(0); if (__builtin_expect
(!!(!(v1 != v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/compiler-rt/lib/tsan/rtl/tsan_rtl.cpp"
, 960, "(" "(IsShadowMem((uptr)p))" ") " "!=" " (" "0" ")", v1
, v2); } while (false)
;
961 CHECK(IsShadowMem((uptr)(p + size * kShadowCnt / kShadowCell - 1)))do { __sanitizer::u64 v1 = (__sanitizer::u64)((IsShadowMem((uptr
)(p + size * kShadowCnt / kShadowCell - 1)))); __sanitizer::u64
v2 = (__sanitizer::u64)(0); if (__builtin_expect(!!(!(v1 != v2
)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/compiler-rt/lib/tsan/rtl/tsan_rtl.cpp"
, 961, "(" "(IsShadowMem((uptr)(p + size * kShadowCnt / kShadowCell - 1)))"
") " "!=" " (" "0" ")", v1, v2); } while (false)
;
962 // FIXME: may overwrite a part outside the region
963 for (uptr i = 0; i < size / kShadowCell * kShadowCnt;) {
964 p[i++] = val;
965 for (uptr j = 1; j < kShadowCnt; j++)
966 p[i++] = 0;
967 }
968 } else {
969 // The region is big, reset only beginning and end.
970 const uptr kPageSize = GetPageSizeCached();
971 u64 *begin = (u64*)MemToShadow(addr);
972 u64 *end = begin + size / kShadowCell * kShadowCnt;
973 u64 *p = begin;
974 // Set at least first kPageSize/2 to page boundary.
975 while ((p < begin + kPageSize / kShadowSize / 2) || ((uptr)p % kPageSize)) {
976 *p++ = val;
977 for (uptr j = 1; j < kShadowCnt; j++)
978 *p++ = 0;
979 }
980 // Reset middle part.
981 u64 *p1 = p;
982 p = RoundDown(end, kPageSize);
983 UnmapOrDie((void*)p1, (uptr)p - (uptr)p1);
984 if (!MmapFixedSuperNoReserve((uptr)p1, (uptr)p - (uptr)p1))
985 Die();
986 // Set the ending.
987 while (p < end) {
988 *p++ = val;
989 for (uptr j = 1; j < kShadowCnt; j++)
990 *p++ = 0;
991 }
992 }
993}
994
995void MemoryResetRange(ThreadState *thr, uptr pc, uptr addr, uptr size) {
996 MemoryRangeSet(thr, pc, addr, size, 0);
997}
998
999void MemoryRangeFreed(ThreadState *thr, uptr pc, uptr addr, uptr size) {
1000 // Processing more than 1k (4k of shadow) is expensive,
1001 // can cause excessive memory consumption (user does not necessary touch
1002 // the whole range) and most likely unnecessary.
1003 if (size > 1024)
1004 size = 1024;
1005 CHECK_EQ(thr->is_freeing, false)do { __sanitizer::u64 v1 = (__sanitizer::u64)((thr->is_freeing
)); __sanitizer::u64 v2 = (__sanitizer::u64)((false)); if (__builtin_expect
(!!(!(v1 == v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/compiler-rt/lib/tsan/rtl/tsan_rtl.cpp"
, 1005, "(" "(thr->is_freeing)" ") " "==" " (" "(false)" ")"
, v1, v2); } while (false)
;
1006 thr->is_freeing = true;
1007 MemoryAccessRange(thr, pc, addr, size, true);
1008 thr->is_freeing = false;
1009 if (kCollectHistory) {
1010 thr->fast_state.IncrementEpoch();
1011 TraceAddEvent(thr, thr->fast_state, EventTypeMop, pc);
1012 }
1013 Shadow s(thr->fast_state);
1014 s.ClearIgnoreBit();
1015 s.MarkAsFreed();
1016 s.SetWrite(true);
1017 s.SetAddr0AndSizeLog(0, 3);
1018 MemoryRangeSet(thr, pc, addr, size, s.raw());
1019}
1020
1021void MemoryRangeImitateWrite(ThreadState *thr, uptr pc, uptr addr, uptr size) {
1022 if (kCollectHistory) {
1023 thr->fast_state.IncrementEpoch();
1024 TraceAddEvent(thr, thr->fast_state, EventTypeMop, pc);
1025 }
1026 Shadow s(thr->fast_state);
1027 s.ClearIgnoreBit();
1028 s.SetWrite(true);
1029 s.SetAddr0AndSizeLog(0, 3);
1030 MemoryRangeSet(thr, pc, addr, size, s.raw());
1031}
1032
1033void MemoryRangeImitateWriteOrResetRange(ThreadState *thr, uptr pc, uptr addr,
1034 uptr size) {
1035 if (thr->ignore_reads_and_writes == 0)
1036 MemoryRangeImitateWrite(thr, pc, addr, size);
1037 else
1038 MemoryResetRange(thr, pc, addr, size);
1039}
1040
1041ALWAYS_INLINEinline __attribute__((always_inline)) USED__attribute__((used))
1042void FuncEntry(ThreadState *thr, uptr pc) {
1043 StatInc(thr, StatFuncEnter);
1044 DPrintf2("#%d: FuncEntry %p\n", (int)thr->fast_state.tid(), (void*)pc);
1045 if (kCollectHistory) {
1046 thr->fast_state.IncrementEpoch();
1047 TraceAddEvent(thr, thr->fast_state, EventTypeFuncEnter, pc);
1048 }
1049
1050 // Shadow stack maintenance can be replaced with
1051 // stack unwinding during trace switch (which presumably must be faster).
1052 DCHECK_GE(thr->shadow_stack_pos, thr->shadow_stack);
1053#if !SANITIZER_GO0
1054 DCHECK_LT(thr->shadow_stack_pos, thr->shadow_stack_end);
1055#else
1056 if (thr->shadow_stack_pos == thr->shadow_stack_end)
1057 GrowShadowStack(thr);
1058#endif
1059 thr->shadow_stack_pos[0] = pc;
1060 thr->shadow_stack_pos++;
1061}
1062
1063ALWAYS_INLINEinline __attribute__((always_inline)) USED__attribute__((used))
1064void FuncExit(ThreadState *thr) {
1065 StatInc(thr, StatFuncExit);
1066 DPrintf2("#%d: FuncExit\n", (int)thr->fast_state.tid());
1067 if (kCollectHistory) {
1068 thr->fast_state.IncrementEpoch();
1069 TraceAddEvent(thr, thr->fast_state, EventTypeFuncExit, 0);
1070 }
1071
1072 DCHECK_GT(thr->shadow_stack_pos, thr->shadow_stack);
1073#if !SANITIZER_GO0
1074 DCHECK_LT(thr->shadow_stack_pos, thr->shadow_stack_end);
1075#endif
1076 thr->shadow_stack_pos--;
1077}
1078
1079void ThreadIgnoreBegin(ThreadState *thr, uptr pc, bool save_stack) {
1080 DPrintf("#%d: ThreadIgnoreBegin\n", thr->tid);
1081 thr->ignore_reads_and_writes++;
1082 CHECK_GT(thr->ignore_reads_and_writes, 0)do { __sanitizer::u64 v1 = (__sanitizer::u64)((thr->ignore_reads_and_writes
)); __sanitizer::u64 v2 = (__sanitizer::u64)((0)); if (__builtin_expect
(!!(!(v1 > v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/compiler-rt/lib/tsan/rtl/tsan_rtl.cpp"
, 1082, "(" "(thr->ignore_reads_and_writes)" ") " ">" " ("
"(0)" ")", v1, v2); } while (false)
;
1083 thr->fast_state.SetIgnoreBit();
1084#if !SANITIZER_GO0
1085 if (save_stack && !ctx->after_multithreaded_fork)
1086 thr->mop_ignore_set.Add(CurrentStackId(thr, pc));
1087#endif
1088}
1089
1090void ThreadIgnoreEnd(ThreadState *thr, uptr pc) {
1091 DPrintf("#%d: ThreadIgnoreEnd\n", thr->tid);
1092 CHECK_GT(thr->ignore_reads_and_writes, 0)do { __sanitizer::u64 v1 = (__sanitizer::u64)((thr->ignore_reads_and_writes
)); __sanitizer::u64 v2 = (__sanitizer::u64)((0)); if (__builtin_expect
(!!(!(v1 > v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/compiler-rt/lib/tsan/rtl/tsan_rtl.cpp"
, 1092, "(" "(thr->ignore_reads_and_writes)" ") " ">" " ("
"(0)" ")", v1, v2); } while (false)
;
1093 thr->ignore_reads_and_writes--;
1094 if (thr->ignore_reads_and_writes == 0) {
1095 thr->fast_state.ClearIgnoreBit();
1096#if !SANITIZER_GO0
1097 thr->mop_ignore_set.Reset();
1098#endif
1099 }
1100}
1101
1102#if !SANITIZER_GO0
1103extern "C" SANITIZER_INTERFACE_ATTRIBUTE__attribute__((visibility("default")))
1104uptr __tsan_testonly_shadow_stack_current_size() {
1105 ThreadState *thr = cur_thread();
1106 return thr->shadow_stack_pos - thr->shadow_stack;
1107}
1108#endif
1109
1110void ThreadIgnoreSyncBegin(ThreadState *thr, uptr pc, bool save_stack) {
1111 DPrintf("#%d: ThreadIgnoreSyncBegin\n", thr->tid);
1112 thr->ignore_sync++;
1113 CHECK_GT(thr->ignore_sync, 0)do { __sanitizer::u64 v1 = (__sanitizer::u64)((thr->ignore_sync
)); __sanitizer::u64 v2 = (__sanitizer::u64)((0)); if (__builtin_expect
(!!(!(v1 > v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/compiler-rt/lib/tsan/rtl/tsan_rtl.cpp"
, 1113, "(" "(thr->ignore_sync)" ") " ">" " (" "(0)" ")"
, v1, v2); } while (false)
;
1114#if !SANITIZER_GO0
1115 if (save_stack && !ctx->after_multithreaded_fork)
1116 thr->sync_ignore_set.Add(CurrentStackId(thr, pc));
1117#endif
1118}
1119
1120void ThreadIgnoreSyncEnd(ThreadState *thr, uptr pc) {
1121 DPrintf("#%d: ThreadIgnoreSyncEnd\n", thr->tid);
1122 CHECK_GT(thr->ignore_sync, 0)do { __sanitizer::u64 v1 = (__sanitizer::u64)((thr->ignore_sync
)); __sanitizer::u64 v2 = (__sanitizer::u64)((0)); if (__builtin_expect
(!!(!(v1 > v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-13~++20210413100635+64c24f493e5f/compiler-rt/lib/tsan/rtl/tsan_rtl.cpp"
, 1122, "(" "(thr->ignore_sync)" ") " ">" " (" "(0)" ")"
, v1, v2); } while (false)
;
1123 thr->ignore_sync--;
1124#if !SANITIZER_GO0
1125 if (thr->ignore_sync == 0)
1126 thr->sync_ignore_set.Reset();
1127#endif
1128}
1129
1130bool MD5Hash::operator==(const MD5Hash &other) const {
1131 return hash[0] == other.hash[0] && hash[1] == other.hash[1];
1132}
1133
1134#if SANITIZER_DEBUG0
1135void build_consistency_debug() {}
1136#else
1137void build_consistency_release() {}
1138#endif
1139
1140#if TSAN_COLLECT_STATS0
1141void build_consistency_stats() {}
1142#else
1143void build_consistency_nostats() {}
1144#endif
1145
1146} // namespace __tsan
1147
1148#if !SANITIZER_GO0
1149// Must be included in this file to make sure everything is inlined.
1150#include "tsan_interface_inl.h"
1151#endif