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-rw-r--r--lib/msan/msan.cpp675
1 files changed, 675 insertions, 0 deletions
diff --git a/lib/msan/msan.cpp b/lib/msan/msan.cpp
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+++ b/lib/msan/msan.cpp
@@ -0,0 +1,675 @@
+//===-- msan.cpp ----------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of MemorySanitizer.
+//
+// MemorySanitizer runtime.
+//===----------------------------------------------------------------------===//
+
+#include "msan.h"
+#include "msan_chained_origin_depot.h"
+#include "msan_origin.h"
+#include "msan_report.h"
+#include "msan_thread.h"
+#include "msan_poisoning.h"
+#include "sanitizer_common/sanitizer_atomic.h"
+#include "sanitizer_common/sanitizer_common.h"
+#include "sanitizer_common/sanitizer_flags.h"
+#include "sanitizer_common/sanitizer_flag_parser.h"
+#include "sanitizer_common/sanitizer_libc.h"
+#include "sanitizer_common/sanitizer_procmaps.h"
+#include "sanitizer_common/sanitizer_stacktrace.h"
+#include "sanitizer_common/sanitizer_symbolizer.h"
+#include "sanitizer_common/sanitizer_stackdepot.h"
+#include "ubsan/ubsan_flags.h"
+#include "ubsan/ubsan_init.h"
+
+// ACHTUNG! No system header includes in this file.
+
+using namespace __sanitizer;
+
+// Globals.
+static THREADLOCAL int msan_expect_umr = 0;
+static THREADLOCAL int msan_expected_umr_found = 0;
+
+// Function argument shadow. Each argument starts at the next available 8-byte
+// aligned address.
+SANITIZER_INTERFACE_ATTRIBUTE
+THREADLOCAL u64 __msan_param_tls[kMsanParamTlsSize / sizeof(u64)];
+
+// Function argument origin. Each argument starts at the same offset as the
+// corresponding shadow in (__msan_param_tls). Slightly weird, but changing this
+// would break compatibility with older prebuilt binaries.
+SANITIZER_INTERFACE_ATTRIBUTE
+THREADLOCAL u32 __msan_param_origin_tls[kMsanParamTlsSize / sizeof(u32)];
+
+SANITIZER_INTERFACE_ATTRIBUTE
+THREADLOCAL u64 __msan_retval_tls[kMsanRetvalTlsSize / sizeof(u64)];
+
+SANITIZER_INTERFACE_ATTRIBUTE
+THREADLOCAL u32 __msan_retval_origin_tls;
+
+SANITIZER_INTERFACE_ATTRIBUTE
+ALIGNED(16) THREADLOCAL u64 __msan_va_arg_tls[kMsanParamTlsSize / sizeof(u64)];
+
+SANITIZER_INTERFACE_ATTRIBUTE
+ALIGNED(16)
+THREADLOCAL u32 __msan_va_arg_origin_tls[kMsanParamTlsSize / sizeof(u32)];
+
+SANITIZER_INTERFACE_ATTRIBUTE
+THREADLOCAL u64 __msan_va_arg_overflow_size_tls;
+
+SANITIZER_INTERFACE_ATTRIBUTE
+THREADLOCAL u32 __msan_origin_tls;
+
+static THREADLOCAL int is_in_symbolizer;
+
+extern "C" SANITIZER_WEAK_ATTRIBUTE const int __msan_track_origins;
+
+int __msan_get_track_origins() {
+ return &__msan_track_origins ? __msan_track_origins : 0;
+}
+
+extern "C" SANITIZER_WEAK_ATTRIBUTE const int __msan_keep_going;
+
+namespace __msan {
+
+void EnterSymbolizer() { ++is_in_symbolizer; }
+void ExitSymbolizer() { --is_in_symbolizer; }
+bool IsInSymbolizer() { return is_in_symbolizer; }
+
+static Flags msan_flags;
+
+Flags *flags() {
+ return &msan_flags;
+}
+
+int msan_inited = 0;
+bool msan_init_is_running;
+
+int msan_report_count = 0;
+
+// Array of stack origins.
+// FIXME: make it resizable.
+static const uptr kNumStackOriginDescrs = 1024 * 1024;
+static const char *StackOriginDescr[kNumStackOriginDescrs];
+static uptr StackOriginPC[kNumStackOriginDescrs];
+static atomic_uint32_t NumStackOriginDescrs;
+
+void Flags::SetDefaults() {
+#define MSAN_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue;
+#include "msan_flags.inc"
+#undef MSAN_FLAG
+}
+
+// keep_going is an old name for halt_on_error,
+// and it has inverse meaning.
+class FlagHandlerKeepGoing : public FlagHandlerBase {
+ bool *halt_on_error_;
+
+ public:
+ explicit FlagHandlerKeepGoing(bool *halt_on_error)
+ : halt_on_error_(halt_on_error) {}
+ bool Parse(const char *value) final {
+ bool tmp;
+ FlagHandler<bool> h(&tmp);
+ if (!h.Parse(value)) return false;
+ *halt_on_error_ = !tmp;
+ return true;
+ }
+};
+
+static void RegisterMsanFlags(FlagParser *parser, Flags *f) {
+#define MSAN_FLAG(Type, Name, DefaultValue, Description) \
+ RegisterFlag(parser, #Name, Description, &f->Name);
+#include "msan_flags.inc"
+#undef MSAN_FLAG
+
+ FlagHandlerKeepGoing *fh_keep_going =
+ new (FlagParser::Alloc) FlagHandlerKeepGoing(&f->halt_on_error);
+ parser->RegisterHandler("keep_going", fh_keep_going,
+ "deprecated, use halt_on_error");
+}
+
+static void InitializeFlags() {
+ SetCommonFlagsDefaults();
+ {
+ CommonFlags cf;
+ cf.CopyFrom(*common_flags());
+ cf.external_symbolizer_path = GetEnv("MSAN_SYMBOLIZER_PATH");
+ cf.malloc_context_size = 20;
+ cf.handle_ioctl = true;
+ // FIXME: test and enable.
+ cf.check_printf = false;
+ cf.intercept_tls_get_addr = true;
+ cf.exitcode = 77;
+ OverrideCommonFlags(cf);
+ }
+
+ Flags *f = flags();
+ f->SetDefaults();
+
+ FlagParser parser;
+ RegisterMsanFlags(&parser, f);
+ RegisterCommonFlags(&parser);
+
+#if MSAN_CONTAINS_UBSAN
+ __ubsan::Flags *uf = __ubsan::flags();
+ uf->SetDefaults();
+
+ FlagParser ubsan_parser;
+ __ubsan::RegisterUbsanFlags(&ubsan_parser, uf);
+ RegisterCommonFlags(&ubsan_parser);
+#endif
+
+ // Override from user-specified string.
+ if (__msan_default_options)
+ parser.ParseString(__msan_default_options());
+#if MSAN_CONTAINS_UBSAN
+ const char *ubsan_default_options = __ubsan::MaybeCallUbsanDefaultOptions();
+ ubsan_parser.ParseString(ubsan_default_options);
+#endif
+
+ parser.ParseStringFromEnv("MSAN_OPTIONS");
+#if MSAN_CONTAINS_UBSAN
+ ubsan_parser.ParseStringFromEnv("UBSAN_OPTIONS");
+#endif
+
+ InitializeCommonFlags();
+
+ if (Verbosity()) ReportUnrecognizedFlags();
+
+ if (common_flags()->help) parser.PrintFlagDescriptions();
+
+ // Check if deprecated exit_code MSan flag is set.
+ if (f->exit_code != -1) {
+ if (Verbosity())
+ Printf("MSAN_OPTIONS=exit_code is deprecated! "
+ "Please use MSAN_OPTIONS=exitcode instead.\n");
+ CommonFlags cf;
+ cf.CopyFrom(*common_flags());
+ cf.exitcode = f->exit_code;
+ OverrideCommonFlags(cf);
+ }
+
+ // Check flag values:
+ if (f->origin_history_size < 0 ||
+ f->origin_history_size > Origin::kMaxDepth) {
+ Printf(
+ "Origin history size invalid: %d. Must be 0 (unlimited) or in [1, %d] "
+ "range.\n",
+ f->origin_history_size, Origin::kMaxDepth);
+ Die();
+ }
+ // Limiting to kStackDepotMaxUseCount / 2 to avoid overflow in
+ // StackDepotHandle::inc_use_count_unsafe.
+ if (f->origin_history_per_stack_limit < 0 ||
+ f->origin_history_per_stack_limit > kStackDepotMaxUseCount / 2) {
+ Printf(
+ "Origin per-stack limit invalid: %d. Must be 0 (unlimited) or in [1, "
+ "%d] range.\n",
+ f->origin_history_per_stack_limit, kStackDepotMaxUseCount / 2);
+ Die();
+ }
+ if (f->store_context_size < 1) f->store_context_size = 1;
+}
+
+void PrintWarning(uptr pc, uptr bp) {
+ PrintWarningWithOrigin(pc, bp, __msan_origin_tls);
+}
+
+void PrintWarningWithOrigin(uptr pc, uptr bp, u32 origin) {
+ if (msan_expect_umr) {
+ // Printf("Expected UMR\n");
+ __msan_origin_tls = origin;
+ msan_expected_umr_found = 1;
+ return;
+ }
+
+ ++msan_report_count;
+
+ GET_FATAL_STACK_TRACE_PC_BP(pc, bp);
+
+ u32 report_origin =
+ (__msan_get_track_origins() && Origin::isValidId(origin)) ? origin : 0;
+ ReportUMR(&stack, report_origin);
+
+ if (__msan_get_track_origins() && !Origin::isValidId(origin)) {
+ Printf(
+ " ORIGIN: invalid (%x). Might be a bug in MemorySanitizer origin "
+ "tracking.\n This could still be a bug in your code, too!\n",
+ origin);
+ }
+}
+
+void UnpoisonParam(uptr n) {
+ internal_memset(__msan_param_tls, 0, n * sizeof(*__msan_param_tls));
+}
+
+// Backup MSan runtime TLS state.
+// Implementation must be async-signal-safe.
+// Instances of this class may live on the signal handler stack, and data size
+// may be an issue.
+void ScopedThreadLocalStateBackup::Backup() {
+ va_arg_overflow_size_tls = __msan_va_arg_overflow_size_tls;
+}
+
+void ScopedThreadLocalStateBackup::Restore() {
+ // A lame implementation that only keeps essential state and resets the rest.
+ __msan_va_arg_overflow_size_tls = va_arg_overflow_size_tls;
+
+ internal_memset(__msan_param_tls, 0, sizeof(__msan_param_tls));
+ internal_memset(__msan_retval_tls, 0, sizeof(__msan_retval_tls));
+ internal_memset(__msan_va_arg_tls, 0, sizeof(__msan_va_arg_tls));
+ internal_memset(__msan_va_arg_origin_tls, 0,
+ sizeof(__msan_va_arg_origin_tls));
+
+ if (__msan_get_track_origins()) {
+ internal_memset(&__msan_retval_origin_tls, 0,
+ sizeof(__msan_retval_origin_tls));
+ internal_memset(__msan_param_origin_tls, 0,
+ sizeof(__msan_param_origin_tls));
+ }
+}
+
+void UnpoisonThreadLocalState() {
+}
+
+const char *GetStackOriginDescr(u32 id, uptr *pc) {
+ CHECK_LT(id, kNumStackOriginDescrs);
+ if (pc) *pc = StackOriginPC[id];
+ return StackOriginDescr[id];
+}
+
+u32 ChainOrigin(u32 id, StackTrace *stack) {
+ MsanThread *t = GetCurrentThread();
+ if (t && t->InSignalHandler())
+ return id;
+
+ Origin o = Origin::FromRawId(id);
+ stack->tag = StackTrace::TAG_UNKNOWN;
+ Origin chained = Origin::CreateChainedOrigin(o, stack);
+ return chained.raw_id();
+}
+
+} // namespace __msan
+
+void __sanitizer::BufferedStackTrace::UnwindImpl(
+ uptr pc, uptr bp, void *context, bool request_fast, u32 max_depth) {
+ using namespace __msan;
+ MsanThread *t = GetCurrentThread();
+ if (!t || !StackTrace::WillUseFastUnwind(request_fast)) {
+ // Block reports from our interceptors during _Unwind_Backtrace.
+ SymbolizerScope sym_scope;
+ return Unwind(max_depth, pc, bp, context, 0, 0, false);
+ }
+ if (StackTrace::WillUseFastUnwind(request_fast))
+ Unwind(max_depth, pc, bp, nullptr, t->stack_top(), t->stack_bottom(), true);
+ else
+ Unwind(max_depth, pc, 0, context, 0, 0, false);
+}
+
+// Interface.
+
+using namespace __msan;
+
+#define MSAN_MAYBE_WARNING(type, size) \
+ void __msan_maybe_warning_##size(type s, u32 o) { \
+ GET_CALLER_PC_BP_SP; \
+ (void) sp; \
+ if (UNLIKELY(s)) { \
+ PrintWarningWithOrigin(pc, bp, o); \
+ if (__msan::flags()->halt_on_error) { \
+ Printf("Exiting\n"); \
+ Die(); \
+ } \
+ } \
+ }
+
+MSAN_MAYBE_WARNING(u8, 1)
+MSAN_MAYBE_WARNING(u16, 2)
+MSAN_MAYBE_WARNING(u32, 4)
+MSAN_MAYBE_WARNING(u64, 8)
+
+#define MSAN_MAYBE_STORE_ORIGIN(type, size) \
+ void __msan_maybe_store_origin_##size(type s, void *p, u32 o) { \
+ if (UNLIKELY(s)) { \
+ if (__msan_get_track_origins() > 1) { \
+ GET_CALLER_PC_BP_SP; \
+ (void) sp; \
+ GET_STORE_STACK_TRACE_PC_BP(pc, bp); \
+ o = ChainOrigin(o, &stack); \
+ } \
+ *(u32 *)MEM_TO_ORIGIN((uptr)p & ~3UL) = o; \
+ } \
+ }
+
+MSAN_MAYBE_STORE_ORIGIN(u8, 1)
+MSAN_MAYBE_STORE_ORIGIN(u16, 2)
+MSAN_MAYBE_STORE_ORIGIN(u32, 4)
+MSAN_MAYBE_STORE_ORIGIN(u64, 8)
+
+void __msan_warning() {
+ GET_CALLER_PC_BP_SP;
+ (void)sp;
+ PrintWarning(pc, bp);
+ if (__msan::flags()->halt_on_error) {
+ if (__msan::flags()->print_stats)
+ ReportStats();
+ Printf("Exiting\n");
+ Die();
+ }
+}
+
+void __msan_warning_noreturn() {
+ GET_CALLER_PC_BP_SP;
+ (void)sp;
+ PrintWarning(pc, bp);
+ if (__msan::flags()->print_stats)
+ ReportStats();
+ Printf("Exiting\n");
+ Die();
+}
+
+static void OnStackUnwind(const SignalContext &sig, const void *,
+ BufferedStackTrace *stack) {
+ stack->Unwind(StackTrace::GetNextInstructionPc(sig.pc), sig.bp, sig.context,
+ common_flags()->fast_unwind_on_fatal);
+}
+
+static void MsanOnDeadlySignal(int signo, void *siginfo, void *context) {
+ HandleDeadlySignal(siginfo, context, GetTid(), &OnStackUnwind, nullptr);
+}
+
+static void MsanCheckFailed(const char *file, int line, const char *cond,
+ u64 v1, u64 v2) {
+ Report("MemorySanitizer CHECK failed: %s:%d \"%s\" (0x%zx, 0x%zx)\n", file,
+ line, cond, (uptr)v1, (uptr)v2);
+ PRINT_CURRENT_STACK_CHECK();
+ Die();
+}
+
+void __msan_init() {
+ CHECK(!msan_init_is_running);
+ if (msan_inited) return;
+ msan_init_is_running = 1;
+ SanitizerToolName = "MemorySanitizer";
+
+ AvoidCVE_2016_2143();
+
+ CacheBinaryName();
+ InitializeFlags();
+
+ // Install tool-specific callbacks in sanitizer_common.
+ SetCheckFailedCallback(MsanCheckFailed);
+
+ __sanitizer_set_report_path(common_flags()->log_path);
+
+ InitializeInterceptors();
+ CheckASLR();
+ InitTlsSize();
+ InstallDeadlySignalHandlers(MsanOnDeadlySignal);
+ InstallAtExitHandler(); // Needs __cxa_atexit interceptor.
+
+ DisableCoreDumperIfNecessary();
+ if (StackSizeIsUnlimited()) {
+ VPrintf(1, "Unlimited stack, doing reexec\n");
+ // A reasonably large stack size. It is bigger than the usual 8Mb, because,
+ // well, the program could have been run with unlimited stack for a reason.
+ SetStackSizeLimitInBytes(32 * 1024 * 1024);
+ ReExec();
+ }
+
+ __msan_clear_on_return();
+ if (__msan_get_track_origins())
+ VPrintf(1, "msan_track_origins\n");
+ if (!InitShadow(__msan_get_track_origins())) {
+ Printf("FATAL: MemorySanitizer can not mmap the shadow memory.\n");
+ Printf("FATAL: Make sure to compile with -fPIE and to link with -pie.\n");
+ Printf("FATAL: Disabling ASLR is known to cause this error.\n");
+ Printf("FATAL: If running under GDB, try "
+ "'set disable-randomization off'.\n");
+ DumpProcessMap();
+ Die();
+ }
+
+ Symbolizer::GetOrInit()->AddHooks(EnterSymbolizer, ExitSymbolizer);
+
+ InitializeCoverage(common_flags()->coverage, common_flags()->coverage_dir);
+
+ MsanTSDInit(MsanTSDDtor);
+
+ MsanAllocatorInit();
+
+ MsanThread *main_thread = MsanThread::Create(nullptr, nullptr);
+ SetCurrentThread(main_thread);
+ main_thread->ThreadStart();
+
+#if MSAN_CONTAINS_UBSAN
+ __ubsan::InitAsPlugin();
+#endif
+
+ VPrintf(1, "MemorySanitizer init done\n");
+
+ msan_init_is_running = 0;
+ msan_inited = 1;
+}
+
+void __msan_set_keep_going(int keep_going) {
+ flags()->halt_on_error = !keep_going;
+}
+
+void __msan_set_expect_umr(int expect_umr) {
+ if (expect_umr) {
+ msan_expected_umr_found = 0;
+ } else if (!msan_expected_umr_found) {
+ GET_CALLER_PC_BP_SP;
+ (void)sp;
+ GET_FATAL_STACK_TRACE_PC_BP(pc, bp);
+ ReportExpectedUMRNotFound(&stack);
+ Die();
+ }
+ msan_expect_umr = expect_umr;
+}
+
+void __msan_print_shadow(const void *x, uptr size) {
+ if (!MEM_IS_APP(x)) {
+ Printf("Not a valid application address: %p\n", x);
+ return;
+ }
+
+ DescribeMemoryRange(x, size);
+}
+
+void __msan_dump_shadow(const void *x, uptr size) {
+ if (!MEM_IS_APP(x)) {
+ Printf("Not a valid application address: %p\n", x);
+ return;
+ }
+
+ unsigned char *s = (unsigned char*)MEM_TO_SHADOW(x);
+ for (uptr i = 0; i < size; i++)
+ Printf("%x%x ", s[i] >> 4, s[i] & 0xf);
+ Printf("\n");
+}
+
+sptr __msan_test_shadow(const void *x, uptr size) {
+ if (!MEM_IS_APP(x)) return -1;
+ unsigned char *s = (unsigned char *)MEM_TO_SHADOW((uptr)x);
+ for (uptr i = 0; i < size; ++i)
+ if (s[i])
+ return i;
+ return -1;
+}
+
+void __msan_check_mem_is_initialized(const void *x, uptr size) {
+ if (!__msan::flags()->report_umrs) return;
+ sptr offset = __msan_test_shadow(x, size);
+ if (offset < 0)
+ return;
+
+ GET_CALLER_PC_BP_SP;
+ (void)sp;
+ ReportUMRInsideAddressRange(__func__, x, size, offset);
+ __msan::PrintWarningWithOrigin(pc, bp,
+ __msan_get_origin(((const char *)x) + offset));
+ if (__msan::flags()->halt_on_error) {
+ Printf("Exiting\n");
+ Die();
+ }
+}
+
+int __msan_set_poison_in_malloc(int do_poison) {
+ int old = flags()->poison_in_malloc;
+ flags()->poison_in_malloc = do_poison;
+ return old;
+}
+
+int __msan_has_dynamic_component() { return false; }
+
+NOINLINE
+void __msan_clear_on_return() {
+ __msan_param_tls[0] = 0;
+}
+
+void __msan_partial_poison(const void* data, void* shadow, uptr size) {
+ internal_memcpy((void*)MEM_TO_SHADOW((uptr)data), shadow, size);
+}
+
+void __msan_load_unpoisoned(const void *src, uptr size, void *dst) {
+ internal_memcpy(dst, src, size);
+ __msan_unpoison(dst, size);
+}
+
+void __msan_set_origin(const void *a, uptr size, u32 origin) {
+ if (__msan_get_track_origins()) SetOrigin(a, size, origin);
+}
+
+// 'descr' is created at compile time and contains '----' in the beginning.
+// When we see descr for the first time we replace '----' with a uniq id
+// and set the origin to (id | (31-th bit)).
+void __msan_set_alloca_origin(void *a, uptr size, char *descr) {
+ __msan_set_alloca_origin4(a, size, descr, 0);
+}
+
+void __msan_set_alloca_origin4(void *a, uptr size, char *descr, uptr pc) {
+ static const u32 dash = '-';
+ static const u32 first_timer =
+ dash + (dash << 8) + (dash << 16) + (dash << 24);
+ u32 *id_ptr = (u32*)descr;
+ bool print = false; // internal_strstr(descr + 4, "AllocaTOTest") != 0;
+ u32 id = *id_ptr;
+ if (id == first_timer) {
+ u32 idx = atomic_fetch_add(&NumStackOriginDescrs, 1, memory_order_relaxed);
+ CHECK_LT(idx, kNumStackOriginDescrs);
+ StackOriginDescr[idx] = descr + 4;
+#if SANITIZER_PPC64V1
+ // On PowerPC64 ELFv1, the address of a function actually points to a
+ // three-doubleword data structure with the first field containing
+ // the address of the function's code.
+ if (pc)
+ pc = *reinterpret_cast<uptr*>(pc);
+#endif
+ StackOriginPC[idx] = pc;
+ id = Origin::CreateStackOrigin(idx).raw_id();
+ *id_ptr = id;
+ if (print)
+ Printf("First time: idx=%d id=%d %s %p \n", idx, id, descr + 4, pc);
+ }
+ if (print)
+ Printf("__msan_set_alloca_origin: descr=%s id=%x\n", descr + 4, id);
+ __msan_set_origin(a, size, id);
+}
+
+u32 __msan_chain_origin(u32 id) {
+ GET_CALLER_PC_BP_SP;
+ (void)sp;
+ GET_STORE_STACK_TRACE_PC_BP(pc, bp);
+ return ChainOrigin(id, &stack);
+}
+
+u32 __msan_get_origin(const void *a) {
+ if (!__msan_get_track_origins()) return 0;
+ uptr x = (uptr)a;
+ uptr aligned = x & ~3ULL;
+ uptr origin_ptr = MEM_TO_ORIGIN(aligned);
+ return *(u32*)origin_ptr;
+}
+
+int __msan_origin_is_descendant_or_same(u32 this_id, u32 prev_id) {
+ Origin o = Origin::FromRawId(this_id);
+ while (o.raw_id() != prev_id && o.isChainedOrigin())
+ o = o.getNextChainedOrigin(nullptr);
+ return o.raw_id() == prev_id;
+}
+
+u32 __msan_get_umr_origin() {
+ return __msan_origin_tls;
+}
+
+u16 __sanitizer_unaligned_load16(const uu16 *p) {
+ *(uu16 *)&__msan_retval_tls[0] = *(uu16 *)MEM_TO_SHADOW((uptr)p);
+ if (__msan_get_track_origins())
+ __msan_retval_origin_tls = GetOriginIfPoisoned((uptr)p, sizeof(*p));
+ return *p;
+}
+u32 __sanitizer_unaligned_load32(const uu32 *p) {
+ *(uu32 *)&__msan_retval_tls[0] = *(uu32 *)MEM_TO_SHADOW((uptr)p);
+ if (__msan_get_track_origins())
+ __msan_retval_origin_tls = GetOriginIfPoisoned((uptr)p, sizeof(*p));
+ return *p;
+}
+u64 __sanitizer_unaligned_load64(const uu64 *p) {
+ __msan_retval_tls[0] = *(uu64 *)MEM_TO_SHADOW((uptr)p);
+ if (__msan_get_track_origins())
+ __msan_retval_origin_tls = GetOriginIfPoisoned((uptr)p, sizeof(*p));
+ return *p;
+}
+void __sanitizer_unaligned_store16(uu16 *p, u16 x) {
+ u16 s = *(uu16 *)&__msan_param_tls[1];
+ *(uu16 *)MEM_TO_SHADOW((uptr)p) = s;
+ if (s && __msan_get_track_origins())
+ if (uu32 o = __msan_param_origin_tls[2])
+ SetOriginIfPoisoned((uptr)p, (uptr)&s, sizeof(s), o);
+ *p = x;
+}
+void __sanitizer_unaligned_store32(uu32 *p, u32 x) {
+ u32 s = *(uu32 *)&__msan_param_tls[1];
+ *(uu32 *)MEM_TO_SHADOW((uptr)p) = s;
+ if (s && __msan_get_track_origins())
+ if (uu32 o = __msan_param_origin_tls[2])
+ SetOriginIfPoisoned((uptr)p, (uptr)&s, sizeof(s), o);
+ *p = x;
+}
+void __sanitizer_unaligned_store64(uu64 *p, u64 x) {
+ u64 s = __msan_param_tls[1];
+ *(uu64 *)MEM_TO_SHADOW((uptr)p) = s;
+ if (s && __msan_get_track_origins())
+ if (uu32 o = __msan_param_origin_tls[2])
+ SetOriginIfPoisoned((uptr)p, (uptr)&s, sizeof(s), o);
+ *p = x;
+}
+
+void __msan_set_death_callback(void (*callback)(void)) {
+ SetUserDieCallback(callback);
+}
+
+#if !SANITIZER_SUPPORTS_WEAK_HOOKS
+extern "C" {
+SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
+const char* __msan_default_options() { return ""; }
+} // extern "C"
+#endif
+
+extern "C" {
+SANITIZER_INTERFACE_ATTRIBUTE
+void __sanitizer_print_stack_trace() {
+ GET_FATAL_STACK_TRACE_PC_BP(StackTrace::GetCurrentPc(), GET_CURRENT_FRAME());
+ stack.Print();
+}
+} // extern "C"