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- //===-- 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_poisoning.h"
- #include "msan_report.h"
- #include "msan_thread.h"
- #include "sanitizer_common/sanitizer_atomic.h"
- #include "sanitizer_common/sanitizer_common.h"
- #include "sanitizer_common/sanitizer_flag_parser.h"
- #include "sanitizer_common/sanitizer_flags.h"
- #include "sanitizer_common/sanitizer_interface_internal.h"
- #include "sanitizer_common/sanitizer_libc.h"
- #include "sanitizer_common/sanitizer_procmaps.h"
- #include "sanitizer_common/sanitizer_stackdepot.h"
- #include "sanitizer_common/sanitizer_stacktrace.h"
- #include "sanitizer_common/sanitizer_symbolizer.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;
- 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 {
- static THREADLOCAL int is_in_symbolizer_or_unwinder;
- static void EnterSymbolizerOrUnwider() { ++is_in_symbolizer_or_unwinder; }
- static void ExitSymbolizerOrUnwider() { --is_in_symbolizer_or_unwinder; }
- bool IsInSymbolizerOrUnwider() { return is_in_symbolizer_or_unwinder; }
- struct UnwinderScope {
- UnwinderScope() { EnterSymbolizerOrUnwider(); }
- ~UnwinderScope() { ExitSymbolizerOrUnwider(); }
- };
- 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 final : 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;
- }
- bool Format(char *buffer, uptr size) final {
- const char *keep_going_str = (*halt_on_error_) ? "false" : "true";
- return FormatString(buffer, size, keep_going_str);
- }
- };
- 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;
- 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.
- parser.ParseString(__msan_default_options());
- #if MSAN_CONTAINS_UBSAN
- const char *ubsan_default_options = __ubsan_default_options();
- 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 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();
- }
- // Current implementation separates the 'id_ptr' from the 'descr' and makes
- // 'descr' constant.
- // Previous implementation '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)).
- static inline void SetAllocaOrigin(void *a, uptr size, u32 *id_ptr, char *descr,
- uptr pc) {
- static const u32 dash = '-';
- static const u32 first_timer =
- dash + (dash << 8) + (dash << 16) + (dash << 24);
- u32 id = *id_ptr;
- if (id == 0 || id == first_timer) {
- u32 idx = atomic_fetch_add(&NumStackOriginDescrs, 1, memory_order_relaxed);
- CHECK_LT(idx, kNumStackOriginDescrs);
- StackOriginDescr[idx] = descr;
- StackOriginPC[idx] = pc;
- id = Origin::CreateStackOrigin(idx).raw_id();
- *id_ptr = id;
- }
- __msan_set_origin(a, size, 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.
- UnwinderScope sym_scope;
- return Unwind(max_depth, pc, bp, context, t ? t->stack_top() : 0,
- t ? t->stack_bottom() : 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;
- PrintWarningWithOrigin(pc, bp, 0);
- 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;
- PrintWarningWithOrigin(pc, bp, 0);
- if (__msan::flags()->print_stats)
- ReportStats();
- Printf("Exiting\n");
- Die();
- }
- void __msan_warning_with_origin(u32 origin) {
- GET_CALLER_PC_BP_SP;
- (void)sp;
- PrintWarningWithOrigin(pc, bp, origin);
- if (__msan::flags()->halt_on_error) {
- if (__msan::flags()->print_stats)
- ReportStats();
- Printf("Exiting\n");
- Die();
- }
- }
- void __msan_warning_with_origin_noreturn(u32 origin) {
- GET_CALLER_PC_BP_SP;
- (void)sp;
- PrintWarningWithOrigin(pc, bp, origin);
- 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 CheckUnwind() {
- GET_FATAL_STACK_TRACE_PC_BP(StackTrace::GetCurrentPc(), GET_CURRENT_FRAME());
- stack.Print();
- }
- 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.
- SetCheckUnwindCallback(CheckUnwind);
- __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(EnterSymbolizerOrUnwider,
- ExitSymbolizerOrUnwider);
- InitializeCoverage(common_flags()->coverage, common_flags()->coverage_dir);
- MsanTSDInit(MsanTSDDtor);
- MsanAllocatorInit();
- MsanThread *main_thread = MsanThread::Create(nullptr, nullptr);
- SetCurrentThread(main_thread);
- main_thread->Init();
- #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);
- Printf("%p[%p] ", (void *)s, 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);
- if (__sanitizer::mem_is_zero((const char *)s, size))
- return -1;
- // Slow path: loop through again to find the location.
- 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);
- }
- void __msan_set_alloca_origin(void *a, uptr size, char *descr) {
- SetAllocaOrigin(a, size, reinterpret_cast<u32 *>(descr), descr + 4,
- GET_CALLER_PC());
- }
- void __msan_set_alloca_origin4(void *a, uptr size, char *descr, uptr pc) {
- // Intentionally ignore pc and use return address. This function is here for
- // compatibility, in case program is linked with library instrumented by
- // older clang.
- SetAllocaOrigin(a, size, reinterpret_cast<u32 *>(descr), descr + 4,
- GET_CALLER_PC());
- }
- void __msan_set_alloca_origin_with_descr(void *a, uptr size, u32 *id_ptr,
- char *descr) {
- SetAllocaOrigin(a, size, id_ptr, descr, GET_CALLER_PC());
- }
- void __msan_set_alloca_origin_no_descr(void *a, uptr size, u32 *id_ptr) {
- SetAllocaOrigin(a, size, id_ptr, nullptr, GET_CALLER_PC());
- }
- 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) {
- internal_memcpy(&__msan_retval_tls[0], (void *)MEM_TO_SHADOW((uptr)p),
- sizeof(uu16));
- if (__msan_get_track_origins())
- __msan_retval_origin_tls = GetOriginIfPoisoned((uptr)p, sizeof(*p));
- return *p;
- }
- u32 __sanitizer_unaligned_load32(const uu32 *p) {
- internal_memcpy(&__msan_retval_tls[0], (void *)MEM_TO_SHADOW((uptr)p),
- sizeof(uu32));
- if (__msan_get_track_origins())
- __msan_retval_origin_tls = GetOriginIfPoisoned((uptr)p, sizeof(*p));
- return *p;
- }
- u64 __sanitizer_unaligned_load64(const uu64 *p) {
- internal_memcpy(&__msan_retval_tls[0], (void *)MEM_TO_SHADOW((uptr)p),
- sizeof(uu64));
- if (__msan_get_track_origins())
- __msan_retval_origin_tls = GetOriginIfPoisoned((uptr)p, sizeof(*p));
- return *p;
- }
- void __sanitizer_unaligned_store16(uu16 *p, u16 x) {
- static_assert(sizeof(uu16) == sizeof(u16), "incompatible types");
- u16 s;
- internal_memcpy(&s, &__msan_param_tls[1], sizeof(uu16));
- internal_memcpy((void *)MEM_TO_SHADOW((uptr)p), &s, sizeof(uu16));
- 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) {
- static_assert(sizeof(uu32) == sizeof(u32), "incompatible types");
- u32 s;
- internal_memcpy(&s, &__msan_param_tls[1], sizeof(uu32));
- internal_memcpy((void *)MEM_TO_SHADOW((uptr)p), &s, sizeof(uu32));
- 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);
- }
- void __msan_start_switch_fiber(const void *bottom, uptr size) {
- MsanThread *t = GetCurrentThread();
- if (!t) {
- VReport(1, "__msan_start_switch_fiber called from unknown thread\n");
- return;
- }
- t->StartSwitchFiber((uptr)bottom, size);
- }
- void __msan_finish_switch_fiber(const void **bottom_old, uptr *size_old) {
- MsanThread *t = GetCurrentThread();
- if (!t) {
- VReport(1, "__msan_finish_switch_fiber called from unknown thread\n");
- return;
- }
- t->FinishSwitchFiber((uptr *)bottom_old, (uptr *)size_old);
- 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));
- if (__msan_get_track_origins()) {
- internal_memset(__msan_param_origin_tls, 0,
- sizeof(__msan_param_origin_tls));
- internal_memset(&__msan_retval_origin_tls, 0,
- sizeof(__msan_retval_origin_tls));
- internal_memset(__msan_va_arg_origin_tls, 0,
- sizeof(__msan_va_arg_origin_tls));
- }
- }
- SANITIZER_INTERFACE_WEAK_DEF(const char *, __msan_default_options, void) {
- return "";
- }
- 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"
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