| //===-- 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" |