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llvm-project/compiler-rt/lib/msan/msan.cpp

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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 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();
}
// 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;
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();
}
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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