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784 lines (660 loc) · 21.8 KB
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#if HAVE_FFI
#include "data.h"
#include "base_object-inl.h"
#include "node_errors.h"
#include "util.h"
#include "v8.h"
#include <cmath>
#include <cstdint>
#include <cstring>
#include <limits>
#include <type_traits>
using v8::ArrayBuffer;
using v8::ArrayBufferView;
using v8::BackingStore;
using v8::BigInt;
using v8::Context;
using v8::FunctionCallbackInfo;
using v8::Integer;
using v8::Isolate;
using v8::Just;
using v8::JustVoid;
using v8::Local;
using v8::Maybe;
using v8::MaybeLocal;
using v8::NewStringType;
using v8::Nothing;
using v8::Number;
using v8::Object;
using v8::SharedArrayBuffer;
using v8::String;
using v8::Value;
namespace node {
namespace ffi {
Maybe<size_t> GetValidatedSize(Environment* env,
Local<Value> value,
const char* label) {
if (!value->IsNumber()) {
THROW_ERR_INVALID_ARG_VALUE(env, "The %s must be a number", label);
return Nothing<size_t>();
}
double length = value.As<Number>()->Value();
if (!std::isfinite(length) || length < 0 || std::floor(length) != length) {
THROW_ERR_INVALID_ARG_VALUE(
env, "The %s must be a non-negative integer", label);
return Nothing<size_t>();
}
if (length > static_cast<double>(std::numeric_limits<size_t>::max())) {
THROW_ERR_OUT_OF_RANGE(env, "The %s is too large", label);
return Nothing<size_t>();
}
return Just(static_cast<size_t>(length));
}
Maybe<uintptr_t> GetValidatedPointerAddress(Environment* env,
Local<Value> value,
const char* label) {
if (!value->IsBigInt()) {
THROW_ERR_INVALID_ARG_VALUE(env, "The %s must be a bigint", label);
return Nothing<uintptr_t>();
}
bool lossless;
uint64_t address = value.As<BigInt>()->Uint64Value(&lossless);
if (!lossless) {
THROW_ERR_INVALID_ARG_VALUE(
env, "The %s must be a non-negative bigint", label);
return Nothing<uintptr_t>();
}
if (address > static_cast<uint64_t>(std::numeric_limits<uintptr_t>::max())) {
THROW_ERR_INVALID_ARG_VALUE(
env, "The %s exceeds the platform pointer range", label);
return Nothing<uintptr_t>();
}
return Just(static_cast<uintptr_t>(address));
}
Maybe<int64_t> GetValidatedSignedInt(Environment* env,
Local<Value> value,
int64_t min,
int64_t max,
const char* type_name) {
if (!value->IsNumber()) {
THROW_ERR_INVALID_ARG_VALUE(env, "Value must be an %s", type_name);
return Nothing<int64_t>();
}
double number = value.As<Number>()->Value();
if (!std::isfinite(number) || std::floor(number) != number || number < min ||
number > max) {
THROW_ERR_INVALID_ARG_VALUE(env, "Value must be an %s", type_name);
return Nothing<int64_t>();
}
return Just(static_cast<int64_t>(number));
}
Maybe<uint64_t> GetValidatedUnsignedInt(Environment* env,
Local<Value> value,
uint64_t max,
const char* type_name) {
if (!value->IsNumber()) {
THROW_ERR_INVALID_ARG_VALUE(env, "Value must be a %s", type_name);
return Nothing<uint64_t>();
}
double number = value.As<Number>()->Value();
if (!std::isfinite(number) || std::floor(number) != number || number < 0 ||
number > static_cast<double>(max)) {
THROW_ERR_INVALID_ARG_VALUE(env, "Value must be a %s", type_name);
return Nothing<uint64_t>();
}
return Just(static_cast<uint64_t>(number));
}
Maybe<void> ValidatePointerSpan(Environment* env,
uintptr_t raw_ptr,
size_t offset,
size_t length,
const char* error_message) {
if (offset > std::numeric_limits<uintptr_t>::max() - raw_ptr) {
THROW_ERR_INVALID_ARG_VALUE(env, error_message);
return Nothing<void>();
}
uintptr_t start = raw_ptr + offset;
if (length > 0 &&
length - 1 > std::numeric_limits<uintptr_t>::max() - start) {
THROW_ERR_INVALID_ARG_VALUE(env, error_message);
return Nothing<void>();
}
return JustVoid();
}
Maybe<void> ValidateBufferLength(Environment* env, size_t len) {
if (len > Buffer::kMaxLength) {
THROW_ERR_BUFFER_TOO_LARGE(env, "Buffer is too large");
return Nothing<void>();
}
return JustVoid();
}
Maybe<void> ValidateStringLength(Environment* env, size_t len) {
if (len > static_cast<size_t>(String::kMaxLength)) {
THROW_ERR_STRING_TOO_LONG(env, "String is too long");
return Nothing<void>();
}
return JustVoid();
}
Maybe<std::pair<uint8_t*, size_t>> GetValidatedPointerAndOffset(
Environment* env, const FunctionCallbackInfo<Value>& args) {
uintptr_t raw_ptr;
if (args.Length() < 1 ||
!GetValidatedPointerAddress(env, args[0], "pointer").To(&raw_ptr)) {
return {};
}
if (raw_ptr == 0) {
THROW_ERR_FFI_INVALID_POINTER(env, "Cannot dereference a null pointer");
return {};
}
size_t offset = 0;
if (args.Length() > 1 && !args[1]->IsUndefined()) {
if (!GetValidatedSize(env, args[1], "offset").To(&offset)) {
return {};
}
}
if (ValidatePointerSpan(
env,
raw_ptr,
offset,
1,
"The pointer and offset exceed the platform address range")
.IsNothing()) {
return {};
}
return Just(std::make_pair(reinterpret_cast<uint8_t*>(raw_ptr), offset));
}
struct PointerOffsetAndValue {
uint8_t* ptr;
size_t offset;
Local<Value> value;
};
Maybe<PointerOffsetAndValue> GetValidatedPointerOffsetAndValue(
Environment* env, const FunctionCallbackInfo<Value>& args) {
size_t offset;
Local<Value> value;
uintptr_t raw_ptr;
if (args.Length() < 1 ||
!GetValidatedPointerAddress(env, args[0], "pointer").To(&raw_ptr)) {
return {};
}
if (raw_ptr == 0) {
THROW_ERR_FFI_INVALID_POINTER(env, "Cannot dereference a null pointer");
return {};
}
if (args.Length() < 2 || args[1]->IsUndefined()) {
THROW_ERR_INVALID_ARG_VALUE(env, "Expected an offset argument");
return {};
}
if (!GetValidatedSize(env, args[1], "offset").To(&offset)) {
return {};
}
if (ValidatePointerSpan(
env,
raw_ptr,
offset,
1,
"The pointer and offset exceed the platform address range")
.IsNothing()) {
return {};
}
if (args.Length() < 3 || args[2]->IsUndefined()) {
THROW_ERR_INVALID_ARG_VALUE(env, "Expected a value argument");
return {};
}
value = args[2];
uint8_t* ptr = reinterpret_cast<uint8_t*>(static_cast<uintptr_t>(raw_ptr));
return Just(PointerOffsetAndValue{ptr, offset, value});
}
template <typename T>
void GetValue(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
THROW_IF_INSUFFICIENT_PERMISSIONS(env, permission::PermissionScope::kFFI, "");
Isolate* isolate = env->isolate();
std::pair<uint8_t*, size_t> ptr_and_offset;
if (!GetValidatedPointerAndOffset(env, args).To(&ptr_and_offset)) {
return;
}
auto [ptr, offset] = ptr_and_offset;
uintptr_t raw_ptr = reinterpret_cast<uintptr_t>(ptr);
if (ValidatePointerSpan(
env,
raw_ptr,
offset,
sizeof(T),
"The accessed range exceeds the platform address range")
.IsNothing()) {
return;
}
T value;
std::memcpy(&value, ptr + offset, sizeof(value));
if constexpr (std::is_same_v<T, int8_t> || std::is_same_v<T, int16_t> ||
std::is_same_v<T, int32_t>) {
args.GetReturnValue().Set(Integer::New(isolate, value));
} else if constexpr (std::is_same_v<T, uint8_t> ||
std::is_same_v<T, uint16_t> ||
std::is_same_v<T, uint32_t>) {
args.GetReturnValue().Set(Integer::NewFromUnsigned(isolate, value));
} else if constexpr (std::is_same_v<T, int64_t>) {
args.GetReturnValue().Set(BigInt::New(isolate, value));
} else if constexpr (std::is_same_v<T, uint64_t>) {
args.GetReturnValue().Set(BigInt::NewFromUnsigned(isolate, value));
} else if constexpr (std::is_same_v<T, float> || std::is_same_v<T, double>) {
args.GetReturnValue().Set(Number::New(isolate, value));
} else {
UNREACHABLE();
}
}
template <typename T>
void SetValue(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
THROW_IF_INSUFFICIENT_PERMISSIONS(env, permission::PermissionScope::kFFI, "");
PointerOffsetAndValue data;
if (!GetValidatedPointerOffsetAndValue(env, args).To(&data)) {
return;
}
auto [ptr, offset, value] = data;
uintptr_t raw_ptr = reinterpret_cast<uintptr_t>(ptr);
if (ValidatePointerSpan(
env,
raw_ptr,
offset,
sizeof(T),
"The accessed range exceeds the platform address range")
.IsNothing()) {
return;
}
T converted;
Local<Context> context = env->context();
if constexpr (std::is_same_v<T, int8_t>) {
int64_t validated;
if (!GetValidatedSignedInt(env, value, INT8_MIN, INT8_MAX, "int8")
.To(&validated)) {
return;
}
converted = static_cast<T>(validated);
} else if constexpr (std::is_same_v<T, uint8_t>) {
uint64_t validated;
if (!GetValidatedUnsignedInt(env, value, UINT8_MAX, "uint8")
.To(&validated)) {
return;
}
converted = static_cast<T>(validated);
} else if constexpr (std::is_same_v<T, int16_t>) {
int64_t validated;
if (!GetValidatedSignedInt(env, value, INT16_MIN, INT16_MAX, "int16")
.To(&validated)) {
return;
}
converted = static_cast<T>(validated);
} else if constexpr (std::is_same_v<T, uint16_t>) {
uint64_t validated;
if (!GetValidatedUnsignedInt(env, value, UINT16_MAX, "uint16")
.To(&validated)) {
return;
}
converted = static_cast<T>(validated);
} else if constexpr (std::is_same_v<T, int32_t>) {
int64_t validated;
if (!GetValidatedSignedInt(env, value, INT32_MIN, INT32_MAX, "int32")
.To(&validated)) {
return;
}
converted = static_cast<T>(validated);
} else if constexpr (std::is_same_v<T, uint32_t>) {
uint64_t validated;
if (!GetValidatedUnsignedInt(env, value, UINT32_MAX, "uint32")
.To(&validated)) {
return;
}
converted = static_cast<T>(validated);
} else if constexpr (std::is_same_v<T, int64_t>) {
if (value->IsBigInt()) {
bool lossless;
converted = static_cast<T>(value.As<BigInt>()->Int64Value(&lossless));
if (!lossless) {
THROW_ERR_INVALID_ARG_VALUE(env, "Value must be an int64");
return;
}
} else if (value->IsNumber()) {
int64_t validated;
if (!GetValidatedSignedInt(env,
value,
-static_cast<int64_t>(kMaxSafeJsInteger),
static_cast<int64_t>(kMaxSafeJsInteger),
"int64")
.To(&validated)) {
return;
}
converted = static_cast<T>(validated);
} else {
THROW_ERR_INVALID_ARG_VALUE(env, "Value must be a bigint or a number");
return;
}
} else if constexpr (std::is_same_v<T, uint64_t>) {
if (value->IsBigInt()) {
bool lossless;
converted = static_cast<T>(value.As<BigInt>()->Uint64Value(&lossless));
if (!lossless) {
THROW_ERR_INVALID_ARG_VALUE(env, "Value must be a uint64");
return;
}
} else if (value->IsNumber()) {
uint64_t validated;
if (!GetValidatedUnsignedInt(
env, value, static_cast<uint64_t>(kMaxSafeJsInteger), "uint64")
.To(&validated)) {
return;
}
converted = static_cast<T>(validated);
} else {
THROW_ERR_INVALID_ARG_VALUE(env, "Value must be a bigint or a number");
return;
}
} else if constexpr (std::is_same_v<T, float> || std::is_same_v<T, double>) {
MaybeLocal<Number> number = value->ToNumber(context);
Local<Number> number_local;
if (!number.ToLocal(&number_local)) {
THROW_ERR_INVALID_ARG_VALUE(env, "Value must be a number");
return;
}
converted = static_cast<T>(number_local->Value());
} else {
UNREACHABLE();
}
std::memcpy(ptr + offset, &converted, sizeof(converted));
}
// Raw FFI memory helpers are low-level and unsafe. Pointer validity,
// lifetime, and zero-copy writable views are the caller's responsibility.
void GetInt8(const FunctionCallbackInfo<Value>& args) {
GetValue<int8_t>(args);
}
void GetUint8(const FunctionCallbackInfo<Value>& args) {
GetValue<uint8_t>(args);
}
void GetInt16(const FunctionCallbackInfo<Value>& args) {
GetValue<int16_t>(args);
}
void GetUint16(const FunctionCallbackInfo<Value>& args) {
GetValue<uint16_t>(args);
}
void GetInt32(const FunctionCallbackInfo<Value>& args) {
GetValue<int32_t>(args);
}
void GetUint32(const FunctionCallbackInfo<Value>& args) {
GetValue<uint32_t>(args);
}
void GetInt64(const FunctionCallbackInfo<Value>& args) {
GetValue<int64_t>(args);
}
void GetUint64(const FunctionCallbackInfo<Value>& args) {
GetValue<uint64_t>(args);
}
void GetFloat32(const FunctionCallbackInfo<Value>& args) {
GetValue<float>(args);
}
void GetFloat64(const FunctionCallbackInfo<Value>& args) {
GetValue<double>(args);
}
void SetInt8(const FunctionCallbackInfo<Value>& args) {
SetValue<int8_t>(args);
}
void SetUint8(const FunctionCallbackInfo<Value>& args) {
SetValue<uint8_t>(args);
}
void SetInt16(const FunctionCallbackInfo<Value>& args) {
SetValue<int16_t>(args);
}
void SetUint16(const FunctionCallbackInfo<Value>& args) {
SetValue<uint16_t>(args);
}
void SetInt32(const FunctionCallbackInfo<Value>& args) {
SetValue<int32_t>(args);
}
void SetUint32(const FunctionCallbackInfo<Value>& args) {
SetValue<uint32_t>(args);
}
void SetInt64(const FunctionCallbackInfo<Value>& args) {
SetValue<int64_t>(args);
}
void SetUint64(const FunctionCallbackInfo<Value>& args) {
SetValue<uint64_t>(args);
}
void SetFloat32(const FunctionCallbackInfo<Value>& args) {
SetValue<float>(args);
}
void SetFloat64(const FunctionCallbackInfo<Value>& args) {
SetValue<double>(args);
}
void ToString(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
Isolate* isolate = env->isolate();
// Raw FFI memory helpers are low-level and unsafe. Pointer validity,
// lifetime, and zero-copy writable views are the caller's responsibility.
// `toString()` requires a valid NUL-terminated C string pointer.
THROW_IF_INSUFFICIENT_PERMISSIONS(env, permission::PermissionScope::kFFI, "");
if (args.Length() < 1 || !args[0]->IsBigInt()) {
THROW_ERR_INVALID_ARG_TYPE(env, "The first argument must be a bigint");
return;
}
uintptr_t ptr;
if (!GetValidatedPointerAddress(env, args[0], "first argument").To(&ptr)) {
return;
}
if (ptr == 0) {
args.GetReturnValue().SetNull();
return;
}
const char* str = reinterpret_cast<const char*>(ptr);
size_t len = std::strlen(str);
if (ValidateStringLength(env, len).IsNothing()) {
return;
}
Local<String> out;
if (!String::NewFromUtf8(isolate, str, NewStringType::kNormal, len)
.ToLocal(&out)) {
return;
}
args.GetReturnValue().Set(out);
}
void ToBuffer(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
Isolate* isolate = env->isolate();
THROW_IF_INSUFFICIENT_PERMISSIONS(env, permission::PermissionScope::kFFI, "");
// `copy === false` exposes a zero-copy writable view over foreign memory.
// This is intentionally unsafe and the caller must guarantee pointer
// validity, lifetime, and bounds.
if (args.Length() < 1 || !args[0]->IsBigInt()) {
THROW_ERR_INVALID_ARG_TYPE(env, "The first argument must be a bigint");
return;
}
uintptr_t ptr;
if (!GetValidatedPointerAddress(env, args[0], "first argument").To(&ptr)) {
return;
}
size_t len;
if (args.Length() < 2 || !GetValidatedSize(env, args[1], "length").To(&len)) {
return;
}
if (ptr == 0 && len > 0) {
THROW_ERR_FFI_INVALID_POINTER(env,
"Cannot create a buffer from a null pointer");
return;
}
if (ValidatePointerSpan(
env,
ptr,
0,
len,
"The pointer and length exceed the platform address range")
.IsNothing()) {
return;
}
if (ValidateBufferLength(env, len).IsNothing()) {
return;
}
Local<Object> buf;
if (args.Length() < 3 || args[2]->IsUndefined() ||
args[2]->BooleanValue(isolate)) {
if (!Buffer::Copy(env, reinterpret_cast<char*>(ptr), len).ToLocal(&buf)) {
return;
}
} else {
if (!Buffer::New(
env,
reinterpret_cast<char*>(ptr),
len,
[](char* data, void* hint) {},
nullptr)
.ToLocal(&buf)) {
return;
}
}
args.GetReturnValue().Set(buf);
}
void ToArrayBuffer(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
Isolate* isolate = env->isolate();
THROW_IF_INSUFFICIENT_PERMISSIONS(env, permission::PermissionScope::kFFI, "");
if (args.Length() < 1 || !args[0]->IsBigInt()) {
THROW_ERR_INVALID_ARG_TYPE(env, "The first argument must be a bigint");
return;
}
uintptr_t ptr;
if (!GetValidatedPointerAddress(env, args[0], "first argument").To(&ptr)) {
return;
}
size_t len;
if (args.Length() < 2 || !GetValidatedSize(env, args[1], "length").To(&len)) {
return;
}
if (ptr == 0 && len > 0) {
THROW_ERR_FFI_INVALID_POINTER(
env, "Cannot create an ArrayBuffer from a null pointer");
return;
}
if (ValidatePointerSpan(
env,
ptr,
0,
len,
"The pointer and length exceed the platform address range")
.IsNothing()) {
return;
}
if (ValidateBufferLength(env, len).IsNothing()) {
return;
}
Local<ArrayBuffer> ab;
if (args.Length() < 3 || args[2]->IsUndefined() ||
args[2]->BooleanValue(isolate)) {
std::unique_ptr<BackingStore> store =
ArrayBuffer::NewBackingStore(isolate, len);
memcpy(store->Data(), reinterpret_cast<void*>(ptr), len);
ab = ArrayBuffer::New(isolate, std::move(store));
} else {
std::unique_ptr<BackingStore> store = ArrayBuffer::NewBackingStore(
reinterpret_cast<void*>(ptr),
len,
[](void* data, size_t length, void* deleter_data) {},
nullptr);
ab = ArrayBuffer::New(isolate, std::move(store));
}
args.GetReturnValue().Set(ab);
}
void ExportBytes(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
THROW_IF_INSUFFICIENT_PERMISSIONS(env, permission::PermissionScope::kFFI, "");
if (args.Length() < 1) {
THROW_ERR_INVALID_ARG_TYPE(
env,
"The first argument must be a Buffer, ArrayBuffer, or ArrayBufferView");
return;
}
// This needs to be kept alive until the data
// is actually copied.
ArrayBufferViewContents<uint8_t> view;
if (args[0]->IsArrayBuffer() || args[0]->IsSharedArrayBuffer() ||
args[0]->IsArrayBufferView()) {
view.ReadValue(args[0]);
if (view.WasDetached()) {
THROW_ERR_INVALID_ARG_VALUE(env, "Invalid ArrayBufferView backing store");
return;
}
} else {
THROW_ERR_INVALID_ARG_TYPE(
env,
"The first argument must be a Buffer, ArrayBuffer, or ArrayBufferView");
return;
}
uintptr_t ptr;
if (args.Length() < 2 ||
!GetValidatedPointerAddress(env, args[1], "pointer").To(&ptr)) {
return;
}
size_t len;
if (args.Length() < 3 || !GetValidatedSize(env, args[2], "length").To(&len)) {
return;
}
if (len < view.length()) {
THROW_ERR_OUT_OF_RANGE(env, "The length must be >= source byte length");
return;
}
if (ptr == 0 && view.length() > 0) {
THROW_ERR_FFI_INVALID_POINTER(env,
"Cannot create a buffer from a null pointer");
return;
}
if (ValidatePointerSpan(
env,
ptr,
0,
len,
"The pointer and length exceed the platform address range")
.IsNothing()) {
return;
}
std::memcpy(reinterpret_cast<void*>(ptr), view.data(), view.length());
}
void GetRawPointer(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
Isolate* isolate = env->isolate();
THROW_IF_INSUFFICIENT_PERMISSIONS(env, permission::PermissionScope::kFFI, "");
if (args.Length() < 1) {
THROW_ERR_INVALID_ARG_TYPE(
env,
"The first argument must be a Buffer, ArrayBuffer, or ArrayBufferView");
return;
}
uintptr_t ptr = 0;
size_t offset = 0;
std::shared_ptr<BackingStore> store;
if (args[0]->IsArrayBuffer()) {
store = args[0].As<ArrayBuffer>()->GetBackingStore();
} else if (args[0]->IsSharedArrayBuffer()) {
store = args[0].As<SharedArrayBuffer>()->GetBackingStore();
} else if (args[0]->IsArrayBufferView()) {
// Access the store here to ensure that it exists. Small typed arrays
// may not have a store until this point and can instead be stored
// entirely in-heap.
store = args[0].As<ArrayBufferView>()->Buffer()->GetBackingStore();
offset = args[0].As<ArrayBufferView>()->ByteOffset();
} else {
THROW_ERR_INVALID_ARG_TYPE(env,
"The first argument must be a Buffer, "
"ArrayBuffer, or ArrayBufferView");
return;
}
// WARNING: There is no inherent guarantee that the pointer returned
// from this function will be valid beyond the lifetime of the BackingStore
// instance!
if (!store) {
THROW_ERR_INVALID_ARG_VALUE(env, "Invalid ArrayBuffer backing store");
return;
}
ptr = reinterpret_cast<uintptr_t>(store->Data()) + offset;
args.GetReturnValue().Set(
BigInt::NewFromUnsigned(isolate, static_cast<uint64_t>(ptr)));
}
} // namespace ffi
} // namespace node
#endif // HAVE_FFI