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src: make StreamBase prototype accessors more robust #16860

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15 changes: 11 additions & 4 deletions src/stream_base-inl.h
Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@

namespace node {

using v8::AccessorSignature;
using v8::External;
using v8::FunctionCallbackInfo;
using v8::FunctionTemplate;
Expand All @@ -31,27 +32,33 @@ void StreamBase::AddMethods(Environment* env,
HandleScope scope(env->isolate());

enum PropertyAttribute attributes =
static_cast<PropertyAttribute>(v8::ReadOnly | v8::DontDelete);
static_cast<PropertyAttribute>(
v8::ReadOnly | v8::DontDelete | v8::DontEnum);
Local<AccessorSignature> signature =
AccessorSignature::New(env->isolate(), t);
t->PrototypeTemplate()->SetAccessor(env->fd_string(),
GetFD<Base>,
nullptr,
env->as_external(),
v8::DEFAULT,
attributes);
attributes,
signature);

t->PrototypeTemplate()->SetAccessor(env->external_stream_string(),
GetExternal<Base>,
nullptr,
env->as_external(),
v8::DEFAULT,
attributes);
attributes,
signature);

t->PrototypeTemplate()->SetAccessor(env->bytes_read_string(),
GetBytesRead<Base>,
nullptr,
env->as_external(),
v8::DEFAULT,
attributes);
attributes,
signature);

env->SetProtoMethod(t, "readStart", JSMethod<Base, &StreamBase::ReadStart>);
env->SetProtoMethod(t, "readStop", JSMethod<Base, &StreamBase::ReadStop>);
Expand Down
Original file line number Diff line number Diff line change
@@ -0,0 +1,19 @@
'use strict';

require('../common');

// This tests that the prototype accessors added by StreamBase::AddMethods
// are not enumerable. They could be enumerated when inspecting the prototype
// with util.inspect or the inspector protocol.

const assert = require('assert');

// Or anything that calls StreamBase::AddMethods when setting up its prototype
const TTY = process.binding('tty_wrap').TTY;

{
assert.strictEqual(TTY.prototype.propertyIsEnumerable('bytesRead'), false);
assert.strictEqual(TTY.prototype.propertyIsEnumerable('fd'), false);
assert.strictEqual(
TTY.prototype.propertyIsEnumerable('_externalStream'), false);
}
27 changes: 27 additions & 0 deletions test/parallel/test-stream-base-prototype-accessors.js
Original file line number Diff line number Diff line change
@@ -0,0 +1,27 @@
'use strict';

require('../common');

// This tests that the prototype accessors added by StreamBase::AddMethods
// do not raise assersions when called with incompatible receivers.

const assert = require('assert');

// Or anything that calls StreamBase::AddMethods when setting up its prototype
const TTY = process.binding('tty_wrap').TTY;

// Should throw instead of raise assertions
{
const msg = /TypeError: Method \w+ called on incompatible receiver/;
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This is not engine-agnostic but I am not sure what ChakraCore throws for this..

assert.throws(() => {
TTY.prototype.bytesRead;
}, msg);

assert.throws(() => {
TTY.prototype.fd;
}, msg);

assert.throws(() => {
TTY.prototype._externalStream;
}, msg);
}