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vm: fix crash when setting __proto__ on context's globalThis #47939

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merged 3 commits into from
May 15, 2023
Merged

vm: fix crash when setting __proto__ on context's globalThis #47939

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184fc2d
vm: fix crash when setting __proto__ on context's globalThis
F3n67u May 9, 2023
7e11275
fixup! vm: fix crash when setting __proto__ on context's globalThis
F3n67u May 10, 2023
4bfdfc5
Update test/parallel/test-vm-set-proto-null-on-globalthis.js
F3n67u May 10, 2023
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3 changes: 2 additions & 1 deletion src/node_contextify.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -533,7 +533,8 @@ void ContextifyContext::PropertySetterCallback(
if (is_declared_on_sandbox &&
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ctx->sandbox()
->GetOwnPropertyDescriptor(context, property)
.ToLocal(&desc)) {
.ToLocal(&desc) &&
!desc->IsUndefined()) {
Environment* env = Environment::GetCurrent(context);
Local<Object> desc_obj = desc.As<Object>();

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13 changes: 13 additions & 0 deletions test/parallel/test-vm-set-proto-null-on-globalthis.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,13 @@
'use strict';
require('../common');

// Setting __proto__ on vm context's globalThis should not cause a crash
// Regression test for https://github.com/nodejs/node/issues/47798

const vm = require('vm');
const context = vm.createContext();

const contextGlobalThis = vm.runInContext('this', context);

// Should not crash.
contextGlobalThis.__proto__ = null; // eslint-disable-line no-proto