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LibJS: Guard against stack overflow in ProxyObject has_property()

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If proxy has an undefined trap, it will fallback to target's
internal_has_property, which will then check target's prototype for
the requested property. If Proxy's prototype is set to the Proxy itself,
it will check in itself in a loop, causing a stack overflow.
This commit is contained in:
Maciej 2023-05-04 14:32:37 +02:00 • committed by Tim Flynn
parent e7502d4d6d
commit 52a5a42147
2 changed files with 30 additions and 0 deletions
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17
Userland/Libraries/LibJS/Tests/builtins/Proxy/Proxy.handler-has.js
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@ -85,3 +85,20 @@ describe("[[Has]] invariants", () => {
);
});
});
test("Proxy handler that has the Proxy itself as its prototype", () => {
const handler = {};
const proxy = new Proxy({}, handler);
handler.__proto__ = proxy;
expect(() => {
"foo" in proxy;
}).toThrowWithMessage(InternalError, "Call stack size limit exceeded");
});
test("Proxy that has the Proxy itself as its prototype", () => {
const proxy = new Proxy({}, {});
proxy.__proto__ = Object.create(proxy);
expect(() => {
"foo" in proxy;
}).toThrowWithMessage(InternalError, "Call stack size limit exceeded");
});