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🐛 createElement hijack must be paired to avoid rewriting leak (#2777)

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Kuitos 2023-11-02 21:13:16 +08:00 committed by GitHub
parent 46e492156e
commit a38b1af97f
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1 changed files with 24 additions and 3 deletions
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27
src/sandbox/patchers/dynamicAppend/forStrictSandbox.ts
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@ -59,16 +59,37 @@ function patchDocument(cfg: { sandbox: SandBox; speedy: boolean }) {
};
if (speedy) {
const modifications: {
createElement?: typeof document.createElement;
querySelector?: typeof document.querySelector;
} = {};
const proxyDocument = new Proxy(document, {
/**
* Read and write must be paired, otherwise the write operation will leak to the global
*/
set: (target, p, value) => {
(<any>target)[p] = value;
switch (p) {
case 'createElement': {
modifications.createElement = value;
break;
}
case 'querySelector': {
modifications.querySelector = value;
break;
}
default:
(<any>target)[p] = value;
break;
}
return true;
},
get: (target, p, receiver) => {
switch (p) {
case 'createElement': {
// Must store the original createElement function to avoid error in nested sandbox
const targetCreateElement = target.createElement;
const targetCreateElement = modifications.createElement || target.createElement;
return function createElement(...args: Parameters<typeof document.createElement>) {
if (!nativeGlobal.__currentLockingSandbox__) {
nativeGlobal.__currentLockingSandbox__ = sandbox.name;
@ -87,7 +108,7 @@ function patchDocument(cfg: { sandbox: SandBox; speedy: boolean }) {
}
case 'querySelector': {
const targetQuerySelector = target.querySelector;
const targetQuerySelector = modifications.querySelector || target.querySelector;
return function querySelector(...args: Parameters<typeof document.querySelector>) {
const selector = args[0];
switch (selector) {