| <html> |
| <!-- |
| |
| american fuzzy lop++ - <canvas> harness |
| ------------------------------------- |
| |
| Originally written by Michal Zalewski |
| |
| Copyright 2013, 2014 Google Inc. All rights reserved. |
| |
| Licensed under the Apache License, Version 2.0 (the "License"); |
| you may not use this file except in compliance with the License. |
| You may obtain a copy of the License at: |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| A simple harness for going through afl-generated test cases, rendering them in |
| the browser environment, and discovering the use of uninitialized memory and |
| similar bugs. This code led to the discovery of a fair number of library and |
| browser security bugs! |
| |
| The url_list[] array is a placeholder; for this to work properly, it needs to |
| be initialized with web-reachable paths to individual test cases. This can |
| be done manually or with a simple script. |
| |
| --> |
| |
| <body onload="set_images()"> |
| |
| <div id="status"></div> |
| |
| <div id="image_div"></div> |
| |
| <canvas height=64 width=64 id=cvs></canvas> |
| |
| <h2>Results</h2> |
| |
| <ul id="output"></ul> |
| |
| <script> |
| |
| var c = document.getElementById('cvs'); |
| var ctx = c.getContext('2d'); |
| |
| var url_list = [ |
| "images/id:000000,[...].jpg", |
| "images/id:000001,[...].jpg", |
| /* ... */ |
| null |
| ]; |
| |
| var USE_IMAGES = 50; |
| var cur_image = 0; |
| |
| if (location.hash) cur_image = parseInt(location.hash.substr(1)); |
| |
| var loaded = 0; |
| var image_obj = []; |
| |
| var msie_cleanup; |
| |
| function check_results() { |
| |
| var uniques = []; |
| |
| clearTimeout(msie_cleanup); |
| |
| ctx.clearRect(0, 0, 64, 64); |
| |
| uniques.push(image_obj[0].imgdata); |
| |
| for (var i = 1; i < USE_IMAGES; i++) { |
| |
| if (!image_obj[i].imgdata) continue; |
| |
| if (image_obj[0].imgdata != image_obj[i].imgdata) { |
| |
| for (var j = 1; j < uniques.length; j++) |
| if (uniques[j] == image_obj[i].imgdata) break; |
| |
| if (j == uniques.length) uniques.push(image_obj[i].imgdata); |
| |
| |
| } |
| |
| } |
| |
| if (uniques.length > 1) { |
| |
| var str = '<li> Image ' + url_list[cur_image] + ' has ' + uniques.length + ' variants: '; |
| |
| for (var i = 0; i < uniques.length; i++) |
| str += '<img src="' + uniques[i] + '">'; |
| |
| document.getElementById('output').innerHTML += str; |
| |
| } |
| |
| cur_image++; |
| set_images(); |
| } |
| |
| |
| function count_image() { |
| |
| if (!this.complete || this.counted) return; |
| |
| this.counted = true; |
| |
| loaded++; |
| |
| ctx.clearRect(0, 0, 64, 64); |
| |
| try { |
| ctx.drawImage(this, 0, 0, 64, 64); |
| } catch (e) { } |
| |
| this.imgdata = c.toDataURL(); |
| |
| if (loaded == USE_IMAGES) check_results(); |
| } |
| |
| |
| function set_images() { |
| |
| loaded = 0; |
| |
| document.getElementById('status').innerHTML = 'Now processing ' + cur_image + '...'; |
| location.hash = '#' + cur_image; |
| |
| if (url_list[cur_image] == null) { |
| alert('Done!'); |
| return; |
| } |
| |
| restart_images(); |
| |
| msie_cleanup = setTimeout(check_results, 5000); |
| |
| for (var i = 0; i < USE_IMAGES; i++) |
| image_obj[i].src = url_list[cur_image] + '?' + Math.random(); |
| |
| } |
| |
| |
| function restart_images() { |
| |
| for (var i = 0; i < USE_IMAGES; i++) |
| if (image_obj[i]) image_obj[i].counted = true; |
| |
| document.getElementById('image_div').innerHTML = ''; |
| image_obj = []; |
| |
| for (var i = 0; i < USE_IMAGES; i++) { |
| |
| image_obj[i] = new Image(); |
| image_obj[i].height = 64; |
| image_obj[i].width = 64; |
| image_obj[i].onerror = count_image; |
| image_obj[i].onload = count_image; |
| |
| document.getElementById('image_div').appendChild(image_obj[i]); |
| |
| } |
| |
| } |
| |
| </script> |
| |
| <iframe src='http://www.cnn.com/'></iframe> |
