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Code Issues Releases Wiki Activity

Protect webmaker users from INFINITE LOOPS! fixes #18

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This commit is contained in:
Kushagra Gour
2016-11-14 12:41:59 +05:30
parent 25f5674bf4
commit 8a82a24c7d
3 changed files with 66 additions and 7 deletions
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1
src/index.html
View File

@ -676,6 +676,7 @@
<script src="lib/split.js"></script>
<script src="lib/esprima.js"></script>
<script src="lib/escodegen.browser.min.js"></script>
<script src="utils.js"></script>
<script src="deferred.js"></script>

22
src/script.js
View File

@ -334,16 +334,18 @@
var code = editur.cm.js.getValue();
cleanupErrors('js');
var ast;
if (jsMode === JsModes.JS) {
try {
esprima.parse(code, {
ast = esprima.parse(code, {
tolerant: true
});
} catch(e) {
showErrors('js', [ { lineNumber: e.lineNumber-1, message: e.description } ]);
} finally {
d.resolve(code);
utils.addInfiniteLoopProtection(ast);
d.resolve(escodegen.generate(ast));
}
} else if (jsMode === JsModes.COFFEESCRIPT) {
var coffeeCode;
@ -352,23 +354,31 @@
} catch (e) {
showErrors('js', [ { lineNumber: e.location.first_line, message: e.message } ]);
} finally {
d.resolve(coffeeCode);
ast = esprima.parse(coffeeCode, {
tolerant: true
});
utils.addInfiniteLoopProtection(ast);
d.resolve(escodegen.generate(ast));
}
} else if (jsMode === JsModes.ES6) {
try {
esprima.parse(code, {
ast = esprima.parse(code, {
tolerant: true
});
} catch(e) {
showErrors('js', [ { lineNumber: e.lineNumber-1, message: e.description } ]);
} finally {
d.resolve(Babel.transform(code, { presets: ['es2015'] }).code);
utils.addInfiniteLoopProtection(ast);
d.resolve(Babel.transform(escodegen.generate(ast), { presets: ['es2015'] }).code);
}
}
return d.promise;
}
window.previewException = function (error) {
console.error('Possible infinite loop detected.', error.stack)
}
window.onunload = function () {
saveCode('code');
};
@ -391,7 +401,7 @@
var contents = '<html>\n<head>\n' +
'<style>\n' + css + '\n</style>\n' +
'</head>\n' +
'<body>\n' + html + '\n<script>\n' + js + '\n</script></body>\n</html>';
'<body>\n' + html + '\n<script>\n' + js + '\n//# sourceURL=userscript.js</script></body>\n</html>';
var fileWritten = false;

50
src/utils.js
View File

@ -1,6 +1,7 @@
(function () {
window.$ = document.querySelector.bind(document);
window.$all = document.querySelectorAll.bind(document);
var alphaNum = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
// https://github.com/substack/semver-compare/blob/master/index.js
function semverCompare(a, b) {
@ -21,7 +22,7 @@
len = len || 10;
var id = '';
for (var i = len; i--;) {
id += String.fromCharCode(~~(Math.random() * 52) + 65);
id += alphaNum[~~(Math.random() * alphaNum.length)];
}
return id;
}
@ -39,10 +40,57 @@
}
}
// Generate 2 ASTs for the code to be inserted in loops for infinite run protection.
// The `myVar` variable names would be changed later for every insertion.
function getLoopProtectorBlocks() {
var ast1 = esprima.parse('var myvar = Date.now();');
var ast2 = esprima.parse('while(a){if (Date.now() - a787897 > 1000) { window.top.previewException(new Error("Infinite loop")); break;}}');
return {
before: ast1.body[0],
inside: ast2.body[0].body.body[0]
}
}
/**
* Add timed limit on the loops found in the passed AST body
* @param {ASTBody} Body of an AST generated by esprima or any ES compliant AST
*/
function addInfiniteLoopProtection(astBody) {
if (!Array.isArray(astBody)) {
addInfiniteLoopProtection(astBody.body);
return;
}
var el, randomVariableName, insertionBLocks;
for (var i = astBody.length; i--;) {
el = astBody[i];
if (el && el.type === 'ForStatement' || el.type === 'WhileStatement' || el.type === 'DoWhileStatement') {
randomVariableName = '_' + generateRandomId(3);
insertionBLocks = getLoopProtectorBlocks();
insertionBLocks.before.declarations[0].id.name = insertionBLocks.inside.test.left.right.name = randomVariableName;
// Insert time variable assignment
astBody.splice(i, 0, insertionBLocks.before);
// If the loop's body is a single statement, then convert it into a block statement
// so that we can insert our conditional break inside it.
if (!Array.isArray(el.body)) {
el.body = {
body: [ el.body ],
type: 'BlockStatement'
};
}
// Insert IfStatement
el.body.body.unshift(insertionBLocks.inside);
}
if (el.body) {
addInfiniteLoopProtection(el.body);
}
}
}
window.utils = {
semverCompare: semverCompare,
generateRandomId: generateRandomId,
onButtonClick: onButtonClick,
addInfiniteLoopProtection: addInfiniteLoopProtection,
log: log
};
})();