tor-browser

The Tor Browser
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binaryarith-date-valueOf-pollution.js (2846B)

      1 function warmup(fun, input_array) {
      2  for (var index = 0; index < input_array.length; index++) {
      3      input = input_array[index];
      4      input_lhs = input[0];
      5      input_rhs = input[1];
      6      output    = input[2];
      7      for (var i = 0; i < 30; i++) {
      8          var y = fun(input_lhs, input_rhs);
      9          assertEq(y, output)
     10      }
     11  }
     12 }
     13 
     14 {
     15  // Check that changing the valueOf function of Date.prototype does not affect the inlined Date subtraction.
     16  const testCases = [[new Date("2024-09-20T19:54:27.432Z"), new Date("2024-09-20T19:54:27.427Z"), 5],
     17                 [new Date("2024-09-20T19:54:27.432Z"), 1726862067427, 5],
     18                 [1726862067427, new Date("2024-09-20T19:54:27.432Z"), -5]];
     19  const funDateSub = (a, b) => { return a - b; }
     20  warmup(funDateSub, testCases);
     21 
     22  const originalDateValueOf = Date.prototype.valueOf;
     23  let counter = 0;
     24  Date.prototype.valueOf = function() {
     25    counter++;
     26    return originalDateValueOf.call(this);
     27  }
     28 
     29  assertEq(funDateSub(new Date("2024-09-20T19:54:27.432Z"), new Date("2024-09-20T19:54:27.422Z")), 10);
     30  assertEq(counter, 2);
     31 }
     32 
     33 {
     34  // Check that a pre-existing Date.prototype.valueOf override does not affect the inlined Date subtraction.
     35  let counter = 0;
     36  const originalDateValueOf = Date.prototype.valueOf;
     37  Date.prototype.valueOf = function() {
     38    counter++;
     39    return originalDateValueOf.call(this);
     40  }
     41 
     42  const funDateSub = (a, b) => { return a - b; }
     43  assertEq(funDateSub(new Date("2024-09-20T19:54:27.432Z"), new Date("2024-09-20T19:54:27.422Z")), 10);
     44  assertEq(counter, 2);
     45 
     46  const testCases = [[new Date("2024-09-20T19:54:27.432Z"), new Date("2024-09-20T19:54:27.427Z"), 5],
     47                 [new Date("2024-09-20T19:54:27.432Z"), 1726862067427, 5],
     48                 [1726862067427, new Date("2024-09-20T19:54:27.432Z"), -5]];
     49  warmup(funDateSub, testCases);
     50  counter = 0;
     51 
     52  assertEq(funDateSub(new Date("2024-09-20T19:54:27.432Z"), new Date("2024-09-20T19:54:27.422Z")), 10);
     53  assertEq(funDateSub(new Date("2024-09-20T19:54:27.432Z"), 1726862067427), 5);
     54  assertEq(counter, 3);
     55 }
     56 
     57 {
     58  // Check that using extended date classes does not affect the inlined Date subtraction.
     59  const testCases = [[new Date("2024-09-20T19:54:27.432Z"), new Date("2024-09-20T19:54:27.427Z"), 5],
     60                 [new Date("2024-09-20T19:54:27.432Z"), 1726862067427, 5],
     61                 [1726862067427, new Date("2024-09-20T19:54:27.432Z"), -5]];
     62  const funDateSub = (a, b) => { return a - b; }
     63  warmup(funDateSub, testCases);
     64 
     65  let counter = 0;
     66  class MyDate extends Date {
     67    valueOf() {
     68      counter++;
     69      return super.valueOf();
     70    }
     71  }
     72 
     73  assertEq(funDateSub(new MyDate("2024-09-20T19:54:27.432Z"), new MyDate("2024-09-20T19:54:27.422Z")), 10);
     74  assertEq(funDateSub(1726862067427, new MyDate("2024-09-20T19:54:27.432Z")), -5);
     75  assertEq(counter, 3);
     76 }