infer_clone/infer/tests/codetoanalyze/cpp/quandary/arrays.cpp

/*
 * Copyright (c) 2017 - present Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

#include <array>
#include <string>

extern int __infer_taint_source();
extern void skip(int i, int j);

namespace arrays {

void array_sink1_bad(int arr[]) {
  int source = __infer_taint_source();
  arr[source] = 2;
}

int array_sink2_bad(int arr[]) {
  int source = __infer_taint_source();
  return arr[source];
}

int array_sink3_bad(int arr[]) { return arr[1 + __infer_taint_source()]; }

void array_sink4_bad(int arr[]) {
  int source = __infer_taint_source();
  skip(1, arr[source]);
}

void std_array_sink_bad(std::array<int, 2> arr) {
  int source = __infer_taint_source();
  arr[source] = 2;
}

void std_string_sink_bad(std::string str) {
  int source = __infer_taint_source();
  str[source] = 'a';
}

int stack_smash_bad() {
  int source = __infer_taint_source();
  int arr[source];
  return arr[0]; // could read from anywhere in the stack
}

// these examples used to crash the HIL conversion
char index_of_literal_ok1() { return "foo"[1]; }

char index_of_literal_ok2() { return "foo"[7]; }

char index_of_literal_ok3(int i) { return "foo"[i]; }
}