compiler-rt/test/asan/TestCases/invalid-pointer-pairs-compare-success.cpp

   1 // RUN: %clangxx_asan -O0 %s -o %t -mllvm -asan-detect-invalid-pointer-pair
   2
   3 // RUN: %env_asan_opts=detect_invalid_pointer_pairs=2 %run %t
   4
   5 #include <assert.h>
   6 #include <stdlib.h>
   7
   8 int foo(char *p) {
   9   char *p2 = p + 20;
  10   return p > p2;
  11 }
  12
  13 int bar(char *p, char *q) {
  14   return p <= q;
  15 }
  16
  17 int baz(char *p, char *q) {
  18   return p != 0 && p < q;
  19 }
  20
  21 char global[8192] = {};
  22 char small_global[7] = {};
  23
  24 int main() {
  25   // Heap allocated memory.
  26   char *p = (char *)malloc(42);
  27   int r = foo(p);
  28   free(p);
  29
  30   p = (char *)malloc(1024);
  31   bar(p, p + 1024);
  32   bar(p + 1024, p + 1023);
  33   bar(p + 1, p + 1023);
  34   free(p);
  35
  36   p = (char *)malloc(4096);
  37   bar(p, p + 4096);
  38   bar(p + 10, p + 100);
  39   bar(p + 1024, p + 4096);
  40   bar(p + 4095, p + 4096);
  41   bar(p + 4095, p + 4094);
  42   bar(p + 100, p + 4096);
  43   bar(p + 100, p + 4094);
  44   free(p);
  45
  46   // Global variable.
  47   bar(&global[0], &global[1]);
  48   bar(&global[1], &global[2]);
  49   bar(&global[2], &global[1]);
  50   bar(&global[0], &global[100]);
  51   bar(&global[1000], &global[7000]);
  52   bar(&global[500], &global[10]);
  53   p = &global[0];
  54   bar(p, p + 8192);
  55   p = &global[8000];
  56   bar(p, p + 192);
  57
  58   p = &small_global[0];
  59   bar(p, p + 1);
  60   bar(p, p + 7);
  61   bar(p + 7, p + 1);
  62   bar(p + 6, p + 7);
  63   bar(p + 7, p + 7);
  64
  65   // Stack variable.
  66   char stack[10000];
  67   bar(&stack[0], &stack[100]);
  68   bar(&stack[1000], &stack[9000]);
  69   bar(&stack[500], &stack[10]);
  70
  71   baz(0, &stack[10]);
  72
  73   return 0;
  74 }