memcheck/tests/clo_redzone.c

   1 #include <inttypes.h>
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 int main()
   5 {
   6    __attribute__((unused)) char *p = malloc (1);
   7    char *b1 = malloc (128);
   8    char *b2 = malloc (128);
   9    fprintf (stderr, "b1 %#" PRIxPTR " b2 %#" PRIxPTR "\n",
  10                     (uintptr_t)b1, (uintptr_t)b2);
  11
  12    // Try to land in b2 from b1, causing no error
  13    // with the default redzone-size, but having
  14    // an error with a bigger redzone-size.
  15    // We need to choose a value which lands in b2
  16    // on 32 bits and 64 bits.
  17    b1[127 + 70] = 'a';
  18    return 0;
  19 }