unsigned int get_interesting_32bit_value(void)
{
unsigned int num = 0;
switch (rand() % 10) {
case 0: num = 0x00000000;
break;
case 1: num = rand() % 256; // 00-0xff
break;
case 2: num = 1 << (rand() % 32); // set a single bit.
break;
case 3: num = 0x8fffffff;
break;
case 4: num = 0xff;
num = num << (rand() % 31);
break;
case 5: num = 0xffff0000;
break;
case 6: num = 0xffffe000;
break;
case 7: num = 0xffffff00 | (rand() % 256);
break;
case 8: num = 0xffffffff - page_size;
break;
case 9: num = 0xffffffff;
break;
}
num = plus_minus_two(num);
return num;
}
unsigned long get_interesting_value(void)
{
unsigned long low = 0;
switch (rand() % 3) {
case 0: low = get_interesting_8bit_value();
break;
case 1: low = get_interesting_16bit_value();
break;
case 2: low = get_interesting_32bit_value();
break;
}
low = (rand() & 0xf) ? low : plus_minus_two(low); // 1 in 16 call plus_minus_two
#if __WORDSIZE != 32
if (RAND_BOOL()) { // FIXME: This should likely be less aggressive than 50/50
switch (rand() % 11) {
case 0: return 0x0000000100000000UL | low;
case 1: return 0x7fffffff00000000UL | low;
case 2: return 0x8000000000000000UL | low;
case 3: return 0xffffffff00000000UL | low;
case 4: return 0xffffffffffffff00UL | RAND_BYTE();
case 5: return 0xffffffffffffffffUL - page_size;
case 6: return PAGE_OFFSET | (low << 4);
case 7: return KERNEL_ADDR | (low & 0xffffff);
case 8: return MODULE_ADDR | (low & 0xffffff);
case 9: return per_arch_interesting_addr(low);
case 10: return (low << 32);
}
}
#endif /* __WORDSIZE */
return low;
}
