堆、代码段：按页随机化，最后1.5字节不变

栈：不按页随机化

sudo sysctl -w kernel.randomize_va_space=0 # 关闭aslr
sudo sysctl -w kernel.randomize_va_space=2 # 开启aslr
set disable-randomization off # gdb中开启aslr