linux/x86 ifreadfd,buf,512<=2 _exit1 else buf; 29 bytes

linux/x86 ifreadfd,buf,512 I made this as a chunk you can paste in to make modular remote exploits. I use it as a first stage payload when I desire to follow up with a real large payload of goodness. This actually is a bit larger than necessary because of the error checking but in some cases...