It should be noted that with a UID larger than INT_MAX a lot of things will start to break, ext4 for example only supports 32bit UIDs, so you won't be able to chown any files as this UID (atleast my own experimentation seems to find this. NFSv4 allows it if you enable squashing/mapping of user ids).<p>Lots of other tools will likely break in similar and unpredictable ways if your UID becomes that high. Likely those ways are also a lot of fun.<p>Since you'd need to be a privileged user to begin with, this is on the same alarm level as "running sed with sudo allows you to edit /etc/sudoers and gain full sudo privilege".