There are legitimate reasons to change the uid at runtime. For example, some server software starts as root and then drops to a less-privileged user. Android re

There are legitimate reasons to change the uid at runtime. For example, some server software starts as root and then drops to a less-privileged user. Android relies on this too, zygote, the fully-initialized "blank" runtime process, runs as root and gets forked and changes uid to the corresponding unprivileged user whenever an app is launched.