Re: LOGNAME, USER, and get-uid; NIS Lassi Kortela 13 Aug 2019 11:33 UTC
> Sorry if I wasn't clear, I only did one set-uid, and it indeed > changed the effective uid to 1000. The problem is that the real > uid [...] also changed to 1000. The setuid() function sets the real and effective user IDs and the saved set-user-ID of the current process to the specified value. There's a separate seteuid() syscall (note the "e") to set only the effective user ID. Ditto for setgid() and setegid().