On Linux how can I change EUID of running process from command line (provided I have root access)?



I don't think you can, I am not aware of any syscall that lets you change the effective user id of any process but the calling process.


There's kchuid, but that requires you to compile your own kernel modules, was last updated in 2002, and looks extremely feary.

Alternatively, you could do probably do some ptrace hacks, but a sample or direction is bit beyond me.


Use gdb.

# gdb -p pid

(gdb) p seteuid(userid)

  • 1
    This requires that pid is running as root already - calls run via p run in the context of the traced process. – MikeyB Feb 1 '10 at 18:56

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