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

Thanks

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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.

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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.

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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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