root privileges

Jorge Marques Pelizzoni jpeliz@icmc.usp.br
Fri Nov 30 01:09:00 GMT 2007


First of all, please believe that I spent almost three hours going through
the mailing list archives before asking this. It's just that I (and many
others) have not been able to find a solution there.

I'm not running a program that tests for rootness in some non-portable
way. I'm just calling an innocent ioctl directly into cygwin, which tells
me I need more permissions. Just for clarification, here is the problem
code:

ioctl(fd,TIOCMGET,&status);
status &= ~TIOCM_RTS;
ioctl(fd, TIOCMSET, &status); // returns -EPERM

Apart from having a privileged (administrator) windows account, should I
understand (from http://cygwin.com/cygwin-ug-net/ntsec.html) that all
cygwin asks for is that I should get things right in /etc/passwd and
/etc/group?

Please take a look at what I've tried so far:

in /etc/passwd:

  (original)
jorge:*:1008:513:Jorge,U-QUICKSILVER\jorge,S-1-5-21-1450639292-781126914-3756273746-1008:/home/jorge:/bin/bash
  (1st try) 
jorge:*:1008:544:Jorge,U-QUICKSILVER\jorge,S-1-5-21-1450639292-781126914-3756273746-1008:/home/jorge:/bin/bash
  (2nd try) 
jorge:*:100:0:Jorge,U-QUICKSILVER\jorge,S-1-5-21-1450639292-781126914-3756273746-1008:/home/jorge:/bin/bash
  (3rd try) 
jorge:*:0:0:Jorge,U-QUICKSILVER\jorge,S-1-5-21-1450639292-781126914-3756273746-1008:/home/jorge:/bin/bash

in /etc/group (for the 2nd and 3rd tries above, I added the following line):
  root:S-1-5-32-544:0:

Finally, I even tried running the program from a "SYSTEM-owned shell", to
no avail.

Thanks in advance for any pointers. Cheers,

Jorge.

Jorge Marques Pelizzoni escreveu:
>
> Hi all!
>
> I am developing a program that requires root privileges to run (e.g. it
> calls ioctl to set communication lines at a serial port). Even though I am
> an administrator of my WinXP workstation, cygwin keeps giving me EPERM.
> Ok, I've read:
>
> http://cygwin.com/cygwin-ug-net/ntsec.html#ntsec-mapping
>
> but wasn't able to sove my problem anyway. I even tried changing my user
> group from 513 to 544 in /dev/passwd by directly editing this file...
>
> I'd rather not change the program (as it runs fine on linux) but just be
> recognized as root to have it going on Windows. Is that possible?
>
> Thanks in advance. Cheers,
>
> Jorge.
>
>



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