Re: mkpasswd and uid problem with domain accounts (16-bit wrapping?)

[Igor Pechtchanski <pechtcha at cs dot nyu dot edu>]

On Tue, 27 May 2003, Reddie, Steven wrote:

> I'm having problems with uid's which I think is due to 16-bit wrapping.
> I was recently transferred to a different domain and so ran "mkpasswd -d
> -u myusername newdomain" and got back an entry with a uid=133500 due to
> the tailing end of the SID being 123500.  I added this line to
> /etc/passwd.  My id get's reported as 2428 and it doesn't resolve to my
> username.  It seems that the value is wrapped to 16-bits.  If I change
> the uid value in /etc/passwd to 2428 everything seems to work.  I had
> some difficulty determining this at first and was wondering if it's
> expected or a bug.  The domain that I am now on would have well over
> 20,000 accounts and maybe far more, so this is why the uid is calculated
> as such a high value.  Does anyone have any further info?
>
> Regards,
> Steven

Steven,

This is exactly what happened; it's expected and is perfectly fine.
Cygwin UIDs are currently 16-bit.  Thankfully, you don't have to have your
Cygwin UID correspond in any way to your Windows SID -- it simply has to
be unique.  So, just change the UID to something (2428 works as well as
anything else, just make sure that you don't have another user with this
UID).  FYI, Cygwin 1.5 should have 32-bit UIDs.
	Igor
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