From owner-freebsd-isp  Wed May 26 20:22:16 1999
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Date: Wed, 26 May 1999 22:18:48 -0500 (EST)
From: Steve Ames <steve@cioe.com>
Message-Id: <199905270318.WAA92247@ns1.cioe.com>
To: ayan@kiwi.datasys.net, freebsd-isp@freebsd.org, steve@cioe.com
Subject: Re: UID Limits
Cc: freebsd-hackers@freebsd.org
In-Reply-To: <199905261252.IAA10076@kiwi.datasys.net>
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Dunno. The IPC code uses ushrt as the type for uid... couldn't
find anything else that does. Is this vestigial?

I'm CC-ing this to 'freebsd-hackers' since I think we're outside
the pervue of 'freebsd-isp' at this point...

The question is "What is the maximum UID?". Its either a 2 or 4
byte unsigned integer. The filesystem seems to accept 4, pwd_mkdb
complains about larger than 2 but lets you do it...

						-Steve

> Yes, pwd_mkdb compares the UID with USHRT_MAX.  I wonder if there
> is a macro that defines the maximum GID and UID like:
>
> 	#define UID_MAX		UINT_MAX;
> 	#define GID_MAX		UINT_MAX;
>
> I couldn't find it anywhere in the source but if there is one out
> there, I imagine pwd_mkdb should use it.
>
> [ Quoted message from Steve Ames, recieved May 26,  5:56am.]
>
> > 
> > Yeah, I just didn't know. I fired up 'vipw' and just changed a UID
> > to an arbitraily large number and vipw returned thustly:
> > 
> > vipw: rebuilding the database...
> > pwd_mkdb: 1011045 > max uid value (65535)
> > 
> > However it took it. I can chown a file over and it appears to work
> > correclty. I can then remove the user from the password database
> > and look at the file on the system with 'ls':
> > 
> > -rw-r--r--   1 1011045  wheel        0 May 26 05:52 i
> > 
> > So the filesystem is ok with it... so other than one warning 
> > message in 'pwd_mkdb' it seems to be that you can have more than
> > 65535...
> > 
> > Am I missing something dangerous here?
> > 
> > 						-Steve
> >
>
> [ End message from Steve Ames. ]
>


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