ID Numbering in Group and Passwd
Robin.Laing at drdc-rddc.gc.ca
Wed Nov 30 15:58:13 UTC 2005
Dave Brown wrote:
> I have had a look at the RFE you filed and to be honest i disagree with
> the way you have asked for it to be fixed. By selecting the GIDs in
> decending order from 60,000 down and the uid ascending from 500 there
> still exists the possibility for these 2 numbers to collide if you have
> more than 59500 users / groups. Granted this is a large number but for
> big institutions / companies this isnt unreasonable. I personally have
> worked with two installations that this numbering scheme would have
> caused problems.
> I believe that the underlying code should be changed so that when adding
> a user the lowest available number which is not currently used by either
> a group or user should be the one selected. That way you can have as
> many users as you want (up to 2^32 of course :o) without running into
> any clashes.
> I will add a note to your RFE explaining my thoughts and see what RedHat
> reckon. Thanks for your input.
> On 26/11/05, *Robin Laing * <Robin.Laing at drdc-rddc.gc.ca
> <mailto:Robin.Laing at drdc-rddc.gc.ca>> wrote:
> Kanwar Ranbir Sandhu wrote:
> > On Thu, 2005-24-11 at 09:31 +0000, Dave Brown wrote:
> >>Robin / Others - what do you think? Depending on the general
> >>I'll probably submit a feature enhancement request.
> > If you do enter a RFE, can you send a reply to this thread with
> > #? I'd like to watch it since I've recently run into this problem -
> > it's a major pain in the ass.
> > Regards,
> > Ranbir
> I entered an RFE this afternoon.
> Bug 174205
Some times I am not that good at explaining things.
I have added to the RFE taking your comments into account as you will
see. I am reposting some of my comments here for the list.
I used 60,00 as an arbitrary number. If Fedora can work with 2^32
GID's then change 60,000 to 2^32 and work from there. It isn't a big
The idea is to search from high to low for GID's and low to high for
This also minimizes any holes in the UID/GID mix unless users are deleted.
Thanks for the suggestion.
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