kern.ngroups (non) setting ... new bounty ?

[Pawel Jakub Dawidek]

On Tue, Sep 25, 2007 at 09:51:06AM -0700, rsync.net wrote:
> 
> It has been impossible to change kern.ngroups - at least for several years
> now.  It was not fixed in either 5.x or 6.x :
> 
> http://lists.freebsd.org/pipermail/freebsd-bugs/2007-January/022140.html
> 
> It is seemingly a difficult problem:
> 
> http://www.atm.tut.fi/list-archive/freebsd-stable/msg09969.html   [1]
> 
> However it should be solved - we can't be the only ones out there trying
> to add a UID to more than 16 groups...
> 
> 
> -----
> 
> 
> The rsync.net code bounties have been fairly successful this year - two of
> the five projects have been completed, and the large "vmware 6 on FreeBSD"
> project is now underway.
> 
> We'd like to add a new bounty for this kern.ngroups issue.  We are posting
> to -hackers today to get some feedback on how long this will take and how
> much money might reasonably be expected to lure this work.
> 
> 
> --rsync.net Support
> 
> 
> 
> [1]  Is it indeed true that these programs are broken by not following
>      NGROUPS_MAX from syslimits.h?

I don't see how they can be broken. They may not see more than 16
groups, but they shouldn't blow up. The only possibility of bad usage I
see is something like this:

	gid_t gids[NGROUPS_MAX];
	int gidsetlen;

	gidsetlen = getgroups(0, NULL);
	getgroups(gidsetlen, gids);

But I guess the most common use is:

	gid_t gids[NGROUPS_MAX];
	int gidsetlen;

	gidsetlen = getgroups(NGROUPS_MAX, gids);

Binaries using the latter method should be just fine.
BTW. The latter method is what all utilities from the base system use.

-- 
Pawel Jakub Dawidek                       http://www.wheel.pl
pjd at FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!
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