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SubjectRe: RFC: Dynamic group limit
Hi Mattias.

>> If you are talking about dynamic sizing of the number of maximum
>> groups per user what do you do if you resize it smaller but
>> there are already structures that contain more than your new
>> size? IOW, say the existing ngroups_max is 64 and you have a
>> couple of users logged in that have 50, 10, and 27 groups in
>> their groups_struct. What would happen if you resized
>> ngroups_max to 32?

> This is a good question, I see three two to tackle this:

> 1. Lower the limit and just give EFAULT for all new setgroups()
> calls.

> 2. Do not allow the limits for the kernel/ngroup_max paramter to
> be set lower than the maximum number of groups i any task.

3. Do not allow this limit to be lowered.

> Both has problem with the fact that an application can have been
> asking for the max and that max has changed :-(...

> I personaly wote for the second approch, but I do not think that
> this parameter should be changed too often. The main purpose for
> it that I can think of for the moment is a default (but runtime
> changeable) limit of 32 groups until enough programs has been
> tested/fixed for more than 32 groups.

I would personally vote for the third approach.

Best wishes from Riley.

+----------------------------------------------------------------------+
| There is something frustrating about the quality and speed of Linux |
| development, ie., the quality is too high and the speed is too high, |
| in other words, I can implement this XXXX feature, but I bet someone |
| else has already done so and is just about to release their patch. |
+----------------------------------------------------------------------+
* ftp://ftp.MemAlpha.cx/pub/rhw/Linux
* http://www.MemAlpha.cx/kernel.versions.html


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