Re: Use cases for multiple uid mapping?

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On Fri, Aug 28, 2020 at 10:17:16AM -0500, Eric W. Biederman wrote:
> 
> We had a discussion in the hackroom at LPC talking about use cases for
> a shiftfs style setup where there are different mappings of uids to
> disk.
> 
> In the discussion we had a couple of ideas of kernel developments
> we should look at that address some of these.
> 
> - Fix rlimits in user namespaces (This potentially allows multiple
>   containers to run with the same userids simplifying the mapping
>   problem).
> 
> - Look at extending kuid_t to 64bits and using the highbits to
>   implement uids that are private to user namespaces and don't
>   map out.
>   
> - Look at ways for allowing setgroups unprivileged.
> 
> 
> Together this has the potential that the existing uid & gid mappings
> will be able to function the same as the proposed fusid mappings. Fingers crossed.
> 
> 
> I had some problems with audio and a lot of people were talking
> quickly.  So I did not manage to capture everyone's use cases.   And I
> definitely was not able to see how everyone's use cases interacted with
> the changes we are looking at.
> 
> I know for certain I missed Serge's usecase (apologies).
> 
> Can people follow up to this and report their use cases?

Sorry - I'll do so later this week.

> There are some real challenges and I would like to see if we
> can solve them, while avoiding scary problems like changing
> uids on write.
> 
> Eric
> 
> 
> 
> 
> 
> 
> 
>   
> 
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