Re: [CFT][PATCH 6/7] userns: Add a knob to disable setgroups on a per user namespace basis

[Eric W. Biederman]

ebiederm@xxxxxxxxxxxx (Eric W. Biederman) writes:

> Andy Lutomirski <luto@xxxxxxxxxxxxxx> writes:
>
>>
>> This text was actually my suggested comment text.
>
> Now I see.
>
>> If you put smp_rmb() in this function with a comment like that, then I
>> think it will all make sense and be obviously correct (even with most
>> of the other barriers removed).
>
> Right.
>
> Given that we have to be careful when using these things anyway what
> I was hoping to achieve with the barriers appears impossible, and
> confusing so I will see about just adding barriers where we need them
> for real.  Sigh.

Doh.  The code has been entirely too clever.

There are no need for atomics or other cleverness, I just need to
generalize id_map_mutex.  I knew that had to be a trivially correct
way of handling this mess.

Eric
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