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

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Linux Kernel]     [Kernel Development Newbies]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite Hiking]     [Linux Kernel]     [Linux SCSI]