[REVIEW][PATCH 09/11] ipc/shm: Fix shmctl(..., IPC_STAT, ...) between pid namespaces.

[Eric W. Biederman]

NAGARATHNAM MUTHUSAMY <nagarathnam.muthusamy at oracle.com> writes:

> On 3/23/2018 2:33 PM, ebiederm at xmission.com wrote:
>> NAGARATHNAM MUTHUSAMY <nagarathnam.muthusamy at oracle.com> writes:
>>
>>> Thanks!
>>>
>>> Reviewed-by: Nagarathnam Muthusamy <nagarathnam.muthusamy at oracle.com>
>> Does this look like it will address the issue you have been fighting
>> with pids?
>
> We do use IPC shared memory but it is a single large one, shared by multiple
> levels. We are currently looking into using a similar solution based on file
> locks.
> When a new level is created, a file representing that level could be created in
> a common path which could be locked by the init process of that level.
> Parent levels could query the locking pid of that file to get the pid
> translation
> of the init process of the required level. Then it could open a file descriptor
> and use the translate_pid API for further translations.

Do you want to resend the translate_pid API with file descriptors as it
was in the lwn article?  That I will apply.

Eric
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