[PATCH v2] lsm, io_uring: add LSM hooks for the new uring_cmd file op

[Casey Schaufler]

On 8/10/2022 11:52 AM, Luis Chamberlain wrote:
> On Wed, Aug 10, 2022 at 02:39:54PM -0400, Paul Moore wrote:
>> On Wed, Aug 10, 2022 at 2:14 PM Luis Chamberlain <mcgrof at kernel.org> wrote:
>>> On Fri, Jul 15, 2022 at 01:28:35PM -0600, Jens Axboe wrote:
>>>> On 7/15/22 1:16 PM, Luis Chamberlain wrote:
>>>>> io-uring cmd support was added through ee692a21e9bf ("fs,io_uring:
>>>>> add infrastructure for uring-cmd"), this extended the struct
>>>>> file_operations to allow a new command which each subsystem can use
>>>>> to enable command passthrough. Add an LSM specific for the command
>>>>> passthrough which enables LSMs to inspect the command details.
>>>>>
>>>>> This was discussed long ago without no clear pointer for something
>>>>> conclusive, so this enables LSMs to at least reject this new file
>>>>> operation.
>>>> From an io_uring perspective, this looks fine to me. It may be easier if
>>>> I take this through my tree due to the moving of the files, or the
>>>> security side can do it but it'd have to then wait for merge window (and
>>>> post io_uring branch merge) to do so. Just let me know. If done outside
>>>> of my tree, feel free to add:
>>>>
>>>> Acked-by: Jens Axboe <axboe at kernel.dk>
>>> Paul, Casey, Jens,
>>>
>>> should this be picked up now that we're one week into the merge window?
>> Your timing is spot on!  I wrapped up a SELinux/SCTP issue by posting
>> the patches yesterday and started on the io_uring/CMD patches this
>> morning :)
>>
>> Give me a few days to get this finished, tested, etc. and I'll post a
>> patchset with your main patch, the Smack patch from Casey, the SELinux
>> patch, and the /dev/null patch so we can all give it a quick sanity
>> check before I merge it into the LSM/stable branch and send it to
>> Linus.  Does that sound okay?

It's taking a while to get a satisfactory test going for Smack,
but I should have something in a few days.

> Works with me! But just note I'll be away on vacation starting tomorrow
> in the woods looking for Bigfoot with my dog,

Bigfoot was sighted lounging on Chuckanut Rock a couple weeks ago.

>  so I won't be around. And
> I suspect Linus plans to release 6.0 on Sunday, if the phb-crystall-ball [0]
> is still as accurate.
>
> [0] http://deb.tandrin.de/phb-crystal-ball.htm
>
>   Luis