Re: [PATCH v17 05/10] fs,landlock: Support filesystem access-control

Mickaël Salaün
2020-05-14T18:49:31Z

On 14/05/2020 19:31, James Morris wrote:
> On Thu, 14 May 2020, Mickaël Salaün wrote:
>
>>> This needs to be converted to the LSM API via superblock blob stacking.
>>>
>>> See Casey's old patch:
>>> https://lore.kernel.org/linux-security-module/20190829232935.7099-2-casey@schaufler-ca.com/
>>
>> s_landlock_inode_refs is quite similar to s_fsnotify_inode_refs, but I
>> can do it once the superblock security blob patch is upstream. Is it a
>> blocker for now? What is the current status of lbs_superblock?
>
> Yes it is a blocker. Landlock should not be adding its own functions in
> core code, it should be using the LSM API (and extending that as needed).

OK, I'll use that in the next series.

>
>> Anyway, we also need to have a call to landlock_release_inodes() in
>> generic_shutdown_super(), which does not fit the LSM framework, and I
>> think it is not an issue. Landlock handling of inodes is quite similar
>> to fsnotify.
>
> fsnotify is not an LSM.

Yes, so I'll need to add a new LSM hook for this (release) call, right?