[PATCH v4] vfs, security: Fix automount superblock LSM init problem, preventing NFS sb sharing

[Casey Schaufler]

On 8/30/2022 1:49 AM, David Howells wrote:
> Casey Schaufler <casey at schaufler-ca.com> wrote:
>
>> The authors of this version of the mount code failed to look
>> especially closely at how Smack maintains label names. Once a
>> label name is used in the kernel it is kept on a list forever.
>> All the copies of smk_known here and in the rest of the mount
>> infrastructure are unnecessary and wasteful. The entire set of
>> Smack hooks that deal with mounting need to be reworked to remove
>> that waste. It's on my list of Smack cleanups, but I'd be happy
>> if someone else wanted a go at it.
> I don't have time to overhaul Smack right now.  Should I drop the Smack part
> of the patch?

No. I appreciate that you're including Smack as part of the effort.
I would much rather have the code working as you have it than have
to go in later and do it all from scratch. With luck I should be able
to get someone with a considerably lower level of expertise to work
on it.

> David