linux-kernel - Re: [PATCH -next 0/2] lsm: Change inode

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Date:   Tue, 30 May 2023 07:55:17 -0700
From:   Casey Schaufler <casey@...aufler-ca.com>
To:     Christoph Hellwig <hch@....de>,
        Christian Brauner <brauner@...nel.org>
Cc:     Mickaël Salaün <mic@...ikod.net>,
        Xiu Jianfeng <xiujianfeng@...wei.com>,
        gregkh@...uxfoundation.org, rafael@...nel.org,
        viro@...iv.linux.org.uk, dhowells@...hat.com, code@...icks.com,
        hirofumi@...l.parknet.co.jp, linkinjeon@...nel.org,
        sfrench@...ba.org, senozhatsky@...omium.org, tom@...pey.com,
        chuck.lever@...cle.com, jlayton@...nel.org, miklos@...redi.hu,
        paul@...l-moore.com, jmorris@...ei.org, serge@...lyn.com,
        stephen.smalley.work@...il.com, eparis@...isplace.org,
        dchinner@...hat.com, john.johansen@...onical.com,
        mcgrof@...nel.org, mortonm@...omium.org, fred@...udflare.com,
        mpe@...erman.id.au, nathanl@...ux.ibm.com, gnoack3000@...il.com,
        roberto.sassu@...wei.com, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-cachefs@...hat.com,
        ecryptfs@...r.kernel.org, linux-cifs@...r.kernel.org,
        linux-nfs@...r.kernel.org, linux-unionfs@...r.kernel.org,
        linux-security-module@...r.kernel.org, selinux@...r.kernel.org,
        wangweiyang2@...wei.com, Casey Schaufler <casey@...aufler-ca.com>
Subject: Re: [PATCH -next 0/2] lsm: Change inode_setattr() to take struct

On 5/30/2023 7:28 AM, Christoph Hellwig wrote:
> On Tue, May 30, 2023 at 03:58:35PM +0200, Christian Brauner wrote:
>> The main concern which was expressed on other patchsets before is that
>> modifying inode operations to take struct path is not the way to go.
>> Passing struct path into individual filesystems is a clear layering
>> violation for most inode operations, sometimes downright not feasible,
>> and in general exposing struct vfsmount to filesystems is a hard no. At
>> least as far as I'm concerned.
> Agreed.  Passing struct path into random places is not how the VFS works.
>
>> So the best way to achieve the landlock goal might be to add new hooks
> What is "the landlock goal", and why does it matter?
>
>> or not. And we keep adding new LSMs without deprecating older ones (A
>> problem we also face in the fs layer.) and then they sit around but
>> still need to be taken into account when doing changes.
> Yes, I'm really worried about th amount of LSMs we have, and the weird
> things they do.

Which LSM(s) do you think ought to be deprecated? I only see one that I
might consider a candidate. As for weird behavior, that's what LSMs are
for, and the really weird ones proposed (e.g. pathname character set limitations)
(and excepting for BPF, of course) haven't gotten far.