linux-kernel - Re: [PATCH v3 02/25] ima: Align ima_post_path_mknod() definition with LSM infrastructure

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Message-ID: <893bc5837fea4395bfb19e35097810ec7e425917.camel@huaweicloud.com>
Date:   Fri, 13 Oct 2023 09:38:16 +0200
From:   Roberto Sassu <roberto.sassu@...weicloud.com>
To:     Mimi Zohar <zohar@...ux.ibm.com>, viro@...iv.linux.org.uk,
        brauner@...nel.org, chuck.lever@...cle.com, jlayton@...nel.org,
        neilb@...e.de, kolga@...app.com, Dai.Ngo@...cle.com,
        tom@...pey.com, dmitry.kasatkin@...il.com, paul@...l-moore.com,
        jmorris@...ei.org, serge@...lyn.com, dhowells@...hat.com,
        jarkko@...nel.org, stephen.smalley.work@...il.com,
        eparis@...isplace.org, casey@...aufler-ca.com
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-nfs@...r.kernel.org, linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
        selinux@...r.kernel.org, Roberto Sassu <roberto.sassu@...wei.com>
Subject: Re: [PATCH v3 02/25] ima: Align ima_post_path_mknod() definition
 with LSM infrastructure

On Thu, 2023-10-12 at 13:10 -0400, Mimi Zohar wrote:
> > > > > > We need to make sure that ima_post_path_mknod() has the
> > > > > > same parameters
> > > > > > as the LSM hook at the time we register it to the LSM
> > > > > > infrastructure.
> > > > > 
> > > > > I'm trying to understand why the pre hook parameters and the
> > > > > missing
> > > > > IMA parameter are used, as opposed to just defining the new
> > > > > post_path_mknod hook like IMA.
> > > > 
> > > > As an empyrical rule, I pass the same parameters as the
> > > > corresponding
> > > > pre hook (plus idmap, in this case). This is similar to the
> > > > inode_setxattr hook. But I can be wrong, if desired I can
> > > > reduce.
> > > 
> > > The inode_setxattr hook change example is legitimate, as EVM
> > > includes
> > > idmap, while IMA doesn't. 
> > > 
> > > Unless there is a good reason for the additional parameters, I'm
> > > not
> > > sure that adding them makes sense.  Not modifying the parameter
> > > list
> > > will reduce the size of this patch set.
> > 
> > The hook is going to be used by any LSM. Without knowing all the
> > possible use cases, maybe it is better to include more information
> > now,
> > than modifying the hook and respective implementations later.
> > 
> > (again, no problem to reduce)
> 
> Unless there is a known use case for a specific parameter, please
> minimize them.   Additional parameters can be added later as needed. 

Ok. I did the same for inode_post_create_tmpfile.

Thanks

Roberto