linux-kernel - Re: [PATCH 02/28] ima: Align ima_post_path_mknod() definition with LSM infrastructure

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Date:   Mon, 6 Mar 2023 11:52:08 -0500
From:   Stefan Berger <stefanb@...ux.ibm.com>
To:     Roberto Sassu <roberto.sassu@...weicloud.com>,
        viro@...iv.linux.org.uk, chuck.lever@...cle.com,
        jlayton@...nel.org, zohar@...ux.ibm.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, brauner@...nel.org
Cc:     linux-fsdevel@...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, linux-kernel@...r.kernel.org,
        Roberto Sassu <roberto.sassu@...wei.com>
Subject: Re: [PATCH 02/28] ima: Align ima_post_path_mknod() definition with
 LSM infrastructure



On 3/3/23 13:18, Roberto Sassu wrote:
> From: Roberto Sassu <roberto.sassu@...wei.com>
> 
> Change ima_post_path_mknod() definition, so that it can be registered as
> implementation of the path_post_mknod hook.
> 
> Also, make sure that ima_post_path_mknod() is executed only if
> (mode & S_IFMT) is equal to zero or S_IFREG.
> 
> Add this check to take into account the different placement of the
> path_post_mknod hook (to be introduced) in do_mknodat(). Since the new hook
> will be placed after the switch(), the check ensures that
> ima_post_path_mknod() is invoked as originally intended when it is
> registered as implementation of path_post_mknod.

                 case 0: case S_IFREG:    <---- this here
                         error = vfs_create(mnt_userns, path.dentry->d_inode,
                                            dentry, mode, true);
                         if (!error)
                                 ima_post_path_mknod(mnt_userns, dentry);

> 
> Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>

Reviewed-by: Stefan Berger <stefanb@...ux.ibm.com>