Message-ID: <7bde74e6e5ccf24b2a2bd9dc2bbfcae5c424eac7.camel@huaweicloud.com>
Subject: Re: [PATCH 21/28] security: Introduce inode_post_remove_acl hook
From:   Roberto Sassu <roberto.sassu@huaweicloud.com>
To:     Stefan Berger <stefanb@linux.ibm.com>, viro@zeniv.linux.org.uk,
        chuck.lever@oracle.com, jlayton@kernel.org, zohar@linux.ibm.com,
        dmitry.kasatkin@gmail.com, paul@paul-moore.com, jmorris@namei.org,
        serge@hallyn.com, dhowells@redhat.com, jarkko@kernel.org,
        stephen.smalley.work@gmail.com, eparis@parisplace.org,
        casey@schaufler-ca.com, brauner@kernel.org
Cc:     linux-fsdevel@vger.kernel.org, linux-nfs@vger.kernel.org,
        linux-integrity@vger.kernel.org,
        linux-security-module@vger.kernel.org, keyrings@vger.kernel.org,
        selinux@vger.kernel.org, linux-kernel@vger.kernel.org,
        Roberto Sassu <roberto.sassu@huawei.com>
Date:   Mon, 06 Mar 2023 16:34:04 +0100
In-Reply-To: <6393eb31-5eb3-cb1c-feb7-2ab347703042@linux.ibm.com>
References: <20230303181842.1087717-1-roberto.sassu@huaweicloud.com>
         <20230303181842.1087717-22-roberto.sassu@huaweicloud.com>
         <6393eb31-5eb3-cb1c-feb7-2ab347703042@linux.ibm.com>
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On Mon, 2023-03-06 at 10:22 -0500, Stefan Berger wrote:
> 
> On 3/3/23 13:18, Roberto Sassu wrote:
> > From: Roberto Sassu <roberto.sassu@huawei.com>
> > 
> > In preparation for moving IMA and EVM to the LSM infrastructure, introduce
> > the inode_post_remove_acl hook.
> > 
> > Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
> > ---
> >   
> > +/**
> > + * security_inode_post_remove_acl() - Update inode sec after remove_acl op
> > + * @idmap: idmap of the mount
> > + * @dentry: file
> > + * @acl_name: acl name
> > + *
> > + * Update inode security field after successful remove_acl operation on @dentry
> > + * in @idmap. The posix acls are identified by @acl_name.
> > + */
> > +void security_inode_post_remove_acl(struct mnt_idmap *idmap,
> > +				    struct dentry *dentry, const char *acl_name)
> > +{
> > +	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
> > +		return;
> 
> Was that a mistake before that EVM and IMA functions did not filtered out private inodes?

Looks like that. At least for hooks that are not called from
security.c.

Thanks

Roberto