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Date: Fri, 9 Feb 2024 11:17:07 +0100
From: Christian Brauner <brauner@kernel.org>
To: Roberto Sassu <roberto.sassu@huaweicloud.com>
Cc: viro@zeniv.linux.org.uk, chuck.lever@oracle.com, jlayton@kernel.org, 
	neilb@suse.de, kolga@netapp.com, Dai.Ngo@oracle.com, tom@talpey.com, 
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	dmitry.kasatkin@gmail.com, eric.snowberg@oracle.com, dhowells@redhat.com, jarkko@kernel.org, 
	stephen.smalley.work@gmail.com, eparis@parisplace.org, casey@schaufler-ca.com, shuah@kernel.org, 
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	linux-integrity@vger.kernel.org, keyrings@vger.kernel.org, selinux@vger.kernel.org, 
	linux-kselftest@vger.kernel.org, Roberto Sassu <roberto.sassu@huawei.com>, 
	Stefan Berger <stefanb@linux.ibm.com>
Subject: Re: [PATCH v9 11/25] security: Introduce inode_post_removexattr hook
Message-ID: <20240209-kostprobe-herzkammer-a05406383e80@brauner>
References: <20240115181809.885385-1-roberto.sassu@huaweicloud.com>
 <20240115181809.885385-12-roberto.sassu@huaweicloud.com>
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In-Reply-To: <20240115181809.885385-12-roberto.sassu@huaweicloud.com>

On Mon, Jan 15, 2024 at 07:17:55PM +0100, 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_removexattr hook.
> 
> At inode_removexattr hook, EVM verifies the file's existing HMAC value. At
> inode_post_removexattr, EVM re-calculates the file's HMAC with the passed
> xattr removed and other file metadata.
> 
> Other LSMs could similarly take some action after successful xattr removal.
> 
> The new hook cannot return an error and cannot cause the operation to be
> reverted.
> 
> Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
> Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
> Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
> Reviewed-by: Casey Schaufler <casey@schaufler-ca.com>
> ---
>  fs/xattr.c                    |  9 +++++----

Acked-by: Christian Brauner <brauner@kernel.org>