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Message-ID: <3b440f064a1ae04d69f7e85f4077f8406c0eac67.camel@huaweicloud.com>
Subject: Re: [PATCH v9 13/25] security: Introduce file_release hook
From: Roberto Sassu <roberto.sassu@huaweicloud.com>
To: Al Viro <viro@zeniv.linux.org.uk>, casey@schaufler-ca.com
Cc: brauner@kernel.org, chuck.lever@oracle.com, jlayton@kernel.org,
 neilb@suse.de,  kolga@netapp.com, Dai.Ngo@oracle.com, tom@talpey.com,
 paul@paul-moore.com,  jmorris@namei.org, serge@hallyn.com,
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 dhowells@redhat.com,  jarkko@kernel.org, stephen.smalley.work@gmail.com,
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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>
Date: Tue, 16 Jan 2024 09:47:34 +0100
In-Reply-To: <20240115191508.GG1674809@ZenIV>
References: <20240115181809.885385-1-roberto.sassu@huaweicloud.com>
	 <20240115181809.885385-14-roberto.sassu@huaweicloud.com>
	 <20240115191508.GG1674809@ZenIV>
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On Mon, 2024-01-15 at 19:15 +0000, Al Viro wrote:
> On Mon, Jan 15, 2024 at 07:17:57PM +0100, Roberto Sassu wrote:
> > From: Roberto Sassu <roberto.sassu@huawei.com>
> >=20
> > In preparation for moving IMA and EVM to the LSM infrastructure, introd=
uce
> > the file_release hook.
> >=20
> > IMA calculates at file close the new digest of the file content and wri=
tes
> > it to security.ima, so that appraisal at next file access succeeds.
> >=20
> > An LSM could implement an exclusive access scheme for files, only allow=
ing
> > access to files that have no references.
>=20
> Elaborate that last part, please.

Apologies, I didn't understand that either. Casey?

Thanks

Roberto