linux-kernel - Re: [PATCH v3 15/25] security: Introduce file_pre_free

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1e5ab7c0-5386-ba67-b400-88fde5f0c1c6@linux.ibm.com>
Date:   Tue, 5 Sep 2023 14:36:16 -0400
From:   Stefan Berger <stefanb@...ux.ibm.com>
To:     Roberto Sassu <roberto.sassu@...weicloud.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,
        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
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 15/25] security: Introduce file_pre_free_security hook


On 9/4/23 09:34, Roberto Sassu wrote:
> From: Roberto Sassu <roberto.sassu@...wei.com>
>
> In preparation for moving IMA and EVM to the LSM infrastructure, introduce
> the file_pre_free_security hook.
>
> It is useful for IMA to calculate the digest of the file content, just
> before a file descriptor is closed, and update the security.ima xattr with
> the new value.
>
> LSMs should use this hook instead of file_free_security, if they still need
> to access the opened file, before it is closed. The new hook cannot return
> an error and cannot cause the operation to be canceled.
>
> Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>

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