linux-kernel - Re: [PATCH v6 03/17] ima: Namespace audit status flags

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Date:   Wed, 15 Dec 2021 16:15:55 -0500
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Stefan Berger <stefanb@...ux.ibm.com>,
        linux-integrity@...r.kernel.org
Cc:     serge@...lyn.com, christian.brauner@...ntu.com,
        containers@...ts.linux.dev, dmitry.kasatkin@...il.com,
        ebiederm@...ssion.com, krzysztof.struczynski@...wei.com,
        roberto.sassu@...wei.com, mpeters@...hat.com, lhinds@...hat.com,
        lsturman@...hat.com, puiterwi@...hat.com, jejb@...ux.ibm.com,
        jamjoom@...ibm.com, linux-kernel@...r.kernel.org,
        paul@...l-moore.com, rgb@...hat.com,
        linux-security-module@...r.kernel.org, jmorris@...ei.org,
        Mehmet Kayaalp <mkayaalp@...ux.vnet.ibm.com>
Subject: Re: [PATCH v6 03/17] ima: Namespace audit status flags

On Fri, 2021-12-10 at 14:47 -0500, Stefan Berger wrote:
> From: Mehmet Kayaalp <mkayaalp@...ux.vnet.ibm.com>
> 
> The iint cache stores whether the file is measured, appraised, audited
> etc. This patch moves the IMA_AUDITED flag into the per-namespace
> ns_status, enabling IMA audit mechanism to audit the same file each time
> it is accessed in a new namespace.
> 
> The ns_status is not looked up if the CONFIG_IMA_NS is disabled or if
> any of the IMA_NS_STATUS_ACTIONS (currently only IMA_AUDIT) is not
> enabled.

^none of the ... are enabled.

thanks,

Mimi

> 
> Read and write operations on the iint flags is replaced with function
> calls. For reading, iint_flags() returns the bitwise AND of iint->flags
> and ns_status->flags. The ns_status flags are masked with
> IMA_NS_STATUS_FLAGS (currently only IMA_AUDITED). Similarly
> set_iint_flags() only writes the masked portion to the ns_status flags,
> while the iint flags is set as before. The ns_status parameter added to
> ima_audit_measurement() is used with the above functions to query and
> set the ns_status flags.
>