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

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Message-ID: <ffd4b877-389b-63b5-576d-f3ce66849ebf@linux.ibm.com>
Date:   Wed, 15 Dec 2021 21:38:45 -0500
From:   Stefan Berger <stefanb@...ux.ibm.com>
To:     Mimi Zohar <zohar@...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 12/15/21 16:15, Mimi Zohar wrote:
> 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.

You want me to rephrase it?


>
> 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.
>>