linux-kernel - Re: [PATCH v10 26/27] ima: Limit number of policy rules in non-init_ima

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Message-ID: <57237fc5-cb48-3286-4148-76a6b3c8efd3@linux.ibm.com>
Date:   Wed, 23 Feb 2022 16:06:39 -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
Subject: Re: [PATCH v10 26/27] ima: Limit number of policy rules in
 non-init_ima_ns


On 2/23/22 15:59, Mimi Zohar wrote:
> On Wed, 2022-02-23 at 15:45 -0500, Stefan Berger wrote:
>
>> avoid huge kernel memory consumption in the case that a cgroup limit for
>> memory was not set up.
> Ok, that is the motivation for the this patch.
>
Any user can create several user namespaces and with that several IMA 
namespaces and now we want to limit the number of rules inside an IMA 
namespace to limit the amount of kernel memory the policy rules are 
consuming. It isn't necessarily  related to cgroups but a hard limit on 
the number of rules to avoid wasted of memory.