linux-kernel - Re: [PATCH v1 0/2] Add destructor hook to LSM modules

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Date:   Fri, 10 Mar 2023 12:49:57 -0800
From:   Casey Schaufler <casey@...aufler-ca.com>
To:     Mirsad Goran Todorovac <mirsad.goran.todorovac@....hr>,
        linux-kernel@...r.kernel.org
Cc:     linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Thomas Weißschuh <linux@...ssschuh.net>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        Paul Moore <paul@...l-moore.com>,
        Christian Göttsche <cgzones@...glemail.com>,
        Mickaël Salaün <mic@...ikod.net>,
        Frederick Lawler <fred@...udflare.com>, casey@...aufler-ca.com
Subject: Re: [PATCH v1 0/2] Add destructor hook to LSM modules

On 3/10/2023 11:26 AM, Mirsad Goran Todorovac wrote:
> LSM security/integrity/iint.c had the case of kmem_cache_create() w/o a proper
> kmem_cache_destroy() destructor.

LSMs should be using the security blobs associated with system objects
rather than doing their own memory management.

>
> Introducing the release() hook would enable LSMs to release allocated resources
> on exit, and in proper order, rather than dying all together with kernel shutdown
> in an undefined order.
>
> Thanks,
> 	Mirsad
>
> ---
>  include/linux/lsm_hooks.h | 1 +
>  security/integrity/iint.c | 7 +++++++
>  2 files changed, 8 insertions(+)
>
> --
> Mirsad Goran Todorovac
> Sistem inženjer
> Grafički fakultet | Akademija likovnih umjetnosti
> Sveučilište u Zagrebu
>  
> System engineer
> Faculty of Graphic Arts | Academy of Fine Arts
> University of Zagreb, Republic of Croatia
> The European Union