linux-kernel - Re: [kernel-hardening] Re: [PATCH RFC v2 1/3] LSM: Allow per LSM module per "struct task

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Message-ID: <CAGXu5jJAxdtdPuOZVquuajAeR4sbSiFoD4-QUMmcC_RLZy5tfw@mail.gmail.com>
Date:   Tue, 11 Apr 2017 12:57:58 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Casey Schaufler <casey@...aufler-ca.com>
Cc:     Djalal Harouni <tixxdz@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>,
        LSM List <linux-security-module@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>,
        Dongsu Park <dpark@...teo.net>,
        James Morris <james.l.morris@...cle.com>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Paul Moore <paul@...l-moore.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [kernel-hardening] Re: [PATCH RFC v2 1/3] LSM: Allow per LSM
 module per "struct task_struct" blob.

On Tue, Apr 11, 2017 at 12:54 PM, Casey Schaufler
<casey@...aufler-ca.com> wrote:
> On 4/10/2017 9:43 PM, Kees Cook wrote:
>> On Mon, Apr 10, 2017 at 1:00 PM, Djalal Harouni <tixxdz@...il.com> wrote:
>>> On Mon, Apr 10, 2017 at 9:26 PM, Casey Schaufler <casey@...aufler-ca.com> wrote:
>>>> I think that would be the prudent approach. There is still
>>>> the possibility that blob sharing (or full stacking, if you
>>>> prefer) won't be accepted any time soon.
>>> Ok Casey! I will wait for more feedback, and if other maintainers do
>>> not object, I will convert it back to rhashtables in next iterations
>>> making sure that it should be simple to convert later to a blob
>>> sharing mechanism.
>> Would it be possible just to add a single field to task_struct if this
>> LSM is built in? I feel like rhashtables is a huge overhead when a
>> single field is all that's needed.
>
> Special casing the task_struct based on which modules
> are compiled in would work, but I'm under the impression
> that there's a strong desire to keep to one pointer for
> security module information in the major structures.

Right, I meant as far as keeping this patch set unblocked by the other one...

-Kees

-- 
Kees Cook
Pixel Security