linux-kernel - Re: [RFC PATCH 1/6] security/fbfam: Add a Kconfig to enable the fbfam feature

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Message-ID: <202009101615.8566BA3967@keescook>
Date:   Thu, 10 Sep 2020 16:18:08 -0700
From:   Kees Cook <keescook@...omium.org>
To:     kernel-hardening@...ts.openwall.com
Cc:     John Wood <john.wood@....com>,
        Matthew Wilcox <willy@...radead.org>,
        Jonathan Corbet <corbet@....net>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Iurii Zaikin <yzaikin@...gle.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-security-module@...r.kernel.org
Subject: Re: [RFC PATCH 1/6] security/fbfam: Add a Kconfig to enable the
 fbfam feature

On Thu, Sep 10, 2020 at 01:21:02PM -0700, Kees Cook wrote:
> From: John Wood <john.wood@....com>
> 
> Add a menu entry under "Security options" to enable the "Fork brute
> force attack mitigation" feature.
> 
> Signed-off-by: John Wood <john.wood@....com>
> ---
>  security/Kconfig       |  1 +
>  security/fbfam/Kconfig | 10 ++++++++++
>  2 files changed, 11 insertions(+)
>  create mode 100644 security/fbfam/Kconfig
> 
> diff --git a/security/Kconfig b/security/Kconfig
> index 7561f6f99f1d..00a90e25b8d5 100644
> --- a/security/Kconfig
> +++ b/security/Kconfig
> @@ -290,6 +290,7 @@ config LSM
>  	  If unsure, leave this as the default.
>  
>  source "security/Kconfig.hardening"
> +source "security/fbfam/Kconfig"

Given the layout you've chosen and the interface you've got, I think
this should just be treated like a regular LSM.

>  
>  endmenu
>  
> diff --git a/security/fbfam/Kconfig b/security/fbfam/Kconfig
> new file mode 100644
> index 000000000000..bbe7f6aad369
> --- /dev/null
> +++ b/security/fbfam/Kconfig
> @@ -0,0 +1,10 @@
> +# SPDX-License-Identifier: GPL-2.0
> +config FBFAM

To jump on the bikeshed: how about just calling this
FORK_BRUTE_FORCE_DETECTION or FORK_BRUTE, and the directory could be
"brute", etc. "fbfam" doesn't tell anyone anything.

-- 
Kees Cook