linux-kernel - Re: [PATCH v6 1/8] security: Add LSM hook at the point where a task gets a fatal signal

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Message-ID: <202103171821.C851A2D189@keescook>
Date:   Wed, 17 Mar 2021 18:22:31 -0700
From:   Kees Cook <keescook@...omium.org>
To:     John Wood <john.wood@....com>
Cc:     Jann Horn <jannh@...gle.com>, Randy Dunlap <rdunlap@...radead.org>,
        Jonathan Corbet <corbet@....net>,
        James Morris <jmorris@...ei.org>,
        Shuah Khan <shuah@...nel.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andi Kleen <ak@...ux.intel.com>,
        kernel test robot <oliver.sang@...el.com>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        linux-kselftest@...r.kernel.org,
        kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH v6 1/8] security: Add LSM hook at the point where a task
 gets a fatal signal

On Sun, Mar 07, 2021 at 12:30:24PM +0100, John Wood wrote:
> Add a security hook that allows a LSM to be notified when a task gets a
> fatal signal. This patch is a previous step on the way to compute the
> task crash period by the "brute" LSM (linux security module to detect
> and mitigate fork brute force attack against vulnerable userspace
> processes).
> 
> Signed-off-by: John Wood <john.wood@....com>

I continue to really like that this entire thing can be done from an LSM
with just this one extra hook. :)

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook