linux-kernel - Re: [PATCH v5 7/8] Documentation: Add documentation for the Brute LSM

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Message-ID: <20210307151920.GR472138@tassilo.jf.intel.com>
Date:   Sun, 7 Mar 2021 07:19:20 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     John Wood <john.wood@....com>
Cc:     Kees Cook <keescook@...omium.org>, 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>,
        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 v5 7/8] Documentation: Add documentation for the Brute LSM

Sorry for the late answer. I somehow missed your email earlier.

> As a mitigation method, all the offending tasks involved in the attack are
> killed. Or in other words, all the tasks that share the same statistics
> (statistics showing a fast crash rate) are killed.

So systemd will just restart the network daemon and then the attack works
again?

Or if it's a interactive login you log in again.

I think it might be useful even with these limitations, but it would
be good to spell out the limitations of the method more clearly.

I suspect to be useful it'll likely need some user space configuration
changes too.

-Andi