linux-kernel - Re: [PATCH] hardening: Provide Kconfig fragments for basic options

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Message-ID: <87ledpcc92.fsf@gentoo.org>
Date:   Sat, 02 Sep 2023 07:35:07 +0100
From:   Sam James <sam@...too.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Salvatore Mesoraca <s.mesoraca16@...il.com>, x86@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org, kernel@...too.org
Subject: Re: [PATCH] hardening: Provide Kconfig fragments for basic options


Kees Cook <keescook@...omium.org> writes:

> Inspired by Salvatore Mesoraca's earlier[1] efforts to provide some
> in-tree guidance for kernel hardening Kconfig options, add a new fragment
> named "hardening-basic.config" (along with some arch-specific fragments)
> that enable a basic set of kernel hardening options that have the least
> (or no) performance impact and remove a reasonable set of legacy APIs.
>
> Using this fragment is as simple as running "make hardening.config".
>
> More extreme fragments can be added[2] in the future to cover all the
> recognized hardening options, and more per-architecture files can be
> added too.
>
> For now, document the fragments directly via comments. Perhaps .rst
> documentation can be generated from them in the future (rather than the
> other way around).
>

This is likely to make life a bit easier for us downstream in Gentoo,
where we currently supply a patch for KSPP:
https://gitweb.gentoo.org/proj/linux-patches.git/tree/4567_distro-Gentoo-Kconfig.patch?h=6.4#n237.

> [1] https://lore.kernel.org/kernel-hardening/1536516257-30871-1-git-send-email-s.mesoraca16@gmail.com/
> [2] https://github.com/KSPP/linux/issues/14

best,
sam