linux-hardening - Re: [PATCH 0/4] x86: Various clean-ups in support of FGKASLR

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Message-ID: <YXj4WbzoPfdOgBtQ@hirez.programming.kicks-ass.net>
Date:   Wed, 27 Oct 2021 08:57:29 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Borislav Petkov <bp@...e.de>, Josh Poimboeuf <jpoimboe@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Kristen Carlson Accardi <kristen@...ux.intel.com>,
        Tony Luck <tony.luck@...el.com>,
        Alexander Lobakin <alexandr.lobakin@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Arnd Bergmann <arnd@...db.de>, Joerg Roedel <jroedel@...e.de>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Jing Yangyang <jing.yangyang@....com.cn>,
        Abaci Robot <abaci@...ux.alibaba.com>,
        Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Miroslav Benes <mbenes@...e.cz>,
        "H. Nikolaus Schaller" <hns@...delico.com>,
        Fangrui Song <maskray@...gle.com>,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-arch@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH 0/4] x86: Various clean-ups in support of FGKASLR

On Wed, Oct 13, 2021 at 10:57:38AM -0700, Kees Cook wrote:
> Kees Cook (2):
>   x86/boot: Allow a "silent" kaslr random byte fetch
>   x86/boot/compressed: Avoid duplicate malloc() implementations
> 
> Kristen Carlson Accardi (2):
>   x86/tools/relocs: Support >64K section headers
>   vmlinux.lds.h: Have ORC lookup cover entire _etext - _stext
> 
>  arch/x86/boot/compressed/kaslr.c  |   4 --
>  arch/x86/boot/compressed/misc.c   |   3 +
>  arch/x86/boot/compressed/misc.h   |   2 +
>  arch/x86/lib/kaslr.c              |  18 ++++--
>  arch/x86/tools/relocs.c           | 103 ++++++++++++++++++++++--------
>  include/asm-generic/vmlinux.lds.h |   3 +-
>  include/linux/decompress/mm.h     |  12 +++-
>  7 files changed, 107 insertions(+), 38 deletions(-)

Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>

Boris, these are indeed all improvements to the status quo, irrespective
of future FGKASLR work. Do you want to take them, or should I stick them
in x86/core ?