linux-hardening - Re: [PATCH v10 10/15] FG-KASLR: use a scripted approach to handle .text.* sections

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Date:   Mon, 14 Feb 2022 13:30:53 +0100
From:   Alexander Lobakin <alexandr.lobakin@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Alexander Lobakin <alexandr.lobakin@...el.com>,
        linux-hardening@...r.kernel.org, x86@...nel.org,
        Borislav Petkov <bp@...en8.de>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Kristen Carlson Accardi <kristen@...ux.intel.com>,
        Kees Cook <keescook@...omium.org>,
        Miklos Szeredi <miklos@...redi.hu>,
        Ard Biesheuvel <ardb@...nel.org>,
        Tony Luck <tony.luck@...el.com>,
        Bruce Schlobohm <bruce.schlobohm@...el.com>,
        Jessica Yu <jeyu@...nel.org>,
        kernel test robot <lkp@...el.com>,
        Miroslav Benes <mbenes@...e.cz>,
        Evgenii Shatokhin <eshatokhin@...tuozzo.com>,
        Jonathan Corbet <corbet@....net>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>, Ingo Molnar <mingo@...hat.com>,
        Christoph Hellwig <hch@....de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
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        Arnd Bergmann <arnd@...db.de>,
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        Marios Pomonis <pomonis@...gle.com>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        "H.J. Lu" <hjl.tools@...il.com>, Nicolas Pitre <nico@...xnic.net>,
        linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        linux-arch@...r.kernel.org, live-patching@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH v10 10/15] FG-KASLR: use a scripted approach to handle .text.* sections

From: Peter Zijlstra <peterz@...radead.org>
Date: Mon, 14 Feb 2022 12:59:35 +0100

> On Mon, Feb 14, 2022 at 12:34:34PM +0100, Alexander Lobakin wrote:
> 
> > Re "won't do" -- sorry for trying to hijack this thread a bit, but
> > did I miss something? The last comments I've read were that LLVM
> > tools need to change their approach for CFI on x86, and Sami went
> > redo it, but I can't recall any "life-time" nacks.
> 
> Won't as in the lclang-cfi as it exists today. And I've understood that
> this CFI model is a keeper. It is true that Sami has been working on an
> alternative KCFI, but the little I can make of this proposal, it
> still needs serious work. Also see here:
> 
>   https://lkml.kernel.org/r/20220211133803.GV23216@worktop.programming.kicks-ass.net
> 
> Specifically, I object to the existence of any __*cfi_check_fail symbol
> on the grounds that it will bloat the code (and makes thinking about the
> whole speculation angle more painful than it needs to be).

Ah, I see, thanks! I've been tracking your IBT works, but missed
LKML thread for some reason.
I have no problems in dropping the related lines from my patch.

Al