linux-kernel - Re: [RFC PATCH 08/11] x86: Add support for finer grained KASLR

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Date:   Thu, 06 Feb 2020 09:43:21 -0800
From:   Kristen Carlson Accardi <kristen@...ux.intel.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Kees Cook <keescook@...omium.org>, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        arjan@...ux.intel.com, rick.p.edgecombe@...el.com, x86@...nel.org,
        linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com
Subject: Re: [RFC PATCH 08/11] x86: Add support for finer grained KASLR

On Thu, 2020-02-06 at 18:35 +0100, Peter Zijlstra wrote:
> On Thu, Feb 06, 2020 at 09:25:01AM -0800, Kristen Carlson Accardi
> wrote:
> 
> > That's right - all of these tables that you mention had relocs and
> > thus
> > I did not have to do anything special for them. The orc_unwind_ip
> > tables get sorted during unwind_init(). 
> 
> No they're not:
> 
>   f14bf6a350df ("x86/unwind/orc: Remove boot-time ORC unwind tables
> sorting")
> 
> Or rather, it might be you're working on an old tree.

Doh! Ok, I can make a patch to add it back based on CONFIG_FG_KASLR, or
just do yet another resort at boot time.