linux-kernel - Re: [PATCH 2/2] x86/boot: increase maximum number of avoided KASLR regions

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Message-ID: <20190206175357.GG7314@zn.tnic>
Date:   Wed, 6 Feb 2019 18:53:57 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Kees Cook <keescook@...omium.org>
Cc:     Julian Stecklina <jsteckli@...zon.de>,
        Julian Stecklina <js@...en8.de>, X86 ML <x86@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        LKML <linux-kernel@...r.kernel.org>, jschoenh@...zon.de,
        Dave Jiang <dave.jiang@...el.com>, Baoquan He <bhe@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 2/2] x86/boot: increase maximum number of avoided KASLR
 regions

On Wed, Feb 06, 2019 at 03:29:06PM +0000, Kees Cook wrote:
> I'm fine adjusting all this to do things better. Ultimately, we're
> still walking two lists to process their intersection.

I'm wondering if we could start with a single range including all memory
and then keep exluding until we're done and then feed those remaining
ranges to slots_fetch_random(). So that mem_avoid[] is not needed
anymore.

Probably need to look for the devil in the detail first.

> Eh, it's just in the boot stub. ;)

They always say something like that. :-)

Thx.

-- 
Regards/Gruss,
    Boris.

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