linux-kernel - Re: [PATCH v2 2/2] x86/KASLR/64: Determine kernel text mapping size at runtime

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Message-ID: <20161210103151.56d7k2iwwwu5acmw@pd.tnic>
Date:   Sat, 10 Dec 2016 11:31:51 +0100
From:   Borislav Petkov <bp@...e.de>
To:     Baoquan He <bhe@...hat.com>
Cc:     linux-kernel@...r.kernel.org, tglx@...utronix.de, hpa@...or.com,
        mingo@...hat.com, x86@...nel.org, keescook@...omium.org,
        yinghai@...nel.org, thgarnie@...gle.com, kuleshovmail@...il.com,
        luto@...nel.org, mcgrof@...nel.org, anderson@...hat.com,
        dyoung@...hat.com, xlpang@...hat.com
Subject: Re: [PATCH v2 2/2] x86/KASLR/64: Determine kernel text mapping size
 at runtime

On Fri, Dec 09, 2016 at 10:41:58PM +0800, Baoquan He wrote:
> X86 64 kernel takes KERNEL_IMAGE_SIZE as the kernel text mapping size,
> and it's fixed as compiling time, changing from 512M to 1G as long as
> CONFIG_RANDOMIZE_BASE is enabled, though people specify kernel option
> "nokaslr" explicitly.
> 
> This could be a wrong behaviour.

A bunch of changes just because "this could be a wrong behavior". I'm
not really persuaded.

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--