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

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Message-ID: <20161210123340.begeyyiegktangh2@pd.tnic>
Date:   Sat, 10 Dec 2016 13:33:41 +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 Sat, Dec 10, 2016 at 08:27:57PM +0800, Baoquan He wrote:
> Whether CONFIG_RANDOMIZE_BASE is yes or not, with 'nokaslr' specified,
> Kernel text mapping size should be 512M, just the same as no kaslr code
> compiled in.

"should be" still doesn't really explain what the problem is. What's
wrong with it remaining 1G?

IOW, something like "The problem is X and the issues it causes are Y.
That's why we need to do Z."

Now please replace X,Y and Z with the real content.

-- 
Regards/Gruss,
    Boris.

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