linux-kernel - Re: [PATCH v2] x86/mm/KASLR: EFI region is mistakenly included into KASLR VA space for randomization

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Message-ID: <20170324093615.ac4gf5odamcdxjnw@pd.tnic>
Date:   Fri, 24 Mar 2017 10:36:15 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Dave Young <dyoung@...hat.com>, Baoquan He <bhe@...hat.com>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-efi@...r.kernel.org, Thomas Garnier <thgarnie@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Bhupesh Sharma <bhsharma@...hat.com>
Subject: Re: [PATCH v2] x86/mm/KASLR: EFI region is mistakenly included into
 KASLR VA space for randomization

On Fri, Mar 24, 2017 at 10:24:34AM +0100, Ingo Molnar wrote:
> Preserving virtual addresses for kexec is a red herring: the randomized offset 
> could be passed to the kexec-ed kernel just fine.

Not only that - kexec'ed kernel gets the addresses from sysfs so we can randomize.

-- 
Regards/Gruss,
    Boris.

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