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Message-ID: <5727CE13.6090308@linux.intel.com>
Date: Mon, 2 May 2016 15:00:51 -0700
From: Dave Hansen <dave.hansen@...ux.intel.com>
To: Thomas Garnier <thgarnie@...gle.com>, "H . Peter Anvin" <hpa@...or.com>,
Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
Borislav Petkov <bp@...e.de>, Andy Lutomirski <luto@...nel.org>,
Dmitry Vyukov <dvyukov@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>,
Dan Williams <dan.j.williams@...el.com>, Kees Cook <keescook@...omium.org>,
Stephen Smalley <sds@...ho.nsa.gov>, Kefeng Wang
<wangkefeng.wang@...wei.com>, Jonathan Corbet <corbet@....net>,
Matt Fleming <matt@...eblueprint.co.uk>, Toshi Kani <toshi.kani@....com>,
Alexander Kuleshov <kuleshovmail@...il.com>,
Alexander Popov <alpopov@...ecurity.com>, Joerg Roedel <jroedel@...e.de>,
Dave Young <dyoung@...hat.com>, Baoquan He <bhe@...hat.com>,
Mark Salter <msalter@...hat.com>,
Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
gthelen@...gle.com, kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH v2 3/4] x86, boot: Implement ASLR for kernel memory
sections (x86_64)
On 05/02/2016 02:41 PM, Thomas Garnier wrote:
> -#define __PAGE_OFFSET _AC(0xffff880000000000, UL)
> +#define __PAGE_OFFSET_BASE _AC(0xffff880000000000, UL)
> +#ifdef CONFIG_RANDOMIZE_MEMORY
> +#define __PAGE_OFFSET page_offset_base
> +#else
> +#define __PAGE_OFFSET __PAGE_OFFSET_BASE
> +#endif /* CONFIG_RANDOMIZE_MEMORY */
Do you have any data about the performance impact of this change? It's
not necessary to have it to merge something like this, I'm just curious
how bad it is.
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