From: Dave Hansen <dave.hansen@linux.intel.com>
To: Thomas Garnier <thgarnie@google.com>,
"H . Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@suse.de>,
Andy Lutomirski <luto@kernel.org>,
Dmitry Vyukov <dvyukov@google.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Dan Williams <dan.j.williams@intel.com>,
Kees Cook <keescook@chromium.org>,
Stephen Smalley <sds@tycho.nsa.gov>,
Kefeng Wang <wangkefeng.wang@huawei.com>,
Jonathan Corbet <corbet@lwn.net>,
Matt Fleming <matt@codeblueprint.co.uk>,
Toshi Kani <toshi.kani@hpe.com>,
Alexander Kuleshov <kuleshovmail@gmail.com>,
Alexander Popov <alpopov@ptsecurity.com>,
Joerg Roedel <jroedel@suse.de>, Dave Young <dyoung@redhat.com>,
Baoquan He <bhe@redhat.com>, Mark Salter <msalter@redhat.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org,
linux-doc@vger.kernel.org, gthelen@google.com,
kernel-hardening@lists.openwall.com
Subject: Re: [PATCH v2 3/4] x86, boot: Implement ASLR for kernel memory sections (x86_64)
Date: Mon, 2 May 2016 15:00:51 -0700 [thread overview]
Message-ID: <5727CE13.6090308@linux.intel.com> (raw)
In-Reply-To: <1462225276-106993-4-git-send-email-thgarnie@google.com>
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.
next prev parent reply other threads:[~2016-05-02 22:00 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-02 21:41 [PATCH v2 0/4] x86, boot: KASLR memory implementation Thomas Garnier
2016-05-02 21:41 ` [PATCH v2 1/4] x86, boot: Refactor KASLR entropy functions Thomas Garnier
2016-05-02 21:41 ` [PATCH v2 2/4] x86, boot: PUD VA support for physical mapping (x86_64) Thomas Garnier
2016-05-02 21:58 ` Dave Hansen
2016-05-03 10:05 ` Baoquan He
2016-05-03 15:08 ` Dave Hansen
2016-05-03 15:46 ` Thomas Garnier
2016-05-02 21:41 ` [PATCH v2 3/4] x86, boot: Implement ASLR for kernel memory sections (x86_64) Thomas Garnier
2016-05-02 22:00 ` Dave Hansen [this message]
2016-05-03 19:16 ` Thomas Garnier
2016-05-02 21:41 ` [PATCH v2 4/4] x86, boot: Memory hotplug support for KASLR memory randomization Thomas Garnier
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