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Date: Wed, 19 Jul 2017 12:21:05 -0700
From: Kees Cook <keescook@...omium.org>
To: Christopher Lameter <cl@...ux.com>
Cc: Thomas Garnier <thgarnie@...gle.com>, Herbert Xu <herbert@...dor.apana.org.au>,
"David S . Miller" <davem@...emloft.net>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
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"kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>
Subject: Re: Re: x86: PIE support and option to extend
KASLR randomization
On Wed, Jul 19, 2017 at 7:08 AM, Christopher Lameter <cl@...ux.com> wrote:
> On Tue, 18 Jul 2017, Thomas Garnier wrote:
>
>> Performance/Size impact:
>> Hackbench (50% and 1600% loads):
>> - PIE enabled: 7% to 8% on half load, 10% on heavy load.
>> slab_test (average of 10 runs):
>> - PIE enabled: 3% to 4%
>> Kernbench (average of 10 Half and Optimal runs):
>> - PIE enabled: 5% to 6%
>>
>> Size of vmlinux (Ubuntu configuration):
>> File size:
>> - PIE disabled: 472928672 bytes (-0.000169% from baseline)
>> - PIE enabled: 216878461 bytes (-54.14% from baseline)
>
> Maybe we need something like CONFIG_PARANOIA so that we can determine at
> build time how much performance we want to sacrifice for performance?
>
> Its going to be difficult to understand what all these hardening config
> options do.
This kind of thing got discussed recently, and like
CONFIG_EXPERIMENTAL, a global config doesn't really work. The best
thing to do is to document each config as well as possible and system
builders can decide.
-Kees
--
Kees Cook
Pixel Security
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