linux-kernel - Re: [PATCH v2] use -fstack-protector-strong

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Message-ID: <52963223.9080701@zytor.com>
Date:	Wed, 27 Nov 2013 09:55:47 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ingo Molnar <mingo@...nel.org>, Kees Cook <keescook@...omium.org>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Ingo Molnar <mingo@...hat.com>,
	Russell King <linux@....linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	"x86@...nel.org" <x86@...nel.org>,
	Shawn Guo <shawn.guo@...aro.org>,
	Olof Johansson <olofj@...omium.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2] use -fstack-protector-strong

On 11/27/2013 09:54 AM, Ingo Molnar wrote:
>>
>> Looks to be 2% for defconfig. That's way better. Shall I send a v3?
> 
> Well, it's better than 9%, but still almost an order of magnitude 
> higher than the cost is today, and a lot of distros have 
> CONFIG_CC_STACKPROTECTOR=y.
> 
> So it would be nice to measure how much the instruction count goes up 
> in some realistic system-bound test. How much does something like 
> kernel/built-in.o increase, as per 'size' output?
> 

Do we need CONFIG_CC_STACKPROTECTOR_STRONG?

	-hpa


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