linux-kernel - Re: [GIT PULL] x86/kaslr for v3.14

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Message-ID: <52DE7EBD.1000908@zytor.com>
Date:	Tue, 21 Jan 2014 06:05:49 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ingo Molnar <mingo@...nel.org>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Cong Ding <dinggnu@...il.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Ingo Molnar <mingo@...e.hu>, Kees Cook <keescook@...omium.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Mathias Krause <minipli@...glemail.com>,
	Michael Davidson <md@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
Subject: Re: [GIT PULL] x86/kaslr for v3.14

On 01/21/2014 06:03 AM, Ingo Molnar wrote:
> 
> * H. Peter Anvin <hpa@...or.com> wrote:
> 
>> On 01/21/2014 02:27 AM, Ingo Molnar wrote:
>>>
>>> Hm, live annotation of the kernel image is a relatively new perf 
>>> feature, and KASLR predated that (by years) - which would at least in 
>>> part explain why it went unnoticed. (Although it does not excuse the 
>>> lack of testing.)
>>
>> kASLR is new, but on 32 bits we have relocated the kernel for a long 
>> time. [...]
> 
> I doubt many people develop on 32-bit x86, and the group of people 
> looking at annotated 32-bit assembly kernel profiles ought to be 
> another order of magnitude smaller than that ...
> 

Yes... I was commenting on the statement that "kASLR predated that by
years".  It hasn't been common.

	-hpa

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