Message-ID: <52DE7EBD.1000908@zytor.com>
Date: Tue, 21 Jan 2014 06:05:49 -0800
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Ingo Molnar <mingo@kernel.org>
CC: Linus Torvalds <torvalds@linux-foundation.org>,
        Adrian Hunter <adrian.hunter@intel.com>,
        Arnaldo Carvalho de Melo <acme@infradead.org>,
        Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>, Cong Ding <dinggnu@gmail.com>,
        "H. Peter Anvin" <hpa@linux.intel.com>, Ingo Molnar <mingo@elte.hu>,
        Kees Cook <keescook@chromium.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Mathias Krause <minipli@googlemail.com>,
        Michael Davidson <md@google.com>, Thomas Gleixner <tglx@linutronix.de>,
        Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Subject: Re: [GIT PULL] x86/kaslr for v3.14
References: <201401201647.s0KGlZdh004167@tazenda.hos.anvin.org> <CA+55aFyxisSNKstMuanfrkhu5=2bxcu2cxZxMg38Zw0HAoXppg@mail.gmail.com> <CA+55aFyaf2B4Fo-dCJUJ=03aPVdLF7r4uMYNduYPMFwJQYngcA@mail.gmail.com> <20140121102700.GB2981@gmail.com> <52DE7C49.90503@zytor.com> <20140121140311.GB4537@gmail.com>
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On 01/21/2014 06:03 AM, Ingo Molnar wrote:
> 
> * H. Peter Anvin <hpa@zytor.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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