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

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Date:	Mon, 20 Jan 2014 15:13:33 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Cong Ding <dinggnu@...il.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Ingo Molnar <mingo@...e.hu>, Ingo Molnar <mingo@...nel.org>,
	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 01/20/2014 03:12 PM, Linus Torvalds wrote:
> On Mon, Jan 20, 2014 at 2:54 PM, Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
>> So I pulled this, but one question:
> 
> .. oh, and since I decided to test it, and was looking for problems:
> enabling kaslr breaks "perf". The *profile* looks fine, but the
> disassembly doesn't work.
> 
> I'm not entirely surprised. I decided I wanted to test it for a
> reason, after all. So it's not unexpected, but perhaps people hadn't
> thought about it, and clearly hadn't tested it.
> 
> Kernel modules disassemble fine, so clearly perf knows about code that
> moves around, but apparently it gets surprised when the core vmlinux
> file disassembly doesn't match addresses.
> 

So this is presumably something that needs to be fixed in perf?

	-hpa


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