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

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Message-ID: <20140121090003.GO31570@twins.programming.kicks-ass.net>
Date:	Tue, 21 Jan 2014 10:00:03 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	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 Mon, Jan 20, 2014 at 03:13:33PM -0800, H. Peter Anvin wrote:
> 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?

Where do we learn about the offset from userspace?
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