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

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Message-ID: <52DE8231.6080408@zytor.com>
Date:	Tue, 21 Jan 2014 06:20:33 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Peter Zijlstra <peterz@...radead.org>
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 01/21/2014 01:00 AM, Peter Zijlstra wrote:
>>
>> So this is presumably something that needs to be fixed in perf?
> 
> Where do we learn about the offset from userspace?
> 

Now this is tricky... if this offset is too easy to get it completely
defeats kASLR.  On the other hand, I presume that if we are exporting
/proc/kcore we're not secure anyway.  Kees, I assume that in "secure"
mode perf annotations simply wouldn't work anyway?

	-hpa

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