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

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Message-ID: <20140128170507.GA16279@gmail.com>
Date:	Tue, 28 Jan 2014 18:05:07 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Richard Weinberger <richard@....at>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Kees Cook <keescook@...omium.org>,
	Cong Ding <dinggnu@...il.com>, Ingo Molnar <mingo@...e.hu>,
	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


* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Tue, Jan 28, 2014 at 8:30 AM, H. Peter Anvin <hpa@...or.com> wrote:
> >
> > I don't think there is any way to not break anything... we're
> > introducing a new kind of object ("normalized kernel pointer") here.
> 
> I suspect we could just drop the addresses entirely if we have a 
> symbolic version. It's not like the hex addresses are all that 
> interesting, and in commit messages I actually end up editing them 
> out just because they are worthless noise.

Well, I often use the hex numbers to look them up and disassemble them 
in a vmlinux via gdb and 'list *0x1234123412341234' - where the 
vmlinux has no debuginfo. (Debuginfo takes longer to build so I 
generally build without it.)

I'm quite sure other kernel developers do that as well.

> So we could just do "schedule+0x45/0x368" without the actual hex 
> address in brackets..

AFAICS this won't work in a symbol-less vmlinux. Is there some trick 
to do it with gdb?

Thanks,

	Ingo
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