linux-kernel - Re: [RFC] improve_stack: make stack dump output useful again

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Date:	Fri, 14 Mar 2014 16:08:46 -0400
From:	Dave Jones <davej@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Kees Cook <keescook@...omium.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] improve_stack: make stack dump output useful again

On Fri, Mar 14, 2014 at 12:32:23PM -0700, Linus Torvalds wrote:
 > On Fri, Mar 14, 2014 at 12:08 PM, Dave Jones <davej@...hat.com> wrote:
 > >
 > > ok, nokalsr makes it work too.
 > > Booting with that and using the perf binary from 3.14rc6 , I just see..
 > >
 > >   9.30%  [kernel]                      [k] 0xffffffffaf18e887
 > 
 > Hmm. Do you have CONFIG_KALLSYMS enabled?

$ grep KALLSYMS .config
CONFIG_KALLSYMS=y
CONFIG_KALLSYMS_ALL=y

mine looks like this.. http://codemonkey.org.uk/junk/kallsyms

 > I have CONFIG_RANDOMIZE_BASE=y and perf (both report and top) seems to
 > work fine for me (current git, not v3.14-rc6, but still)

yeah, on current now too.

CONFIG_RANDOMIZE_BASE=y
CONFIG_RANDOMIZE_BASE_MAX_OFFSET=0x40000000


	Dave

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