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

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Message-ID: <CA+55aFyEu4POnixwxFCt+a8-ZJYBK-tCrdAP1yYgCPXq8x3ANg@mail.gmail.com>
Date:	Fri, 14 Mar 2014 12:41:41 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Dave Jones <davej@...hat.com>, Kees Cook <keescook@...omium.org>,
	Linus Torvalds <torvalds@...ux-foundation.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 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> Hmm. Do you have CONFIG_KALLSYMS enabled?

Just to clarify. KALLSYMS is required to figure out the symbol
addresses on a kaslr system. There's no way to look them up in a
System.map file or the object file, since the addresses aren't going
to match.

Your symptoms really sound like you might not have KALLSYMS enabled.

I wonder if we have a "select KALLSYMS" as part of RANDOMIZE_BASE,
since you need it for debug messages too (random hex numbers aren't
too useful ;)

            Linus
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