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

[Kees Cook]

On Fri, Mar 14, 2014 at 12:41 PM, Linus Torvalds
<torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
> On Fri, Mar 14, 2014 at 12:32 PM, Linus Torvalds
> <torvalds@xxxxxxxxxxxxxxxxxxxx> 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 ;)

My weak preference would be to allow to build without that hard
requirement (citing imagined space savings, blah blah). But since
everything I normally use has KALLSYMS, I wouldn't object to doing it
either. :)

-Kees

-- 
Kees Cook
Chrome OS Security
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