* Kees Cook <keesc...@chromium.org> wrote:
> On Mon, Oct 14, 2013 at 11:04 PM, Ingo Molnar <mi...@kernel.org> wrote:
> >
> > * Kees Cook <keesc...@chromium.org> wrote:
> >
> >> On Mon, Oct 14, 2013 at 9:28 AM, H. Peter Anvin <h...@zytor.com> wrote:
> >> > On 10/14/2013 07:19 AM, H. Peter Anvin wrote:
> >> >> My guess is that the 95 addresses are randomized and the 82 address is
> >> >> an address which failed to relocate.
> >> >
> >> >> ffffffff82a04a58 is:
> >> >> ffffffff82a03000 t init_per_cpu__gdt_page
> >> >
> >> >
> >> > Specifically, it looks like the percpu stuff isn't getting set up
> >> > correctly.
> >>
> >> It wouldn't surprise me if there are even more percpu things to fix.
> >> It's the main area we've continued to trip over while working on this
> >> with various linkers. Which linker and version are you seeing this
> >> with?
> >
> > The failure I saw triggered with fairly modern userspace:
> >
> > GNU ld version 2.23.52.0.1-9.fc19 20130226
> >
> > gcc version 4.8.1 20130603 (Red Hat 4.8.1-1) (GCC)
>
> Can you try with the gold linker? When not using Gold, I can produce a
> similar crash with GNU ld ver 2.23.2 but not 2.22.
I'm not set up for Gold - but maybe others can try your experiment.
If you can see/reproduce the 2.23 crash then maybe that fix will work for
my testcase as well.
Thanks,
Ingo
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