* Kees Cook <[email protected]> wrote:
> On Thu, Sep 24, 2015 at 1:26 PM, Stephen Smalley <[email protected]> wrote:
> > Hi,
> >
> > With the attached config and 4.3-rc2 on x86_64, I see the following in
> > /sys/kernel/debug/kernel_page_tables:
> > ...
> > ---[ High Kernel Mapping ]---
> > 0xffffffff80000000-0xffffffff81000000 16M
> > pmd
> > 0xffffffff81000000-0xffffffff81600000 6M ro PSE
> > GLB x pmd
> > 0xffffffff81600000-0xffffffff81775000 1492K ro
> > GLB x pte
> > 0xffffffff81775000-0xffffffff81800000 556K RW
> > GLB x pte
> > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Btw., I think we should run this lookup automatically in late bootup, if
CONFIG_X86_PTDUMP=y, and print a WARN()ing if there's any RWX permissions in
the
mappings.
That makes sure automated testing picks new bugs up.
Thanks,
Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
